Battery cell cover plate, battery cell and battery cell module

Abstract

The utility model provides a battery cell cover plate, a battery cell and a battery cell module, and relates to the field of battery cell structures. The welding part is arranged to be of a structure protruding out of the top end of the battery cell cover plate main body, so that when a nickel sheet is welded, a welding head cannot be pressed on the top cover patch, namely, the problem of insufficient welding of the nickel sheet is effectively avoided, and therefore, the size of an acquisition hole can be correspondingly and effectively reduced, and the unilateral width of the top cover patch at the acquisition hole can be increased; therefore, the effective pasting area of the top cover paster and the cover plate is effectively increased, the warping risk of the top cover paster is reduced, and the stability of connection between the top cover paster and the cover plate body is improved.

Description

Technical Field

[0001] The present application relates to the field of battery cell structures, and in particular to a battery cell cover, a battery cell, and a battery cell module. Background Art

[0002] At present, in order to improve the overall energy density of the battery pack, the thickness of the battery cell is getting thinner and thinner, that is, the size of its cover is getting smaller and smaller. The battery cell cover is also integrated with poles, explosion-proof valves, liquid injection holes, battery cell temperature sensing areas and other structures that require the top cover patch to avoid. This results in the effective bonding area between the top cover patch and the cover getting smaller and smaller, especially the battery cell temperature sensing area. If the window of the top cover patch is too small, there will not be enough spacing between the nickel sheet in the temperature sensing area and the top cover patch during welding, so that part of the welding head will press on the patch and cause a cold weld (taking into account the top patch opening tolerance, equipment welding positioning tolerance, etc., the window area is required to exceed the temperature sensing welding area by more than 2mm on one side to ensure that the welding head will not press on the top cover patch); and if the window size is increased to meet the welding requirements, the patch edge at the window will be too narrow, the product defect rate during production will be high and the production cost will increase, and it will also increase the risk of the top cover patch warping and falling off after pasting. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery cover plate, a battery cell and a battery cell module to solve the problem that the current top cover patch cannot ensure both stable connection to the nickel sheet and stable bonding to the cover plate.

[0004] In accordance with the above objectives, a first aspect of the present invention provides a cell cover, wherein the cell cover comprises:

[0005] A main body, a top end of the main body being formed with a welding portion for welding a nickel sheet, the welding portion protruding from the top end of the main body; and

[0006] The top cover patch is formed with a collection hole corresponding to the welding portion.

[0007] Preferably, the protruding height of the welding portion is 1.2 mm to 1.6 mm.

[0008] Preferably, the length direction of the welding portion is the same as the length direction of the main body.

[0009] Preferably, the length of the welding portion is greater than the width of the welding portion.

[0010] Preferably, the projection of the welding portion on the top end of the main body is formed into an oblong or rectangular shape.

[0011] Preferably, when the top cover patch is correspondingly connected to the top end of the main body, the welding portion passes through the collection hole and a gap is formed between the outer side wall of the welding portion and the inner side wall of the collection hole.

[0012] Preferably, the width of the gap is 0.2 mm to 0.4 mm.

[0013] Preferably, a pole and an explosion-proof valve are further provided on the top of the main body, and the pole, the welding portion and the explosion-proof valve are sequentially arranged at intervals along the length direction of the main body.

[0014] According to a second aspect of the present invention, a battery cell is provided, wherein the battery cell includes the battery cell cover as described above.

[0015] According to a third aspect of the present invention, a battery cell module is provided, wherein the battery cell module includes the battery cell described above.

[0016] According to the battery cover, battery cell and battery module of the present invention, the welding part is set to a structure protruding from the top of the battery cover body, so that when welding the nickel sheet, the welding head will not press on the top cover patch, which effectively avoids the problem of poor soldering of the nickel sheet. Based on this, the size of the collection hole can be effectively reduced, so that the single-side width of the top cover patch at the collection hole can be increased, thereby effectively increasing the effective bonding area between the top cover patch and the cover plate, so as to reduce the risk of warping of the top cover patch, that is, improve the stability of the connection between the top cover patch and the cover body.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is an exploded view of a cell cover according to an embodiment of the present utility model;

[0020] Figure 2 Schematic diagram of a cell cover according to an embodiment of the present invention.

[0021] Icon; 1-main body; 10-pole; 11-welding part; 12-explosion-proof valve; 2-top cover patch; 20-first through hole; 21-collection hole; 22-second through hole. DETAILED DESCRIPTION

[0022] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0023] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0024] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0025] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0026] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0027] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0028] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0029] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0030] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0031] According to a first aspect of the present invention, a battery cover is provided. Figures 1 to 2 As shown, the cell cover plate in this embodiment includes a main body 1 and a top cover patch 2 disposed on top of the main body 1. The top of the main body 1 is provided with poles 10, welding portions 11, and explosion-proof valves 12 spaced apart along its length. The poles 10, welding portions 11 for welding nickel sheets, and explosion-proof valves 12 are already part of the structure of existing battery cells, so their functions and locations are not further described. Correspondingly, the top cover patch 2 is formed with a first through hole 20, a collection hole 21, and a second through hole 22 corresponding to the poles 10, welding portions 11, and explosion-proof valves 12, respectively.

[0032] Specifically, the welding portion 11 in this embodiment protrudes from the top of the main body 1, preferably with a protruding height of 1.2 mm to 1.6 mm. Due to the protruding structure of the welding portion 11, the welding head does not press on the top cover patch 2 when welding the nickel sheet, thereby effectively avoiding the problem of poor soldering of the nickel sheet. In addition, the welding portion 11 is formed into an elongated structure, for example, its projection on the top of the main body 1 is formed into an oblong or rectangular shape, but its specific structure is not fixed, as long as it can ensure the stability of the nickel sheet welding. However, the length direction of the welding portion 11 should be the same as the length direction of the main body 1, and the length of the welding portion 11 should be as large as possible. In this way, if the area of the welding portion 11 is constant (the area of the welding portion 11 is sufficient to ensure the welding effect of the nickel sheet), the width of the welding portion 11 can be minimized, thereby minimizing the width of the collection hole 21. In turn, the single-side width of the top cover patch 2 at the collection hole 21 is increased, effectively increasing the effective bonding area between the top cover patch 2 and the cover plate.

[0033] In addition, in order to ensure the welding effect of the nickel sheet, when the top cover patch 2 is connected to the top of the main body 1, the welding part 11 passes through the collection hole 21 and a gap is formed between the outer wall of the welding part 11 and the inner wall of the collection hole 21. Preferably, the width of the gap is 0.2mm~0.4mm.

[0034] It should be noted that the aforementioned numerical ranges represent optimal ranges determined after multiple experiments. Furthermore, the alignment of the collection hole 21 with the welding portion 11 means that when the top cover patch 2 is connected to the main body 1, the welding portion 11 does not interfere with the top cover patch 2. The shapes of the collection hole 21 and welding portion 11 are not fixed. For example, in this embodiment, the welding portion 11 is formed as an oblong, while the collection hole 21 is formed as a rectangle. Therefore, the aforementioned gap actually refers to the minimum distance between the outer wall of the welding portion 11 and the inner wall of the collection hole 21.

[0035] According to the battery cover of the present invention, the welding portion 11 is set as a structure protruding from the top of the battery cover body 1, so that when welding the nickel sheet, the welding head will not press on the top cover patch 2, which effectively avoids the problem of poor soldering of the nickel sheet. Based on this, the size of the collection hole 21 can be effectively reduced, so that the single-side width of the top cover patch 2 at the collection hole 21 can be increased, thereby effectively increasing the effective bonding area between the top cover patch 2 and the cover, so as to reduce the risk of warping of the top cover patch 2, that is, improve the stability of the connection between the top cover patch 2 and the cover body 1.

[0036] According to a second aspect of the present invention, a battery cell is provided, wherein the battery cell includes the battery cell cover as described above.

[0037] According to a third aspect of the present invention, a battery cell module is provided, wherein the battery cell module includes the battery cell described above.

[0038] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A battery cover, characterized in that: The battery cover comprises: A main body, a top end of the main body being formed with a welding portion for welding a nickel sheet, the welding portion protruding from the top end of the main body; and The top cover patch is formed with a collection hole corresponding to the welding portion.

2. The cell cover according to claim 1, characterized in that: The protruding height of the welding portion is 1.2 mm to 1.6 mm.

3. The cell cover according to claim 1, wherein: The length direction of the welding portion is the same as the length direction of the main body.

4. The cell cover according to claim 3, characterized in that: The length of the welding portion is greater than the width of the welding portion.

5. The battery cell cover according to claim 4, characterized in that: The projection of the welding portion on the top end of the main body is formed into an oblong shape or a rectangular shape.

6. The cell cover according to claim 1, characterized in that: When the top cover patch is correspondingly connected to the top end of the main body, the welding portion passes through the collection hole and a gap is formed between the outer side wall of the welding portion and the inner side wall of the collection hole.

7. The cell cover according to claim 6, characterized in that: The width of the gap is 0.2 mm to 0.4 mm.

8. The cell cover according to claim 1, characterized in that: A pole and an explosion-proof valve are further provided on the top of the main body. The pole, the welding portion and the explosion-proof valve are sequentially and spaced apart along the length direction of the main body.

9. A battery cell, characterized in that: The battery cell comprises the battery cell cover according to any one of claims 1 to 8.

10. A battery cell module, characterized in that: The battery cell module includes the battery cell as claimed in claim 9.

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