CN219303795U

CN219303795U - Battery cell

Info

Publication number: CN219303795U
Application number: CN202223371107.6U
Authority: CN
Inventors: 洪春林; 纪荣进; 李聪; 陈贤锐; 王诗龙; 陈杰; 郑明清
Original assignee: Zhejiang Liwei Energy Technology Co ltd
Current assignee: Zhejiang Liwei Energy Technology Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-07-04
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a battery, which comprises a battery core, an aluminum plastic film and a pasting component; coating the battery core with an aluminum plastic film; the pasting component comprises a first pasting piece, a second pasting piece and an isolation piece, wherein the first pasting piece, the isolation piece and the second pasting piece are arranged in a lamination mode and are sequentially connected, one side, deviating from the first pasting piece, of the second pasting piece is tightly pasted on the surface of the battery cell, and one side, deviating from the second pasting piece, of the first pasting piece is pasted on the inner surface of the aluminum plastic film. The insulating piece is additionally arranged between the first adhesive piece and the second adhesive piece, so that electrolyte is isolated by the insulating piece after penetrating through the first adhesive piece, and the problem that the adhesiveness between the second adhesive piece and the battery cell is reduced due to the fact that the electrolyte penetrates into the second adhesive piece is avoided.

Description

Battery cell

Technical Field

The utility model relates to the technical field of energy storage devices, in particular to a battery.

Background

At present, the battery bonds a bare cell and an aluminum plastic film through a hot-melt double-sided adhesive tape, so that relative movement is prevented, and further the risk of tearing of an aluminum foil is reduced, and a cell manufacturing process generally comprises the following steps: winding, top side sealing, vacuum baking, electrolyte injection, standing (normal temperature and high temperature), formation and secondary sealing, wherein before the formation process, a hot-melt double-sided adhesive tape is adhered to the surface of a bare cell, and during the formation process, a sufficient pressure and high temperature are utilized to press and cover an aluminum plastic film towards the direction of the cell, so that the aluminum plastic film is adhered to the hot-melt double-sided adhesive tape. However, under the effect of pressure, electrolyte between plastic-aluminum membrane and hot melt double faced adhesive tape is because the pressure effect of plastic-aluminum membrane makes the electrolyte be poured into in the hot melt double faced adhesive tape, and then permeates to the surface of electric core, and the electrolyte that permeates to electric core surface can influence the pasting effect of hot melt double faced adhesive tape and electric core, leads to electric core and plastic-aluminum membrane's fixed insecure.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery, which can improve the bonding firmness between the battery core and the aluminum plastic film.

A battery according to an embodiment of the present utility model includes:

a battery cell;

the aluminum-plastic film coats the battery cell;

the pasting component comprises a first pasting piece, a second pasting piece and an isolation piece, wherein the first pasting piece, the isolation piece and the second pasting piece are arranged in a stacked mode and are sequentially connected, one side, deviating from the first pasting piece, of the second pasting piece is tightly pasted on the surface of the battery cell, and one side, deviating from the second pasting piece, of the first pasting piece is pasted on the inner surface of the aluminum plastic film.

The battery provided by the embodiment of the utility model has at least the following beneficial effects: the insulating piece is additionally arranged between the first adhesive piece and the second adhesive piece, so that electrolyte is isolated by the insulating piece after penetrating through the first adhesive piece, and the problem that the adhesiveness between the second adhesive piece and the battery cell is reduced due to the fact that the electrolyte penetrates into the second adhesive piece is avoided, and the bonding firmness between the battery cell and the aluminum plastic film is improved.

According to some embodiments of the utility model, the first adhesive member has a lower viscosity than the second adhesive member.

According to some embodiments of the utility model, the battery cell comprises a covering part and a containing part, wherein the covering part and the containing part are distributed along the height and/or width direction of the battery cell, the pasting component is attached to the surface of the covering part, and a cavity is arranged between the containing part and the aluminum plastic film and is used for containing electrolyte.

According to some embodiments of the utility model, the material of the insulation is polyethylene or polypropylene.

According to some embodiments of the utility model, the thickness of the insulation is in the range of 1 μm to 2 μm.

According to some embodiments of the utility model, the thickness of the adhesive assembly ranges between 5 μm and 20 μm.

According to some embodiments of the utility model, the first adhesive member and the second adhesive member have the same thickness, and the ratio of the thickness of the first adhesive member to the thickness of the insulating member is between 2 and 4.5.

According to some embodiments of the utility model, the paste assembly is disposed on a side of the cell.

According to some embodiments of the utility model, the adhesive assembly is further disposed on a top surface and/or a bottom surface of the battery cell.

According to some embodiments of the utility model, the first adhesive member and the second adhesive member are each a hot melt double sided adhesive.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic cross-sectional view of a battery according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the cell in FIG. 1;

fig. 3 is a schematic distribution diagram of an adhesive assembly according to an embodiment of the present utility model.

Reference numerals: the battery cell 100, the cover part 110, the accommodating part 120, the aluminum plastic film 200, the adhesive assembly 300, the first adhesive piece 310, the second adhesive piece 320, the insulating piece 330 and the cavity 400.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In some embodiments, referring to fig. 1, a battery includes a cell 100, an aluminum plastic film 200, and a paste assembly 300; the aluminum plastic film 200 coats the battery cell 100; the adhesive assembly 300 includes a first adhesive element 310, a second adhesive element 320 and an insulating element 330, where the first adhesive element 310, the insulating element 330 and the second adhesive element 320 are stacked and sequentially connected, and one side of the second adhesive element 320 facing away from the first adhesive element 310 is adhered to the surface of the battery cell 100, and one side of the first adhesive element 310 facing away from the second adhesive element 320 is adhered to the inner surface of the plastic-aluminum film 200.

It should be noted that, the conventional battery processing flow is: a first step of attaching the second adhesive member 320 on the adhesive assembly 300 to the surface of the battery cell 100; secondly, wrapping the battery cell 100 with the aluminum plastic film 200; thirdly, electrolyte is injected into the battery (namely between the battery cell 100 and the aluminum plastic film 200); fourth, the aluminum plastic film 200 is pressed against the first adhesive member 310 by pressure and high temperature, so that the first adhesive member 310 is tightly attached to the aluminum plastic film 200.

In the process of attaching the first adhesive member 310 to the plastic-aluminum film 200, the electrolyte between the plastic-aluminum film 200 and the first adhesive member 310 is separated into a direction parallel to the inner surface of the plastic-aluminum film 200, which spreads around the pressed portion, and a direction of the plastic-aluminum film 200 toward the first adhesive member 310, which penetrates into the first adhesive member 310, and thus into the second adhesive member 320, due to the pressure, and affects the adhesion between the second adhesive member 320 and the battery cell 100.

In this embodiment, a layer of insulating member 330 is added between the first adhesive member 310 and the second adhesive member 320, and the electrolyte is isolated by the insulating member 330 after passing through the first adhesive member 310, so as to avoid the problem of reduced adhesion between the second adhesive member 320 and the battery cell 100 caused by the electrolyte penetrating into the second adhesive member 320, thereby improving the adhesion between the battery cell 100 and the plastic-aluminum film 200.

It will be appreciated that the attachment between the barrier 330 and the first attachment member 310 may be accomplished by: the first adhesive member 310 is heated to activate its tackiness, and then is adhered to the insulating member 330, and after both are adhered, the first adhesive member 310 is dried to reduce its tackiness.

Since the second adhesive member 320 needs to be adhered to the surface of the battery cell 100 in the first step of the battery processing procedure, it is necessary to ensure that the viscosity of the second adhesive member 320 is high, so as to ensure that the second adhesive member can be smoothly adhered to the surface of the battery cell 100; in the process of coating the battery cell 100 with the plastic-aluminum film 200, the first adhesive member 310 is easily stained with more dust, so that the adhesion capability of the plastic-aluminum film 200 is reduced, and thus, in some embodiments, the adhesion of the first adhesive member 310 is less than that of the second adhesive member 320. In the process of coating the battery cell 100 with the plastic-aluminum film 200, the first adhesive member 310 is less in viscosity, so that dust adhering to the plastic-aluminum film during the process can be reduced.

Specifically, the material composition of the first adhesive member 310 has a tackifying resin content of between 4% and 6%, so as to ensure that the first adhesive member 310 has low tackiness before the fourth step in the battery processing flow; the material composition of the second adhesive member 320 has a tackifying resin content of 29-31%, so that the second adhesive member 320 can have high viscosity in the first step of the battery processing procedure to be adhered to the surface of the battery cell 100.

It will be appreciated that the high temperature and the pressure imparted between the first adhesive member 310 and the plastic-aluminum film 200 during the pressing of the plastic-aluminum film 200 and the first adhesive member 310 using the high pressure and the high temperature can activate the adhesiveness of the first adhesive member 310, thereby adhering the first adhesive member 310 to the plastic-aluminum film 200.

In some embodiments, referring to fig. 1 and 2, the battery cell 100 includes a cover portion 110 and a receiving portion 120, the cover portion 110 and the receiving portion 120 are distributed along a height and/or width direction of the battery cell 100, the adhesive assembly 300 is attached to a surface of the cover portion 110, and a cavity 400 is provided between the receiving portion 120 and the plastic-aluminum film 200, and the cavity 400 is used for receiving an electrolyte. In the fourth step of the battery process flow, the above arrangement allows the electrolyte, which spreads around in the pressed place toward the direction parallel to the inner surface of the plastic-aluminum film 200, to remain in the cavity 400.

In some embodiments, the material of the separator 330 is polyethylene or polypropylene, and the use of polypropylene or polyethylene as the material of the separator 330 can enable the overall thickness of the separator 330 to be controlled to a lower level, thereby reducing the overall thickness of the battery; on the other hand, polyethylene has the characteristics of corrosion resistance and good electrical insulation; the polypropylene has the characteristics of good electrical insulation and no influence of humidity.

Preferably, in some embodiments, the thickness of the separator 330 is in the range of 1 μm to 2 μm, which is to ensure that electrolyte cannot penetrate from the first adhesive member 310 to the second adhesive member 320 and to reduce the overall thickness of the battery as much as possible.

In some embodiments, the thickness of the applicator assembly 300 ranges between 5 μm and 20 μm. In the case of a high requirement for the thickness of the battery, the thickness of the adhesive assembly 300 may be set to be small, for example: the thickness of the adhesive assembly 300 is set to 5 μm to reduce the overall thickness of the battery; when the thickness requirement of the battery is low, the thickness of the adhesive assembly 300 may be set to be high, for example: the thickness of the paste assembly 300 is set to 20 μm, so that the difficulty in production of the paste assembly 300 can be reduced.

In some embodiments, the thickness of the first and

second stickers

310, 320 are the same, and the ratio of the thickness of the first sticker 310 to the thickness of the insulator 330 is between 2-4.5.

Specifically, the thickness ratio between the first adhesive member 310, the second adhesive member 320 and the insulating member 330 in the insulating member 330 is 40%, 20%, and the ratio of the thickness of the first adhesive member 310 to the thickness of the insulating member 330 is 2. The thickness ratio between the first adhesive member 310, the second adhesive member 320 and the insulating member 330 in the insulating member 330 was 45%, 10%, and the ratio of the thickness of the first adhesive member 310 to the thickness of the insulating member 330 was 4.5.

In the case of more electrolyte in the battery, the thickness ratio of the insulating member 330 can be increased according to actual needs, so that the electrolyte in the first adhesive member 310 can be better insulated; in the case of less electrolyte in the battery, the thickness ratio of the insulating member 330 can be reduced according to actual needs, so that the first adhesive member 310 and the plastic-aluminum film 200, and the second adhesive member 320 and the surface of the battery cell 100 can have higher adhesion firmness. That is, the ratio of the thickness of the first adhesive member 310 to the thickness of the insulating member 330 is 2-4.5, which can not only prevent the electrolyte from penetrating from the first adhesive member 310 to the second adhesive member 320, but also ensure high adhesion between the first adhesive member 310 and the plastic-aluminum film 200, and between the second adhesive member 320 and the surface of the cell 100.

In some embodiments, referring to fig. 1 and 2, the adhesive assembly 300 is disposed on the side of the battery cell 100, and for the battery configuration, the side area of the battery cell 100 is generally larger than the bottom area and the top area, so that the adhesive assembly 300 is disposed on the side of the battery cell 100 to ensure the adhesion between the battery cell 100 and the plastic-aluminum film 200.

In some embodiments, referring to fig. 3, the adhesive assembly 300 is further disposed on the top surface and/or the bottom surface of the battery cell 100, so that the adhesion between the battery cell 100 and the plastic-aluminum film 200 can be further improved.

Specifically, the side and top surfaces of the battery cell 100 are provided with the adhesive assembly 300, or the side and bottom surfaces of the battery cell 100 are provided with the adhesive assembly 300, or the side, bottom, and top surfaces of the battery cell 100 are provided with the adhesive assembly 300.

In some embodiments, the first adhesive member 310 and the second adhesive member 320 are both hot-melt double-sided adhesive, and the use of hot-melt double-sided adhesive material for the first adhesive member 310 ensures that the opposite sides of the first adhesive member 310 can be adhered to the aluminum plastic film 200 and the insulating member 330, respectively; the use of the hot melt double sided adhesive material for the second adhesive member 320 ensures that opposite sides of the second adhesive member 320 are adhered to the surface of the battery cell 100 and the insulating member 330, respectively.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.

Claims

1. A battery, comprising:

a battery cell;

the aluminum-plastic film coats the battery cell;

2. The battery of claim 1, wherein the first adhesive member has a viscosity less than a viscosity of the second adhesive member.

3. The battery according to claim 1, wherein the electric core comprises a covering part and a containing part, the covering part and the containing part are distributed along the height and/or width direction of the electric core, the pasting component is attached to the surface of the covering part, and a cavity is arranged between the containing part and the aluminum plastic film and is used for containing electrolyte.

4. The battery of claim 1, wherein the separator material is polyethylene or polypropylene.

5. The battery of claim 1, wherein the separator has a thickness in the range of 1 μm to 2 μm.

6. The battery of claim 1, wherein the thickness of the adhesive assembly ranges between 5 μιη and 20 μιη.

7. The battery of claim 1, wherein the first adhesive member and the second adhesive member have the same thickness, and wherein the ratio of the thickness of the first adhesive member to the thickness of the separator is between 2 and 4.5.

8. The battery of claim 1, wherein the adhesive assembly is disposed on a side of the cell.

9. The battery of claim 8, wherein the adhesive assembly is further disposed on a top and/or bottom surface of the cell.

10. The battery of claim 1, wherein the first adhesive member and the second adhesive member are each a hot melt double sided adhesive.