Battery upper cover, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a battery upper cover, a battery pack and a vehicle, the inner wall of the battery upper cover comprises a first wall part, the first wall part is used for defining an electrical bin, the inner wall of the battery upper cover is provided with a concave part opposite to a first anti-explosion valve of a battery cell, and part of the concave part is located on the first wall part. According to the battery upper cover, the characteristic that the internal density of the electrical bin is lower than that of the energy bin is utilized, safe pressure relief is achieved through the arrangement of the concave parts, meanwhile, additional thermal runaway exhaust space does not need to be added, and the energy density of the battery pack is improved while the pressure relief safety requirement is met.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cover, a battery pack, and a vehicle. Background Technology

[0002] When the battery cover is used in a battery pack, a space for thermal runaway venting needs to be reserved between the battery cover and the explosion-proof valve of the cell, resulting in low energy density of the battery pack. Utility Model Content

[0003] The purpose of this application is to provide a battery cover, a battery pack, and a vehicle that meet the requirements for pressure relief safety while increasing the energy density of the battery pack.

[0004] To solve the above-mentioned technical problems, this application provides a battery cover, the inner wall of which includes a first wall portion for forming an electrical compartment, and the inner wall of the battery cover is provided with a recessed portion for opposing the first explosion-proof valve of the battery cell, a portion of which is located in the first wall portion.

[0005] The inner wall of the battery cover in this application is provided with a recessed portion opposite to the first explosion-proof valve of the battery cell. Part of the recessed portion is located in the first wall portion, which is used to enclose the electrical compartment, that is, the first wall portion forms the wall of the electrical compartment. When the battery cell experiences thermal runaway, the first explosion-proof valve of the battery cell is activated, and high-temperature gas and pressure can be rapidly depressurized to the electrical compartment area through the recessed portion. Since the electrical compartment usually contains electrical components, the density of electrical components inside the electrical compartment is lower than the density of battery cells inside the energy compartment. Utilizing the low density characteristic inside the electrical compartment, high-temperature gas and pressure can be more easily released to the external environment, thereby reducing the pressure inside the battery pack, preventing structural damage or explosion, and meeting the pressure relief safety requirements. Since the pressure relief channel is integrated into the battery cover, when the battery cover of this embodiment is applied to the battery pack, there is no need to add an additional thermal runaway venting space, achieving effective pressure management without sacrificing the energy density of the battery pack.

[0006] In summary, the battery cover of this application utilizes the low density of the electrical compartment and achieves safe pressure relief through the setting of the recessed part, thereby improving the energy density of the battery pack while meeting the pressure relief safety requirements.

[0007] Optionally, the inner wall of the battery cover further includes a second wall portion for forming an energy chamber, the first wall portion being located at the end of the second wall portion in a first direction, at least a portion of the recess extending along the first direction, and the second wall portion being located within the extension range of the recess.

[0008] Optionally, the recess includes a plurality of first recesses extending along the first direction, the plurality of first recesses being distributed along the second direction, and the second wall portion being located within the extension range of the first recesses;

[0009] The recessed portion further includes a second recessed portion, which is located in the first wall portion and connects to the corresponding ends of each of the first recessed portions. The first direction and the second direction are perpendicular to each other.

[0010] Optionally, the recess includes a first recess extending along the first direction, the second wall portion being located within the extension range of the first recess, and a portion of the first recess extending to the first wall portion.

[0011] Optionally, the number of the first wall portions is at least one, and a portion of the recess is located in at least one of the first wall portions.

[0012] Optionally, the battery cover has an outwardly protruding portion, the interior of which forms a receiving groove for partially accommodating the battery cell, the bottom wall of which includes the first wall portion.

[0013] Optionally, the battery cover includes:

[0014] The inner cover plate has an inner wall that is the inner wall of the battery cover, and the recessed portion is formed by the inner wall of the inner cover plate arching outward.

[0015] An outer cover plate is connected to the outer end of the inner cover plate, and a cavity is formed between the inner cover plate and the outer cover plate;

[0016] A buffer layer fills the interior of the cavity.

[0017] Optionally, both the inner cover plate and the outer cover plate are integrally formed structures;

[0018] And / or, both the inner cover plate and the outer cover plate are thermoformed aluminum parts.

[0019] This application provides a battery pack, including:

[0020] The aforementioned battery cover;

[0021] The battery cell includes a first explosion-proof valve, which is opposite to a recess in the battery cover.

[0022] The battery pack of this application includes the aforementioned battery cover, and therefore has the same technical effect as the aforementioned battery cover, which will not be repeated here.

[0023] Optionally, the battery pack further includes:

[0024] The battery housing includes a receiving cavity with one end open, the battery cell is at least partially connected to the receiving cavity, the battery cover is connected to the open end of the battery housing, and a second explosion-proof valve is provided in the wall of the battery housing that forms the electrical compartment.

[0025] This application provides a vehicle that includes the aforementioned battery cover; or, includes the aforementioned battery pack.

[0026] The vehicle described in this application includes the aforementioned battery cover or the aforementioned battery pack, and therefore has the same technical effect as the aforementioned battery cover or battery pack, which will not be repeated here. Attached Figure Description

[0027] Figure 1 A schematic diagram of a specific embodiment of the battery cover provided in this application;

[0028] Figure 2 for Figure 1 A schematic diagram of the battery cover and battery cell in the assembled state;

[0029] Figure 3 for Figure 1 A simplified structural diagram of the battery cover and battery cell in the assembled state;

[0030] Figure 4 for Figure 1 A breakdown diagram of the battery cover;

[0031] Figure 5 for Figure 1 A cross-sectional view of the battery cover along the AA direction;

[0032] Figure 6 for Figure 4 Schematic diagram of the structure of the inner and outer cover plates;

[0033] Figure 7 This is a schematic diagram of the structure of a specific embodiment of the battery pack provided in this application;

[0034] in, Figures 1-7 The accompanying figure labels are as follows:

[0035] 1-Battery top cover; 1A-First wall portion; 1B-Second wall portion; 1a-Recessed portion; 1a1-First recessed portion; 1a2-Second recessed portion; 1b-Receiving groove; 11-Inner cover plate; 12-Outer cover plate; 111-Bottom plate; 112-Side plate; 113-Flanged edge; 13-Buffer layer; a-Cavity;

[0036] 2-Battery cell; 21-First explosion-proof valve;

[0037] 3-Battery housing. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The battery pack is a key component of new energy vehicles. Its internal structure, depending on its function, can be divided into multiple compartments. The electrical compartment and the energy compartment are two important types of compartments. Specifically:

[0040] The energy compartment typically refers to the part of a battery pack that stores the battery cells. A battery cell is the smallest battery unit in a battery pack, and they are connected in series and parallel to form a battery module, which in turn constitutes the entire battery pack. The main function of the energy compartment is to store and release electrical energy to power the vehicle. Because the energy compartment focuses on energy storage, it is designed to be more compact to reduce wasted space.

[0041] The electrical compartment refers to the part of the battery pack that houses electrical components, including but not limited to the battery management system, voltage distributor, current sensor, fuse, and contactor. Because the electrical compartment needs to consider factors such as heat dissipation, ease of maintenance, and safety, the density of electrical components inside is lower than the density of battery cells inside the energy compartment.

[0042] Please refer to Figures 1-3 , Figure 1 A schematic diagram of a specific embodiment of the battery cover provided in this application; Figure 2 for Figure 1 A schematic diagram of the battery cover and battery cell in the assembled state; Figure 3 for Figure 1 A simplified structural diagram of the battery cover and battery cell in the assembled state.

[0043] This embodiment provides a battery cover 1. The inner wall of the battery cover 1 includes a first wall portion 1A, which is used to form an electrical compartment. The inner wall of the battery cover 1 is provided with a recess 1a that is opposite to the first explosion-proof valve 21 of the battery cell 2. Part of the recess 1a is located in the first wall portion 1A.

[0044] It should be noted that when the battery cover 1 is applied to the battery pack, the direction facing the cell 2 is "inside", and the direction away from the cell 2 is "outside".

[0045] In this embodiment, the inner wall of the battery cover 1 is provided with a recess 1a that is opposite to the first explosion-proof valve 21 of the battery cell 2. Part of the recess 1a is located in the first wall 1A, which is used to enclose the electrical compartment. That is, the first wall 1A forms the wall of the electrical compartment. When the battery cell 2 experiences thermal runaway, the first explosion-proof valve 21 of the battery cell 2 is activated. High-temperature gas and pressure can be quickly released to the electrical compartment area through the recess 1a. Since the electrical compartment usually contains electrical components, the density of electrical components inside the electrical compartment is lower than the density of battery cells inside the energy compartment. By utilizing the low density inside the electrical compartment, high-temperature gas and pressure can be more easily released to the external environment, thereby reducing the pressure inside the battery pack, preventing structural damage or explosion, and meeting the pressure relief safety requirements. Since the pressure relief channel is integrated into the battery cover 1, when the battery cover 1 of this embodiment is applied to the battery pack, there is no need to add an additional thermal runaway venting space, achieving effective pressure management without sacrificing the energy density of the battery pack.

[0046] In summary, the battery cover 1 in this embodiment utilizes the low density of the electrical compartment and achieves safe pressure relief through the recessed portion 1a, thereby improving the energy density of the battery pack while meeting the pressure relief safety requirements.

[0047] Please continue to refer to this. Figures 1-3 In some embodiments of this application, the inner wall of the battery cover 1 further includes a second wall portion 1B, which is used to form an energy chamber, that is, the second wall portion 1B forms the wall portion of the energy chamber. The first wall portion 1A is located at the end of the second wall portion 1B in a first direction, and at least part of the recess 1a extends along the first direction. The second wall portion 1B is located within the extension range of the recess 1a.

[0048] It should be noted that the battery cell group includes multiple battery cells 2, which are arranged in a direction perpendicular to its large surface. The arrangement direction of multiple battery cells 2 in the same battery cell group is the first direction.

[0049] exist Figure 1 In the middle, the wall portion located between the two dashed lines is the second wall portion 1B, and the wall portion located outside the two dashed lines is the first wall portion 1A.

[0050] The second wall portion 1B is located within the extension range of the recessed portion 1a. In other words, the length of the recessed portion 1a along the first direction is not less than the length of the second wall portion 1B along the first direction.

[0051] As configured above, the second wall portion 1B is used to enclose the energy compartment, that is, the part of the battery pack used to store the battery cells 2. At least part of the recessed portion 1a extends along the first direction, and the second wall portion 1B is located within the extension range of the recessed portion 1a, ensuring that the first explosion-proof valve 21 of each battery cell 2 is located within the extension range of the recessed portion 1a. When any battery cell 2 experiences thermal runaway, high-temperature gas and pressure can be quickly released to the energy compartment area through the recessed portion 1a, thereby reducing the pressure inside the battery pack and meeting the pressure relief safety requirements.

[0052] Please continue to refer to this. Figures 1-3 In some embodiments of this application, the recess 1a includes a plurality of first recesses 1a1 extending along a first direction, the plurality of first recesses 1a1 being distributed along a second direction, and the second wall portion 1B being located within the extension range of the first recesses 1a1.

[0053] The recessed portion 1a also includes a second recessed portion 1a2, which is located in the first wall portion 1A and connects to the corresponding ends of each of the first recessed portions 1a1. The first direction and the second direction are perpendicular to each other.

[0054] As configured above, the recess 1a includes multiple first recesses 1a1 extending along a first direction. The multiple first recesses 1a1 are distributed along a second direction. The number of first recesses 1a1 is consistent with the number of cell groups in the battery pack. The first explosion-proof valve 21 of each cell 2 in each cell group is opposite to a first recess 1a1. When any cell 2 experiences thermal runaway, high-temperature gas and pressure can be quickly released to the electrical compartment area through the corresponding first recess 1a1. The second recess 1a2 connects each first recess 1a1, forming an effective exhaust channel. Even if multiple cells 2 experience thermal runaway at the same time, heat and gas can be quickly and effectively discharged, improving the safety of the battery pack.

[0055] In some other embodiments of this application, the recess 1a includes a first recess 1a1 extending along a first direction, a second wall portion 1B located within the extension range of the first recess 1a1, and a portion of the first recess 1a1 extending to the first wall portion 1A.

[0056] As set up above, each first recess 1a1 serves as an independent pressure relief channel, which can individually perform pressure relief operation on the first explosion-proof valve 21 of the corresponding battery cell 2. This independent setting ensures that when a single battery cell 2 or a portion of battery cells 2 experiences thermal runaway, heat and gas can be quickly and effectively discharged without affecting the normal operation of other battery cells 2, reducing the propagation of pressure inside the battery pack, and lowering the overall risk of explosion.

[0057] Depend on Figure 1 and Figure 2As can be seen, in this embodiment, there are two first wall portions 1A, and the two first wall portions 1A are located at both ends of the second wall portion 1B in the first direction, and the partial recessed portion 1a is located at the two second wall portions 1B.

[0058] As configured above, the two first wall portions 1A are located at both ends of the second wall portion 1B in the first direction, and the partial recessed portions 1a are located at the two second wall portions 1B. The recessed portions 1a can simultaneously play a pressure relief role at both ends of the battery pack, so that heat and gas can be discharged as quickly as possible when thermal runaway occurs at either end of the battery pack, thereby improving the pressure relief efficiency. At the same time, the symmetrical design of pressure relief at both ends helps to balance the internal pressure of the battery pack, reduce structural deformation or damage caused by uneven pressure, and improve the safety of the battery pack.

[0059] In some other embodiments of this application, there are two first wall portions 1A, located at opposite ends of the second wall portion 1B in a first direction, with a partial recess 1a located at one end of the second wall portion 1B. This single-end pressure relief design allows for more precise control of the pressure relief direction and force, reducing the impact on other parts of the battery pack and improving overall safety; it also simplifies the structure of the battery cover 1.

[0060] In some other embodiments of this application, there is only one first wall portion 1A, which is located at one end of the second wall portion 1B in a first direction, and a partial recess 1a is located in the second wall portion 1B. As described above, with only one first wall portion 1A, more battery cells 2 or related electrical components can be added at the other end, improving the space utilization and energy density of the battery pack; the single-end pressure relief design allows for more precise control of the pressure relief direction and force, reducing the impact on other parts of the battery pack and improving overall safety; simultaneously, it simplifies the structure of the battery cover 1.

[0061] In summary, the battery cover 1 includes at least one first wall portion 1A, and a partial recess 1a is located in at least one first wall portion 1A.

[0062] Please continue to refer to this. Figure 3 In some embodiments of this application, the battery cover 1 has an outwardly protruding portion, and the interior of the protruding portion forms a receiving groove 1b for partially accommodating the battery cell 2. The bottom wall of the receiving groove 1b includes a first wall portion 1A and a second wall portion 1B, and a recessed portion 1a is formed on the bottom wall of the receiving groove 1b.

[0063] When the battery cover 1 is applied to the battery pack, the battery cover 1 is connected to the opening end of the battery box, and the battery cell 2 is connected to the inside of the battery box. The battery box plays the main load-bearing role. Since the battery box per unit volume is heavier than the battery cover per unit volume, if all the battery cells 2 are located inside the battery box, the side height of the battery box will be high, which is not conducive to the lightweighting of the battery pack. However, in some embodiments of this application, the battery cover 1 has an outwardly protruding part, and the inside of the protruding part forms a receiving groove 1b for partially accommodating the battery cell 2. In this way, the side height of the battery box can be reduced and compensated by the battery cover 1, which is more conducive to the lightweighting of the battery pack.

[0064] Please refer to Figures 4-6 , Figure 4 for Figure 1 A breakdown diagram of the battery cover; Figure 5 for Figure 1 A cross-sectional view of the battery cover along the AA direction; Figure 6 for Figure 4 Schematic diagram of the structure of the inner and outer cover plates.

[0065] In some embodiments of this application, the battery cover 1 includes:

[0066] The inner cover plate 11 has an inner wall that is the inner wall of the battery cover 1, and the recessed portion 1a is formed by the inner wall of the inner cover plate 11 arching outward.

[0067] The outer cover plate 12 is connected to the outer end of the inner cover plate 11, and the inner cover plate 11 and the outer cover plate 12 form a cavity a;

[0068] Buffer layer 13 fills the interior of cavity a.

[0069] In related technologies, battery covers formed by welding aluminum profiles are usually solid structures and are relatively heavy. However, in this embodiment, the battery cover 1 adopts a sandwich structure. By using a thinner inner cover plate 11 and an outer cover plate 12, and filling a buffer layer 13 between the inner cover plate 11 and the outer cover plate 12, the amount of material used in the battery cover 1 is greatly reduced, and the weight of the battery cover 1 is significantly reduced. By filling with a lightweight buffer layer 13, a cushioning effect can be achieved, protecting the internal battery cells 2 from damage when subjected to external impacts. It also helps to maintain the rigidity and strength of the battery cover 1, ensuring the structural stability of the battery cover 1.

[0070] In some embodiments of this application, the buffer layer 13 includes expanded polystyrene foam. The expanded polystyrene foam material has a porous structure, which can effectively absorb and disperse impact forces, protecting the internal battery cell 2 from damage when subjected to external impacts. The expanded polystyrene foam has a low density, and when filled between the inner cover plate 11 and the outer cover plate 12, it can further reduce the overall weight of the battery cover 1, meeting the requirements for lightweighting. The expanded polystyrene foam has good thermal insulation properties, which can reduce the outward transfer of heat generated during operation, providing a heat preservation effect, helping to maintain the operating temperature of the battery pack and improve its service life.

[0071] Of course, the buffer layer 13 can also be made of other materials with low thermal conductivity, such as polyurethane foam, polyethylene foam, etc.

[0072] Please continue to refer to this. Figure 5 In some embodiments of this application, both the inner cover plate 11 and the outer cover plate 12 include a bottom plate 111, a side plate 112 and a flange 113. The side plate 112 surrounds the bottom plate 111, and the flange 113 surrounds the inner end of the side plate 112.

[0073] Two side plates 112 are fitted together, two flanges 113 are fitted together, and a cavity a is formed between two bottom plates 111. The side plates 112 and bottom plates 111 of the inner cover plate 11 enclose and form a receiving groove 1b for partially accommodating the battery cell 2. A recess 1a is formed on the bottom plate 111 of the inner cover plate 11.

[0074] As described above, the bottom plate 111 and side plate 112 of the outer cover 12 form a first groove. During the assembly of the battery cover 1, the buffer material can be placed into the first groove first, and then the inner cover 11 and the outer cover 12 can be connected. A closed cavity a is formed between the inner cover 11 and the outer cover 12. Under the squeezing action of the inner cover 11 and the outer cover 12, the buffer material flows according to the shape of the cavity a, so that the cavity a can be completely filled by the buffer material. After the buffer material is cured, a buffer layer 13 is formed. The buffer layer 13 can achieve a tight connection between the inner cover 11 and the outer cover 12. The setting of the flange 113 in the inner cover 11 and the outer cover 12 makes the connection between the inner cover 11 and the outer cover 12 more convenient and increases the contact area between the inner cover 11 and the outer cover 12. The buffer material is less likely to overflow under the squeezing action of the inner cover 11 and the outer cover 12.

[0075] As can be seen from the above description, during the assembly process of the battery cover 1, the structural form of the inner cover plate 11 and the outer cover plate 12 in this embodiment is more conducive to the addition of buffer material and the formation of the buffer layer 13, which improves the assembly convenience and the connection reliability of the inner cover plate 11 and the outer cover plate 12. After molding, the side plate 112 and the bottom plate 111 of the inner cover plate 11 form a receiving groove 1b for partially accommodating the battery cell 2, which makes the side height of the battery box lower and is more conducive to the lightweighting of the battery pack.

[0076] Both the inner cover plate 11 and the outer cover plate 12 are integrally formed structures.

[0077] As described above, both the inner cover 11 and the outer cover 12 are integrally formed structures. Due to the influence of the processing technology, the thickness of the inner cover 11 and the outer cover 12 can be reduced, making the inner cover 11 and the outer cover 12 lighter than the battery cover formed by welding aluminum profiles in related technologies. This can meet the lightweight requirements of some vehicle models for battery packs. In addition, the integrally formed inner cover 11 and the outer cover 12 have better sealing performance and fewer airtightness testing steps compared to the battery cover formed by welding aluminum profiles in related technologies. Therefore, the production process is simpler, and the airtightness yield is higher.

[0078] This application does not limit the materials of the inner cover 11 and the outer cover 12; for example, they can be metal or composite materials. Exemplarily, the inner cover 11 and the outer cover 12 can be formed using an aluminothermic forming process, meaning the inner cover 11 and the outer cover 12 are aluminothermic formed parts. This increases the depth of the inner cover 11 and the outer cover 12, which, when applied to a battery pack, can reduce the height of the battery casing, achieving cost reduction and weight reduction.

[0079] In some other embodiments of this application, the battery cover 1 may also be integrally stamped from a steel plate or integrally molded from a composite material.

[0080] Please refer to Figure 7 , Figure 7 This is a schematic diagram of a specific embodiment of the battery pack provided in this application.

[0081] This embodiment also provides a battery pack, including:

[0082] The aforementioned battery cover 1;

[0083] The battery cell 2 includes a first explosion-proof valve 21, which is opposite to the recess 1a of the battery cover 1.

[0084] The battery pack of this application includes the aforementioned battery cover 1, and therefore has the same technical effect as the aforementioned battery cover 1, which will not be repeated here.

[0085] Furthermore, in some embodiments of this application, the battery pack further includes:

[0086] The battery housing 3 includes a receiving cavity with one end open, the battery cell 2 is at least partially connected to the receiving cavity, the battery cover 1 is connected to the open end of the battery housing 3, and a second explosion-proof valve is provided in the wall of the battery housing 3 that forms the electrical compartment.

[0087] As described above, a second explosion-proof valve is provided in the wall of the battery box 3 that forms the electrical compartment. When high-temperature gas and pressure flow through the recess 1a to the electrical compartment area, the second explosion-proof valve can respond quickly and reduce the risk of battery pack explosion by releasing pressure, thereby improving the safety performance of the battery pack.

[0088] This embodiment also provides a vehicle including the aforementioned battery cover 1; or, including the aforementioned battery pack.

[0089] The vehicle in this embodiment includes the aforementioned battery cover 1; or, includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery cover 1 or battery pack, which will not be described again here.

[0090] When the battery pack is used in a vehicle, it can be installed normally or upside down. When the battery pack is installed upside down, the battery cover 1 serves as a bottom protection plate for the upside-down battery pack. In the event of a scrape, the battery cover 1 can be easily replaced without replacing the entire battery pack, thus reducing costs.

[0091] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery cover, characterized in that, The inner wall of the battery cover (1) includes a first wall portion (1A), which is used to form an electrical compartment. The inner wall of the battery cover (1) is provided with a recess (1a) opposite to the first explosion-proof valve (21) of the battery cell (2), and part of the recess (1a) is located in the first wall portion (1A).

2. The battery cover according to claim 1, characterized in that, The inner wall of the battery cover (1) further includes a second wall portion (1B) for forming an energy chamber. The first wall portion (1A) is located at the end of the second wall portion (1B) in a first direction. At least part of the recess (1a) extends along the first direction, and the second wall portion (1B) is located within the extension range of the recess (1a).

3. The battery cover according to claim 2, characterized in that, The recess (1a) includes a plurality of first recesses (1a1) extending along the first direction, the plurality of first recesses (1a1) being distributed along the second direction, and the second wall portion (1B) being located within the extension range of the first recesses (1a1). The recessed portion (1a) further includes a second recessed portion (1a2), which is located in the first wall portion (1A) and connects to the corresponding ends of each of the first recessed portions (1a1), wherein the first direction and the second direction are perpendicular to each other.

4. The battery cover according to claim 2, characterized in that, The recess (1a) includes a first recess (1a1) extending along the first direction, the second wall portion (1B) being located within the extension range of the first recess (1a1), and a portion of the first recess (1a1) extending to the first wall portion (1A).

5. The battery cover according to any one of claims 1-4, characterized in that, The number of the first wall portion (1A) is at least one, and a portion of the recess (1a) is located in at least one of the first wall portions (1A).

6. The battery cover according to any one of claims 1-4, characterized in that, The battery cover (1) has an outwardly protruding portion, and the interior of the protruding portion forms a receiving groove (1b) for partially accommodating the battery cell (2), the bottom wall of the receiving groove (1b) including the first wall portion (1A).

7. The battery cover according to any one of claims 1-4, characterized in that, The battery cover (1) includes: The inner cover plate (11) has an inner wall that is the inner wall of the battery cover (1), and the recess (1a) is formed by the inner wall of the inner cover plate (11) arching outward. An outer cover plate (12) is connected to the outer end of the inner cover plate (11), and a cavity (a) is formed between the inner cover plate (11) and the outer cover plate (12). A buffer layer (13) fills the interior of the cavity (a).

8. The battery cover according to claim 7, characterized in that, The inner cover plate (11) and the outer cover plate (12) are both integrally formed structures; And / or, both the inner cover plate (11) and the outer cover plate (12) are thermoformed aluminum parts.

9. A battery pack, characterized in that, include: Battery cover (1) as described in any one of claims 1-8; The battery cell (2) includes a first explosion-proof valve (21) which is opposite to the recess (1a) of the battery cover (1).

10. The battery pack according to claim 9, characterized in that, The battery pack also includes: The battery housing (3) includes a receiving cavity with one end open, the battery cell (2) is at least partially connected to the receiving cavity, the battery cover (1) is connected to the opening end of the battery housing (3), and a second explosion-proof valve is provided in the wall of the battery housing (3) that forms the electrical compartment.

11. A vehicle, characterized in that, It includes the battery cover (1) as described in any one of claims 1-8; or, it includes the battery pack as described in any one of claims 9-10.

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