CN220106826U

CN220106826U - Battery cell

Info

Publication number: CN220106826U
Application number: CN202321491580.XU
Authority: CN
Inventors: 赵冬
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-06-12
Filing date: 2023-06-12
Publication date: 2023-11-28
Anticipated expiration: 2033-06-12

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: an electrode lead-out structure comprising a pole assembly; the battery cell comprises a battery cell main body and a first tab, the first tab extends out of the battery cell main body, a reinforcing part is arranged on the first tab, and the first tab is connected with the pole column assembly through direct resistance welding. Through being provided with the enhancement portion on first utmost point ear, can improve the structural strength of first utmost point ear to after first utmost point ear and utmost point post subassembly resistance welding, even the utmost point post subassembly pulls first utmost point ear, also can reduce the risk that first utmost point ear takes place to tear, and then can effectively improve the safe handling ability 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, the battery can comprise a battery core and an electrode lead-out structure, and the electrode lug of the battery core and the electrode lead-out structure can be welded and connected, so that the connection strength of the electrode lug and the electrode lead-out structure is ensured, however, in the use process of the battery, when the electrode lead-out structure vibrates, the force can be transmitted to the electrode lug, and the electrode lug is easy to break, so that the safe use performance of the battery is affected.

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:

an electrode lead-out structure comprising a pole assembly;

the battery cell comprises a battery cell main body and a first tab, the first tab extends out of the battery cell main body, a reinforcing part is arranged on the first tab, and the first tab is connected with the pole column assembly through direct resistance welding.

The battery of the embodiment of the utility model comprises an electrode lead-out structure and a battery cell, wherein the electrode lead-out structure is electrically connected with the battery cell. Through being provided with the enhancement portion on first utmost point ear, can improve the structural strength of first utmost point ear to after the utmost point post subassembly direct resistance welding connection of first utmost point ear and electrode extraction structure, even the utmost point post subassembly pulls first utmost point ear, also can reduce the risk that first utmost point ear takes place to tear, and then can effectively improve the safe handling ability 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 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 a schematic structural view of a battery cell of a battery according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a battery cell; 11. a cell body; 12. a first tab; 121. a reinforcing part; 122. a large surface; 13. a second lug; 20. a pole assembly; 30. and a battery case.

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 and 2, comprising: an electrode lead-out structure including a post assembly 20; the battery cell 10, the battery cell 10 includes electric core main part 11 and first utmost point ear 12, and first utmost point ear 12 extends out by electric core main part 11, is provided with the reinforcing part 121 on the first utmost point ear 12, and first utmost point ear 12 and utmost point post subassembly 20 direct resistance welding connect.

The battery of one embodiment of the present utility model includes an electrode lead-out structure and a cell 10, the electrode lead-out structure being electrically connected to the cell 10. Through being provided with the reinforcing part 121 on first utmost point ear 12, can improve the structural strength of first utmost point ear 12 to after the direct resistance welding connection of the utmost point post subassembly 20 of first utmost point ear 12 and electrode extraction structure, even utmost point post subassembly 20 pulls first utmost point ear 12, also can reduce the risk that first utmost point ear 12 takes place to tear, and then can effectively improve the safe handling ability of battery.

It should be noted that, the battery cell 10 includes a battery cell main body 11 and a first tab 12, and the first tab 12 is electrically connected to an electrode lead-out structure, for example, the electrode lead-out structure may be a terminal assembly 20, or the electrode lead-out structure may further include a battery housing, and the terminal assembly 20 may be electrically connected to the battery housing. Alternatively, the electrode lead-out structure may further include a bus bar, and the electrode post assembly 20 may be electrically connected to the bus bar, and the bus bar may be used for electrical connection of at least two batteries.

The first tab 12 is connected with the pole component 20 through direct resistance welding, namely, the first tab 12 is not required to be electrically connected with the pole component 20 through a separate switching piece, the first tab 12 is connected with the pole component 20 through direct resistance welding, the first tab 12 can be directly stressed with the pole component 20, the thickness of the pole component 20 can be large, the strength can be high, the buffer is small in the connection process of the first tab 12 and the pole component 20, the risk that the stress is directly transferred to cause tearing of the first tab 12 exists, in the embodiment, the structural strength of the first tab 12 can be effectively improved through the reinforcing part 121 arranged on the first tab 12, the risk of tearing of the first tab 12 can be reduced, and the safe service performance of a battery can be effectively improved.

As shown in fig. 2, the first tab 12 is provided with the reinforcing portion 121, when the first tab 12 is in resistance welding with the pole assembly 20, the first tab 12 can be guaranteed to have enough overcurrent capacity, structural damage of the first tab 12 is avoided, connection stability between the first tab 12 and the pole assembly 20 can be guaranteed, and in the process of charging and discharging the battery, the first tab 12 can also have enough overcurrent capacity, so that the safe service performance of the battery is improved. And when the battery shakes, even if the electrode lead-out structure transmits force to the first tab 12, the risk of tearing the first tab 12 can be reduced due to the existence of the reinforcing part 121.

As shown in fig. 1, the electrode lead-out structure includes a pole component 20, where the pole component 20 and the first tab 12 are directly resistance welded, so that not only the number of components used can be reduced and the overall energy density of the battery can be improved, but also the connection capability between the pole component 20 and the first tab 12 can be ensured, and the manufacturing efficiency of the battery can be improved.

The post assembly 20 is directly resistance welded to the first tab 12, i.e., the tab-like structure associated therewith can be eliminated, thereby reducing the number of components used.

In one embodiment, the reinforcement portion 121 is concave, so that the structural strength of the first tab 12 can be effectively improved, and the concave is easier to form, so that the forming efficiency of the battery cell 10 can be improved to a certain extent.

The recess in the first tab 12 may be formed by stamping, for example, the first tab 12 may include a plurality of individual tabs, which may be metal foil, and the recess may be formed by stamping the metal foil.

In one embodiment, the first tab 12 includes two opposite large surfaces 122, and the recess is formed on one large surface 122 of the two large surfaces 122, that is, only from one large surface 122 of the first tab 12 during the process of forming the reinforcing portion 121, so that the problem of structural damage of the first tab 12 caused by overlapping treatment can be avoided.

When the cell main body 11 is in a rectangular structure, after the first tab 12 is straightened, the large surface 122 of the first tab 12 may be parallel to the large surface of the cell main body 11, and the large surface of the cell main body 11 is the surface with the greatest heat generation of the cell 10.

In one embodiment, the orthographic projection of the reinforcing portion 121 toward the first tab 12 includes at least one of a circle and a bar, the circle of the reinforcing portion 121 can achieve significant reinforcement of the structure of the first tab 12, and the bar of the reinforcing portion 121 can ensure the flatness of the large surface 122 of the first tab 12, so as to improve the overall structural performance of the first tab 12, facilitate the subsequent resistance welding of the first tab 12 and the tab post assembly 20, and improve the connection capability of the first tab 12 and the tab post assembly 20, thereby ensuring the safety performance of the battery.

In one embodiment, the orthographic projection includes a circular shape and a bar shape, and the circular shape and the bar shape are arranged at intervals, so that not only the structural reinforcement of the first tab 12 can be realized, but also the flatness of the first tab 12 can be ensured, and the structural damage to the first tab 12 caused by the coincidence between the reinforcing parts 121 can be avoided, thereby improving the structural strength of the first tab 12.

In one embodiment, the ratio of the circular area to the strip-shaped area is 0.8-1.2, so that the circular area and the strip-shaped area can be ensured to be basically consistent, the problem of overlarge gap is avoided, the forming is convenient, the reliable reinforcement of the first tab 12 can be ensured, and the flatness of the first tab 12 can be ensured to a certain extent.

The ratio of the area of the circle to the area of the bar may be 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15 or 1.2, etc.

In one embodiment, the strip shape is rectangular, that is, the reinforcing portion 121 may be substantially rectangular, so that not only the structural reinforcement of the first tab 12 may be ensured, and the overall flatness of the large surface of the first tab 12 may be improved, but also the formation of the reinforcing portion 121 may be facilitated, and the manufacturing efficiency of the battery may be improved to some extent.

It should be noted that the extending direction of the strip may be substantially linear, for example, the strip may be rectangular, or the strip may be substantially rectangular, and at least one end of the rectangle may include a curve. Alternatively, the extending direction of the bar may be a fold line type, for example, the extending direction of the bar may be a curve type, or the extending direction of the bar may be a circular arc curve, or the extending direction of the bar may be a straight fold line type, or the like, with emphasis on the bar being given to the fact that the bar may be formed in a shape having a length and a width dimension.

In one embodiment, the first tab 12 is a negative electrode tab, and the reinforcing portion 121 is disposed on the negative electrode tab, so that the structural strength of the negative electrode tab can be effectively improved.

The negative electrode tab may be a copper foil, and the positive electrode tab may be an aluminum foil, and the structural strength of the copper foil may be effectively improved by providing the reinforcing part 121 on the copper foil.

In one embodiment, as shown in fig. 2, the reinforcing parts 121 may be plural, and the plural reinforcing parts 121 may be disposed on the first tab 12 at intervals, so that the structural strength of the first tab 12 may be significantly improved.

As shown in fig. 2, three reinforcing portions 121 may be disposed on the first tab 12, and further, the reinforcing portions 121 are disposed on the large surface 122 of the first tab 12.

In one embodiment, as shown in fig. 2, the battery cell 10 further includes a second tab 13, the polarities of the first tab 12 and the second tab 13 are opposite, and the first tab 12 and the second tab 13 disposed at intervals extend from the same end of the battery cell main body 11, so that the height space occupation ratio of the first tab 12 and the second tab 13 can be reduced, thereby reducing the overall height of the battery cell 10, further improving the height space utilization ratio of the battery, and further improving the energy density of the battery.

One of the first tab 12 and the second tab 13 may be a positive electrode tab, the other may be a negative electrode tab, one of the first tab 12 and the second tab 13 may be electrically connected with the electrode post assembly, and the other may be electrically connected with the battery case.

The battery may include two post assemblies 20, the two post assemblies 20 may be positive and negative posts, respectively, and the first and second tabs 12 and 13 may be connected to the positive and negative posts, respectively.

As shown in fig. 2, the first tab 12 may be provided with a reinforcing portion 121, and the second tab 13 may not be provided with a reinforcing portion 121. Of course, in some embodiments, the first tab 12 may be provided with a reinforcing portion 121, and the second tab 13 may also be provided with a reinforcing portion 121.

It should be noted that, in some embodiments, the first tab 12 and the second tab 13 may extend from opposite ends of the cell main body 11.

In one embodiment, as shown in fig. 1, the battery further includes a battery housing 30, and two pole assemblies 20 may be disposed on the battery housing 30, one or more battery cells 10 may be disposed within the battery housing 30, for example, two battery cells 10 may be disposed within the battery housing 30.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an 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 quadrangular prism type battery, and the quadrangular prism type battery mainly refers to a prism shape, but whether each side of the prism is a straight line in a strict sense is not strictly limited, and corners between sides are not necessarily right angles, and may be arc transition.

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 10 is a laminated battery cell, and the battery cell has a first pole piece, a second pole piece opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form a laminated battery cell.

Alternatively, the battery may be a wound battery, and specifically, the battery cell 10 is a wound battery cell, that is, a first pole piece, a second pole piece opposite to the first pole piece, and a diaphragm 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, or the battery may be a hexagonal-prism-type battery. The battery cell 10 may be a winding type battery cell, that is, a first pole piece, a second pole piece opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

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

The battery of the battery pack according to one embodiment of the present utility model includes an electrode lead-out structure and a battery cell 10, the electrode lead-out structure being electrically connected with the battery cell 10. Through being provided with the reinforcing part 121 on first utmost point ear 12, can improve the structural strength of first utmost point ear 12 to after first utmost point ear 12 and electrode extraction structure resistance welding's utmost point post subassembly 20 direct resistance welding connection, even utmost point post subassembly 20 pulls first utmost point ear 12, also can reduce the risk that first utmost point ear 12 takes place to tear, and then can effectively improve the safe handling ability of group 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 can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries.

It should be noted that, a plurality of batteries may be disposed in the battery case after forming the battery module, and may be fixed by the end plate and the side plate. The plurality of cells may be disposed directly in the cell case, i.e., without grouping the plurality of cells, at which time the end plates and the side plates may be removed.

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:

an electrode lead-out structure comprising a pole assembly (20);

the battery cell (10), electric core (10) include electric core main part (11) and first utmost point ear (12), first utmost point ear (12) by extend on electric core main part (11) and go out, be provided with enhancement portion (121) on first utmost point ear (12), first utmost point ear (12) with utmost point post subassembly (20) direct resistance welding connects.

2. The battery according to claim 1, wherein the reinforcement (121) is concave.

3. The battery according to claim 2, wherein the first tab (12) includes two opposing large surfaces (122), one (122) of the large surfaces (122) having the recess formed therein.

4. A battery according to any one of claims 1 to 3, characterized in that the orthographic projection of the reinforcement (121) toward the first tab (12) comprises at least one of a circular shape and a bar shape.

5. The battery of claim 4, wherein the orthographic projection comprises the circle and the bar, the circle and the bar being spaced apart.

6. The battery of claim 5, wherein the ratio of the area of the circular shape to the area of the bar shape is 0.8-1.2.

7. The battery of claim 4, wherein the strip is rectangular.

8. A battery according to any one of claims 1 to 3, wherein the first tab (12) is a negative tab.

9. A battery according to any one of claims 1 to 3, wherein the battery is a quadrangular battery.

10. The battery according to claim 9, characterized in that the cell (10) is a laminated cell or the cell (10) is a wound cell.