Battery device and electric device

Abstract

The application provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer, a first box body and a second box body. The first box body is provided with a mounting structure, and comprises a bearing plate and a first side wall plate. The bearing plate has a bearing surface for supporting the battery monomer in a first direction, and the first side wall plate is connected to the bearing plate and protrudes from the bearing surface. The second box body comprises a top plate and a second side wall plate, and the second side wall plate is connected to the first side wall plate and the top plate. In the first direction, the size of the first side wall plate protruding from the bearing surface is less than one fourth of the maximum size of the second side wall plate. A first sealing element is arranged between the first side wall plate and the second side wall plate, and the battery device further comprises a first locking element penetrating the first sealing element and locking the first side wall plate and the second side wall plate. The first sealing element can play a buffering role between the first side wall plate and the second side wall plate, so as to reduce the stress influence on the top plate.

Description

Technical Field

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

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

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

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

[0005] In a first aspect, embodiments of this application provide a battery device, including a battery cell, a first housing body, and a second housing body. The first housing body is provided with a mounting structure, and includes a support plate and a first side wall plate. The support plate has a support surface on one side in a first direction, and the support surface is used to support the battery cell along the first direction. The first side wall plate is connected to the support plate and protrudes from the support surface. The second housing body and the first housing body together define an assembly space for accommodating the battery cell. The second housing body includes a top plate and a second side wall plate. The top plate and the support plate are disposed opposite to each other along the first direction. One end of the second side wall plate is connected to the top plate in the first direction. Along the first direction, the dimension of the first side wall plate protruding from the support surface is less than one-quarter of the maximum dimension of the second side wall plate. The first side wall plate and the second side wall plate do not contact each other, and a first sealing member is sandwiched between the first side wall plate and the second side wall plate. The battery device also includes a first locking member, which passes through the first sealing member and locks the first side wall plate and the second side wall plate.

[0006] In the above technical solution, the battery device includes a first housing body and a second housing body. The first side wall of the first housing body and the second side wall of the second housing body are connected to each other. The first housing body is provided with a mounting structure for assembly and connection with a target component, so that the support plate of the first housing body supports and carries the battery cells, and facilitates the assembly of the battery device onto the target component for power supply. By making the dimension of the first side wall protruding from the support surface less than one-quarter of the maximum dimension of the second side wall, the size of the first side wall for assembly and connection with the second housing body is smaller. This optimizes the dimensions of the first housing body in the first direction and reduces the binding force of the first housing body on the second housing body, thereby reducing the assembly difficulty between the first housing body and the target component, and reducing the difficulty of assembling the battery cells onto the support plate, thus reducing the assembly difficulty of the battery device. The first side wall and the second side wall do not contact each other, and a mounting structure is sandwiched between the first side wall and the second side wall. The first sealing element allows the first side wall panel and the second side wall panel to indirectly abut against each other. The first locking element passes through the first sealing element and connects the first side wall panel and the second side wall panel, thus locking the first side wall panel and the second side wall panel to the first sealing element. This allows the first side wall panel and the second side wall panel to be assembled and connected, while also providing a buffering and separating effect between them. The first sealing element can absorb and release stress generated by deformation of the first housing body during use, reducing the stress transmitted from the first side wall panel of the first housing body to the second side wall panel of the second housing body. This reduces the stress on the top plate of the second housing body, mitigating deformation or bulging during use, extending the battery device's lifespan, reducing safety hazards during use, and improving the battery device's lifespan and reliability.

[0007] In some embodiments, the thickness of the first seal is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0008] In the above technical solution, on the one hand, setting the thickness of the first sealing element to be greater than or equal to 0.5 mm can improve the relative floating size of the first side wall plate and the second side wall plate, thereby improving both the sealing effect of the first sealing element on the gap between the first side wall plate and the second side wall plate and the buffering effect of the first sealing element between the first side wall plate and the second side wall plate. On the other hand, setting the thickness of the first sealing element to be less than or equal to 5 mm can alleviate the phenomenon that the first sealing element occupies too much space between the first side wall plate and the second side wall plate, thereby improving the volumetric energy density of the battery device and optimizing the gap size between the first side wall plate and the second side wall plate, so as to reduce the difficulty of the first sealing element sealing the gap between the first side wall plate and the second side wall plate.

[0009] In some embodiments, the thickness of the first seal is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

[0010] In the above technical solution, on the one hand, setting the thickness of the first sealing element to be greater than or equal to 1.5mm can further improve the relative floating size of the first side wall plate and the second side wall plate, thereby further improving the sealing effect of the first sealing element on the gap between the first side wall plate and the second side wall plate, and further improving the buffering effect of the first sealing element between the first side wall plate and the second side wall plate. On the other hand, setting the thickness of the first sealing element to be less than or equal to 3.5mm can further alleviate the phenomenon of the first sealing element occupying too much space between the first side wall plate and the second side wall plate, thereby further improving the volumetric energy density of the battery device, and further optimizing the gap size between the first side wall plate and the second side wall plate, so as to further reduce the difficulty of the first sealing element sealing the gap between the first side wall plate and the second side wall plate.

[0011] In some embodiments, the first locking member includes a first locking portion and a first limiting portion. Along the axial direction of the first locking portion, the first locking portion passes through the second sidewall plate and the first seal and is locked onto the first sidewall plate. The first limiting portion is connected to one end of the first locking portion and abuts against the side of the second sidewall plate opposite to the first seal.

[0012] In the above technical solution, the first locking member is provided with a first locking part locked to the first side wall plate and a first limiting part connected to one end of the first locking part. By inserting the first locking part into the first sealing member and the second side wall plate, and abutting the first limiting part against the side of the second side wall plate away from the first sealing member, the first locking part and the first limiting part locked to the first side wall plate can cooperate to clamp the first sealing member and the second side wall plate between the first side wall plate and the first limiting part, so as to realize the assembly connection between the first side wall plate and the second side wall plate and the clamping of the first sealing member by the first side wall plate and the second side wall plate.

[0013] In some embodiments, the second sidewall plate is provided with a first through hole through which the first locking part passes, the first locking part having a first portion passing through the first through hole, and the first limiting part being connected to the first portion; wherein the diameter of the first portion is smaller than the diameter of the first through hole.

[0014] In the above technical solution, by setting the outer diameter of the first part of the first locking part located in the first through hole of the second side wall plate to be smaller than the diameter of the first through hole, the first part of the first locking part and the second side wall plate are in a clearance fit structure, so that the second side wall plate has the ability to float relative to the first locking part during use. Since the first locking part is a structure locked to the first side wall plate, the second side wall plate has the ability to float relative to the first side wall plate during use, thereby alleviating the pulling or torsion caused by the first side wall plate and the first locking part on the second side wall plate, which is conducive to further reducing the stress impact on the second box body during use.

[0015] In some embodiments, the difference between the diameter of the first portion and the diameter of the first through hole is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0016] In the above technical solution, on the one hand, setting the difference between the outer diameter of the first part of the first locking part and the diameter of the first through hole to be greater than or equal to 0.2 mm can improve the gap between the first part of the first locking part and the hole wall of the first through hole, thereby improving the ability of the second side wall plate to float relative to the first locking part during use, so as to further alleviate the pulling or twisting caused by the first side wall plate and the first locking part to the second side wall plate. On the other hand, setting the difference between the outer diameter of the first part of the first locking part and the diameter of the first through hole to be less than or equal to 3 mm can alleviate the phenomenon that the assembly difficulty between the first locking part and the second side wall plate is too large due to the excessive gap between the first part of the first locking part and the hole wall of the first through hole, and can optimize the difference between the outer diameter of the first limiting part and the first locking part of the first locking part, which is conducive to reducing the molding difficulty of the first locking part.

[0017] In some embodiments, along the axial direction of the first locking portion, the first limiting portion has a first abutting surface that abuts against the second sidewall plate; wherein, the orthogonal projection of the hole wall surface of the first through hole onto the axial direction of the first locking portion is located within the first abutting surface.

[0018] In the above technical solution, by setting the orthogonal projection of the hole wall of the first through hole on the axial direction of the first locking part to be located in the first abutting surface, the outer edge of the first limiting part is abutting against the second side wall plate, thereby improving the stability and reliability of the mutual abutment between the first limiting part and the second side wall plate, and further improving the stability and reliability of the connection between the first locking part and the first side wall plate and the second side wall plate.

[0019] In some embodiments, the first locking portion includes a first part and a second part, the second part and the first limiting part being respectively connected to the two ends of the first part in the axial direction of the first locking portion, and the diameter of the first part being larger than the diameter of the second part; wherein, along the axial direction of the first locking portion, the first part passes through the second side wall plate and the first seal, and the first part abuts against the surface of the first side wall plate facing the first seal, and the second part is locked onto the first side wall plate.

[0020] In the above technical solution, by setting the outer diameter of the first part of the first locking part that passes through the first seal and the second side wall plate to be larger than the outer diameter of the second part of the first locking part that locks with the first side wall plate, and setting the first part to abut against the surface of the first side wall plate facing the first seal along the axial direction of the first locking part, the first part can also limit the second part along the axial direction of the first locking part when the second part locks with the first side wall plate. In this way, the cooperation between the first part and the second part can improve the stability of the first locking part locking with the first side wall plate, thereby improving the reliability of the connection between the first locking part and the first side wall plate.

[0021] In some embodiments, the first locking part is screwed to the first side wall plate.

[0022] In the above technical solution, by setting the first locking part of the first locking member to be screwed to the first side wall plate, the first locking member and the first side wall plate are locked together by threaded connection. With this structure, the locking force between the first side wall plate and the second side wall plate and the clamping force on the first seal can be adjusted by adjusting the screwing depth between the first locking part and the first side wall plate, so as to meet different usage requirements. Moreover, this structure facilitates the assembly and disassembly of the first side wall plate and the second side wall plate.

[0023] In some embodiments, the second sidewall panel includes a body portion and a first flange edge. Along the first direction, one end of the body portion is connected to the top plate, and the first flange edge is connected to the end of the body portion away from the top plate. The first flange edge and the first sidewall panel are stacked, and the first sealing member is disposed between the first flange edge and the first sidewall panel. The first locking member passes through the first sealing member and locks the first sidewall panel and the first flange edge. The wall thickness of the first flange edge is greater than the wall thickness of the body portion.

[0024] In the above technical solution, by setting the wall thickness of the first flange edge of the second side wall plate to be greater than the wall thickness of the body of the second side wall plate, the area of ​​the second side wall plate used to connect with the first side wall plate is a region with increased thickness, thereby improving the structural strength of the area where the second side wall plate and the first side wall plate are connected, so as to reduce the risk of deformation or cracking of the second side wall plate at the location where it connects with the first side wall plate.

[0025] In some embodiments, the battery device further includes a buffer; the buffer is disposed between the second sidewall panel and the battery cell.

[0026] In the above technical solution, by setting a buffer between the second side wall panel and the battery cell, the buffer can absorb at least a portion of the stress on the second side wall panel during the process of the stress generated on the first box body being transmitted to the top plate through the second side wall panel, thereby reducing the stress impact on the top plate and further alleviating the deformation or bulging of the top plate of the second box body during use.

[0027] In some embodiments, the buffer is supported between the second sidewall panel and the battery cell, and the second sidewall panel bulges in a direction away from the battery cell.

[0028] In the above technical solution, by setting the buffer component as a structure that supports the second side wall panel and the battery cell and lifts the second side wall panel away from the battery cell, the buffer component can better absorb the stress on the second side wall panel, and the second side wall panel is a pre-deformed structure so that at least part of the stress can be released on the second side wall panel, thereby further reducing the stress on the top plate and further alleviating the deformation or bulging of the top plate of the second box body during use.

[0029] In some embodiments, along the first direction, at least a portion of the top plate bulges toward the battery cell to form a recessed area on the side of the top plate opposite to the battery cell.

[0030] In the above technical solution, by setting at least a portion of the top plate to bulge towards the battery cell, so that the side of the top plate away from the battery cell in the first direction is recessed towards the battery cell and forms a pre-deformed structure, the bulging phenomenon or bulging amplitude of the top plate can be reduced to a certain extent when the top plate is affected by bending moment or stress during use and bulges in the first direction away from the battery cell.

[0031] In some embodiments, the top plate is provided with a reinforcing portion, which is configured to enhance the bending strength of the top plate.

[0032] In the above technical solution, by providing a reinforcing part on the top plate of the second box body, and the reinforcing part being able to enhance the bending strength of the top plate, the top plate of the second box body is a structure in which the bending strength of at least a portion of the area is enhanced. The second box body with this structure can enhance the ability of the top plate of the second box body to resist the stress transmitted to the second box body by the first box body, thereby further alleviating the deformation or bulging phenomenon caused by stress on the top plate of the second box body during use, which is conducive to further extending the service life of the battery device, and can further reduce the safety hazards of the battery device during use, which is conducive to further improving the service life and reliability of the battery device.

[0033] In some embodiments, the reinforcing portion is integrally formed with the top plate, and along the first direction, the reinforcing portion protrudes from the surface of one side of the top plate.

[0034] In the above technical solution, by protruding a reinforcing part on one side of the top plate along the first direction, the area of ​​the top plate with the protruding reinforcing part is a region with enhanced bending strength. The structure is simple and easy to implement. Furthermore, by setting the reinforcing part and the top plate as an integrally formed structure, the connection stability and reliability between the reinforcing part and the top plate can be effectively improved, which helps to reduce the risk of the reinforcing part detaching from the top plate during use. Moreover, the use of this integrally formed structure can better enhance the bending strength of the top plate through the reinforcing part.

[0035] In some embodiments, the reinforcing part is separately disposed from the top plate, the reinforcing part is embedded in the top plate, and the stiffness of the reinforcing part is greater than the stiffness of the top plate.

[0036] In the above technical solution, by embedding a stiffer part inside the top plate, the stiffer part can enhance the stiffness of the top plate in this area, thereby enhancing the bending strength and deformation resistance of the top plate. The structure is simple and the stiffer part can be replaced with a stiffer part according to different usage requirements.

[0037] In some embodiments, the top plate and the second side wall plate are integrally formed.

[0038] In the above technical solution, by setting the top plate and the second side wall plate of the second box body as an integrally formed structure, the connection stability and reliability between the top plate and the second side wall plate are improved, which helps to improve the overall structural strength of the second box body.

[0039] In some embodiments, the first box body includes two first sidewall panels disposed opposite to each other along a second direction, and the second box body includes two second sidewall panels disposed opposite to each other along the second direction, each second sidewall panel being connected to one of the first sidewall panels; wherein, the first box body further includes two third sidewall panels disposed opposite to each other along a third direction, both of the two third sidewall panels being connected to the side of the support plate facing the top plate, the two third sidewall panels being located at both ends of the second box body in the third direction, and the top plate and the two second sidewall panels being connected to the third sidewall panels, the first direction, the second direction and the third direction being perpendicular to each other.

[0040] In the above technical solution, the first box body includes two first side wall panels arranged opposite each other along the second direction, and the second box body includes two second side wall panels arranged opposite each other along the second direction. Each second side wall panel is connected to a first side wall panel to realize the mutual connection between the two sides of the first box body and the second box body in the second direction. The first box body also includes two third side wall panels at both ends of the top plate arranged at intervals along the third direction. Each third side wall panel is connected to the top plate of the second box body and the two second side wall panels to realize the mutual connection between the two sides of the first box body and the second box body in the third direction. This enables the assembly connection between the first box body and the second box body and jointly defines the assembly space for accommodating the battery cells. The structure is simple and easy to assemble.

[0041] In some embodiments, the second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction. The thickness direction of the first flange edge is parallel to the second direction, and the first flange edge and the first sidewall panel are stacked along the second direction. The first sealing member is disposed between the first flange edge and the first sidewall panel, and the first locking member passes through the first sealing member and locks the first flange edge and the first sidewall panel.

[0042] In the above technical solution, by setting the first flange edge that connects the second side wall plate to the first side wall plate as a structure that is stacked and connected to the first side wall plate, the stacking direction of the first flange edge and the first side wall plate is consistent with the thickness direction of the first flange edge and the same as the arrangement direction of the two first side wall plates. This reduces the difficulty of the first locking member locking the first side wall plate and the second side wall plate, and also reduces the difficulty of clamping the first sealing member between the first side wall plate and the second side wall plate, thereby reducing the assembly difficulty of the battery device.

[0043] In some embodiments, along the second direction, the first sidewall plate is located on the side of the first flange facing the assembly space.

[0044] In the above technical solution, by setting the first side wall panel to be located on the side of the first flange facing the assembly space in the second direction, the two first side wall panels of the first box body are located between the two second side wall panels in the second direction, so that the second side wall panel with a larger size in the first direction is located outside the two first side wall panels in the second direction. This makes it easier for the second side wall panel to cover the first side wall panel and helps to reduce the assembly difficulty between the first side wall panel and the second side wall panel.

[0045] In some embodiments, the second box body is provided with second flange edges at both ends in the third direction, and the second flange edges connect the top plate and the two second side wall plates; wherein, both ends of the third side wall plate in the second direction and the end of the third side wall plate away from the bearing plate in the first direction are connected to the second flange edges.

[0046] In the above technical solution, by setting a second flange edge connecting the top plate and the two second side wall plates on the second box body, and the two ends of the third side wall plate in the second direction and the end of the third side wall plate away from the bearing plate in the first direction are both connected to the second flange edge, the third side wall plate is a structure that is connected to the top plate of the second box body and the two second side wall plates through the second flange edge, thereby reducing the assembly difficulty between the third side wall plate and the second box body.

[0047] In some embodiments, the third sidewall panel and the second flange edge do not contact each other, and a second sealing element is sandwiched between the third sidewall panel and the second flange edge; wherein, the battery device further includes a second locking element, which passes through the second sealing element and locks the third sidewall panel and the second flange edge to connect the third sidewall panel and the second flange edge.

[0048] In the above technical solution, the third side wall panel and the second flange edge do not contact each other, and a second sealing element is sandwiched between the third side wall panel and the second flange edge, so that the third side wall panel and the second flange edge are indirectly abutted by the second sealing element. The second locking element is a structure that passes through the second sealing element and connects the third side wall panel and the second flange edge, so that the third side wall panel and the second flange edge are locked by the second locking element and abutted against the second sealing element. Thus, while realizing the mutual assembly and connection of the third side wall panel and the second flange edge, the second sealing element can also play a certain buffering and separation role between the third side wall panel and the second flange edge, so that the second sealing element can absorb and release the stress generated by the deformation of the first box body during use, thereby reducing the stress transmitted from the third side wall panel of the first box body to the second flange edge of the second box body. This can further reduce the stress impact on the top plate of the second box body, thereby further alleviating the deformation or bulging of the top plate of the second box body during use, which is conducive to further extending the service life of the battery device and further reducing the safety hazards of the battery device during use, thereby further improving the service life and reliability of the battery device.

[0049] In some embodiments, the thickness of the second seal is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0050] In the above technical solution, on the one hand, setting the thickness of the second seal to be greater than or equal to 0.5mm can improve the relative floating size of the third side wall plate and the second flange edge, thereby improving both the sealing effect of the second seal on the gap between the third side wall plate and the second flange edge and the buffering effect of the second seal between the third side wall plate and the second flange edge. On the other hand, setting the thickness of the second seal to be less than or equal to 5mm can alleviate the phenomenon of the second seal occupying too much space between the third side wall plate and the second flange edge, thereby improving the volumetric energy density of the battery device and optimizing the gap size between the third side wall plate and the second flange edge, so as to reduce the difficulty of the second seal sealing the gap between the third side wall plate and the second flange edge.

[0051] In some embodiments, the thickness of the second seal is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

[0052] In the above technical solution, on the one hand, setting the thickness of the second seal to be greater than or equal to 1.5mm can further improve the relative floating size of the third side wall plate and the second flange edge, thereby further improving the sealing effect of the second seal on the gap between the third side wall plate and the second flange edge, and further improving the buffering effect of the second seal on the gap between the third side wall plate and the second flange edge. On the other hand, setting the thickness of the second seal to be less than or equal to 3.5mm can further alleviate the phenomenon of the second seal occupying too much space between the third side wall plate and the second flange edge, thereby further improving the volumetric energy density of the battery device, and further optimizing the gap size between the third side wall plate and the second flange edge, so as to further reduce the difficulty of the second seal sealing the gap between the third side wall plate and the second flange edge.

[0053] In some embodiments, the second locking member includes a second locking portion and a second limiting portion. Along the axial direction of the second locking portion, the second locking portion passes through the second flange edge and the second seal and is locked onto the third sidewall plate. The second limiting portion is connected to one end of the second locking portion and abuts against the side of the second flange edge away from the second seal.

[0054] In the above technical solution, the second locking member is provided with a second locking part that locks onto the third side wall plate and a second limiting part connected to one end of the second locking part. By inserting the second locking part into the second seal and the second flange edge, and by abutting the second limiting part against the side of the second flange edge away from the second seal, the second locking part and the second limiting part locked onto the third side wall plate can cooperate to clamp the second seal and the second flange edge between the third side wall plate and the second limiting part, so as to realize the assembly connection between the third side wall plate and the second flange edge, as well as the clamping of the second seal by the third side wall plate and the second flange edge.

[0055] In some embodiments, the second flange edge is provided with a second through hole through which the second locking part passes, the second locking part has a third portion passing through the second through hole, and the second limiting part is connected to the third portion; wherein, the diameter of the third portion is smaller than the diameter of the second through hole.

[0056] In the above technical solution, by setting the outer diameter of the third part of the second locking part located in the second through hole of the second flange edge to be smaller than the diameter of the second through hole, the third part of the second locking part and the second flange edge are in clearance fit, so that the second flange edge has the ability to float relative to the second locking part during use. Since the second locking part is a structure locked to the third side wall plate, the second flange edge has the ability to float relative to the third side wall plate during use, thereby alleviating the tension or torsion caused by the third side wall plate and the second locking part on the second flange edge, which is conducive to further reducing the stress influence on the second box body during use.

[0057] In some embodiments, the difference between the diameter of the third portion and the diameter of the second through hole is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0058] In the above technical solution, on the one hand, setting the difference between the outer diameter of the third part of the second locking part and the diameter of the second through hole to be greater than or equal to 0.2 mm can improve the gap between the third part of the second locking part and the hole wall of the second through hole, thereby improving the ability of the second flange edge to float relative to the second locking part during use, so as to further alleviate the pulling or twisting caused by the third side wall plate and the second locking part on the second flange edge. On the other hand, setting the difference between the outer diameter of the third part of the second locking part and the diameter of the second through hole to be less than or equal to 3 mm can alleviate the phenomenon that the assembly difficulty between the second locking part and the second flange edge is too large due to the excessive gap between the third part of the second locking part and the hole wall of the second through hole, and can optimize the difference between the outer diameter of the second limiting part and the second locking part of the second locking part, which is conducive to reducing the molding difficulty of the second locking part.

[0059] In some embodiments, along the axial direction of the second locking portion, the second limiting portion has a second abutting surface that abuts against the edge of the second flange; wherein, the orthogonal projection of the hole wall surface of the second through hole onto the axial direction of the second locking portion is located within the second abutting surface.

[0060] In the above technical solution, by setting the orthogonal projection of the hole wall surface of the second through hole on the axial direction of the second locking part to be located in the second abutting surface, the outer edge of the second limiting part is abutting against the second flange edge, thereby improving the stability and reliability of the mutual abutment between the second limiting part and the second flange edge, and further improving the stability and reliability of the second locking part connecting the third side wall plate and the second flange edge.

[0061] In some embodiments, the second locking portion includes a third portion and a fourth portion, wherein the fourth portion and the second limiting portion are respectively connected to the two ends of the third portion in the axial direction of the second locking portion, and the diameter of the third portion is larger than the diameter of the fourth portion; wherein, along the axial direction of the second locking portion, the third portion passes through the second flange edge and the second seal, and the third portion abuts against the surface of the third sidewall facing the second seal, and the fourth portion is locked onto the third sidewall.

[0062] In the above technical solution, by setting the outer diameter of the third part of the second locking part that passes through the second seal and the second flange edge to be larger than the outer diameter of the fourth part of the second locking part that locks with the third side wall plate, and setting the third part to abut against the surface of the third side wall plate facing the second seal along the axial direction of the second locking part, the third part can also limit the fourth part along the axial direction of the second locking part when the fourth part and the third side wall plate are locked together. In this way, the cooperation between the third part and the fourth part can improve the stability of the second locking part locked on the third side wall plate, thereby improving the reliability of the connection between the second locking part and the third side wall plate.

[0063] In some embodiments, the second locking part is screwed onto the third sidewall panel.

[0064] In the above technical solution, by setting the second locking part of the second locking member to be screwed to the third side wall plate, the second locking member and the third side wall plate are locked together by threaded connection. With this structure, the locking force between the third side wall plate and the second flange edge and the clamping force on the second sealing element can be adjusted by adjusting the threaded depth between the second locking part and the third side wall plate, so as to meet different usage requirements. Moreover, this structure facilitates the assembly and disassembly of the third side wall plate and the second flange edge.

[0065] In some embodiments, the second flange edge includes a first segment and two second segments, the first segment being connected to the top plate, and the two second segments being respectively connected to two second sidewall plates; wherein, the second sealing element includes a first sealing portion and two second sealing portions, the two sealing portions being respectively connected to the two ends of the first sealing portion in the second direction, the first sealing portion being disposed between the first segment and the third sidewall plate, each second sealing portion being disposed between a second segment and the third sidewall plate, the battery device including a plurality of second locking elements, at least one second locking element passing through the first sealing portion and locking the first segment and the third sidewall plate, and at least one second locking element passing through the second sealing portion and locking the second segment and the third sidewall plate.

[0066] In the above technical solution, a first sealing part of a second sealing element is provided between the first section of the second flange edge and the third side wall plate, and a second sealing part of the second sealing element is provided between the second section of the second flange edge and the third side wall plate. This makes the end of the third side wall plate away from the bearing plate in the first direction and both ends of the third side wall plate in the second direction indirectly contact the second flange edge through the second sealing element. This allows the second sealing element to better absorb and release the stress generated by the deformation of the first box body during use, thereby reducing the stress transmitted from the third side wall plate of the first box body to the second box body. In addition, at least one second locking member is a structure that passes through the first sealing part and locks the first section and the third side wall plate, and at least one second locking member is a structure that passes through the second sealing part and locks the second section and the third side wall plate. This makes the end of the third side wall plate away from the bearing plate in the first direction and both ends of the third side wall plate in the second direction corresponding to the second flange edge and locked with the second locking member. This helps to improve the connection stability and reliability between the second flange edge and the third side wall plate.

[0067] In some embodiments, the second flange edge further includes an arc segment, and each second segment is connected to the first segment through one of the arc segments; wherein, the second sealing member further includes a transition portion, and each second sealing portion is connected to the first sealing portion through one of the transition portions, the transition portion being disposed between the arc segment and the third side wall plate, and at least one second locking member passing through the transition portion and locking the arc segment and the third side wall plate.

[0068] In the above technical solution, by connecting the first section connecting the second flange edge to the top plate and the second section connecting the second flange edge to the second side wall plate with an arc segment, the area where the second flange edge connects to the top plate and the area where the second flange edge connects to the second side wall plate is a structure with an arc transition. This reduces the occurrence of sharp corners at the connection point of the second flange edge with the top plate and the second side wall plate. On the one hand, it alleviates the stress concentration at the connection point of the second flange edge with the top plate and the second side wall plate, thereby reducing the risk of damage or cracking of the second flange edge during use. On the other hand, it facilitates the formation of a transition part connecting the first sealing part and the second sealing part at the arc segment corresponding to the second flange edge of the second sealing element. This makes the first sealing part and the second sealing part of the second sealing element an integral structure, while also reducing the susceptibility of the part of the second sealing element located between the arc segment of the second flange edge and the third side wall plate to damage. Thus, it improves the sealing effect of the second sealing element between the second flange edge and the third side wall plate while also ensuring the service life of the second sealing element.

[0069] In some embodiments, the first segment and the top plate are connected by a connecting portion; the top plate has a first inner surface facing the support plate in the first direction, the first segment has a second inner surface facing the support plate in the first direction, the second inner surface abuts against the third sidewall panel, and the second inner surface and the first inner surface are connected by the inner surface of the connecting portion; wherein, along the first direction, the first inner surface is further away from the support plate than the second inner surface.

[0070] In the above technical solution, the first section of the second flange edge and the top plate are connected to each other through a connecting part, and the first inner surface of the top plate is further away from the bearing plate in the first direction than the second inner surface of the first section. This ensures that the arc segment and other structures of the second flange edge do not excessively affect the shape of the top plate and the second side wall plate. As a result, the side of the second box body facing the battery cell and the position corresponding to the top plate are recessed in the first direction away from the battery cell. This allows the second box body to be assembled and connected to the third side wall plate of the first box body through the second flange edge, and also increases the volume of the assembly space jointly defined by the first box body and the second box body. This reduces the assembly difficulty of the second box body and the third side wall plate of the first box body while increasing the internal space of the battery device for accommodating the battery cells.

[0071] In some embodiments, the second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction, and the first flange edge of each second sidewall panel is connected to two second flange edges at both ends in the third direction.

[0072] In the above technical solution, by connecting the two ends of the first flange edge of the second side wall plate in the third direction to the two second flange edges located at the two ends of the top plate in the third direction, the first flange edge and the second flange edge of the second box body used for assembly and connection with the first box body are formed into an integral structure, thereby improving the overall structural strength of the second box body and effectively improving the assembly reliability between the second box body and the first box body.

[0073] In some embodiments, the first sidewall panel and the support plate are separately disposed but connected.

[0074] In the above technical solution, by setting the first side wall panel and the bearing plate as separate structures, on the one hand, it can reduce the difficulty of setting the first side wall panel on both sides of the bearing plate along the second direction, thereby reducing the manufacturing difficulty of the first box body. On the other hand, it can adjust the position of the first side wall panel in the first direction according to the actual situation, thereby adjusting the size of the first side wall panel protruding from the bearing surface of the bearing plate in the first direction, which is beneficial to improving the applicability of the first box body.

[0075] In some embodiments, the third sidewall panel is detachably connected to the support plate.

[0076] In the above technical solution, by setting the third side wall panel to be detachably connected to the support plate, different third side wall panels can be replaced according to different usage requirements, and it is convenient to maintain and repair the first box body in the future, which helps to reduce the later use cost of the battery device.

[0077] In some embodiments, the first box body further includes a reinforcing member; the reinforcing member is disposed on the side of the support plate facing the top plate, the reinforcing member extends along the second direction, and the two ends of the reinforcing member in the second direction are respectively connected to the two first side wall plates.

[0078] In the above technical solution, by providing a reinforcing member on the side of the bearing plate facing the top plate, and the reinforcing member extending along the second direction and connecting with both first side wall plates, the two first side wall plates located on both sides of the bearing plate in the second direction can be further reinforced and strengthened by the reinforcing member, which is beneficial to improving the overall structural strength of the first box body.

[0079] In some embodiments, the first housing body includes two reinforcing members, which are spaced apart along the third direction, and the battery cell is disposed between the two reinforcing members along the third direction.

[0080] In the above technical solution, by setting two reinforcing members on the support plate, and the two reinforcing members are arranged at intervals along the third direction on both sides of all battery cells, the battery device with this structure can, on the one hand, realize the connection between the two reinforcing members and the two first side wall panels to form an integral frame structure, which is conducive to further improving the overall structural strength of the first box body. On the other hand, the two reinforcing members can also play a certain limiting role in the third direction of the battery cells placed on the support plate, so as to reduce the risk of the battery cells shaking or shifting along the third direction during use.

[0081] In some embodiments, the first box body includes a plurality of first side wall panels, which surround the support plate and are connected end to end in sequence; wherein, the second box body includes a plurality of second side wall panels, which surround the top plate and are connected end to end in sequence, and each second side wall panel is connected to one of the first side wall panels.

[0082] In the above technical solution, the first box body is provided with a plurality of first side wall panels surrounding the support plate, and correspondingly, the second box body is provided with a plurality of second side wall panels surrounding the top plate, and each second side wall panel is connected to a first side wall panel, so that the first box body and the second box body are both structures that are open on one side and cover each other, thereby realizing the assembly connection between the first box body and the second box body and jointly defining the assembly space for accommodating the battery cell. The structure is simple and easy to implement.

[0083] In some embodiments, the second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction. The thickness direction of the first flange edge is parallel to the first direction, and the first flange edge and the first sidewall panel are stacked along the first direction. The first sealing member is disposed between the first flange edge and the first sidewall panel, and the first locking member passes through the first sealing member and locks the first flange edge and the first sidewall panel.

[0084] In the above technical solution, by setting the first flange edge of the second side wall plate for interconnection with the first side wall plate as a structure stacked with the first side wall plate along the first direction, the stacking direction of the first flange edge and the first side wall plate is consistent with the thickness direction of the first flange edge and the same as the closing direction of the first box body and the second box body. This reduces the difficulty of locking the first side wall plate and the first flange edge with the first locking member, and also reduces the difficulty of clamping the first sealing member between the first side wall plate and the second side wall plate, thereby reducing the assembly difficulty of the battery device.

[0085] In some embodiments, the first flange edges of a plurality of second sidewall panels are connected end to end in sequence.

[0086] In the above technical solution, by setting the first flange edges of multiple second side wall panels to be connected end to end, the first flange edges of multiple second side wall panels form an integral structure and a ring structure extending circumferentially along the top plate. This not only improves the overall structural strength of the second box body, but also effectively improves the assembly reliability between the second box body and the first box body.

[0087] In some embodiments, the first sidewall panel includes a panel body and a flange portion. The panel body is connected to the support plate and protrudes from the support surface. The flange portion is connected to the end of the panel body away from the support plate, and the thickness direction of the flange portion is parallel to the first direction. The flange portion and the first flange edge are stacked along the first direction. The first sealing member is disposed between the first flange edge and the flange portion. The first locking member passes through the first sealing member and locks the first flange edge and the flange portion.

[0088] In the above technical solution, the first side wall panel includes a plate body and a flange portion that are connected to each other. The plate body is connected to the bearing plate and protrudes from the bearing surface, and the thickness direction of the flange portion is parallel to the first direction, so that the cross-section of the first side wall panel is a bent "L" shaped structure. By setting the flange portion of the first side wall panel in a structure that is stacked and connected to the first flange edge along the first direction, the assembly difficulty between the first box body and the second box body can be reduced, and the contact area between the first box body and the second box body can be increased to improve the connection stability between the first box body and the second box body.

[0089] In some embodiments, the first sidewall panel and the support plate are integrally formed.

[0090] In the above technical solution, by setting the first side wall panel as an integrally formed structure with the support plate, on the one hand, the connection stability and reliability between the first side wall panel and the support plate can be improved, which helps to reduce the risk of the first side wall panel and the support plate separating during use, thereby improving the reliability of the first box body. On the other hand, it can reduce the difficulty of setting multiple first side wall panels around the support plate, thereby reducing the molding difficulty of the first box body.

[0091] In some embodiments, the support plate has internal channels for containing heat exchange media, and the support plate is also configured to manage the temperature of the battery cells.

[0092] In the above technical solution, by setting a flow channel inside the support plate to accommodate the heat exchange medium, the support plate also has the function of heat exchange with the battery cells. Thus, the support plate can not only support the battery cells, but also manage the temperature of the battery cells during use. The components for managing the temperature of the battery cells are integrated into the support plate, thereby improving the internal space utilization of the battery device while managing the temperature of the battery cells. This is beneficial to improving the reliability of the battery device while taking into account the volumetric energy density of the battery device.

[0093] In some embodiments, the battery device further includes a heat-conducting element disposed between the bearing surface and the battery cell along the first direction.

[0094] In the above technical solution, by setting a heat-conducting component between the battery cell and the bearing surface of the carrier plate, the heat-conducting component can improve the heat transfer efficiency between the battery cell and the carrier plate, thereby improving the carrier plate's effect on managing the temperature of the battery cell.

[0095] Secondly, embodiments of this application also provide an electrical device, including the battery device described above, wherein the battery device is used to provide electrical energy. Attached Figure Description

[0096] 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.

[0097] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0098] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0099] Figure 3 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0100] Figure 4 This is a schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application;

[0101] Figure 5 This is a schematic diagram of the structure of the first housing body of the battery device provided in some embodiments of this application;

[0102] Figure 6 A cross-sectional view of a battery device provided in some embodiments of this application, perpendicular to a third direction;

[0103] Figure 7 for Figure 6 A partial enlarged view of point A of the battery device shown;

[0104] Figure 8 A cross-sectional view of the second housing body of a battery device provided in some embodiments of this application, perpendicular to a third direction;

[0105] Figure 9A cross-sectional view of the second housing body of the battery device provided in some embodiments of this application, perpendicular to a third direction;

[0106] Figure 10 for Figure 9 A magnified view of part B of the second box body shown;

[0107] Figure 11 A schematic diagram of the structure of the second housing body of the battery device provided in some embodiments of this application;

[0108] Figure 12 A cross-sectional view of the second housing body of the battery device provided in some embodiments of this application, perpendicular to a third direction;

[0109] Figure 13 A cross-sectional view of the second housing body of the battery device provided in other embodiments of this application, perpendicular to a third direction;

[0110] Figure 14 A cross-sectional view of a battery device provided in some embodiments of this application, perpendicular to a second direction;

[0111] Figure 15 for Figure 14 A partial enlarged view of point C of the battery device shown;

[0112] Figure 16 A schematic diagram of the structure of a battery device provided in some further embodiments of this application;

[0113] Figure 17 Exploded views of the structure of the battery device provided in some further embodiments of this application;

[0114] Figure 18 A schematic diagram of the structure of the second housing body of the battery device provided in some further embodiments of this application;

[0115] Figure 19 A schematic diagram of the structure of the first housing body of the battery device provided in some further embodiments of this application;

[0116] Figure 20 A cross-sectional view of the second housing body of the battery device provided in some further embodiments of this application, perpendicular to a third direction;

[0117] Figure 21 A cross-sectional view of the first housing body of the battery device provided in some further embodiments of this application, perpendicular to a third direction;

[0118] Figure 22 for Figure 21 A magnified view of point D on the first box body shown.

[0119] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Battery Cell; 20 - First Box Body; 21 - Support Plate; 211 - Support Surface; 212 - Flow Channel; 22 - First Side Wall Panel; 221 - Connecting Part; 222 - Plate Body; 223 - Flanged Part; 23 - Third Side Wall Panel; 24 - Reinforcing Member; 30 - Second Box Body; 31 - Top Plate; 311 - Recessed Area; 312 - Reinforcing Part; 3121 - First Reinforcing Part; 3122 - Second Reinforcing Part; 313 - Groove; 314 - Body Layer; 315 - Connecting Layer; 316 - First Inner Surface; 32 - Second Side Wall Panel; 321 - Body Section; 322 - First Flange Edge; 3221 - First Through Hole; 33 - Second Flange Edge; 331 - First Section ; 3311-Second inner surface; 332-Second segment; 333-Arc segment; 334-Second through hole; 34-Connecting part; 40-Box body; 40a-Assembly space; 50-First seal; 60-First locking element; 61-First locking part; 611-First part; 612-Second part; 62-First limiting part; 621-First abutting surface; 70-Buffer element; 80-Second seal; 81-First sealing part; 90-Second locking element; 91-Second locking part; 911-Third part; 912-Fourth part; 92-Second limiting part; 921-Second abutting surface; 101-Heat-conducting element; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0120] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0121] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0122] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0123] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0124] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0125] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0126] In this application, "multiple" means two or more (including two).

[0127] 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.

[0128] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0129] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0130] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0131] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0132] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0133] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0134] In some implementations, the electrode assembly has a stacked structure.

[0135] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0136] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0137] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0138] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0139] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0140] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0141] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0142] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0143] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0149] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0150] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0151] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0152] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0153] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0154] For a typical battery pack, it includes a housing and multiple battery cells housed within it. The housing comprises a first housing body and a second housing body, which are interconnected to form an assembly space for accommodating the battery cells. During the use of the battery pack, the first housing body is typically mounted onto a corresponding mounting bracket. For example, in electric vehicles, a mounting structure is usually installed on the first housing body, which is used for assembly and connection with the vehicle's load-bearing beam to achieve battery pack assembly. However, due to dimensional or flatness differences between the mounting points of the battery pack and the mounting bracket, and due to the use of the battery pack... The complex environment causes the fasteners to exert a large torque on the first housing body, especially in structures where the height of the first housing body is smaller than that of the second housing body. This results in a weaker binding force between the first and second housing bodies and lower structural strength of the first housing body. Consequently, the first housing body is prone to deformation, and the stress generated by this deformation is transmitted to the top plate of the second housing body. This can lead to deformation or bulging of the top plate of the second housing body, resulting in a shorter lifespan for the battery housing and significant safety hazards during use. Ultimately, this is detrimental to improving the lifespan and reliability of the battery device.

[0155] Based on the above considerations, in order to solve the problems of short service life and low reliability of battery devices, this application provides a battery device including a battery cell, a first housing body, and a second housing body. The first housing body is provided with a mounting structure and includes a support plate and a first side wall plate. The support plate has a support surface on one side in a first direction, which supports the battery cell along the first direction. The first side wall plate is connected to the support plate and protrudes from the support surface. The second housing body, together with the first housing body, defines an assembly space for accommodating the battery cell. The second housing body includes a top plate and a second side wall plate, which are arranged opposite to each other along the first direction. One end of the second side wall plate is connected to the top plate in the first direction. Along the first direction, the dimension of the first side wall plate protruding from the support surface is less than one-quarter of the maximum dimension of the second side wall plate. The first side wall plate and the second side wall plate do not contact each other, and a first sealing element is sandwiched between the first side wall plate and the second side wall plate. The battery device also includes a first locking element, which passes through the first sealing element and locks the first side wall plate and the second side wall plate.

[0156] In this battery device structure, the battery device includes a first housing body and a second housing body. A first side wall panel of the first housing body and a second side wall panel of the second housing body are connected to each other. The first housing body is provided with a mounting structure for assembly and connection with a target component. This facilitates the support plate of the first housing body supporting and bearing the battery cells, and makes it easy to assemble the battery device onto the target component for power supply. By making the dimension of the first side wall panel protruding from the bearing surface less than one-quarter of the maximum dimension of the second side wall panel, the size of the first side wall panel used for assembly and connection with the second housing body is smaller. This optimizes the dimensions of the first housing body in the first direction and reduces the binding force of the first housing body on the second housing body, thereby reducing the assembly difficulty between the first housing body and the target component, and reducing the difficulty of assembling the battery cells onto the support plate, thus reducing the overall assembly difficulty of the battery device. The first side wall panel and the second side wall panel do not contact each other, and there is a connection between the first side wall panel and the second side wall panel. A first sealing element is clamped in such a way that the first side wall panel and the second side wall panel are indirectly abutted by the first sealing element. A first locking element passes through the first sealing element and connects the first side wall panel and the second side wall panel, thus locking the first side wall panel and the second side wall panel to the first sealing element. This allows the first side wall panel and the second side wall panel to be assembled and connected, while the first sealing element also acts as a buffer and separator between them. This allows the first sealing element to absorb and release stress generated by deformation of the first housing body during use, reducing the stress transmitted from the first side wall panel of the first housing body to the second side wall panel of the second housing body. This, in turn, reduces the stress on the top plate of the second housing body, mitigating deformation or bulging during use. This helps extend the battery device's lifespan and reduces safety hazards during use, thereby improving the battery device's lifespan and reliability.

[0157] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be composed of the battery device disclosed in this application. This helps to alleviate the problem of deformation or bulging of the battery device casing during use, thereby improving the service life and reliability of the battery device.

[0158] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0159] 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.

[0160] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0161] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0162] According to some embodiments of this application, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, Figure 2 This is a schematic diagram of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the second housing body 30 of the battery device 100 provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the first housing body 20 of the battery device 100 provided in some embodiments of this application. Figure 6This is a cross-sectional view of a battery device 100 provided in some embodiments of this application, perpendicular to a third direction Z. Figure 7 for Figure 6 A partial enlarged view of point A of the battery device 100 shown. Figure 8 This is a cross-sectional view of the second housing body 30 of a battery device 100 provided in some embodiments of this application, perpendicular to a third direction Z. This application provides a battery device 100, which includes a battery cell 10, a first housing body 20, and a second housing body 30. The first housing body 20 is provided with a mounting structure, including a support plate 21 and a first side wall plate 22. The support plate 21 has a support surface 211 on one side in the first direction X, which supports the battery cell 10 along the first direction X. The first side wall plate 22 is connected to the support plate 21 and protrudes from the support surface 211. The second housing body 30 and the first housing body 20 together define an assembly space 40a for accommodating the battery cell 10. The second housing body 30 includes a top plate 31 and a second side wall plate 32. The top plate 31 and the support plate 21 are arranged opposite each other along a first direction X. One end of the second side wall plate 32 is connected to the top plate 31 in the first direction X. Along the first direction X, the dimension of the first side wall plate 22 protruding from the support surface 211 is less than one-quarter of the maximum dimension of the second side wall plate 32. The first side wall plate 22 and the second side wall plate 32 do not contact each other, and a first sealing member 50 is sandwiched between the first side wall plate 22 and the second side wall plate 32. The battery device 100 also includes a first locking member 60, which passes through the first sealing member 50 and locks the first side wall plate 22 and the second side wall plate 32.

[0163] The first box body 20 is provided with a mounting structure, which can be a threaded hole, bolt or locking mechanism, etc., provided on the first box body 20. Multiple mounting structures are provided on the first box body 20 to fix the first box body 20 to the target part through the mounting structure, thereby realizing the assembly of the battery device 100 onto the target part. The specific structure of the mounting structure can be found in the relevant technology, and will not be described in detail here.

[0164] The first housing body 20 and the second housing body 30 of the battery device 100 together define an assembly space 40a for accommodating the battery cell 10, such that the first housing body 20 and the second housing body 30 together form the housing 40 of the battery device 100, and the housing 40 provides the assembly space 40a for the battery cell 10. Optionally, the housing 40 formed by the first housing body 20 and the second housing body 30 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of the box 40 formed by the first box body 20 and the second box body 30 is a cuboid. Correspondingly, the height direction of the box 40 is the first direction X, the width direction of the box 40 is the second direction Y, and the length direction of the box 40 is the third direction Z.

[0165] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 40. When there are multiple battery cells 10 disposed within the housing 40, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 40. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 40.

[0166] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0167] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 10 is in the shape of a cuboid.

[0168] The support plate 21 has a support surface 211 on one side in the first direction X. The support surface 211 is used to support the battery cell 10 along the first direction X. That is, the battery cell 10 is placed on the support surface 211 on the side of the support plate 21 facing the assembly space 40a, and the support plate 21 is located at the bottom of the battery cell 10 in the first direction X, so that the support surface 211 of the support plate 21 can support the battery cell 10. Correspondingly, the first direction X is the direction of gravity or a direction approximately equal to the direction of gravity.

[0169] The first side wall panel 22 is connected to the support plate 21 and protrudes from the support surface 211. That is, the first side wall panel 22 of the first box body 20 is connected to the support plate 21 and extends beyond the support surface 211 of the support plate 21 in the first direction X along the direction from the support plate 21 to the battery cell 10.

[0170] The top plate 31 and the support plate 21 are arranged opposite each other along the first direction X, that is, the support plate 21 of the first box body 20 and the top plate 31 of the second box body 30 are arranged at intervals along the first direction X and facing each other.

[0171] The second side wall panel 32 is connected to the first side wall panel 22, and the end of the second side wall panel 32 away from the bearing plate 21 in the first direction X is connected to the top plate 31. That is to say, the second side wall panel 32 is a structure in the second box body 30 that is assembled and connected to the first side wall panel 22 of the first box body 20, and the end of the second side wall panel 32 away from the first side wall panel 22 in the first direction X is connected to the top plate 31, so that the top plate 31 is a structure that is indirectly connected to the first side wall panel 22 through the second side wall panel 32, and the top plate 31 and the first side wall panel 22 are arranged at intervals in the first direction X.

[0172] Along the first direction X, the dimension of the first sidewall panel 22 protruding from the bearing surface 211 is less than one-quarter of the maximum dimension of the second sidewall panel 32, see [reference]. Figure 7 and Figure 8 As shown, the first sidewall panel 22 protrudes from the bearing surface 211 in the first direction X by a dimension D1, and the second sidewall panel 32 has a maximum dimension D2 in the first direction X, that is, D1 < 0.25D2.

[0173] It should be noted that among the multiple side wall panels of the first box body 20, the side wall panel whose size protruding from the bearing surface 211 is less than one-quarter of the maximum size of the second side wall panel 32 is the first side wall panel 22. Correspondingly, the mounting structure can be set on the bearing plate 21 or on the first side wall panel 22.

[0174] For example, in Figure 7 In the structure, the first side wall panel 22 and the support plate 21 are separate components. One end of the support plate 21 in the second direction Y is connected to the first side wall panel 22, and the first side wall panel 22 protrudes along the first direction X from the support surface 211 of the support plate 21 facing the assembly space 40a.

[0175] The first side wall panel 22 and the second side wall panel 32 do not contact each other, and a first sealing element 50 is sandwiched between the first side wall panel 22 and the second side wall panel 32. That is to say, the first side wall panel 22 and the second side wall panel 32 do not directly abut against each other, but the first side wall panel 22 and the second side wall panel 32 are indirectly abutted against each other through the first sealing element 50. That is, the first side wall panel 22 is abutted against the second side wall panel 32 through the first sealing element 50. Correspondingly, the first side wall panel 22 and the second side wall panel are arranged at intervals, and the first sealing element 50 is disposed between the first side wall panel 22 and the second side wall panel 32 and separates the first side wall panel 22 and the second side wall panel 32.

[0176] For example, the material of the first seal 50 can be various, such as rubber, plastic or silicone.

[0177] The battery device 100 also includes a first locking member 60, which passes through the first sealing member 50 and locks the first side wall plate 22 and the second side wall plate 32, so that the first locking member 60 serves to connect the first side wall plate 22 and the second side wall plate 32. The structure of the first locking member 60 can be various, such as bolts or rivets. For example, in... Figure 7 In the middle, the first locking member 60 is a bolt, which passes through the second side wall plate 32 and is screwed onto the first side wall plate 22.

[0178] Optionally, the first sidewall panel 22 has a mating portion 221 that is threadedly engaged with the first locking member 60. The mating portion 221 is threadedly engaged with the first locking member 60 to achieve the first locking member 60 being screwed onto the first sidewall panel 22. For example, in Figure 7 In this embodiment, the mating part 221 is the rivet nut on the first side wall plate 22, and the mating part 221 and the second side wall plate 32 are also connected to each other by the first sealing member 50. Of course, in other embodiments, the mating part 221 can also be the area on the first side wall plate 22 with a threaded hole.

[0179] It should be noted that the materials of the first box body 20 and the second box body 30 can be various. The first box body 20 and the second box body 30 can be non-metallic materials, such as polymer composite materials. Of course, the first box body 20 and the second box body 30 can also be metallic materials, such as aluminum, aluminum alloy, or steel. Similarly, the materials of the first box body 20 and the second box body 30 can be of the same structure or different structures.

[0180] In this embodiment, the battery device 100 includes a first housing body 20 and a second housing body 30. The first side wall panel 22 of the first housing body 20 and the second side wall panel 32 of the second housing body 30 are interconnected. The first housing body 20 is provided with a mounting structure for assembly and connection with a target component, so that the support plate 21 of the first housing body 20 supports and carries the battery cell 10, and facilitates the assembly of the battery device 100 onto the target component for power supply. This is achieved by the first side wall panel 22 of the first housing body 20 protruding from the support surface 211 by a dimension smaller than the maximum dimension of the second side wall panel 32. The size of the first side wall plate 22, which is used for assembly and connection between the first box body 20 and the second box body 30, is smaller. This helps to optimize the size of the first box body 20 in the first direction X and reduces the binding force of the first box body 20 on the second box body 30. This reduces the assembly difficulty between the first box body 20 and the target component, and also reduces the difficulty of assembling the battery cell 10 onto the support plate 21, thereby reducing the assembly difficulty of the battery device 100. The first side wall plate 22 and the second side wall plate 32 do not contact each other, and a clamp is placed between the first side wall plate 22 and the second side wall plate 32. The first sealing element 50 allows the first side wall panel 22 and the second side wall panel 32 to indirectly abut against each other via the first sealing element 50. The first locking element 60 passes through the first sealing element 50 and connects the first side wall panel 22 and the second side wall panel 32, so that the first side wall panel 22 and the second side wall panel 32 are locked together by the first locking element 60 and abut against the first sealing element 50. This allows the first side wall panel 22 and the second side wall panel 32 to be assembled and connected, while also providing a certain buffering and separating effect between the first side wall panel 22 and the second side wall panel 32 through the first sealing element 50. This allows the first sealing element 50 to absorb and release the stress generated by the deformation of the first housing body 20 during use, thereby reducing the stress transmitted from the first side wall plate 22 of the first housing body 20 to the second side wall plate 32 of the second housing body 30. This, in turn, reduces the stress on the top plate 31 of the second housing body 30, alleviating the deformation or bulging of the top plate 31 of the second housing body 30 during use. This helps to extend the service life of the battery device 100 and reduces safety hazards during use, thereby improving the service life and reliability of the battery device 100.

[0181] According to some embodiments of this application, see Figure 7 As shown, the thickness of the first seal 50 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0182] It should be noted that the thickness of the first sealing element 50, after being assembled between the first side wall plate 22 and the second side wall plate 32 and locked by the first locking element 60, is greater than or equal to 0.5 mm and less than or equal to 5 mm. Figure 7 In the first sealing element 50, the thickness is T1, which satisfies 0.5mm≤T1≤5mm.

[0183] For example, the thickness T1 of the first seal 50 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, or 5mm, etc.

[0184] In this embodiment, setting the thickness of the first sealing member 50 to be greater than or equal to 0.5 mm can improve the relative floating size of the first side wall plate 22 and the second side wall plate 32, thereby improving both the sealing effect of the first sealing member 50 on the gap between the first side wall plate 22 and the second side wall plate 32 and the buffering effect of the first sealing member 50 between the first side wall plate 22 and the second side wall plate 32. On the other hand, setting the thickness of the first sealing member 50 to be less than or equal to 5 mm can alleviate the phenomenon that the first sealing member 50 occupies too much space between the first side wall plate 22 and the second side wall plate 32, thereby improving the volumetric energy density of the battery device 100 and optimizing the gap size between the first side wall plate 22 and the second side wall plate 32, so as to reduce the difficulty of the first sealing member 50 sealing the gap between the first side wall plate 22 and the second side wall plate 32.

[0185] In some embodiments, please continue to see Figure 7 As shown, the thickness of the first seal 50 is greater than or equal to 1.5 mm and less than or equal to 3.5 mm, that is, 1.5 mm ≤ T1 ≤ 3.5 mm.

[0186] In this embodiment, on the one hand, setting the thickness of the first sealing member 50 to be greater than or equal to 1.5 mm can further improve the relative floating size of the first side wall plate 22 and the second side wall plate 32, thereby further improving the sealing effect of the first sealing member 50 on the gap between the first side wall plate 22 and the second side wall plate 32, and further improving the buffering effect of the first sealing member 50 between the first side wall plate 22 and the second side wall plate 32. On the other hand, setting the thickness of the first sealing member 50 to be less than or equal to 3.5 mm can further alleviate the phenomenon of the first sealing member 50 occupying too much space between the first side wall plate 22 and the second side wall plate 32, thereby further improving the volumetric energy density of the battery device 100 and further optimizing the gap size between the first side wall plate 22 and the second side wall plate 32, so as to further reduce the difficulty of the first sealing member 50 sealing the gap between the first side wall plate 22 and the second side wall plate 32.

[0187] According to some embodiments of this application, see Figure 7 As shown, the first locking member 60 may include a first locking part 61 and a first limiting part 62. Along the axial direction of the first locking part 61, the first locking part 61 passes through the second side wall plate 32 and the first sealing member 50 and is locked onto the first side wall plate 22. The first limiting part 62 is connected to one end of the first locking part 61 and abuts against the side of the second side wall plate 32 away from the first sealing member 50.

[0188] The first locking part 61 of the first locking member 60 is a structure that passes through the second side wall plate 32 and the first seal 50 in sequence along the axial direction of the first locking part 61 and is connected to the first side wall plate 22. The first limiting part 62 of the first locking member 60 is a structure that abuts against the side of the second side wall plate 32 away from the first seal 50 along the axial direction of the first locking part 61, so as to connect the first side wall plate 22 and the second side wall plate 32 to each other and clamp the first seal 50 through the first locking member 60.

[0189] For example, the first locking member 60 is a bolt, and correspondingly, the first locking part 61 is provided with an external thread that is screwed into the first side wall plate 22. The first side wall plate 22 has a mating part 221 that is screwed into the first locking part 61, and the mating part 221 is provided with a threaded hole that is threaded into the external thread of the first locking part 61.

[0190] For example, the first side wall panel 22 and the second side wall panel 32 are stacked along the second direction Y, and the first sealing member 50 is disposed between the first side wall panel 22 and the second side wall panel 32 in the second direction Y. Correspondingly, the axial direction of the first locking part 61 is parallel to the second direction Y.

[0191] In this embodiment, the first locking member 60 is provided with a first locking part 61 locked onto the first side wall plate 22 and a first limiting part 62 connected to one end of the first locking part 61. By inserting the first locking part 61 into the first sealing member 50 and the second side wall plate 32, and by placing the first limiting part 62 against the side of the second side wall plate 32 away from the first sealing member 50, the first locking part 61 and the first limiting part 62 locked onto the first side wall plate 22 can cooperate to clamp the first sealing member 50 and the second side wall plate 32 between the first side wall plate 22 and the first limiting part 62, so as to realize the assembly connection between the first side wall plate 22 and the second side wall plate 32 and the clamping of the first sealing member 50 by the first side wall plate 22 and the second side wall plate 32.

[0192] According to some embodiments of this application, please refer to Figure 7 As shown, the second sidewall panel 32 is provided with a first through hole 3221 through which the first locking part 61 passes. The first locking part 61 has a first part 611 that passes through the first through hole 3221. The first limiting part 62 is connected to the first part 611. The diameter of the first part 611 is smaller than the diameter of the first through hole 3221.

[0193] Wherein, the first through hole 3221 is a structure that penetrates the second side wall plate 32 along the axial direction of the first locking part 61. In the embodiment where the first side wall plate 22 and the second side wall plate 32 are stacked along the second direction Y, the axial direction of the first locking part 61 is parallel to the second direction Y. Correspondingly, the first through hole 3221 penetrates the second side wall plate 32 along the second direction Y.

[0194] The first part 611 is the portion of the first locking part 61 that passes through the first through hole 3221, and in Figure 7 In the middle, the first part 611 is also inserted inside the first sealing element 50.

[0195] The diameter of the first part 611 is smaller than the diameter of the first through hole 3221. That is to say, the first part 611 of the first locking part 61 located in the first through hole 3221 and the hole wall of the first through hole 3221 have a clearance fit structure.

[0196] In this embodiment, by setting the outer diameter of the first portion 611 of the first locking part 61 located in the first through hole 3221 of the second side wall plate 32 to be smaller than the diameter of the first through hole 3221, the first portion 611 of the first locking part 61 and the second side wall plate 32 are in a clearance fit structure, so that the second side wall plate 32 has the ability to float relative to the first locking member 60 during use. Since the first locking member 60 is a structure locked to the first side wall plate 22, the second side wall plate 32 has the ability to float relative to the first side wall plate 22 during use, thereby alleviating the pulling or twisting caused by the first side wall plate 22 and the first locking member 60 on the second side wall plate 32, which is beneficial to further reduce the stress influence on the second box body 30 during use.

[0197] In some embodiments, see Figure 7 As shown, the difference between the diameter of the first part 611 and the diameter of the first through hole 3221 is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0198] Among them, Figure 7 In the first through hole 3221, the diameter is φ1, and the diameter of the first part 611 is φ2. That is, φ1 and φ2 satisfy 0.2mm≤φ1-φ2≤3mm.

[0199] For example, the difference between the diameter of the first portion 611 and the diameter of the first through hole 3221 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0200] In this embodiment, on the one hand, setting the difference between the outer diameter of the first portion 611 of the first locking part 61 and the diameter of the first through hole 3221 to be greater than or equal to 0.2 mm can improve the gap size between the first portion 611 of the first locking part 61 and the hole wall surface of the first through hole 3221, thereby improving the ability of the second side wall plate 32 to float relative to the first locking member 60 during use, so as to further alleviate the pulling or twisting caused by the first side wall plate 22 and the first locking member 60 on the second side wall plate 32. On the other hand, setting the difference between the outer diameter of the first portion 611 of the first locking part 61 and the diameter of the first through hole 3221 to be less than or equal to 3 mm can alleviate the phenomenon that the assembly difficulty between the first locking member 60 and the second side wall plate 32 is too large due to the excessive gap between the first portion 611 of the first locking part 61 and the hole wall surface of the first through hole 3221, and can optimize the difference between the outer diameter of the first limiting part 62 and the first locking part 61 of the first locking member 60, which is beneficial to reducing the molding difficulty of the first locking member 60.

[0201] According to some embodiments of this application, see Figure 7 As shown, along the axial direction of the first locking part 61, the first limiting part 62 has a first abutting surface 621 that abuts against the second side wall plate 32, and the orthographic projection of the hole wall surface of the first through hole 3221 in the axial direction of the first locking part 61 is located in the first abutting surface 621.

[0202] The first abutting surface 621 is the surface of the first limiting part 62 facing the second side wall plate 32 and abutting against the second side wall plate 32 on the axial direction of the first locking part 61. The orthographic projection of the hole wall surface of the first through hole 3221 on the axial direction of the first locking part 61 is located in the first abutting surface 621. That is, in the projection plane perpendicular to the axial direction of the first locking part 61, the orthographic projection of the hole wall surface of the first through hole 3221 is located in the orthographic projection of the first abutting surface 621. Correspondingly, in the projection plane perpendicular to the axial direction of the first locking part 61, the orthographic projection of the outer peripheral surface of the first limiting part 62 surrounds the outside of the orthographic projection of the hole wall surface of the first through hole 3221.

[0203] In this embodiment, by setting the orthogonal projection of the hole wall of the first through hole 3221 on the axial direction of the first locking part 61 to be located within the first abutting surface 621, the outer edge of the first limiting part 62 is abutted against the second side wall plate 32, thereby improving the stability and reliability of the mutual abutment between the first limiting part 62 and the second side wall plate 32, and further improving the stability and reliability of the first locking member 60 connecting the first side wall plate 22 and the second side wall plate 32.

[0204] According to some embodiments of this application, please continue to refer to Figure 7As shown, the first locking portion 61 may include a first part 611 and a second part 612. The second part 612 and the first limiting part 62 are respectively connected to the two ends of the first part 611 in the axial direction of the first locking portion 61. The diameter of the first part 611 is larger than the diameter of the second part 612. Along the axial direction of the first locking portion 61, the first part 611 passes through the second side wall plate 32 and the first seal 50, and the first part 611 abuts against the surface of the first side wall plate 22 facing the first seal 50. The second part 612 is locked onto the first side wall plate 22.

[0205] The second part 612 and the first limiting part 62 are respectively connected to the two ends of the first part 611 in the axial direction of the first locking part 61. That is, in the axial direction of the first locking part 61, the first part 611 is the structure of the first locking part 61 connected between the second part 612 and the first limiting part 62, and the first part 611 is the part of the first locking part 61 that passes through the second side wall plate 32 and the first sealing member 50, and the second part 612 is the part of the first locking part 61 that is mutually locked and connected with the first side wall plate 22.

[0206] The diameter of the first part 611 is greater than the diameter of the second part 612, that is, the outer diameter of the first part 611 is greater than the outer diameter of the second part 612. Correspondingly, in the projection plane perpendicular to the axial direction of the first locking part 61, the orthographic projection of the second part 612 is located within the orthographic projection of the first part 611.

[0207] The first part 611 abuts against the surface of the first side wall plate 22 facing the first seal 50, that is, the first part 611 and the first side wall plate 22 abut against each other along the axial direction of the first locking part 61. In the embodiment where the first side wall plate 22 is provided with a mating part 221, the first part 611 and the mating part 221 abut against each other along the axial direction of the first locking part 61.

[0208] In this embodiment, by setting the outer diameter of the first portion 611, which is inserted into the first sealing member 50 and the second side wall plate 32, to be larger than the outer diameter of the second portion 612, which is locked between the first locking portion 61 and the first side wall plate 22, and by setting the first portion 611 to abut against the surface of the first side wall plate 22 facing the first sealing member 50 along the axial direction of the first locking portion 61, the first portion 611 can also limit the second portion 612 along the axial direction of the first locking portion 61 when the second portion 612 is locked with the first side wall plate 22. Thus, the cooperation between the first portion 611 and the second portion 612 can improve the stability of the first locking portion 61 locked on the first side wall plate 22, thereby improving the reliability of the connection between the first locking portion 61 and the first side wall plate 22.

[0209] In some embodiments, see Figure 7As shown, the first locking part 61 is screwed to the first side wall plate 22. That is, the first locking part 61 is provided with external threads, the first side wall plate 22 is provided with threaded holes, and the first locking part 61 and the first side wall plate 22 are threadedly engaged. It should be noted that in the embodiment where the first locking part 61 includes a first part 611 and a second part 612, the first part 611 is screwed to the first side wall plate 22, that is, the first part 611 is provided with external threads.

[0210] In this embodiment, by setting the first locking part 61 of the first locking member 60 to be screwed onto the first side wall plate 22, the first locking member 60 and the first side wall plate 22 are locked together by a threaded connection. With this structure, the locking force between the first side wall plate 22 and the second side wall plate 32 and the clamping force on the first seal 50 can be adjusted by adjusting the threading depth between the first locking part 61 and the first side wall plate 22, so as to meet different usage requirements. Moreover, this structure facilitates the assembly and disassembly of the first side wall plate 22 and the second side wall plate 32.

[0211] According to some embodiments of this application, see Figure 4 , Figure 7 and Figure 8 As shown, the second side wall panel 32 may include a body portion 321 and a first flange edge 322. Along the first direction X, one end of the body portion 321 is connected to the top plate 31, and the first flange edge 322 is connected to the end of the body portion 321 away from the top plate 31. The first flange edge 322 and the first side wall panel 22 are stacked, and the first sealing member 50 is disposed between the first flange edge 322 and the first side wall panel 22. The first locking member 60 passes through the first sealing member 50 and locks the first side wall panel 22 and the first flange edge 322. The wall thickness of the first flange edge 322 is greater than the wall thickness of the body portion 321.

[0212] In this embodiment, the main body 321 is the portion where the second side wall panel 32 is connected to the top plate 31, while the first flange edge 322 is the portion where the second side wall panel 32 and the first side wall panel 22 are connected to each other via the first locking member 60. The main body 321 and the first flange edge 322 are arranged and connected along the first direction X. It should be noted that in the embodiment where the second side wall panel 32 has a first through hole 3221 and the first locking member 60 passes through the first through hole 3221, the first through hole 3221 is a structure located on the first flange edge 322.

[0213] The first flange edge 322 and the first side wall plate 22 are stacked and arranged, and the first sealing member 50 is disposed between the first flange edge 322 and the first side wall plate 22. That is, the first flange edge 322 and the first side wall plate 22 are stacked and arranged along the thickness direction of the first flange edge 322, and the first sealing member 50 is sandwiched between the first flange edge 322 and the first side wall plate 22. Correspondingly, the first locking member 60 is a structure that passes through the first flange edge 322 and connects the first flange edge 322 to the first side wall plate 22. In the embodiment where the first locking member 60 includes a first limiting part 62 and the first limiting part 62 abuts against the side of the second side wall plate 32 away from the first sealing member 50, then the first limiting part 62 is a structure that abuts against the side of the first flange edge 322 away from the first sealing member 50.

[0214] For example, in Figure 7 In this structure, the first flange edge 322 and the first side wall plate 22 are stacked along the second direction Y. Correspondingly, the wall thickness of the first flange edge 322 is greater than the wall thickness of the body part 321, which means that the thickness dimension of the first flange edge 322 in the second direction Y is greater than the thickness dimension of the body part 321 in the second direction Y.

[0215] In this embodiment, by setting the wall thickness of the first flange edge 322 of the second side wall panel 32 to be greater than the wall thickness of the body portion 321 of the second side wall panel 32, the area of ​​the second side wall panel 32 that is connected to the first side wall panel 22 is a region with increased thickness. This can improve the structural strength of the area where the second side wall panel 32 is connected to the first side wall panel 22, thereby reducing the risk of deformation or cracking of the second side wall panel 32 at the location where it is connected to the first side wall panel 22.

[0216] According to some embodiments of this application, see Figure 6 As shown, the battery device 100 may also include a buffer 70, which is disposed between the second side wall panel 32 and the battery cell 10.

[0217] The buffer 70 is a structure that is supported between the second side wall plate 32 and the battery cell 10 and serves to absorb the stress on the second side wall plate 32. For example, the material of the buffer 70 can be foam or rubber.

[0218] In this embodiment, by providing a buffer 70 between the second side wall panel 32 and the battery cell 10, the buffer 70 can absorb at least a portion of the stress generated on the first housing body 20 during the process of transmitting the stress to the top plate 31 through the second side wall panel 32, thereby reducing the stress impact on the top plate 31 and further alleviating the deformation or bulging of the top plate 31 of the second housing body 30 during use.

[0219] In some embodiments, please continue to see Figure 6 As shown, the buffer 70 is supported between the second side wall panel 32 and the battery cell 10, and the second side wall panel 32 bulges in the direction away from the battery cell 10. That is, the buffer 70 is a structure that is pressed between the second side wall panel 32 and the battery cell 10, and the buffer 70 can provide the second side wall panel 32 with a supporting force away from the battery cell 10, so as to arch the second side wall panel 32 in the direction away from the battery cell 10 along the second direction Y.

[0220] In this embodiment, by setting the buffer 70 as a structure that supports the second side wall panel 32 and the battery cell 10 and lifts the second side wall panel 32 away from the battery cell 10, the buffer 70 can better absorb the stress on the second side wall panel 32, and the second side wall panel 32 is a pre-deformed structure so that at least part of the stress can be released on the second side wall panel 32, thereby further reducing the stress on the top plate 31 and further alleviating the deformation or bulging of the top plate 31 of the second box body 30 during use.

[0221] According to some embodiments of this application, please refer to Figure 9 and Figure 10 , Figure 9 A cross-sectional view of the second housing body 30 of the battery device 100 provided in other embodiments of this application, perpendicular to the third direction Z. Figure 10 for Figure 9 The diagram shows a partial enlarged view of point B on the second housing body 30. Along the first direction X, at least a portion of the top plate 31 bulges towards the battery cell 10 to form a recessed area 311 on the side of the top plate 31 facing away from the battery cell 10. In other words, the top plate 31 is a structure that deforms and arches at least partly towards the battery cell 10 in the first direction X, forming a convex structure on the side of the top plate 31 facing the battery cell 10 and a recessed area 311 on the side of the top plate 31 facing away from the battery cell 10.

[0222] In this embodiment, by setting at least a portion of the top plate 31 to bulge towards the battery cell 10, the side of the top plate 31 facing away from the battery cell 10 in the first direction X is recessed towards the battery cell 10 and forms a pre-deformed structure. This reduces the bulging phenomenon or bulging amplitude of the top plate 31 to a certain extent when it is subjected to bending moment or stress during use and bulges in the direction away from the battery cell 10 along the first direction X.

[0223] According to some embodiments of this application, refer to Figure 9 and Figure 10 Please refer to further details. Figure 11 , Figure 12 and Figure 13 , Figure 11 This is a schematic diagram of the structure of the second housing body 30 of the battery device 100 provided in some embodiments of this application. Figure 12 A cross-sectional view of the second housing body 30 of the battery device 100 provided in some embodiments of this application, perpendicular to the third direction Z. Figure 13 The second housing body 30 of the battery device 100 provided in some other embodiments of this application is a cross-sectional view perpendicular to the third direction Z. The top plate 31 is provided with a reinforcing part 312, which is configured to enhance the bending strength of the top plate 31.

[0224] The top plate 31 is provided with a reinforcing part 312, which is configured to enhance the bending strength of the top plate 31. In other words, the top plate 31 has a structure in which a portion of the top plate 31 is provided with the reinforcing part 312, making the area of ​​the top plate 31 with the reinforcing part 312 an area with enhanced bending strength, thereby increasing the overall bending strength of the top plate 31. It should be noted that the reinforcing part 312 and the top plate 31 can be an integrally formed structure, that is, the reinforcing part 312 is part of the top plate 31. Alternatively, the reinforcing part 312 and the top plate 31 can be separate structures, that is, the reinforcing part 312 is a component connected to the top plate 31.

[0225] In this embodiment, by providing a reinforcing part 312 on the top plate 31 of the second box body 30, and the reinforcing part 312 can enhance the bending strength of the top plate 31, the top plate 31 of the second box body 30 is a structure in which the bending strength of at least a part of the area is enhanced. The second box body 30 with this structure can enhance the ability of the top plate 31 of the second box body 30 to resist the stress transmitted to the second box body 30 by the first box body 20, thereby further alleviating the deformation or bulging of the top plate 31 of the second box body 30 under stress during use, which is conducive to further extending the service life of the battery device 100 and further reducing the safety hazards of the battery device 100 during use, which is conducive to further improving the service life and reliability of the battery device 100.

[0226] In some embodiments, see Figure 11 and Figure 12 as well as Figure 13 As shown, the reinforcing part 312 is integrally formed with the top plate 31, and the reinforcing part 312 protrudes from the surface of one side of the top plate 31 along the first direction X.

[0227] The reinforcing part 312 is integrally formed with the top plate 31, that is, the reinforcing part 312 is part of the top plate 31. Correspondingly, if the second box body 30 is made of metal, the reinforcing part 312 and the top plate 31 can be manufactured by integral forming process such as extrusion molding, stamping molding or casting. If the second box body 30 is made of non-metallic material, the reinforcing part 312 and the top plate 31 can be manufactured by integral forming process such as injection molding.

[0228] Along the first direction X, the reinforcing part 312 protrudes from the surface of one side of the top plate 31, that is, the reinforcing part 312 is a structure connected to the surface of one side of the top plate 31 in the first direction X.

[0229] Optionally, see Figure 11 and Figure 12 As shown, the reinforcing part 312 may protrude from the surface of the top plate 31 on the side opposite to the supporting plate 21. Of course, see also... Figure 13 As shown, the reinforcing part 312 can also be a protrusion on the surface of the top plate 31 facing the supporting plate 21. Similarly, in Figure 13 In the first direction X, it can also be a structure in which the surface of the top plate 31 opposite to the reinforcing part 312 has a groove 313 formed at the position corresponding to the reinforcing part 312.

[0230] In some embodiments, see Figure 11 As shown, the top plate 31 may be provided with multiple reinforcing parts 312. It should be noted that the multiple reinforcing parts 312 provided on the top plate 31 may be arranged at intervals or may be interconnected.

[0231] The plurality of reinforcing parts 312 may include a first reinforcing part 3121 and a second reinforcing part 3122. The first reinforcing part 3121 and the second reinforcing part 3122 are intersected and connected. That is, the extending direction of the first reinforcing part 3121 and the extending direction of the second reinforcing part 3122 are arranged at a non-zero angle or a right angle, and the first reinforcing part 3121 and the second reinforcing part 3122 are connected to each other.

[0232] Optionally, the first reinforcing part 3121 extends along the second direction Y, and the second reinforcing part 3122 extends along the third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. That is, the extension direction of the first reinforcing part 3121 and the extension direction of the second reinforcing part 3122 are set at right angles.

[0233] For example, in Figure 11In this embodiment, there are multiple second reinforcing portions 3122, which are spaced apart along the second direction Y, and the first reinforcing portions 3121 extend along the second direction Y and are connected to all of the multiple second reinforcing portions 3122. Alternatively, in other embodiments, there may be multiple first reinforcing portions 3121, which are spaced apart. Correspondingly, the multiple first reinforcing portions 3121 are arranged at intervals along the third direction Z, and the second reinforcing portions 3122 extend along the third direction Z and are connected to all of the multiple first reinforcing portions 3121.

[0234] In this embodiment, by providing a reinforcing part 312 protruding on the surface of the top plate 31 along the first direction X, the area of ​​the top plate 31 with the reinforcing part 312 is a region with enhanced bending strength. The structure is simple and easy to implement. Furthermore, by setting the reinforcing part 312 and the top plate 31 as an integrally formed structure, the connection stability and reliability between the reinforcing part 312 and the top plate 31 can be effectively improved. This helps to reduce the risk of the reinforcing part 312 detaching from the top plate 31 during use. Moreover, this integrally formed structure can better enhance the bending strength of the top plate 31 through the reinforcing part 312.

[0235] In some embodiments, see Figure 9 and Figure 10 As shown, the reinforcing part 312 and the top plate 31 are separately provided. The reinforcing part 312 is embedded in the top plate 31, and the rigidity of the reinforcing part 312 is greater than that of the top plate 31.

[0236] The reinforcing part 312 and the top plate 31 are separately provided. The reinforcing part 312 is embedded in the top plate 31. That is to say, the reinforcing part 312 and the top plate 31 are two independent components, and the top plate 31 is a structure that covers at least part of the outer side of the reinforcing part 312.

[0237] For example, in Figure 10 In the middle, the reinforcing part 312 is a structure that is integrally embedded in the top plate 31. Correspondingly, the body layer 314 and the connecting layer 315 together cover the reinforcing part 312. That is to say, the top plate 31 is a structure that covers the outside of the reinforcing part 312.

[0238] The stiffness of the reinforcing part 312 is greater than that of the top plate 31. In other words, the reinforcing part 312 has a greater ability to resist deformation when subjected to force than the top plate 31. It should be noted that, in the embodiments of this application, the stiffness of the reinforcing part 312 being greater than that of the top plate 31 means that the stiffness of the material of the reinforcing part 312 is greater than that of the material of the top plate 31. For example, the material of the reinforcing part 312 can be a metal material such as steel or aluminum alloy, and correspondingly, the material of the top plate 31 can be a polymer composite material such as glass fiber reinforced plastic or polyvinylidene fluoride. In measuring the stiffness of the material of the reinforcing part 312 and the top plate 31, two specimens of the same shape and size can be made first. One specimen is made of the same material as the reinforcing part 312, and the other specimen is made of the same material as the top plate 31. Then, the deformation of the two specimens is measured by the three-point bending method in the static method, and the stiffness of each specimen is calculated. Thus, the stiffness of the material of the reinforcing part 312 and the top plate 31 can be obtained.

[0239] Optionally, please continue to see Figure 9 and Figure 10 As shown, the top plate 31 may include a body layer 314 and a connecting layer 315. The body layer 314 and the connecting layer 315 are stacked and connected along the first direction X. The body layer 314 is connected to the second side wall plate 32. The reinforcing part 312 is disposed between the body layer 314 and the connecting layer 315.

[0240] The top plate 31 is a double-layer structure in which the body layer 314 and the connecting layer 315 are stacked and connected in the first direction X. Correspondingly, the reinforcing part 312 is sandwiched between the body layer 314 and the connecting layer 315 so that the reinforcing part 312 is embedded in the top plate 31.

[0241] Optionally, the body layer 314 and the connecting layer 315 are made of the same material, and the connection structure between the body layer 314 and the connecting layer 315 can be various, such as adhesive bonding or hot-melt bonding.

[0242] For example, in this embodiment of the application, the body layer 314 of the top plate 31 and the second side wall plate 32 are integrally formed.

[0243] In this embodiment, by embedding a stiffer reinforcing part 312 inside the top plate 31, the stiffening part 312 can enhance the stiffness of the top plate 31 in this area, thereby enhancing the bending strength and deformation resistance of the top plate 31. The structure is simple, and the stiffening part 312 with different stiffness can be replaced according to different usage requirements.

[0244] According to some embodiments of this application, see Figure 4 and Figure 8 As shown, the top plate 31 and the second side wall plate 32 are integrally formed.

[0245] For example, in the embodiments of this application, the top plate 31 and the second side wall plate 32 of the second box body 30 are integral structures formed by injection molding.

[0246] It should be noted that in the embodiment where the top plate 31 includes a body layer 314 and a connecting layer 315, the second side wall plate 32 is integrally formed with the body layer 314 of the top plate 31.

[0247] In this embodiment, by setting the top plate 31 and the second side wall plate 32 of the second box body 30 as an integrally formed structure, the connection stability and reliability between the top plate 31 and the second side wall plate 32 are improved, thereby improving the overall structural strength of the second box body 30.

[0248] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, the first box body 20 may include two first side wall panels 22 arranged opposite each other along the second direction Y, and the second box body 30 may include two second side wall panels 32 arranged opposite each other along the second direction Y, with each second side wall panel 32 connected to one of the first side wall panels 22. The first box body 20 may also include two third side wall panels 23 arranged opposite each other along the third direction Z, with both third side wall panels 23 connected to the side of the support plate 21 facing the top plate 31. The two third side wall panels 23 are located at both ends of the second box body 30 in the third direction Z, and the top plate 31 and the two second side wall panels 32 are all connected to the third side wall panels 23. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0249] The two second sidewalls 32 of the second box body 30 are respectively connected to the two ends of the top plate 31 in the second direction Y, so that the cross section of the second box body 30 perpendicular to the third direction Z has a "U" shape and the two ends of the second box body 30 in the third direction Z are open. Correspondingly, the two third sidewalls 23 of the first box body 20 are respectively used to block the two ends of the second box body 30 in the third direction Z. That is, the third sidewall 23 connected to the side of the bearing plate 21 facing the top plate 31 is connected to both the top plate 31 and the two second sidewalls 32, so that the cross section of the first box body 20 perpendicular to the second direction Y also has a "U" shape.

[0250] For example, the third sidewall panel 23 protrudes beyond the bearing surface 211 in the first direction X by a larger dimension than the first sidewall panel 22 protrudes beyond the bearing surface 211 in the first direction X.

[0251] In this embodiment, the first box body 20 includes two first side wall panels 22 arranged opposite each other along the second direction Y, and the second box body 30 includes two second side wall panels 32 arranged opposite each other along the second direction Y. Each second side wall panel 32 is connected to one of the first side wall panels 22 to realize the mutual connection between the two sides of the first box body 20 and the second box body 30 in the second direction Y. The first box body 20 also includes two third side wall panels 23 arranged at both ends of the top plate 31 along the third direction Z. Each third side wall panel 23 is connected to the top plate 31 and the two second side wall panels 32 of the second box body 30 to realize the mutual connection between the two sides of the first box body 20 and the second box body 30 in the third direction Z. This enables the assembly connection between the first box body 20 and the second box body 30 and jointly defines the assembly space 40a for accommodating the battery cell 10. The structure is simple and easy to assemble.

[0252] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 7 As shown, the second sidewall panel 32 has a first flange edge 322 connected to the first sidewall panel 22 at the end away from the top plate 31 in the first direction X. The thickness direction of the first flange edge 322 is parallel to the second direction Y, and the first flange edge 322 and the first sidewall panel 22 are stacked along the second direction Y. The first sealing member 50 is disposed between the first flange edge 322 and the first sidewall panel 22, and the first locking member 60 passes through the first sealing member 50 and locks the first flange edge 322 and the first sidewall panel 22.

[0253] The thickness direction of the first flange edge 322 is parallel to the second direction Y, and the first flange edge 322 and the first side wall plate 22 are stacked along the second direction Y. Correspondingly, the axial direction of the first locking part 61 of the first locking member 60 is parallel to the second direction Y, and the first locking part 61 is a structure that passes through the first flange edge 322 and the first sealing member 50 in sequence along the second direction Y and is then locked onto the first side wall plate 22.

[0254] It should be noted that in embodiments where the wall thickness of the first flange edge 322 of the second side wall panel 32 is greater than the wall thickness of the body portion 321 of the second side wall panel 32, the thickness dimension of the first flange edge 322 in the second direction Y is greater than the thickness dimension of the body portion 321 in the second direction Y.

[0255] In this embodiment, by setting the first flange edge 322, which connects the second side wall panel 32 to the first side wall panel 22, to be stacked and connected to the first side wall panel 22, the stacking direction of the first flange edge 322 and the first side wall panel 22 is consistent with the thickness direction of the first flange edge 322 and the same as the arrangement direction of the two first side wall panels 22. This reduces the difficulty of the first locking member 60 locking the first side wall panel 22 and the second side wall panel 32, and also reduces the difficulty of clamping the first sealing member 50 between the first side wall panel 22 and the second side wall panel 32, thereby reducing the assembly difficulty of the battery device 100.

[0256] In some embodiments, see Figure 7 As shown, along the second direction Y, the first sidewall panel 22 is located on the side of the first flange edge 322 facing the assembly space 40a. That is, the two first sidewall panels 22 of the first box body 20 are located between the two second sidewall panels 32 of the second box body 30 in the second direction Y.

[0257] In the embodiment where the first flange edge 322 of the second side wall plate 32 is screwed onto the first side wall plate 22 by the first locking member 60, the assembly difficulty of screwing the first locking member 60 and the first side wall plate 22 together can be reduced by setting the first side wall plate 22 to be located on the side of the first flange edge 322 facing the assembly space 40a in the second direction Y.

[0258] In this embodiment, by setting the first side wall panel 22 to be located on the side of the first flange edge 322 facing the assembly space 40a in the second direction Y, the two first side wall panels 22 of the first box body 20 are located between the two second side wall panels 32 in the second direction Y, so that the second side wall panel 32 with a larger size in the first direction X is located outside the two first side wall panels 22 in the second direction Y. This facilitates the second side wall panel 32 to cover the first side wall panel 22 and helps to reduce the assembly difficulty between the first side wall panel 22 and the second side wall panel 32.

[0259] According to some embodiments of this application, in conjunction with Figure 3 , Figure 4 and Figure 5 As shown, the second box body 30 has second flange edges 33 at both ends in the third direction Z, and the second flange edges 33 connect the top plate 31 and the two second side wall plates 32. The two ends of the third side wall plate 23 in the second direction Y and the end of the third side wall plate 23 away from the bearing plate 21 in the first direction X are both connected to the second flange edges 33.

[0260] The second box body 30 has two second flange edges 33 at both ends in the third direction Z. The second flange edges 33 connect the top plate 31 and the two second side wall plates 32. That is, the second box body 30 also includes two second flange edges 33 arranged at intervals in the third direction Z. The top plate 31 and the second side wall plates 32 are both located between the two second flange edges 33 in the third direction Z. The two ends of the top plate 31 in the third direction Z are respectively connected to the two second flange edges 33, and the two ends of the second side wall plates 32 in the third direction Z are respectively connected to the two second flange edges 33, so that one second flange edge 33 has a structure that connects to one end of the top plate 31 and one end of the two second side wall plates 32 at the same time.

[0261] In this embodiment, by providing a second flange edge 33 on the second box body 30 to connect the top plate 31 and the two second side wall plates 32, and by having both ends of the third side wall plate 23 in the second direction Y and the end of the third side wall plate 23 away from the bearing plate 21 in the first direction X connected to the second flange edge 33, the third side wall plate 23 is a structure that is interconnected with the top plate 31 and the two second side wall plates 32 of the second box body 30 through the second flange edge 33, thereby reducing the assembly difficulty between the third side wall plate 23 and the second box body 30.

[0262] According to some embodiments of this application, refer to Figure 2 Please refer to further details. Figure 14 and Figure 15 , Figure 14 This is a cross-sectional view of a battery device 100 provided in some embodiments of this application, perpendicular to the second direction Y. Figure 15 for Figure 14 The diagram shows a partial enlarged view of point C in the battery assembly 100. The third sidewall panel 23 and the second flange edge 33 do not contact each other, and a second seal 80 is sandwiched between the third sidewall panel 23 and the second flange edge 33. The battery assembly 100 may also include a second locking member 90, which passes through the second seal 80 and locks the third sidewall panel 23 and the second flange edge 33 to connect the third sidewall panel 23 and the second flange edge 33.

[0263] The third side wall panel 23 and the second flange edge 33 do not contact each other, and a second sealing element 80 is sandwiched between the third side wall panel 23 and the second flange edge 33. That is to say, the third side wall panel 23 and the second flange edge 33 do not directly abut against each other, but the third side wall panel 23 and the second flange edge 33 are indirectly abutted against each other through the second sealing element 80. In other words, the third side wall panel 23 abuts against the second flange edge 33 through the second sealing element 80. Correspondingly, the third side wall panel 23 and the second flange edge 33 are arranged at intervals, and the second sealing element 80 is disposed between the third side wall panel 23 and the second flange edge 33 and separates the third side wall panel 23 and the second flange edge 33.

[0264] For example, the material of the second seal 80 can be various, such as rubber, plastic or silicone.

[0265] The battery device 100 also includes a second locking member 90, which passes through the second seal 80 and locks the third side wall plate 23 and the second flange edge 33, so that the second locking member 90 serves to connect the third side wall plate 23 and the second flange edge 33. The structure of the second locking member 90 can be various, such as bolts or rivets. For example, in... Figure 15 In the middle, the second locking member 90 is a bolt, which passes through the second flange edge 33 and the second sealing member 80 in sequence and is screwed onto the third side wall plate 23.

[0266] For example, in Figure 15 In the middle, the third side wall plate 23 and the second flange edge 33 are provided with threaded holes on the surface of the end facing each other, so that the second locking member 90 is threadedly engaged with the threaded hole of the third side wall plate 23. Of course, in other embodiments, the third side wall plate 23 may also be provided with a rivet nut or other structure.

[0267] In this embodiment, the third sidewall panel 23 and the second flange edge 33 do not contact each other, and a second sealing element 80 is sandwiched between the third sidewall panel 23 and the second flange edge 33, so that the third sidewall panel 23 and the second flange edge 33 are indirectly abutted by the second sealing element 80. The second locking element 90 passes through the second sealing element 80 and connects the third sidewall panel 23 and the second flange edge 33, so that the third sidewall panel 23 and the second flange edge 33 are locked by the second locking element 90 and abut against the second sealing element 80. Thus, while achieving mutual assembly and connection of the third sidewall panel 23 and the second flange edge 33, the second sealing element 80 can also be used to secure the third sidewall panel 23 and the second flange edge 33. The three sides of the first box body 20 act as a buffer and separator, allowing the second seal 80 to absorb and release the stress generated by the deformation of the first box body 20 during use. This reduces the stress transmitted from the third side wall plate 23 of the first box body 20 to the second flange edge 33 of the second box body 30, thereby further reducing the stress on the top plate 31 of the second box body 30. This further alleviates the deformation or bulging of the top plate 31 of the second box body 30 during use, which helps to extend the service life of the battery device 100 and further reduces the safety hazards of the battery device 100 during use, thus further improving the service life and reliability of the battery device 100.

[0268] According to some embodiments of this application, see Figure 15 As shown, the thickness of the second seal 80 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0269] It should be noted that the thickness of the second sealing element 80, after being assembled between the third side wall plate 23 and the second flange edge 33 and locked by the second locking element 90, is greater than or equal to 0.5 mm and less than or equal to 5 mm. Figure 15 In the middle, the thickness of the second seal 80 is T2, which satisfies 0.5mm≤T2≤5mm.

[0270] For example, the thickness T2 of the second seal 80 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, or 5mm, etc.

[0271] In this embodiment, setting the thickness of the second seal 80 to be greater than or equal to 0.5 mm can improve the relative floating size of the third side wall plate 23 and the second flange edge 33. This can improve both the sealing effect of the second seal 80 on the gap between the third side wall plate 23 and the second flange edge 33 and the buffering effect of the second seal 80 between the third side wall plate 23 and the second flange edge 33. On the other hand, setting the thickness of the second seal 80 to be less than or equal to 5 mm can alleviate the phenomenon of the second seal 80 occupying too much space between the third side wall plate 23 and the second flange edge 33. This can improve the volumetric energy density of the battery device 100 and optimize the gap size between the third side wall plate 23 and the second flange edge 33, thereby reducing the difficulty of the second seal 80 sealing the gap between the third side wall plate 23 and the second flange edge 33.

[0272] In some embodiments, please continue to see Figure 15 As shown, the thickness of the second seal 80 is greater than or equal to 1.5 mm and less than or equal to 3.5 mm, that is, 1.5 mm ≤ T2 ≤ 3.5 mm.

[0273] In this embodiment, on the one hand, setting the thickness of the second seal 80 to be greater than or equal to 1.5 mm can further improve the relative floating size of the third side wall plate 23 and the second flange edge 33. This can further improve the sealing effect of the second seal 80 on the gap between the third side wall plate 23 and the second flange edge 33, and also further improve the buffering effect of the second seal 80 between the third side wall plate 23 and the second flange edge 33. On the other hand, setting the thickness of the second seal 80 to be less than or equal to 3.5 mm can further alleviate the phenomenon of the second seal 80 occupying too much space between the third side wall plate 23 and the second flange edge 33. This can further improve the volumetric energy density of the battery device 100 and further optimize the gap size between the third side wall plate 23 and the second flange edge 33, thereby further reducing the difficulty of the second seal 80 sealing the gap between the third side wall plate 23 and the second flange edge 33.

[0274] According to some embodiments of this application, see Figure 15 As shown, the second locking member 90 may include a second locking part 91 and a second limiting part 92. Along the axial direction of the second locking part 91, the second locking part 91 passes through the second flange edge 33 and the second sealing member 80 and is locked onto the third side wall plate 23. The second limiting part 92 is connected to one end of the second locking part 91 and abuts against the side of the second flange edge 33 away from the second sealing member 80.

[0275] The second locking part 91 of the second locking member 90 is a structure that passes through the second flange edge 33 and the second sealing member 80 in sequence along the axial direction of the second locking part 91 and is connected to the third side wall plate 23. The second limiting part 92 of the second locking member 90 is a structure that abuts against the side of the second flange edge 33 away from the second sealing member 80 along the axial direction of the second locking part 91, so as to connect the third side wall plate 23 and the second flange edge 33 to each other and clamp the second sealing member 80 through the second locking member 90.

[0276] For example, the axial direction of the second locking part 91 is also the stacking direction of the third side wall plate 23 and the second flange edge 33. In an embodiment where the second flange edge 33 includes a first segment 331, a second segment 332, and an arc segment 333, and the arc segment 333 connects the first segment 331 and the second segment 332, combined with Figure 2 , Figure 4 and Figure 15As shown, the first segment 331 and the third side wall panel 23 are stacked along the first direction X. In the second locking member 90 that locks the first segment 331 and the third side wall panel 23, the axial direction of the second locking part 91 of the second locking member 90 is parallel to the first direction X. The second segment 332 and the third side wall panel 23 are stacked along the second direction Y. In the second locking member 90 that locks the second segment 332 and the third side wall panel 23, the axial direction of the second locking part 91 of the second locking member 90 is parallel to the second direction Y. In the second locking member 90 that locks the arc segment 333 and the third side wall panel 23, since the arc segment 333 is a structure that extends along an arc trajectory, the normal direction of the position where the arc segment 333 is penetrated by the second locking part 91 of the second locking member 90 is parallel to the axial direction of the corresponding second locking part 91 of the second locking member 90.

[0277] In this embodiment, the second locking member 90 is provided with a second locking part 91 that locks onto the third side wall plate 23 and a second limiting part 92 connected to one end of the second locking part 91. By inserting the second locking part 91 into the second sealing member 80 and the second flange edge 33, and by placing the second limiting part 92 against the side of the second flange edge 33 away from the second sealing member 80, the second locking part 91 and the second limiting part 92 locked onto the third side wall plate 23 can cooperate to clamp the second sealing member 80 and the second flange edge 33 between the third side wall plate 23 and the second limiting part 92, so as to realize the assembly connection between the third side wall plate 23 and the second flange edge 33 and the clamping of the second sealing member 80 by the third side wall plate 23 and the second flange edge 33.

[0278] According to some embodiments of this application, please refer to Figure 15 As shown, the second flange edge 33 is provided with a second through hole 334 through which the second locking part 91 passes. The second locking part 91 has a third part 911 that passes through the second through hole 334. The second limiting part 92 is connected to the third part 911. The diameter of the third part 911 is smaller than the diameter of the second through hole 334.

[0279] The second through hole 334 is a structure that passes through the second flange edge 33 along the axial direction of the second locking part 91, that is, the axial direction of the second locking part 91 is also the axial direction of the second through hole 334.

[0280] The third part 911 is the portion of the second locking part 91 that passes through the second through hole 334, and in Figure 15 In the middle, the third part 911 is also inserted inside the second seal 80.

[0281] The diameter of the third part 911 is smaller than the diameter of the second through hole 334. That is to say, the third part 911 of the second locking part 91 located in the second through hole 334 and the hole wall of the second through hole 334 are in a clearance fit structure.

[0282] In this embodiment, by setting the outer diameter of the third part 911 of the second locking part 91 located in the second through hole 334 of the second flange edge 33 to be smaller than the diameter of the second through hole 334, the third part 911 of the second locking part 91 and the second flange edge 33 are in a clearance fit structure, so that the second flange edge 33 has the ability to float relative to the second locking member 90 during use. Since the second locking member 90 is a structure locked to the third side wall plate 23, the second flange edge 33 has the ability to float relative to the third side wall plate 23 during use, thereby alleviating the pulling or twisting caused by the third side wall plate 23 and the second locking member 90 on the second flange edge 33, which is beneficial to further reduce the stress influence on the second box body 30 during use.

[0283] In some embodiments, see Figure 15 As shown, the difference between the diameter of the third part 911 and the diameter of the second through hole 334 is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0284] Among them, Figure 15 In the middle, the diameter of the second through hole 334 is φ3, and the diameter of the third part 911 is φ4. That is, φ3 and φ4 satisfy 0.2mm≤φ3-φ4≤3mm.

[0285] For example, the difference between the diameter of the third part 911 and the diameter of the second through hole 334 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0286] In this embodiment, on the one hand, setting the difference between the outer diameter of the third part 911 of the second locking part 91 and the diameter of the second through hole 334 to be greater than or equal to 0.2 mm can improve the gap between the third part 911 of the second locking part 91 and the hole wall of the second through hole 334, thereby improving the ability of the second flange edge 33 to float relative to the second locking member 90 during use, so as to further alleviate the pulling or twisting of the second flange edge 33 caused by the third side wall plate 23 and the second locking member 90. On the other hand, setting the difference between the outer diameter of the third part 911 of the second locking part 91 and the diameter of the second through hole 334 to be less than or equal to 3 mm can alleviate the phenomenon that the assembly difficulty between the second locking member 90 and the second flange edge 33 is too large due to the excessive gap between the third part 911 of the second locking part 91 and the hole wall of the second through hole 334, and can optimize the difference between the outer diameters of the second limiting part 92 and the second locking part 91 of the second locking member 90, which is beneficial to reducing the molding difficulty of the second locking member 90.

[0287] According to some embodiments of this application, see Figure 15 As shown, along the axial direction of the second locking part 91, the second limiting part 92 has a second abutting surface 921 that abuts against the second flange edge 33, and the orthogonal projection of the hole wall surface of the second through hole 334 in the axial direction of the second locking part 91 is located within the second abutting surface 921.

[0288] The second abutment surface 921 is the surface of the second limiting part 92 facing the second flange edge 33 and abutting against the third side wall plate 23 on the axial side of the second locking part 91. The orthographic projection of the hole wall surface of the second through hole on the axial side of the second locking part 91 is located within the second abutment surface 921. That is, in the projection plane perpendicular to the axial side of the second locking part 91, the orthographic projection of the hole wall surface of the second through hole 334 is located within the orthographic projection of the second abutment surface 921. Correspondingly, in the projection plane perpendicular to the axial side of the second locking part 91, the orthographic projection of the outer peripheral surface of the second limiting part 92 surrounds the outer side of the orthographic projection of the hole wall surface of the second through hole 334.

[0289] In this embodiment, by setting the orthogonal projection of the hole wall surface of the second through hole 334 on the axial direction of the second locking part 91 to be located within the second abutting surface 921, the outer edge of the second limiting part 92 is abutted against the second flange edge 33, thereby improving the stability and reliability of the mutual abutment between the second limiting part 92 and the second flange edge 33, and further improving the stability and reliability of the connection between the second locking member 90 and the third side wall plate 23 and the second flange edge 33.

[0290] According to some embodiments of this application, please continue to refer to Figure 15As shown, the second locking portion 91 may include a third portion 911 and a fourth portion 912. The fourth portion 912 and the second limiting portion 92 are respectively connected to the two ends of the third portion 911 in the axial direction of the second locking portion 91. The diameter of the third portion 911 is larger than the diameter of the fourth portion 912. Along the axial direction of the second locking portion 91, the third portion 911 passes through the second flange edge 33 and the second seal 80, and the third portion 911 abuts against the surface of the third side wall plate 23 facing the second seal 80. The fourth portion 912 is locked onto the third side wall plate 23.

[0291] The fourth part 912 and the second limiting part 92 are respectively connected to the two ends of the third part 911 in the axial direction of the second locking part 91. That is, in the axial direction of the second locking part 91, the third part 911 is the structure between the second locking part 91 and the fourth part 912 and the second limiting part 92, and the third part 911 is the part of the second locking part 91 that passes through the second flange edge 33 and the second sealing member 80. The fourth part 912 is the part of the second locking part 91 that is mutually locked and connected with the third side wall plate 23.

[0292] The diameter of the third part 911 is greater than the diameter of the fourth part 912, that is, the outer diameter of the third part 911 is greater than the outer diameter of the fourth part 912. Correspondingly, in the projection plane perpendicular to the axis of the second locking part 91, the orthographic projection of the fourth part 912 is located within the orthographic projection of the third part 911.

[0293] The third part 911 abuts against the surface of the third side wall plate 23 facing the second seal 80, that is, the third part 911 and the third side wall plate 23 abut against each other along the axial direction of the second locking part 91.

[0294] In this embodiment, by setting the outer diameter of the third part 911, which is inserted into the second sealing member 80 and the second flange edge 33, to be larger than the outer diameter of the fourth part 912, which is locked between the second locking part 91 and the third side wall plate 23, and by setting the third part 911 to abut against the surface of the third side wall plate 23 facing the second sealing member 80 along the axial direction of the second locking part 91, the third part 911 can also limit the fourth part 912 along the axial direction of the second locking part 91 when the fourth part 912 is locked with the third side wall plate 23. Thus, the cooperation between the third part 911 and the fourth part 912 can improve the stability of the second locking part 91 locked on the third side wall plate 23, thereby improving the reliability of the connection between the second locking part 91 and the third side wall plate 23.

[0295] In some embodiments, see Figure 15As shown, the second locking part 91 is screwed to the third side wall plate 23. That is, the second locking part 91 is provided with external threads, the third side wall plate 23 is provided with threaded holes, and the second locking part 91 and the third side wall plate 23 are threadedly engaged. It should be noted that in the embodiment where the second locking part 91 includes a third part 911 and a fourth part 912, the third part 911 is screwed to the third side wall plate 23, that is, the third part 911 is provided with external threads.

[0296] In this embodiment, by setting the second locking part 91 of the second locking member 90 to be screwed onto the third side wall plate 23, the second locking member 90 and the third side wall plate 23 are locked together by a threaded connection. This structure allows for adjustment of the locking force between the third side wall plate 23 and the second flange edge 33 and the clamping force on the second sealing member 80 by adjusting the threaded depth between the second locking part 91 and the third side wall plate 23, so as to meet different usage requirements. This structure also facilitates the assembly and disassembly of the third side wall plate 23 and the second flange edge 33.

[0297] According to some embodiments of this application, in conjunction with Figure 4 and Figure 15 As shown, the second flange edge 33 may include a first segment 331 and two second segments 332. The first segment 331 is connected to the top plate 31, and the two second segments 332 are respectively connected to two second side wall plates 32. The second sealing element 80 may include a first sealing part 81 and two second sealing parts (not shown in the figure). The two sealing parts are respectively connected to the two ends of the first sealing part 81 in the second direction Y. The first sealing part 81 is disposed between the first segment 331 and the third side wall plate 23. Each second sealing part is disposed between a second segment 332 and the third side wall plate 23. The battery device 100 may include a plurality of second locking elements 90. At least one second locking element 90 passes through the first sealing part 81 and locks the first segment 331 and the third side wall plate 23. At least one second locking element 90 passes through the second sealing part and locks the second segment 332 and the third side wall plate 23.

[0298] Specifically, the first segment 331 is the area where the second flange edge 33 connects to the top plate 31, and the second segment 332 is the area where the second flange edge 33 connects to the second side wall plate 32. Similarly, the first sealing portion 81 is the portion of the second sealing member 80 that is sandwiched between the first segment 331 and the third side wall plate 23, while the second sealing portion is the portion of the second sealing member 80 that is sandwiched between the second segment 332 and the third side wall plate 23. In other words, the first sealing portion 81 is the portion of the second sealing member 80 located between the first segment 331 and the third side wall plate 23 in the first direction X, and the second sealing portion is the portion of the second sealing member 80 located between the second segment 332 and the third side wall plate 23 in the second direction Y.

[0299] At least one second locking member 90 passes through the first sealing part 81 and locks the first section 331 and the third side wall plate 23. At least one second locking member 90 passes through the second sealing part and locks the second section 332 and the third side wall plate 23. That is, the first section 331 is provided with a second locking member 90, and the second section 332 is also provided with a second locking member 90.

[0300] In this embodiment, a first sealing portion 81 of a second sealing member 80 is provided between the first segment 331 of the second flange edge 33 and the third side wall plate 23, and a second sealing portion of the second sealing member 80 is provided between the second segment 332 of the second flange edge 33 and the third side wall plate 23. This ensures that the end of the third side wall plate 23 away from the bearing plate 21 in the first direction X and both ends of the third side wall plate 23 in the second direction Y are indirectly in contact with the second flange edge 33 through the second sealing member 80. This allows the second sealing member 80 to better absorb and release the stress generated by the deformation of the first box body 20 during use, thereby reducing the stress on the first box body 20. The stress transmitted from the third side wall panel 23 of the 0 to the second box body 30 is further provided. In addition, at least one second locking member 90 is a structure that passes through the first sealing part 81 and locks the first section 331 and the third side wall panel 23. Furthermore, at least one second locking member 90 is a structure that passes through the second sealing part and locks the second section 332 and the third side wall panel 23. This ensures that the end of the third side wall panel 23 away from the bearing plate 21 in the first direction X and both ends of the third side wall panel 23 in the second direction Y are locked with the second locking member 90 corresponding to the second flange edge 33. This helps to improve the connection stability and reliability between the second flange edge 33 and the third side wall panel 23.

[0301] In some embodiments, please continue to combine Figure 4 and Figure 15 As shown, the second flange edge 33 may further include an arc segment 333, and each second segment 332 is connected to the first segment 331 through an arc segment 333. The second sealing element 80 may further include a transition portion (not shown in the figure), and each second sealing portion is connected to the first sealing portion 81 through a transition portion. The transition portion is disposed between the arc segment 333 and the third side wall plate 23, and at least one second locking element 90 passes through the transition portion and locks the arc segment 333 and the third side wall plate 23.

[0302] Among them, the arc segment 333 is the area in the second flange edge 33 that connects the first segment 331 and the second segment 332, so that the connection position of the first segment 331 and the second segment 332 is a structure with an arc transition. Correspondingly, the transition segment is the part of the second seal 80 that is clamped between the arc segment 333 and the third side wall plate 23.

[0303] At least one second locking member 90 is provided through the transition portion and locks the arc segment 333 and the third side wall plate 23, that is, the arc segment 333 is also provided with a second locking member 90.

[0304] In this embodiment, by connecting the first segment 331 connecting the second flange edge 33 to the top plate 31 and the second segment 332 connecting the second flange edge 33 to the second side wall plate 32 with an arc segment 333, the area where the second flange edge 33 connects to the top plate 31 and the area where the second flange edge 33 connects to the second side wall plate 32 is a structure with an arc transition. This reduces the occurrence of sharp corners at the connection point of the second flange edge 33 with the top plate 31 and the second side wall plate 32. On the one hand, it alleviates the stress concentration phenomenon at the connection point of the second flange edge 33 with the top plate 31 and the second side wall plate 32, thereby reducing the stress concentration of the second flange edge 33 at the connection point. On the one hand, it facilitates the formation of a transition portion connecting the first sealing part 81 and the second sealing part at the position of the arc segment 333 corresponding to the second flange edge 33 of the second sealing element 80. This allows the first sealing part 81 and the second sealing part of the second sealing element 80 to be integrated into a single structure, while also reducing the likelihood of damage to the portion of the second sealing element 80 located between the arc segment 333 of the second flange edge 33 and the third side wall plate 23. Consequently, this improves the sealing effect of the second sealing element 80 between the second flange edge 33 and the third side wall plate 23, while also ensuring the service life of the second sealing element 80.

[0305] According to some embodiments of this application, see Figure 4 and Figure 8 As shown, the first segment 331 and the top plate 31 are connected by a connecting portion 34. The top plate 31 has a first inner surface 316 facing the support plate 21 in the first direction X, and the first segment 331 has a second inner surface 3311 facing the support plate 21 in the first direction X. The second inner surface 3311 abuts against the third side wall plate 23, and the second inner surface 3311 and the first inner surface 316 are connected by the inner surface of the connecting portion 34. Along the first direction X, the first inner surface 316 is further away from the support plate 21 than the second inner surface 3311.

[0306] The connecting part 34 is a component in the second box body 30 that connects the first section 331 and the top plate 31. Correspondingly, the arc section 333 of the second flange edge 33 is also a structure that connects to the top plate 31 and the second side wall plate 32 through the connecting part 34.

[0307] Along the first direction X, the first inner surface 316 is further away from the support plate 21 than the second inner surface 3311. That is to say, the overall structure formed by the top plate 31, the connecting part 34, and the first section 331 of the second flange edge 33 of the second box body 30 is a structure that is recessed from the second inner surface 3311 of the first section 331 in the direction away from the battery cell 10 at the position corresponding to the top plate 31.

[0308] In this embodiment, the first segment 331 of the second flange edge 33 and the top plate 31 are connected to each other through the connecting part 34, and the first inner surface 316 of the top plate 31 is further away from the bearing plate 21 in the first direction X than the second inner surface 3311 of the first segment 331. This ensures that the arc segment 333 and other structures of the second flange edge 33 do not excessively affect the shape of the top plate 31 and the second side wall plate 32. As a result, the side of the second box body 30 facing the battery cell 10 and the position corresponding to the top plate 31 are recessed in the direction away from the battery cell 10 along the first direction X. This allows the second box body 30 to be assembled and connected to the third side wall plate 23 of the first box body 20 through the second flange edge 33, and also increases the volume of the assembly space 40a jointly defined by the first box body 20 and the second box body 30. This reduces the assembly difficulty of the second box body 30 and the third side wall plate 23 of the first box body 20 while increasing the internal space of the battery device 100 for accommodating the battery cell 10.

[0309] According to some embodiments of this application, see Figure 4 As shown, the second sidewall panel 32 has a first flange edge 322 connected to the first sidewall panel 22 at the end away from the top plate 31 in the first direction X. The first flange edge 322 of each second sidewall panel 32 is connected to two second flange edges 33 at both ends in the third direction Z.

[0310] In an embodiment where the first flange edge 322 is connected to the second section 332 of the second flange edge 33, and the second box body 30 includes two second side wall panels 32, and each second side wall panel 32 is formed with a first flange edge 322, then it is a structure in which one first flange edge 322, one second flange edge 33, another first flange edge 322 and another second flange edge 33 are connected end to end in sequence.

[0311] In this embodiment, by connecting the two ends of the first flange edge 322 of the second side wall panel 32 in the third direction Z to the two second flange edges 33 located at the two ends of the top plate 31 in the third direction Z, the first flange edge 322 and the second flange edge 33 of the second box body 30 used for assembly and connection with the first box body 20 are formed into an integral structure. This not only improves the overall structural strength of the second box body 30, but also effectively improves the assembly reliability between the second box body 30 and the first box body 20.

[0312] According to some embodiments of this application, see Figure 7 As shown, the first side wall panel 22 and the supporting plate 21 are separately arranged but connected.

[0313] For example, the connection structure between the first side wall panel 22 and the bearing plate 21 can be various, such as welding connection, bolt connection, snap connection or adhesive connection.

[0314] In this embodiment, by setting the first side wall panel 22 and the support plate 21 as separate structures, on the one hand, the difficulty of setting the first side wall panel 22 on both sides of the support plate 21 along the second direction Y can be reduced, thereby reducing the manufacturing difficulty of the first box body 20. On the other hand, the position of the first side wall panel 22 in the first direction X can be adjusted according to the actual situation, so as to adjust the size of the support surface 211 of the first side wall panel 22 protruding from the support plate 21 in the first direction X, which is beneficial to improving the applicability of the first box body 20.

[0315] According to some embodiments of this application, see Figure 5 As shown, the third side wall panel 23 is detachably connected to the support plate 21.

[0316] For example, the third side wall panel 23 and the supporting plate 21 are connected by bolts.

[0317] In this embodiment, by setting the third side wall panel 23 to be detachably connected to the support plate 21, different third side wall panels 23 can be replaced according to different usage requirements, and it is convenient to maintain and repair the first box body 20 in the future, which helps to reduce the later use cost of the battery device 100.

[0318] According to some embodiments of this application, see Figure 3 and Figure 5 As shown, the first box body 20 may also include a reinforcing member 24. The reinforcing member 24 is disposed on the side of the support plate 21 facing the top plate 31, the reinforcing member 24 extends along the second direction Y, and the two ends of the reinforcing member 24 in the second direction Y are respectively connected to the two first side wall plates 22.

[0319] Among them, the reinforcing member 24 is a strip structure extending along the second direction Y, and the two ends of the reinforcing member 24 in the second direction Y are respectively connected to the two first side wall panels 22 of the first box body 20.

[0320] For example, the reinforcement 24 is bolted to the side of the support plate 21 facing the top plate 31. Of course, in other embodiments, the reinforcement 24 may also be welded or bonded to the support plate 21.

[0321] In this embodiment, by providing a reinforcing member 24 on the side of the support plate 21 facing the top plate 31, and extending along the second direction Y and connecting with both first side wall plates 22, the two first side wall plates 22 located on both sides of the support plate 21 in the second direction Y can be further reinforced and strengthened by the reinforcing member 24, which is beneficial to improving the overall structural strength of the first box body 20.

[0322] In some embodiments, please continue to see Figure 3 and Figure 5 As shown, the first housing body 20 may include two reinforcing members 24, which are arranged at intervals along the third direction Z. Along the third direction Z, the battery cell 10 is disposed between the two reinforcing members 24.

[0323] The battery device 100 includes a plurality of battery cells 10, and the overall structure formed by the plurality of battery cells 10 is such that the two sides of the battery cells 10 respectively abut against two reinforcing members 24 in the third direction Z.

[0324] In this embodiment, by providing two reinforcing members 24 on the support plate 21, and the two reinforcing members 24 being arranged at intervals along the third direction Z on both sides of all battery cells 10, the battery device 100 with this structure can, on the one hand, connect the two reinforcing members 24 and the two first side wall plates 22 to form an integral frame structure, which is beneficial to further improve the overall structural strength of the first box body 20. On the other hand, the two reinforcing members 24 can also play a certain limiting role for the battery cells 10 placed on the support plate 21 in the third direction Z, so as to reduce the risk of the battery cells 10 shaking or shifting along the third direction Z during use.

[0325] Of course, the structure of the battery device 100 is not limited to this. According to some embodiments of this application, the battery device 100 can also have other structures, see reference. Figure 16 , Figure 17 , Figure 18 and Figure 19 As shown, Figure 16 This is a schematic diagram of the structure of the battery device 100 provided in some further embodiments of this application. Figure 17This is an exploded view of the structure of the battery device 100 provided in some further embodiments of this application. Figure 18 This is a schematic diagram of the structure of the second housing body 30 of the battery device 100 provided in some further embodiments of this application. Figure 19 This is a schematic diagram of the structure of the first housing body 20 of the battery device 100 provided in some further embodiments of this application. The first housing body 20 includes a plurality of first side wall panels 22, which surround the support plate 21 and are connected end to end in sequence. The second housing body 30 includes a plurality of second side wall panels 32, which surround the top plate 31 and are connected end to end in sequence, with each second side wall panel 32 connected to a first side wall panel 22.

[0326] The first box body 20 includes a plurality of first side wall panels 22 connected end to end, and the plurality of first side wall panels 22 surround the support plate 21, making the first box body 20 a hollow structure with an opening on the side facing the second box body 30 in the first direction X. Similarly, the second box body 30 includes a plurality of second side wall panels 32 connected end to end, and the plurality of second side wall panels 32 surround the top plate 31, making the second box body 30 a hollow structure with an opening on the side facing the first box body 20 in the first direction X. Correspondingly, each second side wall panel 32 is connected to a first side wall panel 22, so that the first box body 20 and the second box body 30 are mutually covering structures.

[0327] In this embodiment, the first box body 20 is provided with a plurality of first side wall panels 22 surrounding the support plate 21. Correspondingly, the second box body 30 is provided with a plurality of second side wall panels 32 surrounding the top plate 31. Each second side wall panel 32 is connected to a first side wall panel 22, so that both the first box body 20 and the second box body 30 are open on one side and cover each other. This enables the assembly connection between the first box body 20 and the second box body 30 and jointly defines the assembly space 40a for accommodating the battery cell 10. The structure is simple and easy to implement.

[0328] According to some embodiments of this application, refer to Figure 17 , Figure 18 and Figure 19 Please refer to further details. Figure 20 and Figure 21 , Figure 20 A cross-sectional view of the second housing body 30 of the battery device 100 provided in some further embodiments of this application, perpendicular to the third direction Z. Figure 21The first housing body 20 of the battery device 100 provided in some embodiments of this application is a cross-sectional view perpendicular to the third direction Z. The second side wall panel 32 has a first flange edge 322 connected to the first side wall panel 22 at the end away from the top plate 31 in the first direction X. The thickness direction of the first flange edge 322 is parallel to the first direction X, and the first flange edge 322 and the first side wall panel 22 are stacked along the first direction X. A first sealing member 50 is disposed between the first flange edge 322 and the first side wall panel 22. A first locking member 60 passes through the first sealing member 50 and locks the first flange edge 322 and the first side wall panel 22.

[0329] The second side wall panel 32 includes a body portion 321 and a first flange edge 322 connected to each other. The two ends of the body portion 321 in the first direction X are respectively connected to the top plate 31 and the first flange edge 322. The thickness direction of the first flange edge 322 is parallel to the first direction X. The body portion 321 and the first flange edge 322 form an "L" shape. Correspondingly, the thickness direction of the first flange edge 322 and the thickness direction of the body portion 321 can be set at an acute angle, a right angle or an obtuse angle. The first sealing member 50 is a structure disposed between the first flange edge 322 and the first side wall panel 22 in the first direction X. Correspondingly, the first locking member 60 passes through the first flange edge 322 and the first sealing member 50 in sequence along the first direction X and is locked onto the first side wall panel 22. The axial direction of the first locking part 61 of the first locking member 60 is parallel to the first direction X.

[0330] In this embodiment, by setting the first flange edge 322 of the second side wall plate 32, which is used to connect with the first side wall plate 22, to be stacked with the first side wall plate 22 along the first direction X, the stacking direction of the first flange edge 322 and the first side wall plate 22 is consistent with the thickness direction of the first flange edge 322 and the same as the closing direction of the first box body 20 and the second box body 30. This reduces the difficulty of the first locking member 60 locking the first side wall plate 22 and the first flange edge 322, and also reduces the difficulty of clamping the first sealing member 50 between the first side wall plate 22 and the second side wall plate 32, thereby reducing the assembly difficulty of the battery device 100.

[0331] In some embodiments, see Figure 18 As shown, the first flange edges 322 of multiple second sidewall plates 32 are connected end to end in sequence.

[0332] In this embodiment, by setting the first flange edges 322 of the multiple second side wall panels 32 to be connected end to end, the first flange edges 322 of the multiple second side wall panels 32 form an integral structure and a ring structure extending circumferentially along the top plate 31. This not only improves the overall structural strength of the second box body 30, but also effectively improves the assembly reliability between the second box body 30 and the first box body 20.

[0333] According to some embodiments of this application, refer to Figure 19 and Figure 21 Please refer to further details. Figure 22 As shown, Figure 22 for Figure 21 The diagram shows a partial enlarged view of point D on the first box body 20. The first sidewall panel 22 includes a panel body 222 and a flange 223. The panel body 222 is connected to the support plate 21 and protrudes from the support surface 211. The flange 223 is connected to the end of the panel body 222 away from the support plate 21, and the thickness direction of the flange 223 is parallel to the first direction X. The flange 223 and the first flange edge 322 are stacked along the first direction X. The first sealing member 50 is disposed between the first flange edge 322 and the flange 223. The first locking member 60 passes through the first sealing member 50 and locks the first flange edge 322 and the flange 223.

[0334] The first sidewall panel 22 is bent to form a panel body 222 and a flange 223. The panel body 222 is connected between the flange 223 and the bearing plate 21. The thickness direction of the flange 223 is parallel to the first direction X, so that the thickness direction of the flange 223 is consistent with the thickness direction of the first flange edge 322. This allows the flange 223 and the first flange edge 322 to be stacked and connected along the first direction X. Correspondingly, the first locking member 60 is a structure that passes through the first flange edge 322 and the first sealing member 50 in sequence along the first direction X and is then locked onto the flange 223. In the embodiment where the first locking member 60 is a bolt, the flange 223 is provided with a threaded hole that is threadedly engaged with the first locking member 60.

[0335] For example, the body 222 and the flange 223 of the first sidewall panel 22 are integrally formed.

[0336] In this embodiment, the first sidewall panel 22 includes a plate body 222 and a flange portion 223 connected to each other. The plate body 222 is connected to the support plate 21 and protrudes from the support surface 211. The thickness direction of the flange portion 223 is parallel to the first direction X, so that the cross-section of the first sidewall panel 22 is a bent "L" shaped structure. By setting the flange portion 223 of the first sidewall panel 22 in a structure that is stacked and connected to the first flange edge 322 along the first direction X, the assembly difficulty between the first box body 20 and the second box body 30 can be reduced, and the contact area between the first box body 20 and the second box body 30 can be increased to improve the connection stability between the first box body 20 and the second box body 30.

[0337] In some embodiments, see Figure 21 and Figure 22 As shown, the first side wall panel 22 and the bearing plate 21 are integrally formed.

[0338] For example, the first box body 20 is made of metal. Correspondingly, the first side wall panel 22 and the bearing plate 21 of the first box body 20 can be manufactured by an integral molding process such as extrusion molding or stamping molding.

[0339] In this embodiment, by setting the first side wall panel 22 as an integrally formed structure with the support plate 21, on the one hand, the connection stability and reliability between the first side wall panel 22 and the support plate 21 can be improved, which helps to reduce the risk of the first side wall panel 22 and the support plate 21 separating during use, thereby improving the reliability of the first box body 20. On the other hand, it can reduce the difficulty of setting multiple first side wall panels 22 around the support plate 21, thereby reducing the molding difficulty of the first box body 20.

[0340] According to some embodiments of this application, see Figure 7 as well as Figure 22 As shown, a flow channel 212 is formed inside the support plate 21, which is used to contain the heat exchange medium. The support plate 21 is also configured to manage the temperature of the battery cell 10.

[0341] The heat exchange medium contained in the flow channel 212 of the support plate 21 can exchange heat with the battery cell 10, so that the support plate 21 can manage the temperature of the battery cell 10. It should be noted that the heat exchange medium contained in the flow channel 212 of the support plate 21 can be a variety of substances. For example, the heat exchange medium can be a gas, such as air or hydrogen, or a liquid, such as water, salt water solution or liquid nitrogen.

[0342] In this embodiment, by providing a flow channel 212 inside the support plate 21 for accommodating the heat exchange medium, the support plate 21 also has the function of heat exchange with the battery cell 10. Thus, the support plate 21 can not only support the battery cell 10, but also manage the temperature of the battery cell 10 during use. The components for managing the temperature of the battery cell 10 are integrated onto the support plate 21, thereby improving the internal space utilization of the battery device 100 while managing the temperature of the battery cell 10. This is beneficial for improving the reliability of the battery device 100 while taking into account the volumetric energy density of the battery device 100.

[0343] In some embodiments, see Figure 7 As shown, the battery device 100 may also include a heat-conducting element 101, which is disposed between the bearing surface 211 and the battery cell 10 along the first direction X.

[0344] For example, the material of the heat-conducting component 101 can be various, such as silicone, silicone grease or silicone rubber.

[0345] In this embodiment, by providing a heat-conducting component 101 between the battery cell 10 and the bearing surface 211 of the bearing plate 21, the heat-conducting component 101 can improve the heat transfer efficiency between the battery cell 10 and the bearing plate 21, thereby improving the effect of the bearing plate 21 in managing the temperature of the battery cell 10.

[0346] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0347] The electrical device can be any of the aforementioned devices or systems that utilize battery device 100.

[0348] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0349] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Battery cell; The first box body is provided with a mounting structure. The first box body includes a support plate and a first side wall plate. The support plate has a support surface on one side in a first direction. The support surface is used to support the battery cell along the first direction. The first side wall plate is connected to the support plate and protrudes from the support surface. as well as The second box body, together with the first box body, defines an assembly space for accommodating the battery cell. The second box body includes a top plate and a second side wall plate. The top plate and the support plate are arranged opposite to each other along the first direction. One end of the second side wall plate is connected to the top plate in the first direction. Along the first direction, the size of the first side wall plate protruding from the support surface is less than one-quarter of the maximum size of the second side wall plate. The first sidewall panel and the second sidewall panel do not contact each other, and a first sealing member is sandwiched between the first sidewall panel and the second sidewall panel. The battery device also includes a first locking member, which passes through the first sealing member and locks the first sidewall panel and the second sidewall panel.

2. The battery device according to claim 1, characterized in that, The thickness of the first seal is greater than or equal to 0.5 mm and less than or equal to 5 mm.

3. The battery device according to claim 2, characterized in that, The thickness of the first seal is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

4. The battery device according to claim 1, characterized in that, The first locking member includes a first locking part and a first limiting part. Along the axial direction of the first locking part, the first locking part passes through the second side wall plate and the first seal and is locked onto the first side wall plate. The first limiting part is connected to one end of the first locking part and abuts against the side of the second side wall plate away from the first seal.

5. The battery device according to claim 4, characterized in that, The second sidewall panel is provided with a first through hole through which the first locking part passes. The first locking part has a first portion that passes through the first through hole, and the first limiting part is connected to the first portion. The diameter of the first part is smaller than the diameter of the first through hole.

6. The battery device according to claim 5, characterized in that, The difference between the diameter of the first part and the diameter of the first through hole is greater than or equal to 0.2 mm and less than or equal to 3 mm.

7. The battery device according to claim 5, characterized in that, Along the axial direction of the first locking portion, the first limiting portion has a first abutting surface that abuts against the second side wall plate; Wherein, the orthogonal projection of the hole wall surface of the first through hole onto the axial direction of the first locking part is located within the first abutting surface.

8. The battery device according to claim 4, characterized in that, The first locking part includes a first part and a second part, the second part and the first limiting part are respectively connected to the two ends of the first part in the axial direction of the first locking part, and the diameter of the first part is larger than the diameter of the second part; Along the axial direction of the first locking part, the first part passes through the second side wall plate and the first seal, and the first part abuts against the surface of the first side wall plate facing the first seal, while the second part is locked onto the first side wall plate.

9. The battery device according to claim 4, characterized in that, The first locking part is screwed to the first side wall plate.

10. The battery device according to claim 1, characterized in that, The second sidewall panel includes a body portion and a first flange edge. Along the first direction, one end of the body portion is connected to the top plate, and the first flange edge is connected to the end of the body portion away from the top plate. The first flange edge and the first sidewall panel are stacked, and the first sealing member is disposed between the first flange edge and the first sidewall panel. The first locking member passes through the first sealing member and locks the first sidewall panel and the first flange edge. The wall thickness of the first flange edge is greater than the wall thickness of the body portion.

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

12. The battery device according to claim 11, characterized in that, The buffer is supported between the second sidewall panel and the battery cell, and the second sidewall panel bulges in a direction away from the battery cell.

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

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

15. The battery device according to claim 14, characterized in that, The reinforcing part is integrally formed with the top plate, and along the first direction, the reinforcing part protrudes from the surface of one side of the top plate.

16. The battery device according to claim 14, characterized in that, The reinforcing part is separately disposed from the top plate, the reinforcing part is embedded in the top plate, and the rigidity of the reinforcing part is greater than that of the top plate.

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

18. The battery device according to any one of claims 1-17, characterized in that, The first box body includes two first side wall panels arranged opposite each other along the second direction, and the second box body includes two second side wall panels arranged opposite each other along the second direction, with each second side wall panel connected to one of the first side wall panels; The first box body further includes two third side wall panels arranged opposite each other along a third direction. Both third side wall panels are connected to the side of the support plate facing the top plate. The two third side wall panels are located at both ends of the second box body in the third direction, and the top plate and the two second side wall panels are connected to the third side wall panels. The first direction, the second direction and the third direction are perpendicular to each other.

19. The battery device according to claim 18, characterized in that, The second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction. The thickness direction of the first flange edge is parallel to the second direction, and the first flange edge and the first sidewall panel are stacked along the second direction. The first sealing member is disposed between the first flange edge and the first sidewall panel, and the first locking member passes through the first sealing member and locks the first flange edge and the first sidewall panel.

20. The battery device according to claim 19, characterized in that, Along the second direction, the first sidewall plate is located on the side of the first flange facing the assembly space.

21. The battery device according to claim 18, characterized in that, The second box body is provided with second flange edges at both ends in the third direction, and the second flange edges connect the top plate and the two second side wall plates; Wherein, both ends of the third sidewall in the second direction and the end of the third sidewall away from the bearing plate in the first direction are connected to the second flange edge.

22. The battery device according to claim 21, characterized in that, The third sidewall panel and the second flange edge do not contact each other, and a second sealing element is sandwiched between the third sidewall panel and the second flange edge; The battery device further includes a second locking member, which passes through the second seal and locks the third side wall plate and the second flange edge to connect the third side wall plate and the second flange edge.

23. The battery device according to claim 22, characterized in that, The thickness of the second seal is greater than or equal to 0.5 mm and less than or equal to 5 mm.

24. The battery device according to claim 23, characterized in that, The thickness of the second seal is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

25. The battery device according to claim 22, characterized in that, The second locking member includes a second locking part and a second limiting part. Along the axial direction of the second locking part, the second locking part passes through the second flange edge and the second seal and is locked onto the third side wall plate. The second limiting part is connected to one end of the second locking part and abuts against the side of the second flange edge away from the second seal.

26. The battery device according to claim 25, characterized in that, The second flange edge is provided with a second through hole for the second locking part to pass through, the second locking part has a third part that passes through the second through hole, and the second limiting part is connected to the third part; The diameter of the third part is smaller than the diameter of the second through hole.

27. The battery device according to claim 26, characterized in that, The difference between the diameter of the third part and the diameter of the second through hole is greater than or equal to 0.2 mm and less than or equal to 3 mm.

28. The battery device according to claim 26, characterized in that, Along the axial direction of the second locking portion, the second limiting portion has a second abutting surface that abuts against the edge of the second flange; The orthogonal projection of the wall surface of the second through hole onto the axial direction of the second locking part is located within the second abutment surface.

29. The battery device according to claim 25, characterized in that, The second locking part includes a third part and a fourth part. The fourth part and the second limiting part are respectively connected to the two ends of the third part in the axial direction of the second locking part. The diameter of the third part is larger than the diameter of the fourth part. Along the axial direction of the second locking part, the third part passes through the second flange edge and the second seal, and the third part abuts against the surface of the third side wall plate facing the second seal, and the fourth part is locked onto the third side wall plate.

30. The battery device according to claim 25, characterized in that, The second locking part is screwed to the third side wall plate.

31. The battery device according to claim 22, characterized in that, The second flange edge includes a first section and two second sections, the first section being connected to the top plate, and the two second sections being connected to the two second side wall plates respectively; The second sealing element includes a first sealing portion and two second sealing portions. The two sealing portions are respectively connected to the two ends of the first sealing portion in the second direction. The first sealing portion is disposed between the first segment and the third side wall plate. Each second sealing portion is disposed between a second segment and the third side wall plate. The battery device includes a plurality of second locking members. At least one second locking member passes through the first sealing portion and locks the first segment and the third side wall plate. At least one second locking member passes through the second sealing portion and locks the second segment and the third side wall plate.

32. The battery device according to claim 31, characterized in that, The second flange edge also includes an arc segment, and each second segment is connected to the first segment via one of the arc segments; The second sealing member further includes a transition portion, each of the second sealing portions being connected to the first sealing portion through a transition portion. The transition portion is disposed between the arc segment and the third side wall plate, and at least one second locking member passes through the transition portion and locks the arc segment and the third side wall plate.

33. The battery device according to claim 31, characterized in that, The first segment and the top plate are connected by a connecting part; The top plate has a first inner surface facing the support plate in the first direction, and the first segment has a second inner surface facing the support plate in the first direction. The second inner surface abuts against the third side wall plate, and the second inner surface and the first inner surface are connected through the inner surface of the connecting portion. Along the first direction, the first inner surface is further away from the support plate than the second inner surface.

34. The battery device according to claim 21, characterized in that, The second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction, and the first flange edge of each second sidewall panel is connected to two second flange edges at both ends in the third direction.

35. The battery device according to claim 18, characterized in that, The first side wall panel and the supporting plate are separately arranged but connected.

36. The battery device according to claim 18, characterized in that, The third side wall panel is detachably connected to the supporting plate.

37. The battery device according to claim 18, characterized in that, The first box body also includes: A reinforcing member is disposed on the side of the supporting plate facing the top plate. The reinforcing member extends along the second direction, and its two ends in the second direction are respectively connected to the two first side wall plates.

38. The battery device according to claim 37, characterized in that, The first housing body includes two reinforcing members, which are arranged at intervals along the third direction, and the battery cell is disposed between the two reinforcing members along the third direction.

39. The battery device according to any one of claims 1-17, characterized in that, The first box body includes a plurality of first side wall panels, which surround the bearing plate and are connected end to end in sequence. The second box body includes a plurality of second side wall panels, which surround the top plate and are connected end to end in sequence, with each second side wall panel connected to a first side wall panel.

40. The battery device according to claim 39, characterized in that, The second sidewall panel has a first flange edge connected to the first sidewall panel at the end away from the top plate in the first direction. The thickness direction of the first flange edge is parallel to the first direction, and the first flange edge and the first sidewall panel are stacked along the first direction. The first sealing member is disposed between the first flange edge and the first sidewall panel, and the first locking member passes through the first sealing member and locks the first flange edge and the first sidewall panel.

41. The battery device according to claim 40, characterized in that, The first flange edges of multiple second sidewall panels are connected end to end in sequence.

42. The battery device according to claim 40, characterized in that, The first sidewall panel includes a panel body and a flange portion. The panel body is connected to the support plate and protrudes from the support surface. The flange portion is connected to the end of the panel body away from the support plate, and the thickness direction of the flange portion is parallel to the first direction. The flange portion and the first flange edge are stacked together along the first direction, the first sealing member is disposed between the first flange edge and the flange portion, and the first locking member passes through the first sealing member and locks the first flange edge and the flange portion.

43. The battery device according to claim 39, characterized in that, The first side wall panel and the bearing plate are integrally formed.

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

45. The battery device according to claim 44, characterized in that, The battery device further includes a heat-conducting element, which is disposed between the bearing surface and the battery cell along the first direction.

46. ​​An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-45, the battery device being used to provide electrical energy.

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