Battery box and battery pack

Abstract

The utility model provides a kind of battery box and battery pack, the battery box includes box and fender plate. Among them, the inside of the box has cavity;The fender plate is set on the side wall of the cavity, and the fender plate includes foamed metal layer, and the foamed metal layer surface and / or inside have multiple micropores.The battery box and battery pack of the utility model improve the technical problem that the end beam of battery pack is prone to deformation.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery box and battery pack. Background Technology

[0002] In related technologies, new energy batteries are increasingly leaning towards CTP (Cellto Pack, module-free technology) and CTB (Cellto Body, cell-body integration technology) assembly technologies. Because these assembly technologies eliminate traditional end plates, side plates, and steel strips that constrain cell expansion, the expansion force of the cell acts entirely on the end beam of the battery pack, resulting in increased deformation of the end beam. To solve this problem, related technologies generally increase the number of reinforcing ribs in the aluminum extrusion beam or use steel rolling processes to manufacture the expansion beam. However, these solutions still cannot effectively solve the problem of easy deformation of the end beam. Utility Model Content

[0003] The present invention provides a battery box and battery pack, which can improve the technical problem that the end crossbeam of the battery pack is prone to deformation.

[0004] In a first aspect, embodiments of the present invention provide a battery box, comprising:

[0005] A housing, the interior of which has a cavity;

[0006] A protective plate is disposed on the side wall of the cavity, and the protective plate includes a foamed metal layer, the surface and / or interior of which have multiple micropores; this configuration can improve the deformation resistance of the protective plate, reduce the weight of the battery pack, and improve the battery pack's range.

[0007] In some embodiments, the housing includes a main body and a cover plate. The cavity is provided inside the main body, and the cover plate covers the top of the main body. Along the circumferential direction of the cavity, the protective plate is disposed on the circumferential sidewall of the cavity. This arrangement allows the protective plate to resist the expansion force from the thermal runaway expansion of the battery cell from all directions, making the structure of the battery pack more reliable.

[0008] In some embodiments, a predetermined gap is provided between the protective plate and the circumferential sidewall; this arrangement allows the predetermined gap to provide a certain buffer space for the protective plate, preventing deformation of the housing, and also optimizing the internal layout of the battery pack.

[0009] In some embodiments, protective plates are provided on opposite sides of the cavity along the circumferential direction of the cavity; this arrangement enables the protective plates to provide bidirectional fixation for the battery cell, preventing displacement due to thermal runaway expansion of the battery cell and ensuring the structural stability of the battery pack.

[0010] In some embodiments, the protective plate further includes a first protective layer disposed on a first side of the foamed metal layer near the circumferential sidewall, along the inward and outward direction of the cavity; and / or,

[0011] The protective plate also includes a second protective layer. Along the inner and outer direction of the cavity, the second protective layer is disposed on the second side of the foamed metal layer opposite to the first side. This arrangement allows the first protective layer to seal the micropores to prevent solid impurities from entering the interior of the foamed metal layer, thereby enhancing the strength of the protective plate. The second protective layer, on the other hand, protects the battery cell from scratches, thus improving the safety of the battery pack.

[0012] In some embodiments, the protective panel further includes a first adhesive layer bonded between the foamed metal layer and the first protective layer; and / or,

[0013] The protective panel further includes a second adhesive layer, which is bonded between the foamed metal layer and the second protective layer. This arrangement ensures that the first adhesive layer can tightly bond the first protective layer and the foamed metal layer, and the second adhesive layer can tightly bond the second protective layer and the foamed metal layer, effectively preventing relative movement of the first protective layer, the second protective layer, and the foamed metal layer, thus ensuring the protective function of the protective panel.

[0014] In some embodiments, the thickness D of the foamed metal layer and the thickness L1 of the first protective layer satisfy the relationship: 0.05 ≤ D / L1 ≤ 3000; and / or,

[0015] The thickness D of the foamed metal layer and the thickness S1 of the first adhesive layer satisfy the following relationship: 0.05 ≤ D / S1 ≤ 3000; and / or,

[0016] The thickness L1 of the first protective layer and the thickness S1 of the first adhesive layer satisfy the following relationship: 0.005 ≤ L1 / S1 ≤ 200; and / or,

[0017] The thickness D of the foamed metal layer and the thickness L2 of the second protective layer satisfy the following relationship: 0.05 ≤ D / L2 ≤ 3000; and / or,

[0018] The thickness D of the foamed metal layer and the thickness S2 of the second adhesive layer satisfy the following relationship: 0.05 ≤ D / S2 ≤ 3000; and / or,

[0019] The thickness L2 of the second protective layer and the thickness S2 of the second adhesive layer satisfy the relationship: 0.005≤L2 / S2≤200. This setting ensures that the foamed metal layer, the first protective layer, the second protective layer, the first adhesive layer, and the second adhesive layer have a reasonable thickness ratio, ensuring that the foamed metal layer, the first protective layer, the second protective layer, the first adhesive layer, and the second adhesive layer can work together to improve the buffering capacity of the protective plate, the connection capacity between the internal components of the protective plate, and the protective capacity.

[0020] In some embodiments, the thickness D of the foamed metal layer satisfies the following relationship: 1mm ≤ D ≤ 300mm; and / or,

[0021] The thickness L1 of the first protective layer satisfies the following relationship: 0.1mm ≤ L1 ≤ 20mm; and / or,

[0022] The thickness S1 of the first adhesive layer satisfies the following relationship: 0.1mm ≤ S1 ≤ 20mm; and / or,

[0023] The thickness L2 of the second protective layer satisfies the following relationship: 0.1mm ≤ L2 ≤ 20mm; and / or,

[0024] The thickness S2 of the second adhesive layer satisfies the relationship: 0.1mm≤S2≤20mm; this setting ensures that the foamed metal layer, the first protective layer, the second protective layer, the first adhesive layer, and the second adhesive layer all have specific thickness ranges, which can improve the deformation resistance of the protective plate and ensure the structural stability and function of the battery pack.

[0025] In some embodiments, the foamed metal layer includes at least one of a foamed aluminum layer, a foamed nickel layer, a foamed copper layer, and a foamed magnesium layer; this configuration allows for multiple selections of the foamed metal layer to meet different performance requirements of the battery pack, such as lightweighting, heat dissipation, and corrosion resistance; and / or,

[0026] The first protective layer comprises at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate; and / or,

[0027] The second protective layer includes at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate; this arrangement allows both the first and second protective layers to have multiple material options, which can be adapted to different protection scenarios and effectively fix and protect the battery cell.

[0028] In some embodiments, the protective plate is fixed to the side wall of the cavity by at least one of welding, bonding, snap-fitting, and screwing. This arrangement allows the protective plate to be fixed to the side wall of the cavity in multiple ways to meet different application scenarios. It can not only provide a seal for the battery pack and facilitate the maintenance of the battery pack, but also ensure that the protective plate can reliably fix the battery cell.

[0029] Secondly, embodiments of this utility model provide a battery pack, which includes battery cells and a battery case. The battery case is the aforementioned battery case, and the battery cells are disposed in the cavity. Along the inner and outer directions of the cavity, the protective plate is located on the outer side of the battery cells. This arrangement enables the battery case with the protective plate to provide reliable fixation and protection for the battery cells, thereby improving the safety and reliability of the battery pack.

[0030] In this application, a protective plate is disposed on the side wall of the cavity and located outside the battery cell. When the battery cell undergoes thermal runaway and expands, the protective plate can effectively resist the displacement of the battery cell caused by thermal runaway. During this process, because multiple micropores are provided on the foamed metal layer of the protective plate, the foamed metal layer has the mechanical advantage of resisting deformation. When the protective plate is subjected to the expansion force generated by the expansion of the battery cell, the pore walls of the micropores will bend and deform, thereby diffusing the expansion force on the foamed metal layer to the surrounding area, dispersing the originally relatively concentrated expansion force over a larger area. This reduces the deformation of the foamed metal layer caused by the expansion force, making the protective plate less prone to deformation under expansion force. This effectively fixes the battery cell and prevents the battery cell from shifting due to thermal runaway expansion. At the same time, the protective plate can also effectively prevent the expansion force from acting directly on the side wall of the casing and causing deformation of the casing, improving the reliability of the battery pack.

[0031] In other words, compared with crossbeams such as aluminum extruded beams in related technologies, the protective plate of this application uses a foamed metal layer with multiple micropores, which can effectively improve the deformation resistance of the protective plate, making it less prone to deformation under the action of expansion force. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a perspective view of the battery pack provided in an embodiment of the present invention;

[0034] Figure 2 This is an exploded view of the battery pack provided in an embodiment of this utility model;

[0035] Figure 3 This is a schematic diagram of the battery pack (with the cover removed) provided in an embodiment of the present invention from a first-view perspective;

[0036] Figure 4 This is a three-dimensional schematic diagram of the protective plate provided in an embodiment of this utility model;

[0037] Figure 5 for Figure 4 Enlarged view of section A;

[0038] Figure 6 This is a schematic diagram of the protective plate provided in an embodiment of the present invention from a second perspective;

[0039] Figure 7 for Figure 6 Enlarged view of section B;

[0040] Figure 8 This is a three-dimensional schematic diagram of the foamed metal layer provided in an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of the foamed metal layer provided in an embodiment of the present invention from a second perspective.

[0042] 100. Battery box; 10. Box body; 11. Cavity; 12. Main body; 13. Cover plate; 14. Circumferential side wall; 141. First side wall; 142. Second side wall; 15. Predetermined gap; 151. First gap; 152. Second gap; 20. Protective plate; 21. Foamed metal layer; 211. Micropores; 212. First side; 213. Second side; 22. First protective layer; 23. Second protective layer; 24. First adhesive layer; 25. Second adhesive layer; 200. Battery pack; 210. Battery cell. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0044] As mentioned in the background section, in related technologies, new energy batteries are increasingly leaning towards CTP (Cell to Pack, module-free technology) and CTB (Cell to Body, cell-body integrated technology) assembly technologies. Because these assembly technologies eliminate traditional end plates, side plates, and steel strips that constrain cell expansion, the expansion force of the cell acts entirely on the end beam of the battery pack, resulting in increased deformation of the end beam. To solve this problem, related technologies generally increase the number of reinforcing ribs in the aluminum extrusion beam or use steel rolling processes to manufacture the expansion beam. However, these solutions still cannot effectively solve the problem of easy deformation of the end beam.

[0045] To address the problems existing in the relevant technologies, see [link / reference]. Figures 1 to 5 , Figure 8 as well as Figure 9 As shown, this application provides a battery pack 200, which includes a battery cell 210 and a battery case 100. The battery case 100 includes a case body 10 and a protective plate 20. The case body 10 has an interior cavity 11. The protective plate 20 is disposed on the side wall of the cavity 11 and includes a foamed metal layer 21. The surface and / or interior of the foamed metal layer 21 have a plurality of micropores 211. The battery cell 210 is disposed in the cavity 11, and the protective plate 20 is located outside the battery cell 210 along the inward and outward directions of the cavity 11.

[0046] In this application, the protective plate 20 is disposed on the side wall of the cavity 11 and located outside the battery cell 210. When the battery cell 210 undergoes thermal runaway and expands, the protective plate 20 can effectively resist the displacement of the battery cell 210 caused by thermal runaway. During this process, because the foamed metal layer 21 of the protective plate 20 is provided with multiple micropores 211, the foamed metal layer 21 has the mechanical advantage of resisting deformation. When the protective plate 20 is subjected to the expansion force generated by the expansion of the battery cell, the pore walls of the micropores 211 will bend and deform, thereby diffusing the expansion force on the foamed metal layer 21 to the surrounding area, dispersing the originally relatively concentrated expansion force to a larger area. This reduces the deformation of the foamed metal layer 21 caused by the expansion force, making the protective plate 20 less prone to deformation when subjected to expansion force. In this way, the battery cell 210 can be effectively fixed, preventing the battery cell from displacing due to thermal runaway expansion. Meanwhile, the protective plate 20 can also effectively prevent the expansion force from acting directly on the side wall of the box 10, causing the box 10 to deform, thus improving the reliability of the battery pack 200.

[0047] In other words, compared with crossbeams such as aluminum extruded beams in related technologies, the protective plate 20 of this application adopts a foamed metal layer 21 with multiple micropores 211, which can effectively improve the deformation resistance of the protective plate 20, making the protective plate 20 less prone to deformation under the action of expansion force.

[0048] It is understood that in this application, the surface and / or interior of the foamed metal layer 21 have multiple micropores 211. This means that multiple micropores 211 can be provided only on the surface of the foamed metal layer 21, or only inside the foamed metal layer 21, or simultaneously on both the surface and interior of the foamed metal layer 21. In other words, the location of the micropores 211 can be reasonably adjusted according to actual conditions and needs, and this application does not impose specific limitations. Furthermore, this embodiment shows the case where multiple micropores 211 are provided on both the surface and interior of the foamed metal layer 21. In addition, compared to pure metal of the same volume, the presence of multiple micropores 211 on the foamed metal layer 21 effectively reduces the density of the foamed metal layer 21, thereby reducing the weight of the protective plate 20. The weight reduction of the protective plate 20 indirectly increases the battery pack 200's range. Therefore, this application's use of a protective plate 20 composed of a foamed metal layer 21 can effectively improve the battery pack 200's range.

[0049] In some embodiments, see Figures 1 to 3 As shown, the box 10 includes a main body 12 and a cover plate 13. The main body 12 has a cavity 11 inside. The cover plate 13 covers the top of the main body 12. Along the circumferential direction of the cavity 11, the protective plate 20 is disposed on the circumferential side wall 14 of the cavity 11.

[0050] Specifically, the circumferential direction of cavity 11 is... Figure 3 The protective plate 20 is arranged on the circumferential sidewall 14 along the circumferential direction of the cavity 11, which can resist the impact of the expansion force from the battery cell 210 from all directions and prevent the battery cell 210 from shifting within the cavity 11. The cover plate 13 is placed on top of the main body 12 and works together with the main body 12 to effectively block dust, moisture and other impurities from entering the cavity 11, providing a good sealing environment for the battery cell 210 and preventing damage to the battery cell 210 due to impurities. The main body 12, the cover plate 13 and the protective plate 20 constitute a complete and stable structural system. The protective plate 20 enhances the strength of the circumferential sidewall 14, and the cover plate 13 cooperates with the main body 12 to improve the overall rigidity of the battery box 100, so that the battery box 100 can better withstand external pressure and the expansion force generated by the battery pack, and avoid deformation of the box 10 that would affect the performance of the battery cell 210. Meanwhile, the protective plate 20 is set on the circumferential side wall 14, which can restrict the position of the battery cell 210 in the cavity 11, prevent the battery cell 210 from shaking or colliding during transportation or use, ensure the stable connection between the battery cells 210, and ensure that the battery pack 200 can work normally.

[0051] It is understood that in this application, protective plates 20 can be provided around the cavity 11 along the circumference to fix the battery cells 210. Since in the actual manufacturing of the battery pack 200 of this application, the main body 12 is generally configured as a cuboid structure, and the multiple battery cells 210 are arranged along the length of the cuboid (i.e., along the length of the cuboid). Figure 3 As shown in the figure, the cells 210 are arranged side by side along the length direction. When thermal expansion occurs, the expansion of the cells 210 along the length direction of the body 12 is more significant. Therefore, the cells 210 are more likely to displace along the length direction of the body 12. Therefore, in this embodiment, protective plates 20 are provided on opposite sides of the circumferential sidewall 14 along the length direction of the body 12. This arrangement not only effectively prevents the cells 210 from displacing, but also saves costs to a certain extent and is more conducive to manufacturing.

[0052] In some embodiments, see Figures 1 to 3As shown, a predetermined gap 15 exists between the protective plate 20 and the circumferential sidewall 14. Specifically, the predetermined gap 15 between the protective plate 20 and the circumferential sidewall 14 serves as a buffer space. When the battery cell 210 undergoes thermal runaway and expands, the protective plate 20 inevitably deforms slightly under the expansion force of the battery cell 210. The predetermined gap 15 provides a certain buffer space for the deformation of the protective plate 20, while also preventing the expansion force from directly acting on the sidewall of the housing 10 and causing deformation of the housing 10. Furthermore, when the battery pack 200 is subjected to external impact, the predetermined gap 15 can effectively prevent the external impact from affecting the battery cell 210, thereby ensuring that the battery cell 210 can operate normally. In this embodiment, along the length of the main body 12, the opposite sides of the circumferential sidewall 14 are a first sidewall 141 and a second sidewall 142, respectively. A first gap 151 exists between the protective plate 20 near the first sidewall 141 and the first sidewall 141, and a second gap 152 exists between the protective plate 20 near the second sidewall 142 and the second sidewall 142. The width of the second gap 152 is greater than the width of the first gap 151. This arrangement allows for a more rational internal layout of the battery pack 200. Furthermore, the first gap 151 and the second gap 152 provide space for the installation of other components of the battery pack 200, facilitating internal integration and improving the space utilization rate within the battery pack 200.

[0053] In some embodiments, see Figures 1 to 3 As shown, protective plates 20 are provided on both opposite sides of the cavity 11 along the circumferential direction of the cavity 11.

[0054] Specifically, in this application, along the circumferential direction of the cavity 11, the opposite sides of the cavity 11 can be reasonably selected according to actual conditions (e.g., the arrangement of the battery cells 210) and needs; this application does not impose specific limitations. When the general shape of the battery box 100 is as follows... Figures 1 to 3 In the cuboid structure shown, if the arrangement of the battery cells 210 makes it easier for the battery cells 210 to shift along the length direction of the cuboid when they undergo thermal expansion, then the opposite sides of the cavity 11 can be selected as opposite sides along the length direction of the cuboid; if the arrangement of the battery cells 210 makes it easier for the battery cells 210 to shift along the width direction perpendicular to the length direction of the cuboid (i.e.,...) when they undergo thermal expansion... Figure 3If the cavity 11 is displaced in the width direction shown, then the opposite sides of the cavity 11 can be selected as opposite sides along the width direction of the cuboid. This embodiment shows the case where the opposite sides of the cavity 11 are opposite sides along the length direction of the cuboid. The protective plates 20 located on the opposite sides of the cavity 11 can not only effectively fix the battery cell 210 in the length direction of the cuboid, but also effectively fix the battery cell 210 in the width direction of the cuboid, because in this embodiment, the protective plates 20 are in contact with the outer side of the battery cell 210 (e.g., ...). Figure 3 As shown, the friction between the protective plate 20 and the battery cell 210 can effectively prevent the battery cell 210 from moving along the width direction of the cuboid.

[0055] In some embodiments, see Figure 2 , Figure 4 as well as Figure 5 As shown, the protective plate 20 also includes a first protective layer 22, which is disposed on the first side 212 of the foamed metal layer 21 near the circumferential sidewall 14 along the inner and outer directions of the cavity 11.

[0056] Specifically, along the inner and outer directions of the cavity 11, the first protective layer 22 is disposed on the first side 212 of the foamed metal layer 21 near the circumferential sidewall 14. In this way, the first protective layer 22 can effectively protect the first side 212 of the foamed metal layer 21. Since the first side 212 of the foamed metal layer 21 has multiple micropores 211, if the first protective layer 22 is not disposed on the first side 212 of the foamed metal layer 21, when solid impurities or the like enter the cavity 11, these solid impurities can easily enter the interior of the foamed metal layer 21 through the micropores 211 of the first side 212. The introduction of solid impurities increases the weight of the foamed metal layer 21, which in turn increases the weight of the battery pack 200, thus reducing its range. Therefore, this application provides a first protective layer 22 on the first side 212 of the foamed metal layer 21, which seals the first side 212 and prevents solid impurities from entering the interior of the foamed metal layer 21 through the micropores 211 of the first side 212, thereby preventing the foamed metal layer 21 from becoming heavier. In addition, the first protective layer 22 itself has a certain structural strength, which can increase the strength of the protective plate 20 to a certain extent, making the protective plate 20 more resistant to the expansion force from the battery cell 210 or external impacts, thereby preventing the protective plate 20 from deforming.

[0057] Optionally, the protective plate 20 further includes a second protective layer 23, which is disposed on the second side 213 of the foamed metal layer 21 opposite to the first side 212 along the inward and outward directions of the cavity 11. Specifically, the second protective layer 23 is disposed on the second side 213 of the foamed metal layer 21 along the inward and outward directions of the cavity 11, so that when the protective plate 20 comes into contact with the battery cell 210, the second protective layer 23 can make contact with the battery cell 210 first. Compared with the surface of the foamed metal layer 21, the surface of the second protective layer 23 is relatively flat, which can prevent the battery cell 210 from being scratched by the foamed metal layer 21. If the second side 213 of the foamed metal layer 21 is not provided with the second protective layer 23, and the second side 213 of the foamed metal layer 21 is in direct contact with the battery cell 210, it is easy to cause a safety accident. Because the second side 213 of the foamed metal layer 21 has multiple micropores 211, this may cause the second side 213 of the foamed metal layer 21 to be uneven. Since burrs or other sharp structures may appear at the openings of the micropores 211, if the second side 213 with burrs or other sharp structures comes into direct contact with the battery cell 210, it can easily scratch the battery cell 210. This may cause the battery cell 210 to malfunction, and in severe cases, even cause the battery cell 210 to catch fire. Therefore, this application provides a second protective layer 23 on the second side 213 of the foamed metal layer 21. In addition, the second protective layer 23 can also seal the second side 213 of the foamed metal layer 21. The second protective layer 23 can prevent solid impurities from entering the interior of the foamed metal layer 21 through the micropores 211 of the second side 213, thereby preventing the foamed metal layer 21 from becoming heavier. The increased weight of the foamed metal layer 21 will lead to an increase in the weight of the battery pack 200, which will reduce the battery pack 200's range. Therefore, the second protective layer 23 can not only protect the foamed metal layer 21, but also improve the battery pack 200's range to a certain extent.

[0058] It is understandable that the first protective layer 22 and the second protective layer 23 also facilitate the installation of the protective plate 20. Because the foamed metal layer 21 has micropores 211, if the foamed metal layer 21 is directly fixed inside the housing 10, it is prone to detaching from the housing 10 when subjected to the expansion force from the battery cell 210 or external impact. Therefore, this application provides the first protective layer 22 and the second protective layer 23 on opposite sides of the foamed metal layer 21. In other words, the first protective layer 22 and the second protective layer 23 not only facilitate the installation of the protective plate 20 but also enhance the connection between the protective plate 20 and the housing 10, making it less likely for the foamed metal layer 21 to detach from the housing 10.

[0059] In some embodiments, see Figure 2 , Figure 4 as well as Figure 5 As shown, the protective plate 20 also includes a first adhesive layer 24, which is bonded between the foamed metal layer 21 and the first protective layer 22.

[0060] Specifically, the first adhesive layer 24 is bonded between the foamed metal layer 21 and the first protective layer 22, ensuring a tight fit between them and forming a stable overall structure. For example, when the battery pack 200 is subjected to external forces such as vibration or impact, or when the protective plate 20 is subjected to expansion forces from the battery cell 210, the first adhesive layer 24 effectively prevents relative displacement between the foamed metal layer 21 and the first protective layer 22, ensuring that the protective plate 20 can continuously and stably perform its protective function, effectively protecting the battery cell 210. Furthermore, the first adhesive layer 24 fills the tiny gaps between the foamed metal layer 21 and the first protective layer 22, making the protective plate 20 more continuous in its protective function. This helps prevent external impacts or foreign objects from intruding through the gaps and affecting the normal functioning of the protective plate 20. In the actual manufacturing process, before bonding the foamed metal layer 21 and the first protective layer 22, the first side 212 of the foamed metal layer 21 needs to be polished. This is because the openings of the micropores 211 on the first side 212 may have sharp structures such as burrs. If the first side 212 of the foamed metal layer 21 is not polished, the bonding performance of the first adhesive layer 24 will be affected. Furthermore, sharp structures such as burrs may also cause direct contact between the first adhesive layer 24 and the first protective layer 22, damaging the first protective layer 22. Therefore, the first side 212 of the foamed metal layer 21 needs to be polished before bonding the foamed metal layer 21 and the first protective layer 22.

[0061] Optionally, the protective panel 20 further includes a second adhesive layer 25, which is bonded between the foamed metal layer 21 and the second protective layer 23.

[0062] Specifically, the second adhesive layer 25 is bonded between the foamed metal layer 21 and the second protective layer 23, ensuring a tight fit between them and forming a stable overall structure. For example, when the battery pack 200 is subjected to external forces such as vibration or impact, or when the protective plate 20 is subjected to expansion forces from the battery cell 210, the second adhesive layer 25 effectively prevents relative displacement between the foamed metal layer 21 and the second protective layer 23, ensuring that the protective plate 20 can continuously and stably perform its protective function and effectively protect the battery cell 210. Furthermore, the second adhesive layer 25 fills the tiny gaps between the foamed metal layer 21 and the second protective layer 23, making the protective plate 20 more continuous in its protective function. This helps prevent external impacts or foreign objects from intruding through the gaps and affecting the normal functioning of the protective plate 20. In the actual manufacturing process, before bonding the foamed metal layer 21 and the second protective layer 23, the second side 213 of the foamed metal layer 21 needs to be polished. This is because the openings of the micropores 211 on the second side 213 may have sharp structures such as burrs. If the second side 213 of the foamed metal layer 21 is not polished, the bonding performance of the second adhesive layer 25 will be affected. Furthermore, sharp structures such as burrs may penetrate the second adhesive layer 25 and directly contact the second protective layer 23, causing damage to the second protective layer 23. Therefore, the second side 213 of the foamed metal layer 21 needs to be polished before bonding the foamed metal layer 21 and the second protective layer 23.

[0063] In some embodiments, see Figure 2 , Figure 6 as well as Figure 7 As shown, the thickness D of the foamed metal layer 21 and the thickness L1 of the first protective layer 22 satisfy the relationship: 0.05 ≤ D / L1 ≤ 3000. Specifically, when the thickness D of the foamed metal layer 21 and the thickness L1 of the first protective layer 22 satisfy 0.05 ≤ D / L1 ≤ 3000, the foamed metal layer 21 has a suitable thickness ratio relative to the first protective layer 22, which can fully utilize the buffering characteristics of the foamed metal layer 21. Compared to the first protective layer 22, a thicker foamed metal layer 21 can absorb more impact energy. For example, when the protective plate 20 is subjected to the expansion force impact from the battery cell 210 or other external forces, the foamed metal layer 21 can effectively buffer the impact force, reduce the impact on the first protective layer 22 and the internal components of the battery box 100, and ensure the safety of the battery cell 210 and other internal components of the battery pack 200. At the same time, the thickness L1 of the first protective layer 22 is matched with the thickness D of the foamed metal layer 21 to ensure the overall strength of the protective plate 20. Furthermore, this design ensures that the first protective layer 22 is not too thin, thus making it less prone to deformation and breakage when subjected to external forces. Together with the foamed metal layer 21, it resists impact and prevents the protective plate 20 from easily deforming under external forces. This allows the protective plate 20 to effectively fix the battery cell 210 and prevent the battery cell 210 from shifting.

[0064] Optionally, the thickness D of the foamed metal layer 21 and the thickness S1 of the first adhesive layer 24 satisfy the relationship: 0.05 ≤ D / S1 ≤ 3000. Specifically, when the thickness D of the foamed metal layer 21 and the thickness S1 of the first adhesive layer 24 satisfy 0.05 ≤ D / S1 ≤ 3000, the thicknesses of the foamed metal layer 21 and the first adhesive layer 24 are matched, ensuring a stable connection between them. For example, when the protective plate 20 is subjected to an impact from the expansion force of the battery cell 210 or other external forces, the first adhesive layer 24 has sufficient thickness to provide adhesive force, firmly connecting the foamed metal layer 21 and the first protective layer 22, preventing the connection between the foamed metal layer 21 and the first protective layer 22 from failing due to the first adhesive layer 24 being too thin, thereby maintaining the overall stability of the protective plate 20.

[0065] Optionally, the thickness L1 of the first protective layer 22 and the thickness S1 of the first adhesive layer 24 satisfy the relationship: 0.005 ≤ L1 / S1 ≤ 200. Specifically, when the thickness L1 of the first protective layer 22 and the thickness S1 of the first adhesive layer 24 satisfy 0.005 ≤ L1 / S1 ≤ 200, the thickness ratio of the first protective layer 22 to the first adhesive layer 24 is appropriate, ensuring a reliable connection between them. The first adhesive layer 24 has sufficient thickness to provide adequate adhesive force, firmly bonding the first protective layer 22 to the foamed metal layer 21. For example, when the protective plate 20 is subjected to an expansion force impact from the battery cell 210 or other external forces, the first adhesive layer 24 can effectively bond the first protective layer 22 tightly to the foamed metal layer 21, thereby preventing the first protective layer 22 from separating from the foamed metal layer 21, ensuring the integrity and stability of the protective plate 20, and thus enabling the protective plate 20 to effectively fix the battery cell 210, preventing the battery cell 210 from shifting.

[0066] Optionally, the thickness D of the foamed metal layer 21 and the thickness L2 of the second protective layer 23 satisfy the relationship: 0.05 ≤ D / L2 ≤ 3000. Specifically, when the thickness D of the foamed metal layer 21 and the thickness L2 of the second protective layer 23 satisfy 0.05 ≤ D / L2 ≤ 3000, the thickness ratio of the foamed metal layer 21 to the second protective layer 23 ensures that they can effectively cooperate to cope with the impact of expansion force or other external forces from the battery cell 210. With its special structure (i.e., a structure with multiple micropores 211) and appropriate thickness, the foamed metal layer 21 can absorb a large amount of energy when subjected to impact. For example, when the protective plate 20 is impacted by the expansion force from the battery cell 210, the second protective layer 23 first resists the impact force on the side close to the battery cell 210. When the impact force is transmitted to the foamed metal layer 21, the foamed metal layer 21 can buffer the impact force, so that the protective plate 20 is not easily deformed under the action of expansion force, and thus can effectively fix the battery cell 210 and prevent the battery cell 210 from being displaced.

[0067] Optionally, the thickness D of the foamed metal layer 21 and the thickness S2 of the second adhesive layer 25 satisfy the relationship: 0.05 ≤ D / S2 ≤ 3000. Specifically, when the thickness D of the foamed metal layer 21 and the thickness S2 of the second adhesive layer 25 satisfy 0.05 ≤ D / S2 ≤ 3000, the thickness ratio of the foamed metal layer 21 to the second adhesive layer 25 ensures sufficient bonding strength between them. The second adhesive layer 25, with its suitable thickness, provides sufficient adhesive force to firmly bond the foamed metal layer 21 to the second protective layer 23. For example, when the protective plate 20 is subjected to an impact from the expansion force of the battery cell 210 or other external forces, the second adhesive layer 25 can effectively maintain the connection between the foamed metal layer 21 and the second protective layer 23, preventing separation and ensuring the integrity of the protective plate 20, thus improving its reliability.

[0068] Optionally, the thickness L2 of the second protective layer 23 and the thickness S2 of the second adhesive layer 25 satisfy the relationship: 0.005 ≤ L2 / S2 ≤ 200. Specifically, when the thickness L2 of the second protective layer 23 and the thickness S2 of the second adhesive layer 25 satisfy 0.005 ≤ L2 / S2 ≤ 200, the thickness ratio of the second protective layer 23 to the second adhesive layer 25 is appropriate, ensuring that the second adhesive layer 25 provides reliable adhesive force for the second protective layer 23. When the protective plate 20 is subjected to the expansion force impact from the battery cell 210 or other external force impacts (such as bumps and vibrations during transportation or accidental impacts that may be encountered during use), the second adhesive layer 25, with its appropriate thickness, can generate sufficient adhesive force to firmly attach the second protective layer 23 to the foamed metal layer 21, preventing the second protective layer 23 from falling off the foamed metal layer 21, ensuring the integrity of the protective plate 20, and improving the reliability of the protective plate 20.

[0069] In some embodiments, see Figure 2 , Figure 6 as well as Figure 7As shown, the thickness D of the foamed metal layer 21 satisfies the relationship: 1mm ≤ D ≤ 300mm. Specifically, when the thickness D of the foamed metal layer 21 satisfies 1mm ≤ D ≤ 300mm, the foamed metal layer 21 can play a good buffering role during the thermal runaway expansion of the battery cell 210. A thicker foamed metal layer 21 (i.e., close to 300mm) can absorb a large amount of energy through deformation of its internal microporous structure when subjected to a large impact force, buffering the impact force like a sponge, reducing the impact force on the entire protective plate 20, and preventing the battery cell 210 from shifting. A thinner foamed metal layer 21 (i.e., close to 1mm) is generally used in some small battery packs 200. For some small vibrations or slight impacts, the foamed metal layer 21 can still play a certain buffering role, preventing the battery cell 210 from shifting due to the deformation of the protective plate 20.

[0070] Optionally, the thickness L1 of the first protective layer 22 satisfies the relationship: 0.1mm ≤ L1 ≤ 20mm. Specifically, when the thickness L1 of the first protective layer 22 satisfies 0.1mm ≤ L1 ≤ 20mm, the first protective layer 22 can resist the impact of the expansion force from the battery cell 210 to varying degrees. When the thickness L1 of the first protective layer 22 is relatively thick (i.e., close to 20mm), for larger impacts, the first protective layer 22 can withstand and disperse the impact force due to its high strength, reducing the impact force transmitted to the circumferential sidewall 14 and ensuring the reliability of the overall structure of the battery pack 200. When the thickness L1 of the first protective layer 22 is relatively thin (i.e., close to 0.1 mm), this type of first protective layer 22 (i.e., the first protective layer 22 with a relatively thin thickness L1) is generally used on some small battery packs 200. In this case, the expansion force of the cell 210 during thermal runaway expansion is also relatively small. Therefore, the expansion force on the first protective layer 22 is relatively small. For this small expansion force impact, the first protective layer 22 can still play a certain role in resisting and preventing the cell 210 from shifting due to thermal runaway expansion.

[0071] Optionally, the thickness S1 of the first adhesive layer 24 satisfies the relationship: 0.1mm ≤ S1 ≤ 20mm. Specifically, when the thickness S1 of the first adhesive layer 24 satisfies 0.1mm ≤ S1 ≤ 20mm, it ensures a firm bond between the first protective layer 22 and the foamed metal layer 21. A thicker first adhesive layer 24 (i.e., close to 20mm) provides stronger adhesive force. When the protective plate 20 is subjected to the expansion force impact from the cell 210 or other external forces, the first adhesive layer 24 ensures that the first protective layer 22 and the foamed metal layer 21 are tightly connected and will not separate due to external forces, maintaining the integrity of the protective plate 20 and thus protecting the stability of the internal structure of the battery pack 200. When the first adhesive layer 24 is relatively thin (i.e. close to 0.1 mm), although the adhesive force of the first adhesive layer 24 is relatively weak, it can still maintain the connection between the first protective layer 22 and the foamed metal layer 21 under normal vibration and small external force, ensuring that the protective plate 20 can work normally.

[0072] Optionally, the thickness L2 of the second protective layer 23 satisfies the relationship: 0.1mm ≤ L2 ≤ 20mm. Specifically, when the thickness L2 of the second protective layer 23 satisfies 0.1mm ≤ L2 ≤ 20mm, the second protective layer 23 can resist the impact of the expansion force from the battery cell 210 to varying degrees. When the thickness L1 of the second protective layer 23 is relatively thick (i.e., close to 20mm), for larger impacts, the second protective layer 23 can withstand and disperse the impact force due to its high strength, reducing the impact force transmitted to the circumferential sidewall 14 and ensuring the reliability of the overall structure of the battery pack 200. When the thickness L2 of the second protective layer 23 is relatively thin (i.e., close to 0.1 mm), this type of second protective layer 23 (i.e., the second protective layer 23 with a relatively thin thickness L2) is generally used on some small battery packs 200. In this case, the expansion force of the cell 210 during thermal runaway expansion is also relatively small. Therefore, the expansion force on the second protective layer 23 is relatively small. For this small expansion force impact, the second protective layer 23 can still play a certain role in resisting and preventing the cell 210 from displaced due to thermal runaway expansion.

[0073] Optionally, the thickness S2 of the second adhesive layer 25 satisfies the relationship: 0.1mm ≤ S2 ≤ 20mm. Specifically, when the thickness S2 of the second adhesive layer 25 satisfies 0.1mm ≤ S2 ≤ 20mm, it ensures a strong bond between the second protective layer 23 and the foamed metal layer 21. A thicker second adhesive layer 25 (i.e., close to 20mm) provides stronger adhesive force. When the protective plate 20 is subjected to the expansion force impact from the cell 210 or other external forces, the second adhesive layer 25 ensures that the second protective layer 23 and the foamed metal layer 21 are tightly connected and will not separate due to external forces, maintaining the integrity of the protective plate 20 and thus protecting the stability of the internal structure of the battery pack 200. When the second adhesive layer 25 is relatively thin (i.e. close to 0.1 mm), although the adhesive force of the second adhesive layer 25 is relatively weak, it can still maintain the connection between the second protective layer 23 and the foamed metal layer 21 under normal vibration and small external force, ensuring that the protective plate 20 can work normally.

[0074] In some embodiments, see Figure 2 , Figure 5 , Figure 8 as well as Figure 9 As shown, the foamed metal layer 21 includes at least one of a foamed aluminum layer, a foamed nickel layer, a foamed copper layer, and a foamed magnesium layer. Specifically, the foamed metal layer 21 includes at least one of a foamed aluminum layer, a foamed nickel layer, a foamed copper layer, and a foamed magnesium layer, which can meet the different performance requirements of the battery pack 200. For example, the low density of the foamed aluminum layer can achieve a lightweight battery pack 200, which is suitable for weight-sensitive applications, such as battery packs for electric vehicles, where weight reduction helps to improve driving range. The foamed copper layer has good thermal conductivity and can efficiently conduct heat. In battery packs with high heat dissipation requirements, it can quickly transfer the heat generated by the cell 210 to maintain the appropriate operating temperature of the cell 210. At the same time, the foamed metal layers 21 of different materials have different protective properties. The foamed nickel layer has strong corrosion resistance and can fix and protect the cell 210 in harsh environments, such as battery packs 200 used in humid or corrosive gas environments. The foamed magnesium layer has excellent energy absorption properties, effectively absorbing energy upon impact and enhancing the protective plate 20's ability to resist external impacts or expansion forces, preventing displacement of the battery cell 210. In other words, the specific composition of the foamed metal layer 21 can be reasonably adjusted according to actual conditions and needs, and this application does not impose specific limitations. Furthermore, this embodiment shows the case where the foamed metal layer 21 is a foamed aluminum layer.

[0075] Optionally, the first protective layer 22 includes at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate. Specifically, the first protective layer 22 includes at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate to meet different protection requirements. The aluminum plate is relatively soft and has a certain degree of ductility. When subjected to minor impacts, it can absorb energy through its own deformation, providing some protection to the foamed metal layer 21. The aluminum alloy plate has high strength. For larger collisions and compressions, the aluminum alloy plate can resist external forces with its high strength, preventing expansion forces or external forces from deforming the protective plate 20. The magnesium alloy plate is lightweight and has good energy absorption characteristics. While reducing the overall weight of the battery pack 200, it can effectively absorb impact energy, enhance the protective plate 20's ability to fix the battery cell 210, and prevent the battery cell 210 from shifting. The titanium alloy plate has extremely high strength and corrosion resistance. In harsh environments or when facing high-intensity impacts, the first protective layer 22 can provide reliable protection for the battery pack 200. In other words, the specific composition of the first protective layer 22 in this application can be reasonably adjusted according to actual conditions and needs, and this application does not impose specific limitations. Furthermore, this embodiment shows the case where the first protective layer 22 is an aluminum plate.

[0076] Optionally, the second protective layer 23 includes at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate. Specifically, the second protective layer 23 includes at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate to meet different protection requirements. The aluminum plate is relatively soft and has a certain degree of ductility. When subjected to minor impacts, the second protective layer 23 can absorb energy through its own deformation, providing some protection to the foamed metal layer 21. The aluminum alloy plate has high strength. For larger collisions and compressions, the aluminum alloy plate can resist external forces with its high strength, preventing expansion forces or external forces from deforming the protective plate 20. The magnesium alloy plate is lightweight and has good energy absorption characteristics. While reducing the overall weight of the battery pack 200, it can effectively absorb impact energy, enhance the protective plate 20's ability to fix the battery cell 210, and prevent the battery cell 210 from shifting. The titanium alloy plate has extremely high strength and corrosion resistance, providing reliable protection for the battery pack 200 in harsh environments or when facing high-intensity impacts. In other words, the specific composition of the second protective layer 23 in this application can be reasonably adjusted according to actual conditions and needs, and this application does not impose specific limitations. Furthermore, this embodiment shows the case where the second protective layer 23 is an aluminum plate.

[0077] In some embodiments, see Figures 1 to 3 As shown, the protective plate 20 is fixed to the side wall of the cavity 11 by at least one of welding, bonding, snap-fitting and screwing.

[0078] Specifically, the protective plate 20 can be fixed to the side wall of the cavity 11 by at least one of welding, bonding, snap-fitting, and screwing, which can meet the needs of different application scenarios of the battery pack 200. For example, in scenarios with extremely high sealing requirements, welding can make the protective plate 20 tightly and seamlessly connected to the side wall, and together with the cover plate 13, it can prevent impurities from entering the space where the battery cell 210 is located. In situations where quick assembly and disassembly are required, snap-fitting or screwing is more suitable, making it convenient for maintenance personnel to inspect. Bonding is suitable for environments with strict weight requirements and low vibration, which can reduce the overall weight of the battery pack 200; while in environments with high vibration, such as during the driving of electric vehicles, screwing or welding can provide a more stable connection, ensuring that the protective plate 20 does not loosen under long-term vibration, thereby effectively fixing the battery cell 210. That is to say, in this application, the connection method between the protective plate 20 and the side wall of the cavity 11 can be reasonably selected according to the actual situation and needs. This application does not impose specific limitations. At the same time, this embodiment shows the case where the protective plate 20 and the side wall of the cavity 11 are connected by welding. Welding enables the protective plate 20 to form a high-strength connection with the side wall of the cavity 11. When the protective plate 20 is subjected to a large expansion force or external force impact, the connection between the protective plate 20 and the side wall of the cavity 11 is not prone to breakage, thereby effectively fixing the battery cell 210 and improving the reliability of the battery pack 200.

[0079] In summary, the battery box and battery pack of this application have at least the following beneficial effects:

[0080] (1) The use of a foamed metal layer with micropores as one of the main components of the protective plate not only improves the deformation resistance of the protective plate, but also reduces the weight of the battery pack and improves the battery pack's range.

[0081] (2) Protective plates are installed on the circumferential sidewalls along the circumferential direction of the cavity to resist the expansion force from the battery cell in all directions, making the battery pack structure more reliable.

[0082] (3) A predetermined gap is provided between the protective plate and the side wall, so that the protective plate has a certain buffer space to avoid deformation of the box and optimize the internal layout of the battery pack.

[0083] (4) Protective plates are provided on both sides of the cavity to fix the battery cell in both directions, prevent the battery cell from thermally running away and expanding and causing displacement, and ensure the structural stability of the battery pack.

[0084] (5) The first protective layer can seal the micropores to prevent solid impurities from entering the interior of the foamed metal layer and enhance the strength of the protective plate. At the same time, the second protective layer can protect the battery cell and improve the safety of the battery pack.

[0085] (6) The first adhesive layer makes the first protective layer and the foamed metal layer fit together tightly, and the second adhesive layer makes the second protective layer fit together tightly, which can effectively prevent the first protective layer, the second protective layer and the foamed metal layer from moving relative to each other, thus ensuring the protective function of the protective plate.

[0086] (7) A reasonable thickness ratio ensures that the foamed metal layer, the first protective layer, the second protective layer, the first adhesive layer and the second adhesive layer can work together to improve the buffering, connection and deformation resistance of the protective plate.

[0087] (8) The foamed metal layer, the first protective layer, the second protective layer, the first adhesive layer and the second adhesive layer of a specific thickness range play a role in different scenarios, buffering impact, resisting expansion force and ensuring the safety of the battery pack.

[0088] (9) A variety of foamed metal layers are available to meet different performance requirements of the battery pack, such as lightweight, heat dissipation, and corrosion resistance.

[0089] (10) A variety of materials are available for the first and second protective layers, which can be adapted to different protection scenarios and provide reliable fixation for the battery cells.

[0090] (11) The protective plate can be fixed to the side wall of the cavity in a variety of ways to meet different application scenarios. It can not only provide a seal for the battery pack, but also make it easy for maintenance personnel to inspect the battery pack. At the same time, it can also ensure that the protective plate can reliably fix the battery cell.

[0091] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery box (100), characterized in that, include: The box (10) has a cavity (11) inside. A protective plate (20) is disposed on the side wall of the cavity (11), and the protective plate (20) includes a foamed metal layer (21), the surface and / or interior of the foamed metal layer (21) having a plurality of micropores (211). The box (10) includes a main body (12), and the cavity (11) is provided inside the main body (12). The protective plate (20) further includes a first protective layer (22), which is disposed on the first side (212) of the foamed metal layer (21) near the circumferential sidewall (14) of the cavity (11) along the inner and outer directions of the cavity (11); and / or, The protective plate (20) further includes a second protective layer (23), which is disposed on the second side (213) of the foamed metal layer (21) opposite to the first side (212) along the inner and outer directions of the cavity (11).

2. The battery box (100) according to claim 1, characterized in that, The box (10) includes a cover plate (13), which covers the top of the main body (12) along the circumferential direction of the cavity (11), and the protective plate (20) is disposed on the circumferential sidewall (14) of the cavity (11).

3. The battery box (100) according to claim 2, characterized in that, There is a predetermined gap (15) between the protective plate (20) and the circumferential sidewall (14).

4. The battery box (100) according to claim 3, characterized in that, Along the circumferential direction of the cavity (11), the protective plates (20) are provided on both opposite sides of the cavity (11).

5. The battery box (100) according to claim 1, characterized in that, The protective panel (20) further includes a first adhesive layer (24), which is bonded between the foamed metal layer (21) and the first protective layer (22); and / or, The protective plate (20) further includes a second adhesive layer (25), which is bonded between the foamed metal layer (21) and the second protective layer (23).

6. The battery box (100) according to claim 5, characterized in that, The thickness D of the foamed metal layer (21) and the thickness L1 of the first protective layer (22) satisfy the following relationship: 0.05 ≤ D / L1 ≤ 3000; and / or, The thickness D of the foamed metal layer (21) and the thickness S1 of the first adhesive layer (24) satisfy the following relationship: 0.05 ≤ D / S1 ≤ 3000; and / or, The thickness L1 of the first protective layer (22) and the thickness S1 of the first adhesive layer (24) satisfy the following relationship: 0.005 ≤ L1 / S1 ≤ 200; and / or, The thickness D of the foamed metal layer (21) and the thickness L2 of the second protective layer (23) satisfy the following relationship: 0.05 ≤ D / L2 ≤ 3000; and / or, The thickness D of the foamed metal layer (21) and the thickness S2 of the second adhesive layer (25) satisfy the following relationship: 0.05 ≤ D / S2 ≤ 3000; and / or, The thickness L2 of the second protective layer (23) and the thickness S2 of the second adhesive layer (25) satisfy the following relationship: 0.005≤L2 / S2≤200.

7. The battery box (100) according to claim 6, characterized in that, The thickness D of the foamed metal layer (21) satisfies the following relationship: 1mm ≤ D ≤ 300mm; and / or, The thickness L1 of the first protective layer (22) satisfies the following relationship: 0.1mm ≤ L1 ≤ 20mm; and / or, The thickness S1 of the first adhesive layer (24) satisfies the following relationship: 0.1mm ≤ S1 ≤ 20mm; and / or, The thickness L2 of the second protective layer (23) satisfies the following relationship: 0.1mm ≤ L2 ≤ 20mm; and / or, The thickness S2 of the second adhesive layer (25) satisfies the following relationship: 0.1mm≤S2≤20mm.

8. The battery box (100) according to claim 1, characterized in that, The foamed metal layer (21) includes at least one of a foamed aluminum layer, a foamed nickel layer, a foamed copper layer, and a foamed magnesium layer; and / or, The first protective layer (22) comprises at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate; and / or, The second protective layer (23) includes at least one of an aluminum plate, an aluminum alloy plate, a magnesium alloy plate, and a titanium alloy plate.

9. The battery box (100) according to any one of claims 1 to 8, characterized in that, The protective plate (20) is fixed to the side wall of the cavity (11) by at least one of welding, bonding, snap-fitting and screwing.

10. A battery pack (200), characterized in that, The battery pack (200) includes a battery cell (210) and a battery case (100), wherein the battery case (100) is the battery case (100) according to any one of claims 1 to 9, the battery cell (210) is disposed in the cavity (11), and the protective plate (20) is located outside the battery cell (210) along the inner and outer directions of the cavity (11).

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