阅读说明：本技术 电池模组及其制作方法 (Battery module and manufacturing method thereof ) 是由 何志明 于 2020-04-27 设计创作，主要内容包括：本公开是关于一种电池模组及其制作方法,所述电池模组包括：多层电极片；所述多层电极片堆叠设置或者卷绕设置；多个极耳,分别连接在所述多层电极片边缘；极耳封装体,位于所述极耳的至少一个侧面；位置重叠的所述多个极耳,通过所述极耳封装体固定在一起。通过本公开实施例的技术方案,电池的多层电极片具有多个封装在一起的极耳,能够提升电池的充放电功率,降低电池阻抗,提升充放电速度。(The present disclosure relates to a battery module and a method for manufacturing the same, the battery module includes: a plurality of electrode sheets; the multilayer electrode plates are stacked or wound; the plurality of tabs are respectively connected to the edges of the multilayer electrode plates; a tab package body positioned at least one side surface of the tab; the plurality of tabs with overlapped positions are fixed together through the tab packaging body. Through the technical scheme of the embodiment of the disclosure, the multilayer electrode slice of the battery is provided with a plurality of electrode lugs packaged together, so that the charging and discharging power of the battery can be improved, the battery impedance is reduced, and the charging and discharging speed is improved.)

1. A battery module, comprising:

a plurality of electrode sheets; the multilayer electrode plates are stacked or wound;

the plurality of tabs are respectively connected to the edges of the multilayer electrode plates;

a tab package body positioned at least one side surface of the tab;

the tabs with overlapped positions are fixed together through the tab packaging body.

2. The battery module according to claim 1, wherein the tab package body comprises: a tab glue attached to at least one side surface of the tab; wherein, utmost point ear is the lamellar structure, at least one side is: at least one of the two faces of the sheet structure.

3. The battery module according to claim 2, wherein the material of the tab glue comprises one or a combination of the following:

polypropylene PP;

polyethylene PE;

polyester resin PET;

and (3) polyimide PI.

4. The battery module according to claim 2, wherein the tab glue is located on at least a partial region of at least one side surface of the tab; the thickness of the tab glue is 5-30 microns.

5. The battery module according to claim 4, wherein the tab compound has a width greater than that of the tab and a length less than that of the tab;

at least partial area of one end of the tab, which is far away from the electrode plate, is not covered by the tab glue.

6. The battery module according to any one of claims 1 to 5, wherein the battery module comprises: a battery package; the battery packaging body wraps the multilayer electrode plate.

7. The battery module according to claim 6, wherein the battery pack has an opening, the tab pack is fixed at the opening, and at least a portion of the tab is located outside the battery pack.

8. The battery module according to any one of claims 1 to 5, wherein the wound multilayer electrode sheet is formed by synchronously winding a positive electrode sheet and a negative electrode sheet; the stacked multilayer electrode plate is formed by alternately stacking a positive electrode plate and a negative electrode plate;

a plurality of tabs of the positive electrode plate are fixed together, and a plurality of tabs of the negative electrode plate are fixed together;

and the positive electrode plate and the negative electrode plate are mutually separated.

9. The battery module according to any one of claims 1 to 5, wherein the electrode tabs include a positive electrode tab and a negative electrode tab; the positive electrode plate and the negative electrode plate are distributed in a crossed manner;

the battery module further includes:

a diaphragm; the diaphragm is located between the positive electrode sheet and the negative electrode sheet.

10. A manufacturing method of a battery module is characterized by comprising the following steps:

attaching a tab packaging body to the side surface of each tab of the electrode plate; the edge of the electrode plate is provided with a plurality of tabs;

winding or stacking to form a multilayer electrode plate, wherein the positions of the plurality of tabs are overlapped after winding or stacking;

heating and softening the tab packaging bodies to connect the tab packaging bodies attached to the tabs;

and cooling the tab packaging body to enable the tabs to pass through the tab packaging body to be fixed together.

11. The manufacturing method according to claim 10, wherein attaching the tab package to the side surface of each tab of the electrode sheet includes:

and thermoplastic tab glue is attached to the side surface of each tab of the electrode plate.

12. The method as claimed in claim 11, wherein the heating softens the tab packages to interconnect the tab packages attached to the plurality of tabs, and comprises:

softening the tab package by heating the tab package to between 120 and 160 degrees celsius;

and pressing and bonding the softened tabs, and sealing and fixing the tabs.

13. The method of manufacturing of claim 10, further comprising:

wrapping a battery packaging body at the periphery of the electrode plate; wherein the battery package body is provided with an opening, and at least part of the plurality of tabs are positioned outside the battery package body;

and heating the tab packaging body at the opening of the battery packaging body to soften the tab packaging body and hermetically connect the tab packaging body with the opening of the battery packaging body.

14. The method of manufacturing of claim 10, further comprising:

forming a plurality of tabs on the edge of the sheet-shaped current collector;

and coating active materials to form the electrode plate in the areas of the sheet-shaped current collector except the areas where the plurality of tabs are formed.

15. The manufacturing method according to claim 14, wherein the step of coating an active material on the sheet-like current collector in the region other than the region where the plurality of tabs are formed to form the electrode sheet comprises:

coating a compound material containing lithium element on the sheet-shaped current collector in the area except the areas where the tabs are formed to form a positive electrode sheet; and/or the presence of a gas in the gas,

and coating a carbon material on the sheet-shaped current collector in the areas except for the plurality of tabs to form a negative electrode sheet.

Technical Field

The present disclosure relates to the field of batteries, and particularly to a battery module and a method for manufacturing the same.

Background

With the continuous update of various electronic devices, the battery requirements of the electronic devices are also higher and higher. High battery capacity, fast charging, and small size are the main research directions for battery development. The battery structure has a crucial influence on the energy density and the quick charge capacity of the battery, and how to improve the energy density of the battery while quickly charging is one of the important research subjects for the design of the battery structure.

Disclosure of Invention

The present disclosure provides a battery module and a method of manufacturing the same.

According to a first aspect of the embodiments of the present disclosure, there is provided a battery module including:

a plurality of electrode sheets; the multilayer electrode plates are stacked or wound;

the plurality of tabs are respectively connected to the edges of the multilayer electrode plates;

a tab package body positioned at least one side surface of the tab;

the tabs with overlapped positions are fixed together through the tab packaging body.

In some embodiments, the tab package includes: a tab glue attached to at least one side surface of the tab; wherein, utmost point ear is the lamellar structure, at least one side is: at least one of the two faces of the sheet structure.

In some embodiments, the material of the tab glue comprises one or a combination of the following:

polypropylene PP;

polyethylene PE;

polyester resin PET;

and (3) polyimide PI.

In some embodiments, the tab compound is located on at least a partial region of at least one side of the tab; the thickness of the tab glue is 5-30 microns.

In some embodiments, the width of the tab glue is greater than the width of the tab, and the length of the tab glue is less than the length of the tab;

at least partial area of one end of the tab, which is far away from the electrode plate, is not covered by the tab glue.

In some embodiments, the battery module includes: a battery package; the battery packaging body wraps the multilayer electrode plate.

In some embodiments, the battery package body has an opening, the tab package body is fixed at the opening, and at least a portion of the tab is located outside the battery package body.

In some embodiments, the wound multilayer electrode sheet is formed by synchronously winding a positive electrode sheet and a negative electrode sheet;

the stacked multilayer electrode plate is formed by alternately stacking a positive electrode plate and a negative electrode plate;

a plurality of tabs of the positive electrode plate are fixed together, and a plurality of tabs of the negative electrode plate are fixed together;

and the positive electrode plate and the negative electrode plate are mutually separated.

In some embodiments, the electrode sheet comprises a positive electrode sheet and a negative electrode sheet; the positive electrode plate and the negative electrode plate are distributed in a crossed manner;

the battery module further includes:

a diaphragm; the diaphragm is located between the positive electrode sheet and the negative electrode sheet.

According to a second aspect of the present disclosure, there is provided a method of manufacturing a battery module, the method including:

attaching a tab packaging body to the side surface of each tab of the electrode plate; the edge of the electrode plate is provided with a plurality of tabs;

winding or stacking to form a multilayer electrode plate, wherein the positions of the plurality of tabs are overlapped after winding or stacking;

heating and softening the tab packaging bodies to connect the tab packaging bodies attached to the tabs;

and cooling the tab packaging body to enable the tabs to pass through the tab packaging body to be fixed together.

In some embodiments, the attaching of the tab package to the side surface of each tab of the electrode sheet includes:

and thermoplastic tab glue is attached to the side surface of each tab of the electrode plate.

In some embodiments, the heating softens the tab packages to interconnect the tab packages attached to the plurality of tabs, and includes:

softening the tab package by heating the tab package to between 120 and 160 degrees celsius;

and pressing and bonding the softened tabs, and sealing and fixing the tabs.

In some embodiments, the method further comprises:

wrapping a battery packaging body at the periphery of the electrode plate; wherein the battery package body is provided with an opening, and at least part of the plurality of tabs are positioned outside the battery package body;

and heating the tab packaging body at the opening of the battery packaging body to soften the tab packaging body and hermetically connect the tab packaging body with the opening of the battery packaging body.

In some embodiments, the method further comprises:

forming a plurality of tabs on the edge of the sheet-shaped current collector;

and coating active materials to form the electrode plate in the areas of the sheet-shaped current collector except the areas where the plurality of tabs are formed.

In some embodiments, the coating the active material to form the electrode sheet at the region of the sheet-like current collector other than the region where the plurality of tabs are formed, includes:

coating a compound material containing lithium element on the sheet-shaped current collector in the area except the areas where the tabs are formed to form a positive electrode sheet; and/or the presence of a gas in the gas,

and coating a carbon material on the sheet-shaped current collector in the areas except for the plurality of tabs to form a negative electrode sheet.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: in the technical scheme of the embodiment of the disclosure, the multilayer electrode plate of the battery is provided with a plurality of tabs packaged together. A plurality of utmost point ears are parallelly connected to have less impedance, can increase the charge transmission efficiency of electrode slice, thereby promote the charge-discharge power of battery, promote charge-discharge speed. In addition, with a plurality of utmost point ear encapsulation together, need not weld a plurality of utmost point ears on a big utmost point ear, manufacturing process is simple to saved the space that the welding took, can increase the area of electrode slice under the same battery size, thereby promote battery energy density.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural view illustrating a battery module according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a battery with tab coated tab glue in accordance with an exemplary embodiment;

fig. 3 is a schematic cross-sectional view of a battery cell with tab glue applied to the tabs according to an exemplary embodiment;

fig. 4 is a flowchart illustrating a method of manufacturing a battery module according to an exemplary embodiment;

FIG. 5A is a schematic diagram illustrating a positive electrode sheet and a negative electrode sheet according to an exemplary embodiment;

FIG. 5B is a schematic diagram illustrating an electrode sheet being crimped to form a jellyroll in accordance with one exemplary embodiment;

FIG. 6 is a first schematic diagram of a packaged battery according to an exemplary embodiment;

FIG. 7 is a schematic diagram illustrating a positive substrate having a plurality of tabs in accordance with an exemplary embodiment;

fig. 8 is a schematic view of a plurality of tab stacks after crimping shown in accordance with an exemplary embodiment;

fig. 9 is a schematic view showing a plurality of tabs welded to a large tab in accordance with an exemplary embodiment;

FIG. 10 is a second schematic diagram of a packaged battery according to an exemplary embodiment;

fig. 11 is a schematic diagram illustrating the pre-packaging of a plurality of tabs in accordance with an exemplary embodiment;

FIG. 12 is a third schematic diagram of a packaged battery according to an exemplary embodiment;

FIG. 13 is a block diagram illustrating a physical structure of an electronic device in accordance with an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

Fig. 1 is a schematic structural view illustrating a battery module according to an exemplary embodiment, and as shown in fig. 1, the battery module 100 includes:

a multilayer electrode sheet 110; the multilayer electrode plates are stacked or wound;

a plurality of tabs 120 respectively connected to the edges of the multi-layer electrode sheet 110;

a tab package 130 positioned at least one side surface of the tab 120;

the tabs 120, which are overlapped in position, are fixed together by the tab package 130.

The tab is a raw material of the rechargeable battery, which includes a lithium ion battery, a sodium ion battery, and the like. The tab is commonly used for lithium ion polymer batteries as a metal conductor led out from the positive electrode and the negative electrode of the battery. The battery comprises a positive electrode and a negative electrode, and the tabs are used for leading out the positive electrode and the negative electrode and are connected to the outside of the battery. The portion of the tab external to the battery may then serve as a contact point for the circuit external to the battery. Therefore, the tab is a bridge for charge transmission between the inside and the outside of the battery.

In the embodiment of the present disclosure, the battery module includes a plurality of electrode sheets, and the plurality of electrode sheets may be stacked or may be a roll structure formed by repeatedly winding one electrode sheet. The multi-layer electrode sheet has a plurality of tabs, for example, one tab is included on each layer of electrode sheet or one tab is included on each two-layer electrode sheet. The multiple tabs are positioned at the edges of the multilayer electrode plates and are mutually overlapped in position, and the adjacent tabs are fixed together through the tab packaging body and are mutually and fixedly connected. Here, the tab package may be an adhesive or a connecting member, and may fix a plurality of tabs together in a small space, so as to facilitate subsequent packaging with a component such as a battery case.

So, a plurality of utmost point ears can reduce the impedance of battery module, promote the charge conduction performance between battery module and the external circuit, promote the charge rate of battery. And, need not to weld a plurality of utmost point ears on same big utmost point ear, reduced the occupation of battery space to compare in the battery module with a plurality of utmost point ears welding on same big utmost point ear and promoted the available space of electrode slice, and then promote battery energy density, promote battery capacity.

In some embodiments, the tab package includes: a tab glue attached to at least one side surface of the tab; wherein, utmost point ear is the lamellar structure, at least one side is: at least one of the two faces of the sheet structure.

The tab packaging body can be a liquid or viscous tab glue coated on the outer side of the tab; or solid tab glue is firstly placed on the surface of the tab and then is attached to the surface of the tab after being heated and softened; the solid tab can be glued on the surface of the tab by using sticky glue, and then the tab glue is softened by heating to be adhered on the surface of the tab and connected with other tabs. Fig. 2 is a schematic view of the tab 10 with tab glue 20 attached; fig. 3 is a sectional view of the tab 10 to which the tab paste 20 is attached. In the embodiment of the present disclosure, the tab glue may be attached to the entire side surface of the periphery of the tab, or may be attached to a partial area of the side surface of the periphery of the tab, for example, wrapping a circle around the periphery of the tab, or attaching the tab glue to a surface having another tab in the adjacent direction.

The tab glue can be a thermoplastic material, can be softened on the surface of the tab in a heating state to form a film and is tightly attached to the tab; after cooling and solidification, the two adjacent tabs can be tightly connected together. Each tab is fixed with the adjacent tab in a manner of coating tab glue, so that a plurality of tabs of the electrode plate can be connected to form a large tab. Therefore, the adjacent tabs are fixed by the tab adhesive, so that a small space can be occupied, a good sealing effect can be achieved, no gap exists between the tabs, and the battery is convenient to separate the internal environment and the external environment of the battery after subsequent packaging.

In some embodiments, the material of the tab glue comprises at least one of the following:

polypropylene PP;

polyethylene PE;

polyester resin PET;

and (3) polyimide PI.

The tab glue can be made of one or more of the polymer materials. The polypropylene is colorless, odorless and nontoxic, is a semitransparent solid waxy material, and can resist corrosion at normal temperature. The polypropylene can soften about 155 ℃, therefore, can be about 155 ℃ in the temperature, the polypropylene is with the polypropylene coating on utmost point ear under the state of softening, and the cooling is carried out after connecting two adjacent utmost point ears, then can be so that a plurality of utmost point ears interconnect fixedly.

Polyethylene is also a non-odorous, non-toxic, milky waxy solid that is resistant to most acid and base attacks. The melting point of the polyethylene is 130-145 ℃, so that the polyethylene is melted in the temperature range and then coated on the surfaces of the tabs, and then the two adjacent tabs are connected and cooled, so that the tabs are mutually connected and fixed.

The terylene resin is a milky white or light yellow crystal fixing body, is nontoxic, tasteless and resistant to acid and alkali corrosion. Here, it may be softened at about 100 to 230 degrees celsius. Similar to polypropylene and polyethylene, the composite material is thermoplastic material, and can be coated on the pole lugs at a higher temperature to be used as an adhesive for fixing a plurality of pole lugs.

Polyimide is a high polymer material with good heat resistance, is widely applied to various industrial fields, can be softened under the action of a proper solvent or compounded with other materials, can be used as an adhesive, and can be coated on a tab to fix a plurality of tabs.

Most of the polymer materials have thermoplastic properties, and one or more of the polymer materials can be in a liquid state in a certain temperature range to be used as a binder. The material is used as a tab packaging body to fix a plurality of tabs together, so that the battery module can be conveniently packaged subsequently. In addition, the material has stable property and good corrosion resistance, so that the packaged tab can be protected, and the service life of the battery module is prolonged.

In some embodiments, the tab compound is located on at least a partial region of at least one side of the tab; the thickness of the tab glue is 5-30 microns.

In the disclosed embodiment, an extremely thin tab glue, for example, 5 to 30 μm thick or so, may be attached to the outer surface of the tab. Therefore, the tab glue can not occupy too much space to cause deformation or distortion of the tab, and a plurality of tabs can be packaged and fixed together while the tabs are protected.

In some embodiments, the width of the tab glue is greater than the width of the tab, and the length of the tab glue is less than the length of the tab;

at least partial area of one end of the tab, which is far away from the electrode plate, is not covered by the tab glue.

In the embodiment of the disclosure, the tab glue is a prefabricated rectangular thin solid which can be softened and tightly connected with the adjacent tab after being heated. The width of the tab glue is larger than that of the tab, so that when the tab glue is attached to the surface of the tab, parts of the tab can be exposed from two sides of the tab. Thus, when a plurality of tabs are stacked and have positional deviation, the bonding weakness can be prevented.

In addition, the length of the tab glue is smaller than that of the tab, so that part of the tab can be exposed at one end of the tab, which is far away from the electrode plate, and the tab is electrically connected with an external circuit.

In some embodiments, the battery module includes: a battery package; the battery packaging body wraps the multilayer electrode plate.

In the embodiment of the present disclosure, the battery package is used to isolate the inside of the battery from the outside environment, so that the charge movement inside the battery is not interfered by the outside environment. The battery packaging body needs to wrap and seal the multilayer electrode plates in the battery, so that the internal and external environments of the battery are isolated from each other. In the embodiment of the present disclosure, the battery package body may adopt a hard or soft plastic material, such as an aluminum plastic film. In this disclosed embodiment, the battery module can be soft package lithium ion battery, and the plastic-aluminum membrane can completely cut off the inside and outside environment of battery as soft package lithium ion battery's protection film. The aluminum-plastic film is composed of an outer nylon layer, an adhesive, a middle layer aluminum foil, the adhesive and an inner heat sealing layer, has good separation capability, puncture resistance, electrolyte stability, high temperature resistance and insulativity, can effectively protect the internal structure of the battery, and improves the use safety and the service life of the battery.

In some embodiments, the battery package body has an opening, the tab package body is fixed at the opening, and at least a portion of the tab is located outside the battery package body.

The lug is used for connecting the inside and the outside of the battery and serving as a connecting terminal of an external circuit. Therefore, in the embodiment of the present disclosure, the battery package body has an opening, and the tab may protrude from the opening to the outside of the battery package body. Because the surface of the pole lug is coated with the pole lug packaging body, the battery packaging body can be positioned at the pole lug at the opening and is fixedly connected through the pole lug packaging body. For example, the tab surface is provided with an adhesive to connect and fix a plurality of tabs together, and the adhesive on the outermost tab may be connected with the battery package. If the surface of the tab is provided with solid tab glue, when the tab is placed at the opening of the battery packaging body, the tab glue is heated and softened, and then the tab glue and the opening are properly pressurized to form a sealing structure in tight connection.

In this way, the tab may be fixed to the battery package and the tab package is connected to the battery package, so that the battery may be internally sealed with only the tab exposed to the outside of the battery package.

In some embodiments, the wound multilayer electrode sheet is formed by synchronously winding a positive electrode sheet and a negative electrode sheet;

the stacked multilayer electrode plate is formed by alternately stacking a positive electrode plate and a negative electrode plate;

a plurality of tabs of the positive electrode plate are fixed together, and a plurality of tabs of the negative electrode plate are fixed together;

and the positive electrode plate and the negative electrode plate are mutually separated.

In the embodiment of the present disclosure, the positive electrode sheet and the negative electrode sheet are formed in a multilayer structure by winding, and the positive electrode sheet and the negative electrode sheet are stacked in a crossed manner. That is to say, the positive electrode sheet and the negative electrode sheet are stacked and then curled to surround, so that a multi-layer electrode sheet is formed. If the electrode plates are stacked, the electrode plates are formed by alternately stacking a plurality of positive electrode plates and negative electrode plates, the positive electrode plates are mutually connected in parallel, and the negative electrode plates are mutually connected in parallel. Because positive electrode piece and negative electrode piece alternate segregation, can not switch on between the two, consequently, positive electrode piece and negative electrode piece have a plurality of utmost point ears respectively to interconnect is fixed between a plurality of utmost point ears of positive electrode piece, and interconnect is fixed between a plurality of utmost point ears of negative electrode piece, forms two sets of mutual segregation's utmost point ear. For example, the electrode tabs and the tabs may be integrally formed, electrically connected to each other, and a plurality of tabs may be connected in parallel to each other. The tabs of the positive electrode plate and the negative electrode plate, which are separated from each other, are connected to the outside of the battery module, and can be used as the positive electrode and the negative electrode of the battery to be connected with an external circuit.

In some embodiments, the electrode sheet comprises a positive electrode sheet and a negative electrode sheet; the positive electrode plate and the negative electrode plate are distributed in a crossed manner;

the battery module further includes:

a diaphragm; the diaphragm is located between the positive electrode sheet and the negative electrode sheet.

In the process of manufacturing the battery, the diaphragm is arranged between the positive electrode plate and the negative electrode plate, the positive electrode plate, the diaphragm and the negative electrode plate are stacked, and then the positive electrode plate, the diaphragm and the negative electrode plate are synchronously coiled and encircled into a coil shape, so that a multi-layer electrode plate structure is formed. The stacked structure is formed by alternately stacking a plurality of electrode plates and diaphragms according to the order of the positive electrode plate, the diaphragms and the negative electrode plate.

The separator has a main function of separating the positive electrode and the negative electrode of the battery, preventing the electrodes from contacting each other to cause short circuit, and also has a function of allowing electrolyte ions to pass therethrough. The material of the separator is an insulator material and has a porous structure, and can block the passage of electrons but can pass ions. Therefore, in the process of charging and discharging, conductive ions in the battery can move between two electrodes through the diaphragm, so that the charging and discharging effects are achieved.

Fig. 4 is a schematic flow chart of a method for manufacturing a battery module according to an embodiment of the present disclosure, where the method includes:

step S101, attaching a tab packaging body to the side surface of each tab of an electrode plate; the edge of the electrode plate is provided with a plurality of tabs;

step S102, winding or stacking to form a multilayer electrode plate, wherein the positions of the plurality of tabs are overlapped after winding or stacking;

step S103, heating and softening the tab packaging bodies to connect the tab packaging bodies attached to the tabs;

and step S104, cooling the tab packaging body to enable the plurality of tabs to be fixed together through the tab packaging body.

The battery realizes the functions of storing and releasing charges by electrode plates, and the electrode plates are connected with lugs as parts connected with an external circuit. The edge of the electrode plate is connected with a plurality of tabs which are connected in parallel, so that the impedance can be reduced, and the charge and discharge rate of the battery can be improved.

In the embodiment of the present disclosure, a tab package is attached to a side surface of each tab of the electrode sheet to fix and connect a plurality of tabs. After the electrode sheets are wound or stacked, a multi-layered electrode sheet may be formed. At least one tab can be arranged on different layers of the multi-layer electrode plate respectively, so that a plurality of tabs can be overlapped at the same position. Therefore, the tab packages on the respective tabs are in contact with the adjacent tabs, respectively. And then the tab packages are tightly adhered to the tabs by heating and softening, and the adjacent tabs are connected with each other. Thus, a plurality of tabs can be mutually connected and fixed together. In addition, the heating process can be properly pressurized, so that a plurality of tabs are tightly pressed together and are connected in a sealing manner through the tab packaging body to form a sealed whole. After the tab packaging body is cooled, a plurality of tabs can form a stable integrated structure.

In some embodiments, the attaching of the tab package to the side surface of each tab of the electrode sheet includes:

and thermoplastic tab glue is attached to the side surface of each tab of the electrode plate.

The material of the tab glue can be one or a combination of several of PP, PE, PET and PI mentioned in the above embodiments. These materials have thermoplasticity, are solid at normal temperature, and can be softened or melted by heating to a certain temperature, thereby changing the form. By attaching the tab glue with thermoplasticity on the tab, the tab glue can be softened and a plurality of tabs can be fixedly connected together after being heated.

In some embodiments, the heating softens the tab packages to interconnect the tab packages attached to the plurality of tabs, and includes:

softening the tab package by heating the tab package to between 120 and 160 degrees celsius;

and pressing and bonding the softened tabs, and sealing and fixing the tabs.

The heating softens the tab packaging bodies to connect the tab packaging bodies attached to the plurality of tabs, and the heating softens the tab packaging bodies to each other, and the heating softens the tab packaging bodies to connect the tab packaging bodies to each other, and comprises the following steps:

softening the tab package by heating the tab package to between 120 and 160 degrees celsius;

and pressing and bonding the softened tabs, and sealing and fixing the tabs.

The temperature of the heating tab package body can be determined according to the characteristics of the materials, and by adopting the materials in the above embodiments, the materials can be softened at the temperature of about 120 to 160 ℃, and then the plurality of tabs are tightly connected through compression to be fixed together to form a sealed connection structure.

In some embodiments, the method further comprises:

wrapping a battery packaging body at the periphery of the electrode plate; wherein the battery package body is provided with an opening, and at least part of the plurality of tabs are positioned outside the battery package body;

and heating the tab packaging body at the opening of the battery packaging body to soften the tab packaging body and hermetically connect the tab packaging body with the opening of the battery packaging body.

Because the tab is provided with the tab packaging body, the tab can be heated and pressed at the opening of the battery packaging body, and the tab and the opening are connected and sealed by the tab packaging body, so that a sealing structure with the inside and the outside isolated from each other is formed.

In some embodiments, the method further comprises:

forming a plurality of tabs on the edge of the sheet-shaped current collector;

and coating active materials to form the electrode plate in the areas of the sheet-shaped current collector except the areas where the plurality of tabs are formed.

The current collector refers to a structure for collecting current, and in the lithium ion battery, the current collector mainly refers to metal foil, such as copper foil and aluminum foil. In an embodiment of the present disclosure, a tab is included on the current collector. In the process of charging and discharging, the current collector collects the current generated by the battery active material under the action of an electric field so as to form larger current to be output outwards, and then the current can be output to the outside of the battery through the lug.

In some embodiments, the coating the active material to form the electrode sheet at the region of the sheet-like current collector other than the region where the plurality of tabs are formed, includes:

coating a compound material containing lithium element on the sheet-shaped current collector in the area except the areas where the tabs are formed to form a positive electrode sheet; and/or the presence of a gas in the gas,

and coating a carbon material on the sheet-shaped current collector in the areas except for the plurality of tabs to form a negative electrode sheet.

The active materials are generally classified into a positive active material and a negative active material, and for a lithium ion battery, the positive active material includes: lithium cobaltate, lithium manganate or lithium nickel cobalt manganate and the like; and the negative active material is typically graphite, hard carbon, or soft carbon material, or the like.

Embodiments of the present disclosure also provide the following examples:

the polymer soft package lithium ion battery isolates the internal and external environments of the battery through the packaging of the aluminum plastic film, so that an independent environment is formed inside the battery, and the external interference is prevented. The tab of the battery is used as a conductive device for connecting the internal environment and the external environment of the battery, and the structure and the packaging mode of the tab have great influence on the energy density and the charging and discharging power of the battery.

In some embodiments, as shown in fig. 5A, a tab 430 is welded to each of the positive electrode sheet 410 and the negative electrode sheet 420, and then, as shown in fig. 5B, the positive electrode sheet 410, the separator 440, and the negative electrode sheet 420 are stacked and wound around to form a roll core, and then fixed by the adhesive paper 510. At this time, the batteries share one positive electrode tab and one negative electrode tab.

Then, as shown in fig. 6, the winding core 620 is wrapped by the aluminum-plastic film 610, and the aluminum-plastic film 610 is heat-sealed with the positive and negative electrode tabs (fig. 6 is a side view, only one tab 630 is shown), respectively, to form a final battery structure.

The positive pole and the negative pole of the structure are respectively provided with one tab, so that the ohmic resistance is high, and the charge-discharge rate is influenced. In addition, in the process of charging and discharging, the local current density is high, which easily causes local overheating of the battery, thereby affecting the service life of the battery.

In other embodiments, a multi-tab design is used, and as shown in fig. 7, a plurality of tabs 720 are distributed on the edge of the positive substrate 710. The negative electrode substrates are identical and are provided with a plurality of tabs. The winding core is formed by winding the cell substrate, and as shown in fig. 8, a plurality of tabs 810 of the positive electrode are stacked and a plurality of tabs of the negative electrode are stacked. Then, as shown in fig. 9, a plurality of tabs 810 of the positive electrode are welded to one large tab 910 of the positive electrode, and a plurality of tabs 820 of the negative electrode are welded to one large tab 920 of the negative electrode.

Finally, as shown in fig. 10, the winding core 1020 is wrapped by an aluminum-plastic film 1010, and a welding point 1030 is located inside the aluminum-plastic film, namely a large tab 1040 (only one large tab is shown in fig. 10, including a positive large tab and a negative large tab).

The structure has the advantages that the positive electrode and the negative electrode are respectively provided with a plurality of tabs, the ohmic impedance is small, so that the charging speed can be higher, the current density during charging and discharging is low, and the phenomenon of overheating is not easy to occur. However, this method requires a welding process of a plurality of tabs with one large tab, the manufacturing process is complicated, and the welding area occupies the space inside the battery, so that the area of the electrode tab is reduced, and the energy density of the battery is reduced.

In the disclosed embodiment, a thin tab compound, such as 5 to 30 microns thick tab compound, is encapsulated over the plurality of tabs. The tab glue can be made of one or two of PP, PE, PET and PI. The electrode slice after curling and surrounding enables a plurality of tabs to be stacked at the same position and connected with each other through tab glue, so that the pre-packaging effect is achieved. As shown in fig. 11, a plurality of tabs 1120 may be fixed together by tab paste 1110.

Then, as shown in fig. 12, an aluminum plastic film 1210 is wrapped around the winding core 1220 and fixedly coupled with the tab 1120 by the tab glue 1110, thereby forming a final battery package.

Therefore, the battery is charged and discharged through the plurality of tabs, the charging speed is improved, the current density is low, and the phenomenon of overheating is not easy to occur; meanwhile, a plurality of tabs do not need to be welded on one large tab, so that the space required by the internal welding of the battery is saved, electrode plates with larger areas can be used, and the energy density of the battery is improved.

Fig. 13 is a block diagram illustrating a physical structure of an electronic device 1300 in accordance with an exemplary embodiment. For example, the electronic device 1300 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a gaming console, a tablet device, a medical device, a fitness device, a personal digital assistant, and so forth.

Referring to fig. 13, electronic device 1300 may include one or more of the following components: a processing component 1301, a memory 1302, a power component 1303, a multimedia component 1304, an audio component 1305, an input/output (I/O) interface 1306, a sensor component 1307, and a communication component 1308.

The processing component 1301 generally controls the overall operation of the electronic device 1300, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 1301 may include one or more processors 1310 to execute instructions to perform all or part of the steps of the methods described above. Additionally, processing component 1301 may also include one or more modules that facilitate interaction between processing component 1301 and other components. For example, the processing component 1301 may include a multimedia module to facilitate interaction between the multimedia component 1304 and the processing component 1301.

The memory 1310 is configured to store various types of data to support operations at the electronic device 1300. Examples of such data include instructions for any application or method operating on the electronic device 1300, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 1302 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

The power supply component 1303 provides power to the various components of the electronic device 1300. The power supply component 1303 may include: a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for electronic device 1300. The power module 1303 includes the battery module according to any of the embodiments described above.

The multimedia component 1304 includes a screen that provides an output interface between the electronic device 1300 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 1304 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the electronic device 1300 is in an operating mode, such as a shooting mode or a video mode. Each front camera and/or rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 1305 is configured to output and/or input an audio signal. For example, the audio component 1305 includes a Microphone (MIC) configured to receive external audio signals when the electronic device 1300 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may further be stored in memory 1310 or transmitted via communication component 1308. In some embodiments, the audio component 1305 also includes a speaker for outputting audio signals.

The I/O interface 1306 provides an interface between the processing component 1301 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor component 1307 includes one or more sensors for providing various aspects of status assessment for the electronic device 1300. For example, the sensor assembly 1307 may detect an open/closed state of the electronic device 1300, the relative positioning of components, such as a display and keypad of the electronic device 1300, the sensor assembly 1307 may also detect a change in position of the electronic device 1300 or a component of the electronic device 1300, the presence or absence of user contact with the electronic device 1300, orientation or acceleration/deceleration of the electronic device 1300, and a change in temperature of the electronic device 1300. The sensor assembly 1307 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 1307 may also include a light-sensitive sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1307 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 1308 is configured to facilitate communications between the electronic device 1300 and other devices in a wired or wireless manner. The electronic device 1300 may access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1308 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1308 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, or other technologies.

In an exemplary embodiment, the electronic device 1300 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 1302 comprising instructions, executable by the processor 1310 of the electronic device 1300 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

A non-transitory computer readable storage medium having instructions therein, which when executed by a processor of a mobile terminal, enable the mobile terminal to perform any of the methods provided in the above embodiments.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.