CN219959330U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, which comprises a battery shell, an electrode assembly, a first adapter and a second adapter; the battery case includes a cover plate; the electrode assembly is arranged in the battery shell and comprises a main body part, at least two first lugs and at least two second lugs, and the first lugs and the second lugs are connected to the main body part; the first adapter comprises at least two first connecting parts, a first notch is arranged between two adjacent first connecting parts, and the first tab is welded on the first connecting parts; the second adapter comprises at least two second connecting parts, a second notch is arranged between every two adjacent second connecting parts, and a second lug is welded on each second connecting part; the melting point of the first adapter is greater than that of the second adapter, and the orthographic projection area of the first notch on the cover plate is smaller than that of the second notch on the cover plate. The heat dissipation effect is good when the first transfer piece of the battery is welded with the first tab; ensure the stability of the connection of the lug and the adapter.

Description

Battery cell

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery.

Background

Lithium ion batteries with the advantages of high energy density, long cycle life, green and pollution-free properties have become one of the necessary choices for the future automotive industry.

At present, when the first adapter of the battery is welded with the first tab, the heat dissipation effect is poor.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure aims to overcome the defect of poor heat dissipation effect during welding in the related art, and provide a battery with good heat dissipation effect during welding.

According to one aspect of the present disclosure, there is provided a battery including:

a battery case including a cap plate;

the electrode assembly is arranged in the battery shell and comprises a main body part, at least two first lugs and at least two second lugs, and the at least two first lugs and the at least two second lugs are connected to the main body part;

the first connecting piece comprises at least two first connecting parts, a first notch is arranged between every two adjacent first connecting parts, at least two first lugs are welded on at least two first connecting parts, and at least part of the first connecting piece is arranged between the main body part and the cover plate;

the second adapter comprises at least two second connecting parts, a second notch is arranged between every two adjacent second connecting parts, at least two second lugs are welded on at least two second connecting parts, and at least part of the second adapter is arranged between the main body part and the cover plate;

the melting point of the first adapter is larger than that of the second adapter, and the orthographic projection area of the first notch on the cover plate is smaller than that of the second notch on the cover plate.

According to the battery disclosed by the disclosure, on one hand, the area of the orthographic projection of the first notch on the cover plate is smaller than that of the orthographic projection of the second notch on the cover plate, the area of the first adapter piece is increased as much as possible, namely the heat dissipation area of the first adapter piece is increased as much as possible, so that when the first adapter piece is welded with the first tab, generated heat is transferred as much as possible, the heat is prevented from being concentrated at the welding position, other parts of the battery are prevented from being influenced, for example, deformation of lower plastic is prevented from being caused, and the insulativity between the cover plate and the electrode assembly is ensured; on the other hand, under the condition that the rated capacity of the battery is unchanged, at least two first lugs and at least two second lugs are arranged, so that the thicknesses of the first lugs and the second lugs are thinner, less energy is required during welding, less heat is generated, and heat transfer is facilitated; on the other hand, two first tabs can be isolated through the first notch, and when one first tab is subjected to vibration, part of the vibration can be absorbed through the first notch, so that the transmission of the vibration to the other first tab is reduced or even avoided; or under the condition that the positions of the two first tabs are deviated, the two parts connected with the two first tabs are positioned at the two sides of the first notch, so that certain deformation can be generated respectively, and the connection stability of the two first tabs and the first adapter is ensured; similarly, two second lugs can be isolated through the second notch, and when one second lug is subjected to vibration, part of the vibration can be absorbed through the second notch, so that the transmission of the vibration to the other second lug is reduced or even avoided; or under the condition that the positions of the two second lugs are deviated, two parts connected with the two second lugs are positioned at two sides of the second notch, so that two fixed deformations can be respectively generated, and the connection stability of the two second lugs and the second adapter is ensured.

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

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic structural view of an example embodiment of a battery of the present disclosure.

Fig. 2 is a schematic view of the structure of the tab portion and post assembly of fig. 1 after welding.

Fig. 3 is a schematic structural view of the first adaptor in fig. 2.

Fig. 4 is a schematic structural view of the second adaptor in fig. 2.

Reference numerals illustrate:

1. a battery case; 11. a cover plate; 12. a side plate; 13. a bottom plate;

2. an electrode assembly; 2a, a first electrode assembly; 2b, a second electrode assembly; 21. a first tab; 22. a second lug; 23. a main body portion; 23a, a first body portion; 23b, a second body portion;

3. a first adapter; 31. a first notch; 32. a first body portion; 33. a first connection portion;

4. a second adapter; 41. a second notch; 42. a second body portion; 43. a second connecting portion;

51. a first battery post; 52. a second battery post;

61. a first welded portion; 62. a second welded portion;

7. an insulating member; 8. lower plastic;

x, length direction; y, width direction.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

In the present utility model, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The present disclosure provides a battery, which may include a battery case 1, an electrode assembly 2, a first adapter 3, and a second adapter 4, as shown with reference to fig. 1 to 4; the battery case 1 may include a cover plate 11; the electrode assembly 2 is disposed in the battery case 1, and the electrode assembly 2 may include a body portion 23, at least two first tabs 21 and at least two second tabs 22, the at least two first tabs 21 and the at least two second tabs 22 being connected to the body portion 23; the first adaptor 3 may include at least two first connection portions 33, a first notch 31 is disposed between two adjacent first connection portions 33, at least two first tabs 21 are welded to at least two first adaptors 3, and at least part of the first adaptor 3 is disposed between the main body portion 23 and the cover plate 11; the second adaptor 4 may include at least two second connection portions 43, a second notch 41 is disposed between two adjacent second connection portions 43, at least two second lugs 22 are welded to at least two second adaptors 4, and at least part of the second adaptor 4 is disposed between the main body portion 23 and the cover plate 11; the melting point of the first adapter 3 is greater than that of the second adapter 4, and the orthographic projection area of the first notch 31 on the cover plate 11 is smaller than that of the second notch 41 on the cover plate 11.

According to the battery disclosed by the disclosure, on one hand, by reducing the orthographic projection area of the first notch 31 on the cover plate 11, the area of the first adapter piece 3 is increased as much as possible, namely the heat dissipation area of the first adapter piece 3 is increased as much as possible, so that heat generated during welding the first adapter piece 3 and the first tab 21 is transferred as quickly as possible, the heat is prevented from being concentrated at a welding position, other parts of the battery are prevented from being influenced, for example, deformation of the lower plastic 8 is prevented from being caused, and the insulativity between the cover plate 11 and the electrode assembly 2 is ensured; on the other hand, under the condition that the rated capacity of the battery is unchanged, the at least two first lugs 21 and the at least two second lugs 22 are arranged, so that the thicknesses of the first lugs 21 and the second lugs 22 are thinner, less energy is required during welding, less heat is generated, and heat transfer is facilitated; on the other hand, the first notches 31 can isolate two first tabs 21, and in the case that one first tab 21 is subjected to vibration, a part of the vibration can be absorbed by the first notches 31, so that the transmission of the vibration to the other first tab 21 is reduced or even avoided; or, in the case that the positions of the two first tabs 21 deviate, two parts of the first adapter 3 connected with the two first tabs 21 are positioned at two sides of the first notch 31, so that certain deformation can be generated respectively, and the connection stability of the two first tabs 21 and the first adapter 3 is ensured; similarly, the second notches 41 can isolate the two second lugs 22, and in the case that one second lug 22 is subjected to vibration, a part of the vibration can be absorbed by the second notches 41, so that the transmission of the vibration to the other second lug 22 is reduced or even avoided; or, in the case that the positions of the two second lugs 22 deviate, the two parts of the second adapter 4 connected with the two second lugs 22 are located at two sides of the second notch 41, so that certain deformation can be generated respectively, and the connection stability of the two second lugs 22 and the second adapter 4 is ensured.

It should be noted that, the length direction X is the direction in which the first adaptor 3 points to the second adaptor 4, and the width direction Y is the direction in which one first connection portion 33 points to the adjacent other first connection portion 33; the longitudinal direction X is the longitudinal direction X of the battery, the width direction Y is the width direction Y of the battery, and both the longitudinal direction X and the width direction Y are used below.

As shown in fig. 1, the battery may be provided in a rectangular parallelepiped structure, that is, the battery may be provided in a quadrangular prism battery, and thus, the battery case 1 may be provided in a rectangular parallelepiped structure. Specifically, the battery case 1 may include a cover plate 11, a bottom plate 13, and four side plates 12; the four side plates 12 are arranged in pairs; the four side plates 12 are connected end to end in order to form a rectangular parallelepiped cylinder. A cover plate 11 is connected to one side of the four side plates 12, and a bottom plate 13 is connected to the opposite side of the four side plates 12. The cover plate 11, the bottom plate 13, and the four side plates 12 surround to form an accommodating space.

Of course, in other example embodiments of the present disclosure, the bottom plate 13 and the protective cover may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side plates 12 may be provided in one or more and surround to form a circular shape, an oval shape, a trapezoid shape, etc., such that the battery case 1 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc.

The material of the battery case 1 may be aluminum, steel, or other metal, alloy, or the like, but of course, other materials may be used, and will not be described.

The bottom plate 13 of the battery case 1 is disposed closer to the ground than the cover plate 11, the electrode assembly 2 inside the battery case 1 is supported by the bottom plate 13, and so on; of course, it is also possible that the cover plate 11 is disposed closer to the ground with respect to the bottom plate 13, the electrode assembly 2 inside the battery case 1 is supported by the cover plate 11, and the like, so that the battery is inverted.

Referring to fig. 1, an electrode assembly 2 is provided within a battery case 1, and the electrode assembly 2 may include a main body portion 23, two first tabs 21, and two second tabs 22; the two first tabs 21 and the two second tabs 22 may be led out from the same end face of the main body portion 23, that is, the two first tabs 21 and the two second tabs 22 may be disposed on the same end face of the main body portion 23 close to the cover plate 11. The two first tabs 21 are disposed opposite to each other in the width direction Y, and the two second tabs 22 are also disposed opposite to each other in the width direction Y.

Of course, in other example embodiments of the present disclosure, the first tab 21 and the second tab 22 may be provided in three, four, or more. The first tab 21 and the second tab 22 may also be led out from one end surface of the main body 23 near the side plate 12.

In the present exemplary embodiment, the main body portion 23 may be of a laminated type, and the main body portion 23 is also provided in a rectangular parallelepiped structure in order to be fitted with the battery case 1 of a rectangular parallelepiped structure. The main body portion 23 may include a first pole piece, a separator, and a second pole piece that are sequentially stacked, and the first pole piece, the separator, and the second pole piece are all provided in multiple layers. The first and second pole pieces are coated with different active substances.

In other example embodiments of the present disclosure, the body portion 23 may be wound, and the stacked structure formed by the first electrode sheet, the separator, and the second electrode sheet is wound to form a wound cell.

The first tab 21 is connected to the first pole piece, and may be that a part of the first pole piece extends to protrude from the main body 23, and is bent to a side of the first end surface away from the main body 23 to form the first tab 21; in this case, the first tab 21 may cover a portion of the first end face.

The second lug 22 is connected to the second lug, and may be that a part of the second lug extends to protrude from the main body 23 and is bent to a side of the first end surface away from the main body 23 to form the second lug 22; in this case, the second tab 22 may cover a portion of the first end face.

The first tab 21 and the second tab 22 are conductive foil areas not provided with an active material coating, that is, the active material coating is not coated on the first tab 21 and the second tab 22, and the first tab 21 and the second tab 22 are current collecting layers for transmitting current.

A first adapter 3 and a second adapter 4 are also provided within the battery housing 1. The first adapter 3 may be provided in a flat plate structure, and the first adapter 3 is located between the main body portion 23 and the cover plate 11. The first adapter 3 may include a first body portion 32 and two first connection portions 33, both of the first connection portions 33 being connected to one side of the first body portion 32 in the length direction X; the two adjacent first connecting portions 33 are arranged at intervals, so that a first notch 31 is arranged between the two adjacent first connecting portions 33, the first notch 31 is located at one end of the first adapter 3 in the length direction X, and the first notch 31 extends along the length direction X.

The two first tabs 21 are welded to the two first connection portions 33 and are located at opposite sides of the first notch 31, specifically, the two first tabs 21 are located at opposite sides of the first notch 31 in the width direction Y in a one-to-one correspondence manner, the two first tabs 21 can be isolated by the first notch 31, and in the case that one of the first tabs 21 is subjected to vibration, a part of the vibration can be absorbed by the first notch 31, so that the vibration is reduced or even prevented from being transmitted to the other first tab 21; or, in the case that the positions of the two first tabs 21 deviate, the two parts of the first adaptor 3 connected with the two first tabs 21 are located at two sides of the first notch 31, so that certain deformation can be generated respectively, and the connection stability of the two first tabs 21 and the first adaptor 3 is ensured.

Moreover, by arranging the two first tabs 21, the thickness of each first tab 21 can be made thinner, and less energy is required during welding, so that less heat is generated, and the heat transfer is facilitated.

Of course, in other example embodiments of the present disclosure, the first connection part 33 may be provided in three, four, or more, and the first tab 21 and the first connection part 33 may be welded in one-to-one correspondence; two first tabs 21 may be welded to the first connection portion 33, three first tabs 21 may be welded to the first connection portion 33, or the like.

The second adapter 4 may be provided in a flat plate structure, and the second adapter 4 may be located between the main body portion 23 and the cover plate 11. The second adaptor 4 may include a second body portion 42 and at least two second connection portions 43, each of the two second connection portions 43 being connected to one side of the second body portion 42 in the length direction X; the two adjacent second connecting portions 43 are arranged at intervals, so that a second notch 41 is arranged between the two adjacent second connecting portions 43, the second notch 41 is located at one end of the second adapter 4 in the length direction X, and the second notch 41 extends along the length direction X.

The two second lugs 22 are welded to the two second connecting portions 43 and are located at two opposite sides of the second notch 41, specifically, the two second lugs 22 are located at two opposite sides of the second notch 41 in the width direction Y in a one-to-one correspondence manner, the two second lugs 22 can be isolated through the second notch 41, and when one of the second lugs 22 is subjected to vibration, a part of the vibration can be absorbed through the second notch 41, so that the vibration is reduced or even prevented from being transmitted to the other second lug 22; or, in the case that the positions of the two second lugs 22 deviate, the two parts of the second adapter 4 connected with the two second lugs 22 are located at two sides of the second notch 41, so that certain deformation can be generated respectively, and the connection stability of the two second lugs 22 and the second adapter 4 is ensured.

Moreover, by arranging two second lugs 22, the thickness of each second lug 22 can be thinner, and less energy is required during welding, so that less heat is generated, and the heat transfer is more facilitated.

Of course, in other example embodiments of the present disclosure, the second connection parts 43 may be provided in three, four, or more, and the second lugs 22 and the second connection parts 43 may be welded and connected in one-to-one correspondence; two second lugs 22 may be welded to the second connecting portion 43, three second lugs 22 may be welded to the second connecting portion 43, and so on.

In addition, the first adapter 3 may be provided in a bent structure, that is, the first adapter 3 may include two vertically connected flat plates, in which case one flat plate of the first adapter 3 is provided between the main body portion 23 and the cover plate 11, and the other flat plate of the first adapter 3 is provided between the main body portion 23 and the side plate 12 and is connected to the first tab 21 led out from an end face of the main body portion 23 near the side plate 12. Of course, the second adapter 4 may be provided in a bent configuration, i.e. the second adapter 4 may comprise two vertically connected plates, in which case one plate of the second adapter 4 is provided between the main body 23 and the cover plate 11, and the other plate of the second adapter 4 is provided between the main body 23 and the side plate 12 and is connected to a second lug 22 leading from an end face of the main body 23 adjacent to the side plate 12.

The melting point of the first adapter 3 is greater than that of the second adapter 4, specifically, the first tab 21 is a copper tab, that is, the material of the first tab 21 is copper; the second lug 22 is an aluminum lug, i.e. the second lug 22 is made of aluminum; the first adapter 3 is a copper adapter, i.e. the material of the first adapter 3 is copper; the second adaptor 4 is an aluminum adaptor, that is, the material of the second adaptor 4 is aluminum. Copper has a melting point greater than that of aluminum.

Of course, in other exemplary embodiments of the present disclosure, the material of the first adaptor 3 may be other materials, the material of the first adaptor 3 may be nickel, and the material of the first tab 21 may also be nickel.

Because the melting point of the first adaptor 3 is greater than that of the second adaptor 4, when the first adaptor 3 is welded with the first tab 21, the required energy is higher, the generated heat is more, the generated heat needs to be transferred faster, the generated heat is prevented from affecting other parts of the battery, and most importantly, the lower plastic 8 is affected (the lower plastic 8 is arranged between the cover plate 11 and the electrode assembly 2 and can insulate the cover plate 11 from the electrode assembly 2 through the lower plastic 8), if the heat is concentrated for a long time, the lower plastic 8 is deformed, so that the insulativity between the cover plate 11 and the electrode assembly 2 is affected.

In this exemplary embodiment, the area of the orthographic projection of the first notch 31 on the cover plate 11 is smaller than the area of the orthographic projection of the second notch 41 on the cover plate 11, so that the area of the first adapter 3 is increased as much as possible, that is, the heat dissipation area of the first adapter 3 is increased as much as possible, so that when the first adapter 3 is welded with the first tab 21, the generated heat is transferred as quickly as possible, the heat is prevented from being concentrated at the welding position, other parts of the battery are prevented from being influenced, for example, deformation of the lower plastic 8 is prevented, and the insulation between the cover plate 11 and the electrode assembly 2 is ensured.

Specifically, referring to fig. 2, 3, and 4, the first notch 31 and the second notch 41 may each be provided in a rectangular shape, and the width K1 of the first notch 31 is smaller than the width K2 of the second notch 41 in the width direction Y of the battery; in the longitudinal direction X of the battery, the length L1 of the first notch 31 is smaller than the length L3 of the second notch 41. The arrangement may be such that the area of the front projection of the first recess 31 on the cover plate 11 is smaller than the area of the front projection of the second recess 41 on the cover plate 11.

Of course, in other example embodiments of the present disclosure, the width K1 of the first notch 31 may be smaller than the width K2 of the second notch 41 in the width direction Y of the battery; further, in the longitudinal direction X of the battery, the length L1 of the first notch 31 is equal to the length L3 of the second notch 41. It is also possible that the width K1 of the first notch 31 is equal to the width K2 of the second notch 41 in the width direction Y of the battery; in the longitudinal direction X of the battery, the length L1 of the first notch 31 is smaller than the length L3 of the second notch 41.

Specifically, the width K1 of the first notch 31 is 5 mm or more and 10 mm or less, for example, the width K1 of the first notch 31 may be 5.2 mm, 5.5 mm, 5.7 mm, 6 mm, 6.3 mm, 6.5 mm, 6.8 mm, 7 mm, 7.2 mm, 7.5 mm, 7.7 mm, 8 mm, 8.3 mm, 8.5 mm, 8.8 mm, 9 mm, 9.2 mm, 9.5 mm, 9.7 mm, and the like.

The length L1 of the first notch 31 is 7 mm or more and 15 mm or less, for example, the length L1 of the first notch 31 may be 7.2 mm, 7.5 mm, 7.7 mm, 8 mm, 8.3 mm, 8.5 mm, 8.8 mm, 9 mm, 9.2 mm, 9.5 mm, 9.7 mm, 10 mm, 10.3 mm, 10.5 mm, 10.8 mm, 11 mm, 11.2 mm, 11.5 mm, 11.7 mm, 12 mm, 12.3 mm, 12.5 mm, 12.8 mm, 13 mm, 13.2 mm, 13.5 mm, 13.7 mm, 14 mm, 14.3 mm, 14.5 mm, 14.8 mm, and the like.

Specifically, the width K2 of the second notch 41 is 6 mm or more and 16 mm or less, for example, the width K2 of the second notch 41 may be 6.3 mm, 6.5 mm, 6.8 mm, 7 mm, 7.2 mm, 7.5 mm, 7.7 mm, 8 mm, 8.3 mm, 8.5 mm, 8.8 mm, 9 mm, 9.2 mm, 9.5 mm, 9.7 mm, 10 mm, 10.3 mm, 10.5 mm, 10.8 mm, 11 mm, 11.2 mm, 11.5 mm, 11.7 mm, 12 mm, 12.3 mm, 12.5 mm, 12.8 mm, 13 mm, 13.2 mm, 13.5 mm, 13.7 mm, 14 mm, 14.3 mm, 14.5 mm, 14.8 mm, 15 mm, 15.2 mm, 15.5 mm, 15.7 mm, and the like.

The length L3 of the second notch 41 is 5 mm or more and 19 mm or less, for example, the length L3 of the second notch 41 may be 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, 15.5 mm, 16 mm, 16.5 mm, 17 mm, 17.5 mm, 18 mm, 18.5 mm, and the like.

In some example embodiments of the present disclosure, the width of the first adapter 3 is greater than the width of the second adapter 4 in the width direction Y; also in the length direction X, the length of the first adapter 3 is greater than the length of the second adapter 4. So set up the area that makes the orthographic projection of first adaptor 3 on apron 11 be greater than the orthographic projection of second adaptor 4 on apron 11 to guarantee the radiating area of first adaptor 3, make when welding first adaptor 3 and first utmost point ear 21, the heat that produces can transfer fast, avoid the heat to concentrate in the welding position, avoid influencing other spare parts of battery, for example, can not lead to plastic 8 to produce the deformation down, guarantee the insulativity between apron 11 and the electrode assembly 2.

Of course, in other exemplary embodiments of the present disclosure, the width of the first adapter 3 may be larger than the width of the second adapter 4 in the width direction Y, that is, the heat dissipation area of the first adapter 3 may be increased by increasing the width of the first adapter 3 as much as possible. It is also possible to increase the heat dissipation area of the first adapter 3 by increasing the length of the first adapter 3 as much as possible by increasing the length of the first adapter 3 in the length direction X, which is longer than the length of the second adapter 4.

Referring to fig. 1, the battery may further include a first battery post 51 and a second battery post 52, wherein the first battery post 51 is connected to a side of the first adapter 3 facing away from the main body portion 23, and in particular, the first battery post 51 is welded to a side of the first adapter 3 facing away from the first tab 21; the second battery post 52 is connected to a side of the second adapter 4 facing away from the main body portion 23, and in particular, the second battery post 52 is welded to a side of the second adapter 4 facing away from the second tab 22.

Specifically, a first via hole and a second via hole are provided on the cover plate 11. A portion of the first adapter 3 penetrates the first via hole and is welded to the first battery post 51 in the first via hole, so that the first battery post 51 forms an extraction electrode of the battery. A portion of the second adapter 4 penetrates the second via hole and is welded to the second battery post 52 in the first via hole, so that the second battery post 52 forms an extraction electrode of the battery.

Referring to fig. 2, 3 and 4, the battery may further include a first welding part 61, and the first welding part 61 is connected between the first adapter 3 and the first battery post 51, that is, the first welding part 61 is used to fixedly connect the first adapter 3 and the first battery post 51; further, the first welded portion 61 and the first notch 31 are arranged along the longitudinal direction X of the battery, in the longitudinal direction X, the length of the first notch 31 is L1, the distance between the edge of the first welded portion 61 near the first notch 31 and the edge of the first adapter 3 where the first notch 31 is provided is L2, and the ratio of L1 to L2 is 0.25 or more and 0.55 or less, for example, the ratio of L1 to L2 may be 0.27, 0.3, 0.33, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, 0.5, 0.53, or the like.

If the ratio is too large, the length of the first notch 31 is too long, so that the area of the first adapter 3 is reduced, and the heat dissipation of the first adapter 3 is not facilitated; if the above ratio is too small, the length of the first notch 31 is too small to buffer vibration; moreover, the partial solid structures at both sides of the first notch 31 of the first adapter 3 are not easy to deform, which is not beneficial to the connection stability of the two first tabs 21 and the first adapter 3.

The above ratio range not only ensures the heat dissipation effect of the first adapter 3; moreover, the first notch 31 is enabled to buffer vibrations, avoiding vibrations being transmitted between the two first tabs 21, and furthermore, contributing to the robustness of the connection of the two first tabs 21 with the first adapter 3.

Similarly, the battery may further include a second welding portion 62, where the second welding portion 62 is connected between the second adapter 4 and the second battery post 52, that is, the second welding portion 62 is used to realize the fixed connection between the second adapter 4 and the second battery post 52; further, the second welding portion 62 and the second notch 41 are arranged along the length direction X of the battery, in the length direction X, the length of the second notch 41 is L3, the distance between the edge of the second welding portion 62 near the second notch 41 and the edge of the second adapter 4 where the second notch 41 is provided is L4, and the ratio of L3 to L4 is 0.2 or more and 0.7 or less, for example, the ratio of L3 to L4 may be 0.22, 0.25, 0.27, 0.3, 0.33, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, 0.5, 0.53, 0.55, 0.58, 0.6, 0.62, 0.65, 0.67, or the like.

If the ratio is too large, the length of the second notch 41 is too long, so that the area of the second adapter 4 is reduced, and the heat dissipation of the second adapter 4 is not facilitated; if the above ratio is too small, the length of the second notch 41 is too small to buffer vibration; moreover, the partial solid structures at both sides of the second notch 41 of the second adaptor 4 are not easy to deform, which is not beneficial to the connection stability of the two second lugs 22 and the second adaptor 4.

The above ratio range not only ensures the heat dissipation effect of the second adapter 4; the second recess 41 also dampens vibrations from being transmitted between the two second lugs 22, and furthermore, contributes to the stability of the connection of the two second lugs 22 to the second adapter 4.

Further, the thickness of the first adapter 3 is equal to the thickness of the second adapter 4 such that the side of the first adapter 3 facing away from the main body portion 23 is substantially coplanar with the side of the second adapter 4 facing away from the main body portion 23.

The first battery post 51 is connected to the first adaptor 3, the second battery post 52 is connected to the second adaptor 4, the first adaptor 3 and the second adaptor 4 provide coplanar base layers for the first battery post 51 and the second battery post 52, so that the length of the first battery post 51 extending out of the cover plate 11 is the same as the length of the second battery post 52 extending out of the cover plate 11, a basically coplanar base surface is provided for connection of the first battery post 51 and the second battery post 52 with the busbar after grouping of subsequent batteries, and connection stability of the first battery post 51 and the second battery post 52 with the busbar is ensured. Therefore, by increasing the thickness of the first adapter 3 to increase the heat dissipation area, other parts of the battery are greatly changed, so that the design and production of the product are complicated.

An insulator 7 is provided between the first battery post 51 and the cover plate 11, and the first battery post 51 and the cover plate 11 are insulated by the insulator 7; an insulating member 7 is arranged between the second battery post 52 and the cover plate 11, and the second battery post 52 and the cover plate 11 are insulated and isolated by the insulating member 7.

Referring to fig. 2, in some example embodiments of the present disclosure, the electrode assemblies 2 may be provided in two, i.e., one battery may include two electrode assemblies 2. The two electrode assemblies 2 are a first electrode assembly 2a and a second electrode assembly 2b; the first electrode assembly 2a and the second electrode assembly 2b are arranged in the battery case 1 in the width direction Y of the battery. The first electrode assembly 2a may include a first body part 23a, one first tab 21, and one second tab 22; the second electrode assembly 2b may include a second body portion 23b, another first tab 21, and another second tab 22. The first tab 21 of the first electrode assembly 2a is disposed opposite to the first tab 21 of the second electrode assembly 2b and connected to the first adapter 3; the second tab 22 of the first electrode assembly 2a is disposed opposite to the second tab 22 of the second electrode assembly 2b and is connected to the second adapter 4. So arranged, the vibration amplitude is greater when the first electrode assembly 2a and the second electrode assembly 2b are subjected to vibration, respectively, during use, and the vibration needs to be buffered and absorbed through the first notch 31 and the second notch 41.

Of course, the electrode assembly 2 may be provided in three, four or more.

The "parallel" and "perpendicular" mentioned in the present utility model may be not only completely parallel and perpendicular, but also may have a certain error; for example, the included angle between the two is greater than or equal to 0 ° and less than or equal to 5 °, i.e. the two are considered to be parallel to each other; the included angle between the two is more than or equal to 85 degrees and less than or equal to 95 degrees, namely the two are considered to be mutually perpendicular.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure 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 examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A battery, comprising:

a battery case including a cap plate;

the electrode assembly is arranged in the battery shell and comprises a main body part, at least two first lugs and at least two second lugs, and the at least two first lugs and the at least two second lugs are connected to the main body part;

the first connecting piece comprises at least two first connecting parts, a first notch is arranged between every two adjacent first connecting parts, at least two first lugs are welded on at least two first connecting parts, and at least part of the first connecting piece is arranged between the main body part and the cover plate;

the second adapter comprises at least two second connecting parts, a second notch is arranged between every two adjacent second connecting parts, at least two second lugs are welded on at least two second connecting parts, and at least part of the second adapter is arranged between the main body part and the cover plate;

the melting point of the first adapter is larger than that of the second adapter, and the orthographic projection area of the first notch on the cover plate is smaller than that of the second notch on the cover plate.

2. The battery according to claim 1, wherein a width of the first notch is smaller than a width of the second notch in a width direction of the battery; and/or, in the length direction of the battery, the length of the first notch is smaller than that of the second notch, the length direction is the direction that the first adapter points to the second adapter, and the width direction is the direction that one first connecting part points to the adjacent other first connecting part.

3. The battery of claim 2, wherein the first notch has a width of 5 mm or more and 10 mm or less; and/or, the length of the first notch is greater than or equal to 7 mm and less than or equal to 15 mm.

4. The battery of claim 2, wherein the width of the second notch is 6 mm or more and 16 mm or less; and/or, the length of the second notch is greater than or equal to 5 mm and less than or equal to 19 mm.

5. The battery according to any one of claims 1 to 4, characterized in that the battery further comprises:

the first battery pole is connected to one side of the first adapter, which faces away from the main body part;

and the second battery pole is connected to one side of the second adapter, which is away from the main body part.

6. The battery of claim 5, wherein the battery further comprises:

the first welding part is connected between the first transfer piece and the first battery pole, and the first welding part and the first notch are arranged along the length direction of the battery; in the length direction, the length of the first notch is L1, the distance between the edge of the first welding part, which is close to the first notch, and the edge of the first notch, which is arranged by the first adapter, is L2, the ratio of L1 to L2 is more than or equal to 0.25 and less than or equal to 0.55, and the length direction is the direction that the first adapter points to the second adapter.

7. The battery of claim 5, wherein the battery further comprises:

the second welding part is connected between the second adapter and the second battery pole, and the second welding part and the second notch are arranged along the length direction of the battery; in the length direction, the length of the second notch is L3, the distance between the edge of the second welding part, which is close to the second notch, and the edge of the second notch, which is arranged by the second adapter, is L4, the ratio of L3 to L4 is more than or equal to 0.2 and less than or equal to 0.7, and the length direction is the direction that the first adapter points to the second adapter.

8. The battery of claim 5, wherein the thickness of the first adapter is equal to the thickness of the second adapter.

9. The battery according to any one of claims 1 to 4, wherein the electrode assembly comprises:

a first electrode assembly including a first body portion, the first tab, and the second tab;

a second electrode assembly including a second body portion, the first tab, and the second tab; the second electrode assembly and the first electrode assembly are arranged in the battery case in a width direction of the battery, the width direction being a direction in which one of the first connection parts points to an adjacent other of the first connection parts.

10. The battery of any one of claims 1-4, wherein the first tab is a copper tab and the second tab is an aluminum tab; the first adapter is a copper adapter, and the second adapter is an aluminum adapter.