Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a battery monomer assembly, a box body and a cover. A bottom wall is used for supporting the battery monomer assembly along a second direction. A first side wall, a second side wall and a beam structure are connected to one side of the bottom wall facing the battery monomer assembly. The first side wall, the beam structure and the second side wall are sequentially and spacedly arranged along a first direction. The battery monomer assembly is located between the first side wall and the beam structure, and the two ends of the battery monomer assembly abut against the first side wall and the beam structure respectively. The cover is connected to the first side wall and the second side wall. The cover and the box body form an accommodating space. The battery monomer assembly is arranged in the accommodating space. The cover and the box body are sealingly connected to form a ring-shaped sealing area. The bottom wall is provided with a mounting part. On the same projection plane perpendicular to the second direction, the orthographic projection of the mounting part is located in the space surrounded by the orthographic projection of the sealing area. The technical scheme of the application can improve the energy density of the battery device.

Description

Technical Field

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

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

[0003] Energy density is a crucial factor in the manufacturing process of battery devices. Therefore, improving the energy density of battery devices is a pressing technical challenge that needs to be addressed. Utility Model Content

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

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

[0006] In a first aspect, embodiments of this application provide a battery device, which includes a battery cell assembly, a housing body, and a cover. The battery cell assembly includes a plurality of battery cells stacked along a first direction; the housing body includes a bottom wall, a first side wall, a second side wall, and a beam structure. The bottom wall supports the battery cell assembly along a second direction. The first side wall, the second side wall, and the beam structure are all connected to the side of the bottom wall facing the battery cell assembly. The first side wall, the beam structure, and the second side wall are arranged sequentially at intervals along the first direction. The battery cell assembly is located between the first side wall and the beam structure. Both ends of the battery cell assembly abut against the first side wall and the beam structure, respectively. The second direction is perpendicular to the first direction. The cover is connected to the first side wall and the second side wall. The cover and the housing body enclose a receiving space, and the battery cell assembly is disposed within the receiving space. The cover and the housing body are sealed together to form an annular sealing area. The bottom wall is provided with a mounting part. On the same projection plane perpendicular to the second direction, the orthographic projections of all mounting parts are located within the space enclosed by the orthographic projections of the sealing area. The mounting part is used to connect to the device body of the electrical device.

[0007] According to an embodiment of this application, the battery device includes a battery cell assembly comprising multiple battery cells stacked along a first direction to enable the battery device to have a high power capacity. A housing body and a cover constitute the housing of the battery device, and the housing body and cover enclose a receiving space for accommodating the battery cell assembly. The battery cell assembly is disposed within the receiving space to protect it. The housing body includes a bottom wall, a first side wall, a second side wall, and a beam structure. The bottom wall supports the battery cell assembly along a second direction to achieve assembly and positioning of the battery cell assembly. The first side wall, the beam structure, and the second side wall are arranged sequentially at intervals along the first direction, and the cover is connected to the first and second side walls to facilitate connection between the cover and the housing body. The enclosure forms the receiving space. The first and second side walls are the outermost side beams of the box body along the first direction. The first side wall functions as both a side beam and an expansion beam. By abutting the two ends of the battery cell assembly against the first side wall and the beam structure respectively, the first side wall and the beam structure work together to constrain the expansion and deformation of the battery cell assembly, which helps to improve the reliability of the battery cell assembly. Furthermore, the setting of the first side wall can save space in the first direction of the box body, so that the inside of the box body has a larger receiving space in the first direction. This can increase the size ratio of the battery cell assembly in the box body along the first direction, improve the space utilization rate inside the box body in the first direction, and thus improve the energy density of the battery device. Furthermore, the annular sealing area formed by the sealing connection between the cover and the box body isolates the containment space from the external environment, thereby reducing the risk of external liquids and dust entering the containment space. The mounting part is set on the bottom wall, and on the same projection plane perpendicular to the second direction, the orthographic projection of the mounting part is located within the space enclosed by the orthographic projection of the sealing area. On the one hand, it can eliminate the need to set up a mounting beam in the containment space, thereby improving the space utilization rate inside the box. On the other hand, it can utilize the space in the second direction, eliminating the need to set up a mounting beam on the periphery of the box body, reducing the space occupied by the battery device in the plane perpendicular to the second direction, and facilitating the improvement of the energy density of the battery device.

[0008] According to some embodiments of this application, the cover includes a first sealing surface and a second sealing surface spaced apart along a third direction. Along the third direction, the box body is located between the first sealing surface and the second sealing surface. The first sealing surface is sealed to the box body, and the second sealing surface is sealed to the box body. Both the first sealing surface and the second sealing surface intersect with the third direction. On the same projection plane perpendicular to the second direction, along the third direction, the orthographic projections of all mounting parts are located between the orthographic projections of the first sealing surface and the second sealing surface. The first direction, the second direction, and the third direction are perpendicular to each other.

[0009] In the above scheme, the first sealing surface is sealed to the box body, and the second sealing surface is sealed to the box body. Both the first and second sealing surfaces intersect with the third direction, so that the cover and the box body are sealed to each other in the third direction. The cover occupies less space in the third direction, so as to reduce the size of the battery device in the third direction. Furthermore, on the same projection plane perpendicular to the second direction, along the third direction, the orthographic projection of the mounting part is located between the orthographic projection of the first sealing surface and the orthographic projection of the second sealing surface. The mounting part is set in the space of the box body in the third direction. The mounting part does not exceed the box body in the third direction, so that the size of the battery device in the third direction is smaller.

[0010] According to some embodiments of this application, at least one of the first sidewall and the beam structure is integrally formed with at least a portion of the bottom wall.

[0011] In the above scheme, at least a portion of the first sidewall and the bottom wall are integrally formed, giving the structure formed by the first sidewall and the bottom wall high overall strength. This improves the constraint effect of the first sidewall on the battery cell assembly. The portion of the first sidewall used to resist the expansion and deformation of the battery cell assembly can be designed to have a smaller dimension in the first direction, further reducing the space occupied by the first sidewall in the first direction and increasing the energy density of the battery device. Similarly, the beam structure and the bottom wall are at least a portion integrally formed, giving the structure formed by the beam structure and the bottom wall high overall strength. This improves the constraint effect of the beam structure on the battery cell assembly. The portion of the beam structure used to resist the expansion and deformation of the battery cell assembly can be designed to have a smaller dimension in the first direction, further reducing the space occupied by the beam structure in the first direction and increasing the energy density of the battery device.

[0012] According to some embodiments of this application, the bottom wall includes a first sub-bottom wall and a second sub-bottom wall that are connected to each other, a first side wall is connected to the first sub-bottom wall, and a beam structure is connected to the second sub-bottom wall; the first side wall is integrally formed with the first sub-bottom wall, and / or the beam structure is integrally formed with the second sub-bottom wall.

[0013] In the above scheme, the first sidewall and the first sub-bottom wall are integrally formed, which gives the structure formed by the first sidewall and the first sub-bottom wall high overall strength, so as to improve the constraint effect of the first sidewall on the battery cell assembly. The part of the first sidewall used to resist the expansion and deformation of the battery cell assembly can be designed to be smaller in the first direction, further reducing the space occupied by the first sidewall in the first direction and improving the energy density of the battery device. The beam structure and the second sub-bottom wall are integrally formed, which gives the structure formed by the beam structure and the second sub-bottom wall high overall strength, so as to improve the constraint effect of the beam structure on the battery cell assembly. The part of the beam structure used to resist the expansion and deformation of the battery cell assembly can be designed to be smaller in the first direction, further reducing the space occupied by the beam structure in the first direction and improving the energy density of the battery device.

[0014] According to some embodiments of this application, the bottom wall further includes a third sub-bottom wall, the first sub-bottom wall, the third sub-bottom wall and the second sub-bottom wall are arranged sequentially along a first direction, and the third sub-bottom wall connects the first sub-bottom wall and the second sub-bottom wall; a flow channel is formed inside the third sub-bottom wall, and the flow channel is used to contain the heat exchange medium.

[0015] In the above scheme, the first sub-bottom wall, the third sub-bottom wall, and the second sub-bottom wall are arranged sequentially along the first direction, and the third sub-bottom wall connects the first and second sub-bottom walls, which facilitates processing and manufacturing. Along the second direction, the third sub-bottom wall has a large overlap area with the battery cell assembly. By accommodating the heat exchange medium in the flow channel of the third sub-bottom wall, the thermal management components are integrated with the third sub-bottom wall. On the one hand, heat exchange with the battery cell assembly can be achieved through the heat exchange medium, regulating the temperature of the battery cell assembly and improving its reliability; on the other hand, the space utilization rate inside the housing in the second direction can be improved, facilitating an increase in the energy density of the battery device.

[0016] According to some embodiments of this application, the third sub-bottom wall includes a bottom wall body and a protrusion, the protrusion protruding from the bottom wall body on the side near the second sub-bottom wall; the second sub-bottom wall is provided with a first groove on the side near the third sub-bottom wall, and at least a portion of the protrusion is disposed in the first groove.

[0017] In the above scheme, the bottom wall body is used to support the battery cell assembly, and most of the flow channel area is located in the bottom wall body to facilitate heat exchange with the battery cell assembly; the protrusion protrudes from the bottom wall body on the side near the second sub-bottom wall so that the protrusion can cooperate with the first groove, so that the third sub-bottom wall and the second sub-bottom wall have a large connection area, which can improve the connection reliability between the third sub-bottom wall and the second sub-bottom wall.

[0018] According to some embodiments of this application, the protrusion is provided with a flow channel inlet and a flow channel outlet. The flow channel inlet is connected to the flow channel, and the flow channel outlet is connected to the flow channel. On the same projection plane perpendicular to the second direction, along the first direction, the orthographic projection of the flow channel inlet and the orthographic projection of the flow channel outlet are located between the orthographic projection of the beam structure and the orthographic projection of the second sidewall.

[0019] In the above scheme, the orthographic projection of the flow channel inlet and the orthographic projection of the flow channel outlet are located between the orthographic projection of the beam structure and the orthographic projection of the second side wall. The space between the beam structure and the second side wall is used to facilitate the connection of the flow channel inlet and the flow channel outlet to the connecting pipes, which facilitates assembly and disassembly. In addition, it can reduce the risk of interference between the connecting pipes and the battery cell assembly.

[0020] According to some embodiments of this application, there are two protrusions, which are spaced apart along a third direction. The flow channel inlet is located on one protrusion, and the flow channel outlet is located on the other protrusion. There are two first grooves, which are spaced apart along a third direction. One protrusion is located in one first groove, and the third direction, the second direction, and the first direction are perpendicular to each other.

[0021] In the above scheme, the flow channel inlet and outlet are respectively located on two protrusions, which reduces the amount of heat conduction between the heat exchange medium and the flow channel outlet due to their close proximity. This facilitates a longer flow path for the heat exchange medium within the flow channel, and promotes heat exchange between the heat exchange medium and the battery cell assembly. At the same time, the combination of the two protrusions and the two first grooves increases the connection area between the third sub-bottom wall and the second sub-bottom wall, thereby improving the reliability of the connection between the third sub-bottom wall and the second sub-bottom wall.

[0022] According to some embodiments of this application, the battery device further includes a first connector and a second connector, which are respectively disposed on the second side wall; the battery device further includes a first connecting pipe and a second connecting pipe, which are both disposed between the beam structure and the second side wall, the first connecting pipe connecting the flow channel inlet and the first connector, and the second connecting pipe connecting the flow channel outlet and the second connector.

[0023] In the above scheme, the first joint and the second joint are respectively set on the second side wall to facilitate connection with external pipes; the first connecting pipe and the second connecting pipe are both set between the beam structure and the second side wall, and the first connecting pipe connects the flow channel inlet and the first joint, and the second connecting pipe connects the flow channel outlet and the second joint to facilitate the connection between the flow channel in the third sub-side wall and the external pipe, which facilitates the input and output of the heat exchange medium.

[0024] According to some embodiments of this application, the first sub-bottom wall is welded to the third sub-bottom wall, and the second sub-bottom wall is welded to the third sub-bottom wall.

[0025] In the above scheme, the first sub-bottom wall and the third sub-bottom wall are welded together, which makes the connection between the first sub-bottom wall and the third sub-bottom wall firm and can improve the connection reliability between the first sub-bottom wall and the third sub-bottom wall; the second sub-bottom wall and the third sub-bottom wall are welded together, which makes the connection between the second sub-bottom wall and the third sub-bottom wall firm and can improve the connection reliability between the second sub-bottom wall and the third sub-bottom wall.

[0026] According to some embodiments of this application, the first sub-bottom wall and the third sub-bottom wall are connected by friction stir welding, and the second sub-bottom wall and the third sub-bottom wall are connected by friction stir welding.

[0027] In the above scheme, by connecting the first and third sub-bottom walls using friction stir welding, the welding strength can be enhanced, resulting in a structure with higher strength after welding, and further improving the connection reliability between the first and third sub-bottom walls. Similarly, by connecting the second and third sub-bottom walls using friction stir welding, the welding strength can be enhanced, resulting in a structure with higher strength after welding, and further improving the connection reliability between the second and third sub-bottom walls.

[0028] According to some embodiments of this application, the battery device further includes a third direction, which is perpendicular to the first direction and the second direction; the first sidewall and the first sub-bottom wall are integrally extruded along the third direction, and the interior of the first sidewall has a first cavity extending along the third direction and penetrating both ends; and / or, the beam structure and the second sub-bottom wall are integrally extruded along the third direction, and the interior of the beam structure has a second cavity extending along the third direction and penetrating both ends.

[0029] In the above design, the first cavity penetrates the first sidewall along a third direction and has a large volume. On the one hand, the first sidewall has a lighter weight, which helps reduce the overall weight of the battery device; on the other hand, the first sidewall helps absorb the expansion force of the individual battery cells. The second cavity penetrates the beam structure along a third direction and has a large volume. On the one hand, the beam structure has a lighter weight, which helps reduce the overall weight of the battery device; on the other hand, the beam structure helps absorb the expansion force of the individual battery cells.

[0030] According to some embodiments of this application, the first cavity extends along a third direction so that the first sidewall forms a first opening and a second opening at its two ends in the third direction, respectively; the box body also includes a first sealing plate and a second sealing plate, the first sealing plate is connected to the first sidewall and closes the first opening, the second sealing plate is connected to the first sidewall and closes the second opening, and the cover is at least partially used for sealing cooperation with the first sealing plate and the second sealing plate.

[0031] In the above scheme, the first sealing plate closes the first opening and is connected to the first side wall. When the box body and the lid are connected, the first sealing plate can be used to connect with the lid, so that there is a large connection area between the box body and the lid, which facilitates the improvement of the connection reliability and sealing performance between the box body and the lid. The second sealing plate closes the second opening and is connected to the first side wall. When the box body and the lid are connected, the second sealing plate can be used to connect with the lid, so that there is a large connection area between the box body and the lid, which facilitates the improvement of the connection reliability and sealing performance between the box body and the lid.

[0032] According to some embodiments of this application, the cover includes a top wall, a third side wall, and a fourth side wall. The top wall and the bottom wall are disposed opposite each other along a second direction, and the third side wall and the fourth side wall are disposed opposite each other along a third direction. The top wall connects the third side wall and the fourth side wall. The third side wall is located on the side of the first sealing plate opposite to the second sealing plate and is connected to the first sealing plate. The fourth side wall is located on the side of the second sealing plate opposite to the first sealing plate and is connected to the second sealing plate.

[0033] In the above scheme, the third sidewall is located on the side of the first sealing plate opposite to the second sealing plate, and the third sidewall is connected to the side of the first sealing plate opposite to the second sealing plate. The fourth sidewall is located on the side of the second sealing plate opposite to the first sealing plate, and the fourth sidewall is connected to the side of the second sealing plate opposite to the first sealing plate. This makes the sealing interface between the cover and the box body occupy less space in the third direction, so as to improve the space utilization rate of the box in the third direction and facilitate the improvement of the energy density of the battery device.

[0034] According to some embodiments of this application, the box body also includes a tensioning member, the two ends of which are respectively connected to the first side wall and the beam structure.

[0035] In the above scheme, the two ends of the tensioning member are connected to the first sidewall and the beam structure respectively, so as to constrain the expansion deformation of the battery cell assembly through the first sidewall and the beam structure, thereby improving the reliability of the battery cell assembly.

[0036] According to some embodiments of this application, along the second direction, the tensioning member is located on the side of the battery cell assembly away from the bottom wall.

[0037] In the above scheme, the two ends of the tensioning member are respectively connected to the first side wall and the beam structure, and the tensioning member is located on the side of the battery cell assembly away from the bottom wall along the second direction. The tensioning member can tighten the first side wall and the beam structure to constrain the expansion force of the battery cell along the first direction, assist the first side wall and the beam structure in resisting the deformation of the battery cell, reduce the risk of damage to the first side wall and the beam structure due to the expansion of the battery cell, and facilitate the improvement of the reliability of the battery cell assembly.

[0038] According to some embodiments of this application, a first surface and a second surface are provided at one end of the first sidewall away from the bottom wall, and the first surface is recessed relative to the second surface in a direction closer to the bottom wall; along the first direction, the first surface is closer to the battery cell assembly than the second surface, the tensioning member is connected to the first surface, and the cover is sealed to the second surface.

[0039] In the above scheme, both the first surface and the second surface are located at the end of the first sidewall away from the bottom wall, and the first surface is recessed towards the bottom wall relative to the second surface. The tensioning member is connected to the first surface, and the cover is sealed to the second surface. This can reduce the risk of interference between the tensioning member and the cover. At the same time, it allows the size of the battery device in the second direction to be designed to be smaller, which is conducive to improving the energy density of the battery device.

[0040] According to some embodiments of this application, a battery cell includes a housing and two electrode terminals. The housing includes a first wall, and the two electrode terminals are spaced apart on the first wall along a third direction. The first wall includes a shoulder region located outside the two electrode terminals along a third direction. A tensioning member is disposed in the shoulder region, and the third direction, the second direction, and the first direction are perpendicular to each other.

[0041] In the above scheme, two electrode terminals are spaced apart on the first wall along a third direction to facilitate connection with external conductive components (such as busbar components) through the two electrode terminals; along the third direction, the first wall can be provided with structures such as injection holes and pressure relief mechanisms in the area between the two electrode terminals, and the tensioning member is provided in the shoulder area to reduce the risk of interference between the tensioning member and other structures on the first wall (such as injection holes and pressure relief mechanisms).

[0042] According to some embodiments of this application, the tensioner is attached to the shoulder area.

[0043] In the above scheme, the tensioning member is connected to the shoulder area. On the one hand, this changes the previous force transmission path: battery cell expansion - tendency of the first sidewall and beam structure to shift - tensioning member tightening. Instead, when the battery cell expands, the tensioning member transmits the force that restricts the expansion of the battery cell through the connection with the battery cell, further reducing the risk of damage to the first sidewall and beam structure due to the expansion of the battery cell. On the other hand, it can restrict the movement of the battery cell away from the bottom wall, making it easier to resist the impact on the battery device and improve the reliability of the battery device.

[0044] According to some embodiments of this application, the tensioning member includes a base and an insulating member. The base is a metal member, the insulating member has a receiving groove, at least a portion of the base is received in the receiving groove, the insulating member is located between the base and the battery cell, and the insulating member is bonded to the shoulder area.

[0045] In the above scheme, the substrate is a metal part, which facilitates the improvement of the overall strength of the tensioning part and the connection reliability between the tensioning part and the first sidewall; at least part of the substrate is accommodated in the receiving groove, and the insulating part is located between the substrate and the battery cell, which facilitates the insulation and isolation between the substrate and the battery cell and reduces the risk of short circuit between the positive and negative electrodes; the insulating part is bonded to the shoulder area, which can improve the connection stability between the insulating part and the battery cell.

[0046] According to some embodiments of this application, a battery cell assembly includes a first battery cell assembly and a second battery cell assembly, the first battery cell assembly and the second battery cell assembly being arranged along a third direction, and both the first battery cell assembly and the second battery cell assembly including a plurality of battery cells stacked along a first direction; the battery cells in the first battery cell assembly have a first shoulder region adjacent to the second battery cell assembly, and the battery cells in the second battery cell assembly have a second shoulder region adjacent to the first battery cell assembly; the tensioning member includes a first tensioning member, which is disposed in at least one of the first shoulder region and the second shoulder region.

[0047] In the above scheme, the first tensioning member is disposed in at least one of the first shoulder region and the second shoulder region, so that the first tensioning member has a better binding effect on the battery cells of the first battery cell assembly and / or the battery cells of the second battery cell assembly.

[0048] According to some embodiments of this application, the first tensioning member has a first end connected to a first sidewall; the battery device further includes a first busbar configured to avoid the first end and electrically connected to a first battery cell assembly and a second battery cell assembly.

[0049] In the above scheme, the first busbar is electrically connected to the first battery cell assembly and the second battery cell assembly to combine the electrical energy of the first battery cell assembly and the second battery cell assembly; the first busbar is configured to avoid the first end, which can reduce the risk of interference between the first busbar and the first tensioning member.

[0050] According to some embodiments of this application, a second groove is provided on a first surface, and the second groove is located between the first end and the second surface along a first direction; the first busbar component includes a first connecting part, a second connecting part and a third connecting part, the first connecting part is electrically connected to a first battery cell assembly, the second connecting part is electrically connected to a second battery cell assembly, the third connecting part connects the first connecting part and the second connecting part, and at least a portion of the third connecting part is located in the second groove.

[0051] In the above solution, the second groove is located between the first end and the second surface, which can utilize the space of the first sidewall in the first direction to reduce the space occupied by the second groove in the first direction; at least a part of the third connecting part is located in the second groove, which can utilize the internal space of the first sidewall to reduce the space occupied by the third connecting part in the second direction, thereby reducing the risk of interference between the first busbar component and the cover.

[0052] According to some embodiments of this application, the first tensioning member has a first end connected to a first sidewall; the battery device further includes a first busbar for electrically connecting a first battery cell assembly and a second battery cell assembly; along a second direction, the first end is located on the side of the first busbar away from the battery cell assembly, an insulating member is provided between the first end and the first busbar, and / or, an elastic member is provided between the first end and the first busbar.

[0053] In the above scheme, along the second direction, the first end is located on the side of the first busbar component away from the battery cell assembly. The first end and the first busbar component share the space in the second direction. The first tensioning member can constrain the first busbar component to move in the direction away from the battery cell assembly, thereby improving the connection reliability between the first busbar component and the battery cell assembly. Furthermore, by providing an insulating member between the first end and the first busbar component, the risk of short circuit between the first end and the first busbar component can be reduced. By providing an elastic member between the first end and the first busbar component, the force applied by the first end to the first busbar component can be buffered, reducing the risk of damage to the first busbar component and improving the service life of the first busbar component.

[0054] According to some embodiments of this application, the tensioning member further includes a first side plate and a second side plate disposed opposite to each other along a third direction. Along the third direction, the first side plate and the second side plate are respectively located on both sides of the battery cell assembly. The two ends of the first side plate are respectively connected to the first side wall and the second side wall, and the first side plate is connected to the beam structure. The two ends of the second side plate are respectively connected to the first side wall and the second side wall, and the second side plate is connected to the beam structure. The third direction, the second direction and the first direction are perpendicular to each other.

[0055] In the above scheme, the first side plate and the second side plate are located on both sides of the battery cell assembly along a third direction. The two ends of the first side plate are connected to the first side wall and the second side wall, respectively, and the first side plate is connected to the beam structure. The two ends of the second side plate are connected to the first side wall and the second side wall, respectively, and the second side plate is connected to the beam structure. This allows the first side plate, the first side wall, the second side plate, and the second side wall, together with the cover, to form an accommodating space to accommodate the battery cell assembly. At the same time, the first side plate connects the first side wall and the beam structure, and the second side plate connects the first side wall and the beam structure. This can tighten the first side wall and the beam structure, resist the expansion force of the battery cell assembly, improve the constraint effect on the expansion deformation of the battery cell assembly, and thus improve the reliability of the battery device.

[0056] According to some embodiments of this application, a first cavity is formed inside the first sidewall, and a first opening and a second opening are formed at both ends of the first sidewall in the third direction, both of which are connected to the first cavity; a second cavity is formed inside the beam structure, and a third opening and a fourth opening are formed at both ends of the beam structure in the third direction, both of which are connected to the second cavity; a first side plate closes the first opening and the third opening; and a second side plate closes the second opening and the fourth opening.

[0057] In the above design, a first cavity is formed inside the first sidewall to reduce its weight, and a second cavity is formed inside the beam structure to reduce its weight, thereby reducing the overall weight of the battery device. The first side plate closes the first and third openings, and has a large connection area with both the first sidewall and the beam structure, improving the reliability of the connection between the first side plate and these components. The second side plate closes the second and fourth openings, also having a large connection area with both the first and first sidewalls and the beam structure, further improving the reliability of the connection. Simultaneously, the first and second side plates can serve as side beams of the housing, and the closing of the first and third openings by the first side plate and the second and fourth openings by the second side plate also improves the sealing performance of the housing.

[0058] According to some embodiments of this application, a first insert and a second insert are provided on the side of the first side plate facing the second side plate, at least a portion of the first insert is embedded in a first opening, and at least a portion of the second insert is embedded in a third opening; a third insert and a fourth insert are provided on the side of the second side plate facing the first side plate, at least a portion of the third insert is embedded in a second opening, and at least a portion of the fourth insert is embedded in a fourth opening.

[0059] In the above scheme, at least a portion of the first insert is embedded in the first opening, and at least a portion of the second insert is embedded in the third opening, further improving the connection reliability between the first side plate and the first side wall and the beam structure, and improving the constraint effect on the expansion and deformation of the battery cell assembly; at least a portion of the third insert is embedded in the second opening, and at least a portion of the fourth insert is embedded in the fourth opening, further improving the connection reliability between the second side plate and the first side wall and the beam structure, improving the constraint effect on the expansion and deformation of the battery cell assembly, thereby improving the reliability of the battery device.

[0060] According to some embodiments of this application, the first side plate includes a plurality of first sub-side plates, which are distributed sequentially along a first direction, and adjacent first sub-side plates are connected to each other; the second side plate includes a plurality of second sub-side plates, which are distributed sequentially along a first direction, and adjacent second sub-side plates are connected to each other.

[0061] In the above scheme, when the size of the battery device in the first direction is large, the size of the first side plate and the second side plate in the first direction is also large, and the processing and manufacturing difficulty of the first side plate and the second side plate is high. In this embodiment, by dividing the first side plate into multiple first sub-side plates and the second side plate into multiple second sub-side plates, the processing and manufacturing difficulty can be reduced. At the same time, two adjacent first sub-side plates are connected to each other to give the first side plate high overall strength; two adjacent second sub-side plates are connected to each other to give the second side plate high overall strength. This facilitates the improvement of the structure composed of the first side plate, the first side wall, the second side plate and the beam structure to resist the expansion of the battery cell assembly, so as to constrain the expansion deformation of the battery cell assembly.

[0062] According to some embodiments of this application, two adjacent first sub-side plates are mortised and tenoned together, and two adjacent second sub-side plates are mortised and tenoned together.

[0063] In the above scheme, the two adjacent first sub-side plates are connected by mortise and tenon joints, which further improves the overall strength of the first side plate. The two adjacent second sub-side plates are also connected by mortise and tenon joints, which further improves the overall strength of the second side plate. This improves the resistance of the structure composed of the first side plate, the first side wall, the second side plate and the beam structure to the expansion resistance of the battery cell assembly, and improves the reliability of the battery device.

[0064] According to some embodiments of this application, the battery cell assembly includes a first battery cell assembly and a second battery cell assembly, which are arranged along a third direction; the tensioning member also includes a third side plate, which is located between the first battery cell assembly and the second battery cell assembly along the third direction, and the third side plate connects the first side wall and the beam structure.

[0065] In the above scheme, the first battery cell assembly and the second battery cell assembly are arranged along a third direction, and the third side plate is disposed between the first battery cell assembly and the second battery cell assembly to separate the first battery cell assembly and the second battery cell assembly. At the same time, the third side plate connects the first side wall and the beam structure, which can improve the expansion resistance of the first side wall and the beam structure and facilitate the constraint of the expansion deformation of the battery cell assembly.

[0066] According to some embodiments of this application, a first sidewall is provided with a first through hole, which penetrates the first sidewall along a first direction; a beam structure is provided with a second through hole, which penetrates the beam structure along a first direction; and a third side plate passes through the first and second through holes.

[0067] In the above scheme, the first through hole penetrates the first side wall along the first direction, the second through hole penetrates the beam structure along the first direction, and the third side plate passes through the first and second through holes to facilitate the assembly of the third side plate with the first side wall and the beam structure, thereby improving assembly efficiency.

[0068] According to some embodiments of this application, a fifth insert is provided at one end of the third side plate, and a third groove is provided on the side of the first side wall opposite to the battery cell assembly. The third groove communicates with the first through hole, and at least a portion of the fifth insert is embedded in the third groove.

[0069] In the above scheme, by embedding at least a portion of the fifth insert into the third groove, the third side plate is restricted from detaching from the first side wall from the side facing the battery cell assembly, thereby increasing the connection reliability between the third side plate and the first side wall and improving the expansion resistance of the first side wall.

[0070] According to some embodiments of this application, the third side plate includes a plurality of third sub-side plates, which are distributed sequentially along a first direction, and adjacent third sub-side plates are connected to each other.

[0071] In the above scheme, when the size of the battery device in the first direction is large, the size of the third side plate in the first direction is also large, and the processing and manufacturing of the third side plate is more difficult. In this embodiment, by dividing the third side plate into multiple third sub-side plates, the processing and manufacturing difficulty can be reduced. At the same time, two adjacent third sub-side plates are connected to each other so that the third side plate has high overall strength, which facilitates the improvement of the structure composed of the first side wall, the third side plate and the beam structure for the resistance to expansion of the battery cell assembly, and further improves the constraint effect on the expansion deformation of the battery cell assembly.

[0072] According to some embodiments of this application, two adjacent third sub-side plates are mortise and tenon connected.

[0073] In the above scheme, the two adjacent third sub-side plates are connected by mortise and tenon joints, which further improves the overall strength of the third side plate, thereby improving the resistance of the first side wall and beam structure to the expansion of the battery cell assembly and improving the reliability of the battery device.

[0074] According to some embodiments of this application, the cover is connected to the first side wall, the second side wall, the first side plate and the second side plate, and the cover, the bottom wall, the first side wall, the second side wall, the first side plate and the second side plate form an accommodating space.

[0075] In the above scheme, the cover, bottom wall, first side wall, second side wall, first side plate and second side plate form an accommodating space. The first side plate and second side plate respectively constitute the side beams of the box. The size of the cover in the second direction can be designed to be smaller in order to save the material and manufacturing cost of the cover.

[0076] According to some embodiments of this application, the cover includes a top wall, a first flange portion and a second flange portion. The first flange portion and the second flange portion are respectively formed at both ends of the top wall in a third direction. Both the first flange portion and the second flange portion extend toward the bottom wall. The first flange portion is connected to the first side plate, the first side wall and the second side wall, and the second flange portion is connected to the second side plate, the first side wall and the second side wall.

[0077] In the above scheme, the first flange and the second flange are respectively formed at both ends of the top wall in the third direction. The cover structure is simple and easy to process and manufacture. The first flange is connected to the first side plate, the first side wall and the second side wall, and the second flange is connected to the second side plate, the first side wall and the second side wall, so that the cover and the box body can form an accommodating space and facilitate assembly.

[0078] According to some embodiments of this application, the bottom wall includes a first region, which is a solid region, and the mounting portion includes an internally threaded hole located in the first region, the internally threaded hole extending in a second direction and having an opening located on the outer surface of the bottom wall.

[0079] In the above scheme, the first region is a solid region with high overall strength, which facilitates the installation of the mounting part and improves the connection reliability between the battery device and the device body of the power-consuming device; the internal threaded hole extends along the second direction and the opening is located on the outer surface of the bottom wall, so that the locking member can extend into the internal threaded hole from the outer side of the bottom wall toward the inner side to lock the battery device to the device body of the power-consuming device.

[0080] According to some embodiments of this application, the bottom wall includes a first region, the first region is at least partially provided with a cavity structure, the mounting part includes an insert, the insert is provided with an internal threaded hole and is embedded in the cavity structure, and the outer surface of the bottom wall is provided with a third through hole, and the third through hole communicates with the internal threaded hole.

[0081] In the above scheme, the insert is provided with an internal threaded hole and is embedded in the cavity structure of the first region. This facilitates manufacturing, allows for flexible assembly, and improves the connection reliability between the battery device and the device body of the power-consuming device. Since the insert is embedded in the cavity structure and the third through hole communicates with the internal threaded hole, the insert does not protrude from the outer surface of the bottom wall, reducing its space occupation in the second direction and minimizing the risk of interference between the insert and other components. For example, when assembling the battery device and the device body of the power-consuming device, one end of the locking member can first pass through the third through hole and then extend into the internal threaded hole, facilitating the locking of the battery device and the device body of the power-consuming device from the outer side to the inner side of the bottom wall.

[0082] According to some embodiments of this application, along the second direction, the area of ​​the bottom wall corresponding to the first side wall and the beam structure is the first region.

[0083] In the above scheme, the first region corresponds to the first sidewall and beam structure. The first sidewall and beam structure are both hollow structures. The bottom wall located in the first region has a large bottom wall thickness so as to make use of the internal space of the first sidewall and beam structure and reduce the space occupied by the bottom wall on the side away from the battery cell assembly along the second direction.

[0084] According to some embodiments of this application, the cover includes a top wall, a third side wall, and a fourth side wall. The top wall and the bottom wall are arranged opposite each other along a second direction, and the third side wall and the fourth side wall are arranged opposite each other along a third direction. The top wall connects the third side wall and the fourth side wall. The first side wall, the beam structure, and the second side wall are located between the third side wall and the fourth side wall. The third side wall is connected to the first side wall, the second side wall, and the bottom wall. The fourth side wall is connected to the first side wall, the second side wall, and the bottom wall. The top wall, the third side wall, the fourth side wall, the bottom wall, the first side wall, and the second side wall form an accommodating space. The third direction, the second direction, and the first direction are perpendicular to each other.

[0085] In the above scheme, the cover and the box body can be U-shaped structures. The cover and the box body are fastened together to form an accommodating space, which can reduce the space occupied by the battery device in the third direction and facilitate the improvement of the energy density of the battery device.

[0086] According to some embodiments of this application, the box body is provided with a glue groove, and the glue groove is provided with sealant. The box body and the cover are sealed and bonded together by the sealant.

[0087] In the above solution, the glue groove can hold the sealant and serve to position the sealant; the box body and the cover are sealed and bonded by the sealant, which facilitates operation and can save on locking parts and reduce manufacturing costs.

[0088] According to some embodiments of this application, the first sidewall includes two first side surfaces disposed opposite each other along a third direction and a second side surface facing the cover along a second direction. A first transition surface is disposed between the first side surface and the second side surface, and the first transition surface smoothly transitions between the first side surface and the second side surface. The cover is connected to the first side surface, the second side surface and the first transition surface; and / or, the second sidewall includes two third side surfaces disposed opposite each other along a third direction and a fourth side surface facing the cover along a second direction. A second transition surface is disposed between the third side surface and the fourth side surface, and the second transition surface smoothly transitions between the third side surface and the fourth side surface. The cover is connected to the third side surface, the fourth side surface and the second transition surface.

[0089] In the above scheme, the first transition surface smoothly transitions between the first and second side surfaces, and the cover connects with the first side surface, the second side surface, and the first transition surface. This increases the connection area between the cover and the first side wall, resulting in higher connection reliability between the cover and the first side wall. Similarly, the second transition surface smoothly transitions between the third and fourth side surfaces, and the cover connects with the third side surface, the fourth side surface, and the second transition surface. This also increases the connection area between the cover and the second side wall, resulting in higher connection reliability between the cover and the second side wall.

[0090] According to some embodiments of this application, the cover includes a fourth connecting portion and a fifth connecting portion located at both ends along a first direction, the fourth connecting portion and the fifth connecting portion being used to connect a first sidewall and a second sidewall respectively; the fourth connecting portion includes two first inner sealing surfaces disposed opposite each other along a third direction, and a second inner sealing surface facing the bottom wall along a second direction, a first transition sealing surface being disposed between the first inner sealing surface and the second inner sealing surface, the first transition sealing surface smoothly transitioning between the first inner sealing surface and the second inner sealing surface, the first inner sealing surface being connected to a first side surface, the second inner sealing surface being connected to a second side surface, and the first transition sealing surface being connected to a first transition surface; the fifth connecting portion includes two third inner sealing surfaces disposed opposite each other along a third direction, and a fourth inner sealing surface facing the bottom wall along a second direction, a second transition sealing surface being disposed between the third inner sealing surface and the fourth inner sealing surface, the second transition sealing surface smoothly transitioning between the third inner sealing surface and the fourth inner sealing surface, the third inner sealing surface being connected to a third side surface, the fourth inner sealing surface being connected to a fourth side surface, and the second transition sealing surface being connected to a second transition surface.

[0091] In the above scheme, the first transition sealing surface smoothly transitions between the first inner sealing surface and the second inner sealing surface. The first transition sealing surface is correspondingly arranged with the first transition surface, and the contour of the cover matches the contour of the first sidewall, which facilitates improving the reliability of the sealing connection between the cover and the first sidewall. The second transition sealing surface smoothly transitions between the third inner sealing surface and the fourth inner sealing surface. The second transition sealing surface is correspondingly arranged with the second transition surface, and the contour of the cover matches the contour of the second sidewall, which facilitates improving the reliability of the sealing connection between the cover and the second sidewall.

[0092] According to some embodiments of this application, when a first transition surface is provided between the first side surface and the second side surface, the first side surface is provided with a first adhesive groove, the second side surface is provided with a second adhesive groove, and the first transition surface is provided with a third adhesive groove, the maximum depth of the third adhesive groove being greater than the maximum depth of at least one of the first and second adhesive grooves; and / or, when a second transition surface is provided between the third side surface and the fourth side surface, the third side surface is provided with a fourth adhesive groove, the fourth side surface is provided with a fifth adhesive groove, and the second transition surface is provided with a sixth adhesive groove, the maximum depth of the sixth adhesive groove being greater than the maximum depth of at least one of the fourth and fifth adhesive grooves.

[0093] In the above scheme, the maximum depth of the third glue groove is greater than the maximum depth of at least one of the first glue groove and the second glue groove, so that the third glue groove can hold more sealant, which facilitates improving the sealing connection reliability between the first transition surface and the first transition sealing surface; the maximum depth of the sixth glue groove is greater than the maximum depth of at least one of the fourth glue groove and the fifth glue groove, so that the sixth glue groove can hold more sealant, which facilitates improving the sealing connection reliability between the second transition surface and the second transition sealing surface.

[0094] According to some embodiments of this application, the battery device further includes a first fastener and a second fastener. The first fastener is used to connect the first sidewall and the cover, and the second fastener is used to connect the second sidewall and the cover. The first sidewall is provided with a first locking hole for locking the first fastener, and the second sidewall is provided with a second locking hole for locking the second fastener. The cover is provided with a fourth through hole corresponding to the first locking hole and a fifth through hole corresponding to the second locking hole. The first fastener passes through the fourth through hole and is locked with the first locking hole, and the second fastener passes through the fifth through hole and is locked with the second locking hole. At least one of the fourth through hole and the fifth through hole is a waist hole.

[0095] In the above scheme, at least one of the fourth and fifth through holes is a waist hole. When the first sidewall undergoes slight deformation due to the expansion force applied by the battery cell assembly, the fourth or fifth through hole on the cover can adapt to the locking position movement of the first or second fastener, which can reduce the probability of the cover cracking and make the cover and the first and second sidewalls have high sealing connection reliability.

[0096] According to some embodiments of this application, the bottom wall is provided with locking cavities at both ends along the third direction, the battery device further includes a third fastener, the third fastener is used to connect the cover to the bottom wall, and at least a portion of the third fastener is locked into the locking cavity, the bottom wall is provided with a flow channel cavity, the flow channel cavity and the locking cavity are separated, and the third direction is perpendicular to the first direction and the second direction.

[0097] In the above scheme, the locking cavity is convenient to accommodate the third fastener, so that the cover and the bottom wall can be locked together by the third fastener. The flow channel cavity is used to accommodate the heat exchange medium. The locking cavity and the flow channel cavity are separated, which can reduce the risk of heat exchange medium leakage.

[0098] According to some embodiments of this application, the second sidewall includes a frame and an inspection plate. The frame is connected to the bottom wall, and the frame is provided with an inspection window that extends through the frame along a first direction. The inspection plate is detachably connected to the frame and closes the inspection window.

[0099] In the above solution, the frame is equipped with an inspection window, and the inspection plate is detachably connected to the frame. When the cover is disassembled, only the inspection plate needs to be removed to inspect the internal components of the box, which can improve the inspection efficiency.

[0100] According to some embodiments of this application, the battery device further includes a lifting structure disposed on the side wall surface of the bottom wall along a third direction, wherein the third direction is perpendicular to the first direction and the second direction.

[0101] In the above scheme, by setting a hoisting structure on the side wall of the bottom wall along the third direction, the hoisting and transportation of the battery device can be facilitated, thus improving transportation convenience.

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

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

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

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

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

[0107] Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0108] Figure 4 A schematic projection of a portion of the structure of a battery device provided in some embodiments of this application on the same projection plane perpendicular to the second direction;

[0109] Figure 5 Cross-sectional views of a portion of the structure of a battery device provided in some embodiments of this application;

[0110] Figure 6 Cross-sectional views of the bottom wall provided for some embodiments of this application;

[0111] Figure 7 This is a schematic diagram of the structure of the box body provided in some other embodiments of this application;

[0112] Figure 8 A top view of a portion of the structure of a battery device provided in some embodiments of this application;

[0113] Figure 9 This is a schematic diagram of the structure of the box body provided in some embodiments of this application;

[0114] Figure 10 Cross-sectional views of the tensioning member provided in some embodiments of this application;

[0115] Figure 11 A schematic diagram illustrating the assembly of the first busbar component and the second groove according to some embodiments of this application;

[0116] Figure 12 An assembly diagram of the first busbar component and the first tensioning member provided for some embodiments of this application;

[0117] Figure 13 This is an exploded view of the structure of a battery device provided in other embodiments of this application;

[0118] Figure 14 This is an exploded view of the structure of the box body provided in some embodiments of this application;

[0119] Figure 15 This is a schematic diagram of the structure of the first region of the bottom wall provided in some embodiments of this application;

[0120] Figure 16 for Figure 5 A magnified view of part A;

[0121] Figure 17 for Figure 5 A magnified view of section B;

[0122] Figure 18 This is a schematic diagram of the assembly of the box body and the cover provided in some embodiments of this application;

[0123] Figure 19 This is a schematic diagram of the structure of the box body provided in some embodiments of this application;

[0124] Figure 20 A schematic diagram illustrating the assembly of the fourth connecting portion with the first sidewall, provided for some embodiments of this application;

[0125] Figure 21 A schematic diagram of the assembly of the fifth connecting part and the second sidewall provided for some embodiments of this application;

[0126] Figure 22A schematic diagram of the assembly of the cover with the first sidewall and the second sidewall provided for some embodiments of this application;

[0127] Figure 23 This is a schematic diagram illustrating the assembly of the cover and the bottom wall according to some embodiments of this application;

[0128] Figure 24 This is a schematic diagram of the structure of the second sidewall provided in some embodiments of this application;

[0129] Figure 25 This is an assembly diagram of the bottom wall and the hoisting structure provided for some embodiments of this application.

[0130] Icons: 100 - Battery assembly; 10 - Battery cell assembly; 10a - First battery cell assembly; 10b - Second battery cell assembly; 11 - Battery cell; 11a - Housing; 11b - Electrode terminals; 111 - First wall; 112 - Shoulder area; 112a - First shoulder area; 112b - Second shoulder area; 20 - Housing; 20a - Housing body; 21 - Bottom wall; 21a - Mounting part; 21b - Internal threaded hole; 21c - Outer surface; 21d - Third through hole; 211 - First sub-bottom wall; 211a - First internal threaded hole; 211b - First part; 211c - Second part; 212 - Second sub-bottom wall; 212a - Second internal threaded hole; 212b - Third part; 212c - Fourth Part; 212d - Fifth part; 212e - First groove; 213 - Third sub-bottom wall; 213a - Flow channel; 213b - Bottom wall body; 213c - Protrusion; 213d - Flow channel inlet; 213e - Flow channel outlet; 214 - First wall portion; 215 - Second wall portion; 22 - First side wall; 22a - First cavity; 22b - First partition wall; 22c - First opening; 22d - Second opening; 221 - First wall body; 222 - Second wall body; 223 - Third wall body; 224 - First surface; 225 - Second surface; 226 - Second groove; 227 - First through hole; 228 - Third groove; 2201 - First side surface; 2202 - Second side surface; 2203 - First transition surface; 22 0a-First glue groove; 220b-Second glue groove; 220c-Third glue groove; 220-First locking hole; 23-Second side wall; 231-Frame; 231a-Inspection window; 232-Inspection plate; 2301-Third side surface; 2302-Fourth side surface; 2303-Second transition surface; 230a-Fourth glue groove; 230b-Fifth glue groove; 230c-Sixth glue groove; 233-Fourth connecting part; 233a-First inner sealing surface; 233b-Second inner sealing surface; 233c-First transition sealing surface; 234-Fifth connecting part; 234a-Third inner sealing surface; 234b-Fourth inner sealing surface; 234c-Second transition sealing surface; 230-Second locking hole; 24-Beam structure; 24a- Second cavity; 24b-Second partition wall; 24c-Third opening; 24d-Fourth opening; 241-Fourth wall; 242-Fifth wall; 243-Sixth wall; 244-Second through hole; 20b-Cover; 20c-Accommodation space; 20d-Glue groove; 20e-Sealant; 20f-First sealing surface; 20g-Second sealing surface; 25-Top wall; 26-Third side wall; 27-Fourth side wall; 28-First flange; 29-Second flange; 31-First sealing plate; 32-Second sealing plate; 41-First connector; 42-Second connector; 43-First connecting pipe; 44-Second connecting pipe; 50-Tightening element; 50a-Base; 50b-Insulating element; 50c-Accommodation groove; 51-First tightening element;51a - First end; 60 - First busbar component; 61 - First connecting part; 62 - Second connecting part; 63 - Third connecting part; 71 - First side plate; 711 - First insert; 712 - Second insert; 713 - First sub-side plate; 72 - Second side plate; 721 - Third insert; 722 - Fourth insert; 723 - Second sub-side plate; 73 - Third side plate; 731 - Fifth insert; 732 - Third sub-side plate; 81 - Insulating component ; 82-Elastic component; 90-Insert; 101-First fastener; 102-Second fastener; 103-Third fastener; 104-Fourth through hole; 105-Fifth through hole; 110-Lifting structure; 200-Controller; 300-Motor; 1000-Vehicle; K-Cavity structure; M-Locking cavity; N-Flow channel cavity; P-Sealing area; Q-First area; X-First direction; Y-Third direction; Z-Second direction. Detailed Implementation

[0131] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0132] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0133] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0134] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0135] 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.

[0136] 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.

[0137] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0143] As an example, the enclosure may include a cover and a body. The cover and body snap together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing; it can be sealed or not sealed.

[0144] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing cover can be at least part of the vehicle's floor, or the housing body can be at least part of the vehicle's crossbeams and longitudinal beams.

[0145] 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.

[0146] The battery cell may be, but is not limited to, 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.

[0147] The development of battery device technology must take into account multiple design factors, such as reliability, discharge capacity, charge / discharge rate and other performance parameters. In addition, the energy density of the battery device also needs to be considered.

[0148] In some embodiments, the battery device includes a housing and a battery cell assembly. The housing includes a body and a cover, which enclose a receiving space for accommodating the battery cell assembly, which is disposed within the receiving space. The battery cell assembly includes a plurality of battery cells stacked along a first direction. During the design of the battery device, two expansion beams are arranged opposite each other along the first direction inside the side beams of the housing, and operating space for the battery cell assembly hoisting fixture is reserved between the expansion beams and the side beams. This results in low space utilization inside the housing in the first direction, leading to a low energy density of the battery device.

[0149] In view of this, in order to solve the problem of low utilization of internal space of the box, resulting in low energy density of the battery device, this application provides a battery device, which includes a battery cell assembly, a box body and a cover. The battery cell assembly includes multiple battery cells stacked along a first direction; the housing body includes a bottom wall, a first side wall, a second side wall, and a beam structure. The bottom wall supports the battery cell assembly along a second direction. The first side wall, the second side wall, and the beam structure are all connected to the side of the bottom wall facing the battery cell assembly. The first side wall, the beam structure, and the second side wall are arranged sequentially at intervals along the first direction. The battery cell assembly is located between the first side wall and the beam structure. The two ends of the battery cell assembly abut against the first side wall and the beam structure, respectively. The second direction is perpendicular to the first direction. The cover is connected to the first side wall and the second side wall. The cover and the housing body enclose a receiving space, and the battery cell assembly is placed in the receiving space. The cover and the housing body are sealed together to form an annular sealed area. The bottom wall is provided with a mounting part. On the same projection plane perpendicular to the second direction, the orthographic projections of all mounting parts are located within the space enclosed by the orthographic projections of the sealed area. The mounting part is used to connect to the device body of the electrical device.

[0150] In such a battery device, the battery cell assembly includes multiple battery cells stacked along a first direction to enable the battery device to have a high capacity. A housing and a cover constitute the housing of the battery device, enclosing a space for accommodating the battery cell assembly. The battery cell assembly is disposed within this space to protect it. The housing includes a bottom wall, a first side wall, a second side wall, and a beam structure. The bottom wall supports the battery cell assembly along a second direction to achieve assembly and positioning of the battery cell assembly. The first side wall, the beam structure, and the second side wall are arranged sequentially at intervals along the first direction, and the cover is connected to the first and second side walls to facilitate enclosure between the cover and the housing. The first and second side walls form the outermost side beams of the housing along the first direction. The first side wall functions as both a side beam and an expansion beam. By abutting the two ends of the battery cell assembly against the first side wall and the beam structure respectively, the first side wall and the beam structure work together to constrain the expansion and deformation of the battery cell assembly, thereby improving the reliability of the battery cell assembly. Furthermore, the first side wall saves space in the housing body in the first direction, resulting in a larger internal housing space in the first direction. This increases the proportion of the battery cell assembly's size within the housing along the first direction, improves the space utilization rate of the housing in the first direction, and thus increases the energy density of the battery device. Furthermore, the annular sealing area formed by the sealing connection between the cover and the box body isolates the containment space from the external environment, thereby reducing the risk of external liquids and dust entering the containment space. The mounting parts are set on the bottom wall, and on the same projection plane perpendicular to the second direction, the orthographic projections of all mounting parts are located within the space enclosed by the orthographic projection of the sealing area. On the one hand, this eliminates the need to set up mounting beams in the containment space, improving the space utilization rate inside the box. On the other hand, it utilizes the space in the second direction, eliminating the need to set up mounting beams around the box body, reducing the space occupied by the battery device in the plane perpendicular to the second direction, and facilitating the improvement of the energy density of the battery device.

[0151] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0152] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0153] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0154] 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.

[0155] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0156] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0157] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0158] Please refer to Figures 2 to 5 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application. Figure 4 This is a schematic projection of a portion of the structure of a battery device provided in some embodiments of this application on the same projection plane perpendicular to the second direction. Figure 5This is a cross-sectional view of a portion of the structure of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 100, which includes a battery cell assembly 10, a casing 20a, and a cover 20b. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X; the housing body 20a includes a bottom wall 21, a first side wall 22, a second side wall 23, and a beam structure 24. The bottom wall 21 supports the battery cell assembly 10 along a second direction Z. The first side wall 22, the second side wall 23, and the beam structure 24 are all connected to the side of the bottom wall 21 facing the battery cell assembly 10. The first side wall 22, the beam structure 24, and the second side wall 23 are arranged sequentially at intervals along the first direction X. The battery cell assembly 10 is located between the first side wall 22 and the beam structure 24. The two ends of the battery cell assembly 10 abut against the first side wall 22 and the beam structure 24, respectively. The second direction Z is perpendicular to the first direction X; the cover 20b is connected to the first side wall 22 and the second side wall 23. The cover 20b and the housing body 20a enclose a receiving space 20c, in which the battery cell assembly 10 is disposed. The cover 20b and the box body 20a are sealed together to form an annular sealing area P. The bottom wall 21 is provided with a mounting part 21a. On the same projection plane perpendicular to the second direction Z, the orthographic projections of all mounting parts 21a are located within the space enclosed by the orthographic projection of the sealing area P. The mounting part 21a is used to connect with the device body of the electrical device.

[0159] The cover 20b and the housing body 20a together define a receiving space 20c for accommodating the battery cell 11, such that the housing body 20a and the cover 20b together form the housing 20 of the battery device 100, and the housing 20 serves to provide the receiving space 20c for the battery cell assembly 10. Exemplarily, the housing 20 formed by the cover 20b and the housing body 20a is rectangular in shape.

[0160] In the battery device 100, there are multiple battery cells 11 disposed in the housing 20. The multiple battery cells 11 can be connected in series, in parallel or in a mixed manner. A mixed connection means that the multiple battery cells 11 are connected in both series and parallel.

[0161] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for connecting multiple battery cells 11 to achieve electrical connection between the multiple battery cells 11.

[0162] Each battery cell 11 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 11 can be in the shape of a cuboid, cylinder, prism, or other shapes. For example, the battery cell 11 is in the shape of a cuboid.

[0163] The bottom wall 21 supports the battery cell assembly 10 along the second direction Z. That is, the battery cell assembly 10 is disposed on the bottom wall 21 along the second direction Z, and the bottom wall 21 is located at the bottom of the battery cell assembly 10, so that the bottom wall 21 can provide support for the battery cell assembly 10. The thickness direction of the bottom wall 21 is parallel to the second direction Z. In some embodiments, the thickness direction of the bottom wall 21 may be parallel to the direction of gravity.

[0164] The cover 20b is connected to the first side wall 22 and the second side wall 23. The cover 20b and the box body 20a enclose the receiving space 20c. The first side wall 22 and the second side wall 23 are two opposite side beams of the box body 20 in the first direction X. That is, the first side wall 22 and the second side wall 23 are the two outermost components of the box body 20 in the first direction X.

[0165] Along the first direction X, the battery cell assembly 10 is located between the first sidewall 22 and the beam structure 24. The two ends of the battery cell assembly 10 abut against the first sidewall 22 and the beam structure 24 respectively. Both the first sidewall 22 and the beam structure 24 have the ability to resist the expansion and deformation of the battery cell assembly 10 and can limit the battery cell assembly 10 from expanding outward along the first direction X.

[0166] The cover 20b is sealed to the box body 20a, and the sealing interface of the two forms a continuous annular sealing area P, so that the gap between the cover 20b and the box body 20a is sealed, thereby isolating the containing space 20c from the external environment.

[0167] In some embodiments, the cover 20b and the box body 20a can be sealed together with sealant, or the cover 20b and the box body 20a can be sealed together with a gasket.

[0168] The mounting part 21a is a part for connecting to the device body (such as a vehicle frame) of the electrical device. In some embodiments, the mounting part 21a can be a threaded hole or a protrusion.

[0169] In some embodiments, with the second direction Z as the projection direction, the orthographic projection of the mounting part 21a is located within the space enclosed by the orthographic projection of the sealing region P, that is, the orthographic projection of the mounting part 21a does not exceed the space enclosed by the orthographic projection of the sealing region P.

[0170] In some embodiments, along the second direction Z, the mounting portion 21a may be spaced apart from the cover 20b to reduce the space occupied by the mounting portion 21a in the second direction Z.

[0171] According to an embodiment of this application, the battery device 100 includes a battery cell assembly 10 comprising a plurality of battery cells 11 stacked along a first direction X, thereby enabling the battery device 100 to have a high power capacity. A housing body 20a and a cover 20b constitute a housing 20, which encloses a receiving space 20c for accommodating the battery cell assembly 10. The battery cell assembly 10 is disposed within the receiving space 20c to protect it. The housing body 20a includes a bottom wall 21, a first side wall 22, a second side wall 23, and a beam structure 24. The bottom wall 21 supports the battery cell assembly 10 along a second direction Z to achieve assembly and positioning of the battery cell assembly 10. The first side wall 22, the beam structure 24, and the second side wall 23 are arranged sequentially at intervals along the first direction X, and the cover 20b is connected to the first side wall 22 and the second side wall 23 to facilitate assembly. The cover 20b and the box body 20a enclose the receiving space 20c. The first side wall 22 and the second side wall 23 are the outermost walls of the box body 20. The first side wall 22 has the functions of a side beam and an expansion beam. By abutting the two ends of the battery cell assembly 10 against the first side wall 22 and the beam structure 24 respectively, the first side wall 22 and the beam structure 24 cooperate to constrain the expansion and deformation of the battery cell assembly 10, which facilitates the improvement of the reliability of the battery cell assembly 10. In addition, the setting of the first side wall 22 can save the space of the box body 20a in the first direction X, so that the inside of the box body 20a has a larger receiving space 20c in the first direction X. This can increase the size ratio of the battery cell assembly 10 in the box body 20 along the first direction X, improve the space utilization rate inside the box body 20 in the first direction X, and thus improve the energy density of the battery device 100. Furthermore, the annular sealing area P formed by the sealed connection between the cover 20b and the box body 20a isolates the containing space 20c from the external environment, thereby reducing the risk of external liquids and dust entering the containing space 20c. The mounting part 21a is provided on the bottom wall 21. On the same projection plane perpendicular to the second direction Z, the orthographic projection of the mounting part 21a is located within the space enclosed by the orthographic projection of the sealing area P. On the one hand, it can eliminate the need to set up a mounting beam in the containing space 20c, thereby improving the space utilization rate inside the box body 20. On the other hand, it can utilize the space in the second direction Z, eliminating the need to set up a mounting beam on the periphery of the box body 20a, thereby reducing the space occupied by the battery device 100 in the plane perpendicular to the second direction Z, and facilitating the improvement of the energy density of the battery device 100.

[0172] Please refer to Figure 2 and Figure 4According to some embodiments of this application, the cover 20b includes a first sealing surface 20f and a second sealing surface 20g spaced apart along a third direction Y. Along the third direction Y, the box body 20a is located between the first sealing surface 20f and the second sealing surface 20g. The first sealing surface 20f is sealed to the box body 20a, and the second sealing surface 20g is sealed to the box body 20a. Both the first sealing surface 20f and the second sealing surface 20g intersect with the third direction Y. On the same projection plane perpendicular to the second direction Z, along the third direction Y, the orthographic projection of the mounting part 21a is located between the orthographic projection of the first sealing surface 20f and the orthographic projection of the second sealing surface 20g. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0173] The first sealing surface 20f and the second sealing surface 20g can be the surfaces of the cover 20b located on both sides of the battery cell assembly 10 in the third direction Y.

[0174] The first sealing surface 20f intersects with the third direction Y. For example, the angle between the first sealing surface 20f and the third direction Y can be 85° to 95°. Optionally, the angle between the first sealing surface 20f and the third direction Y can be 90°, that is, the first sealing surface 20f can be perpendicular to the third direction Y.

[0175] The second sealing surface 20g intersects with the third direction Y. For example, the angle between the second sealing surface 20g and the third direction Y can be 85° to 95°. Optionally, the angle between the second sealing surface 20g and the third direction Y can be 90°, that is, the second sealing surface 20g can be perpendicular to the third direction Y.

[0176] The structure formed by the sealing connection between the first sealing surface 20f and the second sealing surface 20g and the box body 20a forms part of the sealing area P.

[0177] With the second direction Z as the projection direction, on the same projection plane perpendicular to the second direction Z, the orthographic projection of the mounting part 21a is located between the first sealing surface 20f and the second sealing surface 20g along the third direction Y, so that the mounting part 21a does not extend beyond the bottom wall 21 along the third direction Y. There is no need to set a mounting structure on the side of the box body 20a in the third direction Y. The size of the battery device 100 in the third direction Y can be designed to be smaller, and the space utilization rate of the battery device 100 in the third direction Y is higher.

[0178] In the above scheme, the first sealing surface 20f is sealed to the box body 20a, and the second sealing surface 20g is sealed to the box body 20a. Both the first sealing surface 20f and the second sealing surface 20g intersect with the third direction Y, so that the cover 20b and the box body 20a are sealed to each other in the third direction Y. The cover 20b occupies less space in the third direction Y, so as to reduce the size of the battery device 100 in the third direction Y. Furthermore, on the same projection plane perpendicular to the second direction Z, along the third direction Y, the orthographic projection of the mounting part 21a is located between the orthographic projection of the first sealing surface 20f and the orthographic projection of the second sealing surface 20g. The mounting part 21a is set using the space of the box body 20a in the third direction Y. The mounting part 21a does not exceed the box body 20a in the third direction Y, so that the size of the battery device 100 in the third direction Y is smaller.

[0179] According to some embodiments of this application, at least one of the first sidewall 22 and the beam structure 24 is integrally formed with at least a portion of the bottom wall 21.

[0180] In some embodiments, the first sidewall 22 may be integrally formed with at least a portion of the bottom wall 21, and the beam structure 24 may be integrally formed with at least a portion of the bottom wall 21; or, the first sidewall 22 may be integrally formed with at least a portion of the bottom wall 21, and the beam structure 24 may also be integrally formed with at least a portion of the bottom wall 21. For example, the bottom wall 21 may be a one-piece structure, with the first sidewall 22 integrally formed with the bottom wall 21, and / or the beam structure 24 integrally formed with the bottom wall 21. As another example, the bottom wall 21 may include multiple parts that are separately configured and connected as one piece, with the first sidewall 22 integrally formed with one part of the bottom wall 21, and the beam structure 24 integrally formed with another part of the bottom wall 21.

[0181] In some embodiments, the first sidewall 22 may be integrally cast with the bottom wall 21, or the first sidewall 22 may be integrally extruded with the bottom wall 21. The beam structure 24 may be integrally cast with the bottom wall 21, or the first sidewall 22 may be integrally extruded with the bottom wall 21.

[0182] In the above scheme, at least a portion of the first sidewall 22 and the bottom wall 21 are integrally formed, so that the structure formed by the first sidewall 22 and the bottom wall 21 has high overall strength, thereby improving the constraint effect of the first sidewall 22 on the battery cell assembly 10. The part of the first sidewall 22 used to resist the expansion and deformation of the battery cell assembly 10 can be designed to be smaller in the first direction X, further reducing the space occupied by the first sidewall 22 in the first direction X and increasing the energy density of the battery device 100. At least a portion of the beam structure 24 and the bottom wall 21 are integrally formed, so that the structure formed by the beam structure 24 and the bottom wall 21 has high overall strength, thereby improving the constraint effect of the beam structure 24 on the battery cell assembly 10. The part of the beam structure 24 used to resist the expansion and deformation of the battery cell assembly 10 can be designed to be smaller in the first direction X, further reducing the space occupied by the beam structure 24 in the first direction X and increasing the energy density of the battery device 100.

[0183] Please refer to Figure 5 According to some embodiments of this application, the bottom wall 21 includes a first sub-bottom wall 211 and a second sub-bottom wall 212 that are connected to each other, a first side wall 22 is connected to the first sub-bottom wall 211, and a beam structure 24 is connected to the second sub-bottom wall 212; the first side wall 22 is integrally formed with the first sub-bottom wall 211, and / or the beam structure 24 is integrally formed with the second sub-bottom wall 212.

[0184] In some embodiments, the first sub-bottom wall 211 and the second sub-bottom wall 212 may be arranged along the first direction X, and the first sub-bottom wall 211 and the second sub-bottom wall 212 may be connected by other components.

[0185] The first sidewall 22 and the first sub-bottom wall 211 are integrally formed. For example, the first sidewall 22 and the first sub-bottom wall 211 can be integrally cast, or the first sidewall 22 and the first sub-bottom wall 211 can be integrally extruded.

[0186] The beam structure 24 and the second sub-bottom wall 212 are integrally formed. For example, the beam structure 24 and the second sub-bottom wall 212 can be integrally cast, or the beam structure 24 and the second sub-bottom wall 212 can be integrally extruded.

[0187] In the above scheme, the first sidewall 22 and the first sub-bottom wall 211 are integrally formed, so that the structure formed by the first sidewall 22 and the first sub-bottom wall 211 has high overall strength, so as to improve the constraint effect of the first sidewall 22 on the battery cell assembly 10. The part of the first sidewall 22 used to resist the expansion and deformation of the battery cell assembly 10 can be designed to be smaller in the first direction X, further reducing the space occupied by the first sidewall 22 in the first direction X and improving the energy density of the battery device 100; the beam structure 24 and the second sub-bottom wall 212 are integrally formed, so that the structure formed by the beam structure 24 and the second sub-bottom wall 212 has high overall strength, so as to improve the constraint effect of the beam structure 24 on the battery cell assembly 10. The part of the beam structure 24 used to resist the expansion and deformation of the battery cell assembly 10 can be designed to be smaller in the first direction X, further reducing the space occupied by the beam structure 24 in the first direction X and improving the energy density of the battery device 100.

[0188] According to some embodiments of this application, the first sidewall 22 and the first sub-bottom wall 211 are integrally extruded, and the beam structure 24 and the second sub-bottom wall 212 are integrally extruded.

[0189] The material of the first sidewall 22 and the first sub-bottom wall 211 can both be metal (such as alloy) so that the structure formed by the first sidewall 22 and the first sub-bottom wall 211 has high overall strength.

[0190] The materials of the beam structure 24 and the second sub-bottom wall 212 can both be metals (such as alloys) so that the structure formed by the beam structure 24 and the second sub-bottom wall 212 has high overall strength.

[0191] In the above scheme, the first sidewall 22 and the first sub-bottom wall 211 are integrally extruded, which is convenient for processing and manufacturing. The material distribution in the structure formed by the first sidewall 22 and the first sub-bottom wall 211 is uniform, and the overall strength is high. The beam structure 24 and the second sub-bottom wall 212 are integrally extruded, which is convenient for processing and manufacturing. The material distribution in the structure formed by the beam structure 24 and the second sub-bottom wall 212 is uniform, and the overall strength is high.

[0192] Please refer to Figure 5 According to some embodiments of this application, the bottom wall 21 further includes a third sub-bottom wall 213. The first sub-bottom wall 211, the third sub-bottom wall 213 and the second sub-bottom wall 212 are arranged sequentially along the first direction X. The third sub-bottom wall 213 connects the first sub-bottom wall 211 and the second sub-bottom wall 212.

[0193] The third sub-bottom wall 213 connects the first sub-bottom wall 211 and the second sub-bottom wall 212, and supports the battery cell assembly 10 along the second direction Z. On the same projection plane perpendicular to the second direction Z, the orthographic projection of the battery cell assembly 10 overlaps with the orthographic projection of the third sub-bottom wall 213.

[0194] In some embodiments, the first direction X may be parallel to the length direction of the battery device 100, and the second direction Z may be parallel to the height direction of the battery device 100.

[0195] In the above scheme, the first sub-bottom wall 211, the third sub-bottom wall 213 and the second sub-bottom wall 212 are arranged sequentially along the first direction X, and the third sub-bottom wall 213 connects the first sub-bottom wall 211 and the second sub-bottom wall 212, which facilitates processing and manufacturing.

[0196] Please refer to Figure 6 , Figure 6 This is a cross-sectional view of the bottom wall provided in some embodiments of this application. According to some embodiments of this application, a flow channel 213a is formed inside the third sub-bottom wall 213 for accommodating the heat exchange medium.

[0197] The third sub-bottom wall 213 supports the battery cell assembly 10 along the second direction Z, and the third sub-bottom wall 213 corresponds to the battery cell assembly 10.

[0198] The third sub-bottom wall 213 can be integrally extruded to form a flow channel 213a inside the third sub-bottom wall 213.

[0199] The third sub-bottom wall 213 can have good thermal conductivity to facilitate heat exchange between the heat exchange medium and the battery cell assembly 10. For example, when the heat exchange medium is a cooling medium, the low temperature of the cooling medium is transferred to the battery cell assembly 10 through the third sub-bottom wall 213, which can reduce the temperature of the battery cell assembly 10. Alternatively, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the battery cell assembly 10 through the third sub-bottom wall 213, which can increase the temperature of the battery cell assembly 10.

[0200] After the battery device 100 is assembled, the flow channel 213a contains a heat exchange medium to exchange heat with the battery cell assembly 10.

[0201] The heat exchange medium in the flow channel 213a of the third sub-bottom wall 213 can be a fluid, and the heat exchange medium can be, but is not limited to, water, alcohol or other liquid mixtures.

[0202] In the above scheme, along the second direction Z, the third sub-bottom wall 213 and the battery cell assembly 10 have a large overlap area. By accommodating the heat exchange medium in the flow channel 213a of the third sub-bottom wall 213, the thermal management component is integrated with the third sub-bottom wall 213. On the one hand, heat exchange can be carried out between the heat exchange medium and the battery cell assembly 10 to regulate the temperature of the battery cell assembly 10, which is conducive to improving the reliability of the battery cell assembly 10. On the other hand, the space utilization rate inside the housing 20 in the second direction Z can be improved, which is conducive to improving the energy density of the battery device 100.

[0203] Please refer to Figure 6 and further refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of the box body provided in some other embodiments of this application. According to some embodiments of this application, the third sub-bottom wall 213 includes a bottom wall body 213b and a protrusion 213c. The protrusion 213c protrudes from the bottom wall body 213b on the side near the second sub-bottom wall 212. A first groove 212e is provided on the side of the second sub-bottom wall 212 near the third sub-bottom wall 213, and at least a portion of the protrusion 213c is disposed in the first groove 212e.

[0204] The bottom wall body 213b is the third sub-bottom wall 213 used to support the battery cell assembly 10, and most of the flow channel 213a is located in the bottom wall body 213b.

[0205] The protrusion 213c and the bottom wall body 213b are arranged along the first direction X, and the protrusion 213c is used to connect with the second sub-bottom wall 212.

[0206] The first groove 212e is a structure that matches the contour of the protrusion 213c. At least a portion of the protrusion 213c is disposed in the first groove 212e so that there is a large connection area between the third sub-bottom wall 213 and the second sub-bottom wall 212.

[0207] In the above scheme, the bottom wall body 213b is used to support the battery cell assembly 10, and most of the area of ​​the flow channel 213a is located in the bottom wall body 213b to facilitate heat exchange with the battery cell assembly 10; the protrusion 213c protrudes from the bottom wall body 213b on the side near the second sub-bottom wall 212 so that the protrusion 213c can cooperate with the first groove 212e, so that the third sub-bottom wall 213 and the second sub-bottom wall 212 have a large connection area, which facilitates the improvement of the connection reliability between the third sub-bottom wall 213 and the second sub-bottom wall 212.

[0208] Please refer to Figure 6According to some embodiments of this application, the protrusion 213c is provided with a flow channel inlet 213d and a flow channel outlet 213e. The flow channel inlet 213d is connected to the flow channel 213a, and the flow channel outlet 213e is connected to the flow channel 213a. On the same projection plane perpendicular to the second direction Z, along the first direction X, the orthographic projection of the flow channel inlet 213d and the orthographic projection of the flow channel outlet 213e are located between the orthographic projection of the beam structure 24 and the orthographic projection of the second sidewall 23.

[0209] The inlet 213d connects the inside and outside of the flow channel 213a and is used to input the heat exchange medium into the flow channel 213a; the outlet 213e connects the inside and outside of the flow channel 213a and is used to transport the heat exchange medium in the flow channel 213a to the outside of the flow channel 213a.

[0210] In the above scheme, the orthographic projection of the flow channel inlet 213d and the orthographic projection of the flow channel outlet 213e are located between the orthographic projection of the beam structure 24 and the orthographic projection of the second side wall 23. The space between the beam structure 24 and the second side wall 23 is used to facilitate the connection of the flow channel inlet 213d and the flow channel outlet 213e to the connecting pipe, which is convenient for assembly and disassembly. In addition, it can reduce the risk of interference between the connecting pipe and the battery cell assembly 10.

[0211] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, there are two protrusions 213c, which are spaced apart along the third direction Y. The flow channel inlet 213d is disposed on one protrusion 213c, and the flow channel outlet 213e is disposed on the other protrusion 213c. There are two first grooves 212e, which are spaced apart along the third direction Y. One protrusion 213c is disposed in one first groove 212e. The third direction Y, the second direction Z, and the first direction X are perpendicular to each other.

[0212] In some embodiments, the third-party direction Y can be parallel to the width direction of the battery device 100.

[0213] The two protrusions 213c are spaced apart along the third direction Y. For example, the two protrusions 213c can be set at opposite ends of the bottom wall body 213b along the third direction Y, so that the two protrusions 213c have a large distance between them in the third direction Y.

[0214] Two first grooves 212e correspond one-to-one with two protrusions 213c, and each protrusion 213c is disposed in one first groove 212e.

[0215] In the above scheme, the flow channel inlet 213d and the flow channel outlet 213e are respectively set on the two protrusions 213c, which reduces the amount of heat conduction between the heat exchange medium at the flow channel inlet 213d and the flow channel outlet 213e due to their close proximity, and facilitates heat exchange between the heat exchange medium and the battery cell assembly 10. At the same time, the cooperation between the two protrusions 213c and the two first grooves 212e can increase the connection area between the third sub-bottom wall 213 and the second sub-bottom wall 212, which can improve the connection reliability between the third sub-bottom wall 213 and the second sub-bottom wall 212.

[0216] Please refer to Figures 2 to 6 and further refer to Figure 8 , Figure 8 This is a top view of a portion of the structure of a battery device provided in some embodiments of this application. According to some embodiments of this application, the battery device 100 further includes a first connector 41 and a second connector 42, which are respectively disposed on the second sidewall 23; the battery device 100 also includes a first connecting pipe 43 and a second connecting pipe 44, which are both disposed between the beam structure 24 and the second sidewall 23. The first connecting pipe 43 connects the flow channel inlet 213d and the first connector 41, and the second connecting pipe 44 connects the flow channel outlet 213e and the second connector 42.

[0217] Both the first connector 41 and the second connector 42 are pipe connectors. One end of the first connector 41 is used to connect to the first connecting pipe 43, and the other end of the first connector 41 is used to connect to an external pipe. One end of the second connector 42 is used to connect to the second connecting pipe 44, and the other end of the second connector 42 is used to connect to an external pipe.

[0218] The first connector 41 is disposed on the second side wall 23, and the two ends of the first connector 41 are respectively located on opposite sides of the second side wall 23 along the first direction X, so as to facilitate the connection of the first connector 41 with the first connecting pipe 43 and the external pipe.

[0219] The second connector 42 is disposed on the second side wall 23, and the two ends of the second connector 42 are respectively located on opposite sides of the second side wall 23 along the first direction X, so as to facilitate the connection of the second connector 42 with the second connecting pipe 44 and the external pipe.

[0220] The first connecting pipe 43 is a connecting pipe used to connect the flow channel inlet 213d and the first connector 41, and the second connecting pipe 44 is a connecting pipe used to connect the flow channel outlet 213e and the second connector 42.

[0221] In some embodiments, along the second direction Z, the flow channel inlet 213d is disposed on the side of the protrusion 213c facing the cover 20b, and the flow channel outlet 213e is disposed on the side of the protrusion 213c facing the cover 20b; for ease of assembly, both the first connecting pipe 43 and the second connecting pipe 44 can be bent structures.

[0222] In the above scheme, the first connector 41 and the second connector 42 are respectively disposed on the second side wall 23 to facilitate connection with external pipes; the first connecting pipe 43 and the second connecting pipe 44 are both disposed between the beam structure 24 and the second side wall 23, and the first connecting pipe 43 connects the flow channel inlet 213d and the first connector 41, and the second connecting pipe 44 connects the flow channel outlet 213e and the second connector 42 to facilitate the connection between the flow channel 213a in the third sub-side wall and the external pipes, which facilitates the input and output of the heat exchange medium.

[0223] According to some embodiments of this application, the first sub-bottom wall 211 is welded to the third sub-bottom wall 213, and the second sub-bottom wall 212 is welded to the third sub-bottom wall 213.

[0224] The material of the third sub-bottom wall 213 and the first sub-bottom wall 211 can both be metal, and the third sub-bottom wall 213 and the first sub-bottom wall 211 are connected together by welding.

[0225] The material of the third sub-bottom wall 213 and the second sub-bottom wall 212 can both be metal, and the third sub-bottom wall 213 and the second sub-bottom wall 212 are connected together by welding.

[0226] In the above scheme, the first sub-bottom wall 211 and the third sub-bottom wall 213 are welded together, so that the connection between the first sub-bottom wall 211 and the third sub-bottom wall 213 is firm and the connection reliability between the first sub-bottom wall 211 and the third sub-bottom wall 213 is improved; the second sub-bottom wall 212 and the third sub-bottom wall 213 are welded together, so that the connection between the second sub-bottom wall 212 and the third sub-bottom wall 213 is firm and the connection reliability between the second sub-bottom wall 212 and the third sub-bottom wall 213 is improved.

[0227] According to some embodiments of this application, the first sub-bottom wall 211 and the third sub-bottom wall 213 are connected by friction stir welding, and the second sub-bottom wall 212 and the third sub-bottom wall 213 are connected by friction stir welding.

[0228] Friction stir welding refers to the use of heat generated by the friction between a high-speed rotating welding tool and the workpiece to locally melt the materials to be welded. As the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding tool under the action of the rotational friction force of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool.

[0229] In the above scheme, by connecting the first sub-bottom wall 211 and the third sub-bottom wall 213 through friction stir welding, the welding strength can be enhanced, resulting in a structure with higher strength after welding, and further improving the connection reliability between the first sub-bottom wall 211 and the third sub-bottom wall 213. Similarly, by connecting the second sub-bottom wall 212 and the third sub-bottom wall 213 through friction stir welding, the welding strength can be enhanced, resulting in a structure with higher strength after welding, and further improving the connection reliability between the second sub-bottom wall 212 and the third sub-bottom wall 213.

[0230] Please refer to Figure 5 According to some embodiments of this application, the second sidewall 23 is connected to the second sub-bottom wall 212.

[0231] In some embodiments, along the second direction Z, the second sidewall 23 is located on the side of the second sub-bottom wall 212 facing the cover 20b.

[0232] Along the first direction X, the second sidewall 23 is located at the end of the second sub-bottom wall 212 away from the first sub-bottom wall 211, so that the distance between the second sidewall 23 and the beam structure 24 along the first direction X is large, which facilitates the installation of components such as high voltage boxes and battery connection systems between the second sidewall 23 and the beam structure 24.

[0233] The second side wall 23 and the second sub-bottom wall 212 are two independent components, which facilitates processing and manufacturing and reduces manufacturing difficulty.

[0234] In some embodiments, the second sidewall 23 is welded to the second sub-bottom wall 212 so that there is a high connection strength between the second sidewall 23 and the second sub-bottom wall 212.

[0235] In the above scheme, the connection between the second side wall 23 and the second sub-bottom wall 212 facilitates the second side wall 23 and the bottom wall 21 to form a receiving space 20c for accommodating the battery cell assembly 10.

[0236] Please refer to Figure 5 According to some embodiments of this application, the battery device 100 further includes a third direction Y, which is perpendicular to the first direction X and the second direction Z; the first sidewall 22 and the first sub-bottom wall 211 are integrally extruded along the third direction Y, and the interior of the first sidewall 22 forms a first cavity 22a extending along the third direction Y and penetrating both ends; and / or, the beam structure 24 and the second sub-bottom wall 212 are integrally extruded along the third direction Y, and the interior of the beam structure 24 forms a second cavity 24a extending along the third direction Y and penetrating both ends.

[0237] The first sidewall 22 has an internally hollow structure so that it can absorb part of the expansion force of the battery cell assembly 10.

[0238] The beam structure 24 is hollow inside, so that the beam structure 24 can absorb part of the expansion force of the battery cell assembly 10.

[0239] The first cavity 22a extends through the first sidewall 22 in the third direction Y. The first sidewall 22 and the first sub-bottom wall 211 are manufactured by integral extrusion molding, which facilitates processing and manufacturing.

[0240] The second cavity 24a extends through the beam structure 24 in the third direction Y. The beam structure 24 and the second sub-bottom wall 212 are manufactured by integral extrusion molding, which facilitates processing and manufacturing.

[0241] In the above scheme, the first cavity 22a penetrates the first sidewall 22 along the third direction Y. The first cavity 22a has a large volume. On the one hand, the first sidewall 22 has a lighter weight, which facilitates the reduction of the overall weight of the battery device 100. On the other hand, the first sidewall 22 facilitates the absorption of the expansion force of the battery cell assembly 10. The second cavity 24a penetrates the beam structure 24 along the third direction Y. The second cavity 24a has a large volume. On the one hand, the beam structure 24 has a lighter weight, which facilitates the reduction of the overall weight of the battery device 100. On the other hand, the beam structure 24 facilitates the absorption of the expansion force of the battery cell assembly 10.

[0242] In some embodiments, the first cavity 22a inside the first sidewall 22 is divided into a plurality of first sub-cavities by a first partition wall 22b. The plurality of first sub-cavities are arranged along the second direction Z, and two adjacent first sub-cavities are separated by the first partition wall 22b. The first partition wall 22b can be regarded as a reinforcing rib disposed inside the first sidewall 22 to give the first sidewall 22 high overall strength.

[0243] In some embodiments, please refer to Figure 5 The second cavity 24a inside the beam structure 24 is divided into multiple second sub-cavities by the second partition wall 24b. The multiple second sub-cavities are arranged along the second direction Z, and two adjacent second sub-cavities are separated by the second partition wall 24b. The second partition wall 24b can be regarded as a stiffener set inside the beam structure 24 to give the beam structure 24 a high overall strength.

[0244] Please refer to Figure 9 , Figure 9This is a schematic diagram of the structure of the box body provided in some embodiments of this application. According to some embodiments of this application, the first cavity 22a extends along a third direction Y so that the first sidewall 22 forms a first opening 22c and a second opening 22d at its two ends in the third direction Y, respectively; the box body 20a also includes a first sealing plate 31 and a second sealing plate 32, the first sealing plate 31 is connected to the first sidewall 22 and closes the first opening 22c, the second sealing plate 32 is connected to the first sidewall 22 and closes the second opening 22d, and the cover 20b is at least partially used for sealing cooperation with the first sealing plate 31 and the second sealing plate 32.

[0245] After the first cavity 22a penetrates the first sidewall 22 along the third direction Y, a first opening 22c and a second opening 22d are formed at both ends of the first sidewall 22 along the third direction Y, and the first cavity 22a communicates with the outside through the first opening 22c and the second opening 22d.

[0246] The first sealing plate 31 is a plate-shaped structure used to close the first opening 22c. The first sealing plate 31 blocks the first opening 22c and is connected to the first side wall 22, so that the first cavity 22a cannot communicate with the outside through the first opening 22c.

[0247] The second sealing plate 32 is a plate-shaped structure used to close the second opening 22d. The second sealing plate 32 blocks the second opening 22d and is connected to the first side wall 22, so that the first cavity 22a cannot communicate with the outside through the second opening 22d.

[0248] In some embodiments, the first sidewall 22 is made of metal, and the first sealing plate 31 is also made of metal. The first sealing plate 31 is welded to the first sidewall 22 to ensure a firm connection between them. The first sidewall 22 is made of metal, and the second sealing plate 32 is also made of metal. The second sealing plate 32 is welded to the first sidewall 22 to ensure a firm connection between them.

[0249] Since the first opening 22c and the second opening 22d connect to the first cavity 22a, if the first opening 22c and the second opening 22d are exposed, it will be detrimental to the connection between the cover 20b and the first side wall 22, resulting in a smaller connection area between the cover 20b and the first side wall 22, and making it more difficult to achieve a sealed fit between the cover 20b and the first side wall 22. By closing the first opening 22c with the first sealing plate 31 and the second opening 22d with the second sealing plate 32, the connection area between the cover 20b and the box body 20a can be increased, and it is easier to achieve a sealed fit between the cover 20b and the box body 20a.

[0250] In the above scheme, the first sealing plate 31 closes the first opening 22c and is connected to the first side wall 22. When the box body 20a is connected to the cover 20b, the first sealing plate 31 can be used to connect the box body 20a and the cover 20b, so that there is a large connection area between the box body 20a and the cover 20b, which facilitates the improvement of the connection reliability and sealing performance between the box body 20a and the cover 20b. The second sealing plate 32 closes the second opening 22d and is connected to the first side wall 22. When the box body 20a is connected to the cover 20b, the second sealing plate 32 can be used to connect the box body 20a and the cover 20b, so that there is a large connection area between the box body 20a and the cover 20b, which facilitates the improvement of the connection reliability and sealing performance between the box body 20a and the cover 20b.

[0251] Please refer to Figure 2 , Figure 3 and Figure 9 According to some embodiments of this application, the cover 20b includes a top wall 25, a third side wall 26, and a fourth side wall 27. The top wall 25 and the bottom wall 21 are disposed opposite each other along the second direction Z, and the third side wall 26 and the fourth side wall 27 are disposed opposite each other along the third direction Y. The top wall 25 connects the third side wall 26 and the fourth side wall 27. The third side wall 26 is located on the side of the first sealing plate 31 opposite to the second sealing plate 32, and the third side wall 26 is connected to the first sealing plate 31. The fourth side wall 27 is located on the side of the second sealing plate 32 opposite to the first sealing plate 31, and the fourth side wall 27 is connected to the second sealing plate 32.

[0252] The top wall 25 and the bottom wall 21 are arranged opposite each other along the second direction Z, and the battery cell assembly 10 is disposed between the top wall 25 and the bottom wall 21.

[0253] The third sidewall 26 and the fourth sidewall 27 are disposed opposite each other along the third direction Y, and the top wall 25 connects the third sidewall 26 and the fourth sidewall 27, so that the cover 20b is formed into a U-shaped structure. In some embodiments, the third sidewall 26, the top wall 25 and the fourth sidewall 27 can be integrally formed, for example, the third sidewall 26, the top wall 25 and the fourth sidewall 27 can be injection molded, or the third sidewall 26, the top wall 25 and the fourth sidewall 27 can be stamped.

[0254] Along the third direction Y, the box body 20a is located between the third side wall 26 and the fourth side wall 27. The third side wall 26 is located on the side of the first sealing plate 31 facing away from the second sealing plate 32, and the fourth side wall 27 is located on the side of the second sealing plate 32 facing away from the first sealing plate 31. The surface of the third side wall 26 facing the fourth side wall 27 is connected to the surface of the first sealing plate 31 facing away from the second sealing plate 32, and the surface of the fourth side wall 27 facing the third side wall 26 is connected to the surface of the second sealing plate 32 facing away from the first sealing plate 31.

[0255] In the above scheme, the third sidewall 26 is located on the side of the first sealing plate 31 opposite to the second sealing plate 32, and the third sidewall 26 is connected to the side of the first sealing plate 31 opposite to the second sealing plate 32. The fourth sidewall 27 is located on the side of the second sealing plate 32 opposite to the first sealing plate 31, and the fourth sidewall 27 is connected to the side of the second sealing plate 32 opposite to the first sealing plate 31. This makes the space occupied by the sealing interface between the cover 20b and the box body 20a in the third direction Y smaller, so as to improve the space utilization rate of the box body 20 in the third direction Y, and facilitate the improvement of the energy density of the battery device 100.

[0256] Please refer to Figure 8 According to some embodiments of this application, the box body 20a also includes a tensioning member 50, the two ends of which are respectively connected to the first side wall 22 and the beam structure 24.

[0257] The tensioning member 50 is a component used to connect the first sidewall 22 and the beam structure 24, and the tensioning member 50 is used to tension the first sidewall 22 and the beam structure 24.

[0258] In some embodiments, the tensioning member 50 may be made of metal, such as steel or other alloys, to give the tensioning member 50 high tensile strength.

[0259] The length direction of the tensioning member 50 can be parallel to the first direction X. One end of the tensioning member 50 can be connected to the first side wall 22 by bolts, and the other end of the tensioning member 50 can be connected to the beam structure 24 by bolts, which facilitates assembly and disassembly.

[0260] In some embodiments, the tensioner 50 may be in the form of a strip, for example, the tensioner 50 may be a steel strip, and the size of the tensioner 50 in the third direction Y may be designed to be small in order to reduce the risk of interference with other components.

[0261] In some embodiments, the tensioner 50 may be plate-shaped, for example, the tensioner 50 may be a steel plate.

[0262] In some embodiments, the tensioner 50 may be connected to the side of the battery cell 11 opposite to the bottom wall 21.

[0263] In some embodiments, when the tensioning member 50 is made of metal, an insulating layer is provided on the surface of the tensioning member 50 and / or the surface of the battery cell 11 to insulatingly separate the tensioning member 50 and the battery cell 11, thereby reducing the risk of short circuit between the tensioning member 50 and the battery cell 11.

[0264] In the above scheme, the two ends of the tensioning member 50 are connected to the first side wall 22 and the beam structure 24 respectively, so as to constrain the expansion deformation of the battery cell assembly 10 through the first side wall 22 and the beam structure 24, thereby improving the reliability of the battery cell assembly 10.

[0265] According to some embodiments of this application, along the second direction Z, the tensioner 50 is located on the side of the battery cell assembly 10 opposite to the bottom wall 21.

[0266] In the above scheme, the two ends of the tensioning member 50 are respectively connected to the first side wall 22 and the beam structure 24, and the tensioning member 50 is located on the side of the battery cell assembly 10 away from the bottom wall 21 along the second direction Z. The tensioning member 50 can tighten the first side wall 22 and the beam structure 24 to constrain the expansion force of the battery cell assembly 10 along the first direction X, assist the first side wall 22 and the beam structure 24 in resisting the deformation of the battery cell 11, reduce the risk of damage to the first side wall 22 and the beam structure 24 due to the expansion of the battery cell 11, and facilitate the improvement of the reliability of the battery cell assembly 10.

[0267] Please refer to Figure 8 and Figure 9 According to some embodiments of this application, the first sidewall 22 is provided with a first surface 224 and a second surface 225 at the end opposite to the bottom wall 21. The first surface 224 is recessed relative to the second surface 225 in a direction closer to the bottom wall 21. Along the first direction X, the first surface 224 is closer to the battery cell assembly 10 relative to the second surface 225. The tensioning member 50 is connected to the first surface 224, and the cover 20b is sealed to the second surface 225.

[0268] The first surface 224 and the second surface 225 are located on the side of the first sidewall 22 away from the bottom wall 21. The first surface 224 is recessed relative to the second surface 225 in the direction closer to the bottom wall 21, so that the first surface 224 and the second surface 225 form a step.

[0269] The first surface 224 is closer to the bottom wall 21 than the second surface 225. When the cover 20b is connected to the box body 20a, the top wall 25 of the cover 20b is connected to the second surface 225, and the tensioning member 50 is connected to the first surface 224, which can reduce the risk of interference between the tensioning member 50 and the top wall 25.

[0270] The sealing connection between the cover 20b and the second surface 225 can be achieved by providing a sealing gasket between the cover 20b and the second surface 225, connecting the cover 20b and the second surface 225 through a locking member, and forming a sealing interface between the cover 20b and the second surface 225 through the sealing gasket; or, a sealant can be provided between the cover 20b and the second surface 225, and the cover 20b and the second surface 225 can be sealed together by the sealant.

[0271] In the above scheme, the first surface 224 and the second surface 225 are both located at the end of the first sidewall 22 away from the bottom wall 21, and the first surface 224 is recessed relative to the second surface 225 in the direction closer to the bottom wall 21. The tensioning member 50 is connected to the first surface 224, and the cover 20b is sealed to the second surface 225. This can reduce the risk of interference between the tensioning member 50 and the cover 20b. At the same time, it allows the size of the battery device 100 in the second direction Z to be designed to be smaller, which is conducive to improving the energy density of the battery device 100.

[0272] Please refer to Figure 8 According to some embodiments of this application, the battery cell 11 includes a housing 11a and two electrode terminals 11b. The housing 11a includes a first wall 111. The two electrode terminals 11b are spaced apart on the first wall 111 along a third direction Y. The first wall 111 includes a shoulder region 112 located outside the two electrode terminals 11b along a third direction Y. A tensioning member 50 is disposed on the shoulder region 112. The third direction Y, the second direction Z, and the first direction X are perpendicular to each other.

[0273] The two electrode terminals 11b have opposite polarities and are spaced apart along the third direction Y.

[0274] The first wall 111 is the wall portion of the outer casing 11a that is away from the bottom wall 21, and the first wall 111 is used to connect with the tensioner 50.

[0275] The shoulder region 112 is the area of ​​the bottom wall 21 located outside the two electrode terminals 11b along the third direction Y. For example, the first wall 111 has a first edge and a second edge that are disposed opposite each other along the third direction Y. The two electrode terminals 11b are a first terminal and a second terminal, respectively. The first terminal is disposed close to the first edge relative to the second terminal. Along the third direction Y, the area between the first terminal and the first edge, and the area between the second terminal and the second edge are both shoulder regions 112.

[0276] "The tensioning member 50 is provided in the shoulder area 112" means that the tensioning member 50 is provided correspondingly to the shoulder area 112, the tensioning member 50 can be connected to the shoulder area 112, or, along the second direction Z, the tensioning member 50 can be provided at intervals from the shoulder area 112.

[0277] For example, the tensioning member 50 is located on the side of the battery cell 11 away from the bottom wall 21. On the same projection plane perpendicular to the second direction Z, the orthographic projection of the tensioning member 50 partially overlaps with the orthographic projection of the shoulder region 112. That is, along the second direction Z, the tensioning member 50 partially overlaps with the shoulder region 112.

[0278] In the above scheme, two electrode terminals 11b are spaced apart along the third direction Y on the first wall 111 so as to connect to external conductive components (such as busbar components) through the two electrode terminals 11b; along the third direction Y, the area between the two electrode terminals 11b on the first wall 111 can be provided with structures such as injection holes and pressure relief mechanisms, and the tensioning member 50 is provided in the shoulder area 112, which can reduce the risk of interference between the tensioning member 50 and other structures (such as injection holes and pressure relief mechanisms) on the first wall 111.

[0279] According to some embodiments of this application, the tensioner 50 is connected to the shoulder region 112.

[0280] For example, the tensioner 50 can be bonded to the shoulder area 112, or the tensioner 50 can be directly connected to the shoulder area 112.

[0281] In the above scheme, the tensioning member 50 is connected to the shoulder area 112. On the one hand, the previous transmission path—expansion of battery cell 11—displacement tendency of first sidewall 22 and beam structure 24—tensioning by tensioning member 50—is transformed into a force transmission path other than the above-mentioned force transmission path. When battery cell 11 expands, tensioning member 50 transmits the force that restricts the expansion of battery cell 11 through the connection with battery cell 11, further reducing the risk of damage to first sidewall 22 and beam structure 24 due to expansion of battery cell 11. On the other hand, it can restrict the movement of battery cell 11 in the direction away from bottom wall 21, making it easier to resist the impact on battery device 100 and improve the reliability of battery device 100.

[0282] Please refer to Figure 10 , Figure 10 This is a cross-sectional view of a tensioning member provided in some embodiments of this application. According to some embodiments of this application, the tensioning member 50 includes a base 50a and an insulating member 50b. The base 50a is a metal part, and the insulating member 50b has a receiving groove 50c. At least a portion of the base 50a is received in the receiving groove 50c. The insulating member 50b is located between the base 50a and the battery cell 11, and the insulating member 50b is bonded to the shoulder region 112.

[0283] For example, the material of the matrix 50a can include steel, aluminum alloy, etc., and has a certain strength.

[0284] For example, the insulating component 50b can be made of plastic or rubber.

[0285] In some embodiments, please refer to Figure 10 The cross-section of the insulating member 50b formed by the plane of the second direction Z and the third direction Y can be U-shaped, that is, the opening of the receiving groove 50c is located on the side of the insulating member 50b away from the battery cell 11.

[0286] For example, the insulating member 50b has a recessed groove 50c on the side opposite to the battery cell 11 to facilitate the assembly of the insulating member 50b with the substrate 50a.

[0287] In other embodiments, the insulating element 50b may also be annular, and the insulating element 50b may be sleeved on the outside of the base 50a.

[0288] In the above scheme, the substrate 50a is a metal part, which facilitates the improvement of the overall strength of the tensioning member 50 and the connection reliability between the tensioning member 50 and the first sidewall 22; at least a portion of the substrate 50a is accommodated in the receiving groove 50c, and the insulating member 50b is located between the substrate 50a and the battery cell 11, which facilitates the insulation and isolation between the substrate 50a and the battery cell 11 and reduces the risk of short circuit between the positive and negative electrodes; the insulating member 50b is bonded to the shoulder area 112, which can improve the connection stability between the insulating member 50b and the battery cell 11.

[0289] Please refer to Figure 8 According to some embodiments of this application, the battery cell assembly 10 includes a first battery cell assembly 10a and a second battery cell assembly 10b, the first battery cell assembly 10a and the second battery cell assembly 10b are arranged along a third direction Y, and both the first battery cell assembly 10a and the second battery cell assembly 10b include a plurality of battery cells 11 stacked along a first direction X; the battery cells 11 in the first battery cell assembly 10a have a first shoulder region 112a adjacent to the second battery cell assembly 10b, and the battery cells 11 in the second battery cell assembly 10b have a second shoulder region 112b adjacent to the first battery cell assembly 10a; the tensioning member 50 includes a first tensioning member 51, the first tensioning member 51 being disposed in at least one of the first shoulder region 112a and the second shoulder region 112b.

[0290] The first battery cell assembly 10a and the second battery cell assembly 10b can be regarded as two units. Each unit includes a plurality of battery cells 11 stacked along the first direction X. The two units are arranged along the third direction Y so that more battery cells 11 can be arranged in the third direction Y.

[0291] The first shoulder region 112a is the shoulder region 112 of the battery cell 11 in the first battery cell assembly 10a that is close to the second battery cell assembly 10b. For example, the first battery cell assembly 10a includes a plurality of first battery cells stacked along the first direction X, and the first shoulder region 112a is the shoulder region 112 of the first battery cell that is close to the second battery cell assembly 10b.

[0292] The second shoulder region 112b is the shoulder region 112 of the battery cell 11 in the second battery cell assembly 10b that is close to the first battery cell assembly 10a. For example, the second battery cell assembly 10b includes a plurality of second battery cells stacked along the first direction X, and the second shoulder region 112b is the shoulder region 112 of the second battery cell that is close to the first battery cell assembly 10a. The second shoulder region 112b is disposed adjacent to the first shoulder region 112a.

[0293] The first tensioning member 51 can be disposed in the first shoulder region 112a, or the first tensioning member 51 can be disposed in the second shoulder region 112b, or the first tensioning member 51 can be disposed in both the first shoulder region 112a and the second shoulder region 112b. When the first tensioning member 51 is disposed in both the first shoulder region 112a and the second shoulder region 112b, the number of the first tensioning member 51 can be one, which is disposed in both the first shoulder region 112a and the second shoulder region 112b; or the number of the first tensioning member 51 can be two, with one of the two first tensioning members 51 disposed in the first shoulder region 112a and the other disposed in the second shoulder region 112b.

[0294] In the above scheme, the first tensioning member 51 is disposed in at least one of the first shoulder region 112a and / or the second shoulder region 112b, so that the first tensioning member 51 has a better binding effect on the battery cell 11 of the first battery cell assembly 10a and / or the battery cell 11 of the second battery cell assembly 10b.

[0295] Please refer to Figure 8 According to some embodiments of this application, the first tensioning member 51 has a first end 51a connected to the first sidewall 22; the battery device 100 also includes a first busbar 60, which is configured to avoid the first end 51a and electrically connected to the first battery cell assembly 10a and the second battery cell assembly 10b.

[0296] The first end 51a is the end of the first tensioning member 51 used for connection with the first sidewall 22.

[0297] "The first busbar 60 is configured to avoid the first end 51a" means that the first busbar 60 can cross the first end 51a on the side of the first tensioner 51 away from the bottom wall 21, or the first busbar 60 can cross the first end 51a on the side of the first tensioner 51 facing the bottom wall 21, or the first busbar 60 can bypass the first end 51a.

[0298] "The first busbar component 60 bypasses the first end 51a" means that on the same projection plane perpendicular to the second direction Z, the orthographic projection of the first busbar component 60 does not overlap with the orthographic projection of the first end 51a, so as to reduce the risk of interference between the first busbar component 60 and the first end 51a, and at the same time, it can reduce the space occupied by the first busbar component 60 in the second direction Z.

[0299] The first busbar component 60 is electrically connected to the first battery cell assembly 10a and the second battery cell assembly 10b, so that the electrical energy of the first battery cell assembly 10a and the electrical energy of the second battery cell assembly 10b are combined, so that the battery device 100 has a high power capacity.

[0300] In the above scheme, the first busbar 60 is electrically connected to the first battery cell assembly 10a and the second battery cell assembly 10b to combine the electrical energy of the first battery cell assembly 10a and the second battery cell assembly 10b; the first busbar 60 is configured to avoid the first end 51a, which can reduce the risk of interference between the first busbar 60 and the first tensioning member 51.

[0301] Please refer to Figure 8 and further refer to Figure 11 , Figure 11 This is a schematic diagram illustrating the assembly of a first busbar component and a second groove according to some embodiments of this application. According to some embodiments of this application, a second groove 226 is provided on a first surface 224, located between a first end 51a and a second surface 225 along a first direction X. The first busbar component 60 includes a first connecting portion 61, a second connecting portion 62, and a third connecting portion 63. The first connecting portion 61 is electrically connected to a first battery cell assembly 10a, the second connecting portion 62 is electrically connected to a second battery cell assembly 10b, and the third connecting portion 63 connects the first connecting portion 61 and the second connecting portion 62. At least a portion of the third connecting portion 63 is located within the second groove 226.

[0302] The second groove 226 is formed by the first surface 224 being recessed towards the bottom wall 21 to form a groove-like structure.

[0303] The second groove 226 can be regarded as a clearance groove provided on the first surface 224, which is used to accommodate a part of the first busbar component 60 to avoid the first end 51a.

[0304] In some embodiments, a first cavity 22a is formed inside the first sidewall 22, and a first groove 212e can communicate with the first cavity 22a to accommodate the first manifold 60.

[0305] In some embodiments, the first busbar component 60 can be integrally formed. For example, the first busbar component 60 can be formed by bending a long strip structure. Before bending the first busbar component 60, the first connecting part 61, the third connecting part 63 and the first connecting part 62 can be arranged sequentially along the length direction of the first busbar component 60. After bending the first busbar component 60, the third connecting part 63 forms a U-shaped structure, and the first connecting part 61 and the second connecting part 62 are arranged in parallel.

[0306] In some embodiments, the first connection portion 61 can be welded to the electrode terminal 11b of the battery cell 11 of the first battery cell assembly 10a, and the second connection portion 62 can be welded to the electrode terminal 11b of the battery cell 11 of the second battery cell assembly 10b. The first busbar component 60 can enable the first battery cell assembly 10a and the second battery cell assembly 10b to be connected in series or in parallel.

[0307] In some embodiments, since the first sidewall 22 has a certain dimension in the first direction X, the second groove 226 may have a certain groove width to accommodate the third connecting portion 63, provided that the second surface 225 is connected to the cover 20b and the first surface 224 is connected to the first end 51a. To reduce the space occupied by the second groove 226 in the first direction X, the thickness direction of the third connecting portion 63 is parallel to the groove width direction of the second groove 226, and the groove width direction of the second groove 226 is parallel to the first direction X; wherein, the thickness of the third connecting portion 63 is less than the length of the third connecting portion 63 and less than the width of the third connecting portion 63.

[0308] In the above scheme, the second groove 226 is located between the first end 51a and the second surface 225, which can utilize the space of the first sidewall 22 in the first direction X to reduce the space occupied by the second groove 226 in the first direction X; at least a part of the third connecting part 63 is located in the second groove 226, which can utilize the internal space of the first sidewall 22 to reduce the space occupied by the third connecting part 63 in the second direction Z, thereby reducing the risk of interference between the first busbar 60 and the cover 20b.

[0309] Please refer to Figure 12 , Figure 12This is a schematic diagram of the assembly of a first busbar and a first tensioner provided in some embodiments of this application. According to some embodiments of this application, the first tensioner 51 has a first end 51a connected to a first sidewall 22; the battery device 100 further includes a first busbar 60, which is used to electrically connect a first battery cell assembly 10a and a second battery cell assembly 10b; along the second direction Z, the first end 51a is located on the side of the first busbar 60 opposite to the battery cell assembly 10, and an insulating member 81 is provided between the first end 51a and the first busbar 60, and / or, an elastic member 82 is provided between the first end 51a and the first busbar 60.

[0310] In some embodiments, along the second direction Z, the insulating member 81 is disposed between the first end 51a and the first busbar member 60; or, along the second direction Z, the elastic member 82 is disposed between the first end 51a and the first busbar member 60; or, along the second direction Z, both the insulating member 81 and the elastic member 82 are disposed between the first end 51a and the first busbar member 60, and the insulating member 81 and the elastic member 82 may be stacked along the second direction Z.

[0311] In the above scheme, along the second direction Z, the first end 51a is located on the side of the first busbar 60 away from the battery cell assembly 10. The first end 51a and the first busbar 60 share the space in the second direction Z. The first tensioning member 51 can constrain the first busbar 60 to move in the direction away from the battery cell assembly 10, thereby improving the connection reliability between the first busbar 60 and the battery cell assembly 10. Furthermore, by providing an insulating member 81 between the first end 51a and the first busbar 60, the risk of short circuit between the first end 51a and the first busbar 60 can be reduced. By providing an elastic member 82 between the first end 51a and the first busbar 60, the force applied by the first end 51a to the first busbar 60 can be buffered, thereby reducing the risk of damage to the first busbar 60 and improving its service life.

[0312] Please refer to Figure 13 , Figure 13 This is an exploded view of the structure of a battery device provided in some other embodiments of this application. According to some embodiments of this application, the tensioning member 50 further includes a first side plate 71 and a second side plate 72 disposed opposite to each other along the third direction Y. Along the third direction Y, the first side plate 71 and the second side plate 72 are respectively located on both sides of the battery cell assembly 10; the two ends of the first side plate 71 are respectively connected to the first side wall 22 and the second side wall 23, and the first side plate 71 is connected to the beam structure 24; the two ends of the second side plate 72 are respectively connected to the first side wall 22 and the second side wall 23, and the second side plate 72 is connected to the beam structure 24; the third direction Y, the second direction Z and the first direction X are perpendicular to each other.

[0313] The first side plate 71 is a plate-shaped structure. In the second direction Z, one end of the first side plate 71 is connected to the bottom wall 21, and the other end of the first side plate 71 is connected to the cover 20b.

[0314] The second side plate 72 is a plate-shaped structure. In the second direction Z, one end of the second side plate 72 is connected to the bottom wall 21, and the other end of the first side plate 71 is connected to the cover 20b.

[0315] The first side plate 71 and the second side plate 72 are spaced apart along the third direction Y. The battery cell assembly 10 is disposed between the first side plate 71 and the second side plate 72. The first side plate 71 and the second side plate 72 can be regarded as two side beams of the box body 20a in the third direction Y, so as to protect the battery cell assembly 10 in the third direction Y.

[0316] The first side plate 71 is arranged along the first direction X. The two ends of the first side plate 71 along the first direction X are respectively connected to the first side wall 22 and the second side wall 23, and the first side plate 71 is connected to the beam structure 24 so that the box body 20a has high overall strength.

[0317] The second side plate 72 is arranged along the first direction X. The two ends of the second side plate 72 along the first direction X are respectively connected to the first side wall 22 and the second side wall 23, and the second side plate 72 is connected to the beam structure 24 so that the box body 20a has high overall strength.

[0318] In some embodiments, the first side plate 71 can be integrally extruded and the second side plate 72 can be integrally extruded, so that both the first side plate 71 and the second side plate 72 have high overall strength.

[0319] In some embodiments, the first side plate 71 is welded to the first side wall 22, the beam structure 24, the second side wall 23 and the bottom wall 21, and the second side plate 72 is welded to the first side wall 22, the beam structure 24, the second side wall 23 and the bottom wall 21, so that the box body 20a has high overall strength.

[0320] In the above scheme, the first side plate 71 and the second side plate 72 are located on both sides of the battery cell assembly 10 along the third direction Y. The two ends of the first side plate 71 are connected to the first side wall 22 and the second side wall 23 respectively, and the first side plate 71 is connected to the beam structure 24. The two ends of the second side plate 72 are connected to the first side wall 22 and the second side wall 23 respectively, and the second side plate 72 is connected to the beam structure 24. The first side plate 71, the first side wall 22, the second side plate 72 and the second side wall 23 together with the cover 20b form an accommodating space 20c to accommodate the battery cell assembly 10. At the same time, the first side plate 71 connects the first side wall 22 and the beam structure 24, and the second side plate 72 connects the first side wall 22 and the beam structure 24. This can tighten the first side wall 22 and the beam structure 24, resist the expansion force of the battery cell assembly 10, improve the constraint effect on the expansion deformation of the battery cell assembly 10, and thus improve the reliability of the battery device 100.

[0321] Please refer to Figure 13 and further refer to Figure 14 , Figure 14 This is an exploded view of the structure of the box body provided in some embodiments of this application. According to some embodiments of this application, a first cavity 22a is formed inside the first sidewall 22, and a first opening 22c and a second opening 22d are formed at both ends of the first sidewall 22 in the third direction Y, respectively, and both the first opening 22c and the second opening 22d are connected to the first cavity 22a; a second cavity 24a is formed inside the beam structure 24, and a third opening 24c and a fourth opening 24d are formed at both ends of the beam structure 24 in the third direction Y, respectively, and both the third opening 24c and the fourth opening 24d are connected to the second cavity 24a; a first side plate 71 closes the first opening 22c and the third opening 24c; a second side plate 72 closes the second opening 22d and the fourth opening 24d.

[0322] The first opening 22c and the third opening 24c are spaced apart along the first direction X. The first side plate 71 is correspondingly arranged with the first opening 22c and the third opening 24c. When the first side plate 71 is connected to the first side wall 22, the first side plate 71 closes the first opening 22c. When the first side plate 71 is connected to the beam structure 24, the first side plate 71 closes the third opening 24c.

[0323] The second opening 22d and the fourth opening 24d are spaced apart along the first direction X. The second side plate 72 is correspondingly arranged with the second opening 22d and the fourth opening 24d. When the second side plate 72 is connected to the first side wall 22, the second side plate 72 seals the second opening 22d. When the second side plate 72 is connected to the beam structure 24, the second side plate 72 closes the fourth opening 24d.

[0324] In the above scheme, a first cavity 22a is formed inside the first sidewall 22 to reduce the weight of the first sidewall 22, and a second cavity 24a is formed inside the beam structure 24 to reduce the weight of the beam structure 24, thereby reducing the overall weight of the battery device 100; the first side plate 71 closes the first opening 22c and the third opening 24c, and the first side plate 71 has a large connection area with the first sidewall 22 and the beam structure 24, which facilitates improving the connection reliability of the first side plate 71 with the first sidewall 22 and the beam structure 24; the second side plate 72 closes the second opening 22d and the fourth opening 24d, and the second side plate 72 has a large connection area with the first sidewall 22 and the beam structure 24, which facilitates improving the connection reliability of the second side plate 72 with the first sidewall 22 and the beam structure 24. Meanwhile, the first side plate 71 and the second side plate 72 can serve as side beams of the housing 20. The first side plate 71 closes the first opening 22c and the third opening 24c, and the second side plate 72 closes the second opening 22d and the fourth opening 24d, which can also improve the sealing performance of the housing 20.

[0325] Please refer to Figure 13 and Figure 14 According to some embodiments of this application, a first insert 711 and a second insert 712 are provided on the side of the first side plate 71 facing the second side plate 72. At least a portion of the first insert 711 is embedded in the first opening 22c, and at least a portion of the second insert 712 is embedded in the third opening 24c. A third insert 721 and a fourth insert 722 are provided on the side of the second side plate 72 facing the first side plate 71. At least a portion of the third insert 721 is embedded in the second opening 22d, and at least a portion of the fourth insert 722 is embedded in the fourth opening 24d.

[0326] The first insert 711 is disposed on the side of the first side plate 71 facing the second side plate 72, and is correspondingly disposed to the first opening 22c. The outline of the first insert 711 can match the outline of the first opening 22c, so as to facilitate the assembly of the first insert 711 with the first opening 22c and to constrain the separation of the first insert 711 from the first opening 22c. The first insert 711 can be welded to the first side plate 71 so that the first insert 711 and the first side plate 71 are firmly connected; or, the first insert 711 can be integrally formed with the first side plate 71.

[0327] In some embodiments, when the first insert 711 is assembled with the first opening 22c, the first insert 711 can contact and connect with the wall portion of the first sidewall 22 that forms the first opening 22c.

[0328] The second insert 712 is disposed on the side of the first side plate 71 facing the second side plate 72, and is correspondingly disposed to the third opening 24c. The outline of the second insert 712 can match the outline of the third opening 24c to facilitate assembly of the second insert 712 and the third opening 24c, and to constrain the separation of the second insert 712 and the third opening 24c. The second insert 712 can be welded to the first side plate 71 to ensure a firm connection between the second insert 712 and the first side plate 71; or, the second insert 712 can be integrally formed with the first side plate 71.

[0329] In some embodiments, when the second insert 712 is assembled with the third opening 24c, the second insert 712 can be in contact with the wall portion of the beam structure 24 that forms the third opening 24c.

[0330] The third insert 721 is disposed on the side of the second side plate 72 facing the first side plate 71, and is correspondingly disposed to the second opening 22d. The outline of the third insert 721 can match the outline of the second opening 22d to facilitate assembly of the third insert 721 and the second opening 22d, and to constrain the separation of the third insert 721 and the second opening 22d. The third insert 721 can be welded to the second side plate 72 to ensure a firm connection between the third insert 721 and the second side plate 72; or, the third insert 721 can be integrally formed with the second side plate 72.

[0331] In some embodiments, when the third insert 721 is assembled with the second opening 22d, the third insert 721 can contact and connect with the wall portion of the first sidewall 22 that forms the second opening 22d.

[0332] The fourth insert 722 is disposed on the side of the second side plate 72 facing the first side plate 71, and corresponds to the fourth opening 24d. The outline of the fourth insert 722 can match the outline of the fourth opening 24d to facilitate assembly of the fourth insert 722 and the fourth opening 24d, and to constrain the separation of the fourth insert 722 and the fourth opening 24d. The fourth insert 722 can be welded to the second side plate 72 to ensure a firm connection between the fourth insert 722 and the second side plate 72; alternatively, the fourth insert 722 can be integrally formed with the second side plate 72.

[0333] In some embodiments, when the fourth insert 722 is assembled with the fourth opening 24d, the fourth insert 722 can be in contact with the wall portion of the beam structure 24 that forms the fourth opening 24d.

[0334] When the first side plate 71 is assembled with the first side wall 22 and the beam structure 24, the assembly positioning of the first side plate 71 can be achieved by embedding at least a portion of the first insert 711 into the first opening 22c and at least a portion of the second insert 712 into the third opening 24c, thereby improving assembly efficiency.

[0335] When the second side plate 72 is assembled with the first side wall 22 and the beam structure 24, the assembly positioning of the second side plate 72 can be achieved by embedding at least a portion of the third insert 721 into the second opening 22d and at least a portion of the fourth insert 722 into the fourth opening 24d, thereby improving assembly efficiency.

[0336] In the above scheme, at least a portion of the first insert 711 is embedded in the first opening 22c, and at least a portion of the second insert 712 is embedded in the third opening 24c, further improving the connection reliability between the first side plate 71 and the first side wall 22 and the beam structure 24, and improving the constraint effect on the expansion and deformation of the battery cell assembly 10; at least a portion of the third insert 721 is embedded in the second opening 22d, and at least a portion of the fourth insert 722 is embedded in the fourth opening 24d, further improving the connection reliability between the second side plate 72 and the first side wall 22 and the beam structure 24, and improving the constraint effect on the expansion and deformation of the battery cell assembly 10, thereby improving the reliability of the battery device 100.

[0337] Please refer to Figure 14 According to some embodiments of this application, the first side plate 71 includes a plurality of first sub-side plates 713, which are distributed sequentially along the first direction X, and adjacent first sub-side plates 713 are connected to each other; the second side plate 72 includes a plurality of second sub-side plates 723, which are distributed sequentially along the first direction X, and adjacent second sub-side plates 723 are connected to each other.

[0338] In some embodiments, the battery device 100 has a large dimension in the first direction X, resulting in both the first side plate 71 and the second side plate 72 having large dimensions in the first direction X. If the first side plate 71 and the second side plate 72 are independent structures, the processing of the first side plate 71 and the second side plate 72 becomes more difficult, and the first side plate 71 and the second side plate 72 are easily deformed under stress, affecting the reliability of the battery device 100. In this embodiment, the first side plate 71 includes a plurality of first sub-side plates 713, which are sequentially distributed along the first direction X, and adjacent first sub-side plates 713 are interconnected, facilitating processing and manufacturing. Furthermore, the first side plate 71 has high overall strength and is not easily deformed under stress. The second side plate 72 includes a plurality of second sub-side plates 723, which are sequentially distributed along the first direction X, and adjacent second sub-side plates 723 are interconnected, facilitating processing and manufacturing. Furthermore, the second side plate 72 has high overall strength and is not easily deformed under stress.

[0339] In some embodiments, two adjacent first sub-side plates 713 are welded together and two adjacent second sub-side plates 723 are welded together, so that the first side plate 71 has high overall strength and the second side plate 72 has high overall strength.

[0340] In the above scheme, when the size of the battery device 100 in the first direction X is large, the size of the first side plate 71 and the second side plate 72 in the first direction X is also large, and the processing and manufacturing difficulty of the first side plate 71 and the second side plate 72 is high. In this embodiment, by dividing the first side plate 71 into multiple first sub-side plates 713 and the second side plate 72 into multiple second sub-side plates 723, the processing and manufacturing difficulty can be reduced. At the same time, two adjacent first sub-side plates 713 are connected to each other, so that the first side plate 71 has high overall strength; two adjacent second sub-side plates 723 are connected to each other, so that the second side plate 72 has high overall strength. This facilitates the improvement of the structure composed of the first side plate 71, the first side wall 22, the second side plate 72 and the beam structure 24 to resist the expansion of the battery cell assembly 10, so as to constrain the expansion and deformation of the battery cell assembly 10.

[0341] Please refer to Figure 14 According to some embodiments of this application, two adjacent first sub-side plates 713 are mortised and tenoned, and two adjacent second sub-side plates 723 are mortised and tenoned.

[0342] One of the two adjacent first sub-side plates 713 is provided with a tenon, and the other with a mortise. The tenon and mortise interlock to form a rigid connection, distributing pressure and enhancing the stability of the overall structure, thus giving the first side plate 71 high overall strength. Furthermore, the two adjacent first sub-side plates 713 are welded together, further improving the overall strength of the first side plate 71.

[0343] One of the two adjacent second sub-side plates 723 is provided with a tenon, and the other with a mortise. The tenon and mortise interlock to form a rigid connection, distributing pressure and enhancing the stability of the overall structure, thus giving the second side plate 72 high overall strength. Furthermore, the two adjacent second sub-side plates 723 are welded together, further improving the overall strength of the second side plate 72.

[0344] In the above scheme, the two adjacent first sub-side plates 713 are connected by mortise and tenon joints, which further improves the overall strength of the first side plate 71. The two adjacent second sub-side plates 723 are connected by mortise and tenon joints, which further improves the overall strength of the second side plate 72. This improves the structure composed of the first side plate 71, the first side wall 22, the second side plate 72 and the beam structure 24, which has an anti-expansion ability for the battery cell assembly 10 and improves the reliability of the battery device 100.

[0345] Please refer to Figure 13 and Figure 14According to some embodiments of this application, the battery cell assembly 10 includes a first battery cell assembly 10a and a second battery cell assembly 10b, which are arranged along a third direction Y; the tensioning member 50 also includes a third side plate 73, which is located between the first battery cell assembly 10a and the second battery cell assembly 10b along the third direction Y, and the third side plate 73 connects the first side wall 22 and the beam structure 24.

[0346] The first battery cell assembly 10a and the second battery cell assembly 10b are arranged along the third direction Y, and the third side plate 73 is located on the first battery cell assembly 10a and the second battery cell assembly 10b, so that the first battery cell assembly 10a and the second battery cell assembly 10b are separated by the third side plate 73.

[0347] The third side plate 73 extends along the first direction X, and its two ends along the first direction X are respectively connected to the first sidewall 22 and the beam structure 24, thereby improving the first sidewall 22 and the beam structure 24's resistance to expansion of the battery cell assembly 10. In some embodiments, the third side plate 73 can be welded to the first sidewall 22 and the beam structure 24 to ensure a firm connection between the third side plate 73 and the first sidewall 22 and the beam structure 24, further improving the first sidewall 22 and the beam structure 24's ability to resist the expansion and deformation of the battery cell assembly 10.

[0348] In the above scheme, the first battery cell assembly 10a and the second battery cell assembly 10b are arranged along the third direction Y. The third side plate 73 is disposed between the first battery cell assembly 10a and the second battery cell assembly 10b to separate the first battery cell assembly 10a and the second battery cell assembly 10b. At the same time, the third side plate 73 connects the first side wall 22 and the beam structure 24, which can improve the expansion resistance of the first side wall 22 and the beam structure 24 and facilitate the constraint of the expansion deformation of the battery cell assembly 10.

[0349] Please refer to Figure 13 and Figure 14 According to some embodiments of this application, the first sidewall 22 is provided with a first through hole 227, which penetrates the first sidewall 22 along the first direction X; the beam structure 24 is provided with a second through hole 244, which penetrates the beam structure 24 along the first direction X; and the third side plate 73 passes through the first through hole 227 and the second through hole 244.

[0350] The first through hole 227 is a through hole that penetrates the first side wall 22 along the first direction X. When the third side plate 73 is assembled with the first side wall 22, the third side plate 73 is inserted into the first through hole 227.

[0351] The second through hole 244 is a through hole that penetrates the beam structure 24 along the first direction X. When the third side plate 73 is assembled with the beam structure 24, the third side plate 73 is inserted into the second through hole 244.

[0352] When the third side plate 73 is assembled with the first side wall 22 and the beam structure 24, the third side plate 73 can pass through the first side wall 22 from one end of the first side wall 22 away from the beam structure 24 and extend to connect with the beam structure 24; or, the third side plate 73 can pass through the beam structure 24 from one end of the beam structure 24 away from the first side wall 22 and extend to connect with the first side wall 22; or, the third side plate 73 includes at least two interconnected parts, one part passing through the first side wall 22 from one end of the first side wall 22 away from the beam structure 24 and the other part passing through the beam structure 24 from one end of the beam structure 24 away from the first side wall 22, and then the at least two parts are interconnected.

[0353] In some embodiments, the third side plate 73 is welded to the first side wall 22 on opposite sides along the first direction X, and the third side plate 73 is welded to the beam structure 24 on opposite sides along the first direction X, so that the third side plate 73 is firmly connected to the first side wall 22 and the third side plate 73 is firmly connected to the beam structure 24.

[0354] In the above scheme, the first through hole 227 penetrates the first side wall 22 along the first direction X, the second through hole 244 penetrates the beam structure 24 along the first direction X, and the third side plate 73 passes through the first through hole 227 and the second through hole 244, so as to facilitate the assembly of the third side plate 73 with the first side wall 22 and the beam structure 24, thereby improving the assembly efficiency.

[0355] Please refer to Figure 13 and Figure 14 According to some embodiments of this application, a fifth insert 731 is provided at one end of the third side plate 73, and a third groove 228 is provided on the side of the first side wall 22 away from the battery cell assembly 10. The third groove 228 communicates with the first through hole 227, and at least a portion of the fifth insert 731 is embedded in the third groove 228.

[0356] The fifth insert 731 is disposed at one end of the back beam structure 24 of the third side plate 73. The fifth insert 731 can be regarded as a limiting structure formed at one end of the back beam structure 24 of the third side plate 73. The fifth insert 731 is used to cooperate with the first side wall 22 to restrict the third side plate 73 from disengaging from the first side wall 22 toward the battery cell assembly 10.

[0357] The contour of the third groove 228 matches the contour of the fifth insert 731, facilitating the assembly and positioning of the third side plate 73 with the first side wall 22. When the third side plate 73 is assembled with the first side wall 22 and the beam structure 24, the third side plate 73 can pass through the third groove 228 and the first through hole 227 in sequence, and pass through the second through hole 244. At least a portion of the fifth insert 731 is embedded in the third groove 228, and the third side plate 73 is connected to the first side wall 22 and the beam structure 24.

[0358] In some embodiments, after the third side plate 73 passes through the second through hole 244, a portion of the third side plate 73 can also pass through the beam structure 24 and be bent to form a limiting structure on the side of the beam structure 24 away from the first side wall 22, and the bent portion is welded to the beam structure 24 to restrict the third side plate 73 from detaching from the beam structure 24, thereby further improving the connection reliability between the third side plate 73 and the beam structure 24.

[0359] In the above scheme, by embedding at least a portion of the fifth insert 731 in the third groove 228, the third side plate 73 is restricted from detaching from the first side wall 22 toward the battery cell assembly 10, which can increase the connection reliability between the third side plate 73 and the first side wall 22 and improve the expansion resistance of the first side wall 22.

[0360] Please refer to Figure 14 According to some embodiments of this application, the third side plate 73 includes a plurality of third sub-side plates 732, which are distributed sequentially along the first direction X, and adjacent third sub-side plates 732 are connected to each other.

[0361] In some embodiments, the battery device 100 has a large dimension in the first direction X, resulting in a large dimension of the third side plate 73 in the first direction X. If the third side plate 73 is an independent structure, its processing is difficult, and it is prone to deformation under stress, affecting the reliability of the battery device 100. In this embodiment, the third side plate 73 includes multiple third sub-side plates 732, which are distributed sequentially along the first direction X. Adjacent third sub-side plates 732 are interconnected, facilitating processing and manufacturing. Furthermore, the third side plate 73 has high overall strength and is not easily deformed under stress.

[0362] In some embodiments, two adjacent third sub-side plates 732 are welded together to give the third side plate 73 higher overall strength.

[0363] In the above scheme, when the size of the battery device 100 in the first direction X is large, the size of the third side plate 73 in the first direction X is also large, and the processing and manufacturing difficulty of the third side plate 73 is high. In this embodiment, by dividing the third side plate 73 into multiple third sub-side plates 732, the processing and manufacturing difficulty can be reduced. At the same time, two adjacent third sub-side plates 732 are connected to each other so that the third side plate 73 has high overall strength, which facilitates the improvement of the structure composed of the first side wall 22, the third side plate 73 and the beam structure 24 to resist the expansion of the battery cell assembly 10, and further improves the constraint effect on the expansion deformation of the battery cell assembly 10.

[0364] Please refer to Figure 14 According to some embodiments of this application, two adjacent third sub-side plates 732 are mortise and tenon connected.

[0365] One of the two adjacent third sub-side plates 732 is provided with a tenon, and the other with a mortise. The tenon and mortise interlock to form a rigid connection, distributing pressure and enhancing the stability of the overall structure, thus giving the third side plate 73 high overall strength. Furthermore, the two adjacent third sub-side plates 732 are welded together, further improving the overall strength of the third side plate 73.

[0366] In the above scheme, the two adjacent third sub-side plates 732 are connected by mortise and tenon joints, which further improves the overall strength of the third side plate 73, thereby improving the anti-expansion ability of the first side wall 22 and the beam structure 24 to the battery cell assembly 10 and improving the reliability of the battery device 100.

[0367] Please refer to Figure 13 According to some embodiments of this application, the cover 20b is connected to the first side wall 22, the second side wall 23, the first side plate 71 and the second side plate 72, and the cover 20b, the bottom wall 21, the first side wall 22, the second side wall 23, the first side plate 71 and the second side plate 72 form an accommodating space 20c.

[0368] The cover 20b, bottom wall 21, first side wall 22, second side wall 23, first side plate 71 and second side plate 72 form an accommodating space 20c. The first side plate 71 and the second side plate 72 are two side beams spaced apart in the third direction Y of the box 20. The first side plate 71 is sealed to the cover 20b, the first side wall 22, the second side wall 23 and the bottom wall 21, and the second side plate 72 is sealed to the cover 20b, the first side wall 22, the second side wall 23 and the bottom wall 21.

[0369] In some embodiments, the cover 20b can be a plate-like structure, the first side plate 71 can be designed to be larger in size in the second direction Z, and the end of the first side plate 71 away from the bottom wall 21 is connected to the cover 20b; the second side plate 72 can be designed to be larger in size in the second direction Z, and the end of the second side plate 72 away from the bottom wall 21 is connected to the cover 20b.

[0370] In the above scheme, the cover 20b, bottom wall 21, first side wall 22, second side wall 23, first side plate 71 and second side plate 72 form an accommodating space 20c. The first side plate 71 and the second side plate 72 respectively constitute the side beams of the box 20. The size of the cover 20b in the second direction Z can be designed to be smaller in order to save the material and manufacturing cost of the cover 20b.

[0371] Please refer to Figure 13 According to some embodiments of this application, the cover 20b includes a top wall 25, a first flange 28 and a second flange 29. The first flange 28 and the second flange 29 are respectively formed at both ends of the top wall 25 in the third direction Y. The first flange 28 and the second flange 29 both extend toward the bottom wall 21. The first flange 28 is connected to the first side plate 71, the first side wall 22 and the second side wall 23, and the second flange 29 is connected to the second side plate 72, the first side wall 22 and the second side wall 23.

[0372] The first flange 28 and the second flange 29 are formed by bending the top wall 25 toward the bottom wall 21 at both ends in the third direction Y. The dimension of the first flange 28 in the second direction Z is smaller than the dimension of the first side plate 71 in the second direction Z, and the dimension of the second flange 29 in the second direction Z is smaller than the dimension of the second side plate 72 in the second direction Z.

[0373] When the cover 20b is assembled with the first side wall 22, the top wall 25 is connected to the end of the first side wall 22 that is away from the bottom wall 21, and the first flange 28 and the second flange 29 are respectively connected to the two ends of the first side wall 22 in the third direction Y.

[0374] When the cover 20b is assembled with the second side wall 23, the top wall 25 is connected to the end of the second side wall 23 that is away from the bottom wall 21, and the first flange 28 and the second flange 29 are respectively connected to the two ends of the second side wall 23 in the third direction Y.

[0375] In the above scheme, the first flange 28 and the second flange 29 are respectively formed at both ends of the top wall 25 in the third direction Y. The cover 20b has a simple structure and is easy to process and manufacture. The first flange 28 is connected to the first side plate 71, the first side wall 22 and the second side wall 23, and the second flange 29 is connected to the second side plate 72, the first side wall 22 and the second side wall 23, so that the cover 20b and the box body 20a can form an accommodating space 20c, which is convenient for assembly.

[0376] Please refer to Figure 5 According to some embodiments of this application, the bottom wall 21 includes a first region Q, which is a solid region, and the mounting part 21a includes an internally threaded hole 21b located in the first region Q. The internally threaded hole 21b extends along the second direction Z and its opening is located on the outer surface 21c of the bottom wall 21.

[0377] In some embodiments, the first region Q can be the region with the greatest thickness of the bottom wall 21. There can be multiple first regions Q, and the multiple first regions Q can be distributed at intervals along the first direction X.

[0378] The thickness direction of the bottom wall 21 can be parallel to the second direction Z. The maximum bottom wall thickness in the first region Q is the thickness of the bottom wall 21 at the maximum thickness in the first region Q. The bottom wall 21 in the first region Q can be a uniform thickness structure, or the bottom wall 21 in the first region Q can be a locally thickened structure. The bottom wall thickness in the first region Q refers to the thickness of the bottom wall 21 in the first region Q, and the distance between the outer surface 21c and the inner surface of the bottom wall 21 along the second direction Z. The outer surface 21c of the bottom wall 21 refers to the surface of the bottom wall 21 facing away from the battery cell assembly 10 along the second direction Z, and the inner surface of the bottom wall 21 refers to the surface of the bottom wall 21 facing the battery cell assembly 10 along the second direction Z.

[0379] The first region Q is a solid region, and the first region Q has high overall strength.

[0380] The internal threaded hole 21b can be a threaded hole formed in the bottom wall 21, or the internal threaded hole 21b can also be a threaded hole of an insert provided in the bottom wall 21.

[0381] The internal threaded hole 21b extends along the second direction Z to facilitate the installation of the locking member along the second direction Z, so as to facilitate the locking member to lock the battery device 100 to the device body of the power device along the second direction Z.

[0382] The opening of the internal threaded hole 21b is located on the outer surface 21c of the bottom wall 21. The internal threaded hole 21b is exposed on the outer side of the bottom wall 21. During the assembly of the battery device 100 and the device body of the power device, the locking member can extend into the internal threaded hole 21b from the outer side of the bottom wall 21 toward the inner side.

[0383] In the above scheme, the first region Q is a solid region with high overall strength, which facilitates the installation of the mounting part 21a and improves the connection reliability between the battery device 100 and the device body of the power device; the internal threaded hole 21b extends along the second direction Z and the opening is located on the outer surface 21c of the bottom wall 21, so that the locking member can extend into the internal threaded hole 21b from the outside of the bottom wall 21 toward the inside, and lock the battery device 100 to the device body of the power device.

[0384] Please refer to Figure 15 , Figure 15 This is a schematic diagram of the structure of the first region of the bottom wall provided in some embodiments of this application. According to some embodiments of this application, the bottom wall 21 includes a first region Q, the first region Q is at least partially provided with a cavity structure K, the mounting part 21a includes an insert 90, the insert 90 is provided with an internal threaded hole 21b and is embedded in the cavity structure K, and the outer surface 21c of the bottom wall 21 is provided with a third through hole 21d, and the third through hole 21d communicates with the internal threaded hole 21b.

[0385] Insert 90 is a component with an internal threaded hole 21b. Insert 90 is embedded in the cavity structure K and connected to the bottom wall 21. For example, insert 90 can be welded to the bottom wall 21 to ensure a high connection reliability between insert 90 and bottom wall 21.

[0386] The maximum bottom wall thickness of the first region Q is greater than the maximum bottom wall thickness of other regions, resulting in a thicker bottom wall 21 in the first region Q. The first region Q includes a first wall portion 214 and a second wall portion 215 disposed opposite each other along the second direction Z, defining a cavity structure K; a third through hole 21d is disposed in the first wall portion 214 and penetrates the first wall portion 214 along the second direction Z, communicating with the cavity structure K so that the insert 90 can be embedded in the cavity structure K.

[0387] In some embodiments, after the insert 90 is assembled with the bottom wall 21, the insert 90 may not protrude from the outer surface 21c of the bottom wall 21 to reduce the risk of the insert 90 interfering with other components.

[0388] In the above scheme, the insert 90 is provided with an internal threaded hole 21b. The insert 90 is embedded in the cavity structure K of the first region Q, which facilitates processing and manufacturing, allows for flexible assembly, and improves the connection reliability between the battery device 100 and the device body of the power-consuming device. The insert 90 is embedded in the cavity structure K, and the third through hole 21d communicates with the internal threaded hole 21b. The insert 90 does not protrude from the outer surface 21c of the bottom wall 21, reducing the space occupied by the insert 90 in the second direction Z and reducing the risk of interference between the insert 90 and other components. For example, when assembling the battery device 100 and the device body of the power-consuming device, one end of the locking member can first pass through the third through hole 21d and then extend into the internal threaded hole 21b, which facilitates locking the battery device 100 and the device body of the power-consuming device from the outside to the inside of the bottom wall 21.

[0389] According to some embodiments of this application, along the second direction Z, the bottom wall 21 corresponds to the first side wall 22 (see reference). Figure 5 ) and beam structure 24 (please refer to) Figure 5 The region ) is the first region Q.

[0390] The number of first regions Q can be two. The two first regions Q are set at intervals along the first direction X. The two first regions Q correspond to the first sidewall 22 and the beam structure 24, respectively. For example, on the same projection plane perpendicular to the second direction Z, the orthographic projection of the first sidewall 22 and the orthographic projection of the first region Q overlap at least partially, and the orthographic projection of the beam structure 24 and the orthographic projection of the first region Q overlap at least partially.

[0391] In some embodiments, the internal threaded hole 21b includes a first internal threaded hole 211a corresponding to the first sidewall 22 and a second internal threaded hole 212a corresponding to the beam structure 24.

[0392] In the above scheme, the first region Q corresponds to the first sidewall 22 and the beam structure 24. The first sidewall 22 and the beam structure 24 are both hollow structures. The bottom wall 21 located in the first region Q has a large bottom wall thickness so as to make use of the internal space of the first sidewall 22 and the beam structure 24 and reduce the space occupied by the bottom wall on the side away from the battery cell assembly 10 along the second direction Z.

[0393] Please refer to Figure 5 and further refer to Figure 16 , Figure 16 for Figure 5The enlarged view at point A shows that, according to some embodiments of this application, the first sub-bottom wall 211 includes a first part 211b and a second part 211c. On the same projection plane perpendicular to the second direction Z, the orthographic projection of the first part 211b overlaps with the orthographic projection of the first sidewall 22, while the orthographic projection of the second part 211c does not overlap with the orthographic projection of the first sidewall 22. The thickness of the first part 211b is greater than the thickness of the second part 211c. Along the second direction Z, the first part 211b protrudes from the side of the second part 211c facing the cover 20b. The first part 211b constitutes part of the first region Q, and the first part 211b is provided with a first internal threaded hole 211a.

[0394] The first part 211b and the second part 211c are two parts that constitute the first sub-bottom wall 211. The first part 211b and the second part 211c can be integrally formed.

[0395] The thickness direction of the first part 211b and the thickness direction of the second part 211c are both parallel to the second direction Z.

[0396] With the second direction Z as the projection direction, the orthographic projection of the first part 211b overlaps with the orthographic projection of the first sidewall 22, while the orthographic projection of the second part 211c does not overlap with the orthographic projection of the first sidewall 22. Along the first direction X, the second part 211c can be located at one end of the first part 211b near the second sub-bottom wall 212.

[0397] In some embodiments, the first cavity 22a of the first sidewall 22 has an opening toward the first sub-bottom wall 211, and the first portion 211b closes the opening. Along the first direction X, the second portion 211c protrudes from the first sidewall 22, and the second portion 211c carries part of the battery cell assembly 10; optionally, the first sub-bottom wall 211 and the first sidewall 22 are integrally formed, so that the structure formed by the first sub-bottom wall 211 and the first sidewall 22 has high overall strength to resist the expansion force of the battery cell assembly 10.

[0398] In some embodiments, the overall thickness of the first portion 211b is greater than the thickness of the second portion 211c. A protruding structure can be formed on the side of the first portion 211b facing the first sidewall 22, and a first internal threaded hole 211a can be disposed in the protruding structure to give the first portion 211b higher strength. Since the first portion 211b is correspondingly disposed to the first sidewall 22, a first cavity 22a is formed inside the first sidewall 22. The first portion 211b can protrude toward the first sidewall 22, so that part of the structure of the first portion 211b can be located in the first cavity 22a. By utilizing the space of the first cavity 22a, the space occupied by the first portion 211b in the second direction Z is reduced.

[0399] In some embodiments, on the side of the first sub-bottom wall 211 opposite to the first side wall 22, the surface of the first portion 211b and the surface of the second portion 211c may be coplanar, so that the first sub-bottom wall 211 can be connected to the device body of the electrical device.

[0400] In the above scheme, the first cavity 22a of the first sidewall 22 has an opening facing the first sub-bottom wall 211, which is closed by the first sub-bottom wall 211. The orthographic projection of the first part 211b overlaps with the orthographic projection of the first sidewall 22, and the thickness of the first part 211b is greater than the thickness of the second part 211c. The first part 211b protrudes along the second direction Z from the side of the second part 211c facing the cover 20b. The first part 211b can utilize the space of the first cavity 22a. The size of the first part 211b in the second direction Z is designed to be relatively large. The first internal threaded hole 211a is provided in the first part 211b. While satisfying the requirement that the size of the first internal threaded hole 211a in the second direction Z is relatively large, the size of the first internal threaded hole 211a extending beyond the outer side of the first sub-bottom wall 211 along the second direction Z can be reduced. At the same time, the larger thickness of the first part 211b facilitates the improvement of the connection reliability between the battery device 100 and the device body of the power-consuming device.

[0401] Please refer to Figure 5 and Figure 16 According to some embodiments of this application, the first sidewall 22 includes a first wall body 221, a second wall body 222, and a third wall body 223. The first wall body 221 and the second wall body 222 are disposed opposite to each other along a first direction X. One end of the first wall body 221 is connected to the first sub-bottom wall 211, one end of the second wall body 222 is connected to the first sub-bottom wall 211, and the third wall body 223 connects the end of the first wall body 221 away from the first sub-bottom wall 211 and the end of the second wall body 222 away from the first sub-bottom wall 211. The first wall body 221, the second wall body 222, and the third wall body 223 form a first cavity 22a. The first cavity 22a has an opening facing the first sub-bottom wall 211. The first portion 211b of the first sub-bottom wall 211 closes the opening, and the second wall body 222 abuts against the battery cell assembly 10.

[0402] Please refer to Figure 5 and further refer to Figure 17 , Figure 17 for Figure 5A partial enlarged view at point B. According to some embodiments of this application, the second sub-bottom wall 212 includes a third part 212b and a fourth part 212c. On the same projection plane perpendicular to the second direction Z, the orthographic projection of the third part 212b overlaps with the orthographic projection of the beam structure 24, while the orthographic projection of the fourth part 212c does not overlap with the orthographic projection of the beam structure 24. The thickness of the third part 212b is greater than the thickness of the fourth part 212c. Along the second direction Z, the third part 212b protrudes from the side of the fourth part 212c facing the cover 20b. The third part 212b constitutes another part of the first region Q. The third part 212b is provided with a second internal threaded hole 212a.

[0403] The third part 212b and the fourth part 212c are two parts that constitute the second sub-bottom wall 212. The third part 212b and the fourth part 212c can be integrally formed.

[0404] With the second direction Z as the projection direction, the orthographic projection of the third part 212b overlaps with the orthographic projection of the beam structure 24, while the orthographic projection of the fourth part 212c does not overlap with the orthographic projection of the beam structure 24. Along the first direction X, the fourth part 212c can be located at one end of the third part 212b near the first sub-bottom wall 211.

[0405] In some embodiments, the second cavity 24a of the beam structure 24 has an opening toward the second sub-bottom wall 212, and the third portion 212b closes the opening. Along the first direction X, the fourth portion 212c protrudes from the beam structure 24 and carries part of the battery cell assembly 10; optionally, the second sub-bottom wall 212 is integrally formed with the beam structure 24, so that the structure formed by the second sub-bottom wall 212 and the beam structure 24 has high overall strength to resist the expansion force of the battery cell assembly 10.

[0406] In some embodiments, the overall thickness of the third portion 212b is greater than the thickness of the fourth portion 212c. A protruding structure can be formed on the side of the third portion 212b facing the beam structure 24, and the second internal threaded hole 212a can be provided in this protruding structure to give the third portion 212b higher strength. Since the third portion 212b is correspondingly provided with the beam structure 24, and a second cavity 24a is formed inside the beam structure 24, the third portion 212b can protrude toward the beam structure 24, so that part of the structure of the third portion 212b can be located in the second cavity 24a, utilizing the space of the second cavity 24a to reduce the space occupied by the third portion 212b in the second direction Z.

[0407] In some embodiments, on the side of the second sub-bottom wall 212 away from the beam structure 24, the surface of the third portion 212b and the surface of the fourth portion 212c may be coplanar, so that the second sub-bottom wall 212 can be connected to the device body of the electrical device.

[0408] In the above scheme, the second cavity 24a of the beam structure 24 has an opening facing the second sub-bottom wall 212, and the beam structure 24 closes this opening. The orthographic projection of the third part 212b overlaps with the orthographic projection of the beam structure 24, and the thickness of the third part 212b is greater than the thickness of the fourth part 212c. The third part 212b protrudes along the second direction Z from the side of the fourth part 212c facing the cover 20b. The third part 212b can utilize the space of the second cavity 24a. The size of the third part 212b in the second direction Z is designed to be relatively large. The second internal threaded hole 212a is provided in the third part 212b. While satisfying the requirement that the size of the second internal threaded hole 212a in the second direction Z is relatively large, the size of the second internal threaded hole 212a protruding beyond the outer side of the second sub-bottom wall 212 along the second direction Z can be reduced. At the same time, the larger thickness of the third part 212b facilitates the improvement of the connection reliability between the battery device 100 and the device body of the power-consuming device.

[0409] Please refer to Figure 5 and Figure 17 According to some embodiments of this application, the beam structure 24 includes a fourth wall 241, a fifth wall 242, and a sixth wall 243. The fourth wall 241 and the fifth wall 242 are arranged opposite each other along a first direction X. One end of the fourth wall 241 is connected to the second sub-bottom wall 212, and one end of the fifth wall 242 is connected to the second sub-bottom wall 212. The sixth wall 243 connects the end of the fourth wall 241 away from the second sub-bottom wall 212 and the end of the fifth wall 242 away from the second sub-bottom wall 212. The fourth wall 241, the fifth wall 242, and the sixth wall 243 form a second cavity 24a. The second cavity 24a has an opening facing the second sub-bottom wall 212. The third part 212b of the second sub-bottom wall 212 closes the opening. The fourth wall 241 abuts against the battery cell assembly 10.

[0410] Please refer to Figure 5 and Figure 17 According to some embodiments of this application, the second sub-bottom wall 212 further includes a fifth part 212d. The fourth part 212c, the third part 212b and the fifth part 212d are distributed sequentially along the first direction X. The third part 212b connects the fourth part 212c and the fifth part 212d. On the same projection plane perpendicular to the second direction Z, the orthographic projection of the fifth part 212d does not overlap with the orthographic projection of the beam structure 24. The thickness of the third part 212b is greater than the thickness of the fifth part 212d. The second sidewall 23 is connected to the fifth part 212d.

[0411] Please refer to Figure 2According to some embodiments of this application, the cover 20b includes a top wall 25, a third side wall 26, and a fourth side wall 27. The top wall 25 and the bottom wall 21 are arranged opposite each other along the second direction Z, and the third side wall 26 and the fourth side wall 27 are arranged opposite each other along the third direction Y. The top wall 25 connects the third side wall 26 and the fourth side wall 27. The first side wall 22, the beam structure 24, and the second side wall 23 are located between the third side wall 26 and the fourth side wall 27. The third side wall 26 is connected to the first side wall 22, the second side wall 23, and the bottom wall 21. The fourth side wall 27 is connected to the first side wall 22, the second side wall 23, and the bottom wall 21. The top wall 25, the third side wall 26, the fourth side wall 27, the bottom wall 21, the first side wall 22, and the second side wall 23 form an accommodating space 20c, which is perpendicular to each other along the third direction Y, the second direction Z, and the first direction X.

[0412] The third sidewall 26 and the fourth sidewall 27 are spaced apart along the third direction Y. The first sidewall 22, the beam structure 24 and the second sidewall 23 are located between the third sidewall 26 and the fourth sidewall 27. The battery cell assembly 10 is disposed between the third side plate 73 and the fourth side plate. The third sidewall 26 and the fourth sidewall 27 are two side beams spaced apart along the third direction Y of the housing 20, so as to protect the battery cell assembly 10 along the third direction Y through the third sidewall 26 and the fourth sidewall 27.

[0413] The thickness direction of the third sidewall 26 can be parallel to the third direction Y. The third sidewall 26 can be plate-shaped. The surface of the third sidewall 26 facing the fourth sidewall 27 is connected to the first sidewall 22, the second sidewall 23 and the bottom wall 21, so that the connection structure between the third sidewall 26 and the box body 20a occupies less space in the third direction Y.

[0414] The thickness direction of the fourth sidewall 27 can be parallel to the third direction Y. The fourth sidewall 27 can be plate-shaped. The surface of the fourth sidewall 27 facing the third sidewall 26 is connected to the first sidewall 22, the second sidewall 23 and the bottom wall 21, so that the connection structure between the fourth sidewall 27 and the box body 20a occupies less space in the third direction Y.

[0415] The third sidewall 26, the top wall 25, and the fourth sidewall 27 can be integrally formed to give the cover 20b high overall strength. For example, the cover 20b can be integrally stamped or integrally injection molded.

[0416] In the above scheme, the cover 20b and the box body 20a can be U-shaped structures respectively. The cover 20b and the box body 20a are fastened together to form an accommodating space 20c, which can reduce the space occupied by the battery device 100 in the third direction Y and facilitate the improvement of the energy density of the battery device 100.

[0417] Please refer to Figure 2 and Figure 9In the embodiment where the cover 20b includes a top wall 25, a third side wall 26, and a fourth side wall 27, and the box body 20a includes a first side wall 22, a beam structure 24, a second side wall 23, a first sealing plate 31, and a second sealing plate 32, the third side wall 26 and the fourth side wall 27 are spaced apart along a third direction Y. The first sealing surface 20f can be the surface of the third side wall 26 facing the fourth side wall 27, and the second sealing surface 20g can be the surface of the fourth side wall 27 facing the third side wall 26. The first sealing plate 31 closes the first opening 22c, and the second sealing plate 32 closes the second opening 22d. The second sealing plate 32 is spaced apart along the third direction Y. The first sealing surface 20f is sealed to the surface of the first sealing plate 31 opposite to the second sealing plate 32. The first sealing surface 20f is sealed to the surface of the second side wall 23 opposite to the second sealing surface 20g. The second sealing surface 20g is sealed to the surface of the second sealing plate 32 opposite to the first sealing plate 31. The second sealing surface 20g is sealed to the surface of the second side wall 23 opposite to the first sealing surface 20f. The third side wall 26 and the fourth side wall 27 can both be flat, so that the space occupied by the cover 20b in the third direction Y is small.

[0418] Among them, the top wall 25 is sealed to the first side wall 22 to form a first sealing interface, the third side wall 26 is sealed to the first sealing plate 31 to form a second sealing interface, the third side wall 26 is sealed to the bottom wall 21 to form a third sealing interface, the third side wall 26 is sealed to the second side wall 23 to form a fourth sealing interface, the top wall 25 is sealed to the second side wall 23 to form a fifth sealing interface, the fourth side wall 27 is sealed to the second side wall 23 to form a sixth sealing interface, the fourth side wall 27 is sealed to the bottom wall 21 to form a seventh sealing interface, and the fourth side wall 27 is sealed to the second sealing plate 32 to form an eighth sealing interface. The first sealing interface, the second sealing interface, the third sealing interface, the fourth sealing interface, the fifth sealing interface, the sixth sealing interface, the seventh sealing interface, and the eighth sealing interface are connected end to end to form an annular sealing area P.

[0419] Please refer to Figure 13In the embodiment where the cover 20b includes a top wall 25, a first flange 28, and a second flange 29, and the box body 20a includes a first side wall 22, a second side wall 23, a beam structure 24, a first side plate 71, and a second side plate 72, the first flange 28 and the second flange 29 are spaced apart along a third direction Y, and the first side plate 71 and the second side plate 72 are spaced apart along a third direction Y. The first flange 28 is located on the side of the first side plate 71 facing away from the second side plate 72, and the second flange 29 is located on the side of the second side plate 72 facing away from the first side plate 72. On one side of 1, the first sealing surface 20f can be the surface of the first flange 28 facing the second flange 29, and the second sealing surface 20g can be the surface of the second flange 29 facing the first flange 28; the first sealing surface 20f is sealed to the surface of the first side plate 71 facing away from the second side plate 72, and the second sealing surface 20g is sealed to the surface of the second side plate 72 facing away from the first side plate 71. The first flange 28 and the second flange 29 can both be flat, so that the cover 20b occupies less space in the third direction Y.

[0420] Among them, the cover 20b is sealed to the first side wall 22 to form the ninth sealing interface, the first sealing surface 20f is sealed to the first side plate 71 to form the tenth sealing interface, the cover 20b is sealed to the second side wall 23 to form the eleventh sealing interface, the second sealing surface 20g is sealed to the second side plate 72 to form the twelfth sealing interface, and the ninth, tenth, eleventh and twelfth sealing interfaces are connected end to end to form an annular sealing area P.

[0421] Please refer to Figure 18 , Figure 18 This is a schematic diagram illustrating the assembly of the box body and the cover according to some embodiments of this application. According to some embodiments of this application, the box body 20a is provided with a glue groove 20d, and a sealant 20e is disposed within the glue groove 20d. The box body 20a and the cover 20b are sealed and bonded together by the sealant 20e.

[0422] The glue groove 20d is provided on the surface of the box body 20a for connection with the cover 20b. During the assembly process of the box body 20a and the cover 20b, the sealant 20e can be first placed in the glue groove 20d, and then the cover 20b and the box body 20a can be fastened together so that the box body 20a and the cover 20b are sealed and bonded by the sealant 20e.

[0423] In the above scheme, the setting of the glue groove 20d can accommodate the sealant 20e and play a role in positioning the sealant 20e; the box body 20a and the cover 20b are sealed and bonded by the sealant 20e, which facilitates operation and can save on locking parts and reduce manufacturing costs.

[0424] Please refer to Figure 2 and further refer to Figure 19 , Figure 19 This is a schematic diagram of the structure of the box body provided in some embodiments of this application. According to some embodiments of this application, the first sidewall 22 includes two first side surfaces 2201 disposed opposite each other along a third direction Y, and a second side surface 2202 facing the cover 20b along a second direction Z. A first transition surface 2203 is provided between the first side surfaces 2201 and the second side surface 2202, smoothly transitioning the first side surfaces 2201 and 2202. The cover 20b is connected to the first side surface 2201, the second side surface 2202, and the first transition surface 2203. 3. Connection; and / or, the second sidewall 23 includes two third side surfaces 2301 disposed opposite each other along the third direction Y and a fourth side surface 2302 facing the cover 20b along the second direction Z. A second transition surface 2303 is provided between the third side surface 2301 and the fourth side surface 2302. The second transition surface 2303 smoothly transitions the third side surface 2301 and the fourth side surface 2302. The cover 20b is connected to the third side surface 2301, the fourth side surface 2302 and the second transition surface 2303.

[0425] The first side surface 2201, the first transition surface 2203, and the second side surface 2202 are all outer peripheral surfaces of the first sidewall 22 and are used to connect with the cover 20b.

[0426] The first transition surface 2203 connects the first side surface 2201 and the second side surface 2202. The first transition surface 2203 is used to achieve a smooth transition between the first side surface 2201 and the second side surface 2202. The first transition surface 2203 can be an arc surface.

[0427] In some embodiments, the plane containing the first side surface 2201 may be perpendicular to the plane containing the second side surface 2202.

[0428] The third side surface 2301, the second transition surface 2303, and the fourth side surface 2302 are all outer peripheral surfaces of the second sidewall 23 and are used to connect with the cover 20b.

[0429] The second transition surface 2303 connects the third side surface 2301 and the fourth side surface 2302. The second transition surface 2303 is used to achieve a smooth transition between the third side surface 2301 and the fourth side surface 2302. The second transition surface 2303 can be an arc surface.

[0430] In some embodiments, the plane containing the third side surface 2301 may be perpendicular to the plane containing the fourth side surface 2302.

[0431] In the above scheme, the first transition surface 2203 smoothly transitions the first side surface 2201 and the second side surface 2202. The cover 20b is connected to the first side surface 2201, the second side surface 2202, and the first transition surface 2203, which facilitates increasing the connection area between the cover 20b and the first side wall 22, thereby ensuring a high connection reliability between the cover 20b and the first side wall 22. The second transition surface 2303 smoothly transitions the third side surface 2301 and the fourth side surface 2302. The cover 20b is connected to the third side surface 2301, the fourth side surface 2302, and the second transition surface 2303, which facilitates increasing the connection area between the cover 20b and the second side wall 23, thereby ensuring a high connection reliability between the cover 20b and the second side wall 23.

[0432] Please refer to Figure 2 and further refer to Figure 20 and Figure 21 , Figure 20 This is a schematic diagram illustrating the assembly of the fourth connecting portion with the first sidewall, provided in some embodiments of this application. Figure 21 This is a schematic diagram illustrating the assembly of the fifth connecting portion and the second sidewall according to some embodiments of this application. According to some embodiments of this application, the cover 20b includes a fourth connecting portion 233 and a fifth connecting portion 234 located at both ends along a first direction X. The fourth connecting portion 233 and the fifth connecting portion 234 are respectively used to connect the first sidewall 22 and the second sidewall 23. The fourth connecting portion 233 includes two first inner sealing surfaces 233a disposed opposite each other along a third direction Y, and a second inner sealing surface 233b facing the bottom wall 21 along a second direction Z. A first transition sealing surface 233c is disposed between the first inner sealing surfaces 233a and the second inner sealing surfaces 233b, smoothly transitioning between the first inner sealing surfaces 233a and the second inner sealing surfaces 233b. The first inner sealing surface 233a is connected to the first side surface 2201, and the second inner sealing surface 233b... The cover 233b is connected to the second side surface 2202, and the first transition sealing surface 233c is connected to the first transition surface 2203; the fifth connecting part 234 includes two third inner sealing surfaces 234a arranged opposite each other along the third third direction Y, and a fourth inner sealing surface 234b facing the bottom wall 21 along the second direction Z. A second transition sealing surface 234c is provided between the third inner sealing surface 234a and the fourth inner sealing surface 234b. The second transition sealing surface 234c smoothly transitions between the third inner sealing surface 234a and the fourth inner sealing surface 234b. The third inner sealing surface 234a is connected to the third side surface 2301, the fourth inner sealing surface 234b is connected to the fourth side surface 2302, and the second transition sealing surface 234c is connected to the second transition surface 2303.

[0433] The fourth connecting part 233 and the fifth connecting part 234 are located at both ends of the cover 20b along the first direction X, respectively. The fourth connecting part 233 is connected to the first side wall 22, and the fifth connecting part 234 is connected to the second side wall 23.

[0434] Two first inner sealing surfaces 233a are arranged opposite each other along the third direction Y, and the first side wall 22 is located between the two first inner sealing surfaces 233a. The first inner sealing surfaces 233a are sealed to the first side surface 2201.

[0435] The second inner sealing surface 233b is disposed facing the second side surface 2202, and the second inner sealing surface 233b is sealed to the second side surface 2202.

[0436] The first transition sealing surface 233c connects the first inner sealing surface 233a and the second inner sealing surface 233b. The first transition sealing surface 233c is used to achieve a smooth transition between the first inner sealing surface 233a and the second inner sealing surface 233b. The first transition sealing surface 233c can be an arc surface.

[0437] The first transition sealing surface 233c is sealed to the first transition surface 2203.

[0438] Two third inner sealing surfaces 234a are arranged opposite each other along the third direction Y, and the second side wall 23 is located between the two third inner sealing surfaces 234a. The third inner sealing surfaces 234a are sealed to the third side surface 2301.

[0439] The fourth inner sealing surface 234b is disposed facing the fourth side surface 2302, and the fourth inner sealing surface 234b is sealed to the fourth side surface 2302.

[0440] The second transition sealing surface 234c connects the third inner sealing surface 234a and the fourth inner sealing surface 234b. The second transition sealing surface 234c is used to achieve a smooth transition between the third inner sealing surface 234a and the fourth inner sealing surface 234b. The second transition sealing surface 234c can be an arc surface.

[0441] The second transition sealing surface 234c is sealed to the second transition surface 2303.

[0442] In the above scheme, the first transition sealing surface 233c smoothly transitions to the first inner sealing surface 233a and the second inner sealing surface 233b. The first transition sealing surface 233c is correspondingly set to the first transition surface 2203. The contour of the cover 20b matches the contour of the first side wall 22, which facilitates improving the reliability of the sealing connection between the cover 20b and the first side wall 22. The second transition sealing surface 234c smoothly transitions to the third inner sealing surface 234a and the fourth inner sealing surface 234b. The second transition sealing surface 234c is correspondingly set to the second transition surface 2303. The contour of the cover 20b matches the contour of the second side wall 23, which facilitates improving the reliability of the sealing connection between the cover 20b and the second side wall 23.

[0443] Please refer to Figure 19 According to some embodiments of this application, when a first transition surface 2203 is provided between the first side surface 2201 and the second side surface 2202, the first side surface 2201 is provided with a first adhesive groove 220a, the second side surface 2202 is provided with a second adhesive groove 220b, and the first transition surface 2203 is provided with a third adhesive groove 220c, the maximum depth of the third adhesive groove 220c being greater than the maximum depth of at least one of the first adhesive groove 220a and the second adhesive groove 220b; and / or, when a second transition surface 2303 is provided between the third side surface 2301 and the fourth side surface 2302, the third side surface 2301 is provided with a fourth adhesive groove 230a, the fourth side surface 2302 is provided with a fifth adhesive groove 230b, and the second transition surface 2303 is provided with a sixth adhesive groove 230c, the maximum depth of the sixth adhesive groove 230c being greater than the maximum depth of at least one of the fourth adhesive groove 230a and the fifth adhesive groove 230b.

[0444] The third adhesive groove 220c connects the first adhesive groove 220a and the second adhesive groove 220b, so that the sealant is continuously distributed on the first side surface 2201, the first transition surface 2203 and the second side surface 2202, which facilitates the formation of a continuous sealing interface between the cover 20b and the first side wall 22.

[0445] The width of the third adhesive groove 220c can be equal to the width of the first adhesive groove 220a and the width of the second adhesive groove 220b, so as to form a sealing interface of equal width between the cover 20b and the first side wall 22.

[0446] Among the first adhesive groove 220a, the second adhesive groove 220b and the third adhesive groove 220c, the maximum depth of the third adhesive groove 220c is greater than that of the other two, which allows more sealant to be placed in the third adhesive groove 220c.

[0447] The sixth adhesive groove 230c connects the fourth adhesive groove 230a and the fifth adhesive groove 230b, so that the sealant is continuously distributed on the third side surface 2301, the second transition surface 2303 and the fourth side surface 2302, which facilitates the formation of a continuous sealing interface between the cover 20b and the second side wall 23.

[0448] The width of the sixth adhesive groove 230c can be equal to the width of the fourth adhesive groove 230a and the fifth adhesive groove 230b, so as to form a sealing interface of equal width between the cover 20b and the second side wall 23.

[0449] Among the fourth adhesive groove 230a, the fifth adhesive groove 230b and the sixth adhesive groove 230c, the maximum depth of the sixth adhesive groove 230c is greater than that of the other two, which allows more sealant to be placed in the sixth adhesive groove 230c.

[0450] In the above scheme, the maximum depth of the third adhesive groove 220c is greater than the maximum depth of at least one of the first adhesive groove 220a and the second adhesive groove 220b, so that the third adhesive groove 220c can hold more sealant, which facilitates the improvement of the sealing connection reliability between the first transition surface 2203 and the first transition sealing surface 233c; the maximum depth of the sixth adhesive groove 230c is greater than the maximum depth of at least one of the fourth adhesive groove 230a and the fifth adhesive groove 230b, so that the sixth adhesive groove 230c can hold more sealant, which facilitates the improvement of the sealing connection reliability between the second transition surface 2303 and the second transition sealing surface 234c.

[0451] Please refer to Figure 22 , Figure 22 This is a schematic diagram illustrating the assembly of the cover with the first sidewall and the second sidewall according to some embodiments of this application. According to some embodiments of this application, the battery device 100 further includes a first fastener 101 and a second fastener 102. The first fastener 101 connects the first sidewall 22 to the cover 20b, and the second fastener 102 connects the second sidewall 23 to the cover 20b. The first sidewall 22 has a first locking hole 220 for securing the first fastener 101, and the second sidewall 23 has a second locking hole 230 for securing the second fastener 102. The cover 20b has a fourth through hole 104 corresponding to the first locking hole 220 and a fifth through hole 105 corresponding to the second locking hole 230. The first fastener 101 passes through the fourth through hole 104 and is secured to the first locking hole 220, and the second fastener 102 passes through the fifth through hole 105 and is secured to the second locking hole 230. At least one of the fourth through hole 104 and the fifth through hole 105 is a slotted hole.

[0452] In some embodiments, the first fastener 101 and the second fastener 102 may be components with external threads, or the first fastener 101 and the second fastener 102 may also be rivets.

[0453] A waist hole is a type of hole commonly used for mechanical connections or fixing components. It is usually an oblong structure with semicircular ends and a rectangular middle section, similar to a "keyhole" or "racetrack".

[0454] During the assembly of the cover 20b and the first sidewall 22, the first fastener 101 passes through the cover 20b via the fourth through hole 104 and engages with the first locking hole 220 to lock the cover 20b to the first sidewall 22.

[0455] During the assembly of the cover 20b and the second sidewall 23, the second fastener 102 passes through the fifth through hole 105 through the cover 20b and engages with the second locking hole 230 to lock the cover 20b to the second sidewall 23.

[0456] In the above scheme, at least one of the fourth through hole 104 and the fifth through hole 105 is a waist hole. When the first sidewall 22 undergoes slight deformation due to the expansion force applied by the battery cell assembly 10, the fourth through hole 104 or the fifth through hole 105 on the cover 20b can adapt to the locking position movement of the first fastener 101 or the second fastener 102, which can reduce the probability of cracking of the cover 20b and make the cover 20b and the first sidewall 22 and the second sidewall 23 have high sealing connection reliability.

[0457] Please refer to Figure 23 , Figure 23 This is a schematic diagram of the assembly of the cover and the bottom wall provided in some embodiments of this application. According to some embodiments of this application, the bottom wall 21 is provided with locking cavities M at both ends along the third direction Y. The battery device 100 also includes a third fastener 103, which is used to connect the cover 20b to the bottom wall 21. At least a portion of the third fastener 103 is locked into the locking cavity M. The bottom wall 21 is provided with a flow channel cavity N, which is separated from the locking cavity M. The third direction Y is perpendicular to the first direction X and the second direction Z.

[0458] The locking cavity M is a cavity for the third fastener 103 to pass through. When the third fastener 103 locks the cover 20b to the bottom wall 21, at least a portion of the third fastener 103 is locked into the locking cavity M.

[0459] The flow channel cavity N is the cavity that constitutes the flow channel, and the flow channel cavity N is used to contain the heat exchange medium.

[0460] In some embodiments, the flow channel cavity N and the locking cavity M are spaced apart along the third direction Y.

[0461] In the above scheme, the locking cavity M is convenient to accommodate the third fastener 103 so that the cover 20b and the bottom wall 21 can be locked together by the third fastener 103. The flow channel cavity N is used to accommodate the heat exchange medium. The locking cavity M and the flow channel cavity N are separated, which can reduce the risk of heat exchange medium leakage.

[0462] Please refer to Figure 24 , Figure 24 This is a schematic diagram of the structure of the second sidewall provided in some embodiments of this application. According to some embodiments of this application, the second sidewall 23 includes a frame 231 and an inspection plate 232. The frame 231 is connected to the bottom wall 21. The frame 231 is provided with an inspection window 231a, which penetrates the frame 231 along a first direction X. The inspection plate 232 is detachably connected to the frame 231 and closes the inspection window 231a.

[0463] The frame 231 and the inspection plate 232 are two components that constitute the second side wall 23. The frame 231 is used to connect with the bottom wall 21. The frame 231 is provided with an inspection window 231a. The inspection plate 232 is detachably connected to the frame 231 so as to facilitate the removal of the inspection plate 232 and the inspection and replacement of the components located between the beam structure 24 and the second side wall 23.

[0464] The frame 231 can be rectangular and can be welded to the bottom wall 21 to ensure a firm connection between them. The connection between the inspection plate 232 and the frame 231 can be varied, such as snap-fit ​​connection or threaded connection.

[0465] In some embodiments, the frame 231 may be provided with threaded holes, and the inspection plate 232 may be provided with through holes. The inspection plate 232 and the frame 231 may be connected by bolts passing through the through holes and threaded holes. The inspection plate 232 and the frame 231 are firmly connected and easy to assemble and disassemble.

[0466] In some embodiments, the inspection plate 232 may be provided with pipe joints, electrical component joints, etc., to facilitate the connection between internal components of the battery device 100 and external components.

[0467] In the above solution, the frame 231 is provided with a maintenance window 231a, and the maintenance plate 232 is detachably connected to the frame 231. When the cover 20b is disassembled, only the maintenance plate 232 needs to be removed to maintain the components inside the box 20, which can improve maintenance efficiency.

[0468] Please refer to Figure 25 , Figure 25This is a schematic diagram of the assembly of the bottom wall and the hoisting structure provided in some embodiments of this application. According to some embodiments of this application, the battery device 100 further includes a hoisting structure 110, which is disposed on the side wall surface of the bottom wall 21 along the third direction Y, and the third direction Y is perpendicular to the first direction X and the second direction Z.

[0469] The lifting structure 110 can be a structure for cooperating with lifting equipment. For example, the lifting structure 110 can be provided with a lifting hole for cooperating with the hook of the lifting equipment to facilitate the lifting of the battery device 100.

[0470] To ensure the stable hoisting of the battery device 100, four hoisting structures 110 can be provided. The four hoisting structures 110 are distributed circumferentially at intervals on the bottom wall 21 to share the force provided by the hoisting equipment.

[0471] In the above scheme, by setting a hoisting structure 110 on the side wall of the bottom wall 21 along the third direction Y, the hoisting and transportation of the battery device 100 can be facilitated, and the transportation convenience can be improved.

[0472] According to some embodiments of this application, this application also provides an electrical device that includes a battery device 100 provided according to any of the above embodiments.

[0473] The power supply device can be any of the above-mentioned devices or equipment that use the battery device 100 as a power source.

[0474] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes a plurality of battery cells stacked along a first direction; The housing body includes a bottom wall, a first side wall, a second side wall, and a beam structure. The bottom wall supports the battery cell assembly along a second direction. The first side wall, the second side wall, and the beam structure are all connected to the side of the bottom wall facing the battery cell assembly. The first side wall, the beam structure, and the second side wall are arranged sequentially at intervals along the first direction. The battery cell assembly is located between the first side wall and the beam structure. Both ends of the battery cell assembly abut against the first side wall and the beam structure, respectively. The second direction is perpendicular to the first direction. The cover is connected to the first side wall and the second side wall, and the cover and the box body enclose a receiving space, and the battery cell assembly is disposed in the receiving space; The cover and the box body are sealed together to form an annular sealing area. The bottom wall is provided with a mounting part. On the same projection plane perpendicular to the second direction, the orthographic projections of all the mounting parts are located within the space enclosed by the orthographic projections of the sealing area. The mounting part is used to connect to the device body of the electrical device.

2. The battery device according to claim 1, characterized in that, The cover includes a first sealing surface and a second sealing surface spaced apart along a third direction. Along the third direction, the box body is located between the first sealing surface and the second sealing surface. The first sealing surface is sealed to the box body, and the second sealing surface is sealed to the box body. Both the first sealing surface and the second sealing surface intersect with the third direction. On the same projection plane perpendicular to the second direction, along the third direction, the orthographic projections of all the mounting parts are located between the orthographic projections of the first sealing surface and the second sealing surface, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery device according to claim 1, characterized in that, At least one of the first sidewall and the beam structure is integrally formed with at least a portion of the bottom wall.

4. The battery device according to claim 3, characterized in that, The bottom wall includes a first sub-bottom wall and a second sub-bottom wall that are connected to each other, the first side wall is connected to the first sub-bottom wall, and the beam structure is connected to the second sub-bottom wall; The first sidewall is integrally formed with the first sub-bottom wall, and / or the beam structure is integrally formed with the second sub-bottom wall.

5. The battery device according to claim 4, characterized in that, The bottom wall further includes a third sub-bottom wall, and the first sub-bottom wall, the third sub-bottom wall and the second sub-bottom wall are arranged sequentially along the first direction, and the third sub-bottom wall connects the first sub-bottom wall and the second sub-bottom wall; The interior of the third sub-bottom wall has a flow channel for containing the heat exchange medium.

6. The battery device according to claim 5, characterized in that, The third sub-bottom wall includes a bottom wall body and a protrusion, the protrusion protruding from the bottom wall body on the side close to the second sub-bottom wall; The second sub-bottom wall has a first groove on the side near the third sub-bottom wall, and at least a portion of the protrusion is disposed in the first groove.

7. The battery device according to claim 6, characterized in that, The protrusion is provided with a flow channel inlet and a flow channel outlet. The flow channel inlet is connected to the flow channel, and the flow channel outlet is connected to the flow channel. On the same projection plane perpendicular to the second direction, along the first direction, the orthographic projection of the flow channel inlet and the orthographic projection of the flow channel outlet are located between the orthographic projection of the beam structure and the orthographic projection of the second sidewall.

8. The battery device according to claim 7, characterized in that, The number of protrusions is two, and the two protrusions are spaced apart along a third direction. The flow channel inlet is located on one of the protrusions, and the flow channel outlet is located on the other protrusion. The number of the first grooves is two, and the two first grooves are spaced apart along the third direction. One protrusion is disposed in one of the first grooves. The third direction, the second direction and the first direction are perpendicular to each other.

9. The battery device according to claim 7, characterized in that, The battery device further includes a first connector and a second connector, the first connector and the second connector being respectively disposed on the second side wall; The battery device further includes a first connecting pipe and a second connecting pipe, both of which are disposed between the beam structure and the second sidewall. The first connecting pipe connects the flow channel inlet and the first connector, and the second connecting pipe connects the flow channel outlet and the second connector.

10. The battery device according to claim 5, characterized in that, The first sub-bottom wall is welded to the third sub-bottom wall, and the second sub-bottom wall is welded to the third sub-bottom wall.

11. The battery device according to claim 10, characterized in that, The first sub-bottom wall is connected to the third sub-bottom wall by friction stir welding, and the second sub-bottom wall is connected to the third sub-bottom wall by friction stir welding.

12. The battery device according to claim 4, characterized in that, The battery device also includes a third direction, which is perpendicular to both the first direction and the second direction. The first sidewall and the first sub-bottom wall are integrally extruded along the third direction, and the interior of the first sidewall has a first cavity extending along the third direction and penetrating both ends; and / or, The beam structure and the second sub-bottom wall are integrally extruded along the third direction, and a second cavity is formed inside the beam structure that extends along the third direction and passes through both ends.

13. The battery device according to claim 12, characterized in that, The first cavity extends through the third direction so that the first sidewall forms a first opening and a second opening at its two ends in the third direction, respectively. The box body also includes a first sealing plate and a second sealing plate. The first sealing plate is connected to the first side wall and closes the first opening. The second sealing plate is connected to the first side wall and closes the second opening. The cover is at least partially used for sealing cooperation with the first sealing plate and the second sealing plate.

14. The battery device according to claim 13, characterized in that, The cover includes a top wall, a third side wall, and a fourth side wall. The top wall and the bottom wall are arranged opposite to each other along the second direction, and the third side wall and the fourth side wall are arranged opposite to each other along the third direction. The top wall connects the third side wall and the fourth side wall. The third sidewall is located on the side of the first sealing plate opposite to the second sealing plate, and the third sidewall is connected to the first sealing plate; The fourth sidewall is located on the side of the second sealing plate opposite to the first sealing plate, and the fourth sidewall is connected to the second sealing plate.

15. The battery device according to claim 1, characterized in that, The box body also includes a tensioning member, the two ends of which are respectively connected to the first side wall and the beam structure.

16. The battery device according to claim 15, characterized in that, Along the second direction, the tensioning member is located on the side of the battery cell assembly opposite to the bottom wall.

17. The battery device according to claim 16, characterized in that, The first sidewall is provided with a first surface and a second surface at one end away from the bottom wall, and the first surface is recessed relative to the second surface in a direction closer to the bottom wall; Along the first direction, the first surface is closer to the battery cell assembly than the second surface, the tensioner is connected to the first surface, and the cover is sealed to the second surface.

18. The battery device according to claim 17, characterized in that, The battery cell includes a housing and two electrode terminals. The housing includes a first wall, and the two electrode terminals are spaced apart on the first wall along a third direction. The first wall includes a shoulder region located outside the two electrode terminals along the third direction. The tensioning member is disposed in the shoulder region. The third direction, the second direction, and the first direction are perpendicular to each other.

19. The battery device according to claim 18, characterized in that, The tensioner is attached to the shoulder area.

20. The battery device according to claim 19, characterized in that, The tensioning member includes a base and an insulating member. The base is a metal part, and the insulating member has a receiving groove. At least a portion of the base is received in the receiving groove. The insulating member is located between the base and the battery cell and is bonded to the shoulder area.

21. The battery device according to claim 18, characterized in that, The battery cell assembly includes a first battery cell assembly and a second battery cell assembly, the first battery cell assembly and the second battery cell assembly are arranged along the third direction, and both the first battery cell assembly and the second battery cell assembly include a plurality of battery cells stacked along the first direction. The battery cells in the first battery cell assembly have a first shoulder region adjacent to the second battery cell assembly, and the battery cells in the second battery cell assembly have a second shoulder region adjacent to the first battery cell assembly. The tensioning member includes a first tensioning member disposed in at least one of the first shoulder region and the second shoulder region.

22. The battery device according to claim 21, characterized in that, The first tensioning member has a first end that is connected to the first sidewall; The battery device further includes a first busbar, which is configured to avoid the first end and electrically connect the first battery cell assembly and the second battery cell assembly.

23. The battery device according to claim 22, characterized in that, The first surface is provided with a second groove, and along the first direction, the second groove is located between the first end and the second surface; The first busbar component includes a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion is electrically connected to the first battery cell assembly, the second connecting portion is electrically connected to the second battery cell assembly, and the third connecting portion connects the first connecting portion and the second connecting portion. At least a portion of the third connecting portion is located within the second groove.

24. The battery device according to claim 21, characterized in that, The first tensioning member has a first end connected to the first sidewall; the battery device further includes a first busbar for electrically connecting the first battery cell assembly and the second battery cell assembly; Along the second direction, the first end is located on the side of the first busbar component away from the battery cell assembly, and an insulating component is provided between the first end and the first busbar component, and / or an elastic component is provided between the first end and the first busbar component.

25. The battery device according to claim 15, characterized in that, The tensioning member further includes a first side plate and a second side plate disposed opposite to each other along a third direction, wherein the first side plate and the second side plate are respectively located on both sides of the battery cell assembly along the third direction; The first side plate is connected to the first side wall and the second side wall at both ends, and the first side plate is connected to the beam structure. The two ends of the second side plate are respectively connected to the first side wall and the second side wall, and the second side plate is connected to the beam structure; The third direction, the second direction, and the first direction are all perpendicular to each other.

26. The battery device according to claim 25, characterized in that, The first sidewall has a first cavity inside, and the first sidewall has a first opening and a second opening at its two ends in the third direction, respectively, and both the first opening and the second opening are in communication with the first cavity. The beam structure has a second cavity inside, and the beam structure has a third opening and a fourth opening at both ends in the third direction, respectively, and the third opening and the fourth opening are connected to the second cavity. The first side plate closes the first opening and the third opening; The second side plate closes the second opening and the fourth opening.

27. The battery device according to claim 26, characterized in that, The first side plate is provided with a first insert and a second insert on the side facing the second side plate, at least a portion of the first insert is embedded in the first opening, and at least a portion of the second insert is embedded in the third opening; The second side plate has a third insert and a fourth insert on the side facing the first side plate, at least a portion of the third insert is embedded in the second opening, and at least a portion of the fourth insert is embedded in the fourth opening.

28. The battery device according to claim 25, characterized in that, The first side plate includes a plurality of first sub-side plates, which are distributed sequentially along the first direction, and adjacent first sub-side plates are connected to each other. The second side plate includes a plurality of second sub-side plates, which are distributed sequentially along the first direction, and adjacent second sub-side plates are connected to each other.

29. The battery device according to claim 28, characterized in that, The two adjacent first sub-side plates are connected by mortise and tenon joints, and the two adjacent second sub-side plates are connected by mortise and tenon joints.

30. The battery device according to claim 25, characterized in that, The battery cell assembly includes a first battery cell assembly and a second battery cell assembly, and the first battery cell assembly and the second battery cell assembly are arranged along the third direction; The tensioning member also includes a third side plate, which is located between the first battery cell assembly and the second battery cell assembly along the third direction. The third side plate connects the first side wall and the beam structure.

31. The battery device according to claim 30, characterized in that, The first sidewall is provided with a first through hole, which penetrates the first sidewall along the first direction; The beam structure is provided with a second through hole, which penetrates the beam structure along the first direction; The third side plate passes through the first through hole and the second through hole.

32. The battery device according to claim 31, characterized in that, A fifth insert is provided at one end of the third side plate, and a third groove is provided on the side of the first side wall opposite to the battery cell assembly. The third groove communicates with the first through hole, and at least a portion of the fifth insert is embedded in the third groove.

33. The battery device according to claim 30, characterized in that, The third side plate includes multiple third sub-side plates, which are distributed sequentially along the first direction, and adjacent third sub-side plates are connected to each other.

34. The battery device according to claim 33, characterized in that, The two adjacent third sub-side plates are connected by mortise and tenon joints.

35. The battery device according to claim 25, characterized in that, The cover is connected to the first side wall, the second side wall, the first side plate, and the second side plate, and the cover, the bottom wall, the first side wall, the second side wall, the first side plate, and the second side plate form the accommodating space.

36. The battery device according to claim 35, characterized in that, The cover includes a top wall, a first flange and a second flange. The first flange and the second flange are formed at both ends of the top wall in the third direction. Both the first flange and the second flange extend toward the bottom wall. The first flange is connected to the first side plate, the first side wall and the second side wall. The second flange is connected to the second side plate, the first side wall and the second side wall.

37. The battery device according to claim 1, characterized in that, The bottom wall includes a first region, which is a solid region, and the mounting part includes an internally threaded hole located in the first region, the internally threaded hole extending along the second direction and having an opening located on the outer surface of the bottom wall.

38. The battery device according to claim 1, characterized in that, The bottom wall includes a first region, at least partially having a cavity structure. The mounting part includes an insert with an internal threaded hole embedded in the cavity structure. The outer surface of the bottom wall has a third through hole that communicates with the internal threaded hole.

39. The battery device according to claim 37, characterized in that, Along the second direction, the area of ​​the bottom wall corresponding to the first side wall and the beam structure is the first region.

40. The battery device according to claim 1, characterized in that, The cover includes a top wall, a third side wall, and a fourth side wall. The top wall and the bottom wall are arranged opposite each other along the second direction, and the third side wall and the fourth side wall are arranged opposite each other along the third direction. The top wall connects the third side wall and the fourth side wall. The first side wall, the beam structure, and the second side wall are located between the third side wall and the fourth side wall. The third side wall is connected to the first side wall, the second side wall, and the bottom wall. The fourth side wall is connected to the first side wall, the second side wall, and the bottom wall. The top wall, the third side wall, the fourth side wall, the bottom wall, the first side wall, and the second side wall enclose the receiving space. The third direction, the second direction, and the first direction are perpendicular to each other.

41. The battery device according to claim 40, characterized in that, The box body is provided with a glue groove, and the glue groove is filled with sealant. The box body and the cover are sealed and bonded together by the sealant.

42. The battery device according to claim 41, characterized in that, The first sidewall includes two first side surfaces disposed opposite each other along the third direction and a second side surface facing the cover along the second direction. A first transition surface is provided between the first side surface and the second side surface, and the first transition surface smoothly transitions between the first side surface and the second side surface. The cover is connected to the first side surface, the second side surface and the first transition surface. And / or, The second sidewall includes two third side surfaces disposed opposite each other along the third direction and a fourth side surface facing the cover along the second direction. A second transition surface is provided between the third side surface and the fourth side surface, and the second transition surface smoothly transitions between the third side surface and the fourth side surface. The cover is connected to the third side surface, the fourth side surface and the second transition surface.

43. The battery device according to claim 42, characterized in that, The cover includes a fourth connecting portion and a fifth connecting portion located at both ends along the first direction, the fourth connecting portion and the fifth connecting portion being used to connect the first sidewall and the second sidewall, respectively; The fourth connecting part includes two first inner sealing surfaces disposed opposite each other along the third direction, and a second inner sealing surface facing the bottom wall along the second direction. A first transition sealing surface is disposed between the first inner sealing surface and the second inner sealing surface. The first transition sealing surface smoothly transitions between the first inner sealing surface and the second inner sealing surface. The first inner sealing surface is connected to the first side surface, the second inner sealing surface is connected to the second side surface, and the first transition sealing surface is connected to the first transition surface. The fifth connecting portion includes two third inner sealing surfaces disposed opposite each other along the third direction, and a fourth inner sealing surface facing the bottom wall along the second direction. A second transition sealing surface is disposed between the third inner sealing surface and the fourth inner sealing surface. The second transition sealing surface smoothly transitions between the third inner sealing surface and the fourth inner sealing surface. The third inner sealing surface is connected to the third side surface, the fourth inner sealing surface is connected to the fourth side surface, and the second transition sealing surface is connected to the second transition surface.

44. The battery device according to claim 42, characterized in that, When a first transition surface is provided between the first side surface and the second side surface, the first side surface is provided with a first adhesive groove, the second side surface is provided with a second adhesive groove, and the first transition surface is provided with a third adhesive groove, wherein the maximum depth of the third adhesive groove is greater than the maximum depth of at least one of the first adhesive groove and the second adhesive groove; and / or, When a second transition surface is provided between the third side surface and the fourth side surface, a fourth adhesive groove is provided on the third side surface, a fifth adhesive groove is provided on the fourth side surface, and a sixth adhesive groove is provided on the second transition surface. The maximum depth of the sixth adhesive groove is greater than the maximum depth of at least one of the fourth and fifth adhesive grooves.

45. The battery device according to claim 1, characterized in that, The battery device further includes a first fastener and a second fastener. The first fastener is used to connect the first sidewall to the cover, and the second fastener is used to connect the second sidewall to the cover. The first sidewall is provided with a first locking hole for locking the first fastener, and the second sidewall is provided with a second locking hole for locking the second fastener. The cover is provided with a fourth through hole corresponding to the first locking hole and a fifth through hole corresponding to the second locking hole. The first fastener passes through the fourth through hole and is locked with the first locking hole, and the second fastener passes through the fifth through hole and is locked with the second locking hole. At least one of the fourth through hole and the fifth through hole is a waist hole.

46. ​​The battery device according to claim 1, characterized in that, The bottom wall is provided with locking cavities at both ends along a third direction. The battery device also includes a third fastener for connecting the cover to the bottom wall. At least a portion of the third fastener is locked into the locking cavity. The bottom wall is provided with a flow channel cavity, which is separated from the locking cavity. The third direction is perpendicular to both the first direction and the second direction.

47. The battery device according to claim 1, characterized in that, The second sidewall includes a frame and an inspection plate. The frame is connected to the bottom wall. The frame is provided with an inspection window that extends through the frame along the first direction. The inspection plate is detachably connected to the frame and closes the inspection window.

48. The battery device according to any one of claims 1-47, characterized in that, The battery device also includes a hoisting structure, which is disposed on the side wall of the bottom wall along a third direction, and the third direction is perpendicular to both the first direction and the second direction.

49. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-47.

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