CN219534841U

CN219534841U - Battery cell

Info

Publication number: CN219534841U
Application number: CN202320324881.7U
Authority: CN
Inventors: 王珂; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-08-15
Anticipated expiration: 2033-02-27

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: the battery shell is provided with a liquid injection hole; the pressure relief structure is arranged on the battery shell to shield the liquid injection hole; the pressure release structure comprises a first part and a second part, the strength of the first part is smaller than that of the second part, so that the first part can be damaged when the battery is subjected to fluid infusion, and the electrolyte can be supplemented through the fluid injection hole, so that the normal use of the battery is ensured, and the service life of the battery is prolonged.

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 secondary injection is required to be performed on the battery after the battery is used for a long time, but the secondary injection is not convenient due to the structural limitation of the current battery.

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:

the battery shell is provided with a liquid injection hole;

the pressure relief structure is arranged on the battery shell to shield the liquid injection hole;

the pressure release structure comprises a first part and a second part, wherein the strength of the first part is smaller than that of the second part, so that the first part can be damaged when the battery is replenished with liquid.

The battery comprises a battery shell and a pressure relief structure, wherein the battery shell is provided with a liquid injection hole, the pressure relief structure is arranged on the battery shell to shield the liquid injection hole, so that sealing protection of the liquid injection hole is realized, the pressure relief structure comprises a first part and a second part, the strength of the first part is smaller than that of the second part, and therefore, when the battery needs to be subjected to liquid supplementing, the first part can be damaged, and electrolyte supplementing is realized through the liquid injection hole, so that normal use of the battery is ensured, and the service life of the battery is improved.

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 partial schematic structure of a battery according to an exemplary embodiment;

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

The reference numerals are explained as follows:

10. a battery case; 11. a liquid injection hole; 12. a first liquid injection hole; 20. a pressure relief structure; 21. a first portion; 22. a second portion; 30. a storage member; 31. a through hole; 40. and a pole assembly.

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: a battery case 10, wherein a liquid injection hole 11 is formed in the battery case 10; the pressure release structure 20 is arranged on the battery shell 10 so as to cover the liquid injection hole 11; the pressure release structure 20 includes a first portion 21 and a second portion 22, wherein the strength of the first portion 21 is smaller than that of the second portion 22, so that the first portion 21 can be damaged when the battery is replenished with liquid.

The battery of the embodiment of the utility model comprises a battery shell 10 and a pressure relief structure 20, wherein the battery shell 10 is provided with a liquid injection hole 11, the pressure relief structure 20 is arranged on the battery shell 10 to shield the liquid injection hole 11 so as to realize sealing protection of the liquid injection hole 11, the pressure relief structure 20 comprises a first part 21 and a second part 22, the strength of the first part 21 is smaller than that of the second part 22, so that the first part 21 can be damaged when the battery needs to be replenished with liquid, and electrolyte is replenished through the liquid injection hole 11, thereby ensuring normal use of the battery and improving the service life of the battery.

It should be noted that, after the battery is used for a long time, the electrolyte inside the battery case 10 consumes a relatively large amount, so in order to ensure that the battery continues to operate normally, the electrolyte needs to be replenished through the liquid injection hole 11, in this embodiment, the first portion 21 is destroyed, so that the electrolyte can be replenished through the liquid injection hole 11, thereby ensuring the normal operation of the battery.

After the first portion 21 is damaged, after the electrolyte is replenished, the filling hole 11 needs to be sealed, at this time, a new pressure relief structure may be provided on the battery case 10, for example, another installation position is provided on the battery case 10, so that resealing of the filling hole 11 may be achieved through the new pressure relief structure. The pressure relief structure may be an explosion-proof valve in the related art, for example, the pressure relief structure may be an explosion-proof sheet, the pressure relief structure may be a metal sheet, etc., which is not limited herein.

Considering that the strength of the first portion 21 is smaller than that of the second portion 22, the first portion 21 is more easily damaged than the second portion 22, and when the electrolyte is replenished into the battery, the first portion 21 can be damaged, thereby replenishing the electrolyte, and thus the service life of the battery is improved.

In one embodiment, as shown in fig. 1 and 2, a first filling hole 12 is formed in the battery case 10, and during the battery installation process, electrolyte is filled through the first filling hole 12, after the electrolyte is filled, the first filling hole 12 may be sealed by a sealing structure, and when the electrolyte is subsequently replenished, the first portion 21 needs to be destroyed, thereby replenishing the electrolyte.

In one embodiment, the thickness of the first portion 21 is less than the thickness of the second portion 22, such that the strength of the first portion 21 may be made less than the strength of the second portion 22, thereby ensuring that the first portion 21 may be more easily broken to protect against subsequent electrolyte replenishment.

In one embodiment, the first portion 21 is located in the middle of the second portion 22, which not only facilitates the destruction of the first portion 21, but also ensures the structural strength of the pressure relief structure 20, thereby ensuring that the pressure relief structure 20 can have a reliable pressure relief protection function.

The first portion 21 is located in the middle of the second portion 22, and the middle of the second portion 22 may be considered as other locations that do not intersect with the edge location of the second portion 22.

In one embodiment, as shown in fig. 1 and 2, the first portion 21 is located at the center of the second portion 22, so that the first portion 21 can be damaged conveniently, and a relatively balanced force can be raised for the second portion 22 when the first portion 21 is damaged, thereby improving the damaged capability of the first portion 21 and improving the fluid replacement efficiency of the subsequent electrolyte.

In one embodiment, the area of the first portion 21 is smaller than that of the second portion 22, so that the explosion-proof protection capability of the pressure relief structure 20 can be improved by avoiding the influence of the excessive area of the first portion 21 on the overall explosion-proof capability of the pressure relief structure 20 on the basis of ensuring that the first portion 21 can be damaged.

In one embodiment, the pressure relief structure 20 is composed of the first portion 21 and the second portion 22, which is simple in structure, and the connection of the pressure relief structure 20 and the battery case 10 can be conveniently achieved, and at this time, the second portion 22 can be connected with the battery case 10, for example, the second portion 22 can be welded to the battery case 10.

In one embodiment, the pressure relief structure 20 is provided with a first score and a second score, wherein the depth of the first score is greater than the depth of the second score, and the first portion 21 and the second portion 22 form a bottom wall of the first score and a bottom wall of the second score, respectively, such that the strength of the first portion 21 is less than the strength of the second portion 22, and such that the first portion 21 may be more easily broken.

The depth of the first score may be greater than 0 and the depth of the second score may be equal to 0, or the depth of the second score may be greater than 0, but it is desirable to ensure that the depth of the first score is greater than the depth of the second score.

In one embodiment, the pressure relief structure 20 is integrally formed with at least a portion of the battery case 10, so that not only the manufacturing efficiency of the battery can be improved, but the pressure relief structure 20 can be conveniently formed, for example, by removing material from the battery case 10, thereby achieving local thinning of the battery case 10, and forming a weak portion of the pressure relief structure 20, where the weak portion is a score.

In one embodiment, the pressure relief structure 20 is formed separately from the battery housing 10 so that the pressure relief structure 20 can be attached to the battery housing 10 as desired.

The pressure release structure 20 is welded on the battery shell 10, so that the connection stability of the pressure release structure 20 and the battery shell 10 is ensured; alternatively, the pressure relief structure 20 may be bonded to the battery case 10.

In one embodiment, as shown in fig. 2, the battery further includes a storage member 30, where the storage member 30 is located inside the battery case 10 and is disposed opposite to the injection hole 11, and a through hole 31 is provided on the storage member 30, so that the storage member 30 can also realize storage of the first portion 21 on the basis that the electrolyte can be injected into the battery case 10 normally through the through hole 31, and the first portion 21 is prevented from falling into the battery case 10.

In one embodiment, the bottom wall of the storage element 30 is inclined with respect to the end face of the liquid injection hole 11, so that the first portion 21 falling into the storage element 30 can slide to the lowest end along with the bottom wall of the storage element 30, thereby avoiding the first portion 21 from forming a shielding of the through hole 31.

It should be noted that the plurality of through holes 31 may be provided, that is, the receiving member 30 may be provided with a plurality of through holes 31, and the plurality of through holes 31 may be through holes having a uniform structure, or the plurality of through holes 31 may be through holes having a non-uniform structure, thereby improving the injection capability of the electrolyte.

In one embodiment, the receiving member 30 may be a lower insulating member, so that the receiving member 30 may ensure insulation between the battery cells and the battery case 10 on the basis of forming a protection for the first portion 21.

It is noted that 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, as shown in fig. 1 and 2, the battery further includes a post assembly 40, where the post assembly 40 may be electrically connected to the battery cell, and the post assembly 40 may be two, and the two post assemblies 40 are electrically connected to the positive electrode tab and the negative electrode tab of the battery cell, respectively.

In some embodiments, it is not excluded that the battery may comprise one pole assembly 40, one tab of the cell may be electrically connected to the pole assembly 40, and the other tab of the cell may be electrically connected to the battery housing 10.

The battery case 10 shown in fig. 1 and 2 may be a part of the battery case 10, and the cover plate of the battery case 10 is shown in fig. 1 and 2.

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, the battery comprises a battery shell 10 and a pressure relief structure 20, the battery shell 10 is provided with a liquid injection hole 11, the pressure relief structure 20 is arranged on the battery shell 10 to shield the liquid injection hole 11, so that sealing protection of the liquid injection hole 11 is realized, the pressure relief structure 20 comprises a first part 21 and a second part 22, the strength of the first part 21 is smaller than that of the second part 22, so that the first part 21 can be damaged when the battery needs to be replenished with liquid, and electrolyte is replenished through the liquid injection hole 11, so that normal use of the battery is ensured, and the service life of the battery is 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), wherein a liquid injection hole (11) is formed in the battery case (10);

the pressure release structure (20) is arranged on the battery shell (10) so as to cover the liquid injection hole (11);

wherein the pressure relief structure (20) comprises a first portion (21) and a second portion (22), the strength of the first portion (21) being smaller than the strength of the second portion (22) so that the first portion (21) can be broken when the battery is replenished with liquid.

2. The battery according to claim 1, characterized in that the thickness of the first portion (21) is smaller than the thickness of the second portion (22).

3. A battery according to claim 1, characterized in that the first portion (21) is located in the middle of the second portion (22).

4. A battery according to claim 3, characterized in that the first portion (21) is located at a central position of the second portion (22).

5. The battery according to claim 1, characterized in that the area of the first portion (21) is smaller than the area of the second portion (22).

6. The battery according to any one of claims 1 to 5, wherein the pressure relief structure (20) is provided with a first score and a second score, the first score having a depth greater than the second score, the first portion (21) and the second portion (22) forming a bottom wall of the first score and a bottom wall of the second score, respectively.

7. The battery according to any of claims 1 to 5, characterized in that the pressure relief structure (20) is integrally formed with at least part of the battery housing (10) and/or that the pressure relief structure (20) consists of the first part (21) and the second part (22).

8. The battery according to any of claims 1 to 5, characterized in that the pressure relief structure (20) is formed separately from the battery housing (10);

wherein the pressure relief structure (20) is welded to the battery housing (10).

9. The battery according to any one of claims 1 to 5, further comprising a receiving member (30), wherein the receiving member (30) is located inside the battery case (10) and is disposed opposite to the liquid injection hole (11), and a through hole (31) is provided in the receiving member (30).

10. The battery according to claim 9, characterized in that the bottom wall of the receiving member (30) is provided obliquely with respect to the end face of the liquid injection hole (11), and/or that the receiving member (30) is a lower insulating member.