CN216488411U

CN216488411U - Battery and battery pack

Info

Publication number: CN216488411U
Application number: CN202122772692.XU
Authority: CN
Inventors: 刘聪毅; 张勇杰; 齐彬伟; 赵炎; 杜国艺; 李国伟
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-05-10
Anticipated expiration: 2031-11-12

Abstract

The utility model relates to the technical field of batteries and provides a battery and a battery pack. The battery includes: a cover plate assembly; the battery comprises a battery cell, wherein the battery cell comprises a battery cell main body and a lug, the lug extends out of the battery cell main body, the lug comprises a bending part and a connecting part, the bending part is bent relative to the connecting part and is connected between the battery cell main body and the connecting part, and the connecting part is connected to a cover plate assembly; the insulating piece is positioned on one side, far away from the cover plate assembly, of the lug, and comprises a first part, a second part and a third part, the third part is connected between the first part and the second part, the first part is connected with the connecting part, and the second part is connected with the battery cell main body, so that the third part corresponds to the bending part; at least part of the third part is not connected with the bending part, and the first part, the second part and the third part are integrally arranged, so that the installation efficiency of the insulating part can be improved, the risk of tension fracture of the tab in the bending process is reduced, and the performance of the battery is improved.

Description

Battery and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery and a battery pack.

Background

In the related art, a tab of a battery is adhered with a glue layer structure, so that the tab is insulated from an external structure. In the tab bending process, the tab is easily torn by the glue layer structure, so that the normal use of the tab is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery and a battery pack, which are used for improving the performance of the battery.

According to a first aspect of the present invention, there is provided a battery comprising:

a cover plate assembly;

the battery comprises a battery cell, wherein the battery cell comprises a battery cell main body and a lug, the lug extends out of the battery cell main body, the lug comprises a bending part and a connecting part, the bending part is bent relative to the connecting part and is connected between the battery cell main body and the connecting part, and the connecting part is connected to a cover plate assembly;

the insulating piece is positioned on one side, far away from the cover plate assembly, of the lug, and comprises a first part, a second part and a third part, the third part is connected between the first part and the second part, the first part is connected with the connecting part, and the second part is connected with the cell main body, so that the third part corresponds to the bending part;

wherein, the third part is not connected with the bending part at least partially, and the first part, the second part and the third part are arranged integrally.

The battery comprises the cover plate assembly, the battery cell and the insulating piece, wherein the pole lug of the battery cell is electrically connected with the cover plate assembly, and the insulating piece is positioned on one side of the pole lug, which is far away from the cover plate assembly, so that the pole lug can be prevented from being electrically connected with other components. The first part of the insulating piece is connected with the connecting part, the second part of the insulating piece is connected with the battery cell main body, and at least part of the third part of the insulating piece is not connected with the bending part, so that the risk of tension cracking in the tab bending process can be reduced, and the performance of the battery is improved. And because first part, second part and third part set up as an organic whole to can improve the installation effectiveness of insulating part, and then improve the packaging efficiency of battery.

According to a second aspect of the present invention, there is provided a battery pack comprising the above battery.

The battery pack comprises a battery, wherein the battery comprises a cover plate assembly, a battery cell and an insulating piece, a lug of the battery cell is electrically connected with the cover plate assembly, and the insulating piece is positioned on one side of the lug, which is far away from the cover plate assembly, so that the lug can be prevented from being electrically connected with other components. The first part of the insulating piece is connected with the connecting part, the second part of the insulating piece is connected with the battery cell main body, and at least part of the third part of the insulating piece is not connected with the bending part, so that the risk of tension cracking in the tab bending process can be reduced, and the performance of the battery is improved. And because first part, second part and third part set up as an organic whole to can improve the installation effectiveness of insulating part, and then improve the packaging efficiency of battery.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic cross-sectional view of a battery according to an exemplary embodiment;

fig. 2 is a schematic diagram illustrating a structure of an insulating member of a battery according to an exemplary embodiment.

The reference numerals are explained below:

10. a cover plate assembly; 11. a cover plate; 12. a pole column; 13. connecting sheets; 20. an electric core; 21. a cell main body; 22. a tab; 221. a bending section; 222. a connecting portion; 30. an insulating member; 31. a first portion; 311. a first glue layer; 32. a second portion; 321. a second adhesive layer; 33. a third portion; 34. a substrate layer.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery, please refer to fig. 1 and fig. 2, the battery includes: a cover plate assembly 10; the battery cell 20, the battery cell 20 includes a battery cell main body 21 and a tab 22, the tab 22 extends from the battery cell main body 21, the tab 22 includes a bending portion 221 and a connecting portion 222, the bending portion 221 is bent relative to the connecting portion 222 and connected between the battery cell main body 21 and the connecting portion 222, and the connecting portion 222 is connected to the cover plate assembly 10; the insulating member 30 is located on one side of the tab 22 away from the cover plate assembly 10, the insulating member 30 includes a first portion 31, a second portion 32 and a third portion 33, the third portion 33 is connected between the first portion 31 and the second portion 32, the first portion 31 is connected with the connecting portion 222, and the second portion 32 is connected with the cell main body 21, so that the third portion 33 corresponds to the bending portion 221; at least a part of the third portion 33 is not connected to the bent portion 221, and the first portion 31, the second portion 32, and the third portion 33 are integrally provided.

The battery of one embodiment of the present invention includes a cover plate assembly 10, a battery cell 20, and an insulating member 30, wherein a tab 22 of the battery cell 20 is electrically connected to the cover plate assembly 10, and the insulating member 30 is located on a side of the tab 22 away from the cover plate assembly 10, so that electrical connection between the tab 22 and other components can be avoided. By connecting the first portion 31 of the insulating member 30 with the connecting portion 222, connecting the second portion 32 with the cell main body 21, and disconnecting at least part of the third portion 33 from the bent portion 221, the risk of the tab 22 being pulled apart during bending can be reduced, thereby improving the performance of the battery. And since the first portion 31, the second portion 32 and the third portion 33 are integrally provided, the mounting efficiency of the insulator 30 can be improved, thereby improving the assembling efficiency of the battery.

It should be noted that the tab 22 may include at least two metal sheets, where the metal sheets are metal sheets, and the metal sheets may be a part of the current collector, or there are other options, and are not limited herein. A plurality of metal sheets stacked to form the tab 22 may be connected together by welding and bent, thereby forming the bent portion 221 and the connection portion 222.

The first portion 31, the second portion 32 and the third portion 33 of the insulating member 30 can ensure that the tab 22 and the cell main body 21 are isolated from each other, so as to avoid electrical connection between the tab 22 and other components, for example, the tab 22 directly forms electrical connection with a current collector unit of the cell main body 21 after piercing a separator of the cell main body 21.

Since the first portion 31, the second portion 32, and the third portion 33 are integrally provided, the insulator 30 can be directly assembled to the tab 22 and the cell main body 21, thereby improving the assembly efficiency. The insulating member 30 may include an insulating coating and a metal member, and the metal member may be coated with the insulating coating, and the insulating coating may be aluminum oxide (Al)₂O₃) Zirconium oxide (ZrO)₂) The first portion 31 may be welded to the connecting portion 222 of the tab 22, the second portion 32 is in contact with the cell main body 21, the third portion 33 corresponds to the bent portion 221, the third portion 33 may be in contact with the bent portion 221, but the third portion 33 is not fixedly connected to the bent portion 221, so that the insulating member 30 may support the tab 22 while achieving insulation. The insulating member 30 may be made of an insulating material, such as rubber, resin, hemp, etc.

The battery includes a cell 20 and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell 20 refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode can be interchanged. The battery core 20 is disposed in a battery case, and the cover plate assembly 10 is connected to the battery case.

In one embodiment, the first portion 31 is bonded to the connecting portion 222, the second portion 32 is bonded to the cell main body 21, and at least a portion of the third portion 33 is not bonded to the bent portion 221, so that the tab 22 is prevented from being torn by the third portion 33 when the tab 22 is bent, on the basis of facilitating the insulating member 30 to be bonded to the connecting portion 222 and the cell main body 21.

The first portion 31 is bonded to the connection portion 222 at a region where the solder mark is located, the connection portion 222 forms the solder mark with the cover plate assembly 10, the second portion 32 is bonded to the separator of the cell main body 21, and the third portion 33 is located at the bent portion 221 and may extend to the upper portion of the cell main body 21. The connecting portion 222 may be welded, e.g., ultrasonically welded, to the connecting tab 13 of the cover plate assembly 10, with the ultrasonic weld located on the connecting tab 13.

Referring to fig. 1, the cover plate assembly 10 includes a cover plate 11, a pole 12 and a connecting plate 13, the pole 12 is disposed on the cover plate 11, the connecting plate 13 is disposed below the cover plate 11 and connected to the pole 12, and the connecting plate 13 is connected to the connecting portion 222. In some embodiments, it is not excluded that the connection portion 222 is directly connected with the pole post 12. In the present embodiment, the cell main body 21 may include two sub-cells, that is, the tabs 22 of the two sub-cells share one connecting sheet 13, and the tab 22 of each sub-cell is provided with an insulating member 30.

In one embodiment, as shown in fig. 2, the first portion 31 includes a first glue layer 311, the second portion 32 includes a second glue layer 321, and at least a portion of the third portion 33 does not include a glue layer, so that the insulating member 30 can be directly bonded to the connection portion 222 and the cell main body 21, thereby improving the assembly efficiency of the insulating member 30.

In certain embodiments, it is not excluded that a glue layer is applied to the connection portion 222 and the cell main body 21, and then the insulating member 30 is bonded to the connection portion 222 and the cell main body 21.

In one embodiment, as shown in fig. 2, the insulating member 30 includes: a base layer 34, on which a first glue layer 311 and a second glue layer 321 are arranged to form a first portion 31 and a second portion 32, respectively; the third portion 33 is formed by the base layer 34 between the first glue layer 311 and the second glue layer 321, so that the third portion 33 is free of glue layer, thereby ensuring that the third portion 33 can be disconnected from the bending portion 221.

The width W1 of the first glue layer 311 and the width W2 of the second glue layer 321 may be the same, or the width W1 of the first glue layer 311 and the width W2 of the second glue layer 321 may not be the same. The width W1 of the first glue layer 311 and the width W2 of the second glue layer 321 are both smaller than the width W3 of the third portion 33. The sum of the width W1 of the first glue layers 311 and the width W2 of the second glue layers 321 may be less than the width W3 of the third portions 33, or the sum of the width W1 of the first glue layers 311 and the width W2 of the second glue layers 321 may be equal to the width W3 of the third portions 33, or the sum of the width W1 of the first glue layers 311 and the width W2 of the second glue layers 321 may be greater than the width W3 of the third portions 33. In this embodiment, as shown in fig. 1, the width W1 of the first glue layer 311 and the width W2 of the second glue layer 321 may be the same, and the sum of the width W1 of the first glue layer 311 and the width W2 of the second glue layer 321 may be smaller than the width W3 of the third portion 33.

In one embodiment, as shown in fig. 2, an outer edge of the first glue layer 311 and an outer edge of the second glue layer 321 are respectively overlapped with two opposite outer edges of the base layer 34, that is, along the width direction of the base layer 34, the first glue layer 311 and the second glue layer 321 are respectively attached to the outer edges of the base layer 34, that is, the first portion 31 and the second portion 32 are ensured to have a large bonding area, so that the first portion 31 is reliably bonded to the connection portion 222, and the second portion 32 is reliably bonded to the cell main body 21. The width direction of the base layer 34 is the arrangement direction of the first portion 31, the third portion 33, and the second portion 32.

In one embodiment, the substrate layer 34 is made of an insulating material, and the substrate layer 34 includes a plastic material, which not only ensures effective insulation but also has a relatively low mass. The material of the substrate layer 34 may be Polypropylene (PP), Polyethylene (PE), or the like.

In one embodiment, the first glue layer 311 may include silicone, rubber, acrylic glue, or the like; the second adhesive layer 321 may include silicone, rubber, or acrylic adhesive, so as to ensure that the first portion 31 is reliably adhered to the connection portion 222, and the second portion 32 is reliably adhered to the cell main body 21. The first adhesive layer 311 may be at least one of silicone rubber, or acryl rubber, and the second adhesive layer 321 may be at least one of silicone rubber, or acryl rubber.

In one embodiment, the thickness of the insulating member 30 is 0.03mm to 5mm, which not only ensures effective insulating ability, but also prevents the insulating member 30 from occupying too much space due to its excessive thickness. The thickness of the insulator 30 may be 0.03mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5 mm.

In one embodiment, the insulator 30 is an adhesive tape, thereby facilitating assembly of the insulator 30. The insulating member 30 provided on the tab 22 and the cell main body 21 may be a part of a tape structure, i.e., a part is cut out on one tape structure for being provided on one tab 22 and the cell main body 21.

In one embodiment, the side of the tab 22 adjacent to the cover plate assembly 10 may be provided with other insulating structures, which may be similar to the above-mentioned insulator 30, or may be a conventional adhesive tape structure, and is not limited herein.

An embodiment of the utility model also provides a battery pack comprising the battery.

The battery pack according to one embodiment of the present invention includes a battery including a cover plate assembly 10, a battery cell 20, and an insulator 30, wherein a tab 22 of the battery cell 20 is electrically connected to the cover plate assembly 10, and the insulator 30 is located on a side of the tab 22 away from the cover plate assembly 10, so that electrical connection between the tab 22 and other components can be avoided. By connecting the first portion 31 of the insulating member 30 with the connecting portion 222, connecting the second portion 32 with the cell main body 21, and disconnecting at least part of the third portion 33 from the bent portion 221, the risk of the tab 22 being pulled apart during bending can be reduced, thereby improving the performance of the battery. And since the first portion 31, the second portion 32 and the third portion 33 are integrally provided, the mounting efficiency of the insulator 30 can be improved, thereby improving the assembling efficiency of the battery.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate for fixing the plurality of batteries.

The battery pack includes a plurality of batteries and a case for fixing the plurality of batteries.

It should be noted that, the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the box body. Wherein, a plurality of batteries can form and install in the box behind the battery module, and at this moment, the battery module can be including the end plate and the curb plate of fixed a plurality of batteries. Or, a plurality of batteries can directly set up in the box, need not to carry out in groups a plurality of batteries promptly, utilize the box to fix a plurality of batteries, at this moment, can get rid of end plate and curb plate.

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

It will be understood that the present disclosure 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 present disclosure is limited only by the appended claims.

Claims

1. A battery, comprising:

a cover plate assembly (10);

the battery cell (20), the battery cell (20) includes a battery cell main body (21) and a tab (22), the tab (22) extends from the battery cell main body (21), the tab (22) includes a bending portion (221) and a connecting portion (222), the bending portion (221) is bent relative to the connecting portion (222) and connected between the battery cell main body (21) and the connecting portion (222), and the connecting portion (222) is connected to the cover plate assembly (10);

an insulating member (30), wherein the insulating member (30) is located on a side of the tab (22) away from the cover plate assembly (10), the insulating member (30) comprises a first portion (31), a second portion (32) and a third portion (33), the third portion (33) is connected between the first portion (31) and the second portion (32), the first portion (31) is connected with the connecting portion (222), and the second portion (32) is connected with the cell main body (21), so that the third portion (33) corresponds to the bending portion (221);

wherein at least a part of the third portion (33) is not connected to the bent portion (221), and the first portion (31), the second portion (32), and the third portion (33) are integrally provided.

2. The battery according to claim 1, wherein the first portion (31) is bonded to the connecting portion (222), and the second portion (32) is bonded to the cell body (21).

3. The battery according to claim 2, characterized in that the first portion (31) comprises a first glue layer (311) and the second portion (32) comprises a second glue layer (321).

4. The battery according to claim 3, wherein the insulating member (30) comprises:

a base layer (34), said base layer (34) being provided with said first glue layer (311) and said second glue layer (321) to form said first portion (31) and said second portion (32), respectively;

wherein the base layer (34) located between the first glue layer (311) and the second glue layer (321) forms the third portion (33).

5. The battery according to claim 4, wherein an outer edge of the first glue layer (311) and an outer edge of the second glue layer (321) coincide with two opposite outer edges of the base layer (34), respectively.

6. The battery of claim 4, wherein the substrate layer (34) comprises plastic.

7. The battery according to claim 3, wherein the first glue layer (311) comprises silicone, rubber or acrylic glue;

the second glue layer (321) comprises silica gel, rubber or acrylic glue.

8. The battery according to any one of claims 1 to 7, wherein the thickness of the insulator (30) is 0.03-5 mm.

9. The battery according to any one of claims 1 to 7, wherein the insulating member (30) is an adhesive tape.

10. A battery pack characterized by comprising the battery of any one of claims 1 to 9.