Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a battery cell, a first box body and a second box body. The first box body is provided with a mounting structure, and comprises a bearing plate and a first side wall plate. One side of the bearing plate in a first direction has a bearing surface for supporting the battery cell in the first direction. The first side wall plate is connected to the bearing plate and protrudes from the bearing surface. The second box body cooperates with the first box body to define an assembly space for accommodating the battery cell. The second box body comprises a top plate and a second side wall plate. The second side wall plate is connected to the first side wall plate, and one end of the second side wall plate away from the bearing plate is connected to the top plate in the first direction. In the first direction, the size of the first side wall plate protruding from the bearing surface is less than one fourth of the maximum size of the second side wall plate. One side of the top plate away from the battery cell is formed with a recess. The recess comprises a first arc-shaped wall surface. The technical scheme of the application can improve the reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the manufacturing process of battery devices, the reliability of the battery device is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery device, which includes a battery cell, a first housing body, and a second housing body. The first housing body is provided with a mounting structure, and includes a support plate and a first side wall plate. The support plate has a support surface on one side in a first direction, which is used to support the battery cell along the first direction. The first side wall plate is connected to the support plate and protrudes from the support surface. The second housing body and the first housing body together define an assembly space for accommodating the battery cell. The second housing body includes a top plate and a second side wall plate. The top plate and the support plate are disposed opposite to each other along the first direction. The second side wall plate is connected to the first side wall plate, and the end of the second side wall plate away from the support plate in the first direction is connected to the top plate. Along the first direction, the dimension of the first side wall plate protruding from the support surface is less than one-quarter of the maximum dimension of the second side wall plate. A recess is formed on the side of the top plate away from the battery cell, and the recess includes a first arc-shaped wall surface.

[0007] According to an embodiment of this application, the battery device includes a first housing body and a second housing body. A first side wall panel of the first housing body and a second side wall panel of the second housing body are connected to each other. The first housing body is provided with a mounting structure for assembly and connection with a target component. This facilitates the support plate of the first housing body supporting and bearing the battery cells, and makes it easier to assemble the battery device onto the target component for power supply. By making the dimension of the first side wall panel protruding from the bearing surface less than one-quarter of the maximum dimension of the second side wall panel, the dimension of the first side wall panel used for assembly and connection with the second housing body is smaller. This optimizes the dimensions of the first housing body in the first direction and reduces the constraint of the first housing body on the second housing body. This reduces the assembly difficulty between the first box body and the target component. By setting at least a portion of the top plate to bulge towards the battery cell, the side of the top plate away from the battery cell in the first direction is recessed towards the battery cell to form a pre-deformed recess. The recess includes a first arc-shaped wall surface, which can evenly distribute the force, reducing the risk of local stress concentration. At the same time, the first arc-shaped wall surface can convert part of the external pressure into compressive stress of internal interaction when subjected to force, and absorb part of the stress through deformation. This reduces the bulging phenomenon or bulging amplitude of the top plate to a certain extent when it is affected by bending moment or stress during use and bulges in the first direction away from the battery cell.

[0008] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the area of ​​the top plate is S1 and the area of ​​the recess is S2, satisfying that 60% ≤ S1 / S2 < 100%.

[0009] If the ratio of the area of ​​the top plate to the area of ​​the recess is too small, the pre-deformation area of ​​the top plate is too small, which is not conducive to absorbing some of the stress through the deformation of the recess of the top plate. This makes the top plate prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use. If the ratio of the area of ​​the top plate to the area of ​​the recess is too large, the manufacturing difficulty is too high, and the top plate is also prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use.

[0010] In the above scheme, by setting the ratio of the area of ​​the top plate to the area of ​​the recess to be greater than or equal to 60%, the top plate has a large pre-deformation area, which facilitates the absorption of some stress through the deformation of the recess in the top plate. Furthermore, when the top plate is subjected to bending moment or stress during use and bulges along the first direction away from the battery cell, the bulging phenomenon or bulging amplitude of the top plate can be reduced to a certain extent. By setting the ratio of the area of ​​the top plate to the area of ​​the recess to be less than 100%, the space occupied by the recess of the top plate towards the battery cell is reduced, and the processing and manufacturing difficulty is lower.

[0011] According to some embodiments of this application, along the second direction, the size of the recess is L1 and the size of the top plate is L2, satisfying that 80% ≤ L1 / L2 < 100%, the second direction is parallel to the length direction of the battery device, and the second direction is perpendicular to the first direction.

[0012] If the ratio of the dimension of the recess along the second direction to the dimension of the top plate along the second direction is too small, the dimension of the recess in the second direction is too small, and the pre-deformation area of ​​the top plate in the second direction is too small. This is not conducive to absorbing some stress through the deformation of the recess in the top plate, making the top plate prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use. If the ratio of the dimension of the recess along the second direction to the dimension of the top plate along the second direction is too large, the manufacturing difficulty is too high, and the top plate is also prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use.

[0013] In the above scheme, by setting the ratio of the size of the recess along the second direction to the size of the top plate along the second direction to be greater than or equal to 80%, the recess has a larger size in the second direction, and the top plate has a larger pre-deformation area in the second direction. This facilitates the absorption of some stress through the deformation of the recess in the top plate, and further reduces the bulging phenomenon or the bulging amplitude of the top plate to a certain extent when it is affected by bending moment or stress during use and bulges along the first direction away from the battery cell. By setting the ratio of the size of the recess along the second direction to the size of the top plate along the second direction to be less than 100%, the space occupied by the recess of the top plate towards the battery cell is reduced, and the processing and manufacturing difficulty is lower.

[0014] According to some embodiments of this application, along a third direction, the size of the recess is W1, and the size of the top plate is W2, satisfying that 90% ≤ W1 / W2 < 100%, the third direction is parallel to the width direction of the battery device, and the third direction is perpendicular to the first direction.

[0015] If the ratio of the size of the recess along the third direction to the size of the top plate along the third direction is too small, the size of the recess in the third direction is too small, and the pre-deformation area of ​​the top plate in the third direction is too small. This is not conducive to absorbing some stress through the deformation of the recess in the top plate, making the top plate prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use. If the ratio of the size of the recess along the third direction to the size of the top plate along the third direction is too large, the manufacturing difficulty is too high, and the top plate is also prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use.

[0016] In the above scheme, by setting the ratio of the size of the recess along the third direction to the size of the top plate along the third direction to be greater than or equal to 90%, the recess has a larger size in the third direction, and the top plate has a larger pre-deformation area in the third direction. This facilitates the absorption of some stress through the deformation of the recess in the top plate, and further reduces the bulging phenomenon or the bulging amplitude of the top plate to a certain extent when it is affected by bending moment or stress during use and bulges along the first direction away from the battery cell. By setting the ratio of the size of the recess along the third direction to the size of the top plate along the third direction to be less than 100%, the space occupied by the recess of the top plate in the direction towards the battery cell is reduced, and the processing and manufacturing difficulty is lower.

[0017] According to some embodiments of this application, a protrusion corresponding to the recess is formed on the side of the top plate facing the battery cell, and the protrusion includes a second arc-shaped wall surface.

[0018] In the above scheme, the convex part allows the thickness of the top plate to be equal at any position in the area where the concave part is located. The convex part can deform towards the side away from the battery cell to absorb some stress. Furthermore, when the top plate is affected by bending moment or stress during use and bulges in the direction away from the battery cell along the first direction, the bulging phenomenon or bulging range of the top plate can be reduced to a certain extent. At the same time, the degree of concavity on the side of the top plate away from the battery cell is reduced, making it easier to adjust the flatness of the side of the top plate away from the battery cell.

[0019] According to some embodiments of this application, along the first direction, the maximum depth of the recess is H1, the thickness of the top plate is T, H1 and T satisfy 0.07≤T / H1≤5, and T satisfies 0.7mm≤T≤5mm, and H1 satisfies 1mm≤H1≤10mm.

[0020] If the maximum depth of the recess along the first direction is too small, the degree of deformation of the recess will be too small, which is not conducive to absorbing some of the stress through the deformation of the recess in the top plate. As a result, when the top plate is subjected to bending moment or stress during use and bulges in the direction away from the battery cell, the bulge will be larger. If the maximum depth of the recess along the first direction is too large, when the top plate is subjected to bending moment or stress during use and deforms in the direction away from the battery cell along the first direction, a large recessed area is likely to exist on the side of the top plate away from the battery cell. This makes it easy for liquids, dust and other impurities to accumulate on the side of the top plate away from the battery cell.

[0021] If the thickness of the top plate is too small, the strength of the top plate will be too low, and the top plate will be easily deformed under stress; if the thickness of the top plate is too large, it will be not conducive to the pre-deformation of the top plate to form a concave part.

[0022] The thinner the top plate, the easier it is to deform, and the greater the degree of stress absorption required in the concave part; conversely, the thicker the top plate, the less likely it is to deform, and the less the degree of stress absorption required in the concave part.

[0023] In the above scheme, the smaller the thickness of the top plate, the greater the degree of stress absorption required by the recess. By setting the ratio of the top plate thickness to the maximum depth of the recess along the first direction to be greater than or equal to 0.07, while satisfying the deformation resistance of the top plate, a recess of greater depth is pre-deformed on the top plate. When the top plate is affected by bending moment or stress during use and bulges along the first direction away from the battery cell, the deformation of the recess absorbs part of the stress, thereby reducing the bulging phenomenon or the bulging amplitude of the top plate and improving the flatness of the side of the top plate away from the battery cell. Conversely, the larger the thickness of the top plate, the smaller the degree of stress absorption required by the recess. By setting the ratio of the top plate thickness to the maximum depth of the recess along the first direction to be greater than, less than, or equal to 5, the top plate has a certain deformation resistance. A recess of smaller depth is pre-deformed on the top plate. When the top plate is affected by bending moment or stress during use and bulges along the first direction away from the battery cell, the deformation of the recess absorbs part of the stress, thereby reducing the bulging phenomenon or the bulging amplitude of the top plate and improving the flatness of the side of the top plate away from the battery cell.

[0024] By setting the thickness of the top plate to be greater than or equal to 0.7 mm, the top plate has a certain strength; by setting the thickness of the top plate to be less than or equal to 5 mm, it is convenient for the top plate to be pre-deformed and a concave part is formed on the side of the top plate away from the battery cell.

[0025] By setting the maximum depth of the recess along the first direction to be greater than or equal to 1 mm, the deformation of the recess in the top plate can absorb some of the stress. This reduces the bulging phenomenon or the extent of bulging when the top plate is subjected to bending moment or stress and bulges in the direction away from the battery cell along the first direction during use. By setting the maximum depth of the recess along the first direction to be less than or equal to 10 mm, the degree of indentation on the side of the top plate away from the battery cell can be weakened after the top plate is subjected to bending moment or stress and deforms in the direction away from the battery cell during use. This reduces the risk of liquid, dust and other impurities accumulating on the side of the top plate away from the battery cell.

[0026] According to some embodiments of this application, H1 and T satisfy 0.1≤T / H1≤2, and T satisfies 0.8mm≤T≤4mm, and H1 satisfies 2mm≤H1≤8mm.

[0027] In the above scheme, by setting the ratio of the thickness of the top plate to the maximum depth of the recess along the first direction to be greater than or equal to 0.1, and further, while satisfying the deformation resistance of the top plate, a recess of greater depth is pre-deformed on the top plate to form a recess of greater depth. When the top plate is subjected to bending moment or stress during use and bulges along the first direction away from the battery cell, the deformation of the recess absorbs part of the stress, thereby reducing the bulging phenomenon or the bulging amplitude of the top plate and improving the flatness of the side of the top plate away from the battery cell. By setting the ratio of the thickness of the top plate to the maximum depth of the recess along the first direction to be less than or equal to 2, the top plate has a certain deformation resistance. Furthermore, a recess of less depth is pre-deformed on the top plate. When the top plate is subjected to bending moment or stress during use and bulges along the first direction away from the battery cell, the deformation of the recess absorbs part of the stress, thereby reducing the bulging phenomenon or the bulging amplitude of the top plate and improving the flatness of the side of the top plate away from the battery cell.

[0028] By setting the thickness of the top plate to be greater than or equal to 0.8 mm and less than or equal to 4 mm, the top plate can be pre-deformed to form a concave portion while ensuring that it has a certain strength.

[0029] By setting the maximum depth of the recess along the first direction to be greater than or equal to 2 mm and less than or equal to 8 mm, while satisfying the stress release of the recess deformation of the top plate, the degree of depression on the side of the top plate away from the battery cell can be reduced after the top plate is affected by bending moment or stress during use and deforms along the first direction away from the battery cell. This reduces the risk of liquid, dust and other impurities accumulating on the side of the top plate away from the battery cell.

[0030] According to some embodiments of this application, the depth of the recess gradually decreases from the center of the first arc-shaped wall to any edge of the first arc-shaped wall.

[0031] In the above scheme, in any direction, the concave part has the greatest depth at the center of the first arc-shaped wall, which is conducive to the deformation of the top plate under stress and facilitates the adjustment of the flatness of the top plate on the side away from the battery cell.

[0032] According to some embodiments of this application, along the first direction, the maximum depth of the recess is H1, the elastic modulus of the top plate is E, H1 and E satisfy 0.001mm / GPa≤H1 / E≤10mm / GPa, and H1 satisfies 1mm≤H1≤10mm, and E satisfies 1GPa≤E≤1000GPa.

[0033] If the maximum depth of the recess along the first direction is too small, the degree of deformation of the recess will be too small, which is not conducive to absorbing some of the stress through the deformation of the recess in the top plate. This makes the top plate prone to bulging in the direction away from the battery cell when subjected to bending moment or stress during use. If the maximum depth of the recess along the first direction is too large, after the top plate is subjected to bending moment or stress during use and deforms in the direction away from the battery cell along the first direction, a large recessed area is likely to exist on the side of the top plate away from the battery cell. This makes it easy for liquid, dust and other impurities to accumulate on the side of the top plate away from the battery cell.

[0034] If the elastic modulus of the top plate is too small, its resistance to deformation is too weak, resulting in a large bulge when the top plate bulges in the direction away from the battery cell under the influence of bending moment or stress during use. If the elastic modulus of the top plate is too large, its resistance to deformation is too high, which is not conducive to the pre-deformation of the top plate to form a concave portion.

[0035] In the above scheme, the smaller the elastic modulus of the top plate, the greater the maximum depth of the pre-deformed recess needs to be, so that some stress can be absorbed by the deformation of the recess. By setting the ratio of the maximum depth of the recess along the first direction to the elastic modulus of the top plate to be greater than or equal to 0.001 mm / GPa and less than or equal to 10 mm / GPa, under the condition that the top plate has a certain resistance to deformation, a recess of a certain depth can be formed by pre-deformation on the top plate. When the top plate is affected by bending moment or stress during use and bulges in the direction away from the battery cell along the first direction, some stress is absorbed by the deformation of the recess, so as to reduce the bulging phenomenon or bulging amplitude of the top plate and improve the flatness of the side of the top plate away from the battery cell.

[0036] By setting the maximum depth of the recess along the first direction to be greater than or equal to 1 mm, the deformation of the recess in the top plate can absorb stress, thus reducing the bulging phenomenon or the extent of bulging when the top plate is affected by bending moment or stress and bulges in the direction away from the battery cell along the first direction during use. By setting the maximum depth of the recess along the first direction to be less than or equal to 10 mm, the degree of indentation on the side of the top plate away from the battery cell can be weakened after the top plate is affected by bending moment or stress and deforms in the direction away from the battery cell along the first direction during use, reducing the risk of liquid, dust and other impurities accumulating on the side of the top plate away from the battery cell.

[0037] By setting the elastic modulus of the top plate to be greater than 1 GPa, the top plate has better resistance to deformation. This reduces the bulging phenomenon or the bulging amplitude of the top plate when it is subjected to bending moment or stress during use and bulges in the direction away from the battery cell along the first direction. By setting the elastic modulus of the top plate to be less than or equal to 1000 GPa, it is easier for the top plate to pre-deform and form a concave part on the side of the top plate away from the battery cell.

[0038] According to some embodiments of this application, H1 and E satisfy 0.2mm / GPa≤H1 / E≤8mm / GPa, and H1 satisfies 2mm≤H1≤8mm, and E satisfies 1GPa≤E≤10GPa.

[0039] In the above scheme, when E satisfies 1GPa≤E≤10GPa, the material of the top plate can be plastic. By setting the ratio of the maximum depth of the recess along the first direction to the elastic modulus of the top plate to be greater than or equal to 0.2mm / GPa and less than or equal to 8mm / GPa, setting the maximum depth of the recess along the first direction to be greater than or equal to 2mm and less than or equal to 8mm, and setting the elastic modulus of the top plate to be greater than or equal to 1GPa and less than or equal to 10GPa, under the condition that the top plate has a certain resistance to deformation, a recess of a certain depth can be pre-deformed on the top plate. When the top plate is affected by bending moment or stress during use and bulges in the direction away from the battery cell along the first direction, the deformation of the recess absorbs part of the stress, thereby reducing the bulging phenomenon or bulging amplitude of the top plate and improving the flatness of the side of the top plate away from the battery cell.

[0040] According to some embodiments of this application, H1 and E satisfy 0.0067 mm / GPa.

[0041] In the above scheme, when E satisfies 100GPa≤E≤300GPa, the material of the top plate can be metal, such as an alloy. By setting the ratio of the maximum depth of the recess along the first direction to the elastic modulus of the top plate to be greater than or equal to 0.0067mm / GPa and less than or equal to 0.08mm / GPa, setting the maximum depth of the recess along the first direction to be greater than or equal to 2mm and less than or equal to 8mm, and setting the elastic modulus of the top plate to be greater than or equal to 100GPa and less than or equal to 300GPa, and further satisfying the condition that the top plate has a certain resistance to deformation, a recess of a certain depth can be pre-deformed on the top plate. When the top plate is affected by bending moment or stress during use and bulges in the direction away from the battery cell along the first direction, the deformation of the recess absorbs part of the stress, so as to reduce the bulging phenomenon or bulging amplitude of the top plate and improve the flatness of the side of the top plate away from the battery cell.

[0042] According to some embodiments of this application, the top plate is made of plastic, resin fiber composite material, or alloy.

[0043] ​In the above scheme, plastic has a certain strength and is lightweight, which can reduce the overall weight of the battery device and has a low manufacturing cost; resin fiber composite material has high strength and is not easily damaged; alloy has high impact and pressure resistance, reducing the risk of damage to the top plate.

[0044] According to some embodiments of this application, the dimension of the top plate along the second direction is L2, and the dimension of the top plate along the third direction is W2, satisfying that 1≤L2 / W2≤8.

[0045] If the ratio of the top plate's dimension along the second direction to its dimension along the third direction is too small, the size of the recess in the second direction will be too small. This will hinder the absorption of stress through deformation of the top plate's recess, making the top plate prone to bulging in the direction away from the battery cell under bending moment or stress during use. If the ratio of the top plate's dimension along the second direction to its dimension along the third direction is too large, the top plate's compressive strength will be too low, making it more susceptible to deformation under stress.

[0046] In the above scheme, by setting the ratio of the size of the top plate along the second direction to the size of the top plate along the third direction to be greater than or equal to 1, the recess can be set with a larger size in the second direction. This can reduce the bulging phenomenon or the bulging amplitude of the top plate to a certain extent when it is affected by bending moment or stress during use and bulges along the first direction away from the battery cell. By setting the ratio of the size of the top plate along the second direction to the size of the top plate along the third direction to be less than or equal to 8, the top plate has higher compressive strength. This can reduce the bulging phenomenon or the bulging amplitude of the top plate to a certain extent when it is affected by bending moment or stress during use and bulges along the first direction away from the battery cell.

[0047] According to some embodiments of this application, the top plate and the second side wall plate are integrally formed.

[0048] In the above scheme, by setting the top plate and the second side wall plate of the second box body as an integrally formed structure, the connection stability and reliability between the top plate and the second side wall plate are improved, which helps to improve the overall structural strength of the second box body.

[0049] According to some embodiments of this application, the first box body includes two first sidewalls arranged opposite each other along a third direction, and the second box body includes two second sidewalls arranged opposite each other along a third direction, each second sidewall being connected to a first sidewall; wherein, the first box body also includes two third sidewalls arranged opposite each other along a second direction, both third sidewalls being connected to the side of the support plate facing the top plate, the two third sidewalls being located at both ends of the second box body in the second direction, and the top plate and the two second sidewalls being connected to the third sidewalls, the first direction, the second direction and the third direction being perpendicular to each other.

[0050] In the above scheme, the first box body includes two first side wall panels arranged opposite each other along a third direction, and the second box body includes two second side wall panels arranged opposite each other along a third direction. Each second side wall panel is connected to a first side wall panel to realize the mutual connection between the first box body and the second box body on both sides in the third direction. The first box body also includes two third side wall panels at both ends of the top plate arranged at intervals along a second direction. Each third side wall panel is connected to the top plate of the second box body and the two second side wall panels to realize the mutual connection between the first box body and the second box body on both sides in the second direction. This enables the assembly connection between the first box body and the second box body and jointly defines the assembly space for accommodating the battery cells. The structure is simple and easy to assemble.

[0051] According to some embodiments of this application, the second box body is provided with first flange edges at both ends in the second direction, and the first flange edges connect the top plate and the two second side wall plates; wherein, the two ends of the third side wall plate in the third direction and the end of the third side wall plate away from the bearing plate in the first direction are connected to the first flange edges.

[0052] In the above scheme, by setting a first flange edge connecting the top plate and the two second side wall plates on the second box body, and the two ends of the third side wall plate in the third direction and the end of the third side wall plate away from the bearing plate in the first direction are both connected to the first flange edge, the third side wall plate is a structure that is connected to the top plate of the second box body and the two second side wall plates through the first flange edge, thereby reducing the assembly difficulty between the third side wall plate and the second box body.

[0053] According to some embodiments of this application, the first flange edge includes a first segment and two second segments. The first segment is connected to the top plate, and the end of the third sidewall plate away from the bearing plate in a first direction is connected to the first segment. The two second segments are respectively connected to two second sidewall plates, and the two ends of the third sidewall plate in a third direction are respectively connected to the two second segments. The first flange edge also includes an arc segment, and each second segment is connected to the first segment through an arc segment.

[0054] In the above solution, by connecting the first section where the first flange edge connects to the top plate and the second section where the first flange edge connects to the second side wall plate with an arc segment, the area where the first flange edge connects to the top plate and the area where the first flange edge connects to the second side wall plate is a structure with an arc transition. This reduces the occurrence of sharp corners at the connection position of the first flange edge at the top plate and the second side wall plate. On the one hand, it facilitates the assembly and connection between the first flange edge and the third side wall plate, which helps to reduce the assembly difficulty between the first flange edge and the third side wall plate. On the other hand, it can alleviate the stress concentration phenomenon at the connection position of the first flange edge at the top plate and the second side wall plate, thereby reducing the risk of damage or cracking of the first flange edge during use.

[0055] According to some embodiments of this application, the first segment and the top plate are connected by a connecting portion; the top plate has a first inner surface facing the support plate in a first direction, the first segment has a second inner surface facing the support plate in a first direction, the second inner surface abuts against the third side wall plate, and the second inner surface and the first inner surface are connected by the inner surface of the connecting portion; wherein, along the first direction, the first inner surface is further away from the support plate than the second inner surface.

[0056] In the above scheme, the first section of the first flange edge and the top plate are connected to each other through a connecting part, and the first inner surface of the top plate is further away from the bearing plate in the first direction than the second inner surface of the first section. This ensures that the arc section and other structures of the first flange edge do not excessively affect the shape of the top plate and the second side wall plate. As a result, the side of the second box body facing the battery cell and the position corresponding to the top plate are recessed in the first direction away from the battery cell. This allows the second box body to be assembled and connected to the third side wall plate of the first box body through the first flange edge, and also increases the volume of the assembly space jointly defined by the first box body and the second box body. This reduces the assembly difficulty of the second box body and the third side wall plate of the first box body while increasing the internal space of the battery device for accommodating the battery cells.

[0057] According to some embodiments of this application, the thickness of the first segment is greater than the thickness of the top plate.

[0058] In the above scheme, the thickness of the first section is greater than that of the top plate, and the first section has higher strength, which facilitates a firm connection between the first section and the third side wall panel.

[0059] According to some embodiments of this application, along the second direction, the dimension of the first flange edge is L3, which satisfies 20mm≤L3≤35mm.

[0060] If the dimension of the first flange edge along the second direction is too small, the connection area between the first flange edge and the third sidewall plate will be too small, and the connection reliability between the first flange edge and the third sidewall plate will be too low; if the dimension of the first flange edge along the second direction is too large, it will occupy too much assembly space and affect the energy density of the battery device.

[0061] In the above scheme, by setting the dimension of the first flange edge along the second direction to be greater than or equal to 20mm, a larger connection area is provided between the first flange edge and the third side wall plate, which facilitates the improvement of the connection reliability between the first flange edge and the third side wall plate; by setting the dimension of the first flange edge along the second direction to be less than or equal to 35mm, while ensuring a large connection area between the first flange edge and the third side wall plate, the space occupied by the first flange edge is reduced, so that the battery device has a higher energy density.

[0062] According to some embodiments of this application, 22mm≤L3≤28mm.

[0063] In the above scheme, by setting the dimension of the first flange edge along the second direction to be greater than or equal to 22mm, a larger connection area is further provided between the first flange edge and the third side wall plate, which facilitates the improvement of the connection reliability between the first flange edge and the third side wall plate; by setting the dimension of the first flange edge along the second direction to be less than or equal to 28mm, while ensuring a large connection area between the first flange edge and the third side wall plate, the space occupied by the first flange edge is further reduced, so that the battery device has a higher energy density.

[0064] According to some embodiments of this application, the second sidewall panel has a second flange edge connected to the first sidewall panel at the end away from the top plate in the first direction, and the second flange edge of each second sidewall panel is connected to two first flange edges at both ends in the second direction.

[0065] In the above scheme, by connecting the two ends of the second flange edge of the second side wall plate in the second direction to the two first flange edges located at the two ends of the top plate in the second direction, the second flange edge and the first flange edge of the second box body used for assembly and connection with the first box body are formed into an integral structure, thereby improving the overall structural strength of the second box body and effectively improving the assembly reliability between the second box body and the first box body.

[0066] According to some embodiments of this application, the battery device further includes a first seal disposed between the first flange edge and the third sidewall plate to seal the gap between the first flange edge and the third sidewall plate.

[0067] In the above solution, by setting a first sealing element between the first flange edge and the third side wall plate, the first sealing element can seal the gap between the first flange edge and the third side wall plate, which helps to improve the sealing performance of the assembly space jointly defined by the first box body and the second box body. This reduces the risk of water vapor or liquid impurities entering the assembly space from the gap between the first flange edge and the third side wall plate during use, thereby improving the reliability and service life of the battery device.

[0068] According to some embodiments of this application, the end of the second sidewall panel away from the top plate in a first direction is formed with a second flange edge connected to the first sidewall panel. The thickness direction of the second flange edge is parallel to the third direction, and the second flange edge and the first sidewall panel are stacked along the third direction.

[0069] In the above scheme, by setting the second flange edge of the second side wall plate for interconnection with the first side wall plate as a structure stacked with the first side wall plate along a third direction, the stacking direction of the second flange edge and the first side wall plate is consistent with the thickness direction of the second flange edge and the same as the arrangement direction of the two first side wall plates. This facilitates the stacking and connection of the two second side wall plates with the two first side wall plates along a third direction, which helps to reduce the assembly difficulty between the first side wall plate and the second side wall plate and improves the assembly stability between the first side wall plate and the second side wall plate.

[0070] According to some embodiments of this application, along a third direction, the first sidewall is located on the side of the second flange facing the assembly space.

[0071] In the above scheme, by setting the first side wall panel to be located on the side of the second flange facing the assembly space in the third direction, the two first side wall panels of the first box body are located between the two second side wall panels in the third direction, so that the second side wall panel with a larger size in the first direction is located outside the two first side wall panels in the third direction. This makes it easier for the second side wall panel to cover the first side wall panel and helps to reduce the assembly difficulty between the first side wall panel and the second side wall panel.

[0072] According to some embodiments of this application, the first sidewall panel and the load-bearing plate are separately disposed but connected.

[0073] In the above solution, by setting the first side wall panel and the support plate as separate structures, on the one hand, it can reduce the difficulty of setting the first side wall panel on both sides of the support plate along the third direction, thereby reducing the manufacturing difficulty of the first box body. On the other hand, it can adjust the position of the first side wall panel in the first direction according to the actual situation, thereby adjusting the size of the first side wall panel protruding from the support surface of the support plate in the first direction, which is beneficial to improving the applicability of the first box body.

[0074] According to some embodiments of this application, the third sidewall panel is detachably connected to the support plate.

[0075] In the above solution, by setting the third side wall panel to be detachably connected to the support plate, different third side wall panels can be replaced according to different usage requirements, and it is also convenient to maintain and repair the first box body in the future, which helps to reduce the later use cost of the battery device.

[0076] According to some embodiments of this application, the first box body further includes a reinforcing member, which is disposed on the side of the bearing plate facing the top plate. The reinforcing member extends along a third direction, and the two ends of the reinforcing member in the third direction are respectively connected to two first side wall plates.

[0077] In the above scheme, by setting a reinforcing member on the side of the bearing plate facing the top plate, and the reinforcing member extending along the third direction and connecting with both first side wall plates, the two first side wall plates located on both sides of the bearing plate in the third direction can be further reinforced and strengthened by the reinforcing member, which is beneficial to improving the overall structural strength of the first box body.

[0078] According to some embodiments of this application, the first box body includes two reinforcing members, which are arranged at intervals along a second direction, and a battery cell is disposed between the two reinforcing members along the second direction.

[0079] In the above scheme, by setting two reinforcing members on the support plate, and the two reinforcing members are arranged at intervals along the second direction on both sides of all battery cells, the battery device with this structure can, on the one hand, realize the connection between the two reinforcing members and the two first side wall panels to form an integral frame structure, which is conducive to further improving the overall structural strength of the first box body. On the other hand, the two reinforcing members can also play a certain limiting role in the second direction for the battery cells placed on the support plate, so as to reduce the risk of the battery cells shaking or shifting along the second direction during use.

[0080] According to some embodiments of this application, the first box body includes a plurality of first side wall panels, which surround the bearing plate and are connected end to end in sequence; wherein, the second box body includes a plurality of second side wall panels, which surround the top plate and are connected end to end in sequence, and each second side wall panel is connected to a first side wall panel.

[0081] In the above scheme, the first box body is provided with a plurality of first side wall panels surrounding the support plate, and correspondingly, the second box body is provided with a plurality of second side wall panels surrounding the top plate, and each second side wall panel is connected to a first side wall panel, so that the first box body and the second box body are both structures that are open on one side and cover each other, thereby realizing the assembly connection between the first box body and the second box body and jointly defining the assembly space for accommodating the battery cell. The structure is simple and easy to implement.

[0082] According to some embodiments of this application, the end of the second sidewall panel away from the top plate in the first direction is formed with a second flange edge connected to the first sidewall panel. The thickness direction of the second flange edge is parallel to the first direction, and the second flange edge and the first sidewall panel are stacked along the first direction.

[0083] In the above scheme, by setting the second flange edge of the second side panel for interconnection with the first side panel as a structure that is stacked with the first side panel along the first direction, the stacking direction of the second flange edge and the first side panel is consistent with the thickness direction of the second flange edge and the same as the closing direction of the first box body and the second box body. This facilitates the stacking and connection of the second flange edge and the first side panel, which helps to reduce the assembly difficulty between the first side panel and the second side panel and improves the connection reliability between the first side panel and the second side panel.

[0084] According to some embodiments of this application, the second flange edges of a plurality of second sidewall plates are connected end to end in sequence.

[0085] In the above scheme, by setting the second flange edges of multiple second side wall panels to be connected end to end, the second flange edges of multiple second side wall panels form an integral structure and a ring structure extending circumferentially along the top plate. This not only improves the overall structural strength of the second box body, but also effectively improves the assembly reliability between the second box body and the first box body.

[0086] According to some embodiments of this application, the first sidewall panel includes a panel body and a flange portion. The panel body is connected to the bearing plate and protrudes from the bearing surface. The flange portion is connected to the end of the panel body away from the bearing plate, and the thickness direction of the flange portion is parallel to the first direction. The flange portion and the edge of the second flange are stacked and connected along the first direction.

[0087] In the above solution, the first side wall panel includes a plate body and a flange portion that are connected to each other. The plate body is connected to the bearing plate and protrudes from the bearing surface, and the thickness direction of the flange portion is parallel to the first direction, so that the cross-section of the first side wall panel is a bent "L" shaped structure. By setting the flange portion of the first side wall panel in a structure that is stacked and connected to the second flange edge along the first direction, the assembly difficulty between the first box body and the second box body can be reduced, and the contact area between the first box body and the second box body can be increased to improve the connection stability between the first box body and the second box body.

[0088] According to some embodiments of this application, the first sidewall panel and the load-bearing plate are integrally formed.

[0089] In the above solution, by setting the first side wall panel as an integrally formed structure with the support plate, on the one hand, the connection stability and reliability between the first side wall panel and the support plate can be improved, which helps to reduce the risk of the first side wall panel and the support plate separating during use, thereby improving the reliability of the first box body. On the other hand, it can reduce the difficulty of setting multiple first side wall panels around the support plate, thereby reducing the molding difficulty of the first box body.

[0090] According to some embodiments of this application, the battery device further includes a buffer disposed between the second sidewall panel and the battery cell.

[0091] In the above solution, by setting a buffer between the second side wall panel and the battery cell, the buffer can absorb at least a portion of the stress generated on the first box body as it is transmitted to the top plate through the second side wall panel. This reduces the stress on the top plate, alleviates deformation or bulging of the top plate of the second box body during use, extends the service life of the battery device, reduces safety hazards during use, and improves the service life and reliability of the battery device.

[0092] According to some embodiments of this application, the buffer is supported between the second sidewall panel and the battery cell, and the second sidewall panel bulges in the direction away from the battery cell.

[0093] In the above solution, by setting the buffer component as a structure that supports the second side wall panel and the battery cell and lifts the second side wall panel away from the battery cell, the buffer component can better absorb the stress on the second side wall panel, and the second side wall panel is a pre-deformed structure so that at least part of the stress can be released on the second side wall panel, thereby further reducing the stress on the top plate and further alleviating the deformation or bulging of the top plate of the second box body during use.

[0094] According to some embodiments of this application, the top plate is provided with a reinforcing portion, which is configured to enhance the bending strength of the top plate.

[0095] In the above solution, by providing a reinforcing part on the top plate of the second box body, and the reinforcing part can enhance the bending strength of the top plate, the top plate of the second box body is a structure in which the bending strength of at least a part of the area is enhanced. The second box body with this structure can enhance the ability of the top plate of the second box body to resist the stress transmitted to the second box body by the first box body, thereby effectively alleviating the deformation or bulging of the top plate of the second box body caused by stress during use, which is conducive to extending the service life of the battery device, reducing the safety hazards of the battery device during use, and improving the service life and reliability of the battery device.

[0096] According to some embodiments of this application, along a first direction, a reinforcing portion protrudes from the surface of one side of the top plate.

[0097] In the above scheme, by protruding a reinforcing part on one side of the top plate along the first direction, the area of ​​the top plate with the protruding reinforcing part is a region with enhanced bending strength. The structure is simple and easy to implement.

[0098] According to some embodiments of this application, the interior of the carrier plate has flow channels for containing heat exchange medium, and the carrier plate is also configured to manage the temperature of the battery cells.

[0099] In the above scheme, by setting a flow channel inside the support plate to accommodate the heat exchange medium, the support plate also has the function of heat exchange with the battery cells. Thus, the support plate can not only support the battery cells, but also manage the temperature of the battery cells during use. The components for managing the temperature of the battery cells are integrated into the support plate, thereby improving the internal space utilization of the battery device while managing the temperature of the battery cells. This is beneficial to improving the reliability of the battery device while taking into account the volumetric energy density of the battery device.

[0100] According to some embodiments of this application, the battery device further includes a heat-conducting element disposed between the bearing surface and the battery cell along a first direction.

[0101] In the above scheme, by setting a heat-conducting component between the battery cell and the bearing surface of the carrier plate, the heat-conducting component can improve the heat transfer efficiency between the battery cell and the carrier plate, thereby improving the carrier plate's effect on managing the temperature of the battery cell.

[0102] Secondly, embodiments of this application also provide an electrical device, which includes a battery device according to any of the above embodiments, the battery device being used to provide electrical energy.

[0103] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0104] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0105] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0106] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0107] Figure 3Exploded views of the structure of the battery device provided in some embodiments of this application;

[0108] Figure 4 This is a schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application;

[0109] Figure 5 This is a schematic diagram of the structure of the first housing body of the battery device provided in some embodiments of this application;

[0110] Figure 6 Cross-sectional views of a battery device provided for some embodiments of this application;

[0111] Figure 7 for Figure 6 A partial enlarged view of point A of the battery device shown;

[0112] Figure 8 A cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to the second direction;

[0113] Figure 9 for Figure 8 A magnified view of part B of the second box body shown;

[0114] Figure 10 Cross-sectional views of the battery device provided for some embodiments of this application in other embodiments;

[0115] Figure 11 for Figure 10 A partial enlarged view of point C of the battery device shown;

[0116] Figure 12 Schematic diagrams of the structure of the battery device provided in some embodiments of this application;

[0117] Figure 13 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0118] Figure 14 A schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application;

[0119] Figure 15 A schematic diagram of the structure of the first housing body of the battery device provided in some embodiments of this application;

[0120] Figure 16 A cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to the second direction;

[0121] Figure 17 A cross-sectional view of the first housing body of a battery device provided in some embodiments of this application, perpendicular to a second direction;

[0122] Figure 18 for Figure 17 A magnified view of point D on the first box body shown;

[0123] Figure 19 A cross-sectional view of the second housing body of a battery device provided in some further embodiments of this application, perpendicular to a second direction.

[0124] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Battery Cell; 20 - First Box Body; 21 - Support Plate; 211 - Support Surface; 212 - Flow Channel; 22 - First Side Wall Panel; 221 - Docking Part; 222 - Limiting Part; 223 - Plate Body; 224 - Flanged Part; 23 - Third Side Wall Panel; 24 - Reinforcing Member; 30 - Second Box Body; 31 - Top Plate; 311 - Recess; 311a - First Arc-shaped Wall Surface; 312 - Protrusion; 312a - Second Arc-shaped Wall Surface; 313 - First Inner Surface; 314 - Reinforcing Member ; 315 - Edge; 32 - Second sidewall panel; 321 - Body part; 322 - Second flange edge; 3221 - Abutment part; 33 - First flange edge; 331 - First section; 3311 - Second inner surface; 332 - Second section; 333 - Arc segment; 34 - Connecting part; 40 - Housing; 40a - Assembly space; 50 - First locking element; 60 - Second sealing element; 70 - Second locking element; 80 - Buffer element; 90 - Heat conducting element; 200 - Controller; 300 - Motor; X - First direction; Y - Third direction; Z - Second direction. Detailed Implementation

[0125] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0126] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0127] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0128] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0129] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0130] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0131] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0132] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0133] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0134] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0135] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0136] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0137] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0138] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0139] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0140] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0141] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0142] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0143] For a typical battery pack, it includes a housing and multiple battery cells housed within the housing. The housing comprises a first housing body and a second housing body, which are interconnected to form an assembly space for accommodating the battery cells. During the use of the battery pack, the first housing body is typically mounted onto a corresponding mounting bracket. For example, in electric vehicles, a mounting structure is usually installed on the first housing body, which is used for assembly and connection with the vehicle's load-bearing beam to achieve battery pack assembly. However, due to issues such as dimensional differences or flatness differences between the mounting points of the battery pack and the mounting bracket, and due to the usage environment of the battery pack... The complex environment causes the fasteners to exert a large torque on the first housing body, especially in structures where the height of the first housing body is smaller than that of the second housing body. This results in a weaker binding force between the first and second housing bodies and lower structural strength of the first housing body. Consequently, the first housing body is prone to deformation, and the stress generated by this deformation is transmitted to the top plate of the second housing body. This can lead to deformation or bulging of the top plate of the second housing body, resulting in a shorter lifespan for the battery housing and significant safety hazards during use. Ultimately, this hinders the improvement of the battery's lifespan and reliability.

[0144] Based on the above considerations, in order to solve the problems of short service life and low reliability of battery devices, this application provides a battery device including a battery cell, a first housing body, and a second housing body. The first housing body is provided with a mounting structure, including a support plate and a first side wall plate. The support plate has a support surface on one side in a first direction, which is used to support the battery cell along the first direction. The first side wall plate is connected to the support plate and protrudes from the support surface. The second housing body and the first housing body together define an assembly space for accommodating the battery cell. The second housing body includes a top plate and a second side wall plate. The top plate and the support plate are arranged opposite to each other along the first direction. The second side wall plate is connected to the first side wall plate, and the end of the second side wall plate away from the support plate in the first direction is connected to the top plate. Along the first direction, the size of the first side wall plate protruding from the support surface is less than one-quarter of the maximum size of the second side wall plate. A recess is formed on the side of the top plate away from the battery cell, and the recess includes a first arc-shaped wall surface.

[0145] In this battery device structure, the battery device includes a first housing body and a second housing body. A first side wall plate of the first housing body and a second side wall plate of the second housing body are connected to each other. The first housing body is provided with a mounting structure for assembly and connection with a target component. This facilitates the support and bearing of the battery cells by the support plate of the first housing body, and makes it easy to assemble the battery device onto the target component for power supply. By making the dimension of the first side wall plate protruding from the support surface less than one-quarter of the maximum dimension of the second side wall plate, the size of the first side wall plate used for assembly and connection with the second housing body is reduced. This optimizes the dimensions of the first housing body in the first direction and reduces the binding force of the first housing body on the second housing body, thereby reducing the tension between the first housing body and the target component. This reduces the assembly difficulty of the battery pack and the difficulty of assembling individual battery cells onto the support plate, thereby reducing the assembly difficulty of the battery pack. Specifically, at least a portion of the top plate is bulging towards the battery cells, while the side of the top plate facing away from the battery cells in a first direction is recessed towards the battery cells, forming a pre-deformed recess. The recess includes a first arc-shaped wall surface, which can evenly distribute stress, reducing the risk of localized stress concentration. Simultaneously, the first arc-shaped wall surface can convert some external pressure into internal compressive stress during stress, absorbing some stress through deformation. Therefore, when the top plate is subjected to bending moment or stress during use and bulges along the first direction away from the battery cells, the bulging phenomenon or bulging amplitude of the top plate can be reduced to a certain extent.

[0146] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0147] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0148] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0149] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0150] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0151] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0152] Please see Figures 2 to 9 , Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application. Figure 3 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the first housing body of the battery device provided in some embodiments of this application. Figure 6 This is a cross-sectional view of a battery device provided in some embodiments of this application. Figure 7 for Figure 6 A partial enlarged view of point A of the battery device shown. Figure 8 A cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to the second direction. Figure 9 for Figure 8The image shows a partial enlarged view of point B on the second housing body. This application provides a battery device 100, which includes a battery cell 10, a first housing body 20, and a second housing body 30. The first housing body 20 is provided with a mounting structure, including a support plate 21 and a first side wall plate 22. The support plate 21 has a support surface 211 on one side in the first direction X, which supports the battery cell 10 along the first direction X. The first side wall plate 22 is connected to the support plate 21 and protrudes from the support surface 211. The second housing body 30 and the first housing body 20 together define an assembly space 40a for accommodating the battery cell 10. The second housing body 30 includes a top plate 31 and a second side wall plate 32. The top plate 31 and the support plate 21 are arranged opposite each other along a first direction X. The second side wall plate 32 is connected to the first side wall plate 22, and the end of the second side wall plate 32 away from the support plate 21 in the first direction X is connected to the top plate 31. Along the first direction X, the dimension of the first side wall plate 22 protruding from the support surface 211 is less than one-quarter of the maximum dimension of the second side wall plate 32. A recess 311 is formed on the side of the top plate 31 opposite to the battery cell 10, and the recess 311 includes a first arc-shaped wall surface 311a.

[0153] The first box body 20 is provided with a mounting structure, which can be a threaded hole, bolt or locking mechanism, etc., provided on the first box body 20. Multiple mounting structures are provided on the first box body 20 to fix the first box body 20 to the target part through the mounting structure, thereby realizing the assembly of the battery device 100 onto the target part. The specific structure of the mounting structure can be found in the relevant technology, and will not be described in detail here.

[0154] The first housing body 20 and the second housing body 30 of the battery device 100 together define an assembly space 40a for accommodating the battery cell 10, such that the first housing body 20 and the second housing body 30 together form the housing 40 of the battery device 100, and the housing 40 provides the assembly space 40a for the battery cell 10. Optionally, the housing 40 formed by the first housing body 20 and the second housing body 30 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of the box 40 formed by the first box body 20 and the second box body 30 is a cuboid. Correspondingly, the height direction of the box 40 is the first direction X, the width direction of the box 40 is the second direction Z, and the length direction of the box 40 is the third direction Y.

[0155] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 40. When there are multiple battery cells 10 disposed within the housing 40, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 40. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 40.

[0156] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0157] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 10 is in the shape of a cuboid.

[0158] The support plate 21 has a support surface 211 on one side in the first direction X. The support surface 211 is used to support the battery cell 10 along the first direction X. That is, the battery cell 10 is placed on the support surface 211 on the side of the support plate 21 facing the assembly space 40a, and the support plate 21 is located at the bottom of the battery cell 10 in the first direction X, so that the support surface 211 of the support plate 21 can support the battery cell 10. Correspondingly, the first direction X is the direction of gravity or a direction approximately equal to the direction of gravity.

[0159] The first side wall panel 22 is connected to the support plate 21 and protrudes from the support surface 211. That is, the first side wall panel 22 of the first box body 20 is connected to the support plate 21 and extends beyond the support surface 211 of the support plate 21 in the first direction X along the direction from the support plate 21 to the battery cell 10.

[0160] The top plate 31 and the support plate 21 are arranged opposite each other along the first direction X, that is, the support plate 21 of the first box body 20 and the top plate 31 of the second box body 30 are arranged at intervals along the first direction X and facing each other.

[0161] The second side wall panel 32 is connected to the first side wall panel 22, and the end of the second side wall panel 32 away from the bearing plate 21 in the first direction X is connected to the top plate 31. That is to say, the second side wall panel 32 is a structure in the second box body 30 that is assembled and connected to the first side wall panel 22 of the first box body 20, and the end of the second side wall panel 32 away from the first side wall panel 22 in the first direction X is connected to the top plate 31, so that the top plate 31 is a structure that is indirectly connected to the first side wall panel 22 through the second side wall panel 32, and the top plate 31 and the first side wall panel 22 are arranged at intervals in the first direction X.

[0162] Along the first direction X, the dimension of the first sidewall panel 22 protruding from the bearing surface 211 is less than one-quarter of the maximum dimension of the second sidewall panel 32, see [reference]. Figure 7 and Figure 8 As shown, the first sidewall panel 22 protrudes from the bearing surface 211 in the first direction X by a dimension D1, and the second sidewall panel 32 has a maximum dimension D2 in the first direction X, that is, D1 < 0.25D2.

[0163] It should be noted that among the multiple side wall panels of the first box body 20, the side wall panel whose size protruding from the bearing surface 211 is less than one-quarter of the maximum size of the second side wall panel 32 is the first side wall panel 22. Correspondingly, the mounting structure can be set on the bearing plate 21 or on the first side wall panel 22.

[0164] For example, in Figure 7 In the structure, the first side wall panel 22 and the support plate 21 are separate components. One end of the support plate 21 in the second direction Z is connected to the first side wall panel 22, and the first side wall panel 22 protrudes along the first direction X from the support surface 211 of the support plate 21 facing the assembly space 40a.

[0165] It should be noted that the materials of the first box body 20 and the second box body 30 can be various. The first box body 20 and the second box body 30 can be non-metallic materials, such as polymer composite materials. Of course, the first box body 20 and the second box body 30 can also be metallic materials, such as aluminum, aluminum alloy, or steel. Similarly, the materials of the first box body 20 and the second box body 30 can be of the same structure or different structures.

[0166] Please see Figure 6 , Figure 8 and Figure 9 As shown, the top plate 31 is at least partially recessed in the first direction X toward the direction of the battery cell 10 and forms a pre-deformed recess 311.

[0167] The first arc-shaped wall surface 311a can be a relatively smooth curved surface, so that the first arc-shaped wall surface 311a can be evenly distributed with force, reducing the risk of local stress concentration; at the same time, the first arc-shaped wall surface 311a can convert part of the external pressure into compressive stress of internal interaction when subjected to force, and absorb part of the stress through deformation.

[0168] The recess 311 is a pre-deformed structure of the top plate 31. When the top plate 31 is affected by bending moment or stress, it can deform in the first direction X toward the direction away from the battery cell 10. It can adjust the flatness of the side of the top plate 31 away from the battery cell 10 and reduce the bulging phenomenon or bulging amplitude of the top plate 31 toward the side away from the battery cell 10.

[0169] When the top plate 31 is made of metal, the recess 311 can be formed by stamping sheet metal. Therefore, the maximum depth of the recess 311 can be greater than the thickness of the top plate 31, and the maximum depth of the recess 311 can also be less than the thickness of the top plate 31.

[0170] When the material of the top plate 31 is non-metallic, such as plastic, the recess 311 can be injection molded from a plastic substrate. The maximum depth of the recess 311 can be greater than the thickness of the top plate 31, or the maximum depth of the recess 311 can be less than the thickness of the top plate 31.

[0171] The junction of the top plate 31 and the second side wall plate 32 forms an edge 315 (see [link]). Figure 4 The edge 315 has high strength and is not easily deformed when the top plate 31 is under stress. The method for determining the edge of the top plate 31 is as follows: the support plate 21 is set horizontally, and the top plate 31 is located above the support plate 21. A plate coated with paint is placed on top of the top plate 31, so that the plate is in contact with the top plate 31. The paint on the plate is applied to the position where the plate and the top plate 31 are in contact, thus obtaining the edge of the top plate 31. The definition of the recess 311: taking the edge of the top plate 31 near the edge 315 as the measurement reference, the support plate 21 is placed on the worktable of the coordinate measuring machine. The height difference between different positions of the top plate 31 and the edge of the top plate 31 near the edge 315 is measured by the coordinate measuring machine. The area where the height difference between the measured value and the edge of the top plate 31 near the edge 315 is greater than or equal to 0.5 mm is defined as the recess 311.

[0172] It should be noted that the contour measurement of the recess 311 can be performed using either a contact measurement method, such as probe detection, or a non-contact measurement method, such as optical measurement.

[0173] In this embodiment, the battery device 100 includes a first housing body 20 and a second housing body 30. The first side wall plate 22 of the first housing body 20 and the second side wall plate 32 of the second housing body 30 are connected to each other. The first housing body 20 is provided with a mounting mechanism for assembly and connection with a target component, so that the support plate 21 of the first housing body 20 can support and carry the battery cell 10, and facilitate the assembly of the battery device 100 onto the target component for power supply. By making the size of the first side wall plate 22 of the first housing body 20 protruding from the support surface 211 less than one-quarter of the maximum size of the second side wall plate 32, the size of the first side wall plate 22 of the first housing body 20 for assembly and connection with the second housing body 30 is smaller. This helps to optimize the size of the first housing body 20 in the first direction X and can reduce the binding force of the first housing body 20 on the second housing body 30, thereby reducing the binding force between the first housing body 20 and the target component. The assembly difficulty between the battery cells 10 and the assembly difficulty of the battery device 100 are reduced. At least a portion of the top plate 31 is configured to bulge towards the battery cell 10, so that the side of the top plate 31 away from the battery cell 10 in the first direction X is recessed towards the battery cell 10 and forms a pre-deformed recess 311. The recess 311 includes a first arc-shaped wall surface 311a. The first arc-shaped wall surface 311a can evenly distribute the force and reduce the risk of local stress concentration. At the same time, the first arc-shaped wall surface 311a can convert part of the external pressure into compressive stress of internal interaction when subjected to force, and absorb part of the stress through deformation. Therefore, when the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 in the first direction X, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent.

[0174] According to some embodiments of this application, on the same projection plane perpendicular to the first direction X, the area of ​​the top plate 31 is S1 and the area of ​​the recess 311 is S2, satisfying that 60% ≤ S1 / S2 < 100%.

[0175] The area of ​​the top plate 31 can be obtained by scanning the top plate 31 with a coordinate measuring machine.

[0176] The area measurement method for the recess 311 is as follows: taking the edge of the top plate 31 near the edge 315 as the measurement reference, the bearing plate 21 is placed on the worktable of the coordinate measuring machine. The height difference between different positions of the top plate 31 and the edge of the top plate 31 near the edge 315 is measured by the coordinate measuring machine. The area where the height difference between the measured value and the edge 315 is greater than or equal to 0.5mm is defined as the recess 311. The contour of the recess 311 is fitted by the coordinate measuring machine, and the area of ​​the recess 311 is calculated.

[0177] If the ratio of the area of ​​the top plate 31 to the area of ​​the recess 311 is too small, the pre-deformation area of ​​the top plate 31 will be too small, which will not be conducive to absorbing some of the stress through the deformation of the recess 311 of the top plate 31. This will make the top plate 31 prone to bulging in the direction away from the battery cell 10 when subjected to bending moment or stress during use. If the ratio of the area of ​​the top plate 31 to the area of ​​the recess 311 is too large, the manufacturing difficulty will be too high, and the top plate 31 will also be prone to bulging in the direction away from the battery cell 10 when subjected to bending moment or stress during use.

[0178] In the above scheme, by setting the ratio of the area of ​​the top plate 31 to the area of ​​the recess 311 to be greater than or equal to 60%, the top plate 31 has a large pre-deformation area, which facilitates the absorption of some stress through the deformation of the recess 311 of the top plate 31. Furthermore, when the top plate 31 is subjected to bending moment or stress during use and bulges along the first direction X in the direction away from the battery cell 10, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent. By setting the ratio of the area of ​​the top plate 31 to the area of ​​the recess 311 to be less than 100%, the occupancy of the assembly space 40a by the recess of the top plate 31 in the direction towards the battery cell 10 is reduced, and the processing and manufacturing difficulty is lower.

[0179] In some embodiments, S1 / S2 can be any one or any two of, but not limited to, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, and 96%.

[0180] According to some embodiments of this application, please refer to Figure 4 Along the second direction Z, the size of the recess 311 is L1, and the size of the top plate 31 is L2, satisfying that 80% ≤ L1 / L2 < 100%. The second direction Z is parallel to the length direction of the battery device 100, and the second direction Z is perpendicular to the first direction X.

[0181] The dimension of the recess 311 along the second direction Z can be obtained using a coordinate measuring machine.

[0182] The dimensions of the top plate 31 along the second direction Z can be obtained using measuring equipment such as a coordinate measuring machine or a laser rangefinder.

[0183] The length direction of the battery device 100 can be parallel to the length direction of the electrical device, that is, the length of the battery device 100 can be the dimension of the battery device 100 in the length direction of the electrical device. For example, when the electrical device is a vehicle, the length direction of the vehicle frame is parallel to the length direction of the battery device 100.

[0184] If the ratio of the dimension of the recess 311 along the second direction Z to the dimension of the top plate 31 along the second direction Z is too small, the dimension of the recess 311 in the second direction Z will be too small, and the pre-deformation area of ​​the top plate 31 in the second direction Z will be too small. This is not conducive to absorbing some stress through the deformation of the recess 311 of the top plate 31, making the top plate 31 prone to bulging in the direction away from the battery cell 10 under the influence of bending moment or stress during use. If the ratio of the dimension of the recess 311 along the second direction Z to the dimension of the top plate 31 along the second direction Z is too large, the manufacturing difficulty will be too high, and the top plate 31 will be prone to bulging in the direction away from the battery cell 10 under the influence of bending moment or stress during use.

[0185] In the above scheme, by setting the ratio of the dimension of the recess 311 along the second direction Z to the dimension of the top plate 31 along the second direction Z to be greater than or equal to 80%, the recess 311 has a larger dimension in the second direction Z, and the top plate 31 has a larger pre-deformation area in the second direction Z. This facilitates the absorption of some stress through the deformation of the recess 311 of the top plate 31. Furthermore, when the top plate 31 is affected by bending moment or stress during use and bulges along the first direction X in the direction away from the battery cell 10, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent. By setting the ratio of the dimension of the recess 311 along the second direction Z to the dimension of the top plate 31 along the second direction Z to be less than 100%, the occupancy of the assembly space 40a by the recess of the top plate 31 in the direction towards the battery cell 10 is reduced, and the processing and manufacturing difficulty is lower.

[0186] In some embodiments, L1 / L2 can be any one or both of 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, and 96%.

[0187] In some embodiments, the top plate 31 is connected to the first side wall plate 22 at both ends in the second direction Z. Therefore, an area for connecting the top plate 31 to the first side wall plate 22 needs to be reserved in the second direction Z. This area does not have a recess 311.

[0188] According to some embodiments of this application, please refer to Figure 8 Along the third direction Y, the size of the recess 311 is W1, and the size of the top plate 31 is W2, satisfying that 90% ≤ W1 / W2 < 100%, the third direction Y is parallel to the width direction of the battery device 100, and the third direction Y is perpendicular to the first direction X.

[0189] The dimension of the recess 311 along the third direction Y can be obtained using a coordinate measuring machine.

[0190] The dimensions of the top plate 31 along the third direction Y can be obtained using measuring equipment such as a coordinate measuring machine or a laser rangefinder.

[0191] The width direction of the battery device 100 can be parallel to the width direction of the electrical device, that is, the width of the battery device 100 can be the dimension of the battery device 100 in the width direction of the electrical device. For example, when the electrical device is a vehicle 1000, the width direction of the vehicle frame of the vehicle 1000 is parallel to the width direction of the battery device 100.

[0192] If the ratio of the dimension of the recess 311 along the third direction Y to the dimension of the top plate 31 along the third direction Y is too small, the dimension of the recess 311 in the third direction Y will be too small, and the pre-deformation area of ​​the top plate 31 in the third direction Y will be too small. This is not conducive to absorbing some stress through the deformation of the recess 311 of the top plate 31, making the top plate 31 prone to bulging in the direction away from the battery cell 10 when subjected to bending moment or stress during use. If the ratio of the dimension of the recess 311 along the third direction Y to the dimension of the top plate 31 along the third direction Y is too large, the manufacturing difficulty will be too high, and the top plate 31 will also be prone to bulging in the direction away from the battery cell 10 when subjected to bending moment or stress during use.

[0193] In the above scheme, by setting the ratio of the dimension of the recess 311 along the third direction Y to the dimension of the top plate 31 along the third direction Y to be greater than or equal to 90%, the recess 311 has a larger dimension in the third direction Y, and the top plate 31 has a larger pre-deformation area in the third direction Y. This facilitates the absorption of some stress through the deformation of the recess 311 of the top plate 31. Furthermore, when the top plate 31 is affected by bending moment or stress during use and bulges along the first direction X in the direction away from the battery cell 10, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent. By setting the ratio of the dimension of the recess 311 along the third direction Y to the dimension of the top plate 31 along the third direction Y to be less than 100%, the occupancy of the assembly space 40a by the recess of the top plate 31 in the direction towards the battery cell 10 is reduced, and the processing and manufacturing difficulty is lower.

[0194] In some embodiments, the top plate 31 is connected to two second sidewall plates 32 at both ends in the third direction Y, and the recess 311 can be provided close to the edge of the top plate 31 in the third direction Y. For example, W1 / W2 can be any one or any two of 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, and 99%.

[0195] According to some embodiments of this application, please refer to Figure 6 , Figure 8 and Figure 9 As shown, a protrusion 312 corresponding to the recess 311 is formed on the side of the top plate 31 facing the battery cell 10, and the protrusion 312 includes a second arcuate wall surface 312a.

[0196] The top plate 31 can be formed with recesses 311 and protrusions 312 by stamping, or the top plate 31 can be formed with recesses 311 and protrusions 312 by injection molding.

[0197] Correspondingly, the second arc-shaped wall surface 312a can be a relatively smooth curved surface, so that the second arc-shaped wall surface 312a can be evenly distributed with force, reducing the risk of local stress concentration.

[0198] In the above scheme, the convex part 312 is provided so that the thickness of the top plate 31 can be equal at any position in the area where the concave part 311 is located. The convex part 312 can deform toward the side away from the battery cell 10 to absorb some stress. Furthermore, when the top plate 31 is affected by bending moment or stress during use and bulges along the first direction X toward the side away from the battery cell 10, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent. At the same time, the degree of concavity of the side of the top plate 31 away from the battery cell 10 is reduced, which makes it easier to adjust the flatness of the side of the top plate 31 away from the battery cell 10.

[0199] According to some embodiments of this application, please refer to Figure 9 As shown, along the first direction X, the maximum depth of the recess 311 is H1, and the thickness of the top plate 31 is T. H1 and T satisfy 0.05≤T / H1≤5, and T satisfies 0.7mm≤T≤5mm, and H1 satisfies 1mm≤H1≤10mm.

[0200] The maximum depth of the recess 311 along the first direction X can be measured by a coordinate measuring machine.

[0201] The thickness of the top plate 31 can be measured by scanning with a CT scanner (Computed Tomography Scanner).

[0202] For example, the thickness of the top plate 31 can be the thickness of the base of the top plate 31, where the base of the top plate 31 refers to the area of ​​the top plate 31 without protrusions, grooves or other structures.

[0203] If the thickness of the top plate 31 is too small, the strength of the top plate 31 will be too low, and the top plate 31 will be easily damaged by stress; if the thickness of the top plate 31 is too large, it will be not conducive to the pre-deformation of the top plate 31 to form the recess 311.

[0204] The smaller the thickness of the top plate 31, the easier it is to deform, and the greater the degree to which the recess 311 needs to absorb stress, and the greater the maximum depth of the recess 311. Conversely, the larger the thickness of the top plate 31, the less easily it is to deform, and the less the degree to which the recess 311 needs to absorb stress, and the smaller the maximum depth of the recess 311.

[0205] If the maximum depth of the recess 311 along the first direction X is too small, the deformation degree of the recess 311 will be too small, which is not conducive to the absorption of some stress by the deformation of the recess 311 of the top plate 31. This will result in a larger bulge when the top plate 31 bulges in the direction away from the battery cell 10 due to bending moment or stress during use. If the maximum depth of the recess 311 along the first direction X is too large, after the top plate 31 deforms in the direction away from the battery cell 10 due to bending moment or stress during use, a large recessed area is likely to exist on the side of the top plate 31 away from the battery cell 10. This will make it easy for liquid, dust and other impurities to accumulate on the side of the top plate 31 away from the battery cell 10.

[0206] In the above scheme, the smaller the thickness of the top plate 31, the greater the degree of stress absorption required by the recess 311. By setting the ratio of the thickness of the top plate 31 to the maximum depth of the recess 311 along the first direction X to be greater than or equal to 0.05, while satisfying the deformation resistance of the top plate 31, a recess 311 with a larger depth is pre-deformed on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, part of the stress is absorbed by the deformation of the recess 311 to reduce the bulging phenomenon or bulging amplitude of the top plate 31 and improve the flatness of the side of the top plate 31 away from the battery cell 10. The greater the thickness of the top plate 31, the less stress the recess 311 needs to absorb. By setting the ratio of the thickness of the top plate 31 to the maximum depth of the recess 311 along the first direction X to less than or equal to 5, the top plate 31 has a certain resistance to deformation. The recess 311 with a smaller depth is pre-deformed on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, part of the stress is absorbed by the deformation of the recess 311 to reduce the bulging phenomenon or bulging amplitude of the top plate 31 and improve the flatness of the side of the top plate 31 away from the battery cell 10.

[0207] In some embodiments, T / H1 can be, but is not limited to, any one or a range between any two of 0.07, 0.08, 0.10, 0.50, 0.80, 1.00, 1.50, 1.80, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 4.90, or 5.00.

[0208] By setting the thickness of the top plate 31 to be greater than or equal to 0.7 mm, the top plate 31 has a certain strength; by setting the thickness of the top plate 31 to be less than or equal to 5 mm, the top plate 31 is easy to pre-deform and a recess 311 is formed on the side of the top plate 31 away from the battery cell 10.

[0209] In some embodiments, T can be, but is not limited to, any one or a range between any two of 0.7mm, 0.8mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.1mm, 2.3mm, 2.5mm, 2.8mm, 3.0mm, 3.2mm, 3.5mm, 3.8mm, 4.0mm, 4.2mm, 4.5mm, 4.8mm, or 5.0mm.

[0210] By setting the maximum depth of the recess 311 along the first direction X to be greater than 1 mm, the deformation of the recess 311 in the top plate 31 can absorb some of the stress. This reduces the bulging phenomenon or the extent of bulging when the top plate 31 is subjected to bending moment or stress and bulges in the direction away from the battery cell 10 along the first direction X. By setting the maximum depth of the recess 311 along the first direction X to be less than 10 mm, the degree of depression on the side of the top plate 31 away from the battery cell 10 can be reduced after the top plate 31 is subjected to bending moment or stress and deforms in the direction away from the battery cell 10 along the first direction X. This reduces the risk of liquid, dust and other impurities accumulating on the side of the top plate 31 away from the battery cell 10.

[0211] In some embodiments, H1 can be, but is not limited to, any one or a range between any two of 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm, or 10.0mm.

[0212] According to some embodiments of this application, H1 and T satisfy 0.1≤T / H1≤2, and T satisfies 0.8mm≤T≤4mm, and H1 satisfies 2mm≤H1≤8mm.

[0213] In the above scheme, by setting the ratio of the thickness of the top plate 31 to the maximum depth of the recess 311 along the first direction X to be greater than or equal to 0.1, and further, while satisfying the deformation resistance of the top plate 31, a recess 311 with a larger depth is pre-deformed on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, part of the stress is absorbed by the deformation of the recess 311, so as to reduce the bulging phenomenon or bulging amplitude of the top plate 31 and improve the flatness of the side of the top plate 31 away from the battery cell 10. By setting the ratio of the thickness of the top plate 31 to the maximum depth of the recess 311 along the first direction X to be less than or equal to 2, the top plate 31 has a certain resistance to deformation. The recess 311 with a smaller depth is pre-deformed on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, the deformation of the recess 311 absorbs part of the stress, thereby reducing the bulging phenomenon or bulging amplitude of the top plate 31 and improving the flatness of the side of the top plate 31 away from the battery cell 10.

[0214] By setting the thickness of the top plate 31 to be greater than or equal to 0.8 mm and less than or equal to 4 mm, while ensuring that the top plate 31 has a certain strength, it is further convenient for the top plate 31 to be pre-deformed to form the recess 311.

[0215] By setting the maximum depth of the recess 311 along the first direction X to be greater than or equal to 2 mm and less than or equal to 8 mm, while satisfying the stress release of the recess 311 of the top plate 31, the degree of concavity on the side of the top plate 31 away from the battery cell 10 can be reduced after the top plate 31 is affected by bending moment or stress during use and deforms along the first direction X in the direction away from the battery cell 10, thereby reducing the risk of liquid, dust and other impurities accumulating on the side of the top plate 31 away from the battery cell 10.

[0216] According to some embodiments of this application, the depth of the recess 311 gradually decreases from the center of the first arcuate wall 311a to any edge of the first arcuate wall 311a.

[0217] In the above scheme, in any direction, the recess 311 is characterized by the maximum depth at the center of the first arc-shaped wall 311a, which is conducive to the deformation of the top plate 31 under stress and facilitates the adjustment of the flatness of the top plate 31 on the side away from the battery cell 10.

[0218] According to some embodiments of this application, along the first direction, the maximum depth of the recess is H1, the elastic modulus of the top plate 31 is E, H1 and E satisfy 0.001mm / GPa≤H1 / E≤10mm / GPa, and H1 satisfies 1mm≤H1≤10mm, and E satisfies 1GPa≤E≤1000GPa.

[0219] The elastic modulus mentioned in this application refers to the compressive elastic modulus, which can be determined using commonly used testing methods in the field. As an example, the compressive elastic modulus can be measured at room temperature and normal pressure. The test can be conducted using an engineering plastics elastic modulus tester from Shanghai Hengyi Precision Instruments Co., Ltd., such as the HY-1080 model. The test can be referenced to the national standard GB / T14694-1993, the standard for the determination of the compressive elastic modulus of plastics.

[0220] If the maximum depth of the recess 311 along the first direction X is too small, the deformation degree of the recess 311 will be too small, which is not conducive to the absorption of some stress by the deformation of the recess 311 of the top plate 31. This will result in a larger bulge when the top plate 31 bulges in the direction away from the battery cell 10 due to bending moment or stress during use. If the maximum depth of the recess 311 along the first direction X is too large, after the top plate 31 deforms in the direction away from the battery cell 10 due to bending moment or stress during use, a large recessed area is likely to exist on the side of the top plate 31 away from the battery cell 10. This will make it easy for liquid, dust and other impurities to accumulate on the side of the top plate 31 away from the battery cell 10.

[0221] If the elastic modulus of the top plate 31 is too small, its resistance to deformation will be too weak, resulting in a large bulge when the top plate 31 bulges in the direction away from the battery cell 10 under the influence of bending moment or stress during use. If the elastic modulus of the top plate 31 is too large, its resistance to deformation will be too high, which is not conducive to the pre-deformation of the top plate 31 to form the recess 311.

[0222] If the elastic modulus of the top plate 31 is smaller, the degree to which the recess 311 needs to absorb stress is greater, and the maximum depth of the recess 311 is greater; if the elastic modulus of the top plate 31 is greater, the degree to which the recess 311 needs to absorb stress is smaller, and the maximum depth of the recess 311 is smaller.

[0223] In the above scheme, the smaller the elastic modulus of the top plate 31, the greater the maximum depth of the pre-deformed recess 311 needs to be, so that the deformation of the recess 311 can absorb part of the stress. By setting the ratio of the maximum depth of the recess 311 along the first direction X to the elastic modulus of the top plate 31 to be greater than or equal to 0.001 mm / GPa and less than or equal to 10 mm / GPa, when the top plate 31 has a certain resistance to deformation, a recess 311 of a certain depth can be pre-deformed on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges along the first direction X in the direction away from the battery cell 10, the deformation of the recess 311 can absorb part of the stress, thereby reducing the bulging phenomenon or bulging amplitude of the top plate 31 and improving the flatness of the side of the top plate 31 away from the battery cell 10.

[0224] In some embodiments, H1 / E can be, but is not limited to, 0.001 mm / GPa, 0.007 mm / GPa, 0.007 mm / GPa, 0.010 mm / GPa, 0.020 mm / GPa, 0.050 mm / GPa, 0.080 mm / GPa, 0.100 mm / GPa, 0.150 mm / GPa, 0.200 mm / GPa, 0.500 mm / GPa, 1.000 mm / GPa, and 1.500 mm / GPa. The range of any one or any two of the following: 1.800 mm / GPa, 2.000 mm / GPa, 2.500 mm / GPa, 2.800 mm / GPa, 3.000 mm / GPa, 4.000 mm / GPa, 5.000 mm / GPa, 6.000 mm / GPa, 7.000 mm / GPa, 8.000 mm / GPa, 9.000 mm / GPa, 9.900 mm / GPa, or 10.000 mm / GPa.

[0225] By setting the maximum depth of the recess 311 along the first direction X to be greater than or equal to 1 mm, the deformation of the recess 311 in the top plate 31 can absorb some of the stress. This reduces the bulging phenomenon or the extent of bulging when the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X. By setting the maximum depth of the recess 311 along the first direction X to be less than or equal to 10 mm, the degree of depression on the side of the top plate 31 away from the battery cell 10 can be reduced after the top plate 31 is affected by bending moment or stress during use and deforms in the direction away from the battery cell 10 along the first direction X. This reduces the risk of liquid, dust and other impurities accumulating on the side of the top plate 31 away from the battery cell 10.

[0226] In some embodiments, H1 can be, but is not limited to, any one or a range between any two of 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm, or 10mm.

[0227] By setting the elastic modulus of the top plate 31 to be greater than 1 GPa, the top plate 31 has better resistance to deformation. This reduces the bulging phenomenon or bulging amplitude of the top plate 31 to a certain extent when it is subjected to bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X. By setting the elastic modulus of the top plate 31 to be less than or equal to 1000 GPa, it is easier for the top plate 31 to be pre-deformed and to form a recess 311 on the side of the top plate 31 away from the battery cell 10.

[0228] In some embodiments, the elastic modulus E of the top plate 31 can be, but is not limited to, any one or any two of the following: 1 GPa, 2 GPa, 3 GPa, 4 GPa, 10 GPa, 50 GPa, 100 GPa, 150 GPa, 200 GPa, 250 GPa, 300 GPa, 350 GPa, 400 GPa, 500 GPa, 600 GPa, 700 GPa, 800 GPa, 900 GPa, and 1000 GPa.

[0229] According to some embodiments of this application, H1 and E satisfy 0.2mm / GPa≤H1 / E≤8mm / GPa, and H1 satisfies 2mm≤H1≤8mm, and E satisfies 1GPa≤E≤10GPa.

[0230] For example, H1 can be, but is not limited to, any one or any two of 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm or 8.0mm.

[0231] E can be any one or any two of 1.0 GPa, 1.5 GPa, 2.0 GPa, 2.2 GPa, 2.5 GPa, 3.0 GPa, 4.0 GPa, 5.0 GPa, 6.0 GPa, 7.0 GPa, 8.0 GPa, 9.0 GPa or 10.0 GPa.

[0232] H1 / E can be, but is not limited to, any one or any two of 0.2 mm / GPa, 0.5 mm / GPa, 1.0 mm / GPa, 1.5 mm / GPa, 2.0 mm / GPa, 2.5 mm / GPa, 3.0 mm / GPa, 3.5 mm / GPa, 4.0 mm / GPa, 5.0 mm / GPa, 6.0 mm / GPa, 7.0 mm / GPa, or 8.0 mm / GPa.

[0233] In the above scheme, when E satisfies 1GPa≤E≤10GPa, the material of the top plate 31 can be plastic, which has low cost and light weight. By setting the ratio of the maximum depth of the recess 311 along the first direction X to the elastic modulus of the top plate 31 to be greater than or equal to 0.2mm / GPa and less than or equal to 8mm / GPa, setting the maximum depth of the recess 311 along the first direction X to be greater than or equal to 2mm and less than or equal to 8mm, and setting the elastic modulus of the top plate 31 to be greater than or equal to 1GPa and less than or equal to 10GPa, under the condition that the top plate 31 has a certain resistance to deformation, the recess 311 can be pre-deformed to a certain depth on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges along the first direction X in the direction away from the battery cell 10, the deformation of the recess 311 absorbs part of the stress, thereby reducing the bulging phenomenon or bulging amplitude of the top plate 31 and improving the flatness of the side of the top plate 31 away from the battery cell 10.

[0234] According to some embodiments of this application, H1 and E satisfy 0.0067mm / GPa≤H1 / E≤0.08mm / GPa, and H1 satisfies 2mm≤H1≤8mm, and E satisfies 100GPa≤E≤300GPa.

[0235] For example, H1 can be any one or any two of 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, and 8mm.

[0236] E can be any one or any two of 100GPa, 120GPa, 1140GPa, 160GPa, 180GPa, 200GPa, 220GPa, 240GPa, 260GPa, 280GPa, and 300GPa.

[0237] H1 / E can be, but is not limited to, any one of 0.0067 mm / GPa, 0.0070 mm / GPa, 0.008 mm / GPa, 0.01 mm / GPa, 0.02 mm / GPa, 0.03 mm / GPa, 0.04 mm / GPa, 0.05 mm / GPa, 0.06 mm / GPa, 0.07 mm / GPa, or 0.08 mm / GPa, or a range between any two of them.

[0238] In the above scheme, when E satisfies 100GPa≤E≤300GPa, the material of the top plate 31 can be metal, such as alloy (e.g., steel, titanium alloy); by setting the ratio of the maximum depth of the recess 311 along the first direction X to the elastic modulus of the top plate 31 to be greater than or equal to 0.0067mm / GPa and less than or equal to 0.08mm / GPa, setting the maximum depth of the recess 311 along the first direction X to be greater than or equal to 2mm and less than or equal to 8mm, and setting the elastic modulus of the top plate 31 to be greater than or equal to 2mm and less than or equal to 8mm, the elastic modulus of the top plate 31 can be set to be greater than or equal to 2mm and less than or equal to 8mm. The pressure is set to be greater than or equal to 100 GPa and less than or equal to 300 GPa. Under the condition that the top plate 31 has a certain resistance to deformation, a recess 311 of a certain depth can be pre-deformed on the top plate 31. When the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, the deformation of the recess 311 absorbs part of the stress, thereby reducing the bulging phenomenon or bulging amplitude of the top plate 31 and improving the flatness of the side of the top plate 31 away from the battery cell 10.

[0239] According to some embodiments of this application, the top plate 31 is made of plastic, resin fiber composite material or alloy.

[0240] For example, plastics may include polypropylene and its polymers.

[0241] For example, resin fiber composite materials may include glass fiber reinforced polyester resin composite materials and carbon fiber reinforced epoxy resin composite materials.

[0242] For example, the alloy may include steel.

[0243] In the above scheme, plastic has a certain strength and is lightweight, which can reduce the overall weight of the battery device 100 and has a low manufacturing cost; resin fiber composite material has high strength and is not easily damaged; alloy has high impact and pressure resistance, reducing the risk of damage to the top plate 31.

[0244] According to some embodiments of this application, please refer to Figure 4 and Figure 8 As shown, the dimension of the top plate 31 along the second direction Z is L2, and the dimension of the top plate 31 along the third direction Y is W2, which satisfies 1≤L2 / W2≤8.

[0245] The dimensions of the top plate 31 along the second direction Z and the dimensions of the top plate 31 along the third direction Y can both be measured by a coordinate measuring machine.

[0246] The second direction Z can be parallel to the length direction of the battery device 100, that is, the second direction Z can be parallel to the length direction of the power-consuming device. In some embodiments, the dimension of the top plate 31 along the second direction Z can be greater than or equal to the dimension of the top plate 31 along the third direction Y.

[0247] If the ratio of the dimension of the top plate 31 along the second direction Z to the dimension of the top plate 31 along the third direction Y is too small, the dimension of the recess 311 in the second direction Z will be too small. This is not conducive to absorbing some stress through the deformation of the recess 311 of the top plate 31, making the top plate 31 prone to bulging in the direction away from the battery cell 10 when subjected to bending moment or stress during use. If the ratio of the dimension of the top plate 31 along the second direction Z to the dimension of the top plate 31 along the third direction Y is too large, the compressive strength of the top plate 31 will be too low, and the top plate 31 will be more prone to deformation under stress. During use, the top plate 31 will be more prone to bulging in the direction away from the battery cell 10 when subjected to bending moment or stress.

[0248] In the above scheme, by setting the ratio of the dimension of the top plate 31 along the second direction Z to the dimension of the top plate 31 along the third direction Y to be greater than or equal to 1, the recess 311 can be set with a larger dimension in the second direction Z, so that when the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent; by setting the ratio of the dimension of the top plate 31 along the second direction Z to the dimension of the top plate 31 along the third direction Y to be less than or equal to 8, the top plate 31 has higher compressive strength, so that when the top plate 31 is affected by bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X, the bulging phenomenon or bulging amplitude of the top plate 31 can be reduced to a certain extent.

[0249] In some embodiments, L2 / W2 can be, but is not limited to, any one or any two of 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 6.5, 7, 7.5 or 8.

[0250] According to some embodiments of this application, see Figure 4 and Figure 8 As shown, the top plate 31 and the second side wall plate 32 are integrally formed.

[0251] For example, in the embodiments of this application, the top plate 31 and the second side wall plate 32 of the second box body 30 can be an integral structure formed by injection molding.

[0252] In this embodiment, by setting the top plate 31 and the second side wall plate 32 of the second box body 30 as an integrally formed structure, the connection stability and reliability between the top plate 31 and the second side wall plate 32 are improved, thereby improving the overall structural strength of the second box body 30.

[0253] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5As shown, the first box body 20 may include two first side wall panels 22 arranged opposite each other along the third direction Y, and the second box body 30 may include two second side wall panels 32 arranged opposite each other along the third direction Y, with each second side wall panel 32 connected to one of the first side wall panels 22. The first box body 20 may also include two third side wall panels 23 arranged opposite each other along the second direction Z, with both third side wall panels 23 connected to the side of the support plate 21 facing the top plate 31. The two third side wall panels 23 are located at both ends of the second box body 30 in the second direction Z, and the top plate 31 and the two second side wall panels 32 are all connected to the third side wall panels 23. The first direction X, the third direction Y, and the second direction Z are perpendicular to each other.

[0254] The two second side wall panels 32 of the second box body 30 are respectively connected to the two ends of the top plate 31 in the third direction Y, so that the cross section of the second box body 30 perpendicular to the second direction Z has a "U" shape and the two ends of the second box body 30 in the second direction Z are open. Correspondingly, the two third side wall panels 23 of the first box body 20 are respectively used to block the two ends of the second box body 30 in the second direction Z. That is, the third side wall panel 23 connected to the side of the bearing plate 21 facing the top plate 31 is connected to both the top plate 31 and the two second side wall panels 32, so that the cross section of the first box body 20 perpendicular to the third direction Y also has a "U" shape.

[0255] For example, the third sidewall panel 23 protrudes beyond the bearing surface 211 in the first direction X by a larger dimension than the first sidewall panel 22 protrudes beyond the bearing surface 211 in the first direction X.

[0256] In this embodiment, the first box body 20 includes two first side wall panels 22 arranged opposite each other along the third direction Y, and the second box body 30 includes two second side wall panels 32 arranged opposite each other along the third direction Y. Each second side wall panel 32 is connected to one of the first side wall panels 22 to realize the mutual connection between the two sides of the first box body 20 and the second box body 30 in the third direction Y. The first box body 20 also includes two third side wall panels 23 arranged at both ends of the top plate 31 along the second direction Z. Each third side wall panel 23 is connected to the top plate 31 and the two second side wall panels 32 of the second box body 30 to realize the mutual connection between the two sides of the first box body 20 and the second box body 30 in the second direction Z. This enables the assembly connection between the first box body 20 and the second box body 30 and jointly defines the assembly space 40a for accommodating the battery cell 10. The structure is simple and easy to assemble.

[0257] According to some embodiments of this application, in conjunction with Figure 3 , Figure 4 and Figure 5As shown, the second box body 30 has a first flange edge 33 at both ends in the second direction Z, and the first flange edge 33 connects the top plate 31 and the two second side wall plates 32. The two ends of the third side wall plate 23 in the third direction Y and the end of the third side wall plate 23 away from the bearing plate 21 in the first direction X are both connected to the first flange edge 33.

[0258] The second box body 30 is provided with a first flange edge 33 at both ends in the second direction Z. The first flange edge 33 connects the top plate 31 and the two second side wall plates 32. That is to say, the second box body 30 also includes two first flange edges 33 arranged at intervals in the second direction Z. The top plate 31 and the second side wall plates 32 are both located between the two first flange edges 33 in the second direction Z. The two ends of the top plate 31 in the second direction Z are respectively connected to the two first flange edges 33, and the two ends of the second side wall plates 32 in the second direction Z are respectively connected to the two first flange edges 33, so that a first flange edge 33 has a structure that connects to one end of the top plate 31 and one end of the two second side wall plates 32 at the same time.

[0259] Optionally, combined Figure 2 , Figure 3 and Figure 4 As shown, the battery device 100 also includes a first locking member 50, which locks the first flange edge 33 and the third side wall plate 23 to connect the first flange edge 33 and the third side wall plate 23. Exemplarily, the first locking member 50 is a bolt, which passes through the first flange edge 33 and is screwed onto the third side wall plate 23 to lock the first flange edge 33 and the third side wall plate 23. Of course, in other embodiments, the first locking member 50 that locks the first flange edge 33 and the third side wall plate 23 can also be a rivet or the like.

[0260] In this embodiment, by providing a first flange edge 33 on the second box body 30 to connect the top plate 31 and the two second side wall plates 32, and by having both ends of the third side wall plate 23 in the third direction Y and the end of the third side wall plate 23 away from the bearing plate 21 in the first direction X connected to the first flange edge 33, the third side wall plate 23 is a structure that is interconnected with the top plate 31 and the two second side wall plates 32 of the second box body 30 through the first flange edge 33, thereby reducing the assembly difficulty between the third side wall plate 23 and the second box body 30.

[0261] According to some embodiments of this application, see Figure 4As shown, the first flange edge 33 may include a first segment 331 and two second segments 332. The first segment 331 is connected to the top plate 31, and the end of the third side wall plate 23 away from the bearing plate 21 in the first direction X is connected to the first segment 331. The two second segments 332 are respectively connected to the two second side wall plates 32, and the two ends of the third side wall plate 23 in the third direction Y are respectively connected to the two second segments 332. The first flange edge 33 may also include an arc segment 333, and each second segment 332 is connected to the first segment 331 through an arc segment 333.

[0262] The first segment 331 is the area where the first flange edge 33 is connected to the top plate 31, the second segment 332 is the area where the first flange edge 33 is connected to the second side wall plate 32, and the arc segment 333 is the area in the first flange edge 33 that connects the first segment 331 and the second segment 332, so that the connection position of the first segment 331 and the second segment 332 is a structure with an arc transition.

[0263] In this embodiment, an arc segment 333 is connected between the first segment 331 connecting the first flange edge 33 to the top plate 31 and the second segment 332 connecting the first flange edge 33 to the second side wall plate 32. This creates an arc transition structure between the area where the first flange edge 33 connects to the top plate 31 and the area where the first flange edge 33 connects to the second side wall plate 32. This reduces the occurrence of sharp corners at the connection point of the first flange edge 33 with the top plate 31 and the second side wall plate 32. Consequently, it facilitates the assembly and connection of the first flange edge 33 with the third side wall plate 23, reducing the assembly difficulty between them. Furthermore, it alleviates stress concentration at the connection point of the first flange edge 33 with the top plate 31 and the second side wall plate 32, thereby reducing the risk of damage or cracking of the first flange edge 33 during use.

[0264] According to some embodiments of this application, see Figure 4 and Figure 8 As shown, the first segment 331 and the top plate 31 are connected by a connecting portion 34. The top plate 31 has a first inner surface 313 facing the support plate 21 in the first direction X, and the first segment 331 has a second inner surface 3311 facing the support plate 21 in the first direction X. The second inner surface 3311 abuts against the third side wall plate 23, and the second inner surface 3311 and the first inner surface 313 are connected by the inner surface of the connecting portion 34. Along the first direction X, the first inner surface 313 is further away from the support plate 21 than the second inner surface 3311.

[0265] Among them, the connecting part 34 is a component in the second box body 30 that connects the first section 331 and the top plate 31. Correspondingly, the arc section 333 of the first flange edge 33 is also a structure that connects to the top plate 31 and the second side wall plate 32 through the connecting part 34.

[0266] Along the first direction X, the first inner surface 313 is further away from the support plate 21 than the second inner surface 3311. In other words, the overall structure formed by the top plate 31, the connecting part 34 and the first section 331 of the first flange edge 33 of the second box body 30 is a structure that is recessed from the second inner surface 3311 of the first section 331 in the direction away from the battery cell 10 at the position corresponding to the top plate 31.

[0267] In this embodiment, the first segment 331 of the first flange edge 33 and the top plate 31 are connected to each other through the connecting part 34, and the first inner surface 313 of the top plate 31 is further away from the bearing plate 21 in the first direction X than the second inner surface 3311 of the first segment 331. This ensures that the arc segment 333 and other structures of the first flange edge 33 do not excessively affect the shape of the top plate 31 and the second side wall plate 32. As a result, the side of the second box body 30 facing the battery cell 10 and the position corresponding to the top plate 31 are recessed in the direction away from the battery cell 10 along the first direction X. This allows the second box body 30 to be assembled and connected to the third side wall plate 23 of the first box body 20 through the first flange edge 33, and also increases the volume of the assembly space 40a jointly defined by the first box body 20 and the second box body 30. This reduces the assembly difficulty of the second box body 30 and the third side wall plate 23 of the first box body 20 while increasing the internal space of the battery device 100 for accommodating the battery cell 10.

[0268] According to some embodiments of this application, the thickness of the first segment 331 is greater than the thickness of the top plate 31.

[0269] In the above scheme, the thickness of the first segment 331 is greater than the thickness of the top plate 31. The first segment 331 has higher strength, which facilitates the firm connection between the first segment 331 and the third side wall plate 23.

[0270] According to some embodiments of this application, please refer to Figure 4 Along the second direction Z, the dimension of the first flange edge 33 is L3, which satisfies 20mm≤L3≤35mm.

[0271] If the dimension of the first flange edge 33 along the second direction Z is too small, the connection area between the first flange edge 33 and the third side wall plate 23 will be too small, and the connection reliability between the first flange edge 33 and the third side wall plate 23 will be too low; if the dimension of the first flange edge 33 along the second direction Z is too large, it will occupy too much assembly space 40a, affecting the energy density of the battery device 100.

[0272] In the above scheme, by setting the dimension of the first flange edge 33 along the second direction Z to be greater than or equal to 20mm, a larger connection area is provided between the first flange edge 33 and the third side wall plate 23, which facilitates the improvement of the connection reliability between the first flange edge 33 and the third side wall plate 23; by setting the dimension of the first flange edge 33 along the second direction Z to be less than or equal to 35mm, while satisfying the requirement of a large connection area between the first flange edge 33 and the third side wall plate 23, the occupation of the first flange edge 33 on the assembly space 40a is reduced, so that the battery device 100 has a higher energy density.

[0273] In some embodiments, L3 can be any one of 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm or 35mm.

[0274] According to some embodiments of this application, 22mm≤L3≤28mm.

[0275] For example, L3 can be any one of 22mm, 22.4mm, 22.8mm, 23.2mm, 23.6mm, 24.2mm, 24.6mm, 25.2mm, 25.6mm, 26.2mm, 26.6mm, 27.2mm, 27.6mm or 28mm.

[0276] In the above scheme, by setting the dimension of the first flange edge 33 along the second direction Z to be greater than or equal to 22mm, the first flange edge 33 and the third side wall plate 23 have a larger connection area, which facilitates the improvement of the connection reliability between the first flange edge 33 and the third side wall plate 23; by setting the dimension of the first flange edge 33 along the second direction Z to be less than or equal to 28mm, while satisfying the requirement of a large connection area between the first flange edge 33 and the third side wall plate 23, the occupation of the first flange edge 33 on the assembly space 40a is further reduced, so that the battery device 100 has a higher energy density.

[0277] According to some embodiments of this application, see Figure 4 As shown, the second sidewall panel 32 has a second flange edge 322 connected to the first sidewall panel 22 at the end away from the top plate 31 in the first direction X. The two ends of the second flange edge 322 of each second sidewall panel 32 are respectively connected to two first flange edges 33 in the second direction Z.

[0278] In an embodiment where the second flange edge 322 is connected to the second segment 332 of the first flange edge 33, and the second box body 30 includes two second side wall panels 32, and each second side wall panel 32 is formed with a second flange edge 322, then it is a structure in which one second flange edge 322, one first flange edge 33, another second flange edge 322 and another first flange edge 33 are connected end to end in sequence.

[0279] In this embodiment, by connecting the two ends of the second flange edge 322 of the second side wall plate 32 in the second direction Z to the two first flange edges 33 located at the two ends of the top plate 31 in the second direction Z, the second flange edge 322 and the first flange edge 33 of the second box body 30 used for assembly and connection with the first box body 20 are formed into an integral structure. This not only improves the overall structural strength of the second box body 30, but also effectively improves the assembly reliability between the second box body 30 and the first box body 20.

[0280] According to some embodiments of this application, see Figure 3 As shown, the battery device 100 may further include a first seal (not shown in the figure), which is disposed between the first flange edge 33 and the third side wall plate 23 to seal the gap between the first flange edge 33 and the third side wall plate 23.

[0281] The third side wall plate 23 is a structure located on the inner side of the first flange edge 33 facing the bearing plate 21. Correspondingly, the first sealing element is a strip structure with the same extension direction as the first flange edge 33. The third side wall plate 23 is provided with the first sealing element at one end away from the bearing plate 21 in the first direction X and at both ends of the third side wall plate 23 in the third direction Y.

[0282] For example, the material of the first seal can be various, such as plastic, rubber or silicone.

[0283] In this embodiment, by providing a first sealing element between the first flange edge 33 and the third side wall plate 23, the first sealing element can seal the gap between the first flange edge 33 and the third side wall plate 23. This helps to improve the sealing performance of the assembly space 40a jointly defined by the first box body 20 and the second box body 30. As a result, during use, the risk of impurities such as water vapor or liquid entering the assembly space 40a from the gap between the first flange edge 33 and the third side wall plate 23 can be reduced, thereby improving the reliability and service life of the battery device 100.

[0284] In some embodiments, see Figure 4 , Figure 5 and Figure 7As shown, the second sidewall panel 32 has a second flange edge 322 connected to the first sidewall panel 22 at the end away from the top plate 31 in the first direction X. The thickness direction of the second flange edge 322 is parallel to the third direction Y, and the second flange edge 322 and the first sidewall panel 22 are stacked along the third direction Y.

[0285] In an embodiment where the wall thickness of the second flange edge 322 of the second side wall panel 32 is greater than the wall thickness of the body portion 321 of the second side wall panel 32, the thickness dimension of the second flange edge 322 in the third direction Y is greater than the thickness dimension of the body portion 321 in the third direction Y.

[0286] In this embodiment, by setting the second flange edge 322 of the second side wall plate 32, which is used to connect with the first side wall plate 22, to be stacked with the first side wall plate 22 along the third direction Y, the stacking direction of the second flange edge 322 and the first side wall plate 22 is consistent with the thickness direction of the second flange edge 322 and the same as the arrangement direction of the two first side wall plates 22. This facilitates the stacking and connection of the two second side wall plates 32 with the two first side wall plates 22 along the third direction Y, which helps to reduce the assembly difficulty between the first side wall plate 22 and the second side wall plate 32 and improves the assembly stability between the first side wall plate 22 and the second side wall plate 32.

[0287] In some embodiments, see Figure 4 and Figure 7 The battery device 100 may also include a second seal 60, which is disposed between the first side wall plate 22 and the second flange edge 322 to seal the gap between the first side wall plate 22 and the second flange edge 322.

[0288] The second sealing element 60 is disposed between the first side wall plate 22 and the second flange edge 322 to seal the gap between the first side wall plate 22 and the second flange edge 322. The material of the second sealing element 60 can be various, such as rubber, plastic or silicone.

[0289] By providing a second sealing element 60 between the second flange edge 322 and the first side wall plate 22, the second sealing element 60 can seal the gap between the second flange edge 322 and the first side wall plate 22. This helps to improve the sealing performance of the assembly space 40a jointly defined by the first housing body 20 and the second housing body 30. As a result, the risk of water vapor or liquid impurities entering the assembly space 40a from the gap between the second flange edge 322 and the first side wall plate 22 can be reduced during use, thereby improving the reliability and service life of the battery device 100.

[0290] In some embodiments, see Figure 7As shown, the first sidewall panel 22 and the second flange edge 322 do not contact each other. Along the stacking direction of the first sidewall panel 22 and the second flange edge 322, the second flange edge 322 abuts against the first sidewall panel 22 through the second sealing member 60. That is to say, the first sidewall panel 22 is a structure that indirectly abuts against the second flange edge 322 through the second sealing member 60. Correspondingly, the first sidewall panel 22 and the second flange edge 322 are arranged at intervals, and the second sealing member 60 is disposed between the first sidewall panel 22 and the second flange edge 322 and separates the first sidewall panel 22 and the second flange edge 322.

[0291] In this embodiment, by setting the first side wall plate 22 and the second flange edge 322 to be indirectly abutted by the second sealing member 60, the second sealing member 60 can also play a certain buffering role between the first side wall plate 22 and the second flange edge 322. When the first box body 20 is deformed due to the torque generated by the target component during use, the stress generated by the deformation of the first box body 20 can be absorbed and released by the second sealing member 60 during the process of being transmitted through the first side wall plate 22 to the second flange edge 322 of the second side wall plate 32. This can reduce the stress impact on the second box body 30 and further alleviate the deformation or bulging of the top plate 31 of the second box body 30 during use.

[0292] In some embodiments, combined with Figure 2 and Figure 7 As shown, the battery device 100 may also include a first locking member 50, which passes through the second sealing member 60 and locks the second flange edge 322 and the first side wall plate 22.

[0293] The first locking element 50 serves to connect the second flange edge 322 and the first side wall plate 22. The structure of the first locking element 50 can be varied, such as a bolt or rivet. For example, in... Figure 7 In the first locking component 50, the first locking component 50 is a bolt. The first locking component 50 is inserted into the second flange edge 322 along the stacking direction of the first side wall plate 22 and the second flange edge 322 and screwed onto the first side wall plate 22.

[0294] Optionally, the first sidewall panel 22 has a mating portion 221 that is threadedly engaged with the first locking member 50. The mating portion 221 is threadedly engaged with the first locking member 50 to realize that the first locking member 50 is screwed onto the first sidewall panel 22. For example, in Figure 7 In this embodiment, the mating part 221 is the rivet nut on the first side wall plate 22, and the mating part 221 and the second flange edge 322 are also structures that abut against each other through the second sealing member 60. Of course, in other embodiments, the mating part 221 can also be the area on the first side wall plate 22 with threaded holes.

[0295] In this embodiment, the battery device 100 is further provided with a first locking member 50 that passes through the second sealing member 60 and locks the second flange edge 322 and the first side wall plate 22. The first locking member 50 enables the second flange edge 322 and the first side wall plate 22 to be connected to each other, and enables both the second flange edge 322 and the first side wall plate 22 to be tightly abutted against the second sealing member 60. This improves the sealing effect of the second sealing member 60 on the gap between the second flange edge 322 and the first side wall plate 22, and also facilitates the second sealing member 60 to absorb the stress transmitted from the first side wall plate 22 to the second flange edge 322 of the second side wall plate 32.

[0296] Of course, in other embodiments, the battery device 100 can also have other structures, for example, referring to Figure 10 and Figure 11 As shown, Figure 10 Cross-sectional views of the battery device provided in some embodiments of this application in other embodiments. Figure 11 for Figure 10 The diagram shows a partial enlarged view of point C in the battery device. Along the stacking direction of the first sidewall panel 22 and the second flange edge 322, a contact portion 3221 protrudes from the surface of the second flange edge 322 facing the first sidewall panel 22, and the contact portion 3221 directly abuts against the first sidewall panel 22. In a projection plane perpendicular to the stacking direction of the first sidewall panel 22 and the second flange edge 322, the orthographic projection of the contact portion 3221 and the orthographic projection of the second sealing member 60 do not overlap.

[0297] The abutting part 3221 is a protruding structure on the surface of the second flange edge 322 facing the first side wall plate 22, so that the second flange edge 322 is in direct contact with the first side wall plate 22 through the abutting part 3221.

[0298] In the projection plane perpendicular to the stacking direction of the first sidewall panel 22 and the second flange edge 322, the orthographic projection of the abutment portion 3221 and the orthographic projection of the second sealing member 60 do not overlap. That is, the second sealing member 60 does not extend between the abutment portion 3221 and the first sidewall panel 22. For example, in Figure 11 In the middle, the first side wall plate 22 and the second flange edge 322 are stacked in the third direction Y. Correspondingly, the second sealing member 60 is located on one side of the abutment portion 3221 in the first direction X.

[0299] In this embodiment, an abutment portion 3221 is provided on the surface of the second flange edge 322 facing the first side wall plate 22, directly abutting against the first side wall plate 22. The projection of the abutment portion 3221 in the stacking direction of the first side wall plate 22 and the second flange edge 322 does not overlap with the projection of the second seal 60 in the stacking direction of the first side wall plate 22 and the second flange edge 322. This makes the abutment portion 3221 a structure that directly contacts the first side wall plate 22 and is misaligned with the second seal 60. The battery device 100 with this structure can reduce the damage or destruction caused to the second seal 60 by the mutual squeezing of the abutment portion 3221 and the first side wall plate 22, which is beneficial to improving the service life and sealing reliability of the second seal 60.

[0300] In the embodiment where the abutment portion 3221 of the second flange edge 322 directly abuts against the first side wall plate 22, see [reference needed]. Figure 11 As shown, the battery device 100 may also include a first locking member 50, which locks the abutment portion 3221 and the first side wall plate 22.

[0301] The first locking member 50 serves to connect the abutment portion 3221 and the first side wall plate 22. The structure of the first locking member 50 can be varied, such as a bolt or rivet. For example, in... Figure 11 In the first locking member 50, the first locking member 50 is a bolt. The first locking member 50 is inserted into the second flange edge 322 along the stacking direction of the first side wall plate 22 and the second flange edge 322 and passes through the abutment part 3221. The first locking member 50 is screwed onto the first side wall plate 22.

[0302] Optionally, the first sidewall panel 22 has a mating portion 221 that is threadedly engaged with the first locking member 50. The mating portion 221 is threadedly engaged with the first locking member 50 to realize that the first locking member 50 is screwed onto the first sidewall panel 22. For example, in Figure 11 In this embodiment, the mating part 221 is the rivet nut on the first side wall plate 22, and the abutting part 3221 of the second flange edge 322 directly abuts against the mating part 221. Of course, in other embodiments, the mating part 221 can also be the area on the first side wall plate 22 with threaded holes.

[0303] In this embodiment, by locking the abutment portion 3221 and the first side wall plate 22 with the first locking member 50, the second flange edge 322 and the first side wall plate 22 can be connected to each other, and the abutment portion 3221 of the second flange edge 322 can be tightly abutted against the first side wall plate 22, so as to reduce the damage to the second seal 60 caused by the slippage or misalignment of the abutment portion 3221 and the first side wall plate 22.

[0304] In the embodiment where the abutment portion 3221 of the second flange edge 322 directly abuts against the first sidewall plate 22, please continue to refer to... Figure 11 As shown, in the projection plane perpendicular to the stacking direction of the first sidewall panel 22 and the second flange edge 322, the orthographic projection of the second seal 60 and the orthographic projection of the support plate 21 can also be non-overlapping. That is, in the stacking direction of the first sidewall panel 22 and the second flange edge 322, the support plate 21 is not obstructed by the second seal 60.

[0305] In this embodiment, by setting the orthographic projection of the second seal 60 in the projection plane perpendicular to the stacking direction of the first side wall plate 22 and the second flange edge 322 to not overlap with the orthographic projection of the support plate 21 in the projection plane perpendicular to the stacking direction of the first side wall plate 22 and the second flange edge 322, the second seal 60 and the support plate 21 do not have an overlapping relationship in the stacking direction of the first side wall plate 22 and the second flange edge 322. This reduces the phenomenon that the stress on the support plate 21 in the stacking direction of the first side wall plate 22 and the second flange edge 322 will be directly applied to the second seal 60 through the first side wall plate 22. This reduces the risk of damage or failure of the second seal 60 during use and helps to improve the service life and sealing reliability of the second seal 60.

[0306] In the embodiment where the abutment portion 3221 of the second flange edge 322 directly abuts against the first sidewall plate 22, please continue to refer to... Figure 11 As shown, along the stacking direction of the first side wall plate 22 and the second flange edge 322, a limiting part 222 is protruded on the surface of the first side wall plate 22 facing the second flange edge 322 or the surface of the second flange edge 322 facing the first side wall plate 22. The limiting part 222 and the abutting part 3221 are spaced apart, and the second sealing member 60 is located between the limiting part 222 and the abutting part 3221.

[0307] The limiting part 222 can be a structure protruding from the first side wall plate 22, or it can be a structure protruding from the second flange edge 322. For example, in Figure 11 In the middle, a limiting part 222 is protruding on the surface of the first side wall plate 22 facing the second flange edge 322.

[0308] The limiting portion 222 and the abutment portion 3221 are spaced apart, and the second sealing member 60 is located between the limiting portion 222 and the abutment portion 3221. That is, in a direction perpendicular to the stacking direction of the first side wall plate 22 and the second flange edge 322, the second sealing member 60 has a structure disposed between the limiting portion 222 and the abutment portion 3221. For example, in Figure 11 In the middle, the first side wall plate 22 and the second flange edge 322 are stacked along the third direction Y. Correspondingly, the abutment part 3221 and the limiting part 222 are arranged at intervals along the first direction X, and the second sealing member 60 is located between the abutment part 3221 and the limiting part 222 in the first direction X.

[0309] In this embodiment, a limiting part 222 is provided on the surface of the first side wall plate 22 facing the second flange edge 322 or on the surface of the second flange edge 322 facing the first side wall plate 22, and the second sealing member 60 is a structure disposed between the limiting part 222 and the abutting part 3221, so that the limiting part 222 and the abutting part 3221 can cooperate to play a certain assembly limiting role for the second sealing member 60, thereby reducing the phenomenon of the second sealing member 60 detaching or falling off from the second flange edge 322 and the first side wall plate 22 during use, which is beneficial to improving the assembly stability and sealing reliability of the second sealing member 60.

[0310] In some embodiments, see Figure 7 As shown, along the third direction Y, the first sidewall panel 22 is located on the side of the second flange edge 322 facing the assembly space 40a. That is, the two first sidewall panels 22 of the first housing body 20 are located between the two second sidewall panels 32 of the second housing body 30 in the third direction Y.

[0311] In the embodiment where the second flange edge 322 of the second side wall plate 32 is screwed onto the first side wall plate 22 by the first locking member 50, the assembly difficulty of screwing the first locking member 50 onto the first side wall plate 22 can be reduced by setting the first side wall plate 22 to be located on the side of the second flange edge 322 facing the assembly space 40a in the third direction Y.

[0312] In this embodiment, by setting the first side wall panel 22 to be located on the side of the second flange edge 322 facing the assembly space 40a in the third direction Y, the two first side wall panels 22 of the first box body 20 are located between the two second side wall panels 32 in the third direction Y, so that the second side wall panel 32 with a larger size in the first direction X is located outside the two first side wall panels 22 in the third direction Y. This facilitates the second side wall panel 32 to cover the first side wall panel 22 and helps to reduce the assembly difficulty between the first side wall panel 22 and the second side wall panel 32.

[0313] According to some embodiments of this application, see Figure 7 As shown, the first side wall panel 22 and the supporting plate 21 are separately arranged but connected.

[0314] For example, the connection structure between the first side wall panel 22 and the bearing plate 21 can be various, such as welding connection, bolt connection, snap connection or adhesive connection.

[0315] In this embodiment, by setting the first side wall panel 22 and the support plate 21 as separate structures, on the one hand, the difficulty of setting the first side wall panel 22 on both sides of the support plate 21 along the third direction Y can be reduced, thereby reducing the manufacturing difficulty of the first box body 20. On the other hand, the position of the first side wall panel 22 in the first direction X can be adjusted according to the actual situation, so as to adjust the size of the support surface 211 of the first side wall panel 22 protruding from the support plate 21 in the first direction X, which is beneficial to improving the applicability of the first box body 20.

[0316] According to some embodiments of this application, see Figure 5 As shown, the third side wall panel 23 is detachably connected to the support plate 21.

[0317] For example, the third side wall panel 23 and the supporting plate 21 are connected by bolts.

[0318] In this embodiment, by setting the third side wall panel 23 to be detachably connected to the support plate 21, different third side wall panels 23 can be replaced according to different usage requirements, and it is convenient to maintain and repair the first box body 20 in the future, which helps to reduce the later use cost of the battery device 100.

[0319] According to some embodiments of this application, see Figure 3 and Figure 5 As shown, the first box body 20 may also include a reinforcing member 24. The reinforcing member 24 is disposed on the side of the support plate 21 facing the top plate 31, the reinforcing member 24 extends along the third direction Y, and the two ends of the reinforcing member 24 in the third direction Y are respectively connected to the two first side wall plates 22.

[0320] Among them, the reinforcing member 24 is a strip structure extending along the third direction Y, and the two ends of the reinforcing member 24 in the third direction Y are respectively connected to the two first side wall panels 22 of the first box body 20.

[0321] For example, the reinforcement 24 is bolted to the side of the support plate 21 facing the top plate 31. Of course, in other embodiments, the reinforcement 24 may also be welded or bonded to the support plate 21.

[0322] In this embodiment, by providing a reinforcing member 24 on the side of the support plate 21 facing the top plate 31, and extending along the third direction Y and connecting with both first side wall plates 22, the two first side wall plates 22 located on both sides of the support plate 21 in the third direction Y can be further reinforced and strengthened by the reinforcing member 24, which is beneficial to improving the overall structural strength of the first box body 20.

[0323] In some embodiments, please continue to see Figure 3 and Figure 5As shown, the first housing body 20 may include two reinforcing members 24, which are arranged at intervals along the second direction Z. Along the second direction Z, the battery cell 10 is disposed between the two reinforcing members 24.

[0324] The battery device 100 includes a plurality of battery cells 10, and the overall structure formed by the plurality of battery cells 10 is such that both sides of the battery cells 10 abut against two reinforcing members 24 in the second direction Z.

[0325] In this embodiment, by providing two reinforcing members 24 on the support plate 21, and the two reinforcing members 24 being arranged at intervals along the second direction Z on both sides of all battery cells 10, the battery device 100 with this structure can, on the one hand, connect the two reinforcing members 24 and the two first side wall plates 22 to form an integral frame structure, which is beneficial to further improve the overall structural strength of the first box body 20. On the other hand, the two reinforcing members 24 can also play a certain limiting role on the battery cells 10 placed on the support plate 21 in the second direction Z, so as to reduce the risk of the battery cells 10 shaking or shifting along the second direction Z during use.

[0326] Of course, the structure of the battery device 100 is not limited to this. According to some embodiments of this application, the battery device 100 can also have other structures, see reference. Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, Figure 12 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application. Figure 13 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 14 This is a schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application. Figure 15 This is a schematic diagram of the structure of the first housing body of a battery device provided in some embodiments of this application. The first housing body 20 may include a plurality of first side wall panels 22, which surround the support plate 21 and are connected end to end in sequence. The second housing body 30 may include a plurality of second side wall panels 32, which surround the top plate 31 and are connected end to end in sequence, with each second side wall panel 32 connected to a first side wall panel 22.

[0327] The first box body 20 includes a plurality of first side wall panels 22 connected end to end, and the plurality of first side wall panels 22 surround the support plate 21, making the first box body 20 a hollow structure with an opening on the side facing the second box body 30 in the first direction X. Similarly, the second box body 30 includes a plurality of second side wall panels 32 connected end to end, and the plurality of second side wall panels 32 surround the top plate 31, making the second box body 30 a hollow structure with an opening on the side facing the first box body 20 in the first direction X. Correspondingly, each second side wall panel 32 is connected to a first side wall panel 22, so that the first box body 20 and the second box body 30 are mutually covering structures.

[0328] In this embodiment, the first box body 20 is provided with a plurality of first side wall panels 22 surrounding the support plate 21. Correspondingly, the second box body 30 is provided with a plurality of second side wall panels 32 surrounding the top plate 31. Each second side wall panel 32 is connected to a first side wall panel 22, so that both the first box body 20 and the second box body 30 are open on one side and cover each other. This enables the assembly connection between the first box body 20 and the second box body 30 and jointly defines the assembly space 40a for accommodating the battery cell 10. The structure is simple and easy to implement.

[0329] According to some embodiments of this application, refer to Figure 13 , Figure 14 and Figure 15 Please refer to further details. Figure 16 and Figure 17 , Figure 16 A cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to the second direction. Figure 17 This is a cross-sectional view of the first housing body of a battery device provided in some embodiments of this application, perpendicular to the second direction. The second side wall panel 32 has a second flange edge 322 connected to the first side wall panel 22 at its end away from the top plate 31 in the first direction X. The thickness direction of the second flange edge 322 is parallel to the first direction X, and the second flange edge 322 and the first side wall panel 22 are stacked along the first direction X.

[0330] The second sidewall panel 32 includes a body portion 321 and a second flange edge 322 that are connected to each other. The two ends of the body portion 321 in the first direction X are respectively connected to the top plate 31 and the second flange edge 322. The thickness direction of the second flange edge 322 is parallel to the first direction X. Thus, the body portion 321 and the second flange edge 322 form an "L" shape. Correspondingly, the thickness direction of the second flange edge 322 and the thickness direction of the body portion 321 can be set at an acute angle, a right angle, or an obtuse angle.

[0331] In this embodiment, by setting the second flange edge 322 of the second side wall panel 32, which is used to connect with the first side wall panel 22, to be stacked with the first side wall panel 22 along the first direction X, the stacking direction of the second flange edge 322 and the first side wall panel 22 is consistent with the thickness direction of the second flange edge 322 and the same as the closing direction of the first box body 20 and the second box body 30. This facilitates the stacking and connection of the second flange edge 322 and the first side wall panel 22, which helps to reduce the assembly difficulty between the first side wall panel 22 and the second side wall panel 32, and can improve the connection reliability between the first side wall panel 22 and the second side wall panel 32.

[0332] In some embodiments, see Figure 14 As shown, the second flange edges 322 of multiple second sidewall plates 32 are connected end to end in sequence.

[0333] In this embodiment, by setting the second flange edges 322 of the multiple second side wall panels 32 to be connected end to end, the second flange edges 322 of the multiple second side wall panels 32 form an integral structure and a ring structure extending circumferentially along the top plate 31. This not only improves the overall structural strength of the second box body 30, but also effectively improves the assembly reliability between the second box body 30 and the first box body 20.

[0334] According to some embodiments of this application, refer to Figure 15 and Figure 17 Please refer to further details. Figure 18 As shown, Figure 18 for Figure 17 The diagram shows a partial enlarged view of point D on the first box body. The first side wall panel 22 may include a panel body 223 and a flange 224. The panel body 223 is connected to the support plate 21 and protrudes from the support surface 211. The flange 224 is connected to the end of the panel body 223 away from the support plate 21, and the thickness direction of the flange 224 is parallel to the first direction X. The flange 224 and the second flange edge 322 are stacked and connected along the first direction X.

[0335] The first sidewall panel 22 is bent to form a panel body 223 and a flange 224. The panel body 223 is connected between the flange 224 and the bearing plate 21. The thickness direction of the flange 224 is parallel to the first direction X, so that the thickness direction of the flange 224 is consistent with the thickness direction of the second flange edge 322, so that the flange 224 and the second flange edge 322 are stacked and connected along the first direction X.

[0336] For example, the body 223 and the flange 224 of the first side panel 22 are integrally formed.

[0337] In this embodiment, the first sidewall panel 22 includes a plate body 223 and a flange portion 224 connected to each other. The plate body 223 is connected to the bearing plate 21 and protrudes from the bearing surface 211. The thickness direction of the flange portion 224 is parallel to the first direction X, so that the cross-section of the first sidewall panel 22 is a bent "L" shaped structure. By setting the flange portion 224 of the first sidewall panel 22 in a structure that is stacked and connected to the second flange edge 322 along the first direction X, the assembly difficulty between the first box body 20 and the second box body 30 can be reduced, and the contact area between the first box body 20 and the second box body 30 can be increased to improve the connection stability between the first box body 20 and the second box body 30.

[0338] In some embodiments, see Figure 17 and Figure 18 As shown, the first side wall panel 22 and the bearing plate 21 are integrally formed.

[0339] For example, the first box body 20 is made of metal. Correspondingly, the first side wall panel 22 and the bearing plate 21 of the first box body 20 can be manufactured by an integral molding process such as extrusion molding or stamping molding.

[0340] In this embodiment, by setting the first side wall panel 22 as an integrally formed structure with the support plate 21, on the one hand, the connection stability and reliability between the first side wall panel 22 and the support plate 21 can be improved, which helps to reduce the risk of the first side wall panel 22 and the support plate 21 separating during use, thereby improving the reliability of the first box body 20. On the other hand, it can reduce the difficulty of setting multiple first side wall panels 22 around the support plate 21, thereby reducing the molding difficulty of the first box body 20.

[0341] According to some embodiments of this application, see Figure 6 As shown, the battery device 100 also includes a buffer 80, which is disposed between the second side wall panel 32 and the battery cell 10.

[0342] The buffer 80 is a structure that is supported between the second side wall plate 32 and the battery cell 10 and serves to absorb the stress on the second side wall plate 32. For example, the material of the buffer 80 can be foam or rubber.

[0343] In some embodiments, during the assembly of the battery device 100, the buffer 80 may be attached to the side of the battery cell 10 facing the second sidewall panel 32, or the buffer 80 may also be attached to the side of the second sidewall panel 32 facing the battery cell 10.

[0344] In this embodiment, by providing a buffer 80 between the second side wall panel 32 and the battery cell 10, the buffer 80 can absorb at least a portion of the stress generated on the first housing body 20 during the process of transmitting the stress to the top plate 31 through the second side wall panel 32, thereby reducing the stress impact on the top plate 31 and further alleviating the deformation or bulging of the top plate 31 of the second housing body 30 during use.

[0345] In some embodiments, please continue to see Figure 6 As shown, the buffer 80 is supported between the second side wall panel 32 and the battery cell 10, and the second side wall panel 32 bulges in the direction away from the battery cell 10. That is, the buffer 80 is a structure that is pressed between the second side wall panel 32 and the battery cell 10, and the buffer 80 can provide the second side wall panel 32 with a supporting force away from the battery cell 10, so as to arch the second side wall panel 32 in the direction away from the battery cell 10 along the third direction Y.

[0346] In this embodiment, by setting the buffer 80 to be supported between the second side wall panel 32 and the battery cell 10 and lifting the second side wall panel 32 away from the battery cell 10, the buffer 80 can better absorb the stress on the second side wall panel 32, and the second side wall panel 32 is a pre-deformed structure so that at least part of the stress can be released on the second side wall panel 32, thereby further reducing the stress on the top plate 31 and further alleviating the deformation or bulging of the top plate 31 of the second box body 30 during use.

[0347] Please see Figure 19 As shown, Figure 19 This is a cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to a second direction. According to some embodiments of this application, the top plate 31 is provided with a reinforcing portion 314, which is configured to enhance the bending strength of the top plate 31. That is, the top plate 31 has a structure in which a portion of its area is provided with the reinforcing portion 314, such that the area of ​​the top plate 31 with the reinforcing portion 314 is an area with enhanced bending strength, thereby increasing the overall bending strength of the top plate 31. It should be noted that the reinforcing portion 314 and the top plate 31 can be an integrally formed structure, i.e., the reinforcing portion 314 is part of the top plate 31. Alternatively, the reinforcing portion 314 and the top plate 31 can be separate structures, i.e., the reinforcing portion 314 is a component connected to the top plate 31.

[0348] By providing a reinforcing part 314 on the top plate 31 of the second housing body 30, and the reinforcing part 314 can enhance the bending strength of the top plate 31, the top plate 31 of the second housing body 30 is a structure in which the bending strength of at least a part of the area is enhanced. The second housing body 30 with this structure can enhance the ability of the top plate 31 of the second housing body 30 to resist the stress transmitted to the second housing body 30 by the first housing body 20. This can effectively alleviate the deformation or bulging of the top plate 31 of the second housing body 30 due to stress during use, which is conducive to extending the service life of the battery device 100 and reducing the safety hazards of the battery device 100 during use, thus improving the service life and reliability of the battery device 100.

[0349] According to some embodiments of this application, along the first direction X, the reinforcing part 314 protrudes from the surface of one side of the top plate 31, that is, the reinforcing part 314 is a structure connected to the surface of one side of the top plate 31.

[0350] In this embodiment, by protruding a reinforcing part 314 on the surface of the top plate 31 along the first direction X, the area of ​​the top plate 31 with the protruding reinforcing part 314 is a region with enhanced bending strength, which is simple in structure and easy to implement.

[0351] In some embodiments, the reinforcing part 314 can be integrally formed with the top plate 31, that is, the reinforcing part 314 is part of the top plate 31. Correspondingly, if the second box body 30 is made of metal, the reinforcing part 314 and the top plate 31 can be manufactured by integral forming processes such as extrusion molding, stamping molding or casting. If the second box body 30 is made of non-metallic material, the reinforcing part 314 and the top plate 31 can be manufactured by integral forming processes such as injection molding.

[0352] In this embodiment, by setting the reinforcing part 314 and the top plate 31 as an integrally formed structure, the connection stability and reliability between the reinforcing part 314 and the top plate 31 can be effectively improved, which helps to reduce the risk of the reinforcing part 314 detaching from the top plate 31 during use. Moreover, by adopting this integrally formed structure, the bending strength of the top plate 31 can be better enhanced by the reinforcing part 314.

[0353] Of course, in the embodiment where the reinforcing part 314 protrudes from one side of the surface of the top plate 31, the second box body 30 can also be other structures. For example, the reinforcing part 314 and the top plate 31 are separately provided and connected. That is, the reinforcing part 314 and the top plate 31 are two independent components, and the reinforcing part 314 is a structure connected to the surface of one side of the top plate 31 in the first direction X. Correspondingly, the reinforcing part 314 can be connected to the top plate 31 by means of adhesive bonding, welding connection or snap-fit ​​connection.

[0354] In this embodiment, by setting the reinforcing part 314 and the top plate 31 as separate structures, the difficulty of protruding the reinforcing part 314 on the top plate 31 can be reduced, thereby reducing the manufacturing difficulty of the second box body 30. Furthermore, it is possible to protrude reinforcing parts 314 of different materials on the top plate 31 to meet different usage scenarios and needs, which is beneficial to improving the applicability of the battery device 100.

[0355] According to some embodiments of this application, see Figure 7 , Figure 11 as well as Figure 18 As shown, a flow channel 212 is formed inside the support plate 21, which is used to contain the heat exchange medium. The support plate 21 is also configured to manage the temperature of the battery cell 10.

[0356] The heat exchange medium contained in the flow channel 212 of the support plate 21 can exchange heat with the battery cell 10, so that the support plate 21 can manage the temperature of the battery cell 10. It should be noted that the heat exchange medium contained in the flow channel 212 of the support plate 21 can be a variety of substances. For example, the heat exchange medium can be a gas, such as air or hydrogen, or a liquid, such as water, salt water solution or liquid nitrogen.

[0357] In this embodiment, by providing a flow channel 212 inside the support plate 21 for accommodating the heat exchange medium, the support plate 21 also has the function of heat exchange with the battery cell 10. Thus, the support plate 21 can not only support the battery cell 10, but also manage the temperature of the battery cell 10 during use. The components for managing the temperature of the battery cell 10 are integrated onto the support plate 21, thereby improving the internal space utilization of the battery device 100 while managing the temperature of the battery cell 10. This is beneficial for improving the reliability of the battery device 100 while taking into account the volumetric energy density of the battery device 100.

[0358] In some embodiments, see Figure 7 As shown, the battery device 100 may also include a heat-conducting element 90, which is disposed between the bearing surface 211 and the battery cell 10 along the first direction X.

[0359] For example, the material of the heat conductor 90 can be various, such as silicone, silicone grease or silicone rubber.

[0360] In this embodiment, by providing a heat-conducting element 90 between the battery cell 10 and the bearing surface 211 of the bearing plate 21, the heat-conducting element 90 can improve the heat transfer efficiency between the battery cell 10 and the bearing plate 21, thereby improving the effect of the bearing plate 21 in managing the temperature of the battery cell 10.

[0361] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0362] The electrical device can be any of the aforementioned devices or systems that utilize battery device 100.

[0363] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; The first box body is provided with a mounting structure. The first box body includes a support plate and a first side wall plate. The support plate has a support surface on one side in a first direction. The support surface is used to support the battery cell along the first direction. The first side wall plate is connected to the support plate and protrudes from the support surface. as well as The second housing body, together with the first housing body, defines an assembly space for accommodating the battery cell. The second housing body includes a top plate and a second side wall plate. The top plate and the support plate are arranged opposite to each other along the first direction. The second side wall plate is connected to the first side wall plate, and the end of the second side wall plate away from the support plate in the first direction is connected to the top plate. Along the first direction, the size of the first side wall plate protruding from the support surface is less than one-quarter of the maximum size of the second side wall plate. The top plate has a recess on the side opposite to the battery cell, and the recess includes a first arc-shaped wall surface.

2. The battery device according to claim 1, characterized in that, On the same projection plane perpendicular to the first direction, the area of ​​the top plate is S1, and the area of ​​the recess is S2, satisfying that 60% ≤ S1 / S2 < 100%.

3. The battery device according to claim 1, characterized in that, Along the second direction, the size of the recess is L1, and the size of the top plate is L2, satisfying that 80% ≤ L1 / L2 < 100%. The second direction is parallel to the length direction of the battery device and perpendicular to the first direction.

4. The battery device according to claim 1, characterized in that, Along a third direction, the size of the recess is W1, and the size of the top plate is W2, satisfying that 90% ≤ W1 / W2 < 100%. The third direction is parallel to the width direction of the battery device and perpendicular to the first direction.

5. The battery device according to claim 1, characterized in that, The top plate has a protrusion on the side facing the battery cell that corresponds to the recess, and the protrusion includes a second arc-shaped wall surface.

6. The battery device according to claim 1, characterized in that, Along the first direction, the maximum depth of the recess is H1, the thickness of the top plate is T, H1 and T satisfy 0.07≤T / H1≤5, and T satisfies 0.7mm≤T≤5mm, and H1 satisfies 1mm≤H1≤10mm.

7. The battery device according to claim 6, characterized in that, H1 and T satisfy 0.1≤T / H1≤2, and T satisfies 0.8mm≤T≤4mm, while H1 satisfies 2mm≤H1≤8mm.

8. The battery device according to claim 1, characterized in that, The depth of the recess gradually decreases from the center of the first arc-shaped wall to any edge of the first arc-shaped wall.

9. The battery device according to claim 1, characterized in that, Along the first direction, the maximum depth of the recess is H1, the elastic modulus of the top plate is E, H1 and E satisfy 0.001mm / GPa≤H1 / E≤10mm / GPa, and H1 satisfies 1mm≤H1≤10mm, and E satisfies 1GPa≤E≤1000GPa.

10. The battery device according to claim 9, characterized in that, H1 and E satisfy 0.2mm / GPa≤H1 / E≤8mm / GPa, and H1 satisfies 2mm≤H1≤8mm, and E satisfies 1GPa≤E≤10GPa.

11. The battery device according to claim 9, characterized in that, H1 and E satisfy 0.0067mm / GPa≤H1 / E≤0.08mm / GPa, and H1 satisfies 2mm≤H1≤8mm, and E satisfies 100GPa≤E≤300GPa.

12. The battery device according to claim 9, characterized in that, The top plate is made of plastic, resin fiber composite material, or alloy.

13. The battery device according to claim 1, characterized in that, The dimension of the top plate along the second direction is L2, and the dimension of the top plate along the third direction is W2, which satisfies 1≤L2 / W2≤8.

14. The battery device according to claim 1, characterized in that, The top plate and the second side wall plate are integrally formed.

15. The battery device according to any one of claims 1-14, characterized in that, The first box body includes two first side wall panels arranged opposite each other along a third direction, and the second box body includes two second side wall panels arranged opposite each other along a third direction, with each second side wall panel connected to one of the first side wall panels; The first box body also includes two third side wall panels arranged opposite each other along the second direction. The two third side wall panels are connected to the side of the support plate facing the top plate. The two third side wall panels are located at both ends of the second box body in the second direction. The top plate and the two second side wall panels are connected to the third side wall panels. The first direction, the second direction and the third direction are perpendicular to each other.

16. The battery device according to claim 15, characterized in that, The second box body is provided with a first flange at both ends in the second direction, and the first flange connects the top plate and the two second side wall plates; The third sidewall plate is connected to the first flange edge at both ends in the third direction and at the end of the third sidewall plate away from the bearing plate in the first direction.

17. The battery device according to claim 16, characterized in that, The first flange edge includes a first segment and two second segments. The first segment is connected to the top plate, and the end of the third sidewall plate away from the bearing plate in the first direction is connected to the first segment. The two second segments are respectively connected to two second sidewall plates, and the two ends of the third sidewall plate in the third direction are respectively connected to the two second segments. The first flange edge further includes an arc segment, and each second segment is connected to the first segment through one of the arc segments.

18. The battery device according to claim 17, characterized in that, The first segment and the top plate are connected by a connecting part; The top plate has a first inner surface facing the support plate in the first direction, and the first segment has a second inner surface facing the support plate in the first direction. The second inner surface abuts against the third side wall plate, and the second inner surface and the first inner surface are connected through the inner surface of the connecting portion. Along the first direction, the first inner surface is further away from the support plate than the second inner surface.

19. The battery device according to claim 18, characterized in that, The thickness of the first segment is greater than the thickness of the top plate.

20. The battery device according to claim 18, characterized in that, Along the second direction, the dimension of the first flange edge is L3, which satisfies 20mm≤L3≤35mm.

21. The battery device according to claim 20, characterized in that, 22mm≤L3≤28mm.

22. The battery device according to claim 16, characterized in that, The second sidewall panel has a second flange edge connected to the first sidewall panel at the end away from the top plate in the first direction, and the second flange edge of each second sidewall panel is connected to two first flange edges at both ends in the second direction.

23. The battery device according to claim 16, characterized in that, The battery device also includes: A first sealing element is disposed between the first flange edge and the third sidewall plate to seal the gap between the first flange edge and the third sidewall plate.

24. The battery device according to claim 15, characterized in that, The second sidewall panel has a second flange edge connected to the first sidewall panel at the end away from the top plate in the first direction. The thickness direction of the second flange edge is parallel to the third direction, and the second flange edge and the first sidewall panel are stacked along the third direction.

25. The battery device according to claim 24, characterized in that, Along the third direction, the first sidewall plate is located on the side of the second flange facing the assembly space.

26. The battery device according to claim 15, characterized in that, The first side wall panel and the supporting plate are separately arranged but connected.

27. The battery device according to claim 15, characterized in that, The third sidewall panel is detachably connected to the support plate.

28. The battery device according to claim 15, characterized in that, The first box body also includes: A reinforcing member is disposed on the side of the supporting plate facing the top plate. The reinforcing member extends along the third direction, and the two ends of the reinforcing member in the third direction are respectively connected to the two first side wall plates.

29. The battery device according to claim 28, characterized in that, The first housing body includes two reinforcing members, which are arranged at intervals along the second direction, and the battery cell is disposed between the two reinforcing members along the second direction.

30. The battery device according to any one of claims 1-14, characterized in that, The first box body includes a plurality of first side wall panels, which surround the bearing plate and are connected end to end in sequence. The second box body includes a plurality of second side wall panels, which surround the top plate and are connected end to end in sequence, with each second side wall panel connected to a first side wall panel.

31. The battery device according to claim 30, characterized in that, The second sidewall panel has a second flange edge connected to the first sidewall panel at the end away from the top plate in the first direction. The thickness direction of the second flange edge is parallel to the first direction, and the second flange edge and the first sidewall panel are stacked along the first direction.

32. The battery device according to claim 31, characterized in that, The second flange edges of multiple second sidewall plates are connected end to end in sequence.

33. The battery device according to claim 31, characterized in that, The first sidewall panel includes a panel body and a flange portion. The panel body is connected to the support plate and protrudes from the support surface. The flange portion is connected to the end of the panel body away from the support plate, and the thickness direction of the flange portion is parallel to the first direction. The flange portion is stacked and connected to the second flange edge along the first direction.

34. The battery device according to claim 30, characterized in that, The first side wall panel and the bearing plate are integrally formed.

35. The battery device according to claim 1, characterized in that, The battery device also includes: A buffer is disposed between the second sidewall panel and the battery cell.

36. The battery device according to claim 35, characterized in that, The buffer is supported between the second sidewall panel and the battery cell, and the second sidewall panel bulges in a direction away from the battery cell.

37. The battery device according to claim 1, characterized in that, The top plate is provided with a reinforcing part, which is configured to enhance the bending strength of the top plate.

38. The battery device according to claim 37, characterized in that, Along the first direction, the reinforcing part protrudes from the surface of one side of the top plate.

39. The battery device according to claim 1, characterized in that, The support plate has internal channels for containing heat exchange medium, and the support plate is also configured to manage the temperature of the battery cells.

40. The battery device according to claim 39, characterized in that, The battery device further includes a heat-conducting element, which is disposed between the bearing surface and the battery cell along the first direction.

41. An electrical appliance, characterized in that, The battery device includes any one of claims 1-40, the battery device being used to provide electrical energy.

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