阅读说明：本技术 一种锂离子电池盖板、电池及其制造方法 (Lithium ion battery cover plate, battery and manufacturing method thereof ) 是由 靳建明 于 2021-07-30 设计创作，主要内容包括：本申请涉及一种锂离子电池盖板、电池及其制造方法,本申请的锂离子电池盖板包括：第一端板、第一胶层、基板、第二胶层、第二端板和导通体；其中,第一胶层设于第一端板的下表面；基板设于第一胶层的下表面；第二胶层设于基板的下表面；第二端板设于第二胶层的下表面；第一胶层与基板和第二胶层均为环形结构,形成缓存腔,导通体设于缓存腔内。本申请的锂离子电池盖板的第一端板和第二端板之间采用双面胶接的密封方式,比传统单面胶结的密封方式所需的密封空间更小,具有更可靠的密封性能,其结构比单面胶接结构具有更高的强度和稳定性。(The application relates to a lithium ion battery cover plate, a battery and a manufacturing method thereof, wherein the lithium ion battery cover plate comprises: the conductive connector comprises a first end plate, a first glue layer, a substrate, a second glue layer, a second end plate and a conductive body; the first glue layer is arranged on the lower surface of the first end plate; the substrate is arranged on the lower surface of the first adhesive layer; the second adhesive layer is arranged on the lower surface of the substrate; the second end plate is arranged on the lower surface of the second adhesive layer; the first adhesive layer, the substrate and the second adhesive layer are of annular structures, a buffer cavity is formed, and the conducting body is arranged in the buffer cavity. The utility model provides a sealing method that adopts two-sided cementing between the first end plate of lithium ion battery apron and the second end plate, it is littleer than the required sealed space of sealing method of traditional single face cementing, has more reliable sealing performance, and its structure has higher intensity and stability than single face cementing structure.)

1. A lithium ion battery cover plate, comprising:

a first end plate;

the first glue layer is arranged on the lower surface of the first end plate;

the substrate is arranged on the lower surface of the first adhesive layer;

the second adhesive layer is arranged on the lower surface of the substrate;

the second end plate is arranged on the lower surface of the second glue layer; and

the first glue film with the base plate with the second glue film is the loop configuration, forms the buffer memory chamber, the conduction body is located the buffer memory intracavity.

2. The lithium ion battery cover of claim 1, further comprising:

and the pressure relief explosion-proof groove is arranged on the upper surface of the second end plate.

3. The lithium ion battery cover plate of claim 2, wherein the pressure relief explosion-proof groove is of an annular structure, the outer diameter of the pressure relief explosion-proof groove is larger than the outer diameter of the conducting body, and the inner diameter of the pressure relief explosion-proof groove is smaller than the inner diameter of the second adhesive layer.

4. The lithium ion battery cover plate of claim 1, wherein the first glue layer, the substrate, and the second glue layer have equal inner diameters, and the inner diameter of the second glue layer is greater than the outer diameter of the via.

5. The lithium ion battery cover plate of claim 1, wherein the first glue layer and the second glue layer have an equal outer diameter, and the second glue layer has an outer diameter that is smaller than the outer diameter of the substrate.

6. The lithium ion battery cover plate of claim 1, wherein an axis of the first glue layer, an axis of the base plate, and an axis of the second glue layer coincide.

7. The lithium ion battery cover plate of claim 1, wherein the first end plate and the second end plate are shaped and configured in a uniform manner.

8. The lithium ion battery cover plate of claim 7, wherein an axis of the first end plate and an axis of the second end plate coincide.

9. A battery comprising a case, an electrode group, a tab, and the lithium ion battery cover plate of any one of claims 1 to 8;

the lithium ion battery cover plate is arranged on the shell;

the electrode group is arranged in the shell;

the tab is arranged on the electrode group.

10. A method of manufacturing a battery cover plate, comprising:

arranging the first glue layer on the first end plate;

covering a substrate on the first adhesive layer, wherein the substrate and the first adhesive layer are both in an annular structure;

carrying out hot gluing treatment and cooling treatment on the first end plate, the first glue layer and the substrate to fix the first end plate, the first glue layer and the substrate;

arranging a second glue layer on the second end plate, wherein the second glue layer is of an annular structure;

placing a conducting body in the hollow parts of the substrate and the first glue layer;

covering the second end plate provided with the second glue layer on the conducting body;

carrying out hot gluing treatment and cooling treatment on the second end plate, the second glue layer and the base plate to fix the second end plate, the second glue layer and the base plate;

and welding two ends of the conduction body with the first end plate and the second end plate respectively.

Technical Field

The application relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cover plate, a battery and a manufacturing method of the battery.

Background

Lithium ion batteries, especially button-type structures, adopt a combined riveting structure of upper and lower half shells similar to a one-time button/button battery, and at present, many domestic manufacturers turn to the development of a combined welding structure of 'cover plate + shell', and the structure comprises a traditional riveting structure, a laminated adhesive structure and the like. The traditional riveting sealing structure has the problems of structural strength and sealing reliability, and the traditional riveting sealing structure needs to be provided with larger thickness; the sealing effect of a sealing ring in the traditional riveting cover plate is gradually reduced and the reliability is reduced due to temperature aging and other reasons in the use process; in the laminated adhesive structure, the adhesive layer is used as both sealant and structural adhesive, and in order to reduce the thickness of the structure, the adhesive layer is generally arranged to be thinner, but the sufficient adhesive strength is difficult to ensure.

In addition, in order to provide a PTC (current temperature control device), a CID (current blocking device), and a VENT (voltage relief explosion protection device), a conventional large-battery-riveting cap plate must sacrifice a sufficient height space, and in a micro-miniature battery structure, it is difficult to sufficiently secure the safety performance of a battery because it is difficult to provide one or more of them due to space limitations.

Disclosure of Invention

The purpose of the application is to provide a lithium ion battery cover plate, a battery and a manufacturing method thereof, and the sealing performance and the structural strength of the manufactured lithium ion battery cover plate are improved.

The embodiment of the application is realized as follows:

in a first aspect, the present application provides a lithium ion battery cover plate, comprising: the conductive connector comprises a first end plate, a first glue layer, a substrate, a second glue layer, a second end plate and a conductive body; the first glue layer is arranged on the lower surface of the first end plate; the substrate is arranged on the lower surface of the first adhesive layer; the second adhesive layer is arranged on the lower surface of the substrate; the second end plate is arranged on the lower surface of the second adhesive layer; the first adhesive layer, the substrate and the second adhesive layer are of annular structures, a buffer cavity is formed, and the conducting body is arranged in the buffer cavity.

In one embodiment, the lithium ion battery cover further includes: and the pressure relief explosion-proof groove is arranged on the upper surface of the second end plate.

In an embodiment, the pressure relief explosion-proof groove is of an annular structure, an outer diameter of the pressure relief explosion-proof groove is larger than an outer diameter of the conducting body, and an inner diameter of the pressure relief explosion-proof groove is smaller than an inner diameter of the second adhesive layer.

In one embodiment, the inner diameters of the first adhesive layer, the substrate and the second adhesive layer are equal, and the inner diameter of the second adhesive layer is larger than the outer diameter of the conductive body.

In one embodiment, the outer diameters of the first adhesive layer and the second adhesive layer are equal, and the outer diameter of the second adhesive layer is smaller than the outer diameter of the substrate.

In one embodiment, the axis of the first glue layer, the axis of the substrate and the axis of the second glue layer are coincident.

In one embodiment, the first end plate and the second end plate have the same shape and structure.

In one embodiment, the axis of the first end plate and the axis of the second end plate coincide.

In a second aspect, the present application provides a battery comprising a case, an electrode assembly, a tab, and the lithium ion battery cover plate of any of the above embodiments; the lithium ion battery cover plate is arranged on the shell; the electrode group is arranged in the shell; the tab is arranged on the electrode group.

In a third aspect, the present application provides a method for manufacturing a battery cover plate, including:

arranging the first glue layer on the first end plate;

covering a substrate on the first adhesive layer, wherein the substrate and the first adhesive layer are both in an annular structure;

carrying out hot gluing treatment and cooling treatment on the first end plate, the first glue layer and the substrate to fix the first end plate, the first glue layer and the substrate;

arranging a second glue layer on the second end plate, wherein the second glue layer is of an annular structure;

placing a conducting body in the hollow parts of the substrate and the first glue layer;

covering the second end plate provided with the second adhesive layer on the conducting body;

carrying out hot gluing treatment and cooling treatment on the second end plate, the second glue layer and the substrate to fix the second end plate, the second glue layer and the substrate;

and welding two ends of the conduction body with the first end plate and the second end plate respectively.

Compared with the prior art, the beneficial effect of this application is: the first end plate and the second end plate of the lithium ion battery cover plate are sealed in a double-sided gluing mode, and the space utilization rate is higher than that of a traditional single-sided gluing sealing mode; the double-sealing structure is adopted, so that the sealing performance of the cover plate is improved; the double-sided symmetrical glue joint structure has higher strength and stability than a single-sided glue joint structure, and the safety performances of current blocking, pressure relief, explosion prevention and the like are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic diagram of a battery structure according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a lithium ion battery cover plate according to an embodiment of the present application.

Fig. 3 is a schematic flow chart illustrating a method for manufacturing a battery cover plate according to an embodiment of the present disclosure.

Icon:

1-a battery; 11-a lithium ion battery cover plate; 12-a housing; 13-electrode set; 14-a tab; 100-a first end plate; 200-a first glue layer; 300-a substrate; 400-a second glue layer; 500-a second end plate; 510-pressure relief explosion-proof groove; 600-a via; 700-cache cavity.

Detailed Description

The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a battery 1 according to an embodiment of the present disclosure. A battery 1 includes a lithium ion battery cover 11, a case 12, an electrode group 13, and tabs 14. The lithium ion battery cover 11 is provided on the case 12, and the lithium ion battery cover 11 is welded to the opening of the case by laser welding, resistance welding, ultrasonic welding, or the like, thereby forming an external support and seal structure of the battery 1. The electrode group 13 is provided in the case 12, and the tab 14 is provided on the electrode group 13.

Fig. 2 is a schematic structural diagram of a lithium ion battery cover 11 according to an embodiment of the present disclosure. A lithium ion battery cover plate 11 comprising: the package structure includes a first end plate 100, a first glue layer 200, a substrate 300, a second glue layer 400, a second end plate 500, and a via 600. The first adhesive layer 200 is disposed on the lower surface of the first end plate 100; the substrate 300 is arranged on the lower surface of the first adhesive layer 200; the second adhesive layer 400 is disposed on the lower surface of the substrate 300; the second end plate 500 is arranged on the lower surface of the second glue layer 400; the first adhesive layer 200, the substrate 300 and the second adhesive layer 400 are all in a ring structure to form a buffer cavity 700, and the conductive body 600 is disposed in the buffer cavity 700.

In an embodiment, a pressure relief explosion-proof groove 510 is further disposed on the upper surface of the second end plate 500, the pressure relief explosion-proof groove 510 is located at the bottom of the buffer cavity 700, the pressure relief explosion-proof groove 510 is an annular structure, an outer diameter of the pressure relief explosion-proof groove 510 is greater than an outer diameter of the conductive body 600, and an inner diameter of the pressure relief explosion-proof groove 510 is smaller than an inner diameter of the second adhesive layer 400.

The material of the first end plate 100 may be metal such as aluminum, iron, nickel, and alloys thereof, and the processing method may be stamping, machining, powder metallurgy, and the like. In an embodiment, the first end plate 100 is preferably made of a stainless steel iron-based alloy material with high strength and rigidity, and is formed by stamping and machining to ensure the overall structural strength and stability of the lithium ion battery cover plate 11. The surface of the first end plate 100 may be treated to increase the adhesive bonding performance according to the size and application of the battery 1 and the material of the adhesive used.

The first adhesive layer 200 may be made of non-metal adhesive materials such as epoxy resin, Polypropylene (PP), Polyethylene (PE), and acrylic acid, and the processing method may be pressing, screen printing, and the like. The first adhesive layer 200 serves to connect the first end plate 100 and the base plate 300, and provides sufficient connection strength, sealing performance, and insulation. In an embodiment, the material of the first adhesive layer 200 is preferably a single-component Polypropylene (PP) semi-solid adhesive film, and is formed by die cutting.

The substrate 300 may be made of metal such as aluminum, iron, nickel, or an alloy thereof, and may be processed by stamping, machining, powder metallurgy, or the like. In one embodiment, the substrate 300 is preferably made of a stainless steel iron-based alloy with high strength and rigidity, and is formed by stamping and machining to ensure the overall structural strength and stability of the lithium ion battery cover 11. The surface of the substrate 300 may be treated to increase the adhesive bonding performance according to the size and application of the battery 1 and the material of the adhesive used.

The second adhesive layer 400 may be made of epoxy resin, PP, PE, acrylic acid, or other non-metal adhesive materials, and the processing method may be pressing, screen printing, or the like. The second adhesive layer 400 is used to connect the substrate 300 and the second terminal plate 500, and provides sufficient connection strength, sealing performance, and insulation. In an embodiment, the material of the second adhesive layer 400 is preferably an epoxy resin semi-solid adhesive film, and is formed by die cutting.

The second end plate 500 may be made of aluminum, iron, nickel, and other metals and alloys thereof, and may be processed by stamping, machining, powder metallurgy, and the like. In an embodiment, the material of the second end plate 500 is preferably aluminum or aluminum alloy with moderate strength and rigidity, so as to facilitate the manufacturing process and the pressure relief operation of the pressure relief explosion-proof groove 510 on the second end plate 500, and the second end plate 500 is formed by stamping and machining. The surface of the second end plate 500 may be treated to increase the adhesive bonding performance according to the size and use of the battery 1 and the material of the adhesive used.

The conductive body 600 may be made of a PTC functional material (PTC, i.e. a Positive Temperature Coefficient, which refers to a semiconductor material or a device with a large Positive Temperature Coefficient), and may be made of a metal such as aluminum, iron, copper, nickel, or an alloy thereof, or a conductive metal material with a non-PCT function such as aluminum, iron, copper, nickel, or the like. The shape of the elastic sheet structure may be in an elastic sheet structure, and the elastic sheet structure elastically contacts the first end plate 100 and the second end plate 500 by the elasticity of the elastic sheet structure. The conductive body 600 may be formed by pressing, machining, or the like. The main function of the conductive via 600 is to electrically connect the first terminal plate 100 and the second terminal plate 500, which is a necessary path for the current of the battery 1. The conductive member 600 can rapidly increase the internal resistance when the large current discharge temperature rises such as a short circuit of the battery 1, thereby preventing the battery 1 from continuously discharging large current. In one embodiment, the conductive body 600 is preferably made of a PTC functional material, and is formed by stamping and machining.

In one embodiment, the battery 1 operates according to the following principle: under normal charging and discharging conditions of the battery 1, current flows through the tab 14, the lower surface edge of the second end plate 500, the central portion of the second end plate 500, the conductor 600, and the first end plate 100 in this order.

In one embodiment, the electrolyte blocking principle: a buffer chamber 700 for buffering a small amount of electrolyte is arranged between the first end plate 100, the base plate 300 and the glue sealing area of the second end plate 500. The buffer chamber 700 may be a hollow chamber or a foam or asbestos material filled with a small amount of electrolyte. When the battery 1 fails after long-term use, a small amount of electrolyte leaks along the inside gluing and sealing path of the lithium ion battery cover plate 11, and the small amount of electrolyte can be cached in the cache cavity 700, so that the electrolyte is prevented from further leaking continuously, and the sealing structure of the lithium ion battery cover plate 11 has higher durability and reliability.

In one embodiment, the principle of pressure relief, explosion prevention and current blocking is as follows: when the internal air pressure of the battery 1 rises, the air pressure pushes the central part of the pressure relief explosion-proof groove 510 on the second end plate 500 to deform outwards, when the internal air pressure rises to the strength threshold value of the pressure relief explosion-proof groove 510, the second end plate 500 breaks at the pressure relief explosion-proof groove 510, and at the moment, the central part of the pressure relief explosion-proof groove 510, the conducting body 600 and the first end plate 100 fall off outwards integrally, so that an exhaust channel from inside to outside of the battery 1 is formed. When the battery 1 is subjected to the pressure relief and explosion-proof actions, the center part of the second end plate 500 is broken and separated at the pressure relief and explosion-proof groove 510, so that a current channel from inside to outside of the battery 1 is blocked, and dangers such as combustion, explosion and the like caused by continuous charging and discharging when the battery 1 is abnormally used are prevented.

In one embodiment, when the conductive body 600 is made of a PTC functional material, the current temperature control operation principle is as follows: when the battery 1 is charged and discharged with a large current exceeding the normal use range, the temperature of the entire battery 1 is abnormally increased. When the temperature of the conductive body 600 rises to the threshold value, the resistance of the conductive body 600 is rapidly increased, so that the continuous rapid rise of the temperature of the battery 1 is effectively inhibited, the loop current of the battery 1 is rapidly reduced, and the danger of burning, explosion and the like of the battery 1 caused by the overhigh temperature is effectively inhibited.

In one embodiment, the inner diameters of the first glue layer 200, the substrate 300 and the second glue layer 400 are all equal, and the inner diameter of the second glue layer 400 is greater than the outer diameter of the via 600. The lithium ion battery cover plate 11 in this embodiment uses the substrate 300 as a supporting main structure, and the first adhesive layer 200 and the second adhesive layer 400 with the same inner diameter are disposed to glue and connect the first end plate 100 and the second end plate 500, so that the structure can provide higher structural strength and stability than a single-sided glue structure while ensuring reliable sealing performance.

In one embodiment, the outer diameters of the first glue layer 200 and the second glue layer 400 are equal, and the outer diameter of the second glue layer 400 is smaller than the outer diameter of the substrate 300. In the embodiment, the first adhesive layer 200 and the second adhesive layer 400 with the same outer diameter are used for the lithium ion battery cover plate 11, and the first end plate 100 and the second end plate 500 are sealed by double-sided adhesive bonding, which has more reliable sealing performance than the conventional single-sided adhesive bonding.

In one embodiment, the axis of the first glue layer 200, the axis of the substrate 300 and the axis of the second glue layer 400 are coincident.

In one embodiment, the first end plate 100 and the second end plate 500 have the same shape and structure, and the axis of the first end plate 100 coincides with the axis of the second end plate 500. With such a structure, the strength and stability of the entire structure of the lithium ion battery cover plate 11 can be ensured.

Fig. 3 is a schematic flow chart illustrating a method for manufacturing a battery cover plate according to an embodiment of the present application. A manufacturing method of a battery cover plate is used for manufacturing a lithium ion battery cover plate 11 shown in figure 1, and comprises the following specific steps:

step S210: the first adhesive layer 200 is disposed on the first end plate 100.

The first end plate 100 made of a stainless steel-based alloy material is punched and machined to form the first end plate 100 having a circular structure. The surface of the first end plate 100 is uniformly coated with the first glue layer 200 made of polypropylene glue joint material, and the middle part of the first glue layer 200 is in an annular space during coating.

Step S220: the substrate 300 is covered on the first adhesive layer 200, wherein the substrate 300 and the first adhesive layer 200 are both in a ring structure.

The substrate 300 made of the stainless steel iron-based alloy material is pre-punched and processed into the annular substrate 300 with the middle part of an annular structure, the inner diameter of the substrate 300 is equal to the inner diameter of the first glue layer 200, the annular substrate 300 is covered on the first glue layer 200, and the substrate 300 can be lightly knocked to make the surface of the substrate 300 fully contact with the first glue layer 200.

Step S230: the first end plate 100, the first adhesive layer 200, and the base plate 300 are subjected to a heat gluing process and a cooling process, so that the first end plate 100, the first adhesive layer 200, and the base plate 300 are fixed.

The first end plate 100, the first adhesive layer 200 and the base plate 300 are thermally bonded under certain temperature and pressure conditions, and the temperature, pressure and thermal bonding time can be determined according to specific process requirements and the material of the first adhesive layer 200. After the thermal gluing process is completed, cooling is performed to fully fix and glue the first end plate 100, the first glue layer 200 and the substrate 300. The cooling time and temperature are determined according to the specific process requirements.

Step S240: the second adhesive layer 400 is disposed on the second end plate 500, and the second adhesive layer 400 is in an annular structure.

In the same manner as the first adhesive layer 200 is disposed on the first end plate 100, the second adhesive layer 400 made of epoxy resin material is uniformly coated on the surface of the second end plate 500, and the middle part of the second adhesive layer 400 is surrounded during coating. During manufacturing, the axes of the first glue layer 200, the substrate 300 and the second glue layer 400 are ensured to be coincident.

Step S250: the conductive body 600 is placed in the hollow portion of the substrate 300 and the first paste layer 200.

The conductive body 600 made of the ceramic composite material is placed in the buffer cavity 700 formed by the substrate 300 and the hollow part of the first glue layer 200.

Step S260: the second end plate 500 provided with the second paste layer 400 is covered on the via 600.

The second end plate 500 made of aluminum alloy is punched and machined in advance to form a circular structure consistent with the shape and structure of the first end plate 100, and the middle parts of the first glue layer 200 and the second glue layer 400 are both in an annular structure and can contain the conduction body 600. The second end plate 500 provided with the second glue layer 400 is covered on the conduction body 600, so that the axes of the second end plate 500 and the first end plate 100 are overlapped and aligned up and down, and the stability of the whole structure is ensured.

Step S270: the second end plate 500, the second paste layer 400, and the base plate 300 are subjected to a thermal gluing process and a cooling process, so that the second end plate 500, the second paste layer 400, and the base plate 300 are fixed.

The same method as that in step S230 is adopted to perform the thermal gluing process on the second end plate 500, the second glue layer 400 and the substrate 300 under certain temperature and pressure conditions, and the temperature, pressure and time of the thermal gluing process can be determined according to specific process requirements and the material of the second glue layer 400. After the thermal bonding process is completed, cooling is performed to sufficiently fix and bond the second end plate 500, the second adhesive layer 400 and the substrate 300. The cooling time and temperature are determined according to the specific process requirements.

The whole structure of the cooled lithium ion battery cover plate 11 is finely polished, so that the inner diameters of the first adhesive layer 200, the substrate 300 and the second adhesive layer 400 are equal, meanwhile, the first adhesive layer 200 and the second adhesive layer 400 are polished, so that the outer diameters of the first adhesive layer 200 and the second adhesive layer 400 are equal, the outer diameter of the second adhesive layer 400 is smaller than that of the substrate 300, and the inner diameter of the second adhesive layer 400 is larger than that of the conducting body 600.

Step S280: both ends of the via 600 are welded to the first and second end plates 100 and 500, respectively.

After the thermal gluing process, the conductive body 600 is wrapped in the first end plate 100 and the second end plate 500, one end of the conductive body 600 is welded with the surface of the first end plate 100, and the other end of the conductive body 600 is welded with the surface of the second end plate 500 in a laser welding, resistance welding or ultrasonic welding mode, so that the conductive body 600 is electrically communicated with the first end plate 100 and the second end plate 500, and a necessary path for the current of the battery 1 is formed. When welding, the first end plate 100 and the second end plate 500 are aligned up and down, and the misalignment is not generated as much as possible.

The selection of different thicknesses and materials of each structure in the lithium ion battery cover plate 11 is related to the overall strength, rigidity, sealing performance, pressure relief, explosion prevention pressure and other characteristics of the lithium ion battery cover plate 11. In one embodiment, the thickness ranges of the various structures in the lithium ion battery cover plate 11 are determined according to the actual manufacturing process requirements of the lithium ion battery cover plate 11 as follows:

the thickness of the first end plate 100 is less than 0.2 mm;

the thickness of the first adhesive layer 200 is less than 0.2 mm;

the thickness of the substrate 300 is less than 0.5 mm;

the thickness of the second adhesive layer 400 is less than 0.2 mm;

the thickness of the second end plate 500 is less than 0.2 mm;

the thickness of the conducting body 600 is less than 1 mm;

the whole thickness of the lithium ion battery cover plate 11 is less than 1 mm.

The above steps are performed to stack and assemble each structure in the lithium ion battery cover plate 11, and the stacking and assembling relationship is related to the hot pressing process and the process requirement for processing the lithium ion battery cover plate 11. A single-piece hot-pressing process can be selected, so that the automatic production is facilitated, the hot-pressing time is reduced, and the manufacturing efficiency is improved; and a plurality of hot pressing processes can be selected, so that the hot pressing time is prolonged, the bonding strength and the sealing durability of the lithium ion battery cover plate 11 are improved, and the manufacturing efficiency is ensured.

The battery 1 formed by combining the lithium ion battery cover plate 11 manufactured by the method and the shell 12 can provide a current temperature control function, a current blocking function and a pressure relief explosion-proof function, so that the battery 1 has higher safety performance in the use process.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.