Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body, a bracket, a first locking piece, a second locking piece, a first battery monomer assembly and a second battery monomer assembly; a first expansion beam and a second expansion beam are arranged at an interval along a first direction; the support divides the inner space of the box body into a first containing space and a second containing space which are located on the two sides of the support, and the first containing space and the second containing space are arranged in the second direction. The first locking piece is arranged in the second direction, and the support is connected to the first expansion beam through the first locking piece. The second locking piece is arranged in the second direction, and the support is connected to the second expansion beam through the second locking piece. The first battery monomer assembly is arranged in the first accommodating space, and the first battery monomer assembly is arranged between the first expansion beam and the second expansion beam; the second battery cell assembly is disposed in the second accommodation space. According to the technical scheme, the energy density of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and more particularly, to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] During the manufacturing process of battery devices, the energy density of battery devices is an issue that cannot be ignored. Therefore, how to improve the energy density of battery devices is an urgent technical problem in battery device technology. Summary of the Utility Model

[0004] The present application provides a battery device and an electrical device, which can improve the energy density of the battery device.

[0005] The present application is achieved by the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery device, which includes a box body, a bracket, a first locking member, a second locking member, a first battery cell assembly, and a second battery cell assembly. The box body includes a bottom wall, a first expansion beam, and a second expansion beam. The first expansion beam and the second expansion beam are spaced apart along a first direction, and the first expansion beam and the second expansion beam are respectively connected to the bottom wall. The bracket is disposed inside the box body and divides the internal space of the box body into a first accommodation space and a second accommodation space located on both sides of the bracket. The first accommodation space and the second accommodation space are arranged along a second direction, and the second direction intersects the first direction. The first locking member is disposed along the second direction, and the bracket is connected to the first expansion beam through the first locking member. The second locking member is disposed along the second direction, and the bracket is connected to the second expansion beam through the second locking member. The first battery cell assembly includes a plurality of first battery cells stacked along the first direction. The first battery cell assembly is disposed in the first accommodation space, and the first battery cell assembly is disposed between the first expansion beam and the second expansion beam, and the bottom wall supports the first battery cell assembly. The second battery cell assembly includes a plurality of second battery cells stacked along the first direction. The second battery cell assembly is disposed in the second accommodation space, and the bracket supports the second battery cell assembly. The bracket includes a support wall, a third expansion beam, and a fourth expansion beam. The support wall is located between the first battery cell assembly and the second battery cell assembly. The third expansion beam and the fourth expansion beam are relatively disposed along the first direction and are respectively connected to the support wall. The support wall supports the second battery cell assembly, and the second battery cell assembly is disposed between the third expansion beam and the fourth expansion beam. The fourth expansion beam has a first end face facing away from the bottom wall and a second end face facing the bottom wall. Along the second direction, the second locking member penetrates through the first end face and the second end face and is connected to the second expansion beam, and the size of the second locking member is larger than the size of the fourth expansion beam.

[0007] According to the battery device of the embodiment of the present application, the internal space of the box body is divided into a first accommodation space and a second accommodation space by a bracket. The first accommodation space and the second accommodation space are arranged along the second direction. The first battery cell assembly is accommodated in the first accommodation space, and the second battery cell assembly is accommodated in the second accommodation space, which can improve the space utilization rate of the interior of the box body in the second direction, so that more battery cells can be arranged in the battery device in the second direction, and the battery device has a higher energy density. The first expansion beam and the second expansion beam are arranged on both sides of the first battery cell assembly along the first direction to facilitate restraining the expansion and deformation of the first battery cell assembly through the first expansion beam and the second expansion beam. The bracket is connected to the first expansion beam through a first locking member, and the bracket is connected to the second expansion beam through a second locking member. By using the first expansion beam and the second expansion beam to support the bracket, the space occupied by the connection and fixing position of the bracket in the first accommodation space between the first expansion beam and the second expansion beam can be reduced. For example, there is no need to provide a structure for connecting with the bracket in the direction perpendicular to both the first direction and the second direction of the box body, so that more active materials can be arranged in the first accommodation space between the first expansion beam and the second expansion beam, and the battery device has a higher energy density. Moreover, both the first locking member and the second locking member are arranged along the second direction, further reducing the space occupied by the connection and fixing position of the bracket in the first accommodation space between the first expansion beam and the second expansion beam, so that the battery device has a higher energy density. The support wall supports the second battery cell assembly, provides positioning support for the second battery cell assembly, and reduces the risk of the second battery cell assembly moving inside the box body. The third expansion beam and the fourth expansion beam are arranged opposite to each other along the first direction and are respectively connected to the support wall. The second battery cell assembly is arranged between the third expansion beam and the fourth expansion beam to facilitate restraining the expansion and deformation of the second battery cell assembly through the third expansion beam and the fourth expansion beam, thereby improving the reliability of the battery device. The dimension of the second locking member along the second direction is larger than the dimension of the fourth expansion beam. The second locking member penetrates through the fourth expansion beam in the second direction and then is connected to the second expansion beam, which can utilize the space inside the fourth expansion beam, reduce the space occupied by the second locking member on both sides of the fourth expansion beam along the first direction, and further improve the space utilization rate inside the battery device and the energy density of the battery device. At the same time, the second locking member and the fourth expansion beam have a large connection area, making the connection between the second locking member and the fourth expansion beam reliable and improving the connection reliability between the fourth expansion beam and the second expansion beam.

[0008] According to some embodiments of the present application, the first expansion beam is provided with a first mounting hole, and the second expansion beam is provided with a second mounting hole; the third expansion beam is provided with a third mounting hole corresponding to the first mounting hole, the first locking member passes through the third mounting hole and is connected to the first mounting hole, the fourth expansion beam is provided with a fourth mounting hole corresponding to the second mounting hole, along the second direction, the fourth mounting hole penetrates through the first end face and the second end face, and the second locking member passes through the fourth mounting hole and is connected to the second mounting hole.

[0009] In the above solution, the first locking member passes through the third mounting hole and is connected to the first mounting hole, which is convenient for assembly and disassembly, and makes the connection between the third expansion beam and the first expansion beam have high reliability; the fourth mounting hole penetrates through the first end face and the second end face along the second direction, which can utilize the space inside the fourth expansion beam, reduce the space occupied by the fourth mounting hole on both sides of the fourth expansion beam along the first direction, the second locking member passes through the fourth mounting hole and is connected to the second mounting hole, which is convenient for assembly and disassembly, and makes the connection between the fourth expansion beam and the second expansion beam have high reliability.

[0010] According to some embodiments of the present application, the first expansion beam includes a first body and a first convex portion, the first convex portion is formed on a side of the first body facing away from the first battery cell assembly, and the first mounting hole is provided in the first convex portion; the third expansion beam includes a second body and a second convex portion, the second convex portion is formed on a side of the second body facing away from the second battery cell assembly, and the third mounting hole penetrates through the second convex portion along the second direction.

[0011] In the above solution, the first convex portion is formed on a side of the first body facing away from the first battery cell assembly, and the first mounting hole is provided in the first convex portion, which can reduce the occupation of the connection position between the bracket and the first expansion beam on the side of the first expansion beam facing the first battery cell assembly, improve the space utilization rate between the first expansion beam and the second expansion beam, and make the battery device have a high energy density; the second convex portion is formed on a side of the second body facing away from the second battery cell assembly, and the third mounting hole penetrates through the second convex portion along the second direction, so that the third mounting hole and the first mounting hole are arranged corresponding to each other along the second direction, and the first fastening member can pass through the third mounting hole along the second direction and be connected to the first mounting hole, which is convenient for operation, can reduce the risk of interference between the first fastening member connecting the bracket and the first expansion beam and the second battery cell assembly and the first battery cell assembly, and more active substances can be arranged in the first accommodation space between the first expansion beam and the second expansion beam, and more active substances can be arranged in the second accommodation space between the third expansion beam and the fourth expansion beam, so that the battery device has a high energy density.

[0012] According to some embodiments of the present application, the number of the first convex portions is multiple, the multiple first convex portions are arranged at intervals in the third direction, and at least one first mounting hole is provided on each first convex portion; and / or, the number of the second convex portions is multiple, the multiple second convex portions are arranged at intervals in the third direction, and at least one third mounting hole is provided on each second convex portion; the third direction, the second direction, and the first direction are perpendicular to each other in pairs.

[0013] In the above solution, by arranging the multiple first convex portions at intervals in the third direction and providing at least one first mounting hole on each first convex portion, other components inside the box body (such as connecting cables, output poles, binding members, etc.) can be avoided in the third direction while meeting the connection reliability between the bracket and the first expansion beam; by arranging the multiple second convex portions at intervals in the third direction and providing at least one third mounting hole on each second convex portion, other components inside the box body (such as connecting cables, output poles, binding members, etc.) can be avoided in the third direction while meeting the connection reliability between the bracket and the first expansion beam.

[0014] According to some embodiments of the present application, a plurality of cavities arranged in the second direction are formed inside the fourth expansion beam, adjacent two cavities are separated by a partition wall, and the fourth mounting hole penetrates through the partition wall.

[0015] In the above solution, the multiple cavities are arranged in the second direction, and adjacent two cavities are separated by a partition wall, so that the fourth expansion beam can absorb the expansion of the second battery monomer assembly in the first direction, improving the reliability of the second battery monomer assembly; the fourth mounting hole penetrates through the partition wall to facilitate the positioning of the second locking member and improve the connection reliability between the second locking member and the fourth expansion beam.

[0016] According to some embodiments of the present application, the box body further includes a first side wall and a second side wall oppositely arranged in the first direction, the first side wall and the second side wall are respectively connected to the bottom wall, the first expansion beam and the second expansion beam are arranged between the first side wall and the second side wall, and the first expansion beam is closer to the first side wall than the second expansion beam; in the first direction, the distance between the first expansion beam and the first side wall is greater than the distance between the second expansion beam and the second side wall.

[0017] In the above scheme, the first side wall and the second side wall are respectively connected to the bottom wall, and the first side wall and the second side wall constitute the side beam of the box body, so that the two ends in the first direction constitute a protective structure for the components inside the box body; the distance between the first expansion beam and the first side wall is greater than the distance between the second expansion beam and the second side wall, and there is a larger space between the first expansion beam and the first side wall. By arranging the first protrusion on the side of the first body away from the first battery cell assembly, the space between the first expansion beam and the first side plate can be utilized, reducing the occupation of the first locking member in the first accommodation space between the first expansion beam and the second expansion beam, so that more active materials can be arranged in the first accommodation space between the first expansion beam and the second expansion beam, which is convenient for improving the energy density of the battery device.

[0018] According to some embodiments of the present application, the battery device also includes a first restraining member, the two ends of which are respectively connected to the first expansion beam and the second expansion beam, and the first restraining member is connected to the side of the first battery cell facing away from the bottom wall; the battery device also includes a second restraining member, the two ends of which are respectively connected to the third expansion beam and the fourth expansion beam, and the second restraining member is connected to the side of the second battery cell facing away from the support wall.

[0019] In the above scheme, the two ends of the first restraint are respectively connected to the first expansion beam and the second expansion beam, which can improve the restraining effect of the first expansion beam and the second expansion beam on the expansion and deformation of the first battery cell assembly, and the first restraint is connected to the side of the first battery cell away from the bottom wall, which can limit the movement of the first battery cell toward the side away from the bottom wall, so as to improve the reliability of the first battery cell assembly; the two ends of the second restraint are respectively connected to the third expansion beam and the fourth expansion beam, which can improve the restraining effect of the third expansion beam and the fourth expansion beam on the expansion and deformation of the second battery cell assembly, and the second restraint is connected to the side of the second battery cell away from the support wall, which can limit the movement of the second battery cell toward the side away from the support wall, so as to improve the reliability of the second battery cell assembly.

[0020] According to some embodiments of the present application, the box body includes a first box body and a second box body, which are connected to each other and enclose an internal space; the first box body includes a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall are arranged opposite to each other along a first direction, the first side wall and the second side wall are respectively connected to the bottom wall, and the first battery cell assembly and the second battery cell assembly are both arranged between the first side wall and the second side wall; the second box body forms a first opening and a second opening at both ends along the first direction; the first side wall closes the first opening, and the second side wall closes the second opening.

[0021] In the above solution, the first box body and the second box body are two components that enclose an internal space. The internal space is enclosed by connecting the first box body and the second box body to accommodate the first battery cell assembly and the second battery cell assembly. By providing the first side wall and the second side wall, on the one hand, components such as explosion-proof valves, water-cooled connectors, or high and low voltage connectors can be installed on the first side wall and / or the second side wall to meet the charging and discharging working requirements of the battery device. On the other hand, compared with setting a flange structure protruding in the first direction between the first box body and the second box body, by providing the first side wall to close the first opening and the second side wall to close the second opening, the space utilization rate of the battery device in the first direction can be improved, thereby increasing the energy density of the battery device.

[0022] According to some embodiments of the present application, the first side wall has a first inner surface facing the first battery cell assembly, a first outer surface facing away from the first battery cell assembly, and a first side surface connecting the first inner surface and the first outer surface. The second side wall has a second inner surface facing the first battery cell assembly, a second outer surface facing away from the first battery cell assembly, and a second side surface connecting the second inner surface and the second outer surface. The second box body includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are respectively located at two ends of the second box body along the first direction. The first connecting portion encloses a first opening, and the first connecting portion is connected to the first side surface. The second connecting portion encloses a second opening, and the second connecting portion is connected to the second side surface.

[0023] In the above solution, by providing the first connecting portion to connect the first side surface of the first side wall, a high connection reliability and sealing performance can be achieved between the second box body and the first box body. By providing the second connecting portion to connect the second side surface of the second side wall, a high connection reliability and sealing performance can be achieved between the second box body and the first box body.

[0024] According to some embodiments of the present application, the second box body includes a top wall and two third side walls. The two third side walls are arranged opposite to each other along the third direction. The top wall is connected to the two third side walls. One end of the third side wall away from the top wall is connected to the side surface of the bottom wall.

[0025] In the above solution, the third side wall and the side surface of the bottom wall are stacked along the third direction. By connecting one end of the third side wall of the second box body to the side surface of the bottom wall to realize the connection between the second box body and the first box body, the connection between the second box body and the first box body can be achieved without setting a flange structure protruding in the third direction, thereby improving the space utilization rate of the battery device in the third direction to accommodate more battery cells or reducing the volume of the battery device, and further increasing the energy density of the battery device.

[0026] According to some embodiments of the present application, a first flow channel is formed inside the bottom wall, and the first flow channel is used to accommodate a heat exchange medium; a second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium.

[0027] In the above solution, by accommodating the heat exchange medium in the first flow channel, heat exchange can be performed on the first battery cell assembly through the heat exchange medium in the first flow channel, so as to adjust the temperature of the first battery cell assembly, improve the charge and discharge cycle performance of the first battery cell assembly, and thus improve the reliability of the battery device; by accommodating the heat exchange medium in the second flow channel, heat exchange can be performed on the second battery cell assembly through the heat exchange medium in the second flow channel, so as to adjust the temperature of the second battery cell assembly, improve the charge and discharge cycle performance of the second battery cell assembly, and thus improve the reliability of the battery device.

[0028] According to some embodiments of the present application, the surface of the first battery cell perpendicular to the first direction is the surface with the largest area of the first battery cell.

[0029] In the above solution, during the charge and discharge cycle of the battery cell, the surface with the largest area in the battery cell expands to a relatively large extent; the surface of the first battery cell perpendicular to the first direction is the surface with the largest area of the first battery cell, and along the first direction, the first battery cell assembly is arranged between the first expansion beam and the second expansion beam, so as to constrain the expansion deformation of the first battery cell assembly through the first expansion beam and the second expansion beam, thereby improving the reliability of the battery device.

[0030] In a second aspect, an electrical device provided by an embodiment of the present application further includes the battery device provided by any of the above embodiments, and the battery device is used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0034] Figure 2Schematic exploded view of the battery device provided by some embodiments of the present application;

[0035] Figure 3 Cross-sectional view of the battery device provided by some embodiments of the present application;

[0036] Figure 4 Schematic view of a partial structure of the battery device provided by some embodiments of the present application;

[0037] Figure 5 is Figure 3 Local enlarged view of area A;

[0038] Figure 6 is Figure 3 Local enlarged view of area B;

[0039] Figure 7 Schematic view of the structure of the second box body provided by some embodiments of the present application.

[0040] Icons: 1000 - vehicle; 100 - battery device; 200 - controller; 300 - motor; 10 - box body; 10a - first accommodation space; 10b - second accommodation space; 10c - first box body; 10d - second box body; 10e - first opening; 10f - second opening; 10g - first connection part; 10h - second connection part; 11 - bottom wall; 111 - third side surface; 112 - first flow channel; 12 - first expansion beam; 121 - first mounting hole; 122 - first body; 123 - first convex part; 123a - first end convex part; 123b - second end convex part; 123c - first middle convex part; 13 - second expansion beam; 131 - second mounting hole; 14 - first side wall; 141 - first inner surface; 142 - first outer surface; 143 - first side surface; 143a - first flat surface; 143b - second flat surface; 143c - first transition surface; 15 - second side wall; 151 - second inner surface; 152 - second outer surface; 153 - second side surface; 153a - third flat surface; 153b - fourth flat surface; 153c - second transition surface; 16 - top wall; 17 - third side wall; 20 - bracket; 21 - support wall; 22 - third expansion beam; 221 - third mounting hole; 222 - second body; 223 - second convex part; 23 - fourth expansion beam; 23a - first end face; 23b - second end face; 231 - fourth mounting hole; 232 - cavity; 233 - partition wall; 24 - second flow channel; 30 - first locking part; 40 - second locking part; 50 - first battery cell assembly; 51 - first battery cell; 60 - second battery cell assembly; 61 - second battery cell; 71 - first binding part; 72 - second binding part; 81 - first sealing part; 82 - second sealing part; 83 - third sealing part; X - first direction; Y - third direction; Z - second direction. Detailed implementation manners

[0041] The following further describes the implementation manners of the present application in detail in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description of the present application, the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion.

[0043] The terms "first", "second", etc. in the description, the specification and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0044] Referring to "embodiments" in the present application means that the specific features, structures or characteristics described in combination with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0046] The term "and / or" in the present application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0047] The "multiple" mentioned in the present application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0048] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0049] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0050] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0051] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0052] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0053] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which may be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0054] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0055] As an example, the box body may be a part of the chassis structure of a vehicle. For example, the top cover of the box body may become at least a part of the floor of the vehicle, or the frame of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0056] In the embodiments of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0057] The battery cell may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0058] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted into and extracted from between the positive electrode and the negative electrode back and forth. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0059] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0060] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0061] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0064] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used.

[0065] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0066] As an example, the negative electrode active material can be a negative electrode active material for batteries well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0067] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0068] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0069] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0070] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a stacked structure.

[0072] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0073] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and substances such as the electrolyte. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0074] In some embodiments, at least one electrode terminal is provided on the outer shell, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap or on the housing.

[0075] In some embodiments, an explosion-proof valve is provided on the outer shell. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0076] In some embodiments, the outer shell can be a sealed structure or a non-sealed structure. As an example, when the outer shell is a sealed structure, the outer shell can protect the electrode assembly and prevent, for example, electrolyte leakage. When the outer shell is a non-sealed structure, the outer shell can protect the electrode assembly, and a sealing bag can be further included between the outer shell and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly, electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0077] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0078] The development of battery device technology needs to consider various design factors simultaneously. For example, performance parameters such as discharge capacity and charge-discharge rate. In addition, the energy density of the battery device also needs to be considered.

[0079] In some embodiments, the battery device includes a box body, a bracket, a first battery cell assembly, and a second battery cell assembly. The bracket divides the internal space of the box body into a first accommodation space and a second accommodation space. The first battery cell assembly is accommodated in the first accommodation space, and the second battery cell assembly is accommodated in the second accommodation space. In order to support the bracket, usually a boss is provided on the inner surface of the wall portion of the box body that encloses the first accommodation space. The boss is provided on the wall portion perpendicular to the stacking direction of the first battery cells of the first battery cell assembly. The bracket is connected to the boss, thereby realizing the assembly and fixation of the bracket. However, the setting of the boss occupies a part of the space in the first accommodation space, resulting in a low utilization rate of the first accommodation space and affecting the energy density of the battery device.

[0080] In view of this, in order to reduce the problem that the connection and fixation position of the bracket occupies the first accommodation space, resulting in a low energy density of the battery device, the present application provides a battery device, which includes a box body, a bracket, a first locking member, a second locking member, a first battery cell assembly and a second battery cell assembly. The box body includes a bottom wall, a first expansion beam and a second expansion beam. The first expansion beam and the second expansion beam are arranged at intervals along a first direction, and the first expansion beam and the second expansion beam are respectively connected to the bottom wall; the bracket is arranged in the box body and divides the internal space of the box body into a first accommodation space and a second accommodation space on both sides of the bracket. The first accommodation space and the second accommodation space are arranged along a second direction, and the second direction intersects the first direction; the first locking member is arranged along the second direction, and the bracket is connected to the first expansion beam through the first locking member; the second locking member is arranged along the second direction, and the bracket is connected to the second expansion beam through the second locking member; the first battery cell assembly includes a plurality of first battery cells stacked along the first direction. The first battery cell assembly is arranged in the first accommodation space, and the first battery cell assembly is arranged between the first expansion beam and the second expansion beam, and the bottom wall supports the first battery cell assembly; the second battery cell assembly includes a plurality of second battery cells stacked along the first direction. The second battery cell assembly is arranged in the second accommodation space, and the bracket supports the second battery cell assembly; the bracket includes a support wall, a third expansion beam and a fourth expansion beam. The support wall is located between the first battery cell assembly and the second battery cell assembly. The third expansion beam and the fourth expansion beam are arranged opposite to each other along the first direction and are respectively connected to the support wall. The support wall supports the second battery cell assembly, and the second battery cell assembly is arranged between the third expansion beam and the fourth expansion beam; the fourth expansion beam has a first end face facing away from the bottom wall and a second end face facing the bottom wall. Along the second direction, the second locking member penetrates through the first end face and the second end face and is connected to the second expansion beam, and the size of the second locking member is larger than the size of the fourth expansion beam.

[0081] In such a battery device, the inner space of the box body is divided into a first accommodation space and a second accommodation space by a bracket. The first accommodation space and the second accommodation space are arranged along a second direction. The first battery cell assembly is accommodated in the first accommodation space, and the second battery cell assembly is accommodated in the second accommodation space, which can improve the space utilization rate inside the box body in the second direction, so that more battery cells can be arranged in the battery device in the second direction, and the battery device has a higher energy density. The first expansion beam and the second expansion beam are arranged on both sides of the first battery cell assembly along a first direction, so as to facilitate restricting the expansion and deformation of the first battery cell assembly through the first expansion beam and the second expansion beam. The bracket is connected to the first expansion beam through a first locking member, and the bracket is connected to the second expansion beam through a second locking member. Using the first expansion beam and the second expansion beam to support the bracket can reduce the space occupation of the connection and fixing position of the bracket in the first accommodation space between the first expansion beam and the second expansion beam. For example, there is no need to provide a structure for connecting with the bracket in the direction perpendicular to both the first direction and the second direction of the box body, so that more active materials can be arranged in the first accommodation space between the first expansion beam and the second expansion beam, making the battery device have a higher energy density. Moreover, both the first locking member and the second locking member are arranged along the second direction, further reducing the space occupation of the connection and fixing position of the bracket in the first accommodation space between the first expansion beam and the second expansion beam, making the battery device have a higher energy density. The support wall supports the second battery cell assembly, provides positioning support for the second battery cell assembly, and reduces the risk of the second battery cell assembly moving inside the box body. The third expansion beam and the fourth expansion beam are arranged opposite to each other along the first direction and are respectively connected to the support wall. The second battery cell assembly is arranged between the third expansion beam and the fourth expansion beam, so as to facilitate restricting the expansion and deformation of the second battery cell assembly through the third expansion beam and the fourth expansion beam, thereby improving the reliability of the battery device. The size of the second locking member along the second direction is larger than the size of the fourth expansion beam. The second locking member penetrates through the fourth expansion beam in the second direction and then is connected to the second expansion beam, which can utilize the space inside the fourth expansion beam, reduce the space occupation of the second locking member on both sides of the fourth expansion beam along the first direction, and further improve the space utilization rate inside the battery device and the energy density of the battery device. At the same time, the second locking member and the fourth expansion beam have a large connection area, making the connection between the second locking member and the fourth expansion beam reliable and improving the connection reliability between the fourth expansion beam and the second expansion beam.

[0082] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships or aircraft. The power supply system of the power-consuming device can be composed of the battery device disclosed in the present application.

[0083] The electrical device may include mobile phones, portable devices, laptops, battery cars, electric toys, power tools, vehicles, ships, spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, spaceships, etc.

[0084] For the convenience of description, the following embodiments will take a vehicle as an example of an electrical device in an embodiment of the present application for illustration.

[0085] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be disposed at the bottom, the head or the tail of the vehicle 1000. The battery device 100 may be used for power supply of the vehicle 1000. For example, the battery device 100 may be used as an operating power source of the vehicle 1000 for the circuit system of the vehicle 1000, such as for the working power consumption requirements during starting, navigation and running of the vehicle 1000.

[0086] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power consumption requirements during starting, navigation and driving of the vehicle 1000.

[0087] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Please refer to Figures 2 to 6 , Figure 2 , which is an exploded schematic structural diagram of a battery device provided in some embodiments of the present application, Figure 3 , which is a sectional view of a battery device provided in some embodiments of the present application, Figure 4 , which is a schematic diagram of a partial structure of a battery device provided in some embodiments of the present application, Figure 5 is Figure 3 a partial enlarged view at A of Figure 6 is Figure 3Partial enlarged view at position B. An embodiment of the present application provides a battery device 100, which includes a box body 10, a bracket 20, a first locking member 30, a second locking member 40, a first battery cell assembly 50, and a second battery cell assembly 60. The box body 10 includes a bottom wall 11, a first expansion beam 12, and a second expansion beam 13. The first expansion beam 12 and the second expansion beam 13 are arranged at intervals along a first direction X. The first expansion beam 12 and the second expansion beam 13 are respectively connected to the bottom wall 11. The bracket 20 is disposed inside the box body 10 and divides the internal space of the box body 10 into a first accommodation space 10a and a second accommodation space 10b on both sides of the bracket 20. The first accommodation space 10a and the second accommodation space 10b are arranged along a second direction Z, and the second direction Z intersects with the first direction X. The first locking member 30 is arranged along the second direction Z, and the bracket 20 is connected to the first expansion beam 12 through the first locking member 30. The second locking member 40 is arranged along the second direction Z, and the bracket 20 is connected to the second expansion beam 13 through the second locking member 40. The first battery cell assembly 50 includes a plurality of first battery cells 51 stacked along the first direction X. The first battery cell assembly 50 is disposed in the first accommodation space 10a, and the first battery cell assembly 50 is disposed between the first expansion beam 12 and the second expansion beam 13. The bottom wall 11 supports the first battery cell assembly 50. The second battery cell assembly 60 includes a plurality of second battery cells 61 stacked along the first direction X. The second battery cell assembly 60 is disposed in the second accommodation space 10b, and the bracket 20 supports the second battery cell assembly 60. The bracket 20 includes a support wall 21, a third expansion beam 22, and a fourth expansion beam 23. The support wall 21 is located between the first battery cell assembly 50 and the second battery cell assembly 60. The third expansion beam 22 and the fourth expansion beam 23 are arranged opposite to each other along the first direction X and are respectively connected to the support wall 21. The support wall 21 supports the second battery cell assembly 60, and the second battery cell assembly 60 is disposed between the third expansion beam 22 and the fourth expansion beam 23. The fourth expansion beam 23 has a first end face 23a facing away from the bottom wall 11 and a second end face 23b facing the bottom wall 11. Along the second direction Z, the second locking member 40 penetrates through the first end face 23a and the second end face 23b and is connected to the second expansion beam 13. The size of the second locking member 40 is larger than the size of the fourth expansion beam 23.

[0089] In the figure, the direction indicated by the letter X is the first direction, and the first direction X may be parallel to the length direction of the battery device 100. The direction indicated by the letter Z is the second direction, and the second direction Z may be parallel to the height direction of the battery device 100.

[0090] The bottom wall 11 is the wall of the box body 10 for supporting the first battery cell assembly 50. Along the gravity direction, the bottom wall 11 may be the lowermost wall of the box body 10. The thickness direction of the bottom wall 11 may be parallel to the second direction Z.

[0091] In some embodiments, the second direction Z may be parallel to the direction of gravity.

[0092] The first expansion beam 12 and the second expansion beam 13 are beams capable of absorbing the expansion force of the first battery cell assembly 50.

[0093] The materials of the first expansion beam 12 and the second expansion beam 13 may both be metals, such as steel, aluminum alloy, etc., with relatively high strength; the materials of the first expansion beam 12 and the second expansion beam 13 may both be resin fiber composite materials, with relatively light weight and low cost.

[0094] The first expansion beam 12 and the second expansion beam 13 are arranged at intervals along the first direction X. The first expansion beam 12 and the second expansion beam 13 may be parallel to each other. For example, the surface of the first expansion beam 12 facing the first battery cell assembly 50 may be parallel to the surface of the second expansion beam 13 facing the first battery cell assembly 50, so as to facilitate restricting the expansion deformation of the first battery cell assembly 50 through the first expansion beam 12 and the second expansion beam 13.

[0095] In some embodiments, the first expansion beam 12 and the second expansion beam 13 may be connected to both ends of the bottom wall 11 in the first direction X. For example, the first expansion beam 12, the bottom wall 11, and the second expansion beam 13 may be arranged in sequence along the first direction X, and the first expansion beam 12 and the second expansion beam 13 are respectively connected to the two end faces of the bottom wall 11 in the first direction X.

[0096] In some embodiments, the material of the first expansion beam 12 is metal (such as steel, aluminum alloy, etc.). The first expansion beam 12 may be connected to the bottom wall 11 by welding, so that there is relatively high connection reliability between the first expansion beam 12 and the bottom wall 11; the material of the second expansion beam 13 is metal (such as steel, aluminum alloy, etc.). The second expansion beam 13 may be connected to the bottom wall 11 by welding, so that there is relatively high connection reliability between the second expansion beam 13 and the bottom wall 11.

[0097] The bracket 20 is a component for supporting the second battery cell assembly 60. At the same time, the thickness direction of the bracket 20 may be parallel to the second direction Z. The bracket 20 cooperates with the box body 10 to divide the internal space of the box body 10 into a first accommodation space 10a and a second accommodation space 10b arranged along the second direction Z. The first accommodation space 10a is used to accommodate the first battery cell assembly 50, and the second accommodation space 10b is used for the second battery cell assembly 60.

[0098] In some embodiments, the first accommodation space 10a and the second accommodation space 10b may be independent of each other, which can reduce the influence of thermal runaway of the first battery cell 51 on the second battery cell 61, or the influence of thermal runaway of the second battery cell 61 on the first battery cell 51.

[0099] In some embodiments, the angle between the second direction Z and the first direction X may be 85° to 95°. Optionally, the second direction Z may be perpendicular to the first direction X.

[0100] The first locking member 30 may be a threaded rod. For example, the first locking member 30 may be a bolt; alternatively, the first locking member 30 may also be a pin shaft.

[0101] The first locking member 30 is arranged along the second direction Z, and the length direction of the first locking member 30 is parallel to the second direction Z.

[0102] The second locking member 40 may be a threaded rod. For example, the second locking member 40 may be a bolt; alternatively, the second locking member 40 may also be a pin shaft.

[0103] The second locking member 40 is arranged along the second direction Z, and the length direction of the second locking member 40 is parallel to the second direction Z.

[0104] The two opposite ends of the bracket 20 arranged along the first direction X are respectively connected to the first expansion beam 12 and the second expansion beam 13, and the support of the bracket 20 can be realized through the first expansion beam 12 and the second expansion beam 13.

[0105] In this application, the first battery cell 51 and the second battery cell 61 may be battery cells with the same structure or battery cells with different structures. When the first battery cell 51 and the second battery cell 61 are not distinguished, the battery cells mentioned in the embodiments of this application are the general terms for the first battery cell 51 and the second battery cell 61.

[0106] In the battery device 100, multiple battery cells can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells.

[0107] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection between multiple battery cells.

[0108] The support wall 21 is a wall for supporting the second battery cell assembly 60, and the support wall 21 supports the second battery cell assembly 60. The thickness direction of the support wall 21 may be parallel to the second direction Z.

[0109] The third expansion beam 22 and the fourth expansion beam 23 are arranged at intervals along the first direction X, and the third expansion beam 22 and the fourth expansion beam 23 cooperate to absorb the expansion force of the second battery cell assembly 60.

[0110] The materials of the third expansion beam 22 and the fourth expansion beam 23 can be metals, such as steel, aluminum alloy, etc., which have relatively high strength; the materials of the first expansion beam 12 and the second expansion beam 13 can both be resin fiber composite materials, which have relatively light weight and low cost.

[0111] The third expansion beam 22 and the fourth expansion beam 23 are arranged at intervals along the first direction X. The third expansion beam 22 and the fourth expansion beam 23 can be parallel to each other. For example, the surface of the third expansion beam 22 facing the second battery cell assembly 60 can be parallel to the surface of the fourth expansion beam 23 facing the second battery cell assembly 60, so as to constrain the expansion and deformation of the second battery cell assembly 60 through the third expansion beam 22 and the fourth expansion beam 23.

[0112] In some embodiments, the third expansion beam 22 and the fourth expansion beam 23 can be connected to both ends of the support wall 21 in the first direction X. For example, the third expansion beam 22, the support wall 21, and the fourth expansion beam 23 can be arranged in sequence along the first direction X, and the third expansion beam 22 and the fourth expansion beam 23 are respectively connected to two end faces of the support wall 21 in the first direction X.

[0113] In some embodiments, the material of the third expansion beam 22 is metal (such as steel, aluminum alloy, etc.). The third expansion beam 22 can be welded to the support wall 21 to make the connection between the third expansion beam 22 and the support wall 21 have relatively high connection reliability; the material of the fourth expansion beam 23 is metal (such as steel, aluminum alloy, etc.). The fourth expansion beam 23 can be welded to the support wall 21 to make the connection between the fourth expansion beam 23 and the support wall 21 have relatively high connection reliability.

[0114] The first end face 23a and the second end face 23b are two opposite surfaces of the fourth expansion beam 23 in the second direction Z. The first end face 23a is farther from the bottom wall 11 than the other surfaces of the fourth expansion beam 23, and the second end face 23b is closer to the bottom wall 11 than the other surfaces of the fourth expansion beam 23. The second end face 23b is connected to the second expansion beam 13.

[0115] When the second locking member 40 is a bolt, the threaded portion of the bolt is threadedly connected to the second expansion beam 13, and the head of the bolt is connected to the first end face 23a.

[0116] The dimension of the second locking member 40 along the second direction Z is greater than that of the fourth expansion beam 23 along the second direction Z. The second locking member 40 has a larger dimension in the second direction Z so as to facilitate passing through the fourth expansion beam 23 and connecting with the second expansion beam 13. A part of the second locking member 40 can be accommodated in the fourth expansion beam 23, making rational use of the space inside the fourth expansion beam 23. The overall dimension of the fourth expansion beam 23 in the first direction X can be designed to be smaller, without the need to additionally provide a space for accommodating the second locking member 40 in the first direction X inside the box body 10, which is beneficial to improving the space utilization rate inside the box body 10 in the first direction X and facilitating the improvement of the energy density of the battery device 100.

[0117] In some embodiments, the fourth expansion beam 23 is connected to the support wall 21 in the first direction X, and the second end face 23b is connected to the second expansion beam 13. Combining with the second locking member 40 penetrating through the fourth expansion beam 23, so that the fourth expansion has a better constraint effect on the second battery cell assembly 60.

[0118] According to the battery device 100 of the embodiment of the present application, the inner space of the box body 10 is divided into a first accommodation space 10a and a second accommodation space 10b by the bracket 20. The first accommodation space 10a and the second accommodation space 10b are arranged along the second direction Z. The first battery cell assembly 50 is accommodated in the first accommodation space 10a, and the second battery cell assembly 60 is accommodated in the second accommodation space 10b, which can improve the space utilization rate inside the box body 10 in the second direction Z, so that more battery cells can be arranged in the battery device 100 in the second direction Z, and the battery device 100 has a higher energy density. The first expansion beam 12 and the second expansion beam 13 are arranged on both sides of the first battery cell assembly 50 along the first direction X, so as to facilitate restricting the expansion and deformation of the first battery cell assembly 50 through the first expansion beam 12 and the second expansion beam 13. The bracket 20 is connected to the first expansion beam 12 through the first locking member 30, and the bracket 20 is connected to the second expansion beam 13 through the second locking member 40. Using the first expansion beam 12 and the second expansion beam 13 to support the bracket 20 can reduce the space occupation of the connection and fixing position of the bracket 20 in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13. For example, there is no need to arrange a structure for connecting with the bracket 20 in the direction perpendicular to both the first direction X and the second direction Z of the box body 10, so that more active materials can be arranged in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13, making the battery device 100 have a higher energy density. And, both the first locking member 30 and the second locking member 40 are arranged along the second direction Z, further reducing the space occupation of the connection and fixing position of the bracket 20 in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13, making the battery device 100 have a higher energy density. The support wall 21 supports the second battery cell assembly 60, provides positioning support for the second battery cell assembly 60, and reduces the risk of the second battery cell assembly 60 moving inside the box body 10. The third expansion beam 22 and the fourth expansion beam 23 are arranged opposite to each other along the first direction X and are respectively connected to the support wall 21. The second battery cell assembly 60 is arranged between the third expansion beam 22 and the fourth expansion beam 23, so as to facilitate restricting the expansion and deformation of the second battery cell assembly 60 through the third expansion beam 22 and the fourth expansion beam 23, thereby improving the reliability of the battery device 100.The dimension of the second locking member 40 along the second direction Z is greater than that of the fourth expansion beam 23. The second locking member 40 penetrates through the fourth expansion beam 23 in the second direction Z and then connects to the second expansion beam 13, which can utilize the space inside the fourth expansion beam 23, reduce the space occupied by the second locking member 40 on both sides of the fourth expansion beam 23 along the first direction X, further improve the space utilization rate inside the battery device 100, and increase the energy density of the battery device 100. At the same time, the second locking member 40 and the fourth expansion beam 23 have a large connection area, making the connection between the second locking member 40 and the fourth expansion beam 23 reliable, and improving the connection reliability between the fourth expansion beam 23 and the second expansion beam 13.

[0119] It should be noted that the first expansion beam 12, the second expansion beam 13, the third expansion beam 22, and the fourth expansion beam 23 are all structures with hollow interiors to facilitate resisting the expansion force of the battery cells.

[0120] Please refer to Figures 3 to 6 , according to some embodiments of the present application, the first expansion beam 12 is provided with a first mounting hole 121, and the second expansion beam 13 is provided with a second mounting hole 131; the third expansion beam 22 is provided with a third mounting hole 221 corresponding to the first mounting hole 121. The first locking member 30 passes through the third mounting hole 221 and is connected to the first mounting hole 121. The fourth expansion beam 23 is provided with a fourth mounting hole 231 corresponding to the second mounting hole 131. Along the second direction Z, the fourth mounting hole 231 penetrates through the first end face 23a and the second end face 23b, and the second locking member 40 passes through the fourth mounting hole 231 and is connected to the second mounting hole 131.

[0121] The centerlines of the first mounting hole 121 and the third mounting hole 221 both extend along the second direction Z.

[0122] In some embodiments, the third mounting hole 221 can be a through hole, the first mounting hole 121 can be a threaded hole, and the first locking member 30 can be a bolt. The first locking member 30 passes through the third mounting hole 221 and is threadedly connected to the first mounting hole 121 for easy assembly and disassembly and convenient maintenance and replacement. Among them, the first mounting hole 121 can be a threaded hole opened in the first expansion beam 12, or the first mounting hole 121 can be a threaded hole of a nut embedded in the first expansion beam 12.

[0123] The centerlines of the second mounting hole 131 and the fourth mounting hole 231 both extend along the second direction Z.

[0124] In some embodiments, the fourth mounting hole 231 may be a through hole, the second mounting hole 131 may be a threaded hole, and the second locking member 40 may be a bolt. The second locking member 40 passes through the fourth mounting hole 231 and is threadedly connected to the second mounting hole 131, facilitating assembly and disassembly and facilitating maintenance and replacement. Among them, the second mounting hole 131 may be a threaded hole formed in the second expansion beam 13, or the second mounting hole 131 may be a threaded hole of a nut embedded in the second expansion beam 13.

[0125] The fourth mounting hole 231 penetrates through the first end face 23a and the second end face 23b. When the second locking member 40 passes through the fourth mounting hole 231, the second locking member 40 first passes through the first end face 23a and then passes through the second end face 23b and enters the second mounting hole 131.

[0126] In some embodiments, the structure of the first expansion beam 12 may be the same as that of the second expansion beam 13, or the structure of the first expansion beam 12 may be different from that of the second expansion beam 13. Correspondingly, the structure of the third expansion beam 22 may be the same as that of the fourth expansion beam 23, or the structure of the third expansion beam 22 may be different from that of the fourth expansion beam 23.

[0127] In the above solution, the first locking member 30 passes through the third mounting hole 221 and is connected to the first mounting hole 121, facilitating assembly and disassembly and enabling a relatively high connection reliability between the third expansion beam 22 and the first expansion beam 12; the fourth mounting hole 231 penetrates through the first end face 23a and the second end face 23b along the second direction Z, enabling the utilization of the space inside the fourth expansion beam 23, reducing the space occupied by the fourth mounting hole 231 on both sides of the fourth expansion beam 23 along the first direction X. The second locking member 40 passes through the fourth mounting hole 231 and is connected to the second mounting hole 131, facilitating assembly and disassembly and enabling a relatively high connection reliability between the fourth expansion beam 23 and the second expansion beam 13.

[0128] Please refer to Figures 3 to 5 , according to some embodiments of the present application, the first expansion beam 12 includes a first body 122 and a first convex portion 123. The first convex portion 123 is formed on the side of the first body 122 facing away from the first battery cell assembly 50, and the first mounting hole 121 is provided in the first convex portion 123; the third expansion beam 22 includes a second body 222 and a second convex portion 223. The second convex portion 223 is formed on the side of the second body 222 facing away from the second battery cell assembly 60, and the third mounting hole 221 penetrates through the second convex portion 223 along the second direction Z.

[0129] The first convex portion 123 is formed on a side of the first body 122 facing away from the first battery cell assembly 50. The first convex portion 123 can be integrally formed with the first body 122. For example, the first convex portion 123 and the first body 122 are integrally extruded to make the first expansion beam 12 have a relatively high strength as a whole.

[0130] In some other embodiments, the first convex portion 123 can also be connected to the first body 122 by welding to make the connection reliability between the first convex portion 123 and the first body 122 relatively high.

[0131] In some embodiments, along the second direction Z, the first convex portion 123 is located at one end of the first body 122 close to the third expansion beam 22 to facilitate the connection between the first convex portion 123 and the third expansion beam 22. Along the second direction Z, the size of the first convex portion 123 is smaller than that of the first body 122, and along the direction from the bottom wall 11 to the bracket 20, the first body 122 extends beyond the first convex portion 123 so that the first convex portion 123 occupies a relatively small space in the second direction Z.

[0132] The first mounting hole 121 can be a threaded hole provided in the first convex portion 123.

[0133] The second convex portion 223 is formed on a side of the second body 222 facing away from the second battery cell assembly 60. The second convex portion 223 can be integrally formed with the second body 222. For example, the second convex portion 223 and the second body 222 are integrally extruded to make the third expansion beam 22 have a relatively high strength as a whole.

[0134] In some other embodiments, the second convex portion 223 can also be connected to the second body 222 by welding to make the connection reliability between the second convex portion 223 and the second body 222 relatively high.

[0135] In some embodiments, along the second direction Z, the second convex portion 223 is located at one end of the second body 222 close to the first expansion beam 12 to facilitate the connection between the second convex portion 223 and the first expansion beam 12. Along the second direction Z, the size of the second convex portion 223 is smaller than that of the second body 222, and along the direction from the bottom wall 11 to the bracket 20, the second body 222 extends beyond the second convex portion 223 so that the second convex portion 223 occupies a relatively small space in the second direction Z.

[0136] The third mounting hole 221 can be a through hole provided in the second convex portion 223.

[0137] In the above solution, the first convex portion 123 is formed on a side of the first body 122 facing away from the first battery cell assembly 50, and the first mounting hole 121 is provided in the first convex portion 123, which can reduce the occupation of the connection position between the bracket 20 and the first expansion beam 12 on the side of the first expansion beam 12 facing the first battery cell assembly 50, improve the space utilization rate between the first expansion beam 12 and the second expansion beam 13, and enable the battery device 100 to have a high energy density; the second convex portion 223 is formed on a side of the second body 222 facing away from the second battery cell assembly 60, and the third mounting hole 221 penetrates through the second convex portion 223 along the second direction Z, so that the third mounting hole 221 and the first mounting hole 121 are arranged corresponding to each other along the second direction Z. The first fastener can penetrate through the third mounting hole 221 along the second direction Z and be connected to the first mounting hole 121, which is convenient for operation, can reduce the risk of interference between the first fastener connecting the bracket 20 and the first expansion beam 12 and the second battery cell assembly 60 and the first battery cell assembly 50, and a relatively large amount of active material can be arranged in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13, and a relatively large amount of active material can be arranged in the second accommodation space 10b between the third expansion beam 22 and the fourth expansion beam 23, so that the battery device 100 has a high energy density.

[0138] According to some embodiments of the present application, the structure of the second expansion beam 13 may be the same as the structure of the first expansion beam 12. The second expansion beam 13 may include a third body (not shown in the figure) and a third convex portion (not shown in the figure). The third convex portion is formed on a side of the third body facing away from the first battery cell assembly 50, and the second mounting hole 131 is provided in the third convex portion; the structure of the fourth expansion beam 23 may be the same as the structure of the third expansion beam 22. The fourth expansion beam 23 may include a fourth body and a fourth convex portion. The fourth convex portion is formed on a side of the fourth body facing away from the second battery cell assembly 60, and the fourth mounting hole 231 penetrates through the fourth convex portion along the second direction Z.

[0139] In the above solution, the third convex portion is formed on a side of the third body facing away from the first battery cell assembly 50, and the second mounting hole 131 is provided in the third convex portion, which can reduce the occupation of the connection position between the bracket 20 and the second expansion beam 13 on the side of the second expansion beam 13 facing the first battery cell assembly 50, improve the space utilization rate between the first expansion beam 12 and the second expansion beam 13, and enable the battery device 100 to have a high energy density; the fourth convex portion is formed on a side of the fourth body facing away from the second battery cell assembly 60, and the fourth mounting hole 231 penetrates through the fourth convex portion along the second direction Z, so that the fourth mounting hole 231 and the second mounting hole 131 are arranged corresponding to each other along the second direction Z. The second fastener can penetrate through the fourth mounting hole 231 along the second direction Z and be connected to the second mounting hole 131, which is convenient for operation, can reduce the risk of interference between the second fastener connecting the bracket 20 and the second expansion beam 13 and the second battery cell assembly 60 and the first battery cell assembly 50, and a large amount of active material can be arranged in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13, and a large amount of active material can be arranged in the second accommodation space 10b between the third expansion beam 22 and the fourth expansion beam 23, so that the battery device 100 has a high energy density.

[0140] Please refer to Figure 4 , according to some embodiments of the present application, the number of the first convex portions 123 is multiple, the multiple first convex portions 123 are arranged at intervals along the third direction Y, and at least one first mounting hole 121 is provided on each first convex portion 123; and / or, the number of the second convex portions 223 is multiple, the multiple second convex portions 223 are arranged at intervals along the third direction Y, and at least one third mounting hole 221 is provided on each second convex portion 223; the third direction Y, the second direction Z and the first direction X are perpendicular to each other in pairs.

[0141] The direction indicated by the letter Y is the third direction, and the third direction Y can be parallel to the width direction of the battery device 100.

[0142] The multiple first convex portions 123 are arranged at intervals along the third direction Y, and an avoidance space can be formed between two adjacent first convex portions 123 to facilitate avoiding other components in the box body 10 through the avoidance space.

[0143] Each first convex portion 123 can be provided with one first mounting hole 121 or multiple first mounting holes 121; when each first convex portion 123 is provided with multiple first mounting holes 121, the multiple first mounting holes 121 can be arranged at intervals along the third direction Y.

[0144] The multiple first convex portions 123 can be at least distributed at both ends and the middle of the first expansion beam 12 in the third direction Y to make the connection between the third expansion beam 22 and the first expansion beam 12 firm.

[0145] In some embodiments, please refer to Figure 4 , the plurality of first convex portions 123 include a first end convex portion 123a, a second end convex portion 123b, and a first middle convex portion 123c. The first end convex portion 123a and the second end convex portion 123b are respectively located at opposite ends of the first body 122 in the third direction Y, and the first middle convex portion 123c is located between the first end convex portion 123a and the second end convex portion 123b. Along the third direction Y, the sizes of the first end convex portion 123a and the second end convex portion 123b can be respectively smaller than the size of the first middle convex portion 123c, so that the first middle convex portion 123c has a larger connection area with the third expansion beam 22, making the connection between the first middle convex portion 123c and the third expansion beam 22 firm; when the connection reliability between the first expansion beam 12 and the third expansion beam 22 is satisfied, a relatively large gap can be provided between the first end convex portion 123a and the first middle convex portion 123c, and a relatively large gap can be provided between the second end convex portion 123b and the first middle convex portion 123c to facilitate avoiding other components inside the box body 10.

[0146] Correspondingly, the positions of the plurality of second convex portions 223 can correspond to the positions of the plurality of first convex portions 123, and each second convex portion 223 is connected to a first convex portion 123. On the same projection plane perpendicular to the second direction Z, the orthographic projection of each second convex portion 223 can fall within the orthographic projection of the corresponding first convex portion 123.

[0147] Each second convex portion 223 can be provided with one third mounting hole 221, or can be provided with a plurality of third mounting holes 221; when each second convex portion 223 is provided with a plurality of third mounting holes 221, the plurality of third mounting holes 221 can be arranged at intervals along the third direction Y.

[0148] For example, the first middle convex portion 123c can be provided with a plurality of first mounting holes 121, and the plurality of first mounting holes 121 are arranged at intervals along the third direction Y. The second convex portion 223 corresponding to the first middle convex portion 123c can be provided with a plurality of third mounting holes 221, and the plurality of third mounting holes 221 are arranged at intervals along the third direction Y.

[0149] In the above solution, by arranging a plurality of first convex portions 123 at intervals in the third direction Y, and each first convex portion 123 is provided with at least one first mounting hole 121, other components inside the box body 10 (such as connecting cables, output poles, binding members, etc.) can be avoided in the third direction Y while meeting the connection reliability between the bracket 20 and the first expansion beam 12; by arranging a plurality of second convex portions 223 at intervals in the third direction Y, and each second convex portion 223 is provided with at least one third mounting hole 221, other components inside the box body 10 (such as connecting cables, output poles, binding members, etc.) can be avoided in the third direction Y while meeting the connection reliability between the bracket 20 and the first expansion beam 12.

[0150] According to some embodiments of the present application, on the basis that the fourth mounting hole 231 penetrates through the first end face 23a and the second end face 23b, the third expansion beam 22 may have a third end face facing away from the bottom wall 11 and a fourth end face facing the bottom wall 11. Along the second direction Z, the third mounting hole 221 penetrates through the third end face and the fourth end face, and the size of the first locking member 30 is larger than the size of the third expansion beam 22.

[0151] In this embodiment, the third mounting hole 221 penetrates through the third end face and the fourth end face along the second direction Z, which can utilize the space inside the third expansion beam 22 and reduce the space occupied by the third mounting hole 221 on both sides of the third expansion beam 22 along the first direction X; the size of the first locking member 30 along the second direction Z is larger than the size of the third expansion beam 22. The first locking member 30 penetrates through the third expansion beam 22 along the second direction Z and is then connected to the first mounting hole 121 on the first expansion beam 12. The first locking member 30 and the third expansion beam 22 have a large connection area, making the connection between the first locking member 30 and the third expansion beam 22 reliable and improving the connection reliability between the third expansion beam 22 and the first expansion beam 12.

[0152] Please refer to Figure 6 , according to some embodiments of the present application, a plurality of cavities 232 arranged along the second direction Z are formed inside the fourth expansion beam 23. Adjacent two cavities 232 are separated by a partition wall 233, and the fourth mounting hole 231 penetrates through the partition wall 233.

[0153] The partition wall 233 may be a reinforcing rib formed inside the fourth expansion beam 23. The fourth expansion beam 23 includes a first wall facing the second battery cell assembly 60 and a second wall facing away from the second battery cell assembly 60. The partition wall 233 may connect the inner surfaces of the first wall and the second wall to improve the overall strength of the fourth expansion beam 23.

[0154] A plurality of partition walls 233 are arranged at intervals along the second direction Z to divide the interior of the fourth expansion into a plurality of cavities 232 arranged along the second direction Z.

[0155] When the fourth mounting hole 231 penetrates the fourth expansion beam 23 along the second direction Z, the fourth mounting hole 231 extends from the first end face 23a towards the second end face 23b and penetrates the partition wall 233. The fourth mounting hole 231 penetrates a plurality of partition walls 233. When the second locking member 40 is inserted into the fourth mounting hole 231, the partition wall 233 can play a role in positioning the second locking member 40.

[0156] In the above solution, a plurality of cavities 232 are arranged along the second direction Z, and two adjacent cavities 232 are separated by a partition wall 233, so that the fourth expansion beam 23 can absorb the expansion of the second battery cell assembly 60 along the first direction X, improving the reliability of the second battery cell assembly 60; the fourth mounting hole 231 penetrates the partition wall 233 to facilitate the positioning of the second locking member 40 and improve the connection reliability between the second locking member 40 and the fourth expansion beam 23.

[0157] Please refer to Figures 2 to 4 , according to some embodiments of the present application, the box body 10 further includes a first side wall 14 and a second side wall 15 that are oppositely arranged along the first direction X. The first side wall 14 and the second side wall 15 are respectively connected to the bottom wall 11. The first expansion beam 12 and the second expansion beam 13 are arranged between the first side wall 14 and the second side wall 15. The first expansion beam 12 is closer to the first side wall 14 than the second expansion beam 13; along the first direction X, the distance between the first expansion beam 12 and the first side wall 14 is greater than the distance between the second expansion beam 13 and the second side wall 15.

[0158] The first side wall 14 and the second side wall 15 are oppositely arranged along the first direction X, and the first side wall 14 and the second side wall 15 can serve as two side beams of the box body 10.

[0159] The first expansion beam 12 is closer to the first side wall 14 than the second expansion beam 13. The first expansion beam 12 is correspondingly arranged with the first side wall 14, and the second expansion beam 13 is correspondingly arranged with the second side wall 15.

[0160] The distance between the first expansion beam 12 and the first side wall 14 is greater than the distance between the second expansion beam 13 and the second side wall 15, so that there is a relatively large space between the first expansion beam 12 and the first side wall 14. This space can accommodate other components inside the box body 10, such as a high-voltage box, a power management system, a cooling water circulation pipeline, etc. In this case, the connection manner between the first expansion beam 12 and the third expansion beam 22 can adopt the connection manner of the first convex portion 123 and the second convex portion 223 to utilize the space between the first expansion beam 12 and the first side wall 14.

[0161] In the above solution, the first side wall 14 and the second side wall 15 are respectively connected to the bottom wall 11. The first side wall 14 and the second side wall 15 form side beams of the box body 10, so as to form a protection structure for the components inside the box body 10 at both ends in the first direction X; the distance between the first expansion beam 12 and the first side wall 14 is greater than the distance between the second expansion beam 13 and the second side wall 15. There is a relatively large space between the first expansion beam 12 and the first side wall 14. By arranging the first convex portion 123 on the side of the first body 122 facing away from the first battery cell assembly 50, the space between the first expansion beam 12 and the first side plate can be utilized to reduce the occupation of the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13 by the first locking member 30, so that more active materials can be arranged in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13, which is convenient for improving the energy density of the battery device 100.

[0162] Please refer to Figure 4 , according to some embodiments of the present application, the battery device 100 further includes a first restraint member 71. Both ends of the first restraint member 71 are respectively connected to the first expansion beam 12 and the second expansion beam 13, and the first restraint member 71 is connected to the side of the first battery cell 51 facing away from the bottom wall 11; the battery device 100 further includes a second restraint member 72. Both ends of the second restraint member 72 are respectively connected to the third expansion beam 22 and the fourth expansion beam 23, and the second restraint member 72 is connected to the side of the second battery cell 61 facing away from the support wall 21.

[0163] The first restraint member 71 is arranged along the first direction X. Both ends of the first restraint member 71 are respectively connected to the first expansion beam 12 and the second expansion beam 13, and the first restraint member 71 is connected to the side of the first battery cell 51 facing away from the bottom wall 11 to form a restraint on the first battery cell 51 and limit the movement of the first battery cell 51 in the direction away from the bottom wall 11.

[0164] The first restraint member 71 has an initial pre-tensioning force on both the first expansion beam 12 and the second expansion beam 13. When the first expansion beam 12 and the second expansion beam 13 resist the expansion force of the first battery cell assembly 50, the pre-tensioning force provided by the first restraint member 71 will share part of the expansion force, reduce the force on the first expansion beam 12 and the second expansion beam 13, and effectively control the expansion of the first battery cell 51.

[0165] The material of the first restraint member 71 can be metal to have a relatively high tensile capacity. An insulating member or insulating layer can be arranged on the surface of the first restraint member 71 to separate the first restraint member 71 and the first battery cell 51.

[0166] The second restraint member 72 is arranged along the first direction X. Two ends of the second restraint member 72 are respectively connected to the third expansion beam 22 and the fourth expansion beam 23. The second restraint member 72 is connected to a side of the second battery cell 61 facing away from the support wall 21, so as to form a restraint on the second battery cell 61 and limit the movement of the second battery cell 61 in a direction away from the support wall 21.

[0167] The second restraint member 72 has an initial pre-tensioning force on both the third expansion beam 22 and the fourth expansion beam 23. When the third expansion beam 22 and the fourth expansion beam 23 resist the expansion force of the second battery cell assembly 60, the pre-tensioning force provided by the second restraint member 72 will share part of the expansion force, reduce the force on the third expansion beam 22 and the fourth expansion beam 23, and effectively control the expansion of the second battery cell 61.

[0168] The material of the second restraint member 72 can be metal to have a high tensile capacity. An insulating member or insulating layer can be arranged on the surface of the second restraint member 72 to separate the second restraint member 72 and the second battery cell 61.

[0169] In the above solution, two ends of the first restraint member 71 are respectively connected to the first expansion beam 12 and the second expansion beam 13, which can improve the restraint effect of the first expansion beam 12 and the second expansion beam 13 on the expansion deformation of the first battery cell assembly 50. And the first restraint member 71 is connected to a side of the first battery cell 51 facing away from the bottom wall 11, which can limit the movement of the first battery cell 51 toward the side away from the bottom wall 11 to improve the reliability of the first battery cell assembly 50; two ends of the second restraint member 72 are respectively connected to the third expansion beam 22 and the fourth expansion beam 23, which can improve the restraint effect of the third expansion beam 22 and the fourth expansion beam 23 on the expansion deformation of the second battery cell assembly 60. And the second restraint member 72 is connected to a side of the second battery cell 61 facing away from the support wall 21, which can limit the movement of the second battery cell 61 toward the side away from the support wall 21 to improve the reliability of the second battery cell assembly 60.

[0170] On the first expansion beam 12, the first mounting hole 121 is arranged at an interval from the mounting hole on the first expansion beam 12 for connecting the first restraint member 71, so as to reduce the risk of interference between the first locking member 30 and the first restraint member 71; on the second expansion beam 13, the second mounting hole 131 is arranged at an interval from the mounting hole on the second expansion beam 13 for connecting the first restraint member 71, so as to reduce the risk of interference between the second locking member 40 and the first restraint member 71; on the third expansion beam 22, the third mounting hole 221 is arranged at an interval from the mounting hole on the third expansion beam 22 for connecting the second restraint member 72, so as to reduce the risk of interference between the first locking member 30 and the second restraint member 72; on the fourth expansion beam 23, the fourth mounting hole 231 is arranged at an interval from the mounting hole on the fourth expansion beam 23 for connecting the second restraint member 72, so as to reduce the risk of interference between the second locking member 40 and the second restraint member 72.

[0171] Please refer to Figure 2 and Figure 3 and further refer to Figure 7 , Figure 7 FIG. is a schematic structural view of the second box body provided for some embodiments of the present application. According to some embodiments of the present application, the box body 10 includes a first box body 10c and a second box body 10d, and the first box body 10c and the second box body 10d are connected to each other and enclose an internal space; the first box body 10c includes a bottom wall 11, a first side wall 14 and a second side wall 15, the first side wall 14 and the second side wall 15 are oppositely arranged along a first direction X, the first side wall 14 and the second side wall 15 are respectively connected to the bottom wall 11, and the first battery cell assembly 50 and the second battery cell assembly 60 are both arranged between the first side wall 14 and the second side wall 15; both ends of the second box body 10d along the first direction X respectively form a first opening 10e and a second opening 10f; the first side wall 14 closes the first opening 10e, and the second side wall 15 closes the second opening 10f.

[0172] The second direction Z may be the height direction of the battery device 100, and the first direction X may be the length direction of the battery device 100.

[0173] The first box body 10c and the second box body 10d are buckled with each other, and the first box body 10c and the second box body 10d are hermetically connected.

[0174] The first side wall 14 and the second side wall 15 are oppositely arranged along the first direction X, and the first side wall 14 and the second side wall 15 are respectively connected to the bottom wall 11 to form a U-shaped structure.

[0175] The first side wall 14 may be connected to the bottom wall 11 by welding or bonding. The second side wall 15 may be connected to the bottom wall 11 by welding or bonding.

[0176] The bottom wall 11 has a first surface facing the first battery cell assembly 50, the first side wall 14 protrudes from the first surface along the direction in which the bottom wall 11 points to the first battery cell assembly 50, and the second side wall 15 protrudes from the first surface along the direction in which the bottom wall 11 points to the first battery cell assembly 50.

[0177] The first side wall 14 and the second side wall 15 can improve the structural strength of the first box body 10. In some embodiments, the first side wall 14 and / or the second side wall 15 can be installed with components such as explosion-proof valves, water-cooled connectors or high and low voltage connectors to meet the charging and discharging working requirements of the battery device 100.

[0178] The first opening 10e may be a notch-shaped portion of the second box body 10d corresponding to the first side wall 14, and the second opening 10f may be a notch-shaped portion of the second box body 10d corresponding to the second side wall 15. The first side wall 14 can correspondingly close the first opening 10e, and the second side wall 15 can correspondingly close the second opening 10f, avoiding additional interference or overlapping parts in the battery device 100, so as to improve the utilization rate of the manufacturing materials of the battery device 100 and make the battery device 100 have a lower manufacturing cost; at the same time, it also avoids the occurrence of additional interference or overlapping parts in the battery device 100 causing space waste. In some embodiments, the cross-sectional shape of the second box body 10d may be U-shaped.

[0179] In the above solution, the first box body 10c and the second box body 10d are two components enclosing the internal space. The internal space is enclosed by connecting the first box body 10c and the second box body 10d to accommodate the first battery cell assembly 50 and the second battery cell assembly 60; by providing the first side wall 14 and the second side wall 15, on the one hand, components such as explosion-proof valves, water-cooled connectors or high and low voltage connectors can be installed on the first side wall 14 and / or the second side wall 15 to meet the charging and discharging working requirements of the battery device 100; on the other hand, compared with setting a flange structure protruding along the first direction X between the first box body 10c and the second box body 10d, by providing the first side wall 14 to close the first opening 10e and the second side wall 15 to close the second opening 10f, the space utilization rate of the battery device 100 in the first direction X can be improved, thereby improving the energy density of the battery device 100.

[0180] Please refer to Figure 4 and Figure 7 According to some embodiments of the present application, the first side wall 14 has a first inner surface 141 facing the first battery cell assembly 50, a first outer surface 142 facing away from the first battery cell assembly 50, and a first side surface 143 connecting the first inner surface 141 and the first outer surface 142. The second side wall 15 has a second inner surface 151 facing the first battery cell assembly 50, a second outer surface 152 facing away from the first battery cell assembly 50, and a second side surface 153 connecting the second inner surface 151 and the second outer surface 152; the second box body 10d includes a first connecting portion 10g and a second connecting portion 10h. The first connecting portion 10g and the second connecting portion 10h are respectively located at both ends of the second box body 10d along the first direction X. The first connecting portion 10g encloses the first opening 10e, and the first connecting portion 10g is connected to the first side surface 143. The second connecting portion 10h encloses the second opening 10f, and the second connecting portion 10h is connected to the second side surface 153.

[0181] The first side surface 143 may be an outer peripheral surface of the first sidewall 14 located between the first inner surface 141 and the first outer surface 142. The outer peripheral surface of the first sidewall 14 may refer to an outer surface of the first sidewall 14 in the second direction Z and the third direction Y.

[0182] The second side surface 153 may be an outer peripheral surface of the second sidewall 15 located between the second inner surface 151 and the second outer surface 152. The outer peripheral surface of the second sidewall 15 may refer to an outer surface of the second sidewall 15 in the second Z direction and the third Y direction.

[0183] The first connection portion 10g is located at the end of the second box body 10d in the first direction X, and surrounds the first opening 10e of the second box body 10d. The contour of the first connection portion 10g matches the first side surface 143 of the first side wall 14.

[0184] The second connection portion 10 h is located at the end of the second box body 10 d in the first direction X, and surrounds the second opening 10 f of the second box body 10 d . The contour of the second connection portion 10 h matches the second side surface 153 of the second side wall 15 .

[0185] “The first connection portion 10 g is connected to the first side surface 143 ” may mean that in the first direction X, the second box body 10 d and the first box body 10 c are connected to each other via the first connection portion 10 g and the first side surface 143 .

[0186] “The second connection portion 10 h is connected to the second side surface 153 ” may mean that in the first direction X, the second box body 10 d and the first box body 10 c are connected to each other through the second connection portion 10 h and the second side surface 153 .

[0187] The first connection portion 10g may be in the form of a sheet, and is in contact with the first side surface 143. In some embodiments, the first connection portion 10g and the first side surface 143 are connected in a surface-to-surface manner.

[0188] The second connection portion 10h may be in the form of a sheet, and is in contact with the second side surface 153. In some embodiments, the second connection portion 10h and the second side surface 153 are connected in a surface-to-surface manner.

[0189] In the above scheme, by setting the first connecting part 10g to connect the first side surface 143 of the first side wall 14, the second box body 10d and the first box body 10c can have higher connection reliability and sealing; by setting the second connecting part 10h to connect the second side surface 153 of the second side wall 15, the second box body 10d and the first box body 10c can have higher connection reliability and sealing.

[0190] Please refer to Figure 4, according to some embodiments of the present application, the first side surface 143 includes a first flat surface 143a, a second flat surface 143b, and a first transition surface 143c. The first flat surface 143a is disposed at one end of the first side wall 14 away from the bottom wall 11. The two second flat surfaces 143b are respectively disposed at both ends of the first side wall 14 along the third direction Y. The first transition surface 143c connects the first flat surface 143a and the second flat surface 143b to enable a smooth transition between the first flat surface 143a and the second flat surface 143b.

[0191] The first flat surface 143a may be the upper surface of the first side wall 14, and it may be a flat surface. The second flat surface 143b may be the outer side surface of the first side wall 14, and it may be a flat surface. In some embodiments, the first flat surface 143a and the second flat surface 143b may be perpendicular to each other. The first transition surface 143c is the part connecting the first flat surface 143a and the second flat surface 143b, and it can enable a smooth transition between the first flat surface 143a and the second flat surface 143b. A smooth transition may mean that the first flat surface 143a and the second flat surface 143b are in a non-right-angle transition relationship.

[0192] In some embodiments, the first transition surface 143c may be an arc surface or an inclined surface.

[0193] The first flat surface 143a and the second flat surface 143b are non-coplanar surfaces. Therefore, by providing the first transition surface 143c to enable a smooth transition between the first flat surface 143a and the second flat surface 143b, it is beneficial to form a good sealing surface between the first connecting portion 10g and the first side surface 143, and improve the sealing performance of the battery device 100.

[0194] Please refer to Figure 4 , according to some embodiments of the present application, the second side surface 153 includes a third flat surface 153a, a fourth flat surface 153b, and a second transition surface 153c. The third flat surface 153a is disposed at one end of the second side wall 15 away from the bottom wall 11. The two fourth flat surfaces 153b are respectively disposed at both ends of the second side wall 15 along the third direction Y. The second transition surface 153c connects the third flat surface 153a and the fourth flat surface 153b to enable a smooth transition between the third flat surface 153a and the fourth flat surface 153b.

[0195] The third flat surface 153a may be the upper surface of the second side wall 15, which may be a flat surface. The fourth flat surface 153b may be the outer side surface of the second side wall 15, which may be a flat surface. In some embodiments, the third flat surface 153a and the fourth flat surface 153b may be perpendicular to each other. The second transition surface 153c is the part connecting the third flat surface 153a and the fourth flat surface 153b, which can enable the third flat surface 153a and the fourth flat surface 153b to have a smooth transition. The smooth transition may mean that the third flat surface 153a and the fourth flat surface 153b are in a non-right-angle transition relationship.

[0196] In some embodiments, the second transition surface 153c may be an arc surface or an inclined surface.

[0197] The third flat surface 153a and the fourth flat surface 153b are non-coplanar surfaces. Therefore, by providing the second transition surface 153c to enable the third flat surface 153a and the fourth flat surface 153b to have a smooth transition, it is beneficial to form a good sealing surface between the second connecting portion 10h and the second side surface 153, thereby improving the sealing performance of the battery device 100.

[0198] According to some embodiments of the present application, the first connecting portion 10g is hermetically connected to the first side wall 14, and the second connecting portion 10h is hermetically connected to the second side wall 15.

[0199] For example, a first sealant is provided between the first connecting portion 10g and the first side surface 143 of the first side wall 14, and the first connecting portion 10g and the first side surface 143 are hermetically connected through the first sealant. A second sealant is provided between the second connecting portion 10h and the second side surface 153 of the second side wall 15, and the second connecting portion 10h and the second side surface 153 are hermetically connected through the second sealant.

[0200] For another example, a first seal 81 (please refer to Figure 2 ) is provided between the first connecting portion 10g and the first side surface 143 of the first side wall 14. The first connecting portion 10g and the first side wall 14 are connected by a third locking member, and the first connecting portion 10g and the first side surface 143 are hermetically engaged through the first seal 81. A second seal 82 (please refer to Figure 2 ) is provided between the second connecting portion 10h and the second side surface 153 of the second side wall 15. The second connecting portion 10h and the second side wall 15 are connected by a fourth locking member, and the second connecting portion 10h and the second side surface 153 are hermetically engaged through the second seal 82.

[0201] Please refer to Figure 2 and Figure 7, according to some embodiments of the present application, the second box body 10d includes a top wall 16 and two third side walls 17. The two third side walls 17 are oppositely arranged along the third direction Y. The top wall 16 connects the two third side walls 17. The top wall 16 and the bottom wall 11 are oppositely arranged along the second direction Z. One end of the third side wall 17 away from the top wall 16 is connected to the side surface of the bottom wall 11.

[0202] One end of the top wall 16 in the first direction X and one end of the two third side walls 17 in the first direction X form a first connection part 10g, and the other end of the top wall 16 in the first direction X and the other end of the two third side walls 17 in the first direction X form a second connection part 10h.

[0203] The bottom wall 11 is located between the two third side walls 17. The third side wall 17 has a third inner surface facing the bottom wall 11. The side surface of the bottom wall 11 in the third direction Y is the third side surface 111. The third side surface 111 and the third inner surface are stacked along the third direction Y, and the third side surface 111 and the third inner surface are hermetically connected.

[0204] For example, a third sealant is provided between the third side surface 111 and the third inner surface, and the third side surface 111 and the third inner surface are hermetically connected through the third sealant.

[0205] For another example, a third seal 83 is provided between the third side surface 111 and the third inner surface (please refer to Figure 2 ), the third side wall 17 and the bottom wall 11 are connected by a fifth locking member, and the third side surface 111 and the third inner surface are hermetically fitted through the third seal 83.

[0206] In the above solution, the side surface of the third side wall 17 and the bottom wall 11 are stacked along the third direction Y. By connecting one end of the third side wall 17 of the second box body 10d to the side surface of the bottom wall 11, the connection between the second box body 10d and the first box body 10c is realized. It can realize the connection between the second box body 10d and the first box body 10c without setting a flange structure protruding along the third direction Y, thereby improving the space utilization rate of the battery device 100 in the third direction Y to accommodate more battery cells or reducing the volume of the battery device 100, and further improving the energy density of the battery device 100.

[0207] In some embodiments, please refer to Figure 2 , the first seal 81, the second seal 82 and the third seal 83 are integrally formed.

[0208] Please refer to Figure 3 , according to some embodiments of the present application, a first flow channel 112 is formed inside the bottom wall 11, and the first flow channel 112 is used to accommodate a heat exchange medium; a second flow channel 24 is formed inside the bracket 20, and the second flow channel 24 is used to accommodate a heat exchange medium.

[0209] The bottom wall 11 can be integrally extruded and formed to form a first flow channel 112 inside the bottom wall 11.

[0210] The first flow channel 112 is a channel formed inside the bottom wall 11 and used as a flow channel for the heat exchange medium. After the battery device 100 is assembled, the first flow channel 112 can accommodate the heat exchange medium to facilitate heat exchange with the first battery cell assembly 50 through the bracket 20.

[0211] In some embodiments, the bottom wall 11 can have good heat conduction performance to facilitate heat exchange between the heat exchange medium and the first battery cell assembly 50 through the bottom wall 11. For example, when the heat exchange medium is a cooling medium, the low temperature of the cooling medium is transferred to the first battery cell assembly 50 through the bottom wall 11, which can reduce the temperature of the first battery cell assembly 50. Also, for example, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the first battery cell assembly 50 through the bottom wall 11, which can increase the temperature of the first battery cell assembly 50.

[0212] The heat exchange medium in the first flow channel 112 of the bottom wall 11 can be a fluid, and the heat exchange medium can be but not limited to water, alcohol or other liquid mixtures.

[0213] The second flow channel 24 is a channel formed inside the bracket 20 and used for the flow of the heat exchange medium. After the battery device 100 is assembled, the second flow channel 24 can accommodate the heat exchange medium to facilitate heat exchange with the second battery cell assembly 60 through the bracket 20.

[0214] In some embodiments, the bracket 20 can have good heat conduction performance to facilitate heat exchange between the heat exchange medium and the second battery cell assembly 60 through the bracket 20. For example, when the heat exchange medium is a cooling medium, the low temperature of the cooling medium is transferred to the second battery cell assembly 60 through the bracket 20, which can reduce the temperature of the second battery cell assembly 60. Also, for example, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the second battery cell assembly 60 through the bracket 20, which can increase the temperature of the second battery cell assembly 60.

[0215] The heat exchange medium in the second flow channel 24 of the bracket 20 can be a fluid, and the heat exchange medium can be but not limited to water, alcohol or other liquid mixtures.

[0216] In some embodiments, the second flow channel 24 can be formed in the support wall 21.

[0217] In the above solution, by accommodating a heat exchange medium in the first flow channel 112, heat exchange can be performed on the first battery cell assembly 50 through the heat exchange medium in the first flow channel 112, so as to adjust the temperature of the first battery cell assembly 50, improve the charge and discharge cycle performance of the first battery cell assembly 50, and thus improve the reliability of the battery device 100; by accommodating a heat exchange medium in the second flow channel 24, heat exchange can be performed on the second battery cell assembly 60 through the heat exchange medium in the second flow channel 24, so as to adjust the temperature of the second battery cell assembly 60, improve the charge and discharge cycle performance of the second battery cell assembly 60, and thus improve the reliability of the battery device 100.

[0218] Please refer to Figure 2 and Figure 4 , according to some embodiments of the present application, the surface of the first battery cell 51 perpendicular to the first direction X is the surface with the largest area of the first battery cell 51.

[0219] In the above solution, during the charge and discharge cycle of the battery cell, the surface with the largest area in the battery cell expands to a relatively large extent; the surface of the first battery cell 51 perpendicular to the first direction X is the surface with the largest area of the first battery cell 51. Along the first direction X, the first battery cell assembly 50 is disposed between the first expansion beam 12 and the second expansion beam 13, so as to facilitate constraining the expansion deformation of the first battery cell assembly 50 through the first expansion beam 12 and the second expansion beam 13, thereby improving the reliability of the battery device 100.

[0220] In some embodiments, the surface of the second battery cell 61 perpendicular to the first direction X is the surface with the largest area of the second battery cell 61.

[0221] The surface of the second battery cell 61 perpendicular to the first direction X is the surface with the largest area of the second battery cell 61. Along the first direction X, the second battery cell assembly 60 is disposed between the third expansion beam 22 and the fourth expansion beam 23, so as to facilitate constraining the expansion deformation of the second battery cell assembly 60 through the third expansion beam 22 and the fourth expansion beam 23, thereby improving the reliability of the battery device 100.

[0222] According to some embodiments of the present application, the embodiments of the present application further provide an electrical device, which includes the battery device 100 provided in any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0223] According to some embodiments of the present application, please refer to Figures 2 to 7 , the embodiments of the present application provide a battery device 100, which includes a box body 10, a bracket 20, a first locking member 30, a second locking member 40, a first battery cell assembly 50, and a second battery cell assembly 60.

[0224] The box body 10 includes a first box body 10c and a second box body 10d. The first box body 10c and the second box body 10d are connected to each other and enclose an internal space. The first box body 10c includes a bottom wall 11, a first side wall 14, and a second side wall 15. The first side wall 14 and the second side wall 15 are oppositely arranged along the first direction X. The first side wall 14 and the second side wall 15 are respectively connected to the bottom wall 11. The first battery cell assembly 50 and the second battery cell assembly 60 are both arranged between the first side wall 14 and the second side wall 15, and the bottom wall 11 supports the first battery cell assembly 50. The second box body 10d includes a top wall 16 and two third side walls 17. The two third side walls 17 are oppositely arranged along the third direction Y. The top wall 16 is connected to the two third side walls 17. The top wall 16 and the bottom wall 11 are oppositely arranged along the second direction Z. One end of the third side wall 17 away from the top wall 16 is connected to the side surface of the bottom wall 11.

[0225] The bracket 20 is arranged inside the box body 10 and divides the internal space of the box body 10 into a first accommodation space 10a and a second accommodation space 10b on both sides of the bracket 20. The first accommodation space 10a and the second accommodation space 10b are arranged along the second direction Z.

[0226] The box body 10 further includes a first expansion beam 12 and a second expansion beam 13. The first expansion beam 12 and the second expansion beam 13 are arranged at intervals along the first direction X. The first expansion beam 12 and the second expansion beam 13 are respectively connected to the bottom wall 11. The first battery cell assembly 50 is located in the first accommodation space 10a and between the first expansion beam 12 and the second expansion beam 13. Along the second direction Z, the first expansion beam 12 and the second expansion beam 13 are located between the bottom wall 11 and the bracket 20.

[0227] The bracket 20 includes a support wall 21, a third expansion beam 22, and a fourth expansion beam 23. The support wall 21 is located between the first battery cell assembly 50 and the second battery cell assembly 60. The third expansion beam 22 and the fourth expansion beam 23 are oppositely arranged along the first direction X and are respectively connected to the support wall 21. The support wall 21 supports the second battery cell assembly 60. The second battery cell assembly 60 is arranged between the third expansion beam 22 and the fourth expansion beam 23. The first expansion beam 12, the bottom wall 11, the second expansion beam 13, the two third side walls 17, and the support wall 21 enclose the first accommodation space 10a; the third expansion beam 22, the fourth expansion beam 23, the support wall 21, the top wall 16, and the two third side walls 17 enclose the second accommodation space 10b.

[0228] The first expansion beam 12 is provided with a first mounting hole 121, and the second expansion beam 13 is provided with a second mounting hole 131; the bracket 20 is provided with a third mounting hole 221 corresponding to the first mounting hole 121 and a fourth mounting hole 231 corresponding to the second mounting hole 131. The first locking member 30 is arranged along the second direction Z, the first locking member 30 passes through the third mounting hole 221 and is connected to the first mounting hole 121. The second locking member 40 is arranged along the second direction Z, the second locking member 40 passes through the fourth mounting hole 231 and is connected to the second mounting hole 131.

[0229] The first expansion beam 12 includes a first body 122 and a first convex portion 123. The first convex portion 123 is formed on the side of the first body 122 facing away from the first battery cell assembly 50, and the first mounting hole 121 is arranged on the first convex portion 123; the third expansion beam 22 includes a second body 222 and a second convex portion 223. The second convex portion 223 is formed on the side of the second body 222 facing away from the second battery cell assembly 60, and the third mounting hole 221 penetrates through the second convex portion 223 along the second direction Z. The first convex portion 123 is formed on the side of the first body 122 facing away from the first battery cell assembly 50, and the first mounting hole 121 is arranged on the first convex portion 123, which can reduce the occupation of the connection position between the bracket 20 and the first expansion beam 12 on the side of the first expansion beam 12 facing the first battery cell assembly 50, improve the space utilization rate between the first expansion beam 12 and the second expansion beam 13, and enable the battery device 100 to have a higher energy density; the second convex portion 223 is formed on the side of the second body 222 facing away from the second battery cell assembly 60, and the third mounting hole 221 penetrates through the second convex portion 223 along the second direction Z, so that the third mounting hole 221 and the first mounting hole 121 are arranged corresponding to each other along the second direction Z. The first fastener can pass through the third mounting hole 221 along the second direction Z and be connected to the first mounting hole 121, which is convenient for operation, can reduce the risk of interference between the first fastener connecting the bracket 20 and the first expansion beam 12 and the second battery cell assembly 60 and the first battery cell assembly 50. Moreover, more active materials can be arranged in the first accommodation space 10a between the first expansion beam 12 and the second expansion beam 13, and more active materials can be arranged in the second accommodation space 10b between the third expansion beam 22 and the fourth expansion beam 23, so that the battery device 100 has a higher energy density.

[0230] The fourth expansion beam 23 has a first end face 23a facing away from the bottom wall 11 and a second end face 23b facing the bottom wall 11. Along the second direction Z, the fourth mounting hole 231 penetrates through the first end face 23a and the second end face 23b; along the second direction Z, the size of the second locking member 40 is larger than that of the fourth expansion beam 23. The fourth mounting hole 231 penetrates through the first end face 23a and the second end face 23b along the second direction Z, and the space inside the fourth expansion beam 23 can be utilized to reduce the space occupied by the fourth mounting hole 231 on both sides of the fourth expansion beam 23 along the first direction X, thereby improving the energy density of the battery device 100; the size of the second locking member 40 along the second direction Z is larger than that of the fourth expansion beam 23. After the second locking member 40 penetrates through the fourth expansion beam 23 along the second direction Z, it is connected to the second mounting hole 131 on the second expansion beam 13. The second locking member 40 and the fourth expansion beam 23 have a relatively large connection area, making the connection between the second locking member 40 and the fourth expansion beam 23 reliable and improving the connection reliability between the fourth expansion beam 23 and the second expansion beam 13.

[0231] Although the present application has been described with reference to the preferred embodiments, various improvements can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A box body, including a bottom wall, a first expansion beam and a second expansion beam, the first expansion beam and the second expansion beam are arranged at intervals along a first direction, and the first expansion beam and the second expansion beam are respectively connected to the bottom wall; A bracket, disposed inside the box body, and separating the internal space of the box body into a first accommodation space and a second accommodation space on both sides of the bracket, the first accommodation space and the second accommodation space are arranged along a second direction, and the second direction intersects with the first direction; A first locking member, arranged along the second direction, and the bracket is connected to the first expansion beam through the first locking member; A second locking member, arranged along the second direction, and the bracket is connected to the second expansion beam through the second locking member; A first battery cell assembly, including a plurality of first battery cells stacked along the first direction, the first battery cell assembly is disposed in the first accommodation space, the first battery cell assembly is disposed between the first expansion beam and the second expansion beam, and the bottom wall supports the first battery cell assembly; A second battery cell assembly, including a plurality of second battery cells stacked along the first direction, the second battery cell assembly is disposed in the second accommodation space, and the bracket supports the second battery cell assembly; The bracket includes a support wall, a third expansion beam and a fourth expansion beam, the support wall is located between the first battery cell assembly and the second battery cell assembly, the third expansion beam and the fourth expansion beam are arranged opposite to each other along the first direction and are respectively connected to the support wall, the support wall supports the second battery cell assembly, and the second battery cell assembly is disposed between the third expansion beam and the fourth expansion beam; The fourth expansion beam has a first end face facing away from the bottom wall and a second end face facing the bottom wall, along the second direction, the second locking member penetrates through the first end face and the second end face and is connected to the second expansion beam, and the size of the second locking member is larger than the size of the fourth expansion beam.

2. The battery device according to claim 1, wherein The first expansion beam is provided with a first mounting hole, and the second expansion beam is provided with a second mounting hole; The third expansion beam is provided with a third mounting hole corresponding to the first mounting hole, the first locking member passes through the third mounting hole and is connected to the first mounting hole, the fourth expansion beam is provided with a fourth mounting hole corresponding to the second mounting hole, along the second direction, the fourth mounting hole penetrates through the first end face and the second end face, and the second locking member passes through the fourth mounting hole and is connected to the second mounting hole.

3. The battery device according to claim 2, characterized in that, The first expansion beam includes a first body and a first convex portion, the first convex portion is formed on a side of the first body facing away from the first battery cell assembly, and the first mounting hole is disposed on the first convex portion; The third expansion beam includes a second body and a second convex portion, the second convex portion is formed on a side of the second body facing away from the second battery cell assembly, and the third mounting hole penetrates through the second convex portion along the second direction.

4. The battery device according to claim 3, characterized in that, There are a plurality of first protrusions, the plurality of first protrusions are spaced apart along the third direction, and each first protrusion is provided with at least one first mounting hole; and / or there are a plurality of second protrusions, the plurality of second protrusions are spaced apart along the third direction, and each second protrusion is provided with at least one third mounting hole; The third direction, the second direction and the first direction are perpendicular to each other.

5. The battery device according to claim 2, characterized in that, A plurality of cavities arranged along the second direction are formed inside the fourth expansion beam, two adjacent cavities are separated by a partition wall, and the fourth mounting hole passes through the partition wall.

6. The battery device according to claim 3, characterized in that, The box body further includes a first side wall and a second side wall arranged opposite to each other along the first direction, the first side wall and the second side wall are respectively connected to the bottom wall, the first expansion beam and the second expansion beam are arranged between the first side wall and the second side wall, and the first expansion beam is closer to the first side wall than the second expansion beam; Along the first direction, a distance between the first expansion beam and the first side wall is greater than a distance between the second expansion beam and the second side wall.

7. The battery device according to claim 1, characterized in that, The battery device further includes a first restraining member, two ends of which are respectively connected to the first expansion beam and the second expansion beam, and the first restraining member is connected to a side of the first battery cell facing away from the bottom wall; The battery device further includes a second restraining member, two ends of which are respectively connected to the third expansion beam and the fourth expansion beam, and the second restraining member is connected to a side of the second battery cell that is away from the support wall.

8. The battery device according to claim 1, characterized in that, The box body includes a first box body and a second box body, the first box body and the second box body are connected to each other and enclose the internal space; The first box body includes the bottom wall, a first side wall, and a second side wall. The first side wall and the second side wall are arranged opposite to each other along the first direction. The first side wall and the second side wall are respectively connected to the bottom wall. The first battery cell assembly and the second battery cell assembly are both arranged between the first side wall and the second side wall. A first opening and a second opening are respectively formed at two ends of the second box body along the first direction; The first side wall closes the first opening, and the second side wall closes the second opening.

9. The battery device according to claim 8, characterized in that, The first side wall has a first inner surface facing the first battery cell assembly, a first outer surface facing away from the first battery cell assembly, and a first side surface connecting the first inner surface and the first outer surface; the second side wall has a second inner surface facing the first battery cell assembly, a second outer surface facing away from the first battery cell assembly, and a second side surface connecting the second inner surface and the second outer surface; The second box body includes a first connecting part and a second connecting part, the first connecting part and the second connecting part are respectively located at the two ends of the second box body along the first direction, the first connecting part surrounds the first opening, the first connecting part is connected to the first side surface, the second connecting part surrounds the second opening, and the second connecting part is connected to the second side surface.

10. The battery device according to claim 9, characterized in that, The second box body includes a top wall and two third side walls, the two third side walls are arranged opposite to each other along a third direction, the top wall connects the two third side walls, and one end of the third side wall far from the top wall is connected to the side surface of the bottom wall.

11. The battery device according to claim 1, characterized in that, A first flow channel is formed inside the bottom wall, and the first flow channel is used to accommodate a heat exchange medium; A second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium.

12. The battery device according to any one of claims 1-11, characterized in that, The surface of the first battery cell perpendicular to the first direction is the surface with the largest area of the first battery cell.

13. An electrical device, characterized in that, It includes the battery device according to any one of claims 1-12, and the battery device is used to provide electric energy.

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