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 two ends of the cavity in the height direction are respectively provided with an anti-explosion valve and a plurality of through holes; an inserting part is formed on the shielding piece, and the shielding piece is correspondingly inserted into the plate body assembly; the shielding piece is inserted into the cavity, and the projection of the shielding piece at the bottom end of the cavity can completely cover the through hole. The shielding piece is inserted into the cavity of the plate body assembly, and the projection of the shielding piece at the bottom end of the cavity can completely cover the through hole, so that electrolyte flowing into the cavity from the through hole cannot directly impact the anti-explosion valve, namely, the shielding piece can greatly reduce the impact of the electrolyte on the anti-explosion valve, and further the anti-explosion valve is effectively prevented from being damaged; and the use safety of the battery cell is ensured.

Description

Technical Field

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

[0002] As Figure 1 shown, in the existing battery cell, a cavity is formed between the end plate of the battery cell cover plate and the explosion-proof valve, and the electrolyte inside the battery cell will gather in the cavity through the through holes on the end plate. When the battery 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 battery cell leakage and premature opening of the explosion-proof valve that affect the safety performance of the battery cell will occur. Summary of the Utility Model

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

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

[0005] a plate body assembly, forming a cavity, and an explosion-proof valve and a plurality of through holes are respectively arranged at two ends in the height direction of the cavity; and

[0006] a shielding member, forming a plugging portion and correspondingly plugged with the plate body assembly; the shielding member is plugged into the cavity, and the projection of the shielding member at the bottom end of the cavity can completely cover the through holes.

[0007] 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 arranged on the first end plate, and a plurality of the through holes are arranged on the second end plate; the shielding member is correspondingly plugged with the insulating member.

[0008] Preferably, a protruding portion is formed at the bottom of the insulating member facing the second end plate, and the protruding portion is formed into a polygonal, circular, or elliptical structure.

[0009] Preferably, a hollow hole with a polygonal, circular, or elliptical structure is formed on the end face of the protruding portion facing the second end plate, and the hollow hole penetrates through the top of the insulating member facing the first end plate.

[0010] Preferably, plugging holes are respectively formed at both ends of the protruding portion facing each other along the width direction of the insulating member.

[0011] Preferably, the shielding member includes a plugging plate, and plugging portions are respectively formed at both ends in the extending direction of the plugging plate to be correspondingly plugged with the two plugging holes.

[0012] Preferably, along the length direction of the insulating member, a plurality of shielding plates are respectively formed at both ends of the plug-in plate. The shielding plates extend along the length direction of the insulating member, and the plurality of shielding plates located at the same end of the plug-in plate are distributed at intervals along the width of the insulating member.

[0013] Preferably, when the shielding member is correspondingly inserted into the insulating member, the distance between the end face of the shielding member facing the first end plate and the top of the insulating member facing the first end plate is formed as T, and T≥0.5mm.

[0014] 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.

[0015] 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.

[0016] According to the battery cell cover plate, battery cell and battery pack of the present invention, a shielding member is inserted into the cavity of the plate body assembly. The projection of the shielding 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 shielding 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 shielding member in the present invention is correspondingly connected to the cavity in a plug-in manner, so that the stability of the assembly of the shielding member can be ensured, which is beneficial to achieving the technical effect of resisting the impact force of the electrolyte.

[0017] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in 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.

[0019] Figure 1 is a schematic diagram of a battery cell cover plate in the prior art;

[0020] Figure 2 is an exploded view of a battery cell cover plate according to an embodiment of the present invention;

[0021] Figure 3 is another exploded view of a battery cell cover plate according to an embodiment of the present invention;

[0022] Figure 4 It is a cross-sectional view of the battery cell cover plate according to an embodiment of the present utility model.

[0023] Icon: 1 - First end plate; 10 - Explosion-proof valve; 2 - Insulating member; 20 - Protrusion; 21 - Hollow hole; 22 - Insertion hole; 3 - Second end plate; 30 - Through hole; 4 - Shielding member; 40 - Insertion plate; 41 - Shielding plate. Detailed implementation manners

[0024] 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 this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be obvious. For example, the order of operations described herein is merely an example, which is not limited to the order set forth herein, but rather, changes that will be obvious after understanding the disclosure of this application may 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.

[0025] 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 obvious after understanding the disclosure of this application.

[0026] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "coupled 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 coupled to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0027] 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.

[0028] 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 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of this application. Additionally, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of this application.

[0033] 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 shielding member 4 that is correspondingly inserted into the plate body assembly. Through the shielding member 4, the impact force of the electrolyte on the explosion-proof valve 10 can be effectively reduced to ensure the safety of the cell during use. In the following, the specific structures of the above-mentioned parts of the cell cover plate according to the present invention will be described in detail.

[0034] In this embodiment, as Figures 2 to 3 shown, the plate body assembly includes a first end plate 1, an insulating member 2, and a second end plate 2 that are sequentially connected. A cavity is formed between the first end plate 1 and the second end plate 2. An explosion-proof valve 10 and a plurality of through holes 30 are respectively provided at both ends of the cavity in the height direction, that is, the 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 2. When the plate body assembly is assembled with other components to form a cell, the electrolyte inside the cell will flow into the cavity through the through holes 30. The above-mentioned components are the inherent structures of the existing cell cover plate, so their specific structures and the like will not be described in detail.

[0035] In this embodiment, the shielding member 4 is located inside the cavity and is correspondingly inserted into the insulating member 2. The projection of the shielding member 4 at the bottom of the cavity (i.e., the projection at the second cover plate) can completely cover the above-mentioned through holes 30. Thus, when the electrolyte shakes due to external factors such as the cell being impacted, the impact force acts on the shielding member 4 and will not directly act on the explosion-proof valve 10. That is, the shielding member 4 can effectively reduce the impact force of the electrolyte on the explosion-proof valve 10 to avoid the situation where the explosion-proof valve 10 is damaged under the impact of the electrolyte.

[0036] Specifically, a convex portion 20 is formed at the bottom of the insulating member 2 facing the second end plate 2. The convex portion 20 is formed in a cuboid structure (it can also be formed in other polygonal, circular, elliptical, etc. structures); in addition, a hollow hole 21 in the shape of a cuboid structure is formed on the end face of the convex portion 20 facing the second end plate 2 (it can also be formed in other structures corresponding to the above-mentioned convex portion 20), that is, the convex portion 20 is actually formed in a cuboid frame structure. In addition, the hollow hole 21 penetrates through the top of the insulating member 2 facing the first end plate 1 to ensure the continuity of the cavity. More specifically, insertion holes 22 are respectively formed at both ends of the convex portion 20 in the width direction to facilitate the stable connection of the shielding member 4.

[0037] In this embodiment, as Figures 2 to 3As shown, the shielding member 4 includes a plug-in plate 40, which is formed into a rectangular plate structure. The plug-in plate 40 extends along the width direction of the convex portion 20 (i.e., the width direction of the insulating member 2), and both ends of the plug-in plate 40 in the extending direction are respectively formed into plug-in portions to be respectively plugged into the two plug-in holes 22 correspondingly. In this embodiment, the plug-in plate 40 is set to a rectangular structure, which can more effectively weaken the impact effect of the electrolyte on the explosion-proof valve 10; correspondingly, the plug-in hole 22 is formed into a rectangular hole structure.

[0038] Furthermore, a plurality of shielding plates 41 are respectively formed on both sides of the plug-in plate 40 in the extending direction. Each shielding plate 41 extends along the length direction of the insulating member 2, and the plurality of shielding plates 41 on the same side of the plug-in plate 40 are spaced apart along the extending direction of the plug-in plate 40 (i.e., the width direction of the insulating member 2). It should be noted that the size, installation position of the shielding plate 41, the size of the plug-in plate 40, etc. are not specifically limited, and should be determined comprehensively according to the size and position of the through hole 30 on the second end plate 2, as long as the projection of the shielding member 4 at the second cover plate can completely cover the through hole 30 to weaken the impact force of the electrolyte.

[0039] It should be further noted that, in order to better achieve the protective effect of the shielding member 4 on the explosion-proof valve 10 and avoid the situation that the shielding member 4 damages the explosion-proof valve 10 during the assembly process, when the shielding member 4 is plugged into the insulating member 2 correspondingly, the distance between the end face of the shielding member 4 facing the first end plate 1 and the top of the insulating member 2 facing the first end plate 1 is formed into T, and T≥0.5mm (as Figure 4 shown). In addition, the material of the shielding member 4 is not fixed. For example, it can be formed into an epoxy resin part or a metal part, etc.

[0040] Through the cell cover plate according to the present invention as described above, a shielding member 4 is plugged into the cavity of the plate body assembly. The projection of the shielding 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 shielding 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. And since the shielding member 4 is located inside the cavity, it can ensure the normal exhaust effect of the explosion-proof valve.

[0041] In addition, according to the second aspect of the present invention, a cell is provided, wherein the cell is provided with the cell cover plate as described above.

[0042] In addition, according to the third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the cell as described above.

[0043] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than limiting 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 by the present application can still modify the technical solutions described 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 of the claims.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: A plate assembly is formed with a cavity, and explosion-proof valves and a plurality of through holes are respectively provided at both ends of the cavity in a height direction; and A shielding member is formed with an inserting portion and is correspondingly inserted with the plate assembly; the shielding member is inserted in the cavity, and the projection of the shielding 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 first end plate is provided with the explosion-proof valve, and the second end plate is provided with a plurality of through holes; the shielding member is correspondingly plugged into the insulating member.

3. The cell cover plate according to claim 2, characterized in that: A convex portion is formed on the bottom of the insulating member facing the second end plate, and the convex portion is formed in a polygonal, circular or elliptical structure.

4. The cell cover plate according to claim 3, characterized in that: A hollow hole with a polygonal, circular or elliptical structure is formed on the end surface of the protrusion facing the second end plate, and the hollow hole passes through the top of the insulating member facing the first end plate.

5. The cell cover plate according to claim 4, characterized in that: Insertion holes are respectively formed at two ends of the protrusion facing each other along the width direction of the insulating member.

6. The cell cover plate according to claim 5, characterized in that: The shielding member comprises a plug-in board, and two ends of the plug-in board in an extending direction are respectively formed as the plug-in parts to be plugged into the two plug-in holes respectively.

7. The cell cover plate according to claim 6, characterized in that: Along the length direction of the insulating member, a plurality of shielding plates are respectively formed at both ends of the plug board. The shielding plates extend along the length direction of the insulating member and the plurality of shielding plates located at the same end of the plug board are spaced apart along the width of the insulating member.

8. The cell cover plate according to claim 6, characterized in that: When the shielding member is plugged into the insulating member correspondingly, the distance between the end surface of the shielding member facing the first end plate and the top of the insulating member facing the first end plate is formed to be T, and T≥0.5 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.

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