CN221009177U

CN221009177U - Battery cell

Info

Publication number: CN221009177U
Application number: CN202322639082.1U
Authority: CN
Inventors: 朱威; 唐伟; 陈祺康
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2024-05-24
Anticipated expiration: 2033-09-27

Abstract

The utility model discloses a battery, which comprises a battery cell, a shell and a connecting piece, wherein the battery cell comprises a battery cell body and a soft tab extending out of the battery cell body; a cavity is formed in the shell and is used for accommodating the battery cell; the connecting piece comprises a first part and a second part which is bent towards a first direction (z) relative to the first part, the second part extends towards a second direction (x) and protrudes out of a first side edge of the first part to form a connecting area, and the connecting area is not overlapped with the projection of the first part in the first direction (z); the connecting area is connected with the soft tab, and the first part extends out of the shell. Therefore, the battery is connected with the soft tab through the connecting area of the connecting piece, so that the first part of the connecting piece is dislocated with the soft tab in the second direction (x), the lower limit of the thickness of the battery core is not limited by the length of the bending connecting section of the hard tab, and the problem that the thickness dimension caused by the tab bending process is limited due to the application can be solved. Meanwhile, the battery cell structure has the advantages of good consistency of protruding of the lugs, stable spacing and high straightness of the lugs.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries.

Background

The polymer battery has the advantages of high energy density, long cycle service life, strong temperature adaptability and the like, wherein the lithium ion battery with the multi-lug structure is suitable for application working conditions of high multiplying power and quick charge, and along with iterative design of the lithium ion battery structure and quick development of the technical level in the industry, thinner cell structure design is required by a client in the industry. The multi-pole ear structure needs to be connected with the hard pole ear on the multi-layer soft pole ear, the common process is to bend the hard pole ear and the soft pole ear for one time respectively, but the hard pole ear of the process coincides with the soft pole ear in the width direction, so that the lower limit of the thickness in the structural design of the multi-pole ear battery core is limited by the length of the bending connecting section of the hard pole ear, when the multi-pole ear battery core is compatible with a thinner battery core, the length of the bending section of the hard pole ear is larger than the thickness of the battery core, the great energy density can be lost, and the existing process can only be compatible with the thickness of more than 3.5mm under the condition of not losing the great energy density. If the process of not folding the tab is adopted, the width of the top edge seal can be greatly increased, and the manufacturing process is extremely difficult.

Disclosure of utility model

In view of the above, an object of the present utility model is to provide a battery.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

A battery, comprising:

The battery cell comprises a battery cell body and soft electrode lugs extending out of the battery cell body;

the shell is internally provided with a cavity for accommodating the battery cell;

A second portion, a connecting member, the connecting member comprising a first portion and the second portion bent in a first direction (z) relative to the first portion, extending in a second direction (x) and protruding from a first side of the first portion to form a connecting region, the connecting region not overlapping with a projection of the first portion in the first direction (z);

The connecting area is connected with the soft tab, and the first part extends out of the shell.

Optionally, in the above battery, an angle of the second portion near one end of the first portion is a chamfer, and a radius of a center of the chamfer is not less than 0.5 and not more than 1.5;

And/or the angle of the second part near one end of the first part is a bending angle, and the bending edge of the bending angle is formed in an inclined way towards one side near the connecting area.

Optionally, in the above battery, the battery further includes a first insulating member disposed at an end of the first portion near the second portion;

The first insulating member covers the upper and lower surfaces of the first portion, and protrudes from both sides of the first portion in the second direction (x).

Optionally, in the above battery, a ratio of a dimension of the first insulating member in the second direction (x) to a dimension of the first portion in the second direction (x) is not less than 2.

Optionally, in the above battery, the first insulating member includes tab adhesive.

Optionally, in the above battery, the soft tab includes a first soft tab and a second soft tab; the connecting piece comprises a first connecting piece and a second connecting piece;

The first soft tab is connected with the connection region of the first connecting piece, and the second soft tab is connected with the connection region of the second connecting piece.

Optionally, in the above battery, a plurality of the first soft tabs are arranged in a stacked manner, and each is connected with the first connection member; the second soft tabs are arranged in a stacked mode and are connected with the second connecting piece.

Optionally, in the above battery, the soft tab and the connection region are welded to form a welding region, and a ratio of a height of the welding region to a dimension of the second portion in the first direction (z) is not less than 0.4 and not more than 0.8;

The ratio of the land height to the dimension of the second portion along the second direction (x) is not greater than 0.5.

Optionally, in the above battery, a second insulating member is further included for fixing the second portion to a side end of the cell body.

Optionally, in the above battery, the second insulating member includes a protective paste.

Optionally, in the above battery, a ratio of a pitch of the first connecting member and the second connecting member to a dimension of the second portion in the second direction (x) is not more than 5 and not less than 1.

According to the battery provided by the utility model, the battery core is connected through the connecting area of the connecting piece, the connecting area protrudes out of the first side edge of the first part, and the projections of the connecting area and the first part in the first direction (z) are not overlapped, so that the first part of the connecting piece is dislocated with the soft tab in the second direction (x), the lower limit of the thickness of the battery core is not limited by the length of the bending connecting section of the hard tab, and the problem of the applicable limitation of the thickness dimension caused by the tab bending process can be solved. Meanwhile, the battery cell structure has the advantages of good consistency of protruding lugs, stable spacing and high lug straightness, and the winding cores of the same design can meet the design requirements of different lug pitches by adjusting the length of the second part.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a tab according to an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a connection between a tab and a soft tab according to an embodiment of the present utility model;

fig. 3 is a top view of a tab and a connection such as a soft tab according to an embodiment of the present utility model.

Wherein:

1-cell, 2-connector, 21-first part, 22-second part, 221-connection region, 3-chamfer,

4-First insulating part, 51-first soft tab, 52-second soft tab, 6-second insulating part.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 3, an embodiment of the present utility model provides a battery.

Firstly, the battery comprises a battery cell 1, a shell and a connecting piece 2, wherein the battery cell 1 comprises a battery cell body and soft lugs extending out of the battery cell body; a cavity is formed in the shell, and the cavity is used for accommodating the battery cell 1; the connecting piece 2 comprises a first part 21 and a second part 22 bent towards a first direction (z) relative to the first part 21, wherein the second part 22 extends towards a second direction (x) and protrudes out of a first side edge of the first part 21 to form a connecting area 221, and the connecting area 221 is not overlapped with the projection of the first part 21 in the first direction (z); the connection region 221 is connected to the soft tab, and the first portion extends out of the housing. When the connecting member 2 is connected to the soft tab, the first direction is the thickness direction of the battery cell 1, and the second direction is the width direction of the battery cell 1. The connecting area and the extending area of the electrode lug are not in the same position, meanwhile, the thickness direction does not occupy a large space, the thickness space occupies a welding and printing width area, and the thickness space is only 1.0-1.8mm, so that the electrode lug structure of the ultrathin battery cell 1 can be compatible, and meanwhile, the energy density is not lost. Meanwhile, the first side may be any one of two sides of the first portion perpendicular to the width direction of the cell, that is, the direction of the connection region 221 is not limited to the inward direction in the present embodiment, but may be a reverse direction. In the specific implementation, the soft tab is bent for one time, and the thickness of the soft tab after bending does not exceed the thickness of the battery cell, so that the thickness of the connecting piece 2 does not exceed the thickness of the battery cell; the connecting piece 2 is bent once, and the first part 21 and the soft tab are dislocated when seen from the second direction (x), so that burrs at the tail end edge of the second part 22 cannot damage the bending part of the soft tab.

It can be seen that, in the battery provided in the embodiment of the present utility model, the soft tab is connected through the connection region 221 of the connection member 2, the connection region 221 protrudes from the first side edge of the first portion 21, and the projections of the connection region 221 and the first portion 21 in the first direction (z) are not overlapped, so that the first portion 21 of the connection member is dislocated with the soft tab in the second direction (x), and therefore, the lower limit of the thickness of the battery core 1 is not limited by the length of the bending connection section of the hard tab, and the problem of limitation of the thickness dimension application caused by the tab bending process can be solved. Meanwhile, the battery core 1 structure has the advantages of good consistency of protruding lugs, stable spacing and high lug straightness, and the winding cores with the same design can meet the design requirements of different lug spacing by adjusting the length of the connecting area 221.

In specific implementation, the angle of the second part 22 near one end of the first part 21 is a chamfer 3, and the radius of the center of the chamfer 3 is not less than 0.5 and not more than 1.5; and/or, the angle of the second portion 22 near the end of the first portion 21 is a bending angle, and the bending edge of the bending angle is formed obliquely to the side near the connecting area 221, that is, the angle corresponding to the end of the second portion 22 near the first portion 21 is cut off to form two bending angles with obtuse angles connecting one bevel edge. The chamfer 3 and the bending angle are used for preventing sharp angles from being formed at the part, so that the situation of puncturing a diaphragm or an aluminum plastic film and avoiding appearance defects is avoided. It should be noted that the connecting piece 2 may be formed by folding a conventional hard tab, or may be formed by directly punching and cutting, but is not limited thereto, and those skilled in the art may design according to actual needs. In specific implementation, the root part, close to the insulating layer, of the traditional hard lug connection soft lug area is folded to be perpendicular to the length direction of the hard lug to form a 45-degree bevel edge, so that the situation that a diaphragm or an aluminum plastic film is pierced and appearance defects are avoided.

In specific implementation, the device further comprises a first insulating piece 4, wherein the first insulating piece 4 is arranged at one end of the first part 21, which is close to the second part 22; the first insulating member 4 covers the upper and lower surfaces of the first portion 21, and the first insulating member 4 protrudes from both sides of the first portion 21 in the second direction x. And the later-stage battery cell 1 is convenient to seal during packaging.

In particular, the ratio of the dimension of the first insulating member 4 in the second direction x to the dimension of the first portion 21 in the second direction x is not less than 2, so that the welding and fixing of the connection region 221 and the soft tab are prevented from being affected by too long length of the first insulating member 4.

In particular, the first insulating member 4 includes a tab adhesive. The convenient installation operation can play insulating effect, and simultaneously the gelatiniform material is convenient for coating operation, and the leakproofness is better, and the insulating effect is better.

In specific implementation, the soft tabs include a first soft tab 51 and a second soft tab 52; the connecting piece 2 comprises a first connecting piece and a second connecting piece; the first soft tab 51 is connected to the connection region 221 of the first connection member, and the second soft tab 52 is connected to the connection region 221 of the second connection member. The first connecting piece and the second connecting piece are similar in structure and symmetrical, and can be asymmetrically arranged. The protruding position of the tab of the battery cell 1 can be flexibly adjusted by the length and the direction of the second part 22.

In specific implementation, a plurality of first soft tabs 51 are arranged in a stacked manner and are connected with the first connecting piece; a plurality of second soft tabs 52 are arranged in a stacked manner and are each connected to a second connection member.

In particular, the soft tab is welded to the connection region 221 to form a welding region, and the ratio of the height of the welding region to the dimension of the second portion 22 along the first direction (z) is not less than 0.4 and not more than 0.8; the ratio of the land height to the dimension of the second portion 22 in the second direction (x) is not greater than 0.5.

In particular, the second insulating member 6 is further included for fixing the second portion 22 to the side end of the body of the cell 1. Extending from above the pole piece to completely cover the weld zone, while the width direction is required to completely cover the second portion 22 of the connector 2.

In particular, the second insulating member 6 comprises a protective glue. The convenient installation operation can play insulating effect, and simultaneously the gelatiniform material is convenient for coating operation, and the leakproofness is better, and the insulating effect is better.

In particular, the ratio of the spacing between the first and second connectors to the dimension of the second portion 22 in the second direction (x) is not greater than 5 and not less than 1.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, comprising:

The battery cell (1), the said battery cell (1) includes the body of the battery cell and stretches out the soft tab outside the body of the said battery cell;

a housing, wherein a cavity is formed in the housing and is used for accommodating the battery cell (1);

A connecting member (2), the connecting member (2) comprising a first portion (21) and a second portion (22) bent in a first direction (z) relative to the first portion (21), the second portion (22) extending in a second direction (x) and protruding from a first side of the first portion (21) to form a connection region (221), the connection region (221) not overlapping with a projection of the first portion (21) in the first direction (z);

the connecting region (221) is connected with the soft tab, and the first part extends out of the shell.

2. The battery according to claim 1, wherein the angle of the second portion (22) near the end of the first portion (21) is a chamfer (3), and the radius of the center of the chamfer (3) is not less than 0.5 and not more than 1.5;

And/or the angle of the second part (22) near one end of the first part (21) is a bending angle, and the bending edge of the bending angle is formed in an inclined way towards one side near the connecting area (221).

3. The battery according to claim 1, further comprising a first insulating member (4), the first insulating member (4) being provided at an end of the first portion (21) adjacent to the second portion (22);

the first insulating member (4) covers the upper and lower surfaces of the first portion (21), and the first insulating member (4) protrudes from both sides of the first portion (21) in the second direction (x).

4. A battery according to claim 3, characterized in that the ratio of the dimension of the first insulating member (4) in the second direction (x) to the dimension of the first portion (21) in the second direction (x) is not less than 2.

5. A battery according to claim 3, characterized in that the first insulating member (4) comprises a tab glue.

6. The battery according to claim 1, wherein the soft tabs comprise a first soft tab (51) and a second soft tab (52); the connecting piece (2) comprises a first connecting piece and a second connecting piece;

The first soft tab (51) is connected with the connection region (221) of the first connection member, and the second soft tab (52)) is connected with the connection region (221) of the second connection member.

7. The battery according to claim 6, wherein the first soft tab (51) is arranged in a plurality in a stacked manner and is connected to the first connection member; the second soft tabs (52) are arranged in a stacked manner, and are connected with the second connecting piece.

8. The battery according to claim 1, characterized in that the soft tab is welded with the connection region (221) to form a welded region, the ratio of the height of the welded region to the dimension of the second portion (22) along the first direction (z) being not less than 0.4 and not more than 0.8;

The ratio of the land height to the dimension of the second portion (22) in the second direction (x) is not greater than 0.5.

9. The battery according to claim 1, further comprising a second insulating member (6) for fixing the second portion (22) to a side end of the cell body.

10. The battery according to claim 9, characterized in that the second insulating member (6) comprises a protective glue.

11. The battery according to claim 6, characterized in that the ratio of the spacing of the first and second connection members to the dimension of the second portion (22) in the second direction (x) is not greater than 5 and not less than 1.