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 to support the battery cell. The first side wall plate is connected to the bearing plate and protrudes from the bearing surface. The second box body and the first box body jointly define an assembly space for accommodating the battery cell. The second box body comprises a top plate and a second side wall plate. The top plate and the bearing plate are oppositely arranged along the first direction. The second side wall plate is connected to the first side wall plate. An end of the second side wall plate away from the bearing plate in the first direction is connected to the top plate. 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. A buffer is arranged between the second side wall plate and the battery cell. 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 buffer is provided between the second side wall plate and the battery cell.

[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 with a target component, so that the support plate of the first housing body supports and carries the battery cells, and facilitates the assembly of the battery device onto the target component for power supply. By making the dimension of the first side wall panel protruding from the support surface less than one-quarter of the maximum dimension of the second side wall panel, the dimension of the first side wall panel for assembly with the second housing body is smaller, which is beneficial for optimizing the first housing body in the first direction. The dimensions are optimized to reduce the binding force of the first box body on the second box body, thereby reducing the assembly difficulty between the first box body and the target component. By setting a buffer between the second side wall panel and the battery cell, the buffer can absorb at least part of the stress on the second side wall panel during the transmission of stress generated on the first box body 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, helps extend the service life of the battery device, reduces safety hazards during use, and improves the service life and reliability of the battery device.

[0008] According to some embodiments of this application, the buffer is configured to be supported between the second sidewall panel and the battery cell, and the second sidewall panel bulges in a direction away from the battery cell.

[0009] 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.

[0010] According to some embodiments of this application, the material of the top plate is the same as that of the second side wall plate, and the elastic modulus of the buffer is less than that of the top plate.

[0011] In the above scheme, the material of the top plate is the same as that of the second side wall plate, and the material properties of the top plate are the same as those of the second side wall plate. The elastic modulus of the buffer is less than that of the top plate, and the buffer can better absorb the stress on the second side wall plate so that at least part of the stress can be released on the second side wall plate, 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.

[0012] According to some embodiments of this application, the top plate and the second side wall plate are integrally formed.

[0013] 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.

[0014] According to some embodiments of this application, the cushioning element is made of foam material.

[0015] In the above scheme, the foamed material has a low density and high strength, which makes it easy to reduce weight and save materials.

[0016] According to some embodiments of this application, there are multiple battery cells, which are stacked along a second direction, which is perpendicular to the first direction; the buffer extends along the second direction.

[0017] In the above scheme, multiple battery cells are stacked along the second direction. The contact area between the buffer and the multiple battery cells in the second direction can be designed to be large so that the buffer can be supported by the multiple battery cells. By setting the buffer to extend along the second direction, the buffer has a large contact area with the second side wall in the second direction, which is beneficial for the buffer to absorb the stress on the second side wall.

[0018] According to some embodiments of this application, there are multiple battery cells, which are stacked along a second direction perpendicular to the first direction; there are also multiple buffers, which are spaced apart along the second direction.

[0019] In the above scheme, multiple battery cells are stacked along the second direction. The contact area between the buffer and the multiple battery cells in the second direction can be designed to be large so that the buffer can be supported by the multiple battery cells. By arranging multiple buffers at intervals along the second direction, the second side wall can be buffered at multiple positions in the second direction, which is beneficial for the buffer to absorb the stress on the second side wall.

[0020] According to some embodiments of this application, the second sidewall panel includes a body portion, a transition portion, and a first flange edge. The transition portion connects the top plate and the body portion, and the first flange edge is disposed at the end of the body portion away from the transition portion. The first flange edge is connected to the first sidewall panel.

[0021] In the above scheme, a first flange edge is provided at the end of the main body that is away from the transition part, and the first flange edge is connected to the first side wall plate to facilitate the assembly of the second side wall plate and the first side wall plate.

[0022] According to some embodiments of this application, a buffer is disposed between the body and the battery cell.

[0023] In the above scheme, the main body is more susceptible to stress deformation than the first flange edge. The buffer is set between the main body and the battery cell, which helps the buffer absorb the stress on the main body and allows the buffer to better absorb the stress on the second side wall, thereby reducing the stress impact on the top plate.

[0024] According to some embodiments of this application, the buffer is bonded to the body and / or the battery cell.

[0025] In the above solution, the buffer is bonded to the main body and / or the battery cell so that the buffer can be fixed to the main body and / or the battery cell, reducing the risk of the buffer moving relative to the main body and / or the battery cell, so as to absorb the stress on the main body through the buffer, thereby enabling the buffer to better absorb the stress on the second side wall.

[0026] According to some embodiments of this application, along the first direction, the distance between the buffer and the top plate is less than the distance between the buffer and the bearing surface.

[0027] In the above scheme, the distance between the buffer and the top plate is less than the distance between the buffer and the bearing surface. When the stress on the second side wall is transmitted to the top plate from the end closest to the bearing surface, the second side wall itself can first absorb a certain amount of stress and deform. Then, the buffer absorbs part of the stress, which can weaken the stress transmitted to the intersection of the second side wall and the top plate. By strengthening the structure at the intersection of the second side wall and the top plate to absorb part of the stress, the stress transmitted to the top plate is greatly reduced, thereby reducing the stress impact on the top plate and further alleviating the phenomenon of deformation or bulging of the top plate during use.

[0028] According to some embodiments of this application, the distance between the second sidewall and the battery cell gradually decreases along the direction from the support plate to the top plate.

[0029] In the above scheme, the distance between the second side wall panel and the battery cell gradually decreases along the direction from the bearing plate to the top plate. The second side wall panel is inclined, which makes it easier for the second side wall panel to release some stress through its own deformation. Combined with the buffer to absorb some of the stress on the second side wall panel, the stress transmitted from the second side wall panel to the top plate is greatly reduced, thereby reducing the stress on the top plate and further alleviating the phenomenon of deformation or bulging of the top plate during use.

[0030] According to some embodiments of this application, along a third direction, a buffer is disposed between the second sidewall panel and the battery cell, and on the same projection plane perpendicular to the third direction, the orthographic projection of the buffer does not overlap with the orthographic projection of the first sidewall panel.

[0031] In the above scheme, the second side wall panel, the buffer and the battery cell are arranged along the third direction. The buffer can deform in the third direction to absorb the stress on the second side wall panel. With the third direction as the projection direction, the orthographic projection of the buffer does not overlap with the orthographic projection of the first side wall panel. The buffer is directly connected to the second side wall panel and the battery cell, which is conducive to the buffer absorbing the stress on the second side wall panel and reducing the stress impact on the top plate.

[0032] According to some embodiments of this application, the second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in a first direction, and the first flange edge and the first sidewall panel are stacked together; wherein, the battery device further includes a first sealing member, which is disposed between the first sidewall panel and the first flange edge to seal the gap between the first sidewall panel and the first flange edge.

[0033] In the above scheme, the end of the second side wall panel away from the top plate in the first direction is formed with a first flange edge that is stacked and connected to the first side wall panel. By providing a first sealing element between the first flange edge and the first side wall panel, the first sealing element can seal the gap between the first flange edge and the first side wall panel, 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 first side wall panel during use, thereby improving the reliability and service life of the battery device.

[0034] According to some embodiments of this application, the first sidewall panel and the first flange edge do not contact each other, and along the stacking direction of the first sidewall panel and the first flange edge, the first flange edge abuts against the first sidewall panel through the first sealing member.

[0035] In the above scheme, by setting the first side wall plate and the first flange edge to be indirectly abutted by the first seal, the first seal can also play a certain buffering role between the first side wall plate and the first flange edge. When the first box body is deformed due to the torque generated by the target component during use, the stress generated by the deformation of the first box body can be absorbed and released by the first seal during the process of being transmitted through the first side wall plate to the first flange edge of the second side wall plate. This can reduce the stress impact on the second box body and further alleviate the deformation or bulging of the top plate of the second box body during use.

[0036] According to some embodiments of this application, the battery device further includes a first locking member, which passes through the first seal and locks the first flange edge and the first side wall plate.

[0037] In the above scheme, the battery device is also provided with a first locking member that passes through the first seal and locks the first flange edge and the first side wall plate, so that the first flange edge and the first side wall plate are connected to each other through the first locking member, and the first flange edge and the first side wall plate are tightly abutted against the first seal. This can improve the sealing effect of the first seal on the gap between the first flange edge and the first side wall plate, and at the same time facilitate the first seal to absorb the stress transmitted from the first side wall plate to the first flange edge of the second side wall plate.

[0038] According to some embodiments of this application, along the stacking direction of the first sidewall panel and the first flange edge, the surface of the first flange edge facing the first sidewall panel is provided with an abutment portion, which directly abuts against the first sidewall panel; wherein, in the projection plane perpendicular to the stacking direction of the first sidewall panel and the first flange edge, the orthographic projection of the abutment portion and the orthographic projection of the first sealing element do not overlap.

[0039] In the above solution, by providing an abutment portion that directly abuts against the first side wall plate on the surface of the first flange edge facing the first side wall plate, and by ensuring that the projection of the abutment portion in the stacking direction of the first side wall plate and the first flange edge does not overlap with the projection of the first seal in the stacking direction of the first side wall plate and the first flange edge, the abutment portion is designed to directly contact the first side wall plate and be misaligned with the first seal. Battery devices with this structure can reduce the damage or destruction to the first seal caused by the mutual squeezing of the abutment portion and the first side wall plate, which is beneficial to improving the service life and sealing reliability of the first seal.

[0040] According to some embodiments of this application, the battery device further includes a first locking member, a locking abutment portion of the first locking member, and a first sidewall plate.

[0041] In the above solution, locking the abutment part and the first side wall plate with the first locking member can achieve the connection between the first flange edge and the first side wall plate, and can ensure that the abutment part of the first flange edge is tightly abutted against the first side wall plate, so as to reduce the damage to the first seal caused by the slippage or misalignment of the abutment part and the first side wall plate.

[0042] According to some embodiments of this application, in the projection plane perpendicular to the stacking direction of the first sidewall and the first flange edge, the orthographic projection of the first seal and the orthographic projection of the bearing plate do not overlap.

[0043] In the above solution, by setting the orthographic projection of the first seal in the projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge to not overlap with the orthographic projection of the bearing plate in the projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge, the first seal and the bearing plate do not have an overlapping relationship in the stacking direction of the first side wall plate and the first flange edge. This reduces the phenomenon that the stress on the bearing plate in the stacking direction of the first side wall plate and the first flange edge is directly applied to the first seal through the first side wall plate, thereby reducing the risk of damage or failure of the first seal during use and improving the service life and sealing reliability of the first seal.

[0044] According to some embodiments of this application, along the stacking direction of the first sidewall panel and the first flange edge, a limiting portion is protruded from the surface of the first sidewall panel facing the first flange edge or the surface of the first flange edge facing the first sidewall panel, and the limiting portion and the abutting portion are spaced apart; wherein, the first sealing member is located between the limiting portion and the abutting portion.

[0045] In the above solution, a limiting part is provided on the surface of the first side wall plate facing the first flange edge or on the surface of the first flange edge facing the first side wall plate, and the first sealing element is a structure disposed between the limiting part and the abutting part, so that the limiting part and the abutting part can cooperate to play a certain assembly limiting role for the first sealing element, thereby reducing the phenomenon of the first sealing element detaching or falling off from the first flange edge and the first side wall plate during use, which is beneficial to improving the assembly stability and sealing reliability of the first sealing element.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] According to some embodiments of this application, at least a portion of the top plate bulges toward the battery cell along a first direction to form a recessed area on the side of the top plate opposite to the battery cell.

[0051] In the above scheme, by setting at least a portion of the top plate to bulge towards the battery cell, so that the side of the top plate away from the battery cell in the first direction is recessed towards the battery cell and forms a pre-deformed structure, the bulging phenomenon or bulging amplitude of the top plate can be reduced to a certain extent when the top plate is affected by bending moment or stress during use and bulges in the first direction away from the battery cell.

[0052] According to some embodiments of this application, the first sidewall panel and the second sidewall panel do not contact each other, and a first sealing member is sandwiched between the first sidewall panel and the second sidewall panel. The battery device also includes a first locking member, which passes through the first sealing member and locks the first sidewall panel and the second sidewall panel.

[0053] In the above scheme, the first side wall panel and the second side wall panel do not contact each other, and a first sealing element is sandwiched between the first side wall panel and the second side wall panel, so that the first side wall panel and the second side wall panel are indirectly abutted by the first sealing element. The first locking element is a structure that passes through the first sealing element and connects the first side wall panel and the second side wall panel, so that the first side wall panel and the second side wall panel are locked by the first locking element and abutted against the first sealing element. In this way, while realizing the assembly and connection of the first side wall panel and the second side wall panel, the first sealing element can also play a certain buffering and separation role between the first side wall panel and the second side wall panel. This allows the first sealing element to absorb and release the stress generated by the deformation of the first box body during use, thereby reducing the stress transmitted from the first side wall panel of the first box body to the second side wall panel of the second box body. In turn, it can reduce the stress impact on the top plate of the second box body, thereby alleviating the deformation or bulging of the top plate of the second box body during use. This is beneficial to extending the service life of the battery device and reducing the safety hazards of the battery device during use, thus improving the service life and reliability of the battery device.

[0054] 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.

[0055] 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.

[0056] According to some embodiments of this application, the second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in a first direction. The thickness direction of the first flange edge is parallel to the third direction, and the first flange edge and the first sidewall panel are stacked along the third direction.

[0057] In the above scheme, by setting the first 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 first flange edge and the first side wall plate is consistent with the thickness direction of the first 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.

[0058] According to some embodiments of this application, along a third direction, the first sidewall is located on the side of the first flange facing the assembly space.

[0059] In the above scheme, by setting the first side wall panel to be located on the side of the first 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, which facilitates 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.

[0060] According to some embodiments of this application, the second box body is provided with second flange edges at both ends in the second direction, and the second 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 second flange edges.

[0061] In the above scheme, by setting a second 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 second 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 second flange edge, thereby reducing the assembly difficulty between the third side wall plate and the second box body.

[0062] According to some embodiments of this application, the second 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 the 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 second flange edge also includes an arc segment, and each second segment is connected to the first segment through an arc segment.

[0063] In the above scheme, by connecting the first section where the second flange edge connects to the top plate and the second section where the second flange edge connects to the second side wall plate with an arc segment, the area where the second flange edge connects to the top plate and the area where the second flange edge connects to the second side wall plate has an arc transition structure. This reduces the occurrence of sharp corners at the connection position of the second flange edge at the top plate and the second side wall plate. On the one hand, this facilitates the assembly and connection between the second flange edge and the third side wall plate, reducing the assembly difficulty between the second flange edge and the third side wall plate. On the other hand, it alleviates the stress concentration phenomenon at the connection position of the second flange edge at the top plate and the second side wall plate, thereby reducing the risk of damage or cracking of the second flange edge during use.

[0064] 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.

[0065] In the above scheme, the first section of the second 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 second 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 second 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.

[0066] 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 first flange edge connected to the first sidewall panel, and the two ends of the first flange edge of each second sidewall panel in the second direction are respectively connected to two second flange edges.

[0067] In the above scheme, by connecting the two ends of the first flange edge of the second side wall plate in the second direction to the two second flange edges located at the two ends of the top plate in the second direction, the first flange edge and the second 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.

[0068] According to some embodiments of this application, the battery device further includes a second seal disposed between the second flange edge and the third sidewall plate to seal the gap between the second flange edge and the third sidewall plate.

[0069] In the above scheme, by setting a second sealing element between the second flange edge and the third side wall plate, the second sealing element can seal the gap between the second 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 second flange edge and the third side wall plate during use, thereby improving the reliability and service life of the battery device.

[0070] According to some embodiments of this application, the first sidewall panel and the load-bearing plate are separately disposed but connected.

[0071] 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.

[0072] According to some embodiments of this application, the third sidewall panel is detachably connected to the support plate.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 first flange edge connected to the first sidewall panel. The thickness direction of the first flange edge is parallel to the first direction, and the first flange edge and the first sidewall panel are stacked along the first direction.

[0081] In the above scheme, by setting the first 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 first flange edge and the first side panel is consistent with the thickness direction of the first 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 first 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.

[0082] According to some embodiments of this application, the first flange edges of a plurality of second sidewall plates are connected end to end in sequence.

[0083] In the above scheme, by setting the first flange edges of multiple second side wall panels to be connected end to end, the first 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.

[0084] 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 first flange are stacked and connected along the first direction.

[0085] 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 first 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.

[0086] According to some embodiments of this application, the first sidewall panel and the load-bearing plate are integrally formed.

[0087] 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.

[0088] According to some embodiments of this application, the interior of the carrier plate is formed with flow channels for containing heat exchange medium, and the carrier plate is also configured to manage the temperature of the battery cells.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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, the following are specific embodiments of this application. Attached Figure Description

[0094] 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.

[0095] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0096] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0097] Figure 3 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0098] 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;

[0099] 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;

[0100] Figure 6 Cross-sectional views of a battery device provided for some embodiments of this application;

[0101] Figure 7 for Figure 6 A partial enlarged view of point A of the battery device shown;

[0102] 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;

[0103] Figure 9 for Figure 6 A partial enlarged view of point B of the battery device shown;

[0104] Figure 10 A schematic diagram of a portion of the structure of a battery device provided in some embodiments of this application;

[0105] Figure 11 Cross-sectional views of the battery device provided for some embodiments of this application in other embodiments;

[0106] Figure 12 for Figure 11 A partial enlarged view of point C of the battery device shown;

[0107] Figure 13 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;

[0108] Figure 14 A cross-sectional view of the second housing body of the battery device provided in some embodiments of this application, perpendicular to the second direction;

[0109] Figure 15 A cross-sectional view of the second housing body of a battery device provided in other embodiments of this application, perpendicular to the second direction;

[0110] Figure 16 for Figure 15 A magnified view of point D on the second box body shown;

[0111] Figure 17 A schematic diagram of the structure of a battery device provided in some further embodiments of this application;

[0112] Figure 18 Exploded views of the structure of the battery device provided in some further embodiments of this application;

[0113] Figure 19 A schematic diagram of the structure of the second housing body of the battery device provided in some further embodiments of this application;

[0114] Figure 20 A schematic diagram of the structure of the first housing body of the battery device provided in some further embodiments of this application;

[0115] Figure 21 A cross-sectional view of the second housing body of the battery device provided in some further embodiments of this application, perpendicular to the second direction;

[0116] Figure 22 A cross-sectional view of the first housing body of the battery device provided in some further embodiments of this application, perpendicular to the second direction;

[0117] Figure 23 for Figure 22 A magnified view of a portion of the first box body at point E.

[0118] 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 - Reinforcing Member; 3111 - First Reinforcing Member; 3112 - Second Reinforcing Member; 312 - Groove; 313 - Body Layer; 314 - Connecting Layer; 315 - First Inner Surface; 316 - Recessed area; 32 - Second sidewall panel; 321 - Body part; 322 - First flange edge; 3221 - Abutting part; 323 - Transition part; 33 - Second 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 sealing element; 60 - First locking element; 70 - Buffer element; 80 - Second locking element; 90 - Heat conducting element; 200 - Controller; 300 - Motor; X - First direction; Y - Third direction; Z - Second direction. Detailed Implementation

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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).

[0126] 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.

[0127] 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.

[0128] 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.

[0129] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0130] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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 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 buffer is provided between the second side wall plate and the battery cell.

[0137] In this battery device structure, 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 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 panel protruding from the support surface less than one-quarter of the maximum dimension of the second side wall panel, the size of the first side wall panel 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 impact of the first housing body on the second housing body. The binding force of the main body reduces the assembly difficulty between the first box body and the target component, and also reduces the difficulty of assembling the battery cells onto the support plate, thereby reducing the assembly difficulty of the battery device. In particular, by setting a buffer between the second side wall panel and the battery cells, the buffer can absorb at least part 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 the deformation or bulging of the top plate of the second box body during use, helps extend the service life of the battery device, reduces safety hazards during use, and improves the service life and reliability of the battery device.

[0138] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The power system of such an electrical device can be composed using the battery device disclosed in this application. This helps to alleviate the problem of deformation or bulging of the battery device casing during use, thereby improving the service life and reliability of the battery device.

[0139] 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.

[0140] 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.

[0141] Please refer to Figure 1 , Figure 1 This 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.

[0142] 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.

[0143] 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.

[0144] Please refer to 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 the battery device provided in some embodiments of this application, perpendicular to a third direction. Figure 9 for Figure 6The image shows a partial enlarged view of section B of the battery device. 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 buffer member 70 is provided between the second side wall plate 32 and the battery cell 10.

[0145] 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.

[0146] 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 box body 40 formed by the first box body 20 and the second box body 30 is a cuboid. Correspondingly, the height direction of the box body 40 is the first direction X, the width direction of the box body 40 is the third direction Y, and the length direction of the box body 40 is the second direction Z.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] For example, in Figure 7 In the process, the first side wall panel 22 and the support plate 21 are separate structures. One end of the support plate 21 in the third direction Y 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.

[0157] 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.

[0158] Among them, see Figure 3 , Figure 6 and Figure 9 As shown, the buffer 70 is a structure supported between the second side wall panel 32 and the battery cell 10 and serves to absorb stress on the second side wall panel 32. For example, the material of the buffer 70 can be foam or rubber, etc.

[0159] In some embodiments, during the assembly of the battery device 100, the buffer 70 may be attached to the side of the battery cell 10 facing the second sidewall panel 32, or the buffer 70 may also be attached to the side of the second sidewall panel 32 facing the battery cell 10.

[0160] 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, which is beneficial to optimizing the size of the first housing body 20. The dimensions of body 20 in the first direction X are reduced, and the binding force of the first box body 20 on the second box body 30 is reduced, thereby reducing the assembly difficulty between the first box body 20 and the target part, and reducing the difficulty of assembling the battery cell 10 onto the support plate 21, thus reducing the assembly difficulty of the battery device 100. In this case, by providing a buffer 70 between the second side wall plate 32 and the battery cell 10, the buffer 70 can absorb at least a portion of the stress generated on the first box body 20 during the process of transmitting the stress to the top plate 31 through the second side wall plate 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 box body 30 during use.

[0161] In some embodiments, please continue to see Figure 6 and Figure 9 As shown, the buffer 70 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 70 is a structure that is pressed between the second side wall panel 32 and the battery cell 10, and the buffer 70 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.

[0162] In this embodiment, by setting the buffer 70 as a structure that supports the second side wall panel 32 and the battery cell 10 and lifts the second side wall panel 32 away from the battery cell 10, the buffer 70 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.

[0163] According to some embodiments of this application, the material of the top plate 31 is the same as that of the second side wall plate 32, and the elastic modulus of the buffer 70 is less than that of the top plate 31.

[0164] 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.

[0165] In the above scheme, the material of the top plate 31 is the same as that of the second side wall plate 32, and the material properties of the top plate 31 are the same as those of the second side wall plate 32. The elastic modulus of the buffer 70 is less than that of the top plate 31. The buffer 70 can better absorb the stress on the second side wall plate 32 so that at least part of the stress can be released on the second side wall plate 32, thereby further reducing the stress impact 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.

[0166] 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.

[0167] 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 are integral structures formed by injection molding.

[0168] 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.

[0169] According to some embodiments of this application, the buffer 70 is made of foam material.

[0170] For example, foamed materials may include foamed rubber, such as foamed polypropylene, melamine, etc.

[0171] In the above scheme, the foamed material has a low density and high strength, which makes it easy to reduce weight and save materials.

[0172] Please see Figure 3 As shown, according to some embodiments of this application, there are multiple battery cells 10, and the multiple battery cells 10 are stacked along the second direction Z, which is perpendicular to the first direction X; the buffer 70 extends along the second direction Z.

[0173] In the embodiment where the buffer 70 is supported between the battery cell 10 and the second side wall panel 32, the buffer 70 absorbs the stress of the second side wall panel 32 through the support provided by the battery cell 10. Therefore, the larger the contact area between the buffer 70 and the battery cell 10, the larger the contact area between the buffer 70 and the second side wall panel 32, and the better the stress absorption effect of the buffer 70 on the second side wall panel 32.

[0174] Meanwhile, multiple battery cells 10 are stacked along the second direction Z, enabling the battery device 100 to have a high capacity.

[0175] In the above scheme, multiple battery cells 10 are stacked along the second direction Z. The contact area between the buffer member 70 and the multiple battery cells 10 in the second direction Z can be designed to be large so that the buffer member 70 can be supported by the multiple battery cells 10. By setting the buffer member 70 to extend along the second direction Z, the buffer member 70 has a large contact area with the second side wall plate 32 in the second direction Z, which is beneficial for the buffer member 70 to absorb the stress on the second side wall plate 32.

[0176] Please see Figure 10 As shown, Figure 10 This is a schematic diagram of a partial structure of a battery device provided in some embodiments of this application. According to some embodiments of this application, there are multiple battery cells 10, which are stacked along a second direction Z, and the second direction Z is perpendicular to the first direction X; there are multiple buffer members 70, which are spaced apart along the second direction Z.

[0177] Multiple buffer members 70 are spaced apart along the second direction Z. Each buffer member 70 can extend along the second direction Z so that the whole composed of multiple buffer members 70 has a large contact area with the second side wall plate 32, which is beneficial for the buffer members 70 to absorb the stress of the second side wall plate 32.

[0178] In the above scheme, multiple battery cells 10 are stacked along the second direction Z. The contact area between the buffer member 70 and the multiple battery cells 10 in the second direction Z can be designed to be large so that the buffer member 70 can be supported by the multiple battery cells 10. By arranging multiple buffer members 70 at intervals along the second direction Z, the second side wall plate 32 can be buffered at multiple positions in the second direction Z, which is beneficial for the buffer member 70 to absorb the stress on the second side wall plate 32.

[0179] According to some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 9 As shown, the second sidewall panel 32 includes a body portion 321, a transition portion 323 and a first flange edge 322. The transition portion 323 connects the top plate 31 and the body portion 321. The first flange edge 322 is disposed at one end of the body portion 321 away from the transition portion 323 and is connected to the first sidewall panel 22.

[0180] The main body 321 is connected to the top plate 31 via a transition portion 323. In embodiments where the second side wall panel 32 and the top plate 31 are integrally formed, the second side wall panel 32 and the top plate 31 can be stamped or injection molded. The transition portion 323 is located at the junction of the second side wall panel 32 and the top plate 31, and the transition portion 323 has high strength.

[0181] The wall thickness of the first flange edge 322 is greater than the wall thickness of the body part 321, so as to facilitate the connection between the second side wall plate 32 and the first side wall plate 22. When the first flange edge 322 and the first side wall plate 22 are fitted together, the first flange edge 322 and the first side wall plate 22 can be connected by bolts, which is simple to operate and has low assembly difficulty.

[0182] In the above scheme, a first flange edge 322 is provided at the end of the main body 321 away from the transition part 323, and the first side wall plate 22 is connected through the first flange edge 322, which facilitates the assembly of the second side wall plate 32 and the first side wall plate 22.

[0183] Please see Figure 9 As shown, according to some embodiments of this application, the buffer 70 is disposed between the body portion 321 and the battery cell 10.

[0184] The body portion 321 has a larger surface area than the first flange edge 322 and the transition portion 323, making it easier for the body portion 321 to deform and release the stress on the second side wall plate 32. At the same time, the body portion 321 has a larger contact area with the buffer member 70, which facilitates the buffer member 70 to absorb more stress on the second side wall plate 32.

[0185] In the above scheme, the main body 321 is more susceptible to stress deformation than the first flange edge 322. The buffer 70 is disposed between the main body 321 and the battery cell 10, which helps the buffer 70 absorb the stress on the main body 321, so that the buffer 70 can better absorb the stress on the second side wall plate 32, thereby reducing the stress impact on the top plate 31.

[0186] According to some embodiments of this application, the buffer 70 is bonded to the body portion 321 and / or the battery cell 10.

[0187] In the above scheme, the buffer 70 can be bonded to the main body 321, or the buffer 70 can be bonded to the battery cell 10, or the buffer 70 can be bonded to both the main body 321 and the battery cell 10, so that the buffer 70 can be fixed to the main body 321 and / or the battery cell 10, reducing the risk of the buffer 70 moving relative to the main body 321 and / or the battery cell 10, so as to absorb the stress on the main body 321 through the buffer 70, thereby enabling the buffer 70 to better absorb the stress on the second side wall panel 32.

[0188] Please see Figure 6 and Figure 9 As shown, according to some embodiments of this application, along the first direction X, the distance between the buffer 70 and the top plate 31 is less than the distance between the buffer 70 and the bearing surface 211.

[0189] In the first direction X, the buffer 70 is positioned closer to the top plate 31 than the bearing surface 211. When the stress generated by the first box body 20 is transmitted to the top plate 31 of the second box body 30, the stress is first transmitted to the first flange edge 322 of the second side wall panel 32 near the bearing surface 211, then transmitted to the transition part 323 via the body part 321, and finally transmitted to the top plate 31.

[0190] In the above scheme, the distance between the buffer 70 and the top plate 31 is less than the distance between the buffer 70 and the bearing surface 211. When the stress on the second side wall plate 32 is transmitted to the top plate 31 from the end closest to the bearing surface 211, the second side wall plate 32 itself can first absorb a certain amount of stress and deform. Then, the buffer 70 absorbs a portion of the stress, which can weaken the stress transmitted to the junction of the second side wall plate 32 and the top plate 31 (transition part 323). By strengthening the structure at the junction of the second side wall plate 32 and the top plate 31 to absorb part of the stress, the stress transmitted to the top plate 31 is greatly reduced, thereby reducing the stress impact on the top plate 31 and further alleviating the phenomenon of deformation or bulging of the top plate 31 during use.

[0191] Please see Figure 6 , Figure 7 and Figure 9As shown, according to some embodiments of this application, the distance between the second sidewall 32 and the battery cell 10 gradually decreases along the direction from the support plate 21 to the top plate 31.

[0192] On the same projection plane perpendicular to the second direction Z, along the direction from the support plate 21 to the top plate 31, the distance between the orthographic projection of the second side wall panel 32 and the orthographic projection of the battery cell 10 gradually decreases. The second side wall panel 32 is inclined relative to the first direction X, which facilitates the assembly of the second box body 30 and the battery cell 10. For example, after the battery cell 10 is placed on the support plate 21, when the second box body 30 is fastened to the first box body 20, the inclined arrangement of the second side wall panel 32 facilitates the entry of the battery cell 10 between the two second side wall panels 32, reducing the assembly difficulty.

[0193] Meanwhile, compared to the second side wall panel 32 being arranged along the first direction X, the second side wall panel 32 is inclined, which makes the second side wall panel 32 have a larger surface area and makes it easier for the second side wall panel 32 to release stress through deformation.

[0194] In the above scheme, the distance between the second side wall panel 32 and the battery cell 10 gradually decreases along the direction from the bearing plate 21 to the top plate 31. The second side wall panel 32 is inclined, which makes it easier for the second side wall panel 32 to release some stress through its own deformation. Combined with the buffer 70 absorbing some of the stress on the second side wall panel 32, the stress transmitted from the second side wall panel 32 to the top plate 31 is greatly reduced, thereby reducing the stress impact on the top plate 31 and further alleviating the phenomenon of deformation or bulging of the top plate 31 during use.

[0195] According to some embodiments of this application, along the third direction Y, the buffer 70 is disposed between the second side wall panel 32 and the battery cell 10. On the same projection plane perpendicular to the third direction Y, the orthographic projection of the buffer 70 does not overlap with the orthographic projection of the first side wall panel 22.

[0196] like Figure 9 As shown, the second side wall panel 32, the buffer member 70, and the battery cell 10 are arranged along the third direction Y. The buffer member 70 can deform in the third direction Y to absorb the stress on the second side wall panel 32. With the third direction Y as the projection direction, the orthographic projection of the buffer member 70 does not overlap with the orthographic projection of the first side wall panel 22. The buffer member 70 is directly connected to the second side wall panel 32 and the battery cell 10, which is conducive to the buffer member 70 absorbing the stress on the second side wall panel 32 and reducing the stress impact on the top plate 31.

[0197] According to some embodiments of this application, see Figure 4 , Figure 7 and Figure 8As shown, the second sidewall panel 32 has a first flange edge 322 connected to the first sidewall panel 22 at its end away from the top plate 31 in the first direction X. The first flange edge 322 and the first sidewall panel 22 are stacked. The battery device 100 may also include a first seal 50, which is disposed between the first sidewall panel 22 and the first flange edge 322 to seal the gap between the first sidewall panel 22 and the first flange edge 322.

[0198] The second side wall panel 32 includes a body part 321 and a first flange edge 322 that are connected to each other. One end of the body part 321 is connected to the top plate 31 in the first direction X, and the other end is connected to the first flange edge 322. The wall thickness of the first flange edge 322 is greater than the wall thickness of the body part 321.

[0199] The first flange edge 322 and the first side wall plate 22 are stacked, that is, the first flange edge 322 and the first side wall plate 22 are stacked and arranged along the thickness direction of the first flange edge 322. For example, in Figure 7 In the middle, the first flange edge 322 and the first side wall plate 22 are stacked in a third direction Y.

[0200] The first sealing element 50 is disposed between the first side wall plate 22 and the first flange edge 322 to seal the gap between the first side wall plate 22 and the first flange edge 322. The material of the first sealing element 50 can be various, such as rubber, plastic or silicone.

[0201] In this embodiment, the end of the second sidewall panel 32 away from the top plate 31 in the first direction X is formed with a first flange edge 322 that is stacked and connected to the first sidewall panel 22. By providing a first sealing member 50 between the first flange edge 322 and the first sidewall panel 22, the first sealing member 50 can seal the gap between the first flange edge 322 and the first sidewall panel 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, during use, the risk of water vapor or liquid impurities entering the assembly space 40a from the gap between the first flange edge 322 and the first sidewall panel 22 can be reduced, thereby improving the reliability and service life of the battery device 100.

[0202] In some embodiments, see Figure 7As shown, the first sidewall panel 22 and the first flange edge 322 do not contact each other. Along the stacking direction of the first sidewall panel 22 and the first flange edge 322, the first flange edge 322 abuts against the first sidewall panel 22 through the first sealing member 50. That is to say, the first sidewall panel 22 is a structure that indirectly abuts against the first flange edge 322 through the first sealing member 50. Correspondingly, the first sidewall panel 22 and the first flange edge 322 are arranged at intervals, and the first sealing member 50 is disposed between the first sidewall panel 22 and the first flange edge 322 and separates the first sidewall panel 22 and the first flange edge 322.

[0203] In this embodiment, by setting the first side wall plate 22 and the first flange edge 322 to be indirectly abutted by the first sealing member 50, the first sealing member 50 can also play a certain buffering role between the first side wall plate 22 and the first 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 first sealing member 50 during the process of being transmitted through the first side wall plate 22 to the first 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.

[0204] In some embodiments, combined with Figure 2 and Figure 7 As shown, the battery device 100 may also include a first locking member 60, which passes through the first sealing member 50 and locks the first flange edge 322 and the first side wall plate 22.

[0205] The first locking element 60 serves to connect the first flange edge 322 and the first side wall plate 22. The structure of the first locking element 60 can be various, such as a bolt or rivet. For example, in... Figure 7 In the first locking component 60, the first locking component 60 is a bolt. The first locking component 60 is inserted into the first flange edge 322 along the stacking direction of the first side wall plate 22 and the first flange edge 322 and screwed onto the first side wall plate 22.

[0206] Optionally, the first sidewall panel 22 has a mating portion 221 that is threadedly engaged with the first locking member 60. The mating portion 221 is threadedly engaged with the first locking member 60 to achieve the first locking member 60 being 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 first flange edge 322 are also connected to each other by the first sealing member 50. Of course, in other embodiments, the mating part 221 can also be the area on the first side wall plate 22 with threaded holes.

[0207] In this embodiment, the battery device 100 is further provided with a first locking member 60 that passes through the first sealing member 50 and locks the first flange edge 322 and the first side wall plate 22. The first locking member 60 enables the first flange edge 322 and the first side wall plate 22 to be connected to each other, and enables the first flange edge 322 and the first side wall plate 22 to be tightly abutted against the first sealing member 50. This improves the sealing effect of the first sealing member 50 on the gap between the first flange edge 322 and the first side wall plate 22, and also facilitates the first sealing member 50 to absorb the stress transmitted from the first side wall plate 22 to the first flange edge 322 of the second side wall plate 32.

[0208] Of course, in other embodiments, the battery device 100 can also have other structures, for example, referring to Figure 11 and Figure 12 As shown, Figure 11 Cross-sectional views of the battery device provided in some embodiments of this application in other embodiments. Figure 12 for Figure 11 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 first flange edge 322, a contact portion 3221 protrudes from the surface of the first 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 first flange edge 322, the orthographic projection of the contact portion 3221 and the orthographic projection of the first sealing member 50 do not overlap.

[0209] The abutting part 3221 is a protruding structure on the surface of the first flange edge 322 facing the first side wall plate 22, so that the first flange edge 322 is in direct contact with the first side wall plate 22 through the abutting part 3221.

[0210] In the projection plane perpendicular to the stacking direction of the first sidewall panel 22 and the first flange edge 322, the orthographic projection of the abutment portion 3221 and the orthographic projection of the first sealing member 50 do not overlap. That is, the first sealing member 50 does not extend between the abutment portion 3221 and the first sidewall panel 22. For example, in Figure 12 In the middle, the first side wall plate 22 and the first flange edge 322 are stacked in the third direction Y. Correspondingly, the first sealing member 50 is located on one side of the abutment portion 3221 in the first direction X.

[0211] In this embodiment, an abutment portion 3221 is provided on the surface of the first flange edge 322 facing the first side wall plate 22, which directly abuts 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 first flange edge 322 does not overlap with the projection of the first sealing member 50 in the stacking direction of the first side wall plate 22 and the first 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 first sealing member 50. The battery device 100 with this structure can reduce the damage or destruction caused to the first sealing member 50 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 first sealing member 50.

[0212] In the embodiment where the abutment portion 3221 of the first flange edge 322 directly abuts against the first side wall plate 22, see [reference needed]. Figure 12 As shown, the battery device 100 may also include a first locking member 60, which locks the abutment portion 3221 and the first side wall plate 22.

[0213] The first locking member 60 serves to connect the abutment portion 3221 and the first side wall plate 22. The structure of the first locking member 60 can be varied, such as a bolt or rivet. For example, in… Figure 12 In the first locking member 60, the first locking member 60 is a bolt. The first locking member 60 passes through the first flange edge 322 and through the abutment part 3221 along the stacking direction of the first side wall plate 22 and the first flange edge 322, and the first locking member 60 is screwed onto the first side wall plate 22.

[0214] Optionally, the first sidewall panel 22 has a mating portion 221 that is threadedly engaged with the first locking member 60. The mating portion 221 is threadedly engaged with the first locking member 60 to achieve the first locking member 60 being screwed onto the first sidewall panel 22. For example, in Figure 12 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 first 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.

[0215] In this embodiment, locking the abutment portion 3221 and the first side wall plate 22 with the first locking member 60 enables the first flange edge 322 and the first side wall plate 22 to be connected to each other, and enables the abutment portion 3221 of the first flange edge 322 to abut tightly against the first side wall plate 22, thereby reducing the damage to the first seal 50 caused by the slippage or misalignment of the abutment portion 3221 and the first side wall plate 22.

[0216] In the embodiment where the abutting portion 3221 of the first flange edge 322 directly abuts against the first sidewall plate 22, please continue to refer to... Figure 12 As shown, in the projection plane perpendicular to the stacking direction of the first side wall panel 22 and the first flange edge 322, the orthographic projection of the first sealing element 50 and the orthographic projection of the bearing plate 21 can also be non-overlapping. That is, in the stacking direction of the first side wall panel 22 and the first flange edge 322, the bearing plate 21 is not obstructed by the first sealing element 50.

[0217] In this embodiment, by setting the orthographic projection of the first sealing element 50 in the projection plane perpendicular to the stacking direction of the first side wall plate 22 and the first 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 first flange edge 322, the first sealing element 50 and the support plate 21 do not have an overlapping relationship in the stacking direction of the first side wall plate 22 and the first 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 first flange edge 322 will be directly applied to the first sealing element 50 through the first side wall plate 22. This reduces the risk of damage or failure of the first sealing element 50 during use and helps to improve the service life and sealing reliability of the first sealing element 50.

[0218] In the embodiment where the abutting portion 3221 of the first flange edge 322 directly abuts against the first sidewall plate 22, please continue to refer to... Figure 12 As shown, along the stacking direction of the first side wall plate 22 and the first flange edge 322, a limiting part 222 is protruded on the surface of the first side wall plate 22 facing the first flange edge 322 or the surface of the first flange edge 322 facing the first side wall plate 22. The limiting part 222 and the abutting part 3221 are spaced apart, and the first sealing member 50 is located between the limiting part 222 and the abutting part 3221.

[0219] 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 first flange edge 322. For example, in Figure 12 In the middle, a limiting part 222 is protruding on the surface of the first side wall plate 22 facing the first flange edge 322.

[0220] The limiting portion 222 and the abutting portion 3221 are spaced apart, and the first sealing member 50 is located between the limiting portion 222 and the abutting portion 3221. That is, in a direction perpendicular to the stacking direction of the first side wall plate 22 and the first flange edge 322, the first sealing member 50 is a structure disposed between the limiting portion 222 and the abutting portion 3221. For example, in Figure 12 In the middle, the first side wall plate 22 and the first 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 first sealing member 50 is located between the abutment part 3221 and the limiting part 222 in the first direction X.

[0221] In this embodiment, a limiting part 222 is provided on the surface of the first side wall plate 22 facing the first flange edge 322 or on the surface of the first flange edge 322 facing the first side wall plate 22, and the first sealing member 50 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 first sealing member 50, thereby reducing the phenomenon of the first sealing member 50 detaching or falling off from the first 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 first sealing member 50.

[0222] According to some embodiments of this application, please refer to Figure 4 As shown, the top plate 31 is provided with a reinforcing part 311, 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 reinforcing part 311 is provided in a portion, making the area of ​​the top plate 31 with the reinforcing part 311 an area with enhanced bending strength, thereby increasing the overall bending strength of the top plate 31. It should be noted that the reinforcing part 311 and the top plate 31 can be an integrally formed structure, that is, the reinforcing part 311 is part of the top plate 31. Alternatively, the reinforcing part 311 and the top plate 31 can be separate structures, that is, the reinforcing part 311 is a component connected to the top plate 31.

[0223] By providing a reinforcing part 311 on the top plate 31 of the second housing body 30, and the reinforcing part 311 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.

[0224] According to some embodiments of this application, see Figure 4 and Figure 8 As shown, along the first direction X, the reinforcing part 311 protrudes from the surface of one side of the top plate 31, that is, the reinforcing part 311 is a structure connected to the surface of one side of the top plate 31.

[0225] In this embodiment, by protruding a reinforcing part 311 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 311 is a region with enhanced bending strength, which is simple in structure and easy to implement.

[0226] In some embodiments, refer to Figure 13 , Figure 13 This is 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. Along the first direction X, a groove 312 is formed on the surface of the top plate 31 on the side opposite to the reinforcing part 311, corresponding to the position of the reinforcing part 311. That is, the top plate 31 has a structure in which the reinforcing part 311 protrudes on one side in the first direction X, and a groove 312 is formed on the other side.

[0227] In this embodiment, by providing a groove 312 on the surface of the top plate 31 away from the reinforcing part 311 and at the position corresponding to the reinforcing part 311, the top plate 31 has a structure in which the reinforcing part 311 is protruding on one side and the groove 312 is recessed on the other side in the area where the reinforcing part 311 is provided. The top plate 31 with this structure can further increase the bending strength of the area where the reinforcing part 311 and the groove 312 are provided on the top plate 31, so as to further alleviate the deformation or bulging of the top plate 31 of the second box body 30 under stress during use. On the other hand, it can optimize the weight of the area where the reinforcing part 311 is protruding on the top plate 31, so as to reduce the overall weight of the second box body 30, thereby helping to improve the mass energy density of the battery device 100.

[0228] In some embodiments, see Figure 8 and Figure 13 As shown, along the first direction X, the reinforcing part 311 protrudes from the surface of the top plate 31 on the side away from the support plate 21. In other words, the reinforcing part 311 is provided on the outer surface of the top plate 31 away from the battery cell 10.

[0229] In this embodiment, by constructing a structure in which the reinforcing part 311 protrudes from the surface of the top plate 31 on the side away from the support plate 21, the reinforcing part 311 is located on the outside of the top plate 31 away from the assembly space 40a. This ensures that the reinforcing part 311 does not occupy the internal space of the battery device 100 used to accommodate the battery cell 10, which is beneficial to improving the internal space utilization of the battery device 100. On the other hand, it can reduce the interference between the reinforcing part 311 and components such as the battery cell 10 accommodated in the assembly space 40a, and can also reduce the collision phenomenon between components such as the battery cell 10 and the reinforcing part 311.

[0230] Of course, in some embodiments, the battery device 100 may also have other structures; please refer to [reference needed]. Figure 14 , Figure 14This is a cross-sectional view of the second housing body of the battery device provided in some embodiments of this application, perpendicular to the second direction. Along the first direction X, a reinforcing part 311 protrudes from the surface of the top plate 31 facing the support plate 21, that is, the reinforcing part 311 is provided on the inner surface of the top plate 31 facing the battery cell 10.

[0231] In this embodiment, by constructing the reinforcing part 311 protruding from the surface of the top plate 31 facing the bearing plate 21, the reinforcing part 311 is located on the inner side of the top plate 31 facing the assembly space 40a. This reduces the wear or impact of the reinforcing part 311 on the external environment during use or assembly, and helps to reduce the decrease in the bending strength of the top plate 31 of the second box body 30 after the reinforcing part 311 is damaged.

[0232] It should be noted that in embodiments where the reinforcing part 311 protrudes from one side of the top plate 31, the structure of the second box body 30 can be varied. See some embodiments for details. Figure 8 , Figure 13 as well as Figure 14 As shown, the reinforcing part 311 is integrally formed with the top plate 31. That is to say, the reinforcing part 311 is part of the top plate 31. Correspondingly, if the second box body 30 is made of metal, the reinforcing part 311 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 311 and the top plate 31 can be manufactured by integral forming processes such as injection molding.

[0233] In this embodiment, by setting the reinforcing part 311 and the top plate 31 as an integrally formed structure, the connection stability and reliability between the reinforcing part 311 and the top plate 31 can be effectively improved, which helps to reduce the risk of the reinforcing part 311 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 311.

[0234] Of course, in the embodiment where the reinforcing part 311 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 311 and the top plate 31 are separately provided and connected. That is, the reinforcing part 311 and the top plate 31 are two independent components, and the reinforcing part 311 is a structure connected to the surface of one side of the top plate 31 in the first direction X. Correspondingly, the reinforcing part 311 can be connected to the top plate 31 by means of adhesive bonding, welding connection or snap-fit ​​connection.

[0235] In this embodiment, by setting the reinforcing part 311 and the top plate 31 as separate structures, the difficulty of protruding the reinforcing part 311 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 311 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.

[0236] It should be noted that the structure of the battery device 100 is not limited to this. In some embodiments, the battery device 100 can also have other structures. For example, please refer to... Figure 15 and Figure 16 As shown, Figure 15 A cross-sectional view of the second housing body of a battery device provided in other embodiments of this application, perpendicular to the second direction. Figure 16 for Figure 15 The enlarged view of part D of the second box body shown. The reinforcing part 311 and the top plate 31 are separately provided. The reinforcing part 311 is embedded in the top plate 31, and the rigidity of the reinforcing part 311 is greater than that of the top plate 31.

[0237] The reinforcing part 311 and the top plate 31 are separately provided. The reinforcing part 311 is embedded in the top plate 31. That is to say, the reinforcing part 311 and the top plate 31 are two independent components, and the top plate 31 is a structure that covers at least part of the outer side of the reinforcing part 311.

[0238] For example, in Figure 16 In the middle, the reinforcing part 311 is a structure that is integrally embedded in the top plate 31, and correspondingly, the top plate 31 is a structure that covers the outside of the reinforcing part 311.

[0239] The stiffness of the reinforcing part 311 is greater than that of the top plate 31. In other words, the reinforcing part 311 has a greater ability to resist deformation when subjected to force than the top plate 31 has a greater ability to resist deformation when subjected to force, so that the bending strength of the area of ​​the top plate 31 where the reinforcing part 311 is provided can be strengthened by the reinforcing part 311.

[0240] For example, in this embodiment of the application, the stiffness of the material of the reinforcing part 311 is greater than the stiffness of the material of the top plate 31. For example, the material of the reinforcing part 311 can be a metal material such as steel or aluminum alloy, and correspondingly, the material of the top plate 31 can be a polymer composite material such as glass fiber reinforced plastic or polyvinylidene fluoride.

[0241] In this embodiment, by embedding a stiffer reinforcing part 311 inside the top plate 31, the stiffening part 311 can enhance the stiffness of the top plate 31 in this area, thereby enhancing the bending strength and deformation resistance of the top plate 31. The structure is simple, and the stiffening part 311 with different stiffness can be replaced according to different usage requirements.

[0242] In some embodiments, please continue to see Figure 15 and Figure 16 As shown, the top plate 31 may include a body layer 313 and a connecting layer 314. The body layer 313 and the connecting layer 314 are stacked and connected along the first direction X. The body layer 313 is connected to the second side wall plate 32. The reinforcing part 311 is disposed between the body layer 313 and the connecting layer 314.

[0243] The top plate 31 is a double-layer structure in which the main body layer 313 and the connecting layer 314 are stacked and connected in the first direction X. Correspondingly, the reinforcing part 311 is sandwiched between the main body layer 313 and the connecting layer 314 so that the reinforcing part 311 is embedded in the top plate 31.

[0244] Optionally, the connection structure between the body layer 313 and the connecting layer 314 can be various, such as adhesive bonding or thermal fusion bonding.

[0245] For example, in this embodiment of the application, the body layer 313 of the top plate 31 and the second side wall plate 32 are integrally formed.

[0246] In this embodiment, the top plate 31 is configured as a double-layer structure comprising a body layer 313 and a connecting layer 314 stacked and connected along the first direction X. The body layer 313 is the part of the top plate 31 used to connect with the second side wall panel 32, and the reinforcing part 311 is sandwiched between the body layer 313 and the connecting layer 314, so that the reinforcing part 311 is embedded in the top plate 31. The structure is simple and easy to assemble and implement.

[0247] In some embodiments, see Figure 16 As shown, the main body layer 313 and the connecting layer 314 together cover the reinforcing part 311. That is to say, the reinforcing part 311 is entirely embedded in the top plate 31, so that the top plate 31 is a structure that covers the entire outer side of the reinforcing part 311.

[0248] In this embodiment, by setting the body layer 313 and the connecting layer 314 to fit together and completely cover the reinforcing part 311, the reinforcing part 311 is embedded in the top plate 31 as a whole without any exposed areas. The second box body 30 with this structure can improve the stability and reliability of the reinforcing part 311 embedded in the top plate 31, thereby reducing the risk of the reinforcing part 311 falling out of the top plate 31 during use. On the other hand, it can reduce the wear or bumps that the reinforcing part 311 is subjected to during use, which is beneficial to reduce the phenomenon of reduced bending strength of the top plate 31 of the second box body 30 after the reinforcing part 311 is damaged.

[0249] In some embodiments, please continue to see Figure 16As shown, along the first direction X, the connecting layer 314 is connected to the side of the body layer 313 facing the support plate 21. That is, in the first direction X, the connecting layer 314 is located between the body layer 313 and the battery cell 10. Correspondingly, the reinforcing part 311 is also located on the side of the body layer 313 facing the battery cell 10.

[0250] In this embodiment, by setting the connecting layer 314 to the inner surface of the body layer 313 facing the assembly space 40a, the connecting layer 314 connected to the body layer 313 can play a certain protective role. This helps to reduce the phenomenon of damage or detachment of the connecting layer 314 due to the influence of the external environment during assembly and use, thereby reducing the risk of the reinforcing part 311 falling off from the top plate 31, and improving the service life and stability of the second box body 30.

[0251] According to some embodiments of this application, see Figure 4 and Figure 8 As shown, the top plate 31 is provided with multiple reinforcing parts 311.

[0252] It should be noted that the multiple reinforcing parts 311 provided on the top plate 31 can be arranged at intervals or can be interconnected.

[0253] In this embodiment, by providing multiple reinforcing parts 311 on the top plate 31 of the second box body 30, the bending strength of the top plate 31 is further improved, thereby further enhancing the ability of the top plate 31 of the second box body 30 to resist the stress transmitted from the first box body 20 to the second box body 30, so as to further alleviate the deformation or bulging of the top plate 31 of the second box body 30 due to stress during use.

[0254] In some embodiments, see Figure 4 As shown, the plurality of reinforcing parts 311 include a first reinforcing part 3111 and a second reinforcing part 3112, wherein the first reinforcing part 3111 and the second reinforcing part 3112 are arranged crosswise and connected.

[0255] The first reinforcing part 3111 and the second reinforcing part 3112 are intersected and connected. That is, the extending direction of the first reinforcing part 3111 and the extending direction of the second reinforcing part 3112 are arranged at a non-zero angle or a right angle, and the first reinforcing part 3111 and the second reinforcing part 3112 are connected to each other.

[0256] In this embodiment, the plurality of reinforcing parts 311 include a first reinforcing part 3111 and a second reinforcing part 3112 that are arranged crosswise and connected, such that at least two of the plurality of reinforcing parts 311 have a structure in which the extending directions intersect and are connected to each other. The reinforcing parts 311 with this structure can further increase the bending strength of the top plate 31, thereby further improving the bending strength of the top plate 31, and thus further alleviating the deformation or bulging of the top plate 31 of the second box body 30 due to stress during use.

[0257] According to some embodiments of this application, see Figure 15 and Figure 16 As shown, at least a portion of the top plate 31 bulges toward the battery cell 10 along the first direction X, forming a recessed area 316 on the side of the top plate 31 away from the battery cell 10. In other words, the top plate 31 is a structure in which at least a portion deforms and arches toward the battery cell 10 in the first direction X, forming a convex structure on the side of the top plate 31 facing the battery cell 10 and a recessed area 316 on the side of the top plate 31 away from the battery cell 10.

[0258] In this embodiment, by setting at least a portion of the top plate 31 to bulge towards the battery cell 10, the side of the top plate 31 facing away from the battery cell 10 in the first direction X is recessed towards the battery cell 10 and forms a pre-deformed structure. 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.

[0259] According to some embodiments of this application, the first sidewall panel 22 and the second sidewall panel 32 do not contact each other, and a first sealing member 50 is sandwiched between the first sidewall panel 22 and the second sidewall panel 32. The battery device 100 also includes a first locking member 60, which passes through the first sealing member 50 and locks the first sidewall panel 22 and the second sidewall panel 32.

[0260] In the above scheme, the first side wall panel 22 and the second side wall panel 32 do not contact each other, and a first sealing member 50 is sandwiched between the first side wall panel 22 and the second side wall panel 32, so that the first side wall panel 22 and the second side wall panel 32 are indirectly abutted by the first sealing member 50. The first locking member 60 passes through the first sealing member 50 and connects the first side wall panel 22 and the second side wall panel 32, so that the first side wall panel 22 and the second side wall panel 32 are locked by the first locking member 60 and abutted against the first sealing member 50. Thus, while achieving mutual assembly and connection of the first side wall panel 22 and the second side wall panel 32, the first sealing member 50 can also be used to lock the first side wall panel 22 and the second side wall panel 32 against the first sealing member 50. 2. The first sealing element 50 plays a certain role in buffering and separating the first side wall panel 32, so that the first sealing element 50 can absorb and release the stress generated by the deformation of the first box body 20 during use, thereby reducing the stress transmitted from the first side wall panel 22 of the first box body 20 to the second side wall panel 32 of the second box body 30. This can reduce the stress on the top plate 31 of the second box body 30, thereby alleviating the deformation or bulging of the top plate 31 of the second box body 30 during use. This is beneficial to extending the service life of the battery device 100 and reducing the safety hazards of the battery device 100 during use, thereby improving the service life and reliability of the battery device 100.

[0261] In some embodiments, the first locking member may include a first locking portion and a first limiting portion. Along the axial direction of the first locking portion, the first locking portion passes through the second sidewall plate 32 and the first seal 50 and is locked onto the first sidewall plate 22. The first limiting portion is connected to one end of the first locking portion and abuts against the side of the second sidewall plate 32 opposite to the first seal 50. The second sidewall plate 32 is provided with a first through hole through which the first locking portion passes. The first locking portion has a first portion that passes through the first through hole, and the first limiting portion is connected to the first portion. The diameter of the first portion is smaller than the diameter of the first through hole.

[0262] In the embodiment where the first through hole is a structure that penetrates the second side wall plate 32 along the axial direction of the first locking part, and the first side wall plate 22 and the second side wall plate 32 are stacked along the third direction Y, then the axial direction of the first locking part is parallel to the third direction Y, and correspondingly, the first through hole penetrates the second side wall plate 32 along the third direction Y.

[0263] The first part is the portion of the first locking part that passes through the first through hole, and the first part also passes through the first sealing member 50.

[0264] The diameter of the first part is smaller than the diameter of the first through hole, that is, the first part of the first locking part located in the first through hole and the hole wall surface of the first through hole have a clearance fit structure.

[0265] In the above solution, by setting the outer diameter of the first part of the first locking part located in the first through hole of the second side wall plate 32 to be smaller than the diameter of the first through hole, the first part of the first locking part and the second side wall plate 32 are in a clearance fit structure, so that the second side wall plate 32 has the ability to float relative to the first locking member 60 during use. Since the first locking member 60 is a structure locked to the first side wall plate 22, the second side wall plate 32 has the ability to float relative to the first side wall plate 22 during use, thereby alleviating the pulling or twisting caused by the first side wall plate 22 and the first locking member 60 on the second side wall plate 32, which is conducive to further reducing the stress impact on the second box body 30 during use.

[0266] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] In some embodiments, see Figure 4 , Figure 5 and Figure 7 As shown, the second sidewall panel 32 has a first 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 first flange edge 322 is parallel to the third direction Y, and the first flange edge 322 and the first sidewall panel 22 are stacked along the third direction Y.

[0271] In an embodiment where the wall thickness of the first 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 first flange edge 322 in the third direction Y is greater than the thickness dimension of the body portion 321 in the third direction Y.

[0272] In this embodiment, by setting the first 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 first flange edge 322 and the first side wall plate 22 is consistent with the thickness direction of the first 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.

[0273] 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 first 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.

[0274] In the embodiment where the first flange edge 322 of the second side wall plate 32 is screwed onto the first side wall plate 22 by the first locking member 60, the assembly difficulty of screwing the first locking member 60 and the first side wall plate 22 together can be reduced by setting the first side wall plate 22 to be located on the side of the first flange edge 322 facing the assembly space 40a in the third direction Y.

[0275] In this embodiment, by setting the first side wall panel 22 to be located on the side of the first 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.

[0276] According to some embodiments of this application, in conjunction with Figure 3 , Figure 4 and Figure 5 As shown, the second box body 30 has second flange edges 33 at both ends in the second direction Z, and the second flange edges 33 connect 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 second flange edges 33.

[0277] The second box body 30 is provided with a second flange edge 33 at both ends in the second direction Z. The second 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 second 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 second 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 second 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 second flange edges 33, so that one second 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.

[0278] Optionally, combined Figure 2 , Figure 3 and Figure 4As shown, the battery device 100 also includes a second locking member 80, which locks the second flange edge 33 and the third side wall plate 23 to connect the second flange edge 33 and the third side wall plate 23. Exemplarily, the second locking member 80 is a bolt, which passes through the second flange edge 33 and is screwed onto the third side wall plate 23 to lock the second flange edge 33 and the third side wall plate 23. Of course, in other embodiments, the second locking member 80 that locks the second flange edge 33 and the third side wall plate 23 can also be a rivet or the like.

[0279] In this embodiment, by providing a second 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 second 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 second flange edge 33, thereby reducing the assembly difficulty between the third side wall plate 23 and the second box body 30.

[0280] According to some embodiments of this application, see Figure 4 As shown, the second 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 second 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.

[0281] The first segment 331 is the area where the second flange edge 33 is connected to the top plate 31, the second segment 332 is the area where the second flange edge 33 is connected to the second side wall plate 32, and the arc segment 333 is the area in the second 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.

[0282] In this embodiment, an arc segment 333 is connected between the first segment 331 connecting the second flange edge 33 to the top plate 31 and the second segment 332 connecting the second flange edge 33 to the second side wall plate 32. This creates an arc transition structure between the area where the second flange edge 33 connects to the top plate 31 and the area where the second flange edge 33 connects to the second side wall plate 32. This reduces the occurrence of sharp corners at the connection point of the second flange edge 33 with the top plate 31 and the second side wall plate 32. Consequently, it facilitates the assembly and connection of the second 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 second 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 second flange edge 33 during use.

[0283] 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 315 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 315 are connected by the inner surface of the connecting portion 34. Along the first direction X, the first inner surface 315 is further away from the support plate 21 than the second inner surface 3311.

[0284] 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 second 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.

[0285] Along the first direction X, the first inner surface 315 is further away from the support plate 21 than the second inner surface 3311. That is to say, the overall structure formed by the top plate 31, the connecting part 34, and the first section 331 of the second 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.

[0286] In this embodiment, the first segment 331 of the second flange edge 33 and the top plate 31 are connected to each other through the connecting part 34, and the first inner surface 315 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 second 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 second flange edge 33, and also increases the volume of the assembly space 40a 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.

[0287] According to some embodiments of this application, see Figure 4 As shown, the second sidewall panel 32 has a first 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 first flange edge 322 of each second sidewall panel 32 is connected to two second flange edges 33 at both ends in the second direction Z.

[0288] In an embodiment where the first flange edge 322 is connected to the second section 332 of the second 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 first flange edge 322, then it is a structure in which one first flange edge 322, one second flange edge 33, another first flange edge 322 and another second flange edge 33 are connected end to end in sequence.

[0289] In this embodiment, by connecting the two ends of the first flange edge 322 of the second side wall plate 32 in the second direction Z to the two second flange edges 33 located at the two ends of the top plate 31 in the second direction Z, the first flange edge 322 and the second 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.

[0290] According to some embodiments of this application, see Figure 3 As shown, the battery device 100 may also include a second seal (not shown in the figure), which is disposed between the second flange edge 33 and the third side wall plate 23 to seal the gap between the second flange edge 33 and the third side wall plate 23.

[0291] The third side wall plate 23 is a structure located on the inner side of the second flange edge 33 facing the bearing plate 21. Correspondingly, the second sealing element is a strip structure with the same extension direction as the second flange edge 33. The third side wall plate 23 is provided with the second sealing element at one end away from the bearing plate 21 in the first direction X and at both ends in the third direction Y.

[0292] For example, the material of the second seal can be various, such as plastic, rubber or silicone.

[0293] In this embodiment, by providing a second sealing element between the second flange edge 33 and the third side wall plate 23, the second sealing element can seal the gap between the second 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 second 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.

[0294] 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.

[0295] 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.

[0296] 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 bearing 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.

[0297] 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.

[0298] For example, the third side wall panel 23 and the supporting plate 21 are connected by bolts.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] In some embodiments, please continue to see Figure 3 and Figure 5 As 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.

[0305] 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.

[0306] 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.

[0307] 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 17 , Figure 18 , Figure 19 and Figure 20 As shown, Figure 17 This is a schematic diagram of the structure of a battery device provided in some further embodiments of this application. Figure 18 Exploded views of the structure of the battery device provided in some further embodiments of this application. Figure 19 This is a schematic diagram of the structure of the second housing body of the battery device provided in some further embodiments of this application. Figure 20 This is a schematic diagram of the structure of the first housing body of the battery device provided in some further 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.

[0308] 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.

[0309] 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.

[0310] According to some embodiments of this application, refer to Figure 18 , Figure 19 and Figure 20 Please refer to further details. Figure 21 and Figure 22 , Figure 21 A cross-sectional view of the second housing body of the battery device provided in some further embodiments of this application, perpendicular to the second direction. Figure 22 The first housing body 20 of the battery device 100 provided in some further embodiments of this application is a cross-sectional view perpendicular to the second direction Z. The second side wall panel 32 has a first flange edge 322 connected to the first side wall panel 22 at the end away from the top plate 31 in the first direction X. The thickness direction of the first flange edge 322 is parallel to the first direction X, and the first flange edge 322 and the first side wall panel 22 are stacked along the first direction X.

[0311] The second side wall panel 32 includes a body part 321 and a first flange edge 322 that are connected to each other. The two ends of the body part 321 in the first direction X are respectively connected to the top plate 31 and the first flange edge 322. The thickness direction of the first flange edge 322 is parallel to the first direction X. The body part 321 and the first flange edge 322 form an "L" shape. Correspondingly, the thickness direction of the first flange edge 322 and the thickness direction of the body part 321 can be set at an acute angle, a right angle or an obtuse angle.

[0312] In this embodiment, by setting the first 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 first flange edge 322 and the first side wall panel 22 is consistent with the thickness direction of the first 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 first 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.

[0313] In some embodiments, see Figure 19As shown, the first flange edges 322 of multiple second sidewall plates 32 are connected end to end in sequence.

[0314] In this embodiment, by setting the first flange edges 322 of the multiple second side wall panels 32 to be connected end to end, the first 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.

[0315] According to some embodiments of this application, refer to Figure 20 and Figure 22 Please refer to further details. Figure 23 As shown, Figure 23 for Figure 22 The diagram shows a partial enlarged view of point E 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 first flange edge 322 are stacked and connected along the first direction X.

[0316] 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 first flange edge 322, so that the flange 224 and the first flange edge 322 are stacked and connected along the first direction X.

[0317] For example, the body 223 and the flange 224 of the first side panel 22 are integrally formed.

[0318] 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 first 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.

[0319] In some embodiments, see Figure 22 and Figure 23 As shown, the first side wall panel 22 and the bearing plate 21 are integrally formed.

[0320] 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.

[0321] 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.

[0322] According to some embodiments of this application, see Figure 7 , Figure 12 as well as Figure 23 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] For example, the material of the heat conductor 90 can be various, such as silicone, silicone grease or silicone rubber.

[0327] 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.

[0328] 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.

[0329] The electrical device can be any of the aforementioned devices or systems that utilize battery device 100.

[0330] 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. A buffer is provided between the second sidewall panel and the battery cell.

2. The battery device according to claim 1, characterized in that, The buffer is configured to be supported between the second sidewall panel and the battery cell, and the second sidewall panel protrudes in a direction away from the battery cell.

3. The battery device according to claim 1, characterized in that, The material of the top plate is the same as that of the second side wall plate, and the elastic modulus of the buffer is less than that of the top plate.

4. The battery device according to claim 3, characterized in that, The top plate and the second side wall plate are integrally formed.

5. The battery device according to claim 1, characterized in that, The buffer component is made of foam material.

6. The battery device according to claim 1, characterized in that, The number of battery cells is multiple, and the multiple battery cells are stacked along a second direction, which is perpendicular to the first direction. The buffer extends along the second direction.

7. The battery device according to claim 1, characterized in that, The number of battery cells is multiple, and the multiple battery cells are stacked along a second direction, which is perpendicular to the first direction. The number of buffers is multiple, and the multiple buffers are spaced apart along the second direction.

8. The battery device according to claim 1, characterized in that, The second sidewall panel includes a body portion, a transition portion, and a first flange edge. The transition portion connects the top plate and the body portion. The first flange edge is located at the end of the body portion away from the transition portion and is connected to the first sidewall panel.

9. The battery device according to claim 8, characterized in that, The buffer is disposed between the main body and the battery cell.

10. The battery device according to claim 9, characterized in that, The buffer is bonded to the main body and / or the battery cell.

11. The battery device according to claim 1, characterized in that, Along the first direction, the distance between the buffer and the top plate is less than the distance between the buffer and the bearing surface.

12. The battery device according to claim 1, characterized in that, Along the direction from the support plate to the top plate, the distance between the second side wall plate and the battery cell gradually decreases.

13. The battery device according to claim 1, characterized in that, Along the third direction, the buffer is disposed between the second side wall plate and the battery cell. On the same projection plane perpendicular to the third direction, the orthographic projection of the buffer does not overlap with the orthographic projection of the first side wall plate.

14. The battery device according to any one of claims 1-13, characterized in that, The second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction, and the first flange edge is stacked with the first sidewall panel. The battery device further includes a first sealing element, which is disposed between the first side wall plate and the first flange edge to seal the gap between the first side wall plate and the first flange edge.

15. The battery device according to claim 14, characterized in that, The first sidewall panel and the first flange edge do not contact each other. Along the stacking direction of the first sidewall panel and the first flange edge, the first flange edge abuts against the first sidewall panel through the first sealing element.

16. The battery device according to claim 15, characterized in that, The battery device further includes a first locking member, which passes through the first seal and locks the first flange edge and the first side wall plate.

17. The battery device according to claim 14, characterized in that, Along the stacking direction of the first sidewall panel and the first flange edge, the surface of the first flange edge facing the first sidewall panel is provided with an abutment portion, which directly abuts against the first sidewall panel; Specifically, in the projection plane perpendicular to the stacking direction of the first sidewall and the first flange edge, the orthographic projection of the abutment portion and the orthographic projection of the first seal do not overlap.

18. The battery device according to claim 17, characterized in that, The battery device further includes a first locking member, which locks the abutment portion and the first side wall plate.

19. The battery device according to claim 17, characterized in that, In the projection plane perpendicular to the stacking direction of the first sidewall and the first flange edge, the orthographic projection of the first seal and the orthographic projection of the bearing plate do not overlap.

20. The battery device according to claim 17, characterized in that, Along the stacking direction of the first sidewall panel and the first flange edge, a limiting part is provided on the surface of the first sidewall panel facing the first flange edge or on the surface of the first flange edge facing the first sidewall panel, and the limiting part and the abutting part are spaced apart; The first sealing element is located between the limiting part and the abutting part.

21. 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.

22. The battery device according to claim 21, characterized in that, Along the first direction, the reinforcing part protrudes from the surface of one side of the top plate.

23. The battery device according to claim 1, characterized in that, Along the first direction, at least a portion of the top plate bulges toward the battery cell to form a recessed area on the side of the top plate opposite to the battery cell.

24. The battery device according to claim 1, characterized in that, The first side wall panel and the second side wall panel do not contact each other, and a first sealing member is sandwiched between the first side wall panel and the second side wall panel. The battery device also includes a first locking member, which passes through the first sealing member and locks the first side wall panel and the second side wall panel.

25. The battery device according to any one of claims 1-24, 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 the 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.

26. The battery device according to claim 25, characterized in that, The second sidewall panel has a first 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 first flange edge is parallel to the third direction, and the first flange edge and the first sidewall panel are stacked along the third direction.

27. The battery device according to claim 26, characterized in that, Along the third direction, the first sidewall plate is located on the side of the first flange facing the assembly space.

28. The battery device according to claim 25, characterized in that, The second box body is provided with a second flange at both ends in the second direction, and the second flange connects the top plate and the two second side wall plates; The third sidewall plate is connected to the second 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.

29. The battery device according to claim 28, characterized in that, The second 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 the two second sidewall plates, and the two second segments are respectively connected to the two ends of the third sidewall plate in the third direction. The second flange edge further includes an arc segment, and each second segment is connected to the first segment through one of the arc segments.

30. The battery device according to claim 29, 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.

31. The battery device according to claim 28, characterized in that, The second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction, and the first flange edge of each second sidewall panel is connected to two second flange edges at both ends in the second direction.

32. The battery device according to claim 28, characterized in that, The battery device also includes: A second sealing element is disposed between the second flange edge and the third sidewall plate to seal the gap between the second flange edge and the third sidewall plate.

33. The battery device according to claim 25, characterized in that, The first side wall panel and the supporting plate are separately arranged but connected.

34. The battery device according to claim 25, characterized in that, The third sidewall panel is detachably connected to the support plate.

35. The battery device according to claim 25, 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.

36. The battery device according to claim 35, 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.

37. The battery device according to any one of claims 1-24, 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.

38. The battery device according to claim 37, characterized in that, The second sidewall panel has a first 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 first flange edge is parallel to the first direction, and the first flange edge and the first sidewall panel are stacked along the first direction.

39. The battery device according to claim 38, characterized in that, The first flange edges of multiple second sidewall panels are connected end to end in sequence.

40. The battery device according to claim 38, 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 first flange edge along the first direction.

41. The battery device according to claim 37, characterized in that, The first side wall panel and the bearing plate are integrally formed.

42. 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.

43. The battery device according to claim 42, 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.

44. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-43, the battery device being used to provide electrical energy.

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