CN219371281U

CN219371281U - Battery cell

Info

Publication number: CN219371281U
Application number: CN202320485417.6U
Authority: CN
Inventors: 孙倩倩; 张璐璐
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-07-18
Anticipated expiration: 2033-03-14

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: a battery case; the battery cell is arranged in the battery shell; the switching piece, electric core and switching piece electricity are connected, and the surface roughness of switching piece is greater than the surface roughness of copper switching piece, reduces the connection degree of difficulty of electric core and switching piece from this to can improve the preparation efficiency of battery.

Description

Battery cell

Technical Field

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

Background

In the related art, when the lug and the pole of the battery are electrically connected, the lug and the pole are connected through a switching piece, so that the connection between the lug and the pole is conveniently realized. However, the connection performance of the adapter sheet may be problematic due to the limitations of the structure of the adapter sheet itself.

Disclosure of Invention

The utility model provides a battery, which is used for improving the service performance of the battery.

The present utility model provides a battery comprising:

a battery case;

the battery cell is arranged in the battery shell;

the switching piece, electric core and switching piece electricity are connected, and the roughness of surface of switching piece is greater than copper switching piece's surface roughness.

The battery of the embodiment of the utility model comprises a battery shell, a battery core and a switching piece, wherein the battery core is arranged in the battery shell, and the battery core is electrically connected with the switching piece.

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 have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view showing a structure of a battery according to an exemplary embodiment;

fig. 2 is an exploded structural view of a battery according to an exemplary embodiment;

fig. 3 is an exploded structural view of a battery according to another exemplary embodiment.

The reference numerals are explained as follows:

10. a battery case; 20. a battery cell; 21. a first tab; 22. a second lug; 30. a transfer sheet; 40. a pole.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying 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, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

An embodiment of the present utility model provides a battery, please refer to fig. 1 to 3, including: a battery case 10; the battery cell 20, the battery cell 20 is set up in the battery shell 10; the switching piece 30, electric core 20 and switching piece 30 electricity are connected, and the roughness of surface of switching piece 30 is greater than copper switching piece's surface roughness.

The battery of the embodiment of the utility model comprises a battery shell 10, a battery core 20 and a switching sheet 30, wherein the battery core 20 is arranged in the battery shell 10, the battery core 20 is electrically connected with the switching sheet 30, and the surface roughness of the switching sheet 30 is larger than that of a copper switching sheet, so that the connection difficulty of the battery core 20 and the switching sheet 30 is reduced, and the manufacturing efficiency of the battery can be improved.

It should be noted that, the adapting piece 30 and other structures may be connected by welding, and since the surface roughness of the adapting piece 30 is greater than that of the copper adapting piece, the welding difficulty of the adapting piece 30 and other structures may be reduced, and the connection stability of the adapting piece 30 and other structures may be ensured.

For example, the surface roughness of the copper tab may be 0.025 μm to 100 μm, further, the surface roughness of the copper tab may be 1 μm to 50 μm, and the surface roughness of the tab 30 may be greater than the surface roughness of the copper tab, thereby reducing the difficulty of connection between the cell 20 and the tab 30, for example, the surface roughness of the tab 30 may be 10 μm to 40 μm.

The battery includes an electric core and an electrolyte, and is capable of performing a minimum unit of electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In one embodiment, the battery may be a square battery, that is, the battery may be a quadrangular battery, where the quadrangular battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions.

The battery can be a laminated battery, so that the battery is not only convenient to group, but also long in length. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In one embodiment, the battery may be a cylindrical battery. The battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

In one embodiment, the adapter plate 30 includes a metal plate and a metal coating, the metal coating is disposed on the metal plate, and the roughness of the metal coating is greater than that of the metal plate, so that the surface roughness of the adapter plate 30 can be ensured to be greater than that of the copper adapter plate, thereby improving the usability of the adapter plate 30 and facilitating the subsequent connection of the adapter plate 30.

In one embodiment, the metal sheet is a copper sheet, and the surface roughness of the adapter sheet 30 can be made larger than that of copper by providing a metal coating on the copper sheet.

When the adapter sheet 30 includes copper sheets, black copper oxide is formed on the surface due to easier oxidation of copper, and the copper oxide is high in temperature, so that the copper adapter sheet is high in welding temperature with other structures, the welding difficulty is increased, and in addition, the copper adapter sheet is difficult to weld due to serious light reflection caused by smooth surface. By providing the copper sheet with the metal coating, the roughness of the metal coating is greater than that of the metal sheet, so that the surface roughness of the switching piece 30 can be ensured to be greater than that of the copper switching piece, copper oxidation can be prevented and copper reflection can be avoided, thereby improving the welding performance of the switching piece 30.

The metal coating may be nickel, for example, nickel plating on the surface of the copper sheet to form the metal coating.

In one embodiment, the metal coating has a melting point lower than that of copper oxide, so that the welding of the switching piece 30 with other structures can be facilitated and timely melted, and stable connection of the switching piece 30 with other structures can be facilitated.

In one embodiment, the surface of the adapter plate 30 is provided with at least one of a bump and a pit to increase the surface roughness of the adapter plate 30.

The surface of the transfer sheet 30 may be provided with a plurality of bumps, or the surface of the transfer sheet 30 may be provided with a plurality of pits, or the surface of the transfer sheet 30 may be provided with bumps and pits, at least one of which may be a plurality of bumps and pits.

In one embodiment, at least one end of the battery core 20 is led out with a first tab 21 and a second tab 22 with opposite polarities, the first tab 21 is a negative tab, and the first tab 21 is electrically connected with the adapter piece 30, i.e. the adapter piece 30 may be a negative adapter piece, so that the first tab 21 and the adapter piece 30 may be conveniently connected.

In one embodiment, at least one end of the battery core 20 is led out with a first tab 21 and a second tab 22 with opposite polarities, and the first tab 21 is welded with the switching piece 30, so that connection stability of the first tab 21 and the switching piece 30 can be ensured, and the surface roughness of the switching piece 30 can facilitate welding of the first tab 21 and the switching piece 30.

It should be noted that, the first tab 21 and the second tab 22 with opposite polarities may extend from the same end of the battery cell 20, as shown in fig. 2 and fig. 3, so that the problem of excessive accumulation of height space caused by the extension of the first tab 21 and the second tab 22 from opposite sides of the battery cell 20 can be avoided;

alternatively, the first tab 21 and the second tab 22 with opposite polarities may extend from opposite ends of the battery cell 20, so that not only the electron transmission path is shortest, but also the transmission rate is fast and the heat generation is low, thereby improving the safety performance of the battery.

In one embodiment, as shown in fig. 2, the adapter plate 30 is electrically connected with the battery case 10, that is, the battery cell 20 may be electrically connected with the battery case 10 through the adapter plate 30, so that the battery case 10 may be used as an electrical connection terminal when the batteries are grouped, thereby facilitating the grouping of the batteries.

The first tab 21 is electrically connected with the adapter plate 30, the battery may further include a pole 40, the pole 40 may be disposed on the battery housing 10, and the pole 40 may be electrically connected with the second tab 22, so that the battery housing 10 and the pole 40 may be used as two electrode output terminals of the battery respectively.

In one embodiment, the adapter tab 30 is welded with the battery case 10, thereby securing the connection stability between the adapter tab 30 and the battery case 10, and the welding between the adapter tab 30 and the battery case 10 can be conveniently accomplished.

In one embodiment, as shown in fig. 3, the battery further includes a post 40, and the post 40 is electrically connected to the tab 30, such that the battery cell 20 can be electrically connected to the post 40 through the tab 30.

The pole 40 is welded with the adapter plate 30, thereby ensuring the connection stability between the pole 40 and the adapter plate 30.

The first tab 21 is electrically connected to the adapter tab 30, and the second tab 22 may be electrically connected to the battery case 10.

It should be noted that, when the battery case 10 is used as one electrode lead-out terminal of the battery, the number of components of the battery can be reduced, and each position of the battery case 10 can be used as an electrical connection position, thereby improving the electrical connection selectivity when the batteries are grouped. For example, when the battery case 10 is used as one electrode lead-out end of the battery, the battery may be a cylindrical battery, the post 40 of the cylindrical battery and the battery case 10 may be used as two electrode lead-out ends, and when the batteries are grouped, two bus bars with opposite polarities may be disposed at the same end of the battery case 10, for example, one bus bar is electrically connected with the battery case 10, and the other bus bar is electrically connected with the post 40, thereby being used for realizing series connection or parallel connection of a plurality of cylindrical batteries, not only facilitating efficiency when the cylindrical batteries are grouped, but also improving space utilization after the cylindrical batteries are grouped.

In one embodiment, the second tab 22 is a negative electrode tab, the negative electrode tab is electrically connected with the battery case 10, the battery case 10 is a steel case, the negative electrode tab is electrically connected with the steel case, and the corrosion potential of the steel case is higher than that of the cylindrical battery, so that the problem of electrochemical corrosion of the steel case can be avoided, for example, ions in the electrolyte can be prevented from being embedded into the lattice of the steel case.

In one embodiment, the second tab 22 is a positive electrode tab, the positive electrode tab is electrically connected with the battery case 10, the battery case 10 is an aluminum case, the positive electrode tab is electrically connected with the aluminum case, and the corrosion potential of the aluminum case is higher than that of the positive electrode of the cylindrical battery, so that the problem of electrochemical corrosion of the aluminum case can be avoided.

An embodiment of the present utility model also provides a battery pack including the above battery.

The battery pack according to one embodiment of the utility model comprises a battery, wherein the battery comprises a battery shell 10, a battery core 20 and a switching piece 30, the battery core 20 is arranged in the battery shell 10, the battery core 20 is electrically connected with the switching piece 30, and the surface roughness of the switching piece 30 is enabled to be larger than that of a copper switching piece, so that the connection difficulty between the battery core 20 and the switching piece 30 is reduced, and the manufacturing efficiency of the battery can be improved.

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 can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery may be a cylindrical battery, and the cylindrical battery may be disposed on the support plate, thereby forming a battery module.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used 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 case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

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. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected 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 battery case (10);

a battery cell (20), wherein the battery cell (20) is arranged in the battery shell (10);

the battery cell (20) is electrically connected with the switching piece (30), and the surface roughness of the switching piece (30) is larger than that of the copper switching piece.

2. The battery according to claim 1, wherein the adapter plate (30) comprises a metal plate and a metal coating layer, the metal coating layer being provided on the metal plate, the metal coating layer having a roughness greater than that of the metal plate.

3. The battery of claim 2, wherein the metal sheet is a copper sheet.

4. The battery of claim 2, wherein the metal coating has a melting point that is lower than the melting point of copper oxide.

5. The battery according to any one of claims 1 to 4, wherein the surface of the adapter sheet (30) is provided with at least one of bumps and pits.

6. The battery according to any one of claims 1 to 4, wherein at least one end of the electric core (20) is led out with a first tab (21) and a second tab (22) with opposite polarities, the first tab (21) is a negative tab, and the first tab (21) is electrically connected with the adapter piece (30).

7. The battery according to any one of claims 1 to 4, wherein at least one end of the electric core (20) is led out with a first tab (21) and a second tab (22) with opposite polarities, and the first tab (21) is welded with the adapter piece (30).

8. The battery according to any one of claims 1 to 4, characterized in that the adapter tab (30) is electrically connected with the battery housing (10).

9. The battery according to any one of claims 1 to 4, further comprising a post (40), the post (40) being electrically connected with the adapter tab (30);

wherein the pole (40) is welded to the adapter piece (30).

10. The battery according to any one of claims 1 to 4, wherein the battery is a cylindrical battery.