阅读说明：本技术 具有提高的安全性的电池模块、包括该电池模块的电池组和包括该电池组的车辆 (The battery module of safety with raising, the battery pack including the battery module and the vehicle including the battery pack ) 是由 金京旼 吴松泽 崔正锡 于 2018-10-08 设计创作，主要内容包括：给电池模块的引线连接部分设置安全元件,以在过充电的情况下提高电池模块的安全性。根据本公开内容的电池模块包括两个或更多个电池单元,并且所述电池模块包括电流切断电池单元,所述电流切断电池单元将相邻的第一电池单元和第二电池单元电连接,并且在发生过充电时,所述电流切断电池单元破裂(rupture)以断开电连接。(Set up separately to the wire connections of battery module and set safety element, to improve the safety of battery module in the case where overcharge.Battery module according to present disclosure includes two or more battery units, and the battery module includes failure of current battery unit, the first adjacent battery unit and the second battery unit are electrically connected by the failure of current battery unit, and when overcharge occurs, the failure of current battery unit rupture (rupture) is to disconnect electrical connection.)

1. a kind of battery module including two or more battery units, the battery module include:

Failure of current battery unit, the failure of current battery unit are electric by the first adjacent battery unit and the second battery unit Connection, and when overcharge occurs, the failure of current battery unit rupture (rupture) is to disconnect electrical connection.

2. battery module according to claim 1, wherein first battery unit, second battery unit and described Each of failure of current battery unit is the bag type secondary battery having following structure: electrode assembly and electrolysis with both ends Matter solution is accommodated in together in bag shell and the bag shell is sealed in a gastight manner, and the both ends are connected to polarity phase One end of anti-each contact conductor, and the other end of the contact conductor is exposed to the outside of the bag shell.

3. battery module according to claim 1, wherein first battery unit and the failure of current battery unit It is connected in series, and the failure of current battery unit is connected with second battery cells in series.

4. battery module according to claim 2, wherein the contact conductor of first battery unit and second electricity The contact conductor of pool unit is connected to each other by the contact conductor of the failure of current battery unit.

5. battery module according to claim 4, wherein first battery unit and second battery unit are to hand over It is stacked for mode, so that each contact conductor has opposite polarity, the other end of the contact conductor of first battery unit With the other end of the contact conductor of second battery unit along stacking direction it is facing with each other bend, and the electric current is cut Power-off pool unit is parallel to the stacking direction and is placed between the bending part of each contact conductor, by each contact conductor Connection.

6. battery module according to claim 5, wherein the failure of current battery unit is than first battery unit It is smaller or thinner with second battery unit, so that the bending of each contact conductor is arranged in the failure of current battery unit Between part, without influencing the distance between first battery unit and second battery unit.

7. battery module according to claim 2, wherein the failure of current battery unit is due in overcharge Pressure increase caused by the gas generated in the battery unit and rupture.

8. battery module according to claim 7, wherein the failure of current battery unit includes and electrolyte solution one The electrode assembly being contained in bag shell is acted, wherein the electrode assembly has the lamination of negative plate, diaphragm and positive plate, and The bag shell is sealed in a gastight manner,

The positive plate includes:

Plus plate current-collecting body；With

The anode active material layer being formed on the plus plate current-collecting body, and

The anode active material layer includes positive electrode active materials, gas generating material, conductive material and adhesive.

9. battery module according to claim 8, wherein the gas generating material is selected from by lithium carbonate (Li₂CO₃)、 Calcium carbonate (CaCO₃), lithium nickel oxide (LNO:Lithium Nickel Oxide) and lithium oxalate (Lithium oxalate) structure At one of group or their mixture.

10. battery module according to claim 8, wherein being based on the positive electrode active materials and the gas generating material Total weight, the gas generating material is included in the positive plate with the amount of 0.1 weight % to 20 weight %.

11. battery module according to claim 8, wherein the gas generating material is using described adhesive bonding and admittedly It is fixed, and hole is formed due to the gap between the gas generating material.

12. battery module according to claim 8, wherein the positive electrode active materials and gas generating material mixing Together.

13. battery module according to claim 8, wherein the anode active material layer includes prime coat and active material Coating,

The prime coat includes the gas generating material, the conductive material and described adhesive, and

The active material coating includes the positive electrode active materials, the conductive material and described adhesive.

14. battery module according to claim 13, wherein the gas generating material is with the solid in the prime coat 90 weight % to 99.9 weight % amount exist.

15. battery module according to claim 2, wherein the contact conductor of first battery unit or second electricity The contact conductor of pool unit is made of bimetallic,

The bimetallic is the lamination with the metal and the metal with low thermal coefficient of expansion of high thermal expansion coefficient,

The metal with high thermal expansion coefficient in conjunction with the contact conductor of the failure of current battery unit, and

One end of the metal with high thermal expansion coefficient is attached to the failure of current battery unit by attaching components The bag shell.

16. a kind of battery pack, comprising:

At least one is according to claim 1 to battery module described in any one of 15；With

Encapsulate the battery housing of at least one battery module.

17. a kind of vehicle, comprising:

At least one battery pack according to claim 16.

Technical field

This disclosure relates to a kind of battery modules, and electric current stream is cut off in overcharge more particularly, to one kind Dynamic battery module.In addition, this disclosure relates to a kind of battery pack including the battery module and including the vehicle of the battery pack .This application claims the South Korea patent application the 10-2017-0157433rd submitted on November 23rd, 2017 in South Korea and in South Korea patent application the 10-2018-0099235th priority submitted in South Korea on the 24th of August in 2018, will be upper by reference The disclosure for stating patent application combines herein.

Background technique

Currently, commercially available secondary cell includes nickel-cadmium cell, nickel-metal hydride battery, nickel-zinc cell, lithium secondary battery etc., wherein Lithium secondary battery seldom with or without memory effect, therefore lithium secondary battery because of charge and discharge freely, self-discharge rate it is extremely low and The high advantage of energy density and more attract attention than Ni-based secondary cell.

For positive electrode active materials and negative electrode active material, lithium secondary battery mainly uses lithium base oxide and carbon materials respectively Material.Lithium secondary battery includes: the electrode assembly for being assembled with element cell, and each element cell includes having to be coated with positive-active The positive plate of the plus plate current-collecting body of material, be coated with negative electrode active material negative current collector negative plate and between Diaphragm between positive plate and negative plate；And encapsulating material, i.e., the battery case sealed in a gastight manner, electrode assembly and electricity Electrolyte solution is accommodated in encapsulating material together.

According to the shape of battery case, lithium secondary battery is divided into the can type secondary battery that electrode assembly is built in metal can The bag type secondary battery being built in electrode assembly in the bag of aluminum-laminated sheets.

Recently, secondary cell is not only widely used in the midget plant of such as portable electronic product etc, but also wide It is general in the medium-sized and large-scale plant of such as vehicle and energy-storage system (ESS) etc.In order to be used in medium-sized and large-scale plant, Multiple secondary cells are electrically connected to construct battery module or battery pack, to increase capacity and output.In particular, pouch-type two Primary cell because be easy to stack and it is light-weight due to be widely used in medium-sized and large-scale plant.

There is bag type secondary battery the electrode assembly for being wherein connected with contact conductor to be accommodated in together with electrolyte solution In bag shell, and the structure that bag shell is sealed in a gastight manner.A part of contact conductor is exposed to the outside of bag shell, And the contact conductor of exposure is electrically connected to the device for being equipped with the secondary cell, or for secondary cell to be electrically connected each other It connects.

Fig. 1 and Fig. 2 is the view for showing two bag type secondary batteries being for example connected in series in conventional battery modules.

As shown in the figure, bag type secondary battery 10 includes the contact conductor 40 stretched out except bag shell 30.Contact conductor 40 It is divided into positive (+) lead and cathode (-) lead according to electric polarity, and is electrically connected to is contained in bag shell 30 in a gastight manner Electrode assembly 20.That is, positive wire is electrically coupled to the positive plate of electrode assembly 20, negative wire is electrically coupled to electrode The negative plate of component 20.

A variety of methods that bag type secondary battery 10 is connected in series may be present, Fig. 1, which is shown, bends contact conductor 40, and And using connection strap 50 welded the contact conductor 40 of bending, contact conductor 40 is connected, Fig. 2 shows the electrodes in bending They are attached by welding in the case where having overlapping between lead 40.The direct of method or Fig. 2 is indirectly connected in Fig. 1 Multiple pouch-type two in connection method, when the coupling part of contact conductor 40, which is referred to as wire connections, divides A, in battery module Primary cell 10 can divide A to be connected to each other by wire connections.

Meanwhile the abnormal feelings for needing to protect secondary cell from such as overcharge, overdischarge, overheat and overcurrent etc Condition, and usually secondary battery protection circuit is realized together in battery module or battery pack.In particular, in order to meet secondary electricity The higher energy density in pond and lower cost and with high capacity active material, thin separators (thin separator) and height The technology development of voltage operation, overcharge become problem, and the kindling and explosion issues in the case of solution overcharge are necessary.Separately Outside, since lithium secondary battery uses inflammable organic solvent, when lithium secondary battery is in exceptional condition due to overcharge When must assure that safety.

However, conventional wire connections divide the path (path) of A only electric current flowing.For example, its with ensure have There is the function of the safety of the battery module of this connection structure unrelated.As described above, conventional wire connections divide A overcharging Do not have safety element in electric situation, thus, for example, the overcharge when secondary battery protection circuit prevents function cannot normal work When making, safety is excessively poor.

The maximum social concern in secondary cell field is safety problem at present.The explosion of battery module or battery pack can be to making It is damaged with their electronic device or vehicle, and leads to user security threat and fire, therefore safety problem is considered It is important problem.When secondary cell overcharge, the risk of explosion and/or kindling increases, and burns suddenly caused by overcharge Or explosion can lead to casualties and property loss.Therefore, it is necessary to be introduced into a kind of safety substantially ensured in secondary cell use The equipment of property.

Summary of the invention

Technical problem

Present disclosure be intended to provide it is a kind of wherein set up separately to the wire connections of battery module set safety element and in mistake There is battery module, the battery pack including the battery module and the vehicle including the battery pack of the safety improved under charging situation .

By the way that the these and other objects and advantages it will be understood that present disclosure are described below, and will be from present disclosure Embodiment become apparent.In addition, it will be readily understood that, the objects and advantages of present disclosure pass through appended right Means and combinations thereof described in it is required that are realized.

Technical solution

Battery module according to present disclosure includes two or more battery units, and the battery module includes Adjacent the first battery unit and the second battery unit are electrically connected by failure of current battery unit, the failure of current battery unit It connects, and when overcharge occurs, the failure of current battery unit rupture (rupture) is to disconnect electrical connection.

In this disclosure, first battery unit, second battery unit and the failure of current battery list Each of member can be the bag type secondary battery having following structure: the electrode assembly with both ends is together with electrolyte solution It is accommodated in bag shell and the bag shell is sealed in a gastight manner, the both ends are connected to opposite polarity each electricity One end of pole lead, and the other end of the contact conductor is exposed to the outside of the bag shell.

In this disclosure, first battery unit and the failure of current battery unit can be connected in series, and The failure of current battery unit and second battery unit can be connected in series.

The contact conductor of the contact conductor of first battery unit and second battery unit can pass through the electric current The contact conductor of cutting battery unit is connected to each other.

Preferably, first battery unit and second battery unit stack in an alternating manner, so that each electrode Lead has opposite polarity, the electrode of the other end of the contact conductor of first battery unit and second battery unit The other end of lead is bent facing with each otherly along stacking direction, and the failure of current battery unit is parallel to the stacking Direction is placed between the bending part of each contact conductor, and each contact conductor is connected.

Preferably, the failure of current battery unit it is smaller than first battery unit and second battery unit or It is thinner, so that the failure of current battery unit is arranged between the bending part of each contact conductor, without influencing described the The distance between one battery unit and second battery unit.

Preferably, the failure of current battery unit is due to the gas that generates in the battery unit in overcharge Pressure increase caused by body and rupture.

For this purpose, the failure of current battery unit may include the electrode group being contained in bag shell together with electrolyte solution Part, wherein the electrode assembly has the lamination of negative plate, diaphragm and positive plate, and the bag shell is close in a gastight manner Envelope, the positive plate may include plus plate current-collecting body and the anode active material layer that is formed on the plus plate current-collecting body, and institute Stating anode active material layer may include positive electrode active materials, gas generating material, conductive material and adhesive.

The gas generating material can be selected from by lithium carbonate (Li₂CO₃), calcium carbonate (CaCO₃), lithium nickel oxide One of group that (LNO:Lithium Nickel Oxide) and lithium oxalate (Lithium oxalate) are constituted or they Mixture.

Total weight based on the positive electrode active materials and the gas generating material, the gas generating material can be with The amount of 0.1 weight % to 20 weight % are included in the positive plate.

The anode active material layer can be the wherein gas generating material and bond and fix using described adhesive, And the porous structure of hole is formed due to the gap between the gas generating material.

The positive electrode active materials and the gas generating material can mix.

Alternatively, the anode active material layer may include prime coat and active material coating, the prime coat may include institute Gas generating material, the conductive material and described adhesive are stated, the active material coating may include the positive-active material Material, the conductive material and described adhesive.

The gas generating material can be deposited with the amount of 90 weight % to the 99.9 weight % of the solid in the prime coat In.

It can be in first battery unit or the contact conductor or the failure of current battery of second battery unit Bimetallic is used in the contact conductor of unit, so that contact conductor can be bent in overcharge because temperature increases, and The bag shell of the failure of current battery unit can be damaged and be ruptured.

In addition, this disclosure provides a kind of battery pack, including at least one according to the battery module of present disclosure, And encapsulate the battery housing of at least one battery module.

In addition, this disclosure provides a kind of vehicle, including at least one according to the battery pack of present disclosure.

Beneficial effect

According to present disclosure, battery module includes the failure of current battery unit between adjacent cell, because This is more than threshold value when the voltage of overcharge and failure of current battery unit occurs when using battery module, for example, specific electricity When pressure, failure of current battery unit rupture, to cut off electric current flowing.Therefore, even if secondary battery protection circuit does not work, also can Electric current flowing is cut off, to stop charging, to increase the safety of battery module.As described above, the battery mould of present disclosure Block realizes the means for automatically cutting off electric current flowing using failure of current battery unit in overcharge, therefore, in addition to two The overcharge of primary cell protection circuit prevents except function, dual can ensure the safety of battery module.

According to present disclosure, it is possible to provide a kind of battery module, the battery module include electricity between adjacent cell Stream cutting battery unit is connected in series with establishing, to form electrical communication path.When overcharge occurs, such as reach specific electricity When the case where pressure, the gas generating material for including in the positive plate of failure of current battery unit generates gas.Failure of current battery Unit can be sufficiently small or thin, so that it may be provided between adjacent cell, and is easy to due to the gas wherein generated Rupture.As a result, the electrical connection of adjacent cell is disconnected, electric current flowing is cut off, so that it is guaranteed that the safety of battery module.

According to present disclosure, the wire connections point of battery module have safety element or failure of current battery unit. Safety element is not current interrupt device (CID, Current Interrupt Device) the type connector or molten of simple structure The fuse of change, " battery unit " type failure of current battery unit is for safely cutting off electric current when overcharge situation occurs. Compared with connector or fuse, failure of current battery unit is advantageous in resistance.

It, can be only by the way that failure of current battery unit be added to wire connections point without changing electricity according to present disclosure The battery unit of pond module increases safety.Without changing existing battery unit, for example, the installation insurance in contact conductor Silk.In addition, the failure of current principle of present disclosure is not intended to the contact conductor for the battery unit that destruction or fusing are connected.Only The rupture of failure of current battery unit is electrically connected to disconnect.The major advantage for not changing the battery unit of battery module is battery module Batch production or battery unit on resistance do not change.

In particular, by control failure of current battery unit positive plate in include gas generating material in specific electricity Pressure cutting electric current, can cope with " overcharge " situation, rather than overdischarge or overcurrent situations.For example, making using lithium carbonate In the case where for gas generating material, when the voltage of failure of current battery unit reaches 4.8V due to overcharge, Li₂CO₃Point Solution is CO+CO₂Gas and internal pressure increases sharply, therefore failure of current battery unit is rupturable.

As described above, set up separately in the case where overcharge to wire connections according to present disclosure and set safety element, from And improve the safety of battery module, the battery pack including the battery module and the vehicle including the battery pack.

Detailed description of the invention

Attached drawing illustrates the preferred embodiment of present disclosure and is used for offer pair together with following detailed description The technical aspect of present disclosure is further understood, and therefore, present disclosure should not be construed as limited to attached drawing.

Fig. 1 and Fig. 2 is the view for showing two bag type secondary batteries being for example connected in series in conventional battery modules.

Fig. 3 is the schematic diagram for showing the battery module according to one embodiment of present disclosure.

Fig. 4 is the schematic diagram for showing the battery module according to another embodiment of present disclosure.

Fig. 5 is the top view of the bag type secondary battery for the unit cells unit for including in the battery module as Fig. 4.

Fig. 6 is the top view for the failure of current battery unit for including in the battery module of Fig. 4.

Fig. 7 is the two neighboring battery list for showing wherein failure of current battery unit and being attached in the battery module of Fig. 4 The schematic diagram of embodiment between member.

Fig. 8 is the embodiment of the positive plate in the electrode assembly for including in the failure of current battery unit for show Fig. 6 Sectional view.

Fig. 9 is another embodiment party of the positive plate in the electrode assembly for including in the failure of current battery unit for show Fig. 6 The sectional view of formula.

Figure 10 is another embodiment shown according to present disclosure, and wherein failure of current battery unit is connected to adjacent The schematic diagram of embodiment between two battery units.

Figure 11 is the curve graph for showing the overcharge test result according to present disclosure test example.

Figure 12 is the view for showing the battery pack according to one embodiment of present disclosure.

Figure 13 is the view for showing the vehicle according to one embodiment of present disclosure.

Specific embodiment

Hereinafter, it will be described in detail with reference to the accompanying drawings the preferred embodiment of present disclosure.Before describing, it should manage It solving, term or word used in specification and appended should not be construed as limited to general sense and dictionary meanings, But on the basis of allowing inventor's best interpretations and suitably define the principle of term, based on corresponding to present disclosure The meaning and concept of technical aspect explain.

Therefore, embodiment described herein and diagram shown in the drawings are only the most preferably implementation of present disclosure Mode, it is not intended that the technical aspect of present disclosure is fully described, therefore it should be understood that can be to it when submitting application Make other equivalent and modifications.In the accompanying drawings, similar appended drawing reference indicates similar element.

In embodiments described below, secondary cell refers to lithium secondary battery.Here, lithium secondary battery is referred to as it During charging and discharging lithium ion serve as work ion, the secondary electricity of electrochemical reaction is caused at positive plate and negative plate Pond.

In addition, the title electrolyte or diaphragm according to used in lithium secondary battery even if secondary cell should be construed to Type, the type of battery case for encapsulating secondary cell and the internal or external structure of lithium secondary battery and change, still Lithium secondary battery covers any secondary cell for using lithium ion as work ion.

Present disclosure applies also for other secondary cells in addition to lithium secondary battery.Therefore, it should be construed as this Disclosure cover although work ion be not lithium ion can using present disclosure technical aspect any kind of two Primary cell.

Fig. 3 is the schematic diagram for showing the battery module according to one embodiment of present disclosure.

Referring to Fig. 3, battery module 100 includes two or more battery units 60a, 60b, 60c ....Each battery list First 60a, 60b, 60c ... it can be secondary cell.Each battery unit 60a, 60b, 60c ... there can be positive wire 70a, 70b, 70c ... and negative wire 80a, 80b, 80c ....Positive wire 70a, 70b, 70c ... and negative wire 80a, 80b, 80c ... divide B to be electrically connected by wire connections, and adjacent battery unit 60a, 60b, 60c ... it is connected to each other. Wire connections divide B to can be being indirectly connected with or being directly connected to referring to described in Fig. 2 as described with reference to fig. 1.

It is describing referring to Figures 1 and 2 in the related technology, wire connections divide A not have safety in overcharge Element.However, in this disclosure, wire connections divide at least one of B to include failure of current battery unit 90.Electric current Cutting battery unit 90 is the safety element that electric current flowing is cut off in overcharge.Secondary cell must be protected from such as The abnormal conditions of overcharge, overdischarge, overheat and overcurrent etc, this disclosure provides one kind can protect secondary electricity Battery module of the pond from overcharge.

Fig. 3 shows failure of current battery unit 90 for example including in two neighboring battery unit, the first battery unit 60a Between the second battery unit 60b.Failure of current battery unit 90 is by the first battery unit 60a adjacent to each other and the second battery Unit 60b electrical connection, and in overcharge, the rupture of failure of current battery unit 90 is to disconnect electrical connection, to cut off electricity Stream flowing.

Failure of current battery unit 90 is also possible to secondary cell.Failure of current battery unit 90 can also have positive wire And negative wire.When the positive wire of failure of current battery unit 90 is connected to the negative wire 80a of the first battery unit 60a, And when the negative wire of failure of current battery unit 90 is connected to the positive wire 70b of the second battery unit 60b, in Fig. 3 It is shown to establish series connection.Such as it can be realized by ultrasonic bonding, resistance welding, laser welding and electroconductive binder every Connection between a lead, but present disclosure is without being limited thereto.

It may include at least one failure of current battery unit 90 in a battery module 100.Failure of current battery unit 90 may include dividing in B in each wire connections, but multiple battery unit 60a, 60b, 60c ... it is electrically connected to be formed Battery module 100 with a current flow path, therefore even if only one wire connections divides B to include failure of current electricity Pool unit 90 can also disconnect electrical connection in overcharge.

Preferably, in overcharge, failure of current battery unit 90 due under specific voltage by battery unit Pressure increase caused by the gas of generation and rupture.Principle is, causes internal pressure to be greater than electric current when generating due to gas When cutting off the sealing intensity of the battery case of battery unit 90, battery case is damaged and is ruptured.In another example, failure of current Battery unit 90 uses bimetallic, and in overcharge, bimetallic is bent because temperature increases, failure of current battery unit 90 Battery case can damage and rupture.The former cuts off electric current in overcharge more than specific voltage, and the latter is overcharging It is used in the adjoint raised situation of temperature of electricity.

In addition, traditionally, it is known that technology be in anode active material layer include lithium carbonate so that the resistance of positive plate It greatly increases and sufficiently achieves overcharge final voltage.Present disclosure uses the gas generating material of such as lithium carbonate etc, It should be noted that present disclosure is not only to make the resistance increase of positive plate to reach overcharge final voltage, and into one Step, the sealing intensity for the battery case for increasing to internal pressure greater than failure of current battery unit 90 due to gas generation, So that battery case is damaged and is ruptured, physically to cut off electrical communication path.

The relevant technologies described referring to Figures 1 and 2, which are divided at A in overcharge in wire connections, does not have safety member Part, but present disclosure divides at B the failure of current electricity having as safety element in overcharge in wire connections Pool unit 90.It should be noted that safety element is not implemented as the CID type connector of simple structure or the fuse of fusing, but It is realized in the form of " battery unit ".Therefore, electric current can safely be cut off in overcharge.Due to failure of current battery list Member 90 is realized in the form of " battery unit ", so being advantageous compared with connector or fuse in resistance.If Wire connections in the related technology shown in fig. 1 or fig. 2, which divide, is inserted into fuse in A, then resistance will be above in wire connections Divide resistance when being not inserted into fuse in A.In addition, fuse is difficult to cope with overcharge situation.Fuse is only flowed through in overcurrent In the case where just work when the temperature of secondary cell is increased because of resistance heating, therefore overcharged with that temperature is not raised Safety will be insufficient to assure that in electric situation.Present disclosure includes failure of current battery unit 90, since it is not used as resistance Component and have advantage.

According to present disclosure, only B can be divided without changing by the way that failure of current battery unit 90 is added to wire connections Allosteric at battery module 100 battery unit 60a, 60b, 60c ... Lai Zengjia safety.Without changing existing battery list Member, the installation insurance silk such as in contact conductor.In addition, the failure of current principle of present disclosure is not to destroy or melt company, institute The contact conductor of the battery unit connect.That is, existing battery unit is not changed into be formed the weak structure of mechanicalness or In the case where the structure melted at a certain temperature, the only rupture of failure of current battery unit 90 is electrically connected to disconnect.Do not change electricity The major advantage of the battery unit of pond module is that the resistance in the batch production or battery unit of battery module does not change.

Present disclosure is not limited to battery unit 60a, 60b, the 60c in battery module 100 included ... specific type, Quantity and connection method, but battery unit 60a, 60b, 60c ... it especially can be bag type secondary battery.Present disclosure is not It is limited to the specific type, quantity and connection method of failure of current battery unit 90, but failure of current battery unit 90 is particularly It is also possible to bag type secondary battery.It hereinafter, will be by describing the wherein battery unit of battery module and failure of current battery Unit is the embodiment of bag type secondary battery present disclosure is more fully described.

Fig. 4 is the schematic diagram for showing the battery module according to another embodiment of present disclosure.Fig. 5 is as Fig. 4 The top view of the bag type secondary battery for the unit cells unit for including in battery module.Fig. 6 is in the battery module of Fig. 4 The top view of failure of current battery unit.

Fig. 4 shows battery module 1000, for example including multiple battery unit 200a, the 200b being electrically connected in series, 200c ....As shown in Figure 5, multiple battery unit 200a, 200b, 200c ... each be bag type secondary battery 200 And structure having the same.

Referring to Fig. 5, bag type secondary battery 200 includes the electrode being contained in the bag shell 230 sealed in a gastight manner Component 210 and electrolyte solution.Wherein accommodate the bag shell 230 of electrode assembly 210 and electrolyte solution in a gastight manner by Sealing, and in order to which guard electrode component 210 and electrolyte solution are from external action, bag shell 230 may include metal layer, outer Portion's resin layer and inner resin layer.

One end of one end and negative wire 250 for being formed as the positive wire 240 of plate shape is respectively bound to electrode assembly 210 both ends, and the other end is respectively exposed to the outside of bag shell 230.One end of positive wire 240 is electrically connected to electrode group The positive plate of part 210, one end of negative wire 250 are electrically connected to the negative plate of electrode assembly 210.Contact conductor 240,250 The other end being exposed to outside bag shell 230 is for being electrically connected multiple bag type secondary batteries, as shown in Figure 4.

Lead film 260 is plugged between bag shell 230 and contact conductor 240,250.Setting lead film 260 is for into one Step improves the adhesiveness between bag shell 230 and contact conductor 240,250.Lead film 260 can be prevented in contact conductor 240,250 Short circuit occurs between the metal layer of bag shell 230, and improves the leakproofness of bag shell 230.Metal electrode lead 240, 250 with the thermal weld of polymer pouches shell 230, and contact resistance is slightly larger, reduces surface adhesion intensity.However, such as above-mentioned In embodiment, using lead film 260, it can prevent this adhesiveness from reducing phenomenon.In addition, lead film 260 is by can ideally cut The insulating materials of the disconnected electric current for being applied to bag shell 230 from contact conductor 240,250 is made.Lead film 260 is by with insulating properties It is formed with the film of thermoweldable characteristic.For example, lead film 260 can be by being selected from polyimides (Polyimide, PI), polypropylene, gathering The material of at least one of ethylene and polyethylene terephthalate (Polyethylene terephthalate, PET) Layer (monofilm or multimembrane) is formed.

Electrode assembly 210 is the component of element cell, and each element cell is with wherein positive plate and negative plate with diaphragm The structure that the mode being interposed therebetween is arranged.Element cell can be stacked simply (stack), stackable and folding (stack and Folding), or it may be produced that jellyroll (jelly roll) type electrode assembly.Manufacture the side of a plurality of types of electrode assemblies Method is well-known, and is omitted the detailed description herein.For example, electrode assembly 210 can be negative plate, diaphragm and positive plate Lamination.Electrode assembly 210 can be including negative plate/diaphragm/positive plate monocell type, or including negative plate/diaphragm/ Positive plate/diaphragm/negative plate or positive plate/diaphragm/negative plate/diaphragm/positive plate bicell type.Although the embodiment The bidirectional battery with the positive wire 240 and negative wire 250 that stretch out in the opposite direction from bag shell 230 is listed, but It is the unidirectional battery for being not excluded for both wherein positive wire 240 and negative wire 250 and being stretched out in one direction from bag shell 230 Embodiment.

Together referring to Fig. 4 and Fig. 5, battery unit 200a, 200b are stacked so that contact conductor extends and has from both ends Opposite polarity, for example, the negative wire 250b of the positive wire 240a and battery unit 200b of battery unit 200a is put parallel It sets.That is, multiple battery units stack in an alternating manner, so that the contact conductor placed parallel has opposite polarity. May be present it is many by battery unit 200a, 200b, 200c ... the method for series connection, Fig. 4 show contact conductor 240a, The other end of 250b is bent to the left or to the right to provide flat contact surface, and is led in the case where having overlapping between them Welding is crossed to be attached them.That is, in Fig. 4, by bending and connecting battery cell electrode lead 240a, 250b And form wire connections described in Fig. 3 and divide B, and the battery unit 200a of battery module 1000,200b, 200c ... B is divided to be connected to each other by wire connections.

In Fig. 4, including 11 battery units in total.The contact conductor of each battery unit is vertically bent, and with The vertical bending part of the contact conductor of another adjacent cell is overlapped, and divides B to form wire connections.More specifically, In battery unit 200a, 200b, the 200c of stacking ... side on, in addition to being arranged in outermost contact conductor, inside Contact conductor bend and be arranged to be overlapped, and bend electrode lead portion be electrically connected to each other.In the battery unit of stacking 200a, 200b, 200c ... the other side on, all contact conductor bend and have between them in the case where overlapping into Row welding, the electrode lead portion electrical connection that will be bent.

In Fig. 4, battery unit 200a, 200b, 200c ... it erects stack in vertical direction.When bending contact conductor When, the contact conductor on battery unit side is vertically bent on right side (or on the outside of battery module) direction, and on the other side Contact conductor is vertically bent on left side (or on the inside of battery module) direction.Therefore, the contact conductor bending of opposed polarity is laid equal stress on It builds upShape, so that forming the wire connections to be combined divides B.In addition, wire connections divide B parallel in the horizontal direction Arrangement.The process can execute in reverse order, for example, bent contact conductor, and under the bending state, it is stackable Battery unit and it can weld corresponding part.

In addition, although Fig. 4 is shown the method for being directly connected to contact conductor in the case where overlapping between contact conductor, But use the connection strap described referring to Fig.1 to be indirectly connected with method also possible.Certainly, for example, present disclosure can answer For the battery by welding together or manufacturing by welding electrode lead and external circuit contact conductor and busbar Module.The battery module 1000 of the embodiment includes the failure of current battery unit 300 divided in B positioned at wire connections, such as Shown in Fig. 6.

Referring to Fig. 6, failure of current battery unit 300 is also that electrode assembly 310 and electrolyte solution are contained in together with gas In the bag shell 330 that close mode is sealed.The bag shell 330 of failure of current battery unit 300 can be in a gastight manner by electrode Component 310 and electrolyte solution accommodate wherein, and in order to which guard electrode component 310 and electrolyte solution are from external shadow It rings, bag shell 330 may include metal layer, external resin layer and inner resin layer.

The other end of the other end and negative wire 350 that are formed as the positive wire 340 of plate shape is each attached to electrode The both ends of component 310, and it is exposed to the outside of bag shell 330.One end of positive wire 340 is electrically connected to electrode assembly 310 Positive plate, one end of negative wire 350 is electrically connected to the negative plate of electrode assembly 310.Lead film 360 is plugged on a bag shell Between 330 and contact conductor 340,350.Setting lead film 360 be for further increase bag shell 330 and contact conductor 340, Adhesiveness between 350.Contact conductor 340,350 be exposed to the external other end for be electrically connected battery unit 200a, 200b, as shown in Figure 7.

In addition, each element cell has wherein positive plate and bears here, electrode assembly 310 is the component of element cell The structure that pole plate is arranged in such a way that diaphragm is interposed therebetween.Element cell can be stacked simply, stackable and folding, or can be made Cause jelly roll electrode assembly.For example, electrode assembly 310 can be the lamination of negative plate, diaphragm and positive plate.Electrode assembly 310 can be including negative plate/diaphragm/positive plate monocell type, or including negative plate/diaphragm/positive plate/diaphragm/ Negative plate or positive plate/diaphragm/negative plate/diaphragm/positive plate bicell type.Although the embodiment, which lists, to be had The bidirectional battery of the positive wire 340 and negative wire 350 that are stretched out in opposite direction from bag shell 330, but be not excluded for wherein The unidirectional battery embodiment that both positive wire 340 and negative wire 350 are stretched out from bag shell 330 in one direction.

Fig. 7 is the two neighboring battery list for showing wherein failure of current battery unit and being attached in the battery module of Fig. 4 The schematic diagram of embodiment between member.

It is described together Fig. 7 with Fig. 4, when two adjacent cells in battery module 1000 are referred to as the first battery unit When 200a and the second battery unit 200b, the first battery unit 200a and failure of current battery unit 300 are connected in series, and electricity Stream cutting battery unit 300 and the second battery unit 200b are connected in series.Specifically, failure of current battery unit 300 is negative Pole lead 350 is connected to the positive wire 240a of the first battery unit 200a, and the anode of failure of current battery unit 300 draws Line 340 is connected to the negative wire 250b of the second battery unit 200b.As described above, the positive wire of the first battery unit 200a The negative wire 250b of 240a and the second battery unit 200b pass through the contact conductor 340,350 of failure of current battery unit 300 It is connected to each other, therefore the first battery unit 200a and the second battery unit 200b are electrically connected to each other.It can be by commonly used in the art Method realizes connection, such as can fetch realization by supersonic welding and combine and connect, and but it is not limited to this.

Even if the negative wire 250b of the positive wire 240a of the first battery unit 200a and the second battery unit 200b do not have It is directly connected to, the resistance of battery module 1000 there will not be problem.In addition, in order to keep battery module shown in Fig. 4 The distance between battery unit 200a, 200b, 200c in 1000 ..., only it is connect with failure of current battery unit 300 Partial contact conductor is short than the contact conductor of other parts.

In this disclosure, the position for two adjacent cells being electrically connected by failure of current battery unit 300 It is not particularly limited.For example, the battery unit at 1000 middle part of battery module can be electrically connected by failure of current battery unit 300, Or setting can be electrically connected in the outermost battery unit of battery module 1000 by failure of current battery unit 300.

Need to consider to place the space of failure of current battery unit 300 to determine the size of failure of current battery unit 300. In this embodiment, the cathode of the other end of the positive wire 240a of the first battery unit 200a and the second battery unit 200b The other end of lead 250b is facing with each otherly curved along the stacking direction of the first battery unit 200a and the second battery unit 200b Folding, and failure of current battery unit 300 is parallel to the bending part that stacking direction is placed on each contact conductor 240a, 250b Between, by each contact conductor 240a, 350,340,250b connection.

As shown in Figure 7, failure of current battery unit 300 is preferably than the first battery unit 200a and the second battery unit 200b is smaller or thinner, so that the bending part that each contact conductor 240a, 250b is arranged in failure of current battery unit 300 divides it Between, without influencing the distance between the first battery unit 200a and the second battery unit 200b.

For example, it is desirable that being designed as failure of current battery unit 300 than stretching out electrode from two adjacent cells Gap (distance) between two positions of lead is small.In addition, for ease of being welded with the contact conductor of adjacent cell It connects, failure of current battery unit 300 is preferably same or similar without very big with the thickness of the contact conductor of adjacent cell Difference.As described above, when failure of current battery unit 300 is small and thin, it is only necessary to which failure of current battery unit 300 to be mounted on Wire connections divide in B, do not need to distribute individual space for installation failure of current battery unit 300.

In this embodiment, failure of current battery unit 300 is by the first battery unit 200a adjacent to each other and second Battery unit 200b electrical connection, and in overcharge, failure of current battery unit 300 ruptures, to disconnect electrical connection.When 1000 overcharge of battery module, for example, battery module 1000 reaches specific voltage, such as when 5.0V, due to failure of current battery Gas is generated in unit 300 and failure of current battery unit 300 is caused to rupture, so that the first battery unit 200a and the second battery Electrical connection between unit 200b disconnects, so that it is guaranteed that the safety in the case of overcharge.

According to the embodiment, can include failure of current battery unit 300 between adjacent cell 200a, 200b with It establishes and is connected in series, to form electrical communication path.When overcharge occurs, such as when the case where reaching specific voltage, electric current Cutting battery unit 300 can be configured to the gas generating material for including from positive plate and generate gas.Failure of current battery unit 300 can be sufficiently small or thin, may be provided at it between adjacent cell 200a, 200b, and the gas due to wherein generating And it is easy to rupture.As a result, the electrical connection of adjacent cell 200a, 200b can disconnect, to cut off electric current flowing, so that it is guaranteed that electric The safety of pond module 1000.

Fig. 8 is the embodiment of the positive plate in the electrode assembly for including in the failure of current battery unit for show Fig. 6 Sectional view.

Referring to Fig. 8, positive plate 320 includes plus plate current-collecting body 322 and anode active material layer 324.

Anode active material layer 324 is formed on plus plate current-collecting body 322, and is generated including positive electrode active materials, gas Material 325, conductive material and adhesive.Positive electrode active materials and gas generating material 325 can mix.That is, Gas generating material 325 is evenly distributed in anode active material layer 324.Therefore, when forming positive plate 320, by gas Body generation material 325 is concomitantly introduced into binder solution and is shaken with positive electrode active materials and conductive material to be mixed with being formed Then the positive electrode active materials slurry of gas generating material is coated onto two surfaces of plus plate current-collecting body 322 at least On one surface, to form anode active material layer 324.If desired, the anode for being mixed with gas generating material can coated It is dried and suppresses after active material slurry.

" gas generating material " used herein refers to the material that gas is generated under specific voltage, and non-limiting example can It include: lithium carbonate (Li₂CO₃), calcium carbonate (CaCO₃), lithium nickel oxide (LNO:Lithium Nickel Oxide) and oxalic acid Lithium (Lithium oxalate).Preferably, the gas generating material 325 for including in anode active material layer 324, which can be, to be selected from One of group being made of lithium carbonate, calcium carbonate, lithium nickel oxide and lithium oxalate or their mixture.

In particular, can by control failure of current battery unit 300 positive plate 320 in include gas generating material 325 power off stream in specific voltage incision.For gas generating material 325, selection is being set as overcharge according to battery model Those of gas material is decomposed under the specific voltage of voltage.For example, it is desired to being typically considered the 4.5V for overcharging electric condition Above voltage incision power-off stream is to stop charging.For example, lithium carbonate is suitable as because decomposing under the voltage of 4.8V or more Gas generating material 325.For example, reaching in the case where lithium carbonate is used for gas generating material 325 when due to overcharge When 4.8V, Li₂CO₃It is decomposed into CO+CO₂Gas and internal pressure increases sharply, therefore failure of current battery unit 300 can be broken It splits.

Total weight based on positive electrode active materials and gas generating material 325, gas generating material 325 can be with 0.1 weights The amount of amount % to 20 weight % are included in positive plate 320.When including gas generating material 325 with above-mentioned amount, in overcharge In the case of can produce gas and failure of current battery unit 300 is rupturable.

The particle of gas generating material 325, especially lithium carbonate particle, such as can have spherical (sphere) shape, ellipse Circular shape and polygonal shape, but not limited to this.In addition, " spherical shape " shape used herein and " ellipse " shape refer to Spherical form and elliptical shape in extensive range, not only include completely or perfect " spherical shape " shape and " ellipse " shape, But also spherical form including spherical form and elliptical shape or usual acceptable level with deformed part and ellipse Circular shape.Lithium carbonate particle can have 0.1 μm to 50 μm of partial size.

The positive electrode active materials used in failure of current battery unit 300 are not limited to specific type, and can be with battery Battery unit 200a, 200b, 200c used in module 1000 ... positive electrode active materials it is identical or different.For example, positive Active material can include: lamellar compound, such as lithium and cobalt oxides (LiCoO₂) and lithium nickel oxide (LiNiO₂), or by one kind Or the compound of a variety of Transition metal substituteds；Chemical formula is Li_1+xMn_2-xO₄(x is 0~0.33), LiMnO₃、LiMn₂O₃、LiMnO₂ Lithium manganese oxide；Lithium Cu oxide (Li₂CuO₂)；Barium oxide, such as LiV₃O₈、LiFe₃O₄、V₂O₅、Cu₂V₂O₇；By chemistry Formula LiNi_1-xM_xO₂The Ni bit-type lithium nickel oxide that (M=Co, Mn, Al, Cu, Fe, Mg, B or Ga, x=0.01~0.3) indicates；By Chemical formula LiMn_2-xM_xO₂(M=Co, Ni, Fe, Cr, Zn or Ta, x=0.01~0.1) or Li₂Mn₃MO₈(M=Fe, Co, Ni, Cu Or Zn) indicate complex Li-Mn-oxide；The complex Li-Mn-oxide of spinel structure, such as LiNi_xMn_2-xO₄(x=0.01~ 0.6)；The wherein LiMn that Li is partly replaced by alkaline-earth metal ions in chemical formula₂O₄；Disulfide；And Fe₂(MoO₄)₃, but It is without being limited thereto.

Based on the total weight for the mixture for including positive electrode active materials, usually added with the amount of 1 weight % to 50 weight % Conductive material.Conductive material is not limited to any specific type, as long as the material is conductive and simultaneously will not be to corresponding electricity Pond causes chemical change, such as can include: graphite, such as natural graphite or electrographite；Carbon black, such as carbon black, acetylene Black, Ketjen black, channel black, furnace black, lampblack and thermal black；Conductive fiber, such as carbon fiber or metallic fiber；Metal Powder, such as carbon fluoride powder, aluminium powder and nickel powder；Conductive whiskers, such as zinc oxide and potassium titanate；Conductive metal oxide, it is all Such as titanium oxide；The conductive material of such as polyphenylene derivatives etc.

Adhesive helps for active material to be bound to gas generating material and conductive material and is bound to collector, and And the total weight based on the mixture for including positive electrode active materials, adhesive is usually added with the amount of 1 weight % to 50 weight %. The example of adhesive may include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, Regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethene, polyethylene, polypropylene, Ethylene-Propylene-Diene ter-polymers (EPDM), the EPDM, butadiene-styrene rubber, fluorubber and various copolymers of sulfonation.

Anode active material layer 324 can be wherein gas generating material 325 utilize adhesive bonding and fixation, and by Gap between gas generating material 325 and the porous structure for forming hole.With the porous of the hole formed as described above Structure increases and the electrolyte in the battery of assembling, the especially response area of electrolyte solution.Therefore, it can produce more Gas.The hole for being not filled by electrolyte solution can form the movable passageway that the gas diffusion of generation is gone out.In order to keep gas raw It effectively plays a role at material 325, it is important that increase the response area of anode active material layer 324.It is desirable that even if It is formed in relatively narrow region, still there is biggish surface area.For this purpose, many apertures can be formed in anode active material layer 324 Gap, for example, desired result can be reached by the partial size that regulating gas generates 325 particle of material.

If desired, the positive plate 320 of failure of current battery unit 300 can be further in anode active material layer 324 Additive including such as filler etc.Filler is not limited to optionally for the expansion for inhibiting anode active material layer 324, filler Any specific type as long as it is fibrous material and will not cause chemical change to corresponding battery simultaneously, such as can wrap It includes: olefin-based polymer, such as polyethylene and polypropylene；And fibrous material, such as glass fibre and carbon fiber.

Plus plate current-collecting body 322 is usually 3~500 μ m-thicks.Plus plate current-collecting body 322 is not limited to any specific type, as long as its Will not cause chemical reaction to corresponding battery with high conductivity and simultaneously, such as can include: stainless steel, aluminium, nickel, Titanium, calcining carbon or surface are through carbon, nickel, the aluminium or stainless steel of titanium and silver processing.Plus plate current-collecting body 322 can have subtle table Face texture, to increase the adhesion strength of positive electrode active materials, and plus plate current-collecting body 322 can have such as film, piece, foil, net, more The various forms of hole body, foam and non-woven fabrics etc.

Can by the way that negative active material slurry is applied on negative current collector, it is dry and suppress to manufacture failure of current electricity The negative plate for including in the electrode assembly 310 of pool unit 300, and optionally, if it is desired, negative plate can further comprise as Upper conductive material, adhesive and the filler.Negative current collector is usually 3~500 μ m-thicks.Negative current collector is not limited to any Specific type, if its is conductive and will not cause chemical reaction to corresponding battery simultaneously, such as can include: Copper, stainless steel, aluminium, nickel, titanium, calcining carbon, surface are through carbon, nickel, the copper or stainless steel and aluminium cadmium alloy of titanium and silver processing.In addition, Similar to plus plate current-collecting body 322, negative current collector can have subtle surface texture, strong with the adherency for increasing negative electrode active material Degree, and negative current collector can have the various forms of such as film, piece, foil, net, porous body, foam and non-woven fabrics etc.

Negative electrode active material is for example can include: carbon, such as ungraphitised carbon and graphite-based carbon；Composite oxide of metal, it is all Such as Li_xFe₂O₃(0≤x≤1)、Li_xWO₂(0≤x≤1)、Au_xMe_1-xMe'_yO_z(Me:Mn,Fe,Pb,Ge；Me':Al,B,P,Si, Periodic table the 1st, 2 and 3 race's elements, halogen；0<x≤1；1≤y≤3；1≤z≤8)；Lithium metal；Lithium alloy；Silicon-base alloy；Tinbase Alloy；Metal oxide, such as AuO, SnO₂、PbO、PbO₂、Pb₂O₃、Pb₃O₄、Sb₂O₃、Sb₂O₄、Sb₂O₅、GeO、GeO₂、 Bi₂O₃、Bi₂O₄And Bi₂O₅；Conducting polymer, such as polyacetylene；Li-Co-Ni sill；Titanium oxide；And Li-Ti oxide.

In failure of current battery unit 300, diaphragm is plugged between positive plate 320 and negative plate, and may include tool There is the insulation film of high ion permeability and mechanical strength, but not limited to this.In general, diaphragm with 0.01~10 μm aperture and 5~300 μm of thickness.Diaphragm is for example can include: chemical resistance and hydrophobic olefin-based polymer, such as polypropylene；With by Sheet material made of glass fibre or polyethylene or non-woven fabrics.When use the solid electrolyte of such as polymer etc as electrolyte When, which may act as diaphragm.

Electrolyte solution used in failure of current battery unit 300 may include electrolyte solution and lithium salts, and electrolyte is molten Liquid may include non-aqueous organic solvent, organic solid electrolyte and inorganic solid electrolyte, but not limited to this.

Non-aqueous organic solvent is for example can include: aprotic organic solvent, such as n-methyl-2-pyrrolidone, propylene carbonate Ester, ethylene carbonate, butylene, dimethyl carbonate, diethyl carbonate, gamma-butyrolacton, 1,2- dimethoxy-ethane, four Hydrogen furans (franc), 2- methyltetrahydrofuran, dimethyl sulfoxide, 1,3- dioxolanes, formamide, dimethylformamide, dioxy penta Ring, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphotriester, trimethoxy-methane, dioxolane derivatives, ring fourth Sulfone, methyl sulfolane, 1,3- dimethyl -2- imidazolidinone, propylene carbonate ester derivant, tetrahydrofuran derivatives, ether, propionic acid first Ester and ethyl propionate.

Organic solid electrolyte is for example can include: polythene derivative, polyethylene oxide derivant, polypropylene oxide are derivative Object, poly-D-lysine (agitation lysine), polyester sulfide, polyvinyl alcohol, gathers inclined difluoro second at phosphate ester polymer Alkene and polymer comprising ionic dissociation groups.

Inorganic solid electrolyte is for example can include: nitride, halide and the sulfate of Li, such as Li₃N、LiI、 Li₅NI₂、Li₃N-LiI-LiOH、LiSiO₄、LiSiO₄-LiI-LiOH、Li₂SiS₃、Li₄SiO₄、Li₄SiO₄- LiI-LiOH and Li₃PO₄-Li₂S-SiS₂。

Lithium salts is the material being readily dissolved in nonaqueous electrolyte, such as can include: LiCl, LiBr, LiI, LiClO₄、 LiBF₄、LiB₁₀Cl₁₀、LiPF₆、LiCF₃SO₃、LiCF₃CO₂、LiAsF₆、LiSbF₆、LiAlCl₄、CH₃SO₃Li、(CF₃SO₂)₂NLi, chloroborane lithium, lower alphatic carboxylic acid lithium, tetraphenylboronic acid lithium and acid imide.

In addition, in order to improve charge/discharge characteristics and anti-flammability, for example, pyridine, phosphorous acid can be added to electrolyte solution Triethyl, triethanolamine, cyclic ethers, ethylenediamine, n- glycol dimethyl ether (glyme), hexaphosphoric acid triamide, nitrobenzene derivative, Imidazolidine, the glycol dialkyl ether, ammonium salt, pyrroles, 2- first of oxazolidone, the N that sulphur, quinoneimine dye, N- replace, N- substitution Ethoxy-ethanol and alchlor.In some cases, halogen solvent, such as carbon tetrachloride and trifluoro-ethylene can be added, to assign Noninflammability can add carbon dioxide gas, to improve high-temperature storage characteristics, and can further comprise fluoro-ethylene carbonate (FEC, Fluoro-Ethylene Carbonate) and propene sultone (PRS, Propene sultone).

Fig. 9 is another embodiment party of the positive plate in the electrode assembly for including in the failure of current battery unit for show Fig. 6 The sectional view of formula.

Referring to Fig. 9, positive plate 320' includes plus plate current-collecting body 322, prime coat 326 and active material coating 327.

Prime coat 326 is formed on plus plate current-collecting body 322, and including gas generating material 325, conductive material and bonding Agent.Active material coating 327 is formed on prime coat 326, and including positive electrode active materials, conductive material and adhesive. That is in this embodiment, gas generating material 325 is not included in active material coating 327.

Therefore, when forming positive plate 320', gas generating material 325 and conductive material are concomitantly introduced into binder solution In and shake to prepare gas generating material slurry, then by gas generating material slurry be coated in plus plate current-collecting body 322 two On at least one surface in a surface, to be initially formed prime coat 326, then being formed includes positive electrode active materials, conduction material The positive electrode active materials slurry of material and adhesive is simultaneously coated on prime coat 326, to form active material coating 327.

In this case, gas generating material 325 is ideally with 90 weight % to 99.9 of the solid in prime coat 326 The amount of weight % exists.When the amount of gas generating material 325 is lower than lower limit, resistance increases deficiency, when gas generating material 325 Amount when being higher than the upper limit, the combination or electric conductivity between component are insufficient.

For remaining item, can equally use above with reference to those of Fig. 8 description.

In this embodiment, it is generated in the prime coat 326 between plus plate current-collecting body 322 and active material coating 327 Gas.Therefore, failure of current battery unit 300 can be rapidly achieved overcharge final voltage, including failure of current battery unit 300 Battery module 1000 can ensure that safety.

In embodiment in front, failure of current battery unit follows gas production principle.In another embodiment In, failure of current battery unit can be used to be increased and curved bimetallic in response to temperature.For example, in battery as shown in Figure 4 The contact conductor or electric current of the first battery unit 200a or the second battery unit 200b adjacent to each other in module 1000 is cut Power off pool unit 300 contact conductor in use bimetallic, make contact conductor in overcharge in response to temperature increase and Bending, and the bag shell 330 of failure of current battery unit 300 is made to damage and rupture.Figure 10 shows the first battery unit Positive wire 240a' example made of bimetallic of 200a.

Referring to Fig.1 0, the positive wire 240a' of the first battery unit 200a is made of bimetallic, and positive wire The end of 240a' is attached to failure of current battery unit 300 by attaching components 500.

Bimetallic is fabricated such that the metal with high thermal expansion coefficient forms the lower part 242 of lead and is connected to electric current The negative wire 350 of battery unit 300 is cut off, and the metal with low thermal coefficient of expansion forms the top 241 of lead.Have The non-limiting example of the metal of high thermal expansion coefficient may include cu zn alloy, nickel molybdenum/ferroalloy and nickel/manganese/ferroalloy, But not limited to this.The non-limiting example of metal with low thermal coefficient of expansion may include nickel iron alloy, but not limited to this.

Attaching components 500 are not limited to specific type, and including any type commonly used in the art, such as can be double Face insulating tape or adhesive.

The positive wire 240a' of the first battery unit 200a made of bimetallic due to overcharge generate heat when The difference of thermal expansion coefficient and be bent upwards away from the side of failure of current battery unit 300, in this case, be attached to the The bag shell 330 of the failure of current battery unit 300 of the positive wire 240a' of one battery unit 200a is due to attaching components 500 Rupture, to more easily cut off electric current.

In addition, the positive wire 240a' that the embodiment describes the first battery unit 200a is made of bimetallic, when So, the contact conductor of failure of current battery unit 300 can also be made of bimetallic.In this case, because battery unit does not have It changes, so the resistance on batch production advantage or battery unit, which does not change, will be better than the embodiment of front.

According to the configuration of above-mentioned present disclosure, because in wire connections point including failure of current battery unit, institute It is ruptured with failure of current battery unit in overcharge, to cut off electric current flowing.Thus, for example, even if secondary cell is protected The overcharge of protection circuit prevents function cisco unity malfunction, electric current flowing can be cut off also to stop charging.In addition, because electric current is cut Power-off pool unit is included in wire connections point, so not needing to distribute for installation failure of current battery unit individually empty Between.

There is high security according to the battery module of present disclosure, therefore be applicable to high-temperature stability, long circulating Medium-sized and large-scale plant the power supply of characteristic and high-rate characteristics.Medium-sized and large-scale plant preferable example can include: utilize electricity The power tool (power tool) that the power of machine is operated；Including electric vehicle (Electric Vehicle, EV), mixing Power electric vehicle (Hybrid Electric Vehicle, HEV), plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, PHEV) electric vehicle；Including electric bicycle (E-bike) and Segway Human Transporter (E- Scooter electric two-wheel vehicle)；Electric golf cart (electric golf cart)；And ESS, but not limited to this.

Although this public affairs hereafter is described in detail by describing the overcharge test result according to the test example of present disclosure Content is opened, but scope of the present disclosure without being limited thereto.

It manufactures battery unit 200a, 200b reducing the size of commercial battery with laboratory scale and manufactures lesser After failure of current battery unit 300, connection electrode lead is carried out with manufacturing experimental considerations unit module as shown in Figure 7 Overcharge test.The method of manufacture battery unit 200a, 200b and failure of current battery unit 300 is secondary based on manufacture pouch-type The conventional method of battery.

The method for manufacturing battery unit 200a, 200b is as follows.It is about 15~20 μm by the D50 as positive electrode active materials LiCoO₂, the Super P as conductive material and the polyvinylidene fluoride (polyvinylidene as binder polymer Fluoride it) is mixed with the weight ratio of 92:4:4, and N-Methyl pyrrolidone (NMP, N-methyl is added thereto Pyrrolidone), to prepare positive electrode active materials slurry.The positive electrode active materials slurry prepared as described above is applied to aluminium The plus plate current-collecting body of foil, and it is dry in 120 DEG C of vacuum drying oven, to manufacture positive plate.

In addition, carbonaceous mesophase spherules (MCMB, mesocarbon microbead) is used as negative electrode active material, Super P is used as conductive material, and PVdF is used as adhesive, and they are mixed and dispersed in the ratio (weight ratio) of 92:2:6 In NMP, to prepare negative active material slurry, then negative active material slurry is coated on the negative current collector of copper foil simultaneously It is dry, to manufacture negative plate.

Electrode assembly is manufactured by the way that polyethylene diagrams are arranged between the positive plate and negative plate manufactured as described above.It will Electrode assembly is connected to contact conductor and is put into bag shell, and injection is comprising being dissolved in the ethylene carbonate that volume ratio is 1:1 (EC) and the 1M LiPF in the mixture of dimethyl carbonate (DMC)₆Solution as electrolyte, and by bag shell with airtight Mode seals.

The method for manufacturing failure of current battery unit 300 is similar with the front manufacture method of battery unit 200a, 200b, no It is that anode active material layer further comprises gas generating material with place, and failure of current battery unit 300 and battery The contact conductor of unit 200a, 200b are equally small and thin.For gas generating material, the lithium carbonate with 5.0 μm of partial sizes is used.

In order to reach connection status shown in fig. 7, by ultrasonic bonding by the contact conductor of battery unit 200a and The contact conductor of failure of current battery unit 300 connects, and another contact conductor of failure of current battery unit 300 is connected It is connected to the contact conductor of battery unit 200b, is connected in series with establishing.

(step) carries out overcharge test in two steps on the unit module of series connection.Firstly, in room temperature (25 DEG C) and CC-CV charging is carried out under normal pressure, until SOC 100% (step 1: SOC 100% sets (setting)), and in order to overcharge Electrical testing continues CC charging as SOC increases from SOC 100% at normal temperatures and pressures, cuts off battery unit with verificating current Whether 300 will cut off electric current (step 2: overcharge).Overcharge assessment uses charge/discharge tester.By battery unit Each contact conductor of 200a, 200b and failure of current battery unit 300 is connected to the terminal channel of charge/discharge tester, and And the voltage (full cell voltage) of each battery unit is measured under overcharge.The charge/discharge that many manufacturers are commercially available Tester, for example, the equipment that HiTester of such as Hioki etc can be used.

Result is shown in Figure 11.Figure 11 is the song for showing the overcharge test result according to the test example of present disclosure Line chart.

Referring to Fig.1 1, with the continuation overcharge from SOC 100%, battery unit 200a, 200b and failure of current battery The voltage of unit 300 is slowly increased from about 4.4V.As overcharge continues, the voltage ratio of failure of current battery unit 300 The voltage of battery unit 200a, 200b increase faster than.This is because failure of current battery unit 300 than battery unit 200a, 200b is small and has low capacity.For example, when battery unit 200a, 200b are 40mAh batteries, failure of current battery unit 300 can be the 10mAh battery of more low capacity, therefore the charging current of same size be inputted, failure of current battery unit 300 voltage increases faster.When the voltage of failure of current battery unit 300 increases and then reaches about 4.9V or more, in electricity Rapid gas generating in stream cutting battery unit 300, and cell voltage increases rapidly.Failure of current battery unit 300 is in SOC There is the voltage for dropping to 0V at 130%.Failure of current battery unit 300 cannot bear internal pressure and finally rupture, as a result, The voltage of failure of current battery unit 300 can not be capable of measuring.After SOC 130%, the voltage of battery unit 200a, 200b are It is constant and converge on open-circuit voltage (OCV).This is because while charging currents without interruption, but electrical communication path is by electric current The rupture of cutting battery unit 300 is stopped.Therefore, it can be seen that the voltage in battery unit 200a, 200b by the test In the case of the overcharge of 4.8V or more, failure of current battery unit 300 effectively serves as safety element at SOC130%.

Figure 12 is the view for showing the battery pack according to one embodiment of present disclosure.Figure 13 is shown according to the disclosure The view of the vehicle of one embodiment of content.

2 and Figure 13 referring to Fig.1, battery pack 1200 may include at least one battery module according to aforementioned embodiments, example Such as, the battery module 1000 of second embodiment；And the battery housing 1210 for encapsulating the battery module.In addition to battery Except module 1000 and battery housing 1210, the battery pack 1200 according to present disclosure can further comprise for controlling electricity The various devices of the charge/discharge of pond module 1000, for example, battery management system (BMS, Battery Management System), current sensor and fuse.

Battery pack 1200 may be provided at the fuels sources in vehicle 1300 as vehicle 1300.For example, battery pack 1200 can be set It sets in the vehicle 1300 of such as electric vehicle, hybrid electric vehicle etc, and uses battery in any other manner Group 1200 is used as fuels sources.

Preferably, vehicle 1300 can be electric vehicle.Battery pack 1200 is used as the motor 1310 to electric vehicle It powers to drive the electric energy of vehicle 1300.In this case, battery pack 1200 has the high nominal voltage of 100V or more.Such as Fruit is used for hybrid electric vehicle, then is set as 270V.

According to the operation of motor 1310 and/or internal combustion engine, battery pack 1200 can be by 1320 charge or discharge of inverter.Battery Group 1200 can be charged by the refresh charging device for being connected to brake (break).Battery pack 1200 can be electrically connected by inverter 1320 It is connected to the motor 1310 of vehicle 1300.

As previously mentioned, battery pack 1200 further includes BMS.BMS estimates the state of the battery unit in battery pack 1200, and Battery pack 1200 is managed using the status information of estimation.For example, the status information of BMS estimation and management battery pack 1200, all Such as the charged state (SOC, State Of Charge) of battery pack 1200, health status (SOH, State Of Health), most Input/output power permissible greatly and output voltage.In addition, BMS can control battery pack 1200 using the status information Charge or discharge, and further estimate when replace battery pack 1200.

ECU 1330 is the electronic control unit for controlling the state of vehicle 1300.For example, ECU 1330 is based on accelerator (accelerator), the information of brake, speed etc. determines torque information, and motor 1310 is controlled according to torque information Output.In addition, ECU 1330 based on from the status information of such as SOC, SOH or the like of the received battery pack 1200 of BMS to Inverter 1320 sends control signal, to carry out charge or discharge to battery pack 1200.Inverter 1320 allows based on ECU 1330 control signal carries out charge or discharge to battery pack 1200.Motor 1310 is based on from the received control information of ECU 1330 (for example, torque information) drives vehicle 1300 by using the electric energy of battery pack 1200.

Vehicle 1300 includes the battery pack 1200 according to present disclosure, and battery pack 1200 includes foregoing tool The battery module 1000 for the safety being improved.Therefore, the stability of battery pack 1200 improves, and battery pack 1200 has height It stability and can be used for a long time, therefore be safe including the vehicle of the battery pack 1,200 1300 and be easy to drive.

Other than vehicle 1300, battery pack 1200 can also be provided at the other kinds of device using secondary cell, set Standby and equipment, in such as ESS BMS.

As described above, according to the battery pack 1200 of the embodiment and device, equipment and dress including the battery pack 1200 Standby, such as vehicle 1300 includes above-mentioned battery module 1000, therefore can realize there is that above-mentioned battery module 1000 is all Battery pack 1200 and device, equipment and equipment including the battery pack 1200, such as vehicle 1300.

Although the embodiment and attached drawing that have been directed to limited quantity above describe present disclosure, in the disclosure Hold it is without being limited thereto, it will be apparent to one skilled in the art that can technical aspect in present disclosure and appended right It is required that equivalency range in it is carry out various modifications and is changed.