CN219371160U

CN219371160U - Battery cell

Info

Publication number: CN219371160U
Application number: CN202320579165.3U
Authority: CN
Inventors: 杜国艺; 李凝; 邵俊华; 刘聪毅
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-03-22
Filing date: 2023-03-22
Publication date: 2023-07-18
Anticipated expiration: 2033-03-22

Abstract

The utility model relates to the technical field of batteries, and provides a battery. The battery includes: the battery comprises a battery shell and an insulating coating, wherein an accommodating cavity for accommodating a battery core is formed in the battery shell, the insulating coating is arranged on at least part of the outer surface of the battery shell, and a plurality of concave microstructures distributed in an array are arranged on the surface of one side of the battery shell, facing the insulating coating. The battery that this application provided can strengthen the roughness of battery case surface through a plurality of concave microstructures that form array distribution at battery case's surface, and then strengthen insulating coating's adhesive power on battery case surface for insulating coating can last, carry out insulation protection to the battery effectively, promotes the security performance 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, an insulating coating is required to be arranged on the surface of a battery shell in a battery to protect the battery, so that short circuit between adjacent batteries is avoided. When the insulating coating is formed on the surface of the battery case, the adhesion ability of the insulating coating on the surface of the battery case may affect the adhesion strength and the adhesion time of the insulating coating on the surface of the battery case. If the insulating coating is detached from the surface of the battery shell, the external insulation of the battery can fail, and safety risks are extremely easy to induce.

Therefore, how to improve the adhesion capability of the insulating coating on the surface of the battery case in the battery is a technical problem to be solved.

Disclosure of Invention

The utility model provides a battery, which can improve the adhesive capacity of an insulating coating on the surface of a battery shell and even improve the safety performance of the battery.

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

according to a first aspect of the present utility model, there is provided a battery comprising: the battery comprises a battery shell and an insulating coating, wherein an accommodating cavity for accommodating a battery core is formed in the battery shell, the insulating coating is arranged on at least part of the outer surface of the battery shell, and a plurality of concave microstructures distributed in an array are arranged on the surface of one side of the battery shell, facing the insulating coating.

The battery that this application provided can strengthen the roughness of battery case surface through a plurality of concave microstructures that form array distribution at battery case's surface, and then strengthen insulating coating's adhesive power on battery case surface for insulating coating can last, carry out insulation protection to the battery effectively, promotes the security performance of battery.

Drawings

For a better understanding of the present application, 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 application. 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 structural diagram of a battery case in a battery according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic partial diagram of the battery housing of FIG. 1;

fig. 3 is a cross-sectional view of a battery provided in an embodiment of the present application;

fig. 4 is a second partial enlarged schematic diagram of the battery case of fig. 1.

The reference numerals are explained as follows:

100. a battery case; 110. a housing member, 111, annular side plates; 112. an end plate; 120. a cover plate; 200. an insulating coating; 300. concave microstructure.

Detailed Description

The technical solutions in the exemplary embodiments of the present application will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present application. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present application, 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 application.

In the description of the present application, 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/" 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 application can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, which are described in the exemplary embodiments of the present application, are described with the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present application. 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.

In a first aspect, embodiments of the present application provide a battery. Fig. 1 is a schematic structural diagram of a battery case in a battery according to an embodiment of the present disclosure; FIG. 2 is an enlarged schematic partial diagram of the battery housing of FIG. 1; fig. 3 is a cross-sectional view of a battery provided in an embodiment of the present application. As shown in fig. 1 to 3, in one implementation manner provided in the embodiment of the present application, the battery provided in the embodiment of the present application includes a battery case 100 and an insulating coating 200, where a concave microstructure 300 is disposed on a surface of the battery case 100, and at least a portion of a surface of the concave microstructure 300 is disposed with the insulating coating 200. The structure, connection manner and functional relationship of the main components of the battery according to the embodiment of the present application will be described in detail below with reference to the above-mentioned drawings.

As shown in fig. 1 to 3, a battery provided in an embodiment of the present application includes: battery case 100 and insulating coating 200. The battery case 100 is provided at the inside thereof with a receiving cavity for receiving the battery cells, at least a portion of the outer surface of the battery case 100 is provided with an insulating coating 200, and the battery case 100 is provided at a side surface facing the insulating coating 200 with a plurality of concave microstructures 300 distributed in an array.

Specifically, an accommodating cavity is provided in the battery case 100 for accommodating the battery cell; the battery case 100 is formed with a concave microstructure 300 at least at a position for disposing the insulating coating 200 to enhance the adhesion of the insulating coating 200 to the surface of the battery case 100.

It should be noted that, by forming the plurality of concave microstructures 300 distributed in an array on the surface of the battery housing 100, the battery provided in the embodiment of the present application can enhance the roughness of the surface of the battery housing 100, and further enhance the adhesion capability of the insulating coating 200 on the surface of the battery housing 100, so that the insulating coating 200 can continuously and effectively insulate and protect the battery, and improve the safety performance of the battery.

Therefore, the battery provided by the embodiment of the application can improve the adhesion capability of the insulating coating 200 on the surface of the shell, and even can improve the safety performance of the battery.

Further, it should be noted that the battery case 100 in fig. 1 is exemplarily provided in a square shape, and it should be understood that the battery case 100 may be provided in other shapes, and may be exemplarily provided in a cylindrical shape. Of course, the battery case 100 may be provided in other shapes or special shapes, which will not be described herein; in preparing the insulating coating 200, the insulating coating 200 may be sprayed or brushed on the surface of the battery case 100, and preferably, the insulating coating 200 is sprayed on the surface of the battery case 100 to enhance the adhesion effect of the insulating coating 200 on the surface of the battery case 100.

In one embodiment, with continued reference to the structure shown in fig. 2 and 3, the plurality of concave microstructures 300 on the surface of the battery case 100 are in a grid shape. It is noted that, the design of the grid-like structure can enhance the uniformity of the concave microstructures 300 on the surface of the battery housing 100, so that the roughness of the battery housing 100 is consistent throughout, the adhesion capability of the insulating coating 200 on the battery housing 100 is consistent throughout, and further, the insulating coating 200 can continuously and effectively protect any position of the battery housing 100, and the surface of the battery housing 100 is guaranteed to have no protection weak point, thereby improving the safety performance and the service life of the battery.

In one embodiment, please continue with the structure shown in fig. 2, the plurality of concave microstructures 300 are arranged in sequence to form a plurality of rows; in two adjacent rows, the number of concave microstructures 300 in one row is M, and the number of concave microstructures 300 in the other row is N; and in two adjacent rows, the ith concave microstructure 300 in one row is aligned with the ith concave microstructure 300 in the other row, and M, N and i are both positive integers. M and N in this embodiment may be the same or different, and the maximum value of i is the minimum value of M and N, for example, if M is 10 and N is 9, the maximum value of i is 9.

It should be noted that, the structural design in this embodiment can reduce the manufacturing difficulty, so as to shorten the manufacturing time of the concave microstructure 300 and increase the production speed.

It should be understood that the exemplary definition of the plurality of concave microstructures 300 in the embodiments of the present application is along a "row" which is only schematically illustrated herein. For example, when the concave microstructure 300 is formed on the surface of the battery case 100, the extending direction of the "row" may be parallel to the side a1, a2 or a3 in fig. 1, and of course, an angle may be formed between the extending direction of the "row" and the side a1, a2 or a3, which is not described in detail.

Illustratively, as indicated by the dashed arrows in fig. 2, the first concave microstructure 300 of the first row corresponds to the first concave microstructure 300 of the second row, with no misalignment along the row direction.

Furthermore, it should be noted that, with continued reference to the structure shown in fig. 2, since the plurality of concave microstructures 300 are arranged along the rows, and the concave microstructures 300 in each row correspond to the concave microstructures 300 in the adjacent rows, in the present embodiment, the plurality of partitions forming the concave microstructures 300 are continuously distributed and cross-shaped.

In another embodiment, referring to the structure shown in fig. 4, a plurality of concave microstructures 300 are sequentially arranged to form a plurality of rows; in two adjacent rows, the number of concave microstructures 300 in one row is M, and the number of concave microstructures 300 in the other row is N; in two adjacent rows, the ith concave microstructure 300 in one row is arranged in a staggered manner with the ith concave microstructure 300 in the other row, and M, N and i are both positive integers. The plurality of partitions forming the concave microstructure 300 are continuously distributed around but in a non-cross shape in this embodiment.

Illustratively, as indicated by the dashed arrows in fig. 4, the first concave microstructures 300 of the first row are offset from the first concave microstructures 300 of the second row in the row direction.

It should be noted that, in the present embodiment, the concave microstructures 300 in adjacent rows are staggered, so that each place of the battery case 100 can be guaranteed to be treated in the direction of the vertical row, and the surface roughness and the adhesion can be enhanced.

In one embodiment, referring to the structures shown in fig. 2 and 3, the concave microstructure 300 is a concave microstructure 300 formed by laser etching. In the laser etching process, the concave microstructure 300 specifically includes: a part of the surface structure of the battery case 100, the formed concave microstructure 300, is removed.

It should be noted that, the battery provided in this embodiment of the present application forms the concave microstructure 300 on the surface of the battery housing 100 through the laser etching process, so as to roughen the surface of the battery housing 100 in the initial state, enhance the roughness of the surface of the battery housing 100, and further enhance the adhesion capability of the insulating coating 200 on the surface of the battery housing 100, so that the insulating coating 200 can continuously and effectively insulate and protect the battery, and improve the safety performance of the battery.

It should be appreciated that laser engraving: the name is laser engraving, wherein the laser energy of the laser beam causes chemical and physical changes of surface materials to be engraved to form marks, or the laser energy burns out part of the materials to form various patterns, characters, textures and the like to be engraved. In the embodiment of the present application, when the concave microstructure 300 is formed, one way is to perform laser etching treatment before bending the plate material to form the battery case 100; alternatively, the plate material may be subjected to laser etching treatment after forming the battery case 100 and before applying the insulating coating 200.

After the concave microstructure 300 is formed by laser engraving, many pits appear on the originally flat surface of the battery case 100, and adjacent pits are separated by the battery case 100 that is not removed. If the pits are defined as concave microstructures 300, adjacent concave microstructures 300 are separated by a partition portion formed by the battery case 100 (the partition portion is schematically partitioned by a dotted line in fig. 3).

In one embodiment, please continue to refer to the structure shown in fig. 2 and 3, the concave microstructure 300 is square. The square concave microstructure 300 can reduce the preparation difficulty and improve the preparation efficiency; and square concave microstructure 300 can promote the regularity on battery case 100 surface behind a plurality of concave microstructure 300 cooperation, guarantees that insulating coating 200 is unanimous at battery case 100 adhesion capability everywhere, and then guarantees that insulating coating 200 can form continuously, effectively protection to battery case 100 optional position, guarantees battery case 100 surface and does not have the protection weakness to promote the security performance and the life of battery.

Of course, the concave microstructure 300 may be of other shapes, and may be specifically configured according to requirements, which will not be described herein.

In one embodiment, the dimensions of the concave microstructure 300 range from 0.3X0.3 mm ² ～2×2mm ² 。

It should be noted that, by setting the dimensions of the concave microstructures 300 to be within the above range, the overall number of the concave microstructures 300 on the surface of the battery case 100 can be controlled to control the roughness of the surface of the battery case 100 within a proper range, so as to enhance the adhesion capability of the insulating coating 200 on the surface of the battery case 100, so that the insulating coating 200 can continuously and effectively insulate and protect the battery, and improve the safety performance of the battery.

It is noted that the dimensions of the concave microstructure 300 are related to the spot area of the laser, and for example, the spot area of the device may be set to 0.3x0.3mm in the preparation of forming the concave microstructure 300 ² ～2×2mm ² To laser etch the concave microstructure 300 of corresponding area on the surface of the battery case 100.

In one embodiment, with continued reference to the structure shown in FIG. 3, the ratio of the depth d2 of the concave microstructure 300 to the thickness d1 of the cell casing 100 is 1×10 ^-5 ～1×10 ^-3 . It should be understood that, for clearly illustrating the depth d2 of the concave microstructure 300, only a portion of the surface of the battery case 100 is coated with the insulating coating 200 in fig. 3, which will not be described in detail.

It should be noted that the depth d2 of the concave microstructure 300 affects the surface of the battery case 100Surface roughness, and affects the adhesion effect of the insulating coating 200 on the surface of the battery case 100. If the depth d2 of the concave microstructure 300 is too shallow, the adhesion effect of the surface of the battery case 100 of the insulating coating 200 is affected. When the ratio between the depth d2 of the concave microstructure 300 and the thickness d1 of the battery case 100 is controlled to be 1×10 ^-5 ～1×10 ^-3 In this case, the problem of adhesion of the insulating coating 200 to the surface of the battery case 100 can be well controlled, so that the insulating coating 200 can be permanently adhered to the surface of the battery case 100.

In addition, if the depth d2 of the concave microstructure 300 is too deep, it may result in removal of excessive surface structures of the battery case 100, affecting the structural strength of the battery case 100. When the ratio between the depth d2 of the concave microstructure 300 and the thickness d1 of the battery case 100 is controlled to be 1×10 ^-5 ～1×10 ^-3 In this case, the adhesion between the battery case 100 and the insulating coating 200 is enhanced without damaging the structural strength of the battery case 100, thereby improving the safety performance of the battery.

In a preferred embodiment, the ratio of the depth d2 of the concave microstructure 300 to the thickness d1 of the battery case 100 is 1×10 ^-5 ～1×10 ^-4 . The range of values may further optimize the adhesion effect of the insulating coating 200 on the surface of the battery case 100 and secure the structural strength of the battery case 100 after the concave microstructure 300 is formed.

In one embodiment, with continued reference to the structure shown in fig. 1, the battery case 100 includes a case member 110 and a cover plate 120, at least one side of the case member 110 is provided with an opening, and the cover plate 120 is snapped into the opening. The cover 120 is coupled to the housing member 110 to seal the cells.

It should be noted that, the casing member 110 and the cover plate 120 are hermetically connected to avoid the electrolyte injected into the battery casing 100 from overflowing, so as to improve the safety performance of the battery.

It should be appreciated that the housing member 110 may be provided with an opening on one side and may be provided with openings on both opposite sides. By way of example, the housing member 110 may be a cylindrical structure as shown in fig. 1, and the housing member 110 specifically includes an annular side plate 111 and an end plate 112, the end plate 112 sealing one end of the annular side plate 111, and the cover plate 120 sealing the other end opening of the annular side plate 111. The laser etching treatment is performed before the battery cell is put into the shell, so that the battery shell 100 is prevented from being heated due to laser etching, and the safety performance of the battery is prevented from being affected.

In one possible embodiment, the housing member 110 is a one-piece structure. The integrally formed structure not only simplifies the manufacturing process, but also enhances the strength of the housing member 110 to improve the service life. When the housing member 110 provided in the embodiments of the present application is applied, the battery cell can be extended into the housing member 110 from the opening side, so as to complete the battery cell housing operation.

Of course, the battery case 100 may be provided with a structure such as a pole (not shown), which may be disposed on the case member 110, or may be disposed on a separate cover plate 120, which will not be described herein.

It should be noted that, in specifically forming the battery case 100 provided in the embodiments of the present application, the case member 110 and the cover plate 120 may be processed so that: the outer surface of the cover plate 120 is provided with a concave microstructure 300; the outer surface of the housing member 110 is provided with a concave microstructure 300.

It should be noted that, since the outer surfaces of the battery are all required to be coated with the insulating coating 200, the shell member 110 and the cover plate 120 are preferably provided with the concave microstructures 300, so as to enhance uniformity of the surface of the battery shell 100 after roughening, so that roughness of the battery shell 100 is consistent everywhere, so as to ensure consistency of adhesion capability of the insulating coating 200 everywhere of the battery shell 100, and further ensure that the insulating coating 200 can continuously and effectively protect any position of the battery shell 100, and ensure that the surface of the battery shell 100 has no protection weak points, thereby improving safety performance and service life of the battery using the shell member 110.

When the housing member 110 and the cover plate 120 are subjected to laser etching treatment, at least the outer surface portions of the housing member 110 and the cover plate 120 forming the battery housing 100 are subjected to laser etching treatment, so as to ensure the adhesion effect of the insulating coating 200 on the surface of the battery housing 100.

In a specific embodiment, the housing member 110 is not provided with the concave microstructure 300 in the range of 3mm to 20mm from the opening edge. It should be noted that, when the case member 110 is welded to the cover plate 120, a welding area is formed at the connection portion between the case member 110 and the cover plate 120, and the insulating coating 200 may not be applied to the welding area in the subsequent operation, so that the concave microstructure 300 is not disposed in the position where the insulating coating 200 is not applied to the battery case 100, so as to reduce the distribution area of the concave microstructure 300, shorten the preparation time, and increase the production speed.

Of course, in specifically forming the battery case 100 provided in the embodiment of the present application, only the case member 110 may be processed so that: the outer surface of the housing member 110 is provided with a concave microstructure 300 to simplify the manufacturing process, and details thereof will not be repeated.

It should be noted that, in the battery provided in the embodiments of the present application, there are various possibilities for preparing the material of the battery case 100. By way of example, the battery case 100 may be made of aluminum, steel aluminum composites, and other aluminum-containing composites.

It should be noted that, when the preparation material of the battery case 100 includes aluminum, the overall weight of the battery can be reduced, the miniaturized design of the battery is facilitated, the difficulty of laser etching can be reduced, and the operation time of laser etching can be shortened, so as to increase the production speed.

In one embodiment, the battery provided in the embodiments of the present application further includes a battery cell, and the battery cell is disposed inside the battery case 100.

The battery cell may be formed by winding or folding, and includes a pole piece and a tab portion led out from one side of the pole piece, and the tab portion is connected to a post on the surface of the battery case 100.

In addition, the battery case 100 also contains electrolyte and other substances, which are not described in detail herein.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the application being indicated by the following claims. It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of protection of the application is limited only by the claims that follow.

Claims

1. A battery, comprising: the battery comprises a battery shell and an insulating coating, wherein an accommodating cavity for accommodating a battery core is formed in the battery shell, the insulating coating is arranged on at least part of the outer surface of the battery shell, and a plurality of concave microstructures distributed in an array are arranged on the surface of one side of the battery shell, facing the insulating coating.

2. The battery of claim 1, wherein the plurality of concave microstructures of the battery housing surface are in a grid shape.

3. The battery of claim 2, wherein a plurality of said concave microstructures are arranged in sequence to form a plurality of rows; in two adjacent rows, the number of concave microstructures in one row is M, and the number of concave microstructures in the other row is N; and in two adjacent rows, the ith concave microstructure in one row is arranged in a staggered manner with the ith concave microstructure in the other row, and M, N and i are both positive integers.

4. A cell according to any one of claims 1 to 3, wherein the concave microstructure is a concave microstructure formed by laser engraving.

5. The battery of claim 4, wherein the concave microstructure is square in shape.

6. The battery of claim 5, wherein the concave microstructure has dimensions in the range of 0.3 x 0.3mm ² ～2×2mm ² 。

7. As claimed inThe battery of 6, wherein the ratio of the depth of the concave microstructure to the thickness of the battery case is 1X 10 ^-5 ～1×10 ^-3 。

8. A battery as claimed in any one of claims 1 to 3 wherein the battery housing comprises a housing member and a cover plate, at least one side of the housing member being provided with an opening, the cover plate snap-fitting the opening;

the concave microstructure is arranged on the outer surface of the cover plate;

the outer surface of the shell member is provided with the concave microstructure.

9. The battery of claim 8, wherein the housing member is not provided with a concave microstructure in the range of 3mm to 20mm from the opening edge.

10. The battery of claim 9, further comprising a battery cell disposed within the housing member, the cover panel snap-fitting the opening of the housing member to seal the battery cell.