阅读说明：本技术 能够排出气体的二次电池的袋形电池壳体 (The pouch-shaped battery shell of the secondary cell of gas can be discharged ) 是由 黃隨枝 崔龙洙 金橡熏 庾亨均 金奈润 姜旻亨 金龙 于 2018-07-05 设计创作，主要内容包括：本文公开了一种二次电池的袋形电池壳体,袋形电池壳体配置为在电极组件安装于其中的状态下通过热熔合而密封,其中：袋形电池壳体配置为具有外涂层、金属阻挡层(Barrier Layer)和内粘合剂层顺序堆叠的结构,其中粘合剂层插置在外涂层与金属阻挡层之间以增大它们之间的粘合力,并且其中粘合剂层也插置在金属阻挡层与内粘合剂层之间以增大它们之间的粘合力；上壳体的外边缘和下壳体的外边缘通过热熔合而密封,使得所述电极组件安装于所述袋形电池壳体中；并且在由于上壳体和下壳体热熔合而形成的密封部分中设置有允许袋形电池壳体的内部和外部彼此连通的气体排出构件。(Disclosed herein is a kind of pouch-shaped battery shells of secondary cell, pouch-shaped battery shell is configured under electrode assembly state mounted therein seal by heat fusion, wherein: pouch-shaped battery shell is configured to the structure that there is external coating, metal barrier (Barrier Layer) and inner binder layer sequence to stack, wherein adhesive phase is plugged on to increase the bonding force between them between external coating and metal barrier, and wherein adhesive phase is also plugged between metal barrier and inner binder layer to increase the bonding force between them；The outer edge of upper housing and the outer edge of lower case are sealed by heat fusion, so that the electrode assembly is installed in the pouch-shaped battery shell；And being provided in the hermetic unit formed due to upper housing and lower case heat fusion allows the inside and outside gas to communicate with each other of pouch-shaped battery shell that component is discharged.)

1. a kind of pouch-shaped battery shell of secondary cell, the pouch-shaped battery shell is configured to mounted therein in electrode assembly It is sealed under state by heat fusion, wherein

The pouch-shaped battery shell is configured to suitable with external coating, metal barrier (Barrier Layer) layer and inner binder layer The structure that sequence stacks, wherein adhesive phase is plugged between the external coating and the metal barrier to increase between them Bonding force, and wherein adhesive phase be also plugged between the metal barrier and the inner binder layer with increase them it Between bonding force,

The outer edge of upper housing and the outer edge of lower case are sealed by heat fusion so that the electrode assembly be installed on it is described In pouch-shaped battery shell, and

Being provided in the hermetic unit formed due to the upper housing and lower case heat fusion allows the pouch-shaped electricity The inside and outside gas discharge component to communicate with each other of pond shell.

2. pouch-shaped battery shell according to claim 1, wherein gas discharge component is strip tubular element.

3. pouch-shaped battery shell according to claim 2, wherein gas discharge component is configured to have and wherein be formed There is the porous structure of open type hole.

4. pouch-shaped battery shell according to claim 1, wherein gas discharge component includes gas adsorption material.

5. pouch-shaped battery shell according to claim 2, wherein gas discharge component is placed such that the gas The length direction that component is discharged in body is consistent with the inside and outside direction to communicate with each other of the pouch-shaped battery shell.

6. pouch-shaped battery shell according to claim 1, wherein gas discharge component is located at quilt in vertical direction The middle part of the inner binder layer of the inner binder layer and lower case of the upper housing of heat fusion.

7. pouch-shaped battery shell according to claim 1, wherein component, which is discharged, in the gas carries out normal operating in battery In the state of prevent foreign matter to be introduced into the pouch-shaped battery shell, and pressure of the gas discharge component in the battery Gas is discharged from the pouch-shaped battery shell when power increases.

8. pouch-shaped battery shell according to claim 1, wherein gas discharge component includes setting at predetermined intervals Component is discharged in each gas set in the entire hermetic unit.

9. pouch-shaped battery shell according to claim 2, wherein the thickness of the gas discharge component of tubulose is less than institute State the sum of the thickness of the thickness of the inner binder layer of upper housing and the inner binder layer of the lower case.

10. pouch-shaped battery shell according to claim 1, wherein gas discharge component is being set to the sealing It is fixed in the state of in point by heat fusion.

11. a kind of pouch-shaped battery unit, the pouch-shaped battery unit includes bag according to any one of claim 1 to 10 Shape battery case.

Technical field

This application claims enjoy in the South Korea patent application submitted in Korean Intellectual Property Office on October 17th, 2017 The disclosure of the South Korea patent application is integrally incorporated herein by No. 2017-0134648 equity by reference.

The present invention relates to the pouch-shaped battery shells for the secondary cell that gas can be discharged, and more particularly, are related to a kind of packet The pouch-shaped battery shell for the secondary cell for allowing the inside and outside gas to communicate with each other of pouch-shaped battery shell that component is discharged is included, The gas discharge component be arranged in due to be hot-melted wherein be equipped with electrode assembly upper housing and lower case outer edge and shape At hermetic unit in.

Background technique

Requirement of the secondary cell that can be charged and discharged as the substitution for being proposed as gasoline vehicle and diesel vehicle The power supply of the means of transport of height output and large capacity and be highly valued, means of transport includes that electric vehicle (EV), mixing are dynamic Power vehicle (HEV) and plug-in hybrid vehicle (Plug-In HEV).

Based on its shape, secondary cell can be divided into cylindrical battery, prismatic batteries and pouch-shaped battery.Work as in these batteries In, can with high integration stacking, the energy density with high per unit weight, the cheap and pouch-shaped battery that can be easily modified by To great attention.

Pouch-shaped battery unit is the battery unit for including the battery case made of laminate, and wherein electrode assembly is mounted on In battery case.

Main research project about pouch-shaped battery first is that improving the peace that its outer surface is usually soft pouch-shaped battery Quan Xing.Due to secondary cell abnormality (short circuit in such as secondary cell, the case where being higher than the current or voltage allowed Under the overcharge of secondary cell, secondary cell be exposed to high temperature or secondary cell due to falling or with being applied to the outer of its Portion's impact and deform etc) caused by high temperature and high pressure in secondary cell, lithium secondary battery may explode.

In addition, wherein leading to the pressure in pouch-shaped battery due to generating bulk gas during the use of pouch-shaped battery In the case where increasing to predeterminated level, the hermetic unit of pouch-shaped battery may be vented (venting).

Made it is various trial to prevent the hermetic unit of pouch-shaped battery due to the increase of the internal pressure of pouch-shaped battery and Exhaust improves the safety of pouch-shaped battery.

Korean Patent Application Publication case the 2012-0103206th disclose it is a kind of be configured to have following structure it is secondary Battery: forming safety diaphragm on electrode contact, so that safety diaphragm is melted quickly to solve when the temperature or pressure increase in battery Except the sealing state of battery case.

Secondary cell disclosed in Korean Patent Application Publication case the 2012-0103206th is arranged so as to prevent battery Explosion or kindling.However, battery can not be used again.

Korean Patent Application Publication case the 2016-0014828th disclose a kind of opening including capableing of adjusts path and Close the exhaust system of the exhaust apparatus gas to be discharged except pouch-typed secondary battery.According to Korean Patent Application Publication case No. 2016-0014828, gas can be discharged from secondary cell, and secondary cell can continue to use.The exhaust apparatus includes having Adjustment unit is discharged in the gas of main body, stop member and elastic component.That is needing additional complexity in order to which gas is discharged Component.

Korean Patent Application Publication case the 2017-0043926th disclose it is a kind of be configured to have following structure it is secondary Battery: the airbag for accommodating the gas generated in battery is formed as non-fusion area in the hermetic unit of battery.However, by It is located in hermetic unit in airbag, therefore the gas generated in battery cannot be fully drained except battery.

Therefore, to such technology in the presence of there is an urgent need to can be deform the outer shape of pouch-shaped battery In the case of mode as before while use pouch-shaped battery, the gas that will be generated during the use of conventional pouch-shaped battery It is discharged to except pouch-shaped battery, the technology for thus enabling pouch-shaped battery continue to use.

Summary of the invention

Technical problem

In view of the above problems and the other technologies problem that has not been resolved and make the present invention, the object of the present invention is to provide A kind of pouch-shaped including the gas discharge component being arranged in the hermetic unit formed due to heat fusion upper housing and lower case Battery case, the gas discharge component is configured to that the inside and outside of pouch-shaped battery shell is allowed to communicate with each other, so that in bag The gas generated in pouch-shaped battery during the use of shape battery can be discharged component by the gas and be discharged to pouch-shaped battery Except shell.

It is therefore possible to prevent the hermetic unit in battery case during the use of pouch-shaped battery in pouch-shaped battery due to producing The expansion of battery case caused by raw gas and be damaged.

Technical solution

According to an aspect of the present invention, it can be addressed by providing a kind of pouch-shaped battery shell of secondary cell to realize Other purposes, the pouch-shaped battery shell are configured under electrode assembly state mounted therein seal by heat fusion, Wherein: the pouch-shaped battery shell is configured to suitable with external coating, metal barrier (Barrier Layer) layer and inner binder layer The structure that sequence stacks, wherein adhesive phase is plugged between the external coating and the metal barrier to increase between them Bonding force, and wherein adhesive phase be also plugged between the metal barrier and the inner binder layer with increase them it Between bonding force；The outer edge of upper housing and the outer edge of lower case are sealed by heat fusion, so that the electrode assembly is pacified Loaded in the pouch-shaped battery shell；And in the hermetic unit formed due to the upper housing and lower case heat fusion In be provided with and allow the inside and outside gas to communicate with each other of the pouch-shaped battery shell that component is discharged.

At least one of upper housing and lower case may be provided with for accommodate electrod component-recess unit.In electrode assembly After being placed into concave units, the outer edge of upper housing and lower case can be positioned to that in the outer edge of upper housing and lower case This is sealed in the state of facing by heat fusion.

During the normal use of pouch-shaped battery and in the case where pouch-shaped battery abnormal operation, due to electrode activity material Expect with reacting between electrolyte solution and cause in pouch-shaped battery generate include carbon dioxide gas.It is produced in due to battery Raw gas and in the case where causing the pressure in battery to increase, the outer edge for passing through the battery case that heat fusion seals may It can be vented.In the higher situation of pressure in the battery, battery can possibly even explode.

In the present invention, gas discharge component is arranged in the hermetic unit of battery case, so that the inside of battery case It communicates with each other with outside via gas discharge component.Therefore, the gas generated in battery can be discharged component by gas and be discharged to Except battery.

It is furthermore an advantage that do not need additional device, but only component is discharged with by gas in setting gas It is discharged to except battery, thus can reduce overall dimensions of the pressure in pouch-shaped battery without increasing pouch-shaped battery.

In addition, gas discharge component is only placed on the state between upper housing and lower case by the way that component is discharged in gas Under be sealed and be fixed in the hermetic unit of battery case via heat fusion.It is therefore not necessary to which component is discharged in fixed gas Additional process.

In specific example, gas discharge component can be configured to be located at the close of battery case with wherein gas discharge component So that the inside and outside of battery case communicates with each other and wherein the overall size and shape of pouch-shaped battery shell be not in envelope part The structure to change.For example, gas discharge component can be strip tubular element.

The gas discharge component can be configured to the porous structure for being formed with open type hole.Gas can be by opening Type hole is put to be discharged to except battery.

The inside and outside of battery case is discharged component via gas and communicates with each other.Therefore, the pressure in pouch-shaped battery In the case that power increases due to the gas that generates in pouch-shaped battery, gas can be discharged to except pouch-shaped battery.Due to pouch-shaped Pressure in battery is higher, therefore foreign matter is prevented to be introduced in battery.In addition, the pressure in pouch-shaped battery is maintained and is equal to Or it is higher than external pressure.It is therefore prevented that foreign matter is introduced into battery by the opening type hole that gas is discharged in component.

In specific example, gas discharge component may include the metal oxide or metal hydrogen-oxygen as gas adsorption material Compound.Gas can be removed more quickly from battery due to gas adsorption material.

In addition, it is contemplated that the type of used electrode active material and electrolyte solution, it may include can adsorb and be produced The specific gas adsorbent material of raw bulk gas, is thus selectively removed gas.

In view of gas is discharged, component is strip tubular element and gas discharge component is placed such that battery case Inside and outside the fact that can communicate with each other, gas discharge component may be oriented so that gas discharge component length direction It is consistent with the inside and outside direction to communicate with each other of pouch-shaped battery shell.

Gas is discharged component and is located in the hermetic unit formed due to upper housing and lower case heat fusion.Therefore, it seals It is partially configured to surround the outer surface of gas discharge component, thus steadily component can be discharged by fixed gas.Specifically, gas is arranged Component can be located in vertical direction in the inner binder layer of upper housing and the inner binder layer of lower case being co-melted out Portion.

In view of even if gas discharge component is placed such that the inside and outside of battery case can communicate with each other, electricity The fact that the pressure in pond is also usually maintained above the pressure of outside batteries is discharged component by gas and foreign matter is introduced pouch-shaped A possibility that in battery case, is very low.That is gas discharge component can prevent in the state that battery carries out normal operating Foreign matter is introduced into pouch-shaped battery shell, and gas discharge component can pressure in the battery when increasing from pouch-shaped battery shell Gas is discharged.

Component, which is discharged, in gas can be located in some outer edges in four outer edges of battery case.However, in order to from electricity Gas is quickly discharged in pond, and multiple independent gas rows can be arranged in the hermetic unit for four outer edges for being formed in battery case Component out.

Therefore, each gas discharge component can be arranged at predetermined intervals in entire hermetic unit.

The overall thickness of pouch-shaped battery shell increases since component is discharged in gas in order to prevent, and component is discharged in the gas of tubulose Thickness be smaller than upper housing inner binder layer thickness and lower case inner binder layer the sum of thickness.For example, tubulose Gas discharge component thickness can be upper housing inner binder layer thickness and lower case inner binder layer thickness The sum of 50% to 90%.

In the case where the thickness of the gas of tubulose discharge component is less than the 50% of the sum of thickness of inner binder layer, discharge The path of gas narrows, and is thus difficult to that gas is quickly discharged from battery, this is undesirable.Component is discharged in the gas of tubulose In the case that thickness is greater than the 90% of the sum of thickness of inner binder layer, gas discharge component cannot be firmly secured at adhesive Between layer, this is also undesirable.

As described above, gas according to the present invention discharge component be arranged in the hermetic unit of battery case without Increase the overall size of battery case or makes the shape distortion of battery case.Since gas discharge component is in being set to hermetic unit In the state of by heat fusion fix, therefore do not need fixed gas discharge component additional process.

According to other aspects of the invention, a kind of pouch-shaped battery unit and packet including the pouch-shaped battery shell is provided Include the battery pack of the pouch-shaped battery unit.

Specifically, battery pack can be used as needing to bear the electricity of the device of the ability of high temperature, long-life, high-rate characteristics etc. Source.The specific example of described device may include electronic apparatus (mobile device), wearable electronics (wearable device), motor-driven electric tool (power tool), such as electric vehicle are battery powered (Electric Vehicle, EV), hybrid vehicle (Hybrid Electric Vehicle, HEV) or plug-in mixing are dynamic Electric car, such as electric bicycle (E-bike) of power vehicle (Plug-in Hybrid Electric Vehicle, PHEV) Or electric two-wheel vehicle, electric golf cart (electric golf cart) and the energy of Segway Human Transporter (E-scooter) Storage system (Energy Storage System).However, the invention is not limited thereto.

The structure and manufacturing method of device are known in fields of the present invention, therefore its detailed description will be omitted.

Detailed description of the invention

Fig. 1 be show embodiment according to the present invention pouch-shaped battery shell be provided with gas discharge component The vertical cross section of hermetic unit.

Fig. 2 is the vertical cross section for showing the state that the hermetic unit of the pouch-shaped battery shell of wherein Fig. 1 is co-melted.

Fig. 3 is the vertical cross section for showing a part of pouch-shaped battery shell of Fig. 2.

Fig. 4 is the plan view for showing the pouch-shaped battery of embodiment according to the present invention.

Specific embodiment

Now, it will be described in detail with reference to the accompanying drawings the preferred embodiment of the present invention, so that of the art common Technical staff can easily implement the preferred embodiment of the present invention.However, in detailed description of the present invention preferred embodiment Operating principle when, if subject of the present invention may be made unclear the detailed description of the known function and construction that are incorporated to herein, The detailed description will then be omitted.

It will indicate the part of execution identity function or operation using same reference mark as far as possible throughout the drawings.Separately Outside, in the following description of the present invention, in the case where a part is " connected " to another part, described a part not only can be direct It is connected to described another part, and described a part can be indirectly connected to described another part via other part.In addition, The a certain element of " comprising " is not meant as excluding other elements, but can further comprise other elements, unless the contrary indication.

It reference will now be made in detail to the preferred embodiment of the present invention now, some examples of these embodiments are shown in the drawings.

Fig. 1 is the vertical cross section for showing the hermetic unit of pouch-shaped battery shell of embodiment according to the present invention, Fig. 2 It is the vertical cross section for schematically illustrating the state that the hermetic unit of the pouch-shaped battery shell of wherein Fig. 1 is co-melted.

Referring to Figures 1 and 2, pouch-shaped battery shell 100 includes upper housing 110 and lower case 120.Upper housing 110 and lower casing Body 120 is configured to structure having the same.Specifically, upper housing 110 is configured to external coating 101,102 and of metal barrier The structure that inner binder layer 103 is stacked from external sequence in the inward direction, wherein adhesive phase 104 is plugged on external coating 101 To increase the bonding force between them between metal barrier 102, and adhesive phase 104 is also plugged on metal barrier To increase the bonding force between them between 102 and inner binder layer 103.

Strip tubulose is set between the inner binder layer 103 of upper housing 110 and the inner binder layer 123 of lower case 120 Component 130 is discharged in gas, to extend through the inside and outside of battery case.

Heat and pressure are applied to the upper and lower surfaces of pouch-shaped battery shell 100 in the direction followed the arrow In the case of, the inner binder layer of upper housing as shown in Figure 2 and lower case is melted to form single adhesive phase 113.As a result, gas The outer surface of discharge component 130 can be surrounded by adhesive phase 113, thus can fixed gas discharge component 130.Component is discharged in gas 130 diameter can be the 50% to 90% of the height of adhesive phase 113.Component 130 is discharged in gas can position in vertical direction In the middle part of adhesive phase 113.

Fig. 3 is the vertical cross section for schematically illustrating a part of pouch-shaped battery shell of Fig. 2.

Referring to Fig. 3, the electrode assembly 240 for being configured to the structure being plugged between positive electrode and negative electrode with its septation is installed In the battery case for including upper housing 210 and lower case 220.Upper housing 210 and the outer edge of lower case 220 pass through heat fusion And it seals.

Gas discharge component 230 is arranged in be melted by the inner binder layer of upper housing 210 and the inner binder layer of lower case 220 Change and in the hermetic unit of formation.The inside and outside of battery case is discharged component 230 via gas and communicates with each other, and thus may be used Component 230 is discharged from cell discharge gas by gas.

Show single gas discharge component 230.Alternatively, multiple gas discharge components can be plugged in vertical direction Between shell and the inner binder layer of lower case.

Fig. 4 is the plan view for schematically illustrating the pouch-shaped battery of embodiment according to the present invention.

Referring to Fig. 4, pouch-shaped battery 300 includes having the concave units formed therein for accommodate electrod component 310 307 battery case, the positive tab 301 and negative tab 303 stretched out along different directions are attached to electrode assembly 310.Connection Positive wire 302 to positive tab 301 extends to except battery case with the negative wire 304 for being connected to negative tab 303.

When watching in the plan view, each gas discharge component 330 be arranged in battery case left hermetic unit 311, Right hermetic unit 312, top sealed portion 313 and sealing portion are divided in 314.Each gas discharge component 330 is at equal intervals Setting.Alternatively, each gas discharge component 330 is arranged at different intervals.As another substitution, it is contemplated that in the longitudinal direction The middle part of battery case expand more facts than the rest part of battery case, each gas discharge component can be in length side The middle part of upward battery case is arranged with lesser interval.

Certainly, each gas discharge component can be provided only in a hermetic unit, or can be provided only on close from four In two or three hermetic units selected in envelope part.

Those skilled in the art in the invention will be understood that, without departing substantially from the scope of the present invention, be based on more than Description can make various applications and modification.

Industrial applicibility

As is apparent from the above description, pouch-shaped battery shell according to the present invention includes upper housing and lower case, institute The outer edge for stating upper housing and lower case is sealed under electrode assembly state mounted therein by heat fusion, wherein making electricity The inside and outside gas discharge component to communicate with each other of pond shell is arranged in by upper housing and lower case sealing and is formed close It seals in part, component thus can be discharged by gas from cell discharge gas.

Further, since gas discharge component be located in the hermetic unit of battery case, therefore the overall size of pouch-shaped battery with/ Or shape does not change, and since the close of battery case can be arranged in the process of manufacture pouch-shaped battery in gas discharge component It seals in part, therefore does not need to execute the additional process of installation gas discharge component.

In addition, gas is electric from pouch-shaped in the case that the pressure in pouch-shaped battery increases during the use of pouch-shaped battery Pond discharge, the and in the case that pressure in pouch-shaped battery reduces during the use of pouch-shaped battery, it is therefore prevented that gas is from pouch-shaped Battery discharge, both of these case repeat.Therefore, sustainable to use battery.