Battery device and electric device

Abstract

The application provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer, 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. The bearing plate has a bearing surface for supporting the battery monomer in a first direction, and the first side wall plate is connected to the bearing plate and protrudes from the bearing surface. The second box body comprises a top plate and a second side wall plate. The top plate and the bearing plate are oppositely arranged in the first direction, and the second side wall plate is connected to the first side wall plate and 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. At least part of the top plate is raised in a direction away from the bearing plate and forms a protrusion. The cross section of the protrusion perpendicular to the extension direction of the protrusion is arc-shaped. The protrusion can release the stress received by the top plate, and is beneficial to alleviate the cracking or damage of the top plate during use.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery pack consists of a casing and individual battery cells housed within it. As a core component of new energy vehicles, the battery pack has high requirements in terms of both lifespan and reliability.

[0003] During the use of battery devices, they are usually mounted on corresponding target components. However, due to the complex operating environment of battery devices, the existing battery device casings are prone to cracking or damage during use, which is detrimental to improving the service life and reliability of the battery devices. Utility Model Content

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

[0005] In a first aspect, embodiments of this application provide 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, 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, and 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. 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 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. At least a portion of the top plate bulges away from the support plate and forms a protrusion, and the cross-section of the protrusion perpendicular to its extension direction is arc-shaped.

[0006] In the above technical solution, the battery device includes a first housing body and a second housing body. The first side wall of the first housing body and the second side wall 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, so that the support plate of the first housing body supports and bears 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 of the first housing body protruding from the support surface less than one-quarter of the maximum dimension of the second side wall, the size of the first side wall of the first housing body used for assembly and connection with the second housing body is smaller. This optimizes the dimensions of the first housing body in the first direction and reduces the binding force of the first housing body on the second housing body, thereby reducing the tension between the first housing body and the target component. This reduces the assembly difficulty between cells and the assembly difficulty of the battery pack. By setting the top plate of the second housing to bulge away from the support plate, the stress generated by the deformation of the first housing due to the torque generated by the target component during use can be released through the bulge formed by the top plate of the second housing. This effectively alleviates the cracking or damage of the top plate of the second housing during use, thereby extending the service life of the battery pack and reducing the risk of leakage or leakage during use. This improves the service life and reliability of the battery pack.

[0007] In some embodiments, the top plate has a first outer surface facing away from the support plate in the first direction, and the protrusion protrudes from the first outer surface; wherein, along the first direction, the ratio of the size of the protrusion protruding from the first outer surface to the maximum size of the second sidewall plate is greater than or equal to 0.01 and less than or equal to 0.3.

[0008] In the above technical solution, on the one hand, the size of the protrusion protruding from the first outer surface in the first direction is set to be greater than or equal to 0.01 of the maximum size of the second side wall plate in the first direction, so that the protrusion has sufficient height to release the stress transmitted from the second side wall plate to the top plate, which is conducive to improving the stress release effect of the protrusion and further alleviating the phenomenon of cracking or damage of the top plate of the second box body during use. On the other hand, the size of the protrusion protruding from the first outer surface in the first direction is set to be less than or equal to 0.3 of the maximum size of the second side wall plate in the first direction, which is conducive to reducing the space occupied by the protrusion in the first direction, thereby optimizing the overall size of the battery device in the first direction, and reducing the phenomenon of excessive difficulty in forming the protrusion.

[0009] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the top plate is rectangular, and the orthographic projection of the protrusion extends along the diagonal of the orthographic projection of the top plate.

[0010] In the above technical solution, by setting the orthographic projection of the protrusion in the projection plane perpendicular to the first direction as a structure extending along the diagonal of the top plate, the protrusion formed on the top plate is a structure that rises in the diagonal region of the top plate. This structure can better release the torque stress transmitted from the first box body to the second box body, thereby reducing the torque influence on the top plate of the second box body during use, which is beneficial to further alleviate the phenomenon of cracking or damage to the top plate of the second box body during use.

[0011] In some embodiments, the stiffness of the second box body is less than the stiffness of the first box body.

[0012] In the above technical solution, by setting the stiffness of the second box body to be less than that of the first box body, the second box body is more easily deformable than the first box body. This allows the second box body to better release stress during the transmission of stress on the second side wall, thereby reducing the stress transmitted from the first box body to the top plate of the second box body. On the other hand, it reduces the resistance of the second box body when it is affected by the stress of the first box body, thus reducing the risk of damage or cracking of the second box body during use through deformation and other means.

[0013] In some embodiments, 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 and the first sidewall panel are stacked; wherein, the battery device further includes a first seal, the first seal being 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.

[0014] In the above technical solution, the end of the second sidewall 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 sidewall panel. By providing a first sealing element between the first flange edge and the first sidewall panel, the first sealing element can seal the gap between the first flange edge and the first sidewall 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 sidewall panel during use, thereby improving the reliability and service life of the battery device.

[0015] In some embodiments, a portion of the first flange edge directly abuts against the first sidewall panel, and in a projection plane perpendicular to the stacking direction of the first sidewall panel and the first flange edge, the orthographic projection of the area where the first flange edge directly abuts against the first sidewall panel is completely misaligned with the orthographic projection of the first seal.

[0016] In the above technical solution, by setting the first flange edge and the first side wall plate as a direct contact structure, and the orthographic projection of the area where the first flange edge and the first side wall plate directly contact each other in the projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge and 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 are completely misaligned, so that the first seal is a structure that does not extend to the area where the first flange edge and the first side wall plate directly contact each other. The battery device with this structure can reduce the damage or destruction caused to the first seal by the mutual squeezing of the first flange edge and the first side wall plate, which is beneficial to improving the service life and sealing reliability of the first seal. On the other hand, it can realize that the stress generated on the first box body can be directly transferred to the second side wall plate through the first flange edge and then released through the protrusion on the top plate, which is beneficial to reduce the phenomenon of stress concentration between the first box body and the second box body.

[0017] In some embodiments, along the stacking direction of the first sidewall panel and the first flange edge, one of the surfaces of the first flange edge facing the first sidewall panel and the first sidewall panel facing the first flange edge is provided with an abutting portion, and the abutting portion directly abuts against the other; wherein, in a projection plane perpendicular to the stacking direction of the first sidewall panel and the first flange edge, the orthographic projection of the abutting portion and the orthographic projection of the first seal are completely misaligned.

[0018] In the above technical solution, by providing a protruding abutment portion on one of the first flange edge and the first side wall plate, and the abutment portion having a structure that directly abuts against the other, direct contact between the first flange edge and the first side wall plate is achieved. On the one hand, while achieving direct contact between the first flange edge and the first side wall plate, the difficulty of setting the first sealing element between the first flange edge and the first side wall plate is reduced. On the other hand, it can further reduce the squeezing phenomenon caused by the first flange edge and the first side wall plate on the first sealing element, and facilitate the first side wall plate to directly transfer the stress generated on the first box body to the second side wall plate through the abutment portion, and then release it through the protrusion on the top plate.

[0019] In some embodiments, 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 the abutting portion, and the abutting portion directly abuts against the first sidewall panel.

[0020] In the above technical solution, by providing a protruding abutment portion on the surface of the first flange facing the first side wall panel that directly abuts against the first side wall panel, and by making the abutment portion directly contact the first side wall panel and misaligned with the first sealing element, the battery device with this structure can, on the one hand, reduce the damage or destruction to the first sealing element caused by the mutual squeezing of the abutment portion and the first side wall panel, and reduce the manufacturing and molding difficulty of the abutment portion. On the other hand, it is convenient for the first side wall panel to directly transfer the stress generated on the first box body to the second side wall panel through the abutment portion and then release it through the protrusion on the top plate, which helps to reduce the phenomenon of stress concentration between the first box body and the second box body.

[0021] In some embodiments, the battery device further includes a first locking member, which passes through the abutment portion and locks the first flange edge and the first side wall plate.

[0022] In the above technical solution, by inserting the first locking member into the abutment part and locking the first flange edge and the first side wall plate, the first flange edge and the first side wall plate can be connected to each other, and the abutment part can be tightly abutted against the first side wall plate or the first flange edge. Thus, while assembling the first box body and the second box body, it is also convenient for the first side wall plate to directly transfer the stress generated on the first box body to the second side wall plate through the abutment part, and then release it through the protrusion on the top plate. This helps to further reduce the phenomenon of stress concentration between the first box body and the second box body.

[0023] In some embodiments, 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.

[0024] In the above technical 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 separating 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.

[0025] In some embodiments, in a 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 support plate are completely misaligned.

[0026] In the above technical 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 be completely misaligned 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.

[0027] In some embodiments, the top plate and the second side wall plate are integrally formed.

[0028] In the above technical solution, by setting the top plate and the second side wall plate of the second box body as an integrally formed structure, on the one hand, the connection stability and reliability between the top plate and the second side wall plate can be improved, thereby improving the overall structural strength of the second box body. On the other hand, the stress transfer effect of the second side wall plate to the top plate can be improved, so that the stress can be further released through the protrusion, thereby reducing the phenomenon of stress concentration on the second side wall plate, which is conducive to reducing the risk of damage or cracking of the second side wall plate during use.

[0029] In some embodiments, the first box body includes two first sidewall panels disposed opposite to each other along a second direction, and the second box body includes two second sidewall panels disposed opposite to each other along the second direction, each second sidewall panel being connected to one of the first sidewall panels; wherein, the first box body further includes two third sidewall panels disposed opposite to each other along a third direction, both of the two third sidewall panels being connected to the side of the support plate facing the top plate, the two third sidewall panels being located at both ends of the second box body in the third direction, and the top plate and the two second sidewall panels being connected to the third sidewall panels, the first direction, the second direction and the third direction being perpendicular to each other.

[0030] In the above technical solution, the first box body includes two first side wall panels arranged opposite each other along the second direction, and the second box body includes two second side wall panels arranged opposite each other along the second direction. Each second side wall panel is connected to a first side wall panel to realize the mutual connection between the two sides of the first box body and the second box body in the second direction. The first box body also includes two third side wall panels at both ends of the top plate arranged at intervals along the third 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 two sides of the first box body and the second box body in the third 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.

[0031] In some embodiments, 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 second direction, and the first flange edge and the first sidewall panel are stacked along the second direction.

[0032] In the above technical solution, by setting the first flange edge of the second side wall plate for interconnection with the first side wall plate as a structure that is stacked with the first side wall plate along the second 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 the second 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.

[0033] In some embodiments, along the second direction, the first sidewall plate is located on the side of the first flange facing the assembly space.

[0034] In the above technical solution, by setting the first side wall panel to be located on the side of the first flange facing the assembly space in the second direction, the two first side wall panels of the first box body are located between the two second side wall panels in the second 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 second direction. This makes it easier for the second side wall panel to cover the first side wall panel and helps to reduce the assembly difficulty between the first side wall panel and the second side wall panel.

[0035] In some embodiments, the second box body is provided with second flange edges at both ends in the third direction, and the second flange edges connect the top plate and the two second side wall plates; wherein, both ends of the third side wall plate in the second 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.

[0036] In the above technical solution, 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 second 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.

[0037] In some embodiments, 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 second 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.

[0038] In the above technical solution, 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 is a structure with an arc transition. 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, it facilitates the assembly and connection between the second flange edge and the third side wall plate, which helps to reduce the assembly difficulty between the second flange edge and the third side wall plate. On the other hand, it can alleviate the stress concentration phenomenon at the connection position of the 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.

[0039] In some embodiments, 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 the first direction, the first segment has a second inner surface facing the support plate in the first direction, the second inner surface abuts against the third sidewall panel, 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.

[0040] In the above technical solution, 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 segment 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.

[0041] In some embodiments, 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 third direction.

[0042] In the above technical solution, by connecting the two ends of the first flange edge of the second side wall plate in the third direction to the two second flange edges located at the two ends of the top plate in the third 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.

[0043] In some embodiments, the battery device further includes a second seal; the second seal 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.

[0044] In the above technical solution, 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.

[0045] In some embodiments, the first sidewall panel and the support plate are separately disposed but connected.

[0046] In the above technical solution, by setting the first side wall panel and the bearing 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 bearing plate along the second 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 bearing surface of the bearing plate in the first direction, which is beneficial to improving the applicability of the first box body.

[0047] In some embodiments, the third sidewall panel is detachably connected to the support plate.

[0048] In the above technical 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 convenient to maintain and repair the first box body in the future, which helps to reduce the later use cost of the battery device.

[0049] In some embodiments, the first box body further includes a reinforcing member; the reinforcing member is disposed on the side of the support plate facing the top plate, the reinforcing member extends along the second direction, and the two ends of the reinforcing member in the second direction are respectively connected to the two first side wall plates.

[0050] In the above technical solution, by providing a reinforcing member on the side of the bearing plate facing the top plate, and the reinforcing member extending along the second 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 second 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.

[0051] In some embodiments, the first housing body includes two reinforcing members, which are spaced apart along the third direction, and the battery cell is disposed between the two reinforcing members along the third direction.

[0052] In the above technical solution, by setting two reinforcing members on the support plate, and the two reinforcing members are arranged at intervals along the third 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 third direction of the battery cells placed on the support plate, so as to reduce the risk of the battery cells shaking or shifting along the third direction during use.

[0053] In some embodiments, the first box body includes a plurality of first side wall panels, which surround the support 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 one of the first side wall panels.

[0054] In the above technical solution, 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.

[0055] In some embodiments, 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.

[0056] In the above technical solution, 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.

[0057] In some embodiments, the first flange edges of a plurality of second sidewall panels are connected end to end in sequence.

[0058] In the above technical solution, 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.

[0059] In some embodiments, 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 and the first flange edge are stacked and connected along the first direction.

[0060] In the above technical 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.

[0061] In some embodiments, the first sidewall panel and the support plate are integrally formed.

[0062] In the above technical 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.

[0063] In some embodiments, the support plate has internal channels for containing heat exchange media, and the support plate is also configured to manage the temperature of the battery cells.

[0064] In the above technical solution, 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.

[0065] In some embodiments, the battery device further includes a heat-conducting element disposed between the bearing surface and the battery cell along the first direction.

[0066] In the above technical solution, 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.

[0067] Secondly, embodiments of this application also provide an electrical device, including the battery device described above, wherein the battery device is used to provide electrical energy. Attached Figure Description

[0068] 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.

[0069] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0070] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0071] Figure 3 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0072] 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;

[0073] 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;

[0074] Figure 6 Cross-sectional views of a battery device provided for some embodiments of this application;

[0075] Figure 7 for Figure 6 A partial enlarged view of point A of the battery device shown;

[0076] Figure 8 A cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to a third direction;

[0077] Figure 9 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0078] Figure 10 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0079] Figure 11 A schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application;

[0080] Figure 12 A schematic diagram of the structure of the first housing body of the battery device provided in some embodiments of this application;

[0081] Figure 13 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;

[0082] Figure 14 A cross-sectional view of the first housing body of a battery device provided in some embodiments of this application, perpendicular to a third direction;

[0083] Figure 15 for Figure 14 A magnified view of part B of the first box body shown.

[0084] 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 - Protrusion; 312 - First Outer Surface; 313 - First Inner Surface; 32 - Second Side Wall panel; 321-Body part; 322-First flange edge; 3221-Abutting part; 33-Second flange edge; 331-First section; 3311-Second inner surface; 332-Second section; 333-Arc segment; 34-Connecting part; 40-Assembly space; 50-Box body; 60-First sealing element; 70-First locking element; 80-Second locking element; 90-Heat-conducting element; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0086] 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 accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0087] In this application, the reference to "embodiment" means that a particular 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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0088] 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.

[0089] 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.

[0090] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0091] In this application, "multiple" means two or more (including two).

[0092] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0093] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0094] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0095] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0096] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0097] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0098] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0099] In some implementations, the electrode assembly has a stacked structure.

[0100] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0101] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0102] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0103] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0104] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0105] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0106] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0107] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0108] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0113] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0118] 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.

[0119] For a typical battery pack, it includes a housing and multiple battery cells housed within it. 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 target component. For example, in electric vehicles, a mounting structure is usually installed on the first housing body for connection to the vehicle's load-bearing beams to assemble the battery pack. However, due to dimensional or flatness differences at the mounting points between the battery pack and the target component, and because of the usage environment of the battery pack... The complex environment causes the target component 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 smaller binding force between the first and second housing bodies and lower structural strength of the first housing body, making it prone to deformation. The stress generated by this deformation is then transferred to the top plate of the second housing body, causing it to crack or be damaged. This leads to a shorter lifespan for the battery housing and increases the risk of leakage or current leakage during battery use, ultimately hindering the improvement of the battery's lifespan and reliability.

[0120] 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 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 supports 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, 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 disposed opposite 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. At least a portion of the top plate bulges away from the support plate, forming a protrusion, and the cross-section of the protrusion perpendicular to its extension direction is arc-shaped.

[0121] In this battery device structure, the battery device includes a first housing body and a second housing body. A first side wall plate of the first housing body and a second side wall plate of the second housing body are connected to each other. The first housing body is provided with a mounting structure for assembly and connection with a target component. This facilitates the support and bearing of the battery cells by the support plate of the first housing body, and makes it easy to assemble the battery device onto the target component for power supply. By making the dimension of the first side wall plate protruding from the support surface less than one-quarter of the maximum dimension of the second side wall plate, the size of the first side wall plate used for assembly and connection with the second housing body is reduced. This optimizes the dimensions of the first housing body in the first direction and reduces the binding force of the first housing body on the second housing body, thereby reducing the distance between the first housing body and the target component. The assembly difficulty between components is reduced, and the difficulty of assembling individual battery cells onto the support plate is also reduced, thereby simplifying the assembly of the battery device. Specifically, by setting the top plate of the second housing body to bulge away from the support plate, when the first housing body deforms due to the torque generated by the target component during use, the stress generated by the deformation of the first housing body is transferred to the second housing body and released through the bulge formed by the top plate of the second housing body. This effectively alleviates the phenomenon of cracking or damage to the top plate of the second housing body during use, thereby extending the service life of the battery device and reducing the risk of leakage or leakage during use, which is conducive to improving the service life and reliability of the battery device.

[0122] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be composed of the battery device disclosed in this application. This helps to alleviate the problem of cracking or damage to the battery device's casing during use, thereby improving the battery device's lifespan and reliability.

[0123] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0124] 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.

[0125] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 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. 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 supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0126] In some embodiments of this application, the battery device 100 can not only serve as the operating power or 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.

[0127] According to some embodiments of this application, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, Figure 2 This is a schematic diagram of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the second housing body 30 of the battery device 100 provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the first housing body 20 of the battery device 100 provided in some embodiments of this application. Figure 6 This is a cross-sectional view of a battery device 100 provided in some embodiments of this application. Figure 7 for Figure 6 A partial enlarged view of point A of the battery device 100 shown. Figure 8 This is a cross-sectional view of the second housing body 30 of a battery device 100 provided in some embodiments of this application, perpendicular to a third direction Z. 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 40 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 disposed 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. At least a portion of the top plate 31 bulges away from the support plate 21 to form a protrusion 311, and the cross-section of the protrusion 311 perpendicular to its extension direction is arc-shaped.

[0128] 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.

[0129] The first housing body 20 and the second housing body 30 of the battery device 100 together define an assembly space 40 for accommodating the battery cells 10, such that the first housing body 20 and the second housing body 30 together form the housing 50 of the battery device 100, and the housing 50 provides the assembly space 40 for the battery cells 10. Optionally, the housing 50 formed by the first housing body 20 and the second housing body 30 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of the box 50 formed by the first box body 20 and the second box body 30 is a cuboid. Correspondingly, the height direction of the box 50 is the first direction X, the width direction of the box 50 is the second direction Y, and the length direction of the box 50 is the third direction Z.

[0130] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 50. When there are multiple battery cells 10 disposed within the housing 50, 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 50. Alternatively, the battery device 100 can also consist 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 50.

[0131] 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.

[0132] 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.

[0133] 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 40, 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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 second 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 40.

[0140] Combination Figure 4 and Figure 8As shown, at least a portion of the top plate 31 protrudes away from the support plate 21 to form a protrusion 311, and a groove structure is formed on the side of the top plate 31 facing the support plate 21. The cross-section of the protrusion 311 perpendicular to its extension direction is arc-shaped. That is, at least a portion of the top plate 31 is a structure that protrudes along the direction from the support plate 21 to the top plate 31 in the first direction X, and the part of the top plate 31 that is protruded is the protrusion 311. The extension direction of the protrusion 311 is the length direction of the orthogonal projection of the protrusion 311 in the projection plane perpendicular to the first direction X. Correspondingly, the extension direction of the protrusion 311 is a structure perpendicular to the first direction X. Therefore, the protrusion 311 is a curved structure away from the outer surface of the battery cell 10.

[0141] For example, in the embodiments of this application, see Figure 4 As shown, the orthographic projection of the top plate 31 in the projection plane perpendicular to the first direction X is rectangular. Correspondingly, the orthographic projection of the protrusion 311 in the projection plane perpendicular to the first direction X is a strip structure extending along the diagonal of the top plate 31. Therefore, the cross-section of the protrusion 311 perpendicular to the diagonal of the top plate 31 is an arc-shaped structure.

[0142] 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.

[0143] In this embodiment, the battery device 100 includes a first housing body 20 and a second housing body 30. A first side wall panel 22 of the first housing body 20 and a second side wall panel 32 of the second housing body 30 are interconnected. The first housing body 20 is provided with a mounting structure for assembly and connection with a target component, so that the support plate 21 of the first housing body 20 supports and carries the battery cell 10, and facilitates the assembly of the battery device 100 onto the target component for power supply. By making the dimension of the first side wall panel 22 protruding from the support surface 211 less than one-quarter of the maximum dimension of the second side wall panel 32, the dimension of the first side wall panel 22 for assembly and connection with the second housing body 30 is smaller. This optimizes the dimensions of the first housing body 20 in the first direction X and reduces the binding force of the first housing body 20 on the second housing body 30, thereby reducing the tension between the first housing body 20 and the target component. The assembly difficulty between components is reduced, and the difficulty of assembling the battery cell 10 onto the support plate 21 is also reduced, thereby reducing the assembly difficulty of the battery device 100. Specifically, by setting the top plate 31 of the second box body 30 to be bulging away from the support plate 21 to form a protrusion 311, when the first box body 20 deforms due to the torque generated by the target component during use, the stress generated by the deformation of the first box body 20 is transferred to the second box body 30 and can be released through the protrusion 311 formed by the top plate 31 of the second box body 30 bulging away from the support plate 21. This can effectively alleviate the phenomenon of cracking or damage of the top plate 31 of the second box body 30 during use, thereby extending the service life of the battery device 100 and reducing the risk of leakage or leakage during use of the battery device 100, which is conducive to improving the service life and reliability of the battery device 100.

[0144] According to some embodiments of this application, in conjunction with Figure 4 , Figure 6 and Figure 8 As shown, the top plate 31 has a first outer surface 312 facing away from the support plate 21 in the first direction X, and a protrusion 311 protrudes from the first outer surface 312. Along the first direction X, the ratio of the size of the protrusion 311 protruding from the first outer surface 312 to the maximum size of the second side wall plate 32 is greater than or equal to 0.01 and less than or equal to 0.3.

[0145] Among them, the protrusion 311 protrudes from the first outer surface 312 in the first direction X by a dimension of D3, and the maximum dimension of the second side wall plate 32 in the first direction X is D2, that is, 0.01D2≤D3≤0.3D2.

[0146] For example, the size D3 of the protrusion 311 protruding from the first outer surface 312 in the first direction X can be 0.01 times, 0.02 times, 0.03 times, 0.05 times, 0.08 times, 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.15 times, 0.18 times, 0.2 times, 0.22 times, 0.25 times, 0.28 times, or 0.3 times of the maximum size D2 of the second sidewall plate 32 in the first direction X.

[0147] In this embodiment, on the one hand, the size of the protrusion 311 protruding from the first outer surface 312 in the first direction X is set to be greater than or equal to 0.01 of the maximum size of the second side wall plate 32 in the first direction X. This allows the protrusion 311 to have sufficient height to release the stress transmitted from the second side wall plate 32 to the top plate 31, which is beneficial to improving the stress release effect of the protrusion 311 and further alleviating the cracking or damage of the top plate 31 of the second housing body 30 during use. On the other hand, the size of the protrusion 311 protruding from the first outer surface 312 in the first direction X is set to be less than or equal to 0.3 of the maximum size of the second side wall plate 32 in the first direction X. This is beneficial to reduce the space occupied by the protrusion 311 in the first direction X, thereby optimizing the overall size of the battery device 100 in the first direction X and reducing the excessive difficulty in molding the protrusion 311.

[0148] According to some embodiments of this application, see Figure 4 As shown, in a projection plane perpendicular to the first direction X, the orthographic projection of the top plate 31 is rectangular, and the orthographic projection of the protrusion 311 extends along the diagonal of the orthographic projection of the top plate 31. That is, the protrusion 311 structure formed by the partial bulge of the top plate 31 is a strip structure extending in the direction of the diagonal extension of the first outer surface 312 of the top plate 31.

[0149] In this embodiment, by setting the orthographic projection of the protrusion 311 in the projection plane perpendicular to the first direction X as a structure extending along the diagonal of the top plate 31, the protrusion 311 formed on the top plate 31 is a structure that bulges in the diagonal region of the top plate 31. This structure can better release the torque stress transmitted from the first box body 20 to the second box body 30, thereby reducing the torque influence on the top plate 31 of the second box body 30 during use, which is beneficial to further alleviate the phenomenon of cracking or damage of the top plate 31 of the second box body 30 during use.

[0150] According to some embodiments of this application, the stiffness of the second box body 30 is less than that of the first box body 20. That is, the deformation resistance of the second box body 30 is less than that of the first box body 20, making the second box body 30 more prone to deformation than the first box body 20.

[0151] In this embodiment, the stiffness of the second box body 30 being less than that of the first box body 20 means that the stiffness of the material of the second box body 30 is less than that of the material of the first box body 20. That is, the first box body 20 and the second box body 30 are structures formed of different materials. For example, the first box body 20 needs to be equipped with a mounting structure to play a role in bearing and assembly. Therefore, the first box body 20 can be made of a metal material with higher stiffness, such as aluminum alloy or steel. Of course, the second box body 30 mainly plays the role of assembling the battery cell 10 in conjunction with the first box body 20. Therefore, the second box body 30 can be made of a non-metallic material with lower stiffness, such as glass fiber reinforced plastic or polyvinylidene fluoride and other polymer composite materials.

[0152] It should be noted that when measuring the stiffness of the material of the first box body 20 and the second box body 30, two specimens with the same shape and size can be made first. One specimen is made of the same material as the first box body 20, and the other specimen is made of the same material as the second box body 30. Then, the deformation of the two specimens is measured by the three-point bending method in the static method. The stiffness of the two specimens can be calculated from this, so as to obtain the stiffness of the material of the first box body 20 and the second box body 30.

[0153] In this embodiment, by setting the stiffness of the second box body 30 to be less than that of the first box body 20, the second box body 30 is made more easily deformable than the first box body 20. This allows the second box body 30 to better release stress during the transmission of stress on the second side wall panel 32, thereby reducing the stress transmitted from the first box body 20 to the top plate 31 of the second box body 30. On the other hand, when the second box body 30 is affected by the stress of the first box body 20, the resistance of the second box body 30 is reduced, allowing the second box body 30 to reduce the risk of damage or cracking during use through deformation and other means.

[0154] According to some embodiments of this application, see Figure 4 , Figure 7 and Figure 8 As 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 also includes a first sealing member 60, 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.

[0155] 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.

[0156] 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 along the second direction Y.

[0157] The first sealing element 60 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 60 can be various, such as rubber, plastic or silicone.

[0158] 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 element 60 between the first flange edge 322 and the first sidewall panel 22, the first sealing element 60 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 40 jointly defined by the first housing body 20 and the second housing body 30. As a result, the risk of water vapor or liquid impurities entering the assembly space 40 from the gap between the first flange edge 322 and the first sidewall panel 22 can be reduced during use, thereby improving the reliability and service life of the battery device 100.

[0159] According to some embodiments of this application, see Figure 7 As shown, a portion of the first flange edge directly abuts against the first side wall plate, and in the projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge, the orthographic projection of the area where the first flange edge directly abuts against the first side wall plate and the orthographic projection of the first seal are completely misaligned.

[0160] The first flange edge is in direct contact with the first side wall plate, meaning that the first flange edge is in direct contact with the first side wall plate in the stacking direction of the first side wall plate and the first flange edge.

[0161] In the projection plane perpendicular to the stacking direction of the first sidewall and the first flange edge, the orthographic projection of the area where the first flange edge directly abuts the first sidewall and the first sealing element is completely misaligned. That is, in the projection plane perpendicular to the stacking direction of the first sidewall and the first flange edge, the orthographic projection of the area where the first flange edge directly abuts the first sidewall and the first sealing element do not overlap, so that the first sealing element does not extend into the area where the first flange edge directly abuts the first sidewall.

[0162] In this embodiment, by setting the first flange edge and the first side wall plate to a direct contact structure, and completely misaligning the orthographic projection of the area where the first flange edge and the first side wall plate directly contact each other in a projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge with the orthographic projection of the first seal in a projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge, the first seal is a structure that does not extend to the area where the first flange edge and the first side wall plate directly contact each other. The battery device with this structure can reduce the damage or destruction to the first seal caused by the mutual compression of the first flange edge and the first side wall plate, which is beneficial to improving the service life and sealing reliability of the first seal. On the other hand, it can enable the first side wall plate to directly transfer the stress generated on the first box body to the second side wall plate through the first flange edge and then release it through the protrusion on the top plate, which is beneficial to reduce the phenomenon of stress concentration between the first box body and the second box body.

[0163] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, along the stacking direction of the first sidewall panel 22 and the first flange edge 322, one of the surfaces of the first flange edge 322 facing the first sidewall panel 22 and the first sidewall panel 22 facing the first flange edge 322 is provided with an abutment portion 3221, and the abutment portion 3221 directly abuts against the other. 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 60 are completely misaligned.

[0164] The abutment portion 3221 is a protruding structure on either the surface of the first flange edge 322 facing the first side wall plate 22 or the surface of the first side wall plate 22 facing the first flange edge 322. The abutment portion 3221 is provided on either the surface of the first flange edge 322 facing the first side wall plate 22 or the surface of the first side wall plate 22 facing the first flange edge 322, and the abutment portion 3221 directly abuts against the other. That is to say, the abutment portion 3221 can be a protruding structure on the first flange edge 322 or a protruding structure on the first side wall plate 22. If the abutment portion 3221 protrudes on the surface of the first flange edge 322 facing the first side wall plate 22, then the first flange edge 322 is in direct contact with the first side wall plate 22 through the abutment portion 3221. If the abutment portion 3221 protrudes on the surface of the first side wall plate 22 facing the first flange edge 322, then the first side wall plate 22 is in direct contact with the first flange edge 322 through the abutment portion 3221.

[0165] 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 60 are completely misaligned. That is, 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 60 do not overlap. Correspondingly, the first sealing member 60 does not extend between the abutment portion 3221 and the first sidewall panel 22 or the first flange edge 322. For example, in... Figure 7 In the middle, the first side wall plate 22 and the first flange edge 322 are stacked along the second direction Y. Correspondingly, the first sealing member 60 is located on one side of the abutment portion 3221 in the first direction X.

[0166] In this embodiment, by providing a protruding abutment portion on one of the first flange edge and the first side wall plate, and the abutment portion having a structure that directly abuts against the other, direct contact between the first flange edge and the first side wall plate is achieved. On the one hand, this reduces the difficulty of setting the first seal between the first flange edge and the first side wall plate while achieving direct contact between the first flange edge and the first side wall plate. On the other hand, it can further reduce the squeezing phenomenon caused by the first flange edge and the first side wall plate on the first seal, and facilitate the direct transfer of the stress generated on the first box body to the second side wall plate through the abutment portion, and then release it through the protrusion on the top plate.

[0167] In some embodiments, please continue to see Figure 7 and Figure 8As shown, 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 has a protruding abutment portion, and the abutment portion directly abuts against the first sidewall panel. That is to say, the abutment portion 3221 is a structure that protrudes from the surface of the first flange edge 322 facing the first sidewall panel 22, so that the first flange edge 322 is a structure that directly contacts the first sidewall panel 22 through the abutment portion 3221.

[0168] In this embodiment, by providing a protruding abutment portion on the surface of the first flange facing the first side wall panel that directly abuts against the first side wall panel, and by making the abutment portion a structure that directly contacts the first side wall panel and is misaligned with the first seal, the battery device with this structure can reduce the damage or destruction to the first seal caused by the mutual compression between the abutment portion and the first side wall panel, and can reduce the manufacturing and molding difficulty of the abutment portion. On the other hand, it is convenient for the first side wall panel to directly transfer the stress generated on the first box body to the second side wall panel through the abutment portion and then release it through the protrusion on the top plate, which helps to reduce the phenomenon of stress concentration between the first box body and the second box body.

[0169] In some embodiments, combined with Figure 2 and Figure 7 As shown, the battery device 100 also includes a first locking member 70, which passes through the abutment portion 3221 and locks the first flange edge 322 and the first side wall plate 22.

[0170] The first locking element 70 serves to connect the first flange edge 322 and the first side wall plate 22. The structure of the first locking element 70 can be various, such as a bolt or rivet. For example, in... Figure 7 In the middle, the abutment portion 3221 protrudes from the surface of the first flange edge 322 facing the first side wall plate 22, and the first locking member 70 is a bolt. The first locking member 70 passes through the first flange edge 322 and through the abutment portion 3221 along the stacking direction of the first side wall plate 22 and the first flange edge 322, and the first locking member 70 is screwed onto the first side wall plate 22.

[0171] Optionally, the first sidewall panel 22 has a mating portion 221 that is threadedly engaged with the first locking member 70. The mating portion 221 is threadedly engaged with the first locking member 70 to achieve the first locking member 70 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 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.

[0172] In this embodiment, by having the first locking member 70 pass through the abutment portion 3221 and lock the first flange edge 322 and the first side wall plate 22, the first flange edge 322 and the first side wall plate 22 can be connected to each other. The abutment portion 3221 can be tightly abutted against the first side wall plate 22 or the first flange edge 322. Thus, while assembling the first box body 20 and the second box body 30, it is also convenient for the first side wall plate 22 to directly transfer the stress generated on the first box body 20 to the second side wall plate 32 through the abutment portion 3221 and then release it through the protrusion 311 on the top plate 31. This helps to further reduce the phenomenon of stress concentration between the first box body 20 and the second box body 30.

[0173] According to some embodiments of this application, see Figure 7 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 60 is located between the limiting part 222 and the abutting part 3221.

[0174] 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 7 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.

[0175] The limiting portion 222 and the abutting portion 3221 are spaced apart, and the first sealing member 60 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 60 is a structure disposed between the limiting portion 222 and the abutting portion 3221. For example, in Figure 7 In the middle, the first side wall plate 22 and the first flange edge 322 are stacked along the second 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 60 is located between the abutment part 3221 and the limiting part 222 in the first direction X.

[0176] 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 60 is a structure disposed between the limiting part 222 and the abutting part 3221, so that the limiting part 222 and the abutting part 3221 can cooperate to play a certain assembly limiting role for the first sealing member 60, thereby reducing the phenomenon of the first sealing member 60 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 60.

[0177] According to some embodiments of this application, see Figure 7 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 60 and the orthographic projection of the bearing plate 21 are completely misaligned. That is, 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 60 and the orthographic projection of the bearing plate 21 do not overlap. Correspondingly, 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 60.

[0178] In this embodiment, by setting the orthographic projection of the first sealing element 60 in the projection plane perpendicular to the stacking direction of the first side wall plate 22 and the first flange edge 322 to be completely misaligned 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 60 and the support plate 21 do not have an overlapping relationship in the stacking direction of the first side wall plate 22 and the 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 60 through the first side wall plate 22. This reduces the risk of damage or failure of the first sealing element 60 during use and helps to improve the service life and sealing reliability of the first sealing element 60.

[0179] 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.

[0180] 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.

[0181] 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, on the one hand, the connection stability and reliability between the top plate 31 and the second side wall plate 32 can be improved, thereby enhancing the overall structural strength of the second box body 30. On the other hand, the stress transfer effect of the second side wall plate 32 to the top plate 31 can be improved, so that the stress can be further released through the protrusion 311, thereby reducing the phenomenon of stress concentration on the second side wall plate 32, which is beneficial to reducing the risk of damage or cracking of the second side wall plate 32 during use.

[0182] 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 second direction Y, and the second box body 30 may include two second side wall panels 32 arranged opposite each other along the second 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 third 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 third 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 second direction Y, and the third direction Z are perpendicular to each other.

[0183] The two second sidewalls 32 of the second box body 30 are respectively connected to the two ends of the top plate 31 in the second direction Y, so that the cross section of the second box body 30 perpendicular to the third direction Z has a "U" shape and the two ends of the second box body 30 in the third direction Z are open. Correspondingly, the two third sidewalls 23 of the first box body 20 are respectively used to block the two ends of the second box body 30 in the third direction Z. That is, the third sidewall 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 sidewalls 32, so that the cross section of the first box body 20 perpendicular to the second direction Y also has a "U" shape.

[0184] 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.

[0185] In this embodiment, the first box body 20 includes two first side wall panels 22 arranged opposite each other along the second direction Y, and the second box body 30 includes two second side wall panels 32 arranged opposite each other along the second 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 second 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 third 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 third 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 40 for accommodating the battery cell 10. The structure is simple and easy to assemble.

[0186] In some embodiments, see Figure 4 , Figure 5 and Figure 7 As shown, 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 second direction Y, and the first flange edge 322 and the first side wall panel 22 are stacked along the second direction Y.

[0187] 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 second direction Y is greater than the thickness dimension of the body portion 321 in the second direction Y.

[0188] 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 second 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 second 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.

[0189] In some embodiments, see Figure 7 As shown, along the second direction Y, the first sidewall panel 22 is located on the side of the first flange edge 322 facing the assembly space 40. That is, the two first sidewall panels 22 of the first box body 20 are located between the two second sidewall panels 32 of the second box body 30 in the second direction Y.

[0190] 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 70, the assembly difficulty of screwing the first locking member 70 onto the first side wall plate 22 can be reduced by setting the first side wall plate 22 on the side of the first flange edge 322 facing the assembly space 40 in the second direction Y.

[0191] 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 40 in the second 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 second 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 second 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.

[0192] 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 third 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 second 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.

[0193] The second box body 30 has two second flange edges 33 at both ends in the third direction Z. The second flange edges 33 connect the top plate 31 and the two second side wall plates 32. That is, the second box body 30 also includes two second flange edges 33 arranged at intervals in the third 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 third direction Z. The two ends of the top plate 31 in the third 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 third 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.

[0194] 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.

[0195] 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 second 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.

[0196] 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 sidewall 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 sidewall plates 32, and the two ends of the third sidewall plate 23 in the second 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.

[0197] 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.

[0198] 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.

[0199] In some embodiments, see Figure 4 and Figure 8 As shown, the first segment 331 and the top plate 31 are connected by a connecting portion 34. The top plate 31 has a first inner surface 313 facing the support plate 21 in the first direction X, and the first segment 331 has a second inner surface 3311 facing the support plate 21 in the first direction X. The second inner surface 3311 abuts against the third side wall plate 23, and the second inner surface 3311 and the first inner surface 313 are connected by the inner surface of the connecting portion 34. Along the first direction X, the first inner surface 313 is further away from the support plate 21 than the second inner surface 3311.

[0200] 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.

[0201] Along the first direction X, the first inner surface 313 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.

[0202] 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 313 of the top plate 31 is further away from the bearing plate 21 in the first direction X than the second inner surface 3311 of the first segment 331. This ensures that the arc segment 333 and other structures of the 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 40 jointly defined by the first box body 20 and the second box body 30. This reduces the assembly difficulty of the second box body 30 and the third side wall plate 23 of the first box body 20 while increasing the internal space of the battery device 100 for accommodating the battery cell 10.

[0203] 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 third direction Z.

[0204] 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.

[0205] In this embodiment, by connecting the two ends of the first flange edge 322 of the second side wall panel 32 in the third direction Z to the two second flange edges 33 located at the two ends of the top plate 31 in the third 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.

[0206] 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.

[0207] 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 second direction Y.

[0208] For example, the material of the second seal can be various, such as plastic, rubber or silicone.

[0209] 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 40 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 40 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.

[0210] 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.

[0211] 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.

[0212] 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 second direction Y can be reduced, thereby reducing the manufacturing difficulty of the first box body 20. On the other hand, the position of the first side wall panel 22 in the first direction X can be adjusted according to the actual situation, so as to adjust the size of the support surface 211 of the first side wall panel 22 protruding from the support plate 21 in the first direction X, which is beneficial to improving the applicability of the first box body 20.

[0213] 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.

[0214] For example, the third side wall panel 23 and the supporting plate 21 are connected by bolts.

[0215] 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.

[0216] 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 second direction Y, and the two ends of the reinforcing member 24 in the second direction Y are respectively connected to the two first side wall plates 22.

[0217] Among them, the reinforcing member 24 is a strip structure extending along the second direction Y, and the two ends of the reinforcing member 24 in the second direction Y are respectively connected to the two first side wall panels 22 of the first box body 20.

[0218] 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.

[0219] 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 second 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 second 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.

[0220] 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 third direction Z. Along the third direction Z, the battery cell 10 is disposed between the two reinforcing members 24.

[0221] 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 the two sides of the battery cells 10 respectively abut against two reinforcing members 24 in the third direction Z.

[0222] 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 third 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 for the battery cells 10 placed on the support plate 21 in the third direction Z, so as to reduce the risk of the battery cells 10 shaking or shifting along the third direction Z during use.

[0223] 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 9 , Figure 10 , Figure 11 and Figure 12 As shown, Figure 9 This is a schematic diagram of the structure of the battery device 100 provided in some embodiments of this application. Figure 10 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 11 This is a schematic diagram of the structure of the second housing body 30 of the battery device 100 provided in some embodiments of this application. Figure 12 This is a schematic diagram of the structure of the first housing body 20 of the battery device 100 provided in some embodiments of this application. The first housing body 20 may include a plurality of first side wall panels 22, which surround the support plate 21 and are connected end to end in sequence. The second housing body 30 may include a plurality of second side wall panels 32, which surround the top plate 31 and are connected end to end in sequence, with each second side wall panel 32 connected to a first side wall panel 22.

[0224] 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.

[0225] 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 40 for accommodating the battery cell 10. The structure is simple and easy to implement.

[0226] According to some embodiments of this application, refer to Figure 10 , Figure 11 and Figure 12 Please refer to further details. Figure 13 and Figure 14 , Figure 13 A cross-sectional view of the second housing body 30 of the battery device 100 provided in some embodiments of this application, perpendicular to the third direction Z. Figure 14 The first housing body 20 of the battery device 100 provided in some embodiments of this application is a cross-sectional view perpendicular to the third 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.

[0227] 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.

[0228] 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.

[0229] In some embodiments, see Figure 11As shown, the first flange edges 322 of multiple second sidewall plates 32 are connected end to end in sequence.

[0230] 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.

[0231] According to some embodiments of this application, refer to Figure 12 and Figure 14 Please refer to further details. Figure 15 As shown, Figure 15 for Figure 14 The diagram shows a partial enlarged view of point B on the first box body 20. 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.

[0232] 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.

[0233] For example, the body 223 and the flange 224 of the first side panel 22 are integrally formed.

[0234] 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.

[0235] In some embodiments, see Figure 14 and Figure 15 As shown, the first side wall panel 22 and the bearing plate 21 are integrally formed.

[0236] 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.

[0237] 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.

[0238] According to some embodiments of this application, see Figure 7 as well as Figure 15 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] For example, the material of the heat conductor 90 can be various, such as silicone, silicone grease or silicone rubber.

[0243] 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.

[0244] 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.

[0245] The electrical device can be any of the aforementioned devices or systems that utilize battery device 100.

[0246] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0247] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

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. At least a portion of the top plate bulges outward from the support plate and forms a protrusion, and the cross-section of the protrusion perpendicular to its extending direction is arc-shaped.

2. The battery device according to claim 1, characterized in that, The top plate has a first outer surface that is opposite to the supporting plate in the first direction, and the protrusion protrudes from the first outer surface; Wherein, along the first direction, the ratio of the size of the protrusion protruding from the first outer surface to the maximum size of the second sidewall plate is greater than or equal to 0.01 and less than or equal to 0.

3.

3. The battery device according to claim 1, characterized in that, In a projection plane perpendicular to the first direction, the orthographic projection of the top plate is rectangular, and the orthographic projection of the protrusion extends along the diagonal of the orthographic projection of the top plate.

4. The battery device according to claim 1, characterized in that, The stiffness of the second box body is less than that of the first box body.

5. The battery device according to claim 1, 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 and the first sidewall panel are stacked together. 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.

6. The battery device according to claim 5, characterized in that, The first flange edge directly abuts against the first side wall plate, and in the projection plane perpendicular to the stacking direction of the first side wall plate and the first flange edge, the orthographic projection of the area where the first flange edge directly abuts against the first side wall plate is completely misaligned with the orthographic projection of the first seal.

7. The battery device according to claim 6, characterized in that, Along the stacking direction of the first sidewall plate and the first flange edge, one of the surfaces of the first flange edge facing the first sidewall plate and the first sidewall plate facing the first flange edge is provided with an abutting portion, and the abutting portion directly abuts against the other. 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 are completely misaligned.

8. The battery device according to claim 7, 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 the abutting portion, and the abutting portion directly abuts against the first sidewall panel.

9. The battery device according to claim 7, characterized in that, The battery device further includes a first locking member, which passes through the abutment portion and locks the first flange edge and the first side wall plate.

10. The battery device according to claim 7, 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.

11. The battery device according to claim 6, 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 are completely misaligned.

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

13. The battery device according to any one of claims 1-12, characterized in that, The first box body includes two first side wall panels arranged opposite each other along the second direction, and the second box body includes two second side wall panels arranged opposite each other along the second direction, with each second side wall panel connected to one of the first side wall panels; The first box body further includes two third side wall panels arranged opposite each other along a third direction. Both 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 third direction, and 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.

14. The battery device according to claim 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. The thickness direction of the first flange edge is parallel to the second direction, and the first flange edge and the first sidewall panel are stacked along the second direction.

15. The battery device according to claim 14, characterized in that, Along the second direction, the first sidewall plate is located on the side of the first flange facing the assembly space.

16. The battery device according to claim 13, characterized in that, The second box body is provided with second flange edges at both ends in the third direction, and the second flange edges connect the top plate and the two second side wall plates; Wherein, both ends of the third sidewall in the second direction and the end of the third sidewall away from the bearing plate in the first direction are connected to the second flange edge.

17. The battery device according to claim 16, 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 ends of the third sidewall plate in the second direction are respectively connected to the two second segments. 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.

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

19. The battery device according to claim 16, 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 third direction.

20. The battery device according to claim 16, 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.

21. The battery device according to claim 13, characterized in that, The first side wall panel and the supporting plate are separately arranged but connected.

22. The battery device according to claim 13, characterized in that, The third side wall panel is detachably connected to the supporting plate.

23. The battery device according to claim 13, 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 second direction, and its two ends in the second direction are respectively connected to the two first side wall plates.

24. The battery device according to claim 23, characterized in that, The first housing body includes two reinforcing members, which are arranged at intervals along the third direction, and the battery cell is disposed between the two reinforcing members along the third direction.

25. The battery device according to any one of claims 1-12, 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.

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 first direction, and the first flange edge and the first sidewall panel are stacked along the first direction.

27. The battery device according to claim 26, characterized in that, The first flange edges of multiple second sidewall panels are connected end to end in sequence.

28. The battery device according to claim 26, 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.

29. The battery device according to claim 25, characterized in that, The first side wall panel and the bearing plate are integrally formed.

30. 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.

31. The battery device according to claim 30, 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.

32. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-31, the battery device being used to provide electrical energy.

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