Protective structure for battery, battery pack and electric equipment

Abstract

The utility model discloses a protective structure for battery, battery pack and electric equipment, the protective structure for battery comprises: a first plate body and a second plate body, the first plate body and the second plate body are distributed at an interval, at least one of the first plate body and the second plate body is provided with a limiting part, the limiting part is used for limiting the battery cell mounted between the first plate body and the second plate body; a third plate body and a fourth plate body; wherein an accommodating space is enclosed among the first plate body, the second plate body, the third plate body and the fourth plate body, an anti-explosion valve of the battery cell can be mounted in the accommodating space, and the third plate body or the fourth plate body is used for resisting gas exhausted through the anti-explosion valve. According to the utility model, when the battery cells are subjected to thermal runaway, high-temperature gas can be discharged through the anti-explosion valve to directly impact the third plate body or the fourth plate body, so that the direct influence on adjacent battery cells is avoided, the thermal diffusion risk is obviously reduced, and the safety of the whole battery system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a protection structure for a battery, a battery pack and an electrical equipment. Background Art

[0002] The battery pack in the prior art includes a plurality of battery cells. When thermal runaway occurs in one of the battery cells, the high-pressure gas released by the explosion-proof valve of the battery cell directly acts on the adjacent battery cells, resulting in thermal diffusion and relatively low safety. In addition, for cylindrical batteries, the existing cylindrical batteries usually set the explosion-proof valve on the top surface of the cylinder cover, which has the risk of poor pressure relief and the risk of ignition due to the lack of separation between heat and electricity. Summary of the Utility Model

[0003] An object of the utility model is to provide a protection structure for a battery, which can at least solve the technical problem that the high-pressure gas released by the explosion-proof valve of the battery cell in the prior art directly acts on the adjacent battery cells, resulting in thermal diffusion.

[0004] Another object of the utility model is to provide a battery pack including the above protection structure for a battery.

[0005] A further object of the utility model is to provide an electrical equipment including the above battery pack.

[0006] In order to achieve the above objects, the utility model provides the following technical solutions.

[0007] The protection structure for a battery according to the first aspect embodiment of the utility model includes: a first plate body and a second plate body, the first plate body and the second plate body are spaced apart, and at least one of the first plate body and the second plate body has a limiting portion for limiting the battery cell installed between the first plate body and the second plate body; a third plate body and a fourth plate body, the third plate body is respectively connected to the first plate body and the second plate body, the fourth plate body is respectively connected to the first plate body and the second plate body, and the fourth plate body is spaced apart from the third plate body; wherein, a receiving space is enclosed between the first plate body, the second plate body, the third plate body and the fourth plate body, the explosion-proof valve of the battery cell can be installed in the receiving space, and the third plate body or the fourth plate body is used to resist the gas discharged through the explosion-proof valve.

[0008] Optionally, the limiting portion is a through hole provided on the first plate body or the second plate body.

[0009] Optionally, through holes are respectively provided on the first plate body and the second plate body. Along the direction from the first plate body to the second plate body, at least a part of the orthographic projection of the inner edge of the through hole of the first plate body overlaps with the orthographic projection of the inner edge of the through hole of the second plate body.

[0010] Optionally, the third plate body includes: an arc-shaped plate body having a concave surface and a convex surface, and the convex surface is disposed opposite to the explosion-proof valve of the battery cell.

[0011] Optionally, the number of the third plate bodies is multiple, and the protection structure for the battery further includes: a connecting plate that is connected to multiple third plate bodies simultaneously.

[0012] Optionally, multiple third plate bodies form multiple rows, and adjacent two third plate bodies in each row are connected through the connecting plate, and the third plate bodies in adjacent two rows are connected through the connecting plate.

[0013] Optionally, a pressure relief hole is provided on the first plate body or the second plate body, and the pressure relief hole is communicated with the accommodation space.

[0014] A battery pack according to an embodiment of the second aspect of the present invention includes: a battery cell; a protection structure, and the protection structure is the protection structure for the battery according to any one of the above.

[0015] Optionally, the battery cell is a cylindrical battery, and the explosion-proof valve of the battery cell is provided on the side surface of the cylindrical battery.

[0016] An electrical device according to an embodiment of the third aspect of the present invention includes the battery pack according to any one of the above.

[0017] According to the protection structure for the battery of the embodiment of the present invention, by using the first plate body, the second plate body, the third plate body and the fourth plate body to cooperate with each other to form an accommodation space, an accommodation space for installing the explosion-proof valve of the battery cell is formed. The gas in the battery cell can be released into the accommodation space through the explosion-proof valve, realizing thermoelectric separation and reducing the risk of ignition. When the battery cell undergoes thermal runaway, the high-temperature gas can be discharged through the explosion-proof valve, directly impacting the third plate body or the fourth plate body, avoiding the direct influence on adjacent battery cells, significantly reducing the risk of thermal diffusion, and improving the safety of the overall battery system.

[0018] Other features and advantages of the present invention will become clear through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0019] The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0020] Figure 1 is a partial cross-sectional view of a battery pack according to an embodiment of the present utility model from one perspective;

[0021] Figure 2 is a partial cross-sectional view of the battery pack according to an embodiment of the present utility model from another perspective.

[0022] Reference numerals in the drawings

[0023] Protection structure 1 for the battery;

[0024] First plate body 11;

[0025] Second plate body 12;

[0026] Limiting portion 13;

[0027] Third plate body 14; arc-shaped plate body 141; concave surface 1411; convex surface 1412;

[0028] Connecting plate 15; first connecting limb 151; second connecting limb 152; third connecting limb 153;

[0029] Pressure relief hole 16;

[0030] Electric core 2; explosion-proof valve 21. Detailed implementation manners

[0031] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps set forth in these embodiments, numerical expressions, and numerical values do not limit the scope of the present utility model.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation on the present utility model or its application or use.

[0033] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0034] In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] The following will specifically describe the protection structure 1 for a battery according to an embodiment of the present invention with reference to the accompanying drawings.

[0037] As Figure 1 and Figure 2 shown, the protection structure 1 for a battery according to an embodiment of the present invention includes: a first plate body 11, a second plate body 12, a third plate body 14, and a fourth plate body.

[0038] Specifically, the first plate body 11 and the second plate body 12 are spaced apart. At least one of the first plate body 11 and the second plate body 12 has a limiting portion 13, and the limiting portion 13 is used to limit the battery cell 2 installed between the first plate body 11 and the second plate body 12. The third plate body 14 is respectively connected to the first plate body 11 and the second plate body 12. The fourth plate body is spaced apart from the third plate body 14, and the fourth plate body is respectively connected to the first plate body 11 and the second plate body 12, and the fourth plate body is spaced apart from the third plate body 14. Among them, a receiving space is enclosed among the first plate body 11, the second plate body 12, the third plate body 14, and the fourth plate body. The explosion-proof valve 21 of the battery cell 2 can be installed in the receiving space, and the third plate body 14 or the fourth plate body is used to resist the gas discharged through the explosion-proof valve 21.

[0039] In other words, the protection structure 1 for a battery according to an embodiment of the present invention is mainly composed of a first plate body 11, a second plate body 12, a third plate body 14, and a fourth plate body. Among them, the first plate body 11 and the second plate body 12 are oppositely arranged and spaced apart. For example, the first plate body 11 is the top plate, the second plate body 12 is the bottom plate, and the first plate body 11 is directly above the second plate body 12.

[0040] At least one of the first plate body 11 and the second plate body 12 has a limiting portion 13. For example, the first plate body 11 alone is provided with the limiting portion 13, or the second plate body 12 alone is provided with the limiting portion 13, or both the first plate body 11 and the second plate body 12 are provided with the limiting portion 13. Among them, the limiting portion 13 can play a limiting role. Specifically, after at least a part of the battery cell 2 is installed between the first plate body 11 and the second plate body 12, the limiting effect on the battery cell 2 can be realized through the limiting portion 13. For example, the axial or circumferential direction of the battery cell 2 is limited through the limiting portion 13, etc. It can be understood that in this embodiment, the specific shapes and positions of the first plate body 11 and the second plate body 12 are not limited. For example, the first plate body 11 or the second plate body 12 can be a structure of a box independent of the battery pack sleeved on the outer periphery of the battery cell 2, or a part of the box of the battery pack, such as integrated with the box, or used as the inner wall of the box at the same time, etc., which is not limited here. Similarly, in this embodiment, the structure and position of the limiting portion 13 are not limited either. For example, the limiting portion 13 can be a groove provided at the end of the battery cell 2, or a through hole for the battery cell 2 to pass through, etc.

[0041] The protective structure 1 of this embodiment further includes a third plate body 14 and a fourth plate body. The third plate body 14 and the fourth plate body may be the same or different. For example, the third plate body 14 and the fourth plate body have exactly the same shape; or the third plate body 14 is independent of the box body of the battery pack, while the fourth plate body serves as the inner wall of the box body of the battery pack at the same time. When the third plate body 14 and the fourth plate body adopt the same structure, it is convenient for processing; when the third plate body 14 and the fourth plate body adopt different structures, the flexibility of the setting is improved, and it can be selected according to the environment around the battery cells.

[0042] In addition, the third plate body 14 is respectively connected to the first plate body 11 and the second plate body 12, and the fourth plate body is respectively connected to the first plate body 11 and the second plate body 12. For example, the upper end of the third plate body 14 is connected to the first plate body 11, the lower end of the third plate body 14 is connected to the second plate body 12, and the third plate body 14 is located between the first plate body 11 and the second plate body 12. The fourth plate body is simultaneously connected to the end of the first plate body 11 and the end of the second plate body 12. Another example is that the upper end of the third plate body 14 is connected to the first plate body 11, the lower end of the third plate body 14 is connected to the second plate body 12, the third plate body 14 is located between the first plate body 11 and the second plate body 12, the upper end of the fourth plate body is connected to the first plate body 11, the lower end of the fourth plate body is connected to the second plate body 12, and the fourth plate body is located between the first plate body 11 and the second plate body 12.

[0043] It should be noted that an accommodation space is enclosed between the first plate body 11, the second plate body 12, the third plate body 14 and the fourth plate body. This accommodation space may be a closed space by itself, or form a closed space in cooperation with the surrounding structures, such as cooperating with the inner wall of the box body of the battery pack to form a closed space, etc., which is not limited here. Among them, the explosion-proof valve 21 of the battery cell 2 can be installed in the accommodation space. That is to say, when the battery cell 2 and the protective structure 1 are installed together, the explosion-proof valve 21 of the battery cell 2 is located in the accommodation space, which can play a role in accommodating the gas released through the explosion-proof valve 21. After the high-temperature gas generated by thermal runaway is discharged through the explosion-proof valve 21, using the accommodation space is beneficial to form an effective gas buffer area, and the gas is dispersed in this area.

[0044] For example, under the enclosure of the first plate body 11, the second plate body 12, the third plate body 14, the fourth plate body and the inner wall of the box body of the battery pack, the accommodation space is defined as a closed space to accommodate the gas released through the explosion-proof valve 21; another example is that the accommodation space enclosed between the first plate body 11, the second plate body 12, the third plate body 14 and the fourth plate body itself is a closed space to accommodate the gas released through the explosion-proof valve 21. Another example is that the accommodation space can also be defined as a closed space through other mechanical structures, which is not limited here.

[0045] Moreover, the third plate body 14 or the fourth plate body is used to resist the gas discharged through the explosion-proof valve 21, preventing the high-temperature gas discharged by the explosion-proof valve 21 from directly acting on adjacent structures, such as adjacent battery cells 2.

[0046] Thus, for the protection structure 1 for a battery according to an embodiment of the present invention, by using the first plate body 11, the second plate body 12, the third plate body 14 and the fourth plate body to cooperate with each other to form a receiving space, a receiving space for installing the explosion-proof valve 21 of the battery cell 2 is formed. The gas in the battery cell 2 can be released into the receiving space through the explosion-proof valve 21, realizing thermoelectric separation and reducing the risk of ignition. When the battery cell 2 undergoes thermal runaway, the high-temperature gas can be discharged through the explosion-proof valve 21 and directly impact the third plate body 14 or the fourth plate body, avoiding the direct impact on the adjacent battery cell 2, significantly reducing the risk of thermal diffusion, and improving the safety of the overall battery system.

[0047] According to an embodiment of the present invention, the limiting portion 13 is a through hole provided on the first plate body 11 or the second plate body 12. For example, a plurality of through holes are provided on the first plate body 11, and the plurality of through holes on the first plate body 11 can correspond to the plurality of battery cells 2 one by one. In this embodiment, the circumferential direction of the battery cell 2 can be limited by the inner wall of the through hole. For example, the battery cell 2 extends in the up and down direction. When installing, the battery cell 2 is passed through the through hole. Optionally, the inner wall of the through hole is in close contact with the outer periphery of the battery cell 2, which is beneficial to improving the tightness of the receiving space. The shape of the through hole is the same as the outer contour shape of the battery cell 2. For example, when the battery cell 2 is a cylindrical battery, the through hole is a circular hole. When the number of through holes is multiple, the same type of battery cell 2 can be used, reducing the complexity during production and processing.

[0048] In some specific embodiments of the present invention, through holes are respectively provided on the first plate body 11 and the second plate body 12. Along the direction from the first plate body 11 to the second plate body 12, at least a part of the orthographic projection of the inner edge of the through hole on the first plate body 11 overlaps with the orthographic projection of the inner edge of the through hole on the second plate body 12. For example, the first plate body 11 and the second plate body 12 respectively extend in the horizontal direction, and through holes penetrating in the up and down direction are respectively provided on the first plate body 11 and the second plate body 12. Under the irradiation of the projection light in the up and down direction, at least a part of the orthographic projection of the inner edge of the through hole on the first plate body 11 overlaps with the orthographic projection of the inner edge of the through hole on the second plate body 12. That is to say, the positions of the through holes on the first plate body 11 and the through holes on the second plate body 12 correspond to each other, so that the battery cell 2 can be sequentially passed through the through hole on the first plate body 11 and the through hole on the second plate body 12, and thus the installation of the battery cell 2 and the limitation of multiple positions on the battery cell 2 can be realized.

[0049] Optionally, the third plate body 14 is located between the explosion-proof valves 21 of two adjacent battery cells 2, and the third plate body 14 is disposed opposite to at least one explosion-proof valve 21. For example, the two battery cells 2 are spaced apart in the left-right direction, and a third plate body 14 is disposed between the explosion-proof valve 21 of the battery cell 2 on the left and the explosion-proof valve 21 of the battery cell 2 on the right, and the left side of the third plate body 14 is opposite to the explosion-proof valve 21 of one battery cell 2, and the gas released to the right by the explosion-proof valve 21 of this battery cell 2 directly impacts the third plate body 14.

[0050] According to an embodiment of the present invention, the third plate body 14 includes an arc-shaped plate body 141, and the arc-shaped plate body 141 has a concave surface 1411 and a convex surface 1412, and the convex surface 1412 is disposed opposite to the explosion-proof valve 21 of the battery cell 2. For example, the third plate body 14 extends in the up-down direction, and the arc-shaped plate body 141 is an arc-shaped member with an opening to the right, that is, the left side surface of the arc-shaped member is the convex surface 1412, and the right side surface is the concave surface 1411. In this embodiment, on the one hand, the arc-shaped plate body 141 can correspond to the side surface of the cylindrical battery cell 2; on the other hand, it is convenient to be disposed on the circumference of the through hole through this arc-shaped plate body 141, which is convenient for the positioning and setting of the arc-shaped plate body 141; on the other hand, the convex surface 1412 is disposed opposite to the explosion-proof valve 21 of the battery cell 2. In addition, the gas discharged from the explosion-proof valve 21 directly impacts the convex surface 1412 and flows along the convex surface 1412, and the arc-shaped structure of the arc-shaped plate body 141 can be utilized, which can not only disperse the impact force, but also guide the gas flow direction.

[0051] In some specific embodiments of the present invention, the number of the third plate bodies 14 is multiple, and the protection structure 1 for the battery further includes: a connecting plate 15, and the connecting plate 15 is simultaneously connected to multiple third plate bodies 14. That is to say, the connection of multiple third plate bodies 14 can be simultaneously realized through the connecting plate 15, so that multiple third plate bodies 14 can be integrated into one body, improving the integration. In addition, by connecting the connecting plate 15 to multiple third plate bodies 14, it is also beneficial to simultaneously assemble multiple third plate bodies 14 and multiple battery cells 2.

[0052] According to an embodiment of the present invention, multiple third plate bodies 14 form multiple rows, and adjacent two third plate bodies 14 in each row are connected by a connecting plate 15, and the third plate bodies 14 in adjacent two rows are connected by a connecting plate 15. For example, multiple third plate bodies 14 form two rows, front and back, and the multiple third plate bodies 14 in each row are spaced apart in the left-right direction, and the connecting plate 15 can include a cross-shaped structure, which is convenient for connecting the third plate bodies 14 in the front and back two rows and distributed left and right together.

[0053] In this embodiment, by adopting multiple rows of the third plate body 14, convenient assembly with the battery cells 2 which are also in multiple rows can be achieved. By adopting the connecting plate 15, the assembly efficiency can be improved and an integrated structure can be realized; moreover, the structural strength can be enhanced, and the function of separating adjacent battery cells 2 can also be achieved. In addition, in this embodiment, by connecting adjacent battery cells 2 through the connecting plate 15, not only the overall structural stability of the battery pack is strengthened, but also the disordered diffusion of high-temperature gas inside the battery pack can be further restricted, which helps to maintain the structural integrity and functional reliability of the battery pack under abnormal conditions.

[0054] Optionally, the connecting plate 15 includes a first connecting limb 151, a second connecting limb 152 and a third connecting limb 153. The first connecting limb 151 is located between the front and rear rows of battery cells 2 and extends in the left-right direction. The second connecting limb 152 extends in the front-rear direction and is connected to the first connecting limb 141 and the arc-shaped plate body 141. The third connecting limb 153 is connected to the arc-shaped plate body 141. Among them, the third connecting limb 153 can be connected to the inner wall of the box body of the battery pack, or connected to another first connecting limb 152 to realize the arrangement of more rows of battery cells 2 and the like.

[0055] In some specific embodiments of the present utility model, a pressure relief hole 16 is provided on the first plate body 11 or the second plate body 12. The pressure relief hole 16 is communicated with the accommodation space. That is to say, the gas gathered in the accommodation space can flow out through the pressure relief hole 16, which can effectively improve the safety performance of the battery. In this embodiment, by providing the pressure relief hole 16, the gas in the accommodation space can be discharged in time, avoiding thermal diffusion and improving safety. Optionally, an exhaust pipe can be installed at the position where the pressure relief hole 16 is located, which is beneficial to controlling the flow direction of the discharged gas. For example, the high-temperature gas generated by thermal runaway is discharged through the explosion-proof valve 21 and then guided into the accommodation space to form an effective gas buffer area. The gas is dispersed in this area and then discharged orderly downward through the exhaust pipe, ensuring the smoothness of the pressure relief process and preventing secondary accidents caused by pressure accumulation.

[0056] Optionally, the first plate body 11, the second plate body 12 and the third plate body 14 are integrally formed parts, which improves the convenience of installation and disassembly.

[0057] Optionally, at least one of the first plate body 11, the second plate body 12, the third plate body 14, the fourth plate body and the connecting plate 15 is a heat-insulating part, which can effectively prevent heat transfer, avoid thermal diffusion and further improve safety.

[0058] The working process of the protection structure 2 of the embodiment of the present utility model will be described in detail below in conjunction with specific embodiments.

[0059] During operation, when thermal runaway occurs in the battery cell 2, the explosion-proof valve 21 bursts open, and then the high-temperature gas is discharged through the explosion-proof valve 21. The discharged high-temperature gas first impacts the heat-insulating arc-shaped plate body 141 on the opposite side. The heat-insulating arc-shaped plate body 141 can insulate the adjacent battery cell 2. Then the high-temperature gas flows into the accommodation space and is then discharged downward through the exhaust pipe, thereby releasing pressure.

[0060] The present utility model also provides a battery pack, which includes: a battery cell 2 and a protection structure. The protection structure is the protection structure 1 for a battery according to any one of the above embodiments. Since the protection structure for a battery in the above embodiments has the advantage of high safety performance, the battery pack in the embodiments of the present utility model also has the same advantages. For example, it solves at least one of the problems such as the separation of heat and electricity, poor pressure relief, and high risk of thermal diffusion in the traditional design, realizes efficient thermal runaway protection and pressure relief functions, improves the installation convenience and the stability of the battery pack, and provides a strong guarantee for the safe operation of the battery system, etc., which will not be elaborated here.

[0061] According to an embodiment of the present utility model, the battery cell 2 is a cylindrical battery, and the explosion-proof valve 21 of the battery cell 2 is provided on the side surface of the cylindrical battery. For example, the battery cell 2 is a cylindrical battery, and the explosion-proof valve 21 is provided on the side surface of the cylindrical battery. In this embodiment, by avoiding setting the explosion-proof valve 21 on the axial top cover surface of the cylindrical battery, the risk of poor pressure relief is reduced. Also, since the third plate body 14 or the fourth plate body is used to resist the gas discharged through the explosion-proof valve 21, when the explosion-proof valve 21 is provided on the side surface of the cylindrical battery, the high-temperature mixed gas during pressure relief can directly act on the third plate body 14 or the fourth plate body, rather than directly acting on the adjacent battery cell 2. In addition, since a accommodation space is enclosed between the first plate body 11, the second plate body 12, the third plate body 14 and the fourth plate body, and the explosion-proof valve 21 of the battery cell 2 can be installed in the accommodation space, even if the explosion-proof valve 21 of the battery cell 2 is provided on the side surface of the cylindrical battery, through the mutual cooperation of the first plate body 11, the second plate body 12, the third plate body 14 and the fourth plate body, it is also beneficial to realize the separation of heat and electricity and avoid the risk of ignition.

[0062] The present utility model also provides an electrical device, which includes the battery pack according to any one of the above embodiments and also has advantages such as high safety performance, etc., which will not be elaborated here.

[0063] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A protective structure (1) for a battery, characterized in that Comprising: A first plate body (11) and a second plate body (12), the first plate body (11) and the second plate body (12) are spaced apart, and at least one of the first plate body (11) and the second plate body (12) is provided with a limiting portion (13), and the limiting portion (13) is used for limiting the battery cell (2) installed between the first plate body (11) and the second plate body (12); A third plate body (14) and a fourth plate body, the third plate body (14) is respectively connected to the first plate body (11) and the second plate body (12), the fourth plate body is respectively connected to the first plate body (11) and the second plate body (12), and the fourth plate body is spaced apart from the third plate body (14); Wherein, a receiving space is enclosed among the first plate body (11), the second plate body (12), the third plate body (14) and the fourth plate body, and an explosion-proof valve (21) of the battery cell (2) can be installed in the receiving space, and the third plate body (14) or the fourth plate body is used for resisting the gas discharged through the explosion-proof valve (21).

2. The protective structure (1) for a battery according to claim 1, characterized in that, The limiting portion (13) is a through hole provided in the first plate body (11) or the second plate body (12).

3. The protective structure (1) for a battery according to claim 2, characterized in that, Through holes are respectively provided on the first plate body (11) and the second plate body (12), and along the direction from the first plate body (11) to the second plate body (12), at least a part of the orthographic projection of the inner edge of the through hole of the first plate body (11) overlaps with the orthographic projection of the inner edge of the through hole of the second plate body (12).

4. The protective structure (1) for a battery according to claim 1, wherein, The third plate body (14) comprises: An arc-shaped plate body (141), the arc-shaped plate body (141) has a concave surface (1411) and a convex surface (1412), and the convex surface (1412) is arranged opposite to the explosion-proof valve (21) of the battery cell (2).

5. The protective structure (1) for a battery according to claim 1 or 4, characterized in that, The number of the third plate bodies (14) is multiple, and the protection structure (1) for the battery further comprises: A connecting plate (15), the connecting plate (15) is simultaneously connected to multiple third plate bodies (14).

6. The protective structure (1) for a battery according to claim 5, characterized in that, The multiple third plate bodies (14) form multiple rows, and adjacent two of the third plate bodies (14) in each row are connected by the connecting plate (15), and the third plate bodies (14) in adjacent two rows are connected by the connecting plate (15).

7. The protective structure (1) for a battery according to claim 1, characterized in that, A pressure relief hole (16) is provided on the first plate body (11) or the second plate body (12), and the pressure relief hole (16) is communicated with the receiving space.

8. A battery pack, characterized in that, Comprising: A battery cell (2); A protection structure, and the protection structure is the protection structure (1) for the battery according to any one of claims 1-7.

9. The battery pack according to claim 8, wherein, The battery cell (2) is a cylindrical battery, and the explosion-proof valve (21) of the battery cell (2) is arranged on the side surface of the cylindrical battery.

10. An electrical device, characterized in that, Including the battery pack according to claim 8 or 9.

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