Battery cell cover plate, battery cell and battery pack

Abstract

The utility model provides a battery cell cover plate, a battery cell and a battery pack, and belongs to the field of battery structures. The battery cell cover plate comprises a plate body assembly which forms a cavity, and the top end and the bottom end of the cavity in the height direction are respectively provided with an anti-explosion valve and a plurality of through holes; the protective part is located in the cavity, abutting parts are formed on at least two side portions of the protective part, and the abutting parts abut against the inner wall of the cavity correspondingly, so that the protective part is in interference fit with the cavity; the projection of the protection part at the bottom end of the cavity can completely cover the through hole.

Description

Technical Field

[0001] This application relates to the field of battery structures, and more particularly to a cell cover plate, a cell, and a battery pack. Background Art

[0002] As Figure 1 shown, in an existing cell, a cavity is formed between an end plate of the cell cover plate and an explosion-proof valve, and the electrolyte inside the cell will gather in the cavity through through-holes on the end plate. When the cell is shaken under the influence of the outside world, the electrolyte in the cavity will also shake accordingly, so that the electrolyte continuously impacts the explosion-proof valve, which is extremely likely to cause damage to the explosion-proof valve, and situations such as cell leakage and premature opening of the explosion-proof valve that affect the safety performance of the cell will occur. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a cell cover plate, a cell, and a battery pack to solve the problem that the electrolyte in the cavity of the existing cell cover plate is extremely likely to cause damage to the explosion-proof valve and affect the safety performance of the cell.

[0004] According to a first aspect of the present utility model, a cell cover plate is provided, wherein the cell cover plate includes:

[0005] a plate body assembly forming a cavity, with an explosion-proof valve and a plurality of through-holes respectively provided at the top and bottom in the height direction of the cavity; and

[0006] a protection member located in the cavity, with abutting portions formed at at least two side portions of the protection member, and the abutting portions correspondingly abut against the inner wall of the cavity so that the protection member is in interference fit with the cavity;

[0007] a projection of the protection member at the bottom of the cavity can completely cover the through-holes.

[0008] Preferably, the plate body assembly includes a first end plate, an insulating member, and a second end plate connected in sequence, the explosion-proof valve is provided at the first end plate, and the through-holes are formed at the second end plate; the protection member is in interference fit with the insulating member.

[0009] Preferably, a placement groove is formed at the top of the insulating member facing the first end plate, and the placement groove is formed as a polygonal groove; a through-hole penetrating the insulating member is formed at the bottom of the placement groove.

[0010] Preferably, the protection member is located in the placement groove, and the abutting portions abut against the inner wall of the placement groove.

[0011] Preferably, the protection member includes a protection plate, and the protection plate is formed as a rectangular plate-like structure extending along the width direction of the placement groove, and the abutting portions are respectively formed at both ends in the extending direction of the protection plate.

[0012] Preferably, each of the abutting portions includes a plurality of interference ribs protruding from the protection plate, and the interference ribs are arranged vertically and / or obliquely; when the protection plate is connected to the insulating member, the interference ribs abut against the inner wall of the placement groove;

[0013] The interference rib is formed into an arc-shaped convex structure, and / or a wavy convex structure, and / or a square convex structure.

[0014] Preferably, the protection member further includes a plurality of baffles, and a plurality of the baffles are respectively arranged on both sides in the extending direction of the protection plate.

[0015] Preferably, the interference amount of the protection member is 0.05 mm to 0.2 mm.

[0016] According to a second aspect of the present invention, a battery cell is provided, wherein the battery cell is provided with the battery cell cover plate as described above.

[0017] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell as described above.

[0018] According to the battery cell cover plate, the battery cell and the battery pack of the present invention, a protection member is inserted into the cavity of the plate body assembly, and the projection of the protection member at the bottom end of the cavity can completely cover the through hole, so that the electrolyte flowing into the cavity through the through hole will not directly impact on the explosion-proof valve, that is, the protection member can greatly weaken the impact of the electrolyte on the explosion-proof valve, thereby effectively avoiding damage to the explosion-proof valve and ensuring the use safety of the battery cell. In addition, the protection member in the present invention abuts against the inner wall of the cavity through the abutting portion, so that the protection member is in interference fit with the cavity, so as to ensure the stability of the protection member after assembly and facilitate the realization of its anti-impact effect.

[0019] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following specific embodiments are given below in conjunction with the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic diagram of a battery cell cover plate in the prior art;

[0022] Figure 2Exploded view of the battery cell cover plate according to an embodiment of the present utility model;

[0023] Figure 3 Cross-sectional view of the battery cell cover plate according to an embodiment of the present utility model;

[0024] Figure 4 Schematic diagram of the protective member according to an embodiment of the present utility model.

[0025] Icons: 1 - First end plate; 10 - Explosion-proof valve; 2 - Insulating member; 20 - Placing groove; 21 - Through hole; 3 - Second end plate; 30 - Through hole; 4 - Protective member; 40 - Protective plate; 41 - Baffle; 42 - Interference rib. Detailed implementation manners

[0026] The following detailed implementation manners are provided to help readers obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0027] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0028] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, it can be directly "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0029] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0030] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section as referred to in the examples described herein may also be termed a second component, element, region, layer, or section without departing from the teachings of the examples.

[0031] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "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 at other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0032] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described herein are not limited to the specific shapes shown in the figures, but include changes in shape that occur during manufacturing.

[0034] The features of the examples described herein may 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 a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0035] According to a first aspect of the present utility model, there is provided a battery cell cover plate, as Figures 2 to 4As shown in the figure, the cell cover plate in this embodiment includes a plate body assembly and a protective member 4 that is in interference fit with the plate body assembly. Through the protective member 4, the impact force of the electrolyte on the explosion-proof valve 10 can be effectively reduced to ensure the use safety of the cell. In the following, the specific structures of the above-mentioned parts of the cell cover plate according to the present utility model will be described in detail.

[0036] In this embodiment, the plate body assembly includes a first end plate 1, an insulating member 2, and a second end plate 3 that are sequentially connected. A cavity is formed between the first end plate 1 and the second end plate 3. Further, an explosion-proof valve 10 is provided at the first end plate 1, and a plurality of through holes 30 are provided at the second end plate 3. The explosion-proof valve 10 and the plurality of through holes 30 are respectively located at the top and bottom of the cavity in the height direction. It should be noted that the above structures of the plate body assembly are all conventional structures of existing cells, so they will not be described in detail.

[0037] Specifically, as Figures 2 to 3 shown, a placement groove 20 is formed at the top of the insulating member 2 facing the first end plate 1 in this embodiment. Based on the arrangement of multiple rows and columns of the through holes 30, the placement groove 20 is formed into a rectangular parallelepiped-shaped groove to facilitate the protective member 4 to achieve its protective effect. Further, a through hole 21 penetrating the insulating member 2 is formed at the bottom of the placement groove 20 to form the above-mentioned cavity.

[0038] In this embodiment, the protective member 4 is disposed in the above-mentioned placement groove 20, and abutting portions corresponding to the inner walls of the placement groove 20 are formed at its two side portions, so that the protective member 4 is in interference fit with the placement groove 20. Specifically, the protective member 4 includes a protective plate 40, and the protective plate 40 is formed into a rectangular parallelepiped plate-like structure extending along the width direction of the placement groove 20, and the abutting portions are respectively formed at both ends in its extending direction. It should be noted that the specific connection position of the protective member 4 and the placement groove 20 is not fixed, as long as the projection of the protective member 4 at the second end plate 3 can completely cover the through holes 30 to facilitate its blocking of the electrolyte, and then achieve its protective effect on the explosion-proof valve 10.

[0039] In this embodiment, as Figure 4 shown, each abutting portion includes a plurality of interference ribs 42 protruding from the protective plate 40. Each interference rib 42 is formed into an arc-shaped protruding structure and is vertically arranged, and the plurality of interference ribs 42 are arranged at intervals; when the protective plate 40 is connected to the insulating member 2, each interference rib 42 abuts against the inner wall of the placement groove 20. It should be noted that the number, shape, and arrangement of the interference ribs 42 are not specifically limited. For example, the interference rib 42 can also be inclined, and it can also be formed into a wavy protruding structure or a square protruding structure, as long as the interference rib 42 can abut against the inner wall of the placement groove 20 to ensure the connection stability of the protective member 4. Preferably, the interference amount T of this protective member 4 is 0.05 mm to 0.2 mm (asFigure 3 as shown

[0040] Furthermore, the protective member 4 further includes a plurality of baffles 41. A plurality of baffles 41 are respectively arranged on both sides in the extending direction of the above-mentioned protective plate 40. The end of the baffle 41 away from the protective plate 40 can also be provided with the above-mentioned abutting portion to increase the stability of the protective member 4 during assembly.

[0041] It should be noted that there are no specific restrictions on the material and formation method of the protective member 4, as long as the above-mentioned technical effects can be achieved.

[0042] Through the cell cover plate of the present utility model as described above, a protective member 4 is inserted into the cavity of the plate body assembly. The projection of the protective member 4 at the bottom end of the cavity can completely cover the through hole 30, so that the electrolyte flowing into the cavity through the through hole 30 will not directly impact on the explosion-proof valve 10. That is, the protective member 4 can greatly weaken the impact of the electrolyte on the explosion-proof valve 10, thereby effectively avoiding damage to the explosion-proof valve 10 and ensuring the use safety of the cell. In addition, the protective member 4 in the present utility model is correspondingly abutted against the inner wall of the cavity through the abutting portion, so that the protective member 4 is in interference fit with the cavity, so as to ensure the stability of the protective member 4 after assembly and facilitate the realization of its anti-impact effect.

[0043] In addition, according to the second aspect of the present utility model, a cell is provided, wherein the cell is provided with the above-mentioned cell cover plate.

[0044] In addition, according to the third aspect of the present utility model, a battery pack is provided, wherein the battery pack is provided with the above-mentioned cell.

[0045] Finally, it should be noted that the above-mentioned embodiments are only specific implementation manners of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed in the present application can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be the protection scope defined by the claims.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: A plate assembly is formed with a cavity, wherein the top and bottom ends of the cavity in the height direction are respectively provided with an explosion-proof valve and a plurality of through holes; and A protective member is located in the cavity, and abutment portions are formed at at least two side portions of the protective member, and the abutment portions abut against the inner wall of the cavity correspondingly, so that the protective member and the cavity are interference fit; The projection of the protection member at the bottom end of the cavity can completely cover the through hole.

2. The cell cover plate according to claim 1, characterized in that: The plate assembly includes a first end plate, an insulating member, and a second end plate connected in sequence, the explosion-proof valve is arranged at the first end plate, the through hole is formed at the second end plate; the protective member is interference-fitted with the insulating member.

3. The cell cover plate according to claim 2, characterized in that: A placement groove is formed on the top of the insulating member facing the first end plate, and the placement groove is formed as a polygonal groove; a through hole penetrating the insulating member is formed at the bottom of the placement groove.

4. The cell cover plate according to claim 3, characterized in that: The protective member is located in the placement groove, and the abutting portion abuts against an inner wall of the placement groove.

5. The cell cover plate according to claim 4, characterized in that: The protective member comprises a protective plate, which is formed into a rectangular plate-shaped structure extending along the width direction of the placement groove, and the abutment portions are respectively formed at both ends of the protective plate in the extending direction.

6. The cell cover plate according to claim 5, characterized in that: Each of the abutting portions includes a plurality of interference ribs protruding from the protective plate, and the interference ribs are arranged vertically and / or inclined; when the protective plate is connected to the insulating member, the interference ribs abut against the inner wall of the placement groove; The interference ribs are formed as arc-shaped protruding structures, and / or wave-shaped protruding structures, and / or square protruding structures.

7. The cell cover plate according to claim 5, characterized in that: The protective member further comprises a plurality of baffles, and the plurality of baffles are respectively arranged on both sides of the extending direction of the protective plate.

8. The cell cover plate according to claim 1, characterized in that: The interference fit of the protective element is 0.05 mm to 0.2 mm.

9. A battery cell, characterized in that: The battery cell is provided with a battery cell cover according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery cell as claimed in claim 9.

Images