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 support, a first battery monomer assembly and a second battery monomer assembly, the support divides the internal space of the box body into a first accommodating space and a second accommodating space which are located on the two sides of the support, and the first accommodating space and the second accommodating space are arranged in the gravity direction; the first battery monomer assembly is arranged in the first accommodating space and is supported on the box body; the second battery monomer assembly is arranged in the second accommodating space and is supported on the bracket; each battery monomer assembly comprises a plurality of battery monomers, each battery monomer comprises a shell and an electrode terminal, the width and the height of the shell are both smaller than the length of the shell, the electrode terminal is arranged at at least one end of the shell in the length direction of the shell, the length direction of the shell is perpendicular to the gravity direction, the length of the shell is L, and L is larger than or equal to 300 mm and smaller than or equal to 2500 mm. 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 in particular, 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 implemented 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 battery monomer assembly, and a second battery monomer assembly; 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, and the first accommodation space and the second accommodation space are arranged along the gravity direction; the first battery monomer assembly is disposed in the first accommodation space and supported by the box body; the second battery monomer assembly is disposed in the second accommodation space and supported by the bracket; the first battery monomer assembly is connected to the bracket through a first thermal conductive adhesive, and the second battery monomer assembly is connected to the bracket through a second thermal conductive adhesive; each battery monomer assembly includes a plurality of battery monomers, each battery monomer includes a housing and an electrode terminal, the width and height of the housing are both smaller than the length of the housing, along the length direction of the housing, the electrode terminal is disposed at at least one end of the housing, the length direction of the housing is perpendicular to the gravity direction, and the length of the housing is L, satisfying 300 mm ≤ L ≤ 2500 mm.

[0007] For the battery device according to an embodiment of the present application, the first battery cell assembly and the second battery cell assembly are arranged along the gravity direction. The battery device can arrange more battery cells in the gravity direction, so that the battery device has a higher energy density. The first battery cell assembly is connected to the bracket through the first thermal conductive adhesive, and the second battery cell assembly is connected to the bracket through the second thermal conductive adhesive, so that the space utilization rate in the gravity direction inside the box body is relatively high, which is convenient for improving the energy density of the battery device. In each battery cell assembly, by setting the length of the outer shell of the battery cell to be greater than or equal to 300 mm, the battery device can arrange a smaller number of battery cells in the length direction of the outer shell, saving the space occupied by components such as the outer shell of the battery cell, improving the space utilization rate of the battery device in the length direction of the outer shell, and further improving the energy density of the battery device; by designing the length of the outer shell of the battery cell to be less than or equal to 2500 mm, it is convenient for processing and manufacturing and for the assembly of the battery cell and the box body.

[0008] According to some embodiments of the present application, 600 mm ≤ L ≤ 2500 mm.

[0009] By designing the length of the outer shell of the battery cell to be greater than or equal to 600 mm, the battery cell can be a blade battery with a relatively large length, further improving the space utilization rate in the length direction of the outer shell inside the box body. By designing the length of the outer shell of the battery cell to be less than or equal to 2500 mm, it is convenient for processing and manufacturing and for the assembly of the battery cell and the box body.

[0010] According to some embodiments of the present application, the length direction of the outer shell is parallel to the width direction of the battery device; a plurality of battery cells in each battery cell assembly are stacked along the length direction of the battery device; the width direction of the battery device, the length direction of the battery device, and the gravity direction are perpendicular to each other in pairs.

[0011] In the above solution, the length direction of the outer shell is parallel to the width direction of the battery device, which can improve the space utilization rate in the width direction of the battery device; a plurality of battery cells in each battery cell assembly are stacked along the length direction of the battery device, and more battery cells can be arranged in the length direction of the battery device, so that the battery device has a higher energy density.

[0012] According to some embodiments of the present application, the length of the outer shell is greater than half of the width of the battery device.

[0013] In the above solution, the length of the outer shell is greater than half of the width of the battery device, and only one battery cell is arranged in the width direction of the battery device, so that the space utilization rate in the width direction of the box body inside the battery device is relatively high, which is convenient for improving the energy density of the battery device.

[0014] According to some embodiments of the present application, the electrode terminals include a positive terminal and a negative terminal. The positive terminal and the negative terminal are disposed at the same end of the housing in the length direction of the housing; or, the electrode terminals include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively disposed at opposite ends of the housing in the length direction of the housing.

[0015] In the above solution, the positive terminal and the negative terminal are disposed at the end of the housing in the length direction of the housing, which can improve the space utilization rate inside the box body in the height direction and the width direction of the housing. For example, a plurality of battery cells in each battery cell assembly can be arranged along the width direction of the housing, and the height direction of the battery cell can be parallel to the direction of gravity, so that the battery device has a high energy density.

[0016] According to some embodiments of the present application, 300 mm ≤ L < 600 mm.

[0017] By designing the length of the housing to be greater than or equal to 300 mm and less than 600 mm, while enabling the battery device to have a smaller number of battery cells arranged in the length direction of the housing, saving the space occupied by components such as the housing of the battery cells, the length of the housing is smaller, and the assembly between each battery cell assembly and the box body in the length direction of the housing is more flexible, and it can be applicable to different internal spaces of the box body.

[0018] According to some embodiments of the present application, the heat-conducting glue in the length direction of the housing is parallel to the width direction of the battery device; each battery cell assembly includes two battery cell columns, and each battery cell column includes a plurality of battery cells stacked along the length direction of the battery device, and the two battery cell columns are arranged along the width direction of the battery device; the width direction of the battery device, the length direction of the battery device, and the direction of gravity are perpendicular to each other in pairs.

[0019] In the above solution, the length direction of the housing is parallel to the width direction of the battery device. Along the width direction of the battery device, each battery cell assembly is provided with two battery cell columns, so as to improve the space utilization rate inside the box body in the width direction of the battery device. At the same time, each battery cell column can be provided with a larger number of battery cells in the length direction of the battery device to utilize the space inside the box body in the length direction of the battery device, so that the battery device has a high energy density.

[0020] According to some embodiments of the present application, a separator is disposed between the two battery cell columns of the same battery cell assembly, and a first flow channel is formed inside the separator, and the first flow channel is used to accommodate a heat exchange medium.

[0021] By arranging a separator between two battery cell columns of the same battery cell assembly, and accommodating a heat exchange medium inside the separator, while separating the two battery cell columns, the two battery cell columns can share one heat management component, reducing the number of heat management components. The two battery cell columns exchange heat with the heat exchange medium in the separator respectively, so as to adjust the temperatures of the two battery cell columns, improve the charge and discharge cycle performance of each battery cell assembly, and thus improve the reliability of the battery device.

[0022] According to some embodiments of the present application, in the same battery cell assembly, the electrode terminals of the battery cells in one battery cell column are arranged back to back with the electrode terminals of the battery cells in the other battery cell column.

[0023] By arranging the electrode terminals of the battery cells in the two battery cell columns in the same battery cell assembly back to back, the risk of interference between the electrode terminals and other components can be reduced, and the battery cells can have a larger connection area with the separator, which is convenient for adjusting the temperature of the battery cells.

[0024] According to some embodiments of the present application, the length direction of the outer shell is parallel to the length direction of the battery device; each battery cell assembly includes a plurality of battery cell columns, each battery cell column includes a plurality of battery cells stacked along the width direction of the battery device, and the plurality of battery cell columns are arranged along the length direction of the battery device; the width direction of the battery device, the length direction of the battery device, and the gravity direction are perpendicular to each other in pairs.

[0025] By arranging the plurality of battery cell columns along the length direction of the battery device, each battery cell assembly is flexible in the length direction of the battery device, and the space utilization rate in the length direction of the battery device inside the box body is relatively high.

[0026] According to some embodiments of the present application, the height direction of the outer shell is parallel to the gravity direction, and the height of the outer shell is H, satisfying 112.5mm ≤ H ≤ 184mm.

[0027] By designing the height direction of the outer shell to be parallel to the gravity direction, the plurality of battery cells of each battery cell assembly are stacked along the width direction of the outer shell, making the structure of each battery cell assembly compact and occupying a smaller assembly space; by designing the height of the outer shell to be greater than or equal to 112.5mm, a relatively large amount of active material can be arranged in the height direction of the battery cells, and the battery cells have a relatively high energy density; by designing the height of the outer shell to be less than or equal to 184mm, the overall size of the battery device in the gravity direction is relatively small, reducing the space occupied by the battery device in the gravity direction.

[0028] According to some embodiments of the present application, 140mm ≤ H ≤ 170mm.

[0029] By designing the height of the outer casing to be greater than or equal to 140 mm, it is further enabled that more active materials can be arranged in the height direction of the outer casing for the battery cell, and the battery cell has a higher energy density; by designing the height of the outer casing to be less than or equal to 170 mm, it is further enabled that the overall size of the battery device in the gravity direction is smaller, reducing the space occupied by the battery device in the gravity direction.

[0030] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism, and along the length direction of the outer casing, the pressure relief mechanism is arranged at at least one end of the outer casing.

[0031] By arranging the pressure relief mechanism at at least one end of the outer casing along the length direction of the outer casing, it is possible to release the internal pressure of the battery cell by using the space in the length direction of the outer casing, without reserving pressure relief space in the height direction and the width direction of the outer casing, which is convenient for improving the space utilization rate in the height direction and the width direction of the interior of the box body.

[0032] According to some embodiments of the present application, a second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium.

[0033] By accommodating the heat exchange medium in the second flow channel of the bracket, it is possible to perform heat exchange on the battery cells of the second battery cell assembly through the heat exchange medium in the bracket, which is convenient for adjusting the temperature of the battery cells of the second battery cell assembly, and can improve the charge and discharge cycle performance of the second battery cell assembly and the reliability of the second battery cell assembly. Further, by connecting the first battery cell assembly to the bracket through the first thermal conductive adhesive, it is convenient for the battery cells of the first battery cell assembly to perform heat exchange with the heat exchange medium in the bracket, which is convenient for adjusting the temperature of the battery cells of the first battery cell assembly; by connecting the second battery cell assembly to the bracket through the second thermal conductive adhesive, it is convenient for the battery cells of the second battery cell assembly to perform heat exchange with the heat exchange medium in the bracket, which is convenient for adjusting the temperature of the battery cells of the second battery cell assembly, and the first battery cell assembly and the second battery cell assembly share the same thermal management component, which can save the number of thermal management components, reduce the manufacturing cost and space occupation.

[0034] According to some embodiments of the present application, the box body includes a bottom wall, and the first battery cell assembly is supported on the bottom wall; the battery device further includes a first expansion beam and a second expansion beam arranged at intervals along the length direction of the battery device, the first expansion beam and the second expansion beam are respectively connected to the bottom wall, and the first battery cell assembly is arranged between the first expansion beam and the second expansion beam; 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 at intervals along the length direction of the battery device 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.

[0035] By arranging the first battery cell assembly between the first expansion beam and the second expansion beam, the expansion deformation of the first battery cell assembly can be restricted by the first expansion beam and the second expansion beam, which is conducive to improving the reliability of the first battery cell assembly; by arranging the second battery cell assembly between the third expansion beam and the fourth expansion beam, the expansion deformation of the second battery cell assembly can be restricted by the third expansion beam and the fourth expansion beam, which is conducive to improving the reliability of the second battery cell assembly.

[0036] According to some embodiments of the present application, the battery device further includes a restraint member, the restraint member connects the third expansion beam and the fourth expansion beam, and the restraint member is connected to the side of the second battery cell assembly facing away from the first battery cell assembly.

[0037] By connecting the third expansion beam and the fourth expansion beam with the restraint member, the movement of the second battery cell assembly in the direction away from the first battery cell assembly can be restricted, and the anti-expansion deformation effect of the third expansion beam and the fourth expansion beam on the second battery cell assembly can be improved, further improving the reliability of the second battery cell assembly.

[0038] According to some embodiments of the present application, a second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium; a third flow channel is formed inside the bottom wall, and the third flow channel is used to accommodate a heat exchange medium; a fourth flow channel is formed inside the restraint member, and the fourth flow channel is used to accommodate a heat exchange medium.

[0039] By accommodating the heat exchange medium in the second flow channel, the temperature of both the second battery cell assembly and the first battery cell assembly can be adjusted, which is conducive to improving the charge and discharge cycle performance of the second battery cell assembly and the first battery cell assembly, and improving the reliability of the second battery cell assembly and the first battery cell assembly; by accommodating the heat exchange medium in the third flow channel, the temperature of the first battery cell assembly can be adjusted, which is conducive to improving the charge and discharge cycle performance of the first battery cell assembly and improving the reliability of the first battery cell assembly; by accommodating the heat exchange medium in the fourth flow channel, the temperature of the second battery cell assembly can be adjusted, which is conducive to improving the charge and discharge cycle performance of the second battery cell assembly and improving the reliability of the second battery cell assembly.

[0040] According to some embodiments of the present application, the restraint member is in a plate-like structure, and in the same projection plane perpendicular to the direction of gravity, the orthographic projection of the second battery cell assembly falls within the orthographic projection of the restraint member.

[0041] By designing the restraint member in a floor-like structure and ensuring that the orthographic projection of the second battery cell assembly falls within the orthographic projection of the restraint member, the capacity of the fourth flow channel can be designed to be relatively large, allowing more heat exchange medium to be arranged inside the restraint member, facilitating the adjustment of the temperature of the second battery cell assembly, improving the charge and discharge cycle performance of the second battery cell assembly, and enhancing the reliability of the second battery cell assembly.

[0042] According to some embodiments of the present application, the number of restraint members is multiple, and the multiple restraint members are arranged at intervals along the width direction of the battery device.

[0043] By arranging the multiple restraint members at intervals along the width direction of the battery device, constraints can be provided to the second battery cell assembly at multiple positions in the width direction of the battery device, further restricting the movement of the second battery cell assembly in the direction away from the first battery cell assembly.

[0044] In a second aspect, an electrical device provided by an embodiment of the present application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0045] According to some embodiments of the present application, the electrical device is a vehicle, the vehicle includes a vehicle frame, the vehicle frame includes a cross beam and two longitudinal beams, the two longitudinal beams are arranged at intervals along the width direction of the battery device, the cross beam connects the two longitudinal beams, the battery device is connected to the vehicle frame, and the length direction of the longitudinal beam is parallel to the length direction of the battery device; the width direction of the battery device, the length direction of the battery device, and the gravity direction are perpendicular to each other in pairs.

[0046] By connecting the battery device to the vehicle frame and making the length direction of the longitudinal beam parallel to the length direction of the battery device, the battery device can utilize the space in the length direction of the longitudinal beam to arrange more active substances in the length direction of the longitudinal beam, enabling the battery device to have a higher energy density.

[0047] The above description is only an overview of the technical solutions of the present application. In order 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

[0048] In order to illustrate the technical solutions of the embodiments of the present application more clearly, the drawings required for use 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.

[0049] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0050] Figure 2 Exploded view of the structure of the battery device provided for some embodiments of the present application;

[0051] Figure 3 Cross-sectional view of a partial structure of the battery device provided for some embodiments of the present application;

[0052] Figure 4 Stereogram of the battery cell assembly provided for some embodiments of the present application;

[0053] Figure 5 Structure diagram of the battery cell provided for some embodiments of the present application;

[0054] Figure 6 Cross-sectional view of the battery device provided for some embodiments of the present application;

[0055] Figure 7 Structure diagram of the battery cell provided for some other embodiments of the present application;

[0056] Figure 8 Structure diagram of the battery cell assembly provided for some embodiments of the present application;

[0057] Figure 9 Cross-sectional view of a partial structure of the battery cell assembly provided for some embodiments of the present application;

[0058] Figure 10 Structure diagram of the battery cell assembly provided for some other embodiments of the present application;

[0059] Figure 11 Stereogram of the battery cell provided for some embodiments of the present application;

[0060] Figure 12 Cross-sectional view of the battery device provided for some other embodiments of the present application;

[0061] Figure 13 Cross-sectional view of a partial structure of the battery device provided for some other embodiments of the present application;

[0062] Figure 14 Assembly diagram of the vehicle frame and the battery device provided for some embodiments of the present application;

[0063] Figure 15 Cross-sectional view of the vehicle frame and the battery device in the assembled state provided for some embodiments of the present application.

[0064] Icons: 1000 - Vehicle; 100 - Battery device; 200 - Controller; 300 - Motor; 10 - Housing; 10a - First sub - housing; 10b - Second sub - housing; 11 - Bottom wall; 11a - Third flow channel; 20 - Bracket; 20a - Second flow channel; 21 - Support wall; 22 - Third expansion beam; 23 - Fourth expansion beam; 30 - Battery cell assembly; 30a - First battery cell assembly; 30b - Second battery cell assembly; 30c - Battery cell row; 3 - Battery cell; 31 - Outer casing; 311 - Housing body; 312 - End cover; 32 - Electrode terminal; 32a - Positive terminal; 32b - Negative terminal; 33 - Pressure relief mechanism; 40 - Separator; 40a - First flow channel; 51 - First thermal conductive adhesive; 52 - Second thermal conductive adhesive; 53 - Third thermal conductive adhesive; 54 - Fourth thermal conductive adhesive; 61 - First expansion beam; 62 - Second expansion beam; 71 - First fastener; 72 - Second fastener; 80 - Restraint; 80a - Fourth flow channel; 400 - Frame; 410 - Cross beam; 420 - Longitudinal beam; Q1 - First accommodation space; Q2 - Second accommodation space; U - Length direction of the battery device; V - Width direction of the battery device; X - Length direction of the outer casing; G - Direction of gravity. Detailed implementation manners

[0065] The following further describes the implementation manners of the present application in detail with reference to the 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.

[0066] 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 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 and claims of the present application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0067] The terms "first", "second", etc. in the description and claims of the present application or the above - mentioned drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0068] Referring to the "embodiment" in the present application means that the specific features, structures or characteristics described in combination with the embodiment 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.

[0069] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", and "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 a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. 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 circumstances.

[0070] In the present application, the term "and / or" is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the present application, the character " / " generally represents an "or" relationship between the front and back associated objects.

[0071] In the present application, "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0072] 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.

[0073] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0074] In some embodiments, the battery device can 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.

[0075] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0076] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0077] As an example, the box body may include a first sub-box body and a second sub-box body. The first sub-box body and the second sub-box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first sub-box body can be a top cover or a bottom plate.

[0078] As an example, the housing 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 housing to accommodate the battery cell assembly.

[0079] As an example, the housing can be part of the chassis structure of a vehicle. For example, the top cover of the housing can become at least part of the floor of the vehicle, or the frame of the housing can become at least part of the cross beam and longitudinal beam of the vehicle.

[0080] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0081] The battery cell can 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.

[0082] The 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 embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing the short circuit between the positive and negative electrodes, and at the same time can allow the active ions to pass through.

[0083] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0084] 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.

[0085] As an example, the positive electrode current collector can 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 can include a polymer material base layer 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.).

[0086] As an example, the positive electrode active material can 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.

[0087] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0088] 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 a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. may be used.

[0089] 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.

[0090] As an example, the negative electrode active material may be a negative electrode active material for a battery well-known in the art. As an example, the negative electrode active material may 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 material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, 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 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0091] 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 may be selected.

[0092] As an example, the main material of the separator membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane may 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 may be the same or different, without particular limitation. The separator may be a single component located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

[0093] 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.

[0094] 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.

[0095] In some embodiments, the electrode assembly is a stacked structure.

[0096] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as an electrode assembly and an 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.

[0097] 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 substances such as an electrode assembly and an electrolyte. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0098] In some embodiments, at least one electrode terminal is provided on the housing, 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 body.

[0099] In some embodiments, a pressure relief valve is provided on the housing. The pressure relief valve is used to release the internal pressure of the battery cell.

[0100] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can play a role in protecting the electrode assembly and preventing, for example, electrolyte leakage. When the housing is a non-sealed structure, the housing can play a role in protecting the electrode assembly. A sealing bag may further be included between the housing and the electrode assembly, and the sealing bag is used to encapsulate components such as an electrode assembly and an electrolyte. Specifically, the sealing bag can be a bag-shaped insulating part or an aluminum-plastic film.

[0101] The development of battery device technology needs to consider multiple 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.

[0102] In some embodiments, a battery device is provided with a plurality of battery cells. The length of the housing of the battery cell is small. Therefore, more battery cells are arranged in the length direction of the housing. When the number of battery cells is large, due to factors such as the wall thickness of the housing, the space utilization rate of the battery device in the length direction of the housing is low, resulting in a low energy density of the battery device. Although some battery devices arrange multiple layers of battery cell assemblies in the gravity direction, the energy density of the battery device is still low under the condition of the same internal space of the box body.

[0103] In view of this, to solve the problem that the internal space utilization rate of the battery device is low, 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 battery cell assembly and a second battery cell assembly; the bracket is arranged inside the box body, dividing the internal space of the box body into a first accommodation space and a second accommodation space on both sides of the bracket, and the first accommodation space and the second accommodation space are arranged along the gravity direction; the first battery cell assembly is arranged in the first accommodation space and supported by the box body; the second battery cell assembly is arranged in the second accommodation space and supported by the bracket; the first battery cell assembly is connected to the bracket through a first heat-conducting adhesive, and the second battery cell assembly is connected to the bracket through a second heat-conducting adhesive; each battery cell assembly includes a plurality of battery cells, each battery cell includes a housing and electrode terminals, the width and height of the housing are both smaller than the length of the housing, along the length direction of the housing, the electrode terminals are arranged at at least one end of the housing, the length direction of the housing is perpendicular to the gravity direction, and the length of the housing is L, satisfying 300mm ≤ L ≤ 2500mm.

[0104] According to the battery device of the embodiment of the present application, the first battery cell assembly and the second battery cell assembly are arranged along the gravity direction, and the battery device can arrange more battery cells in the gravity direction, so that the battery device has a higher energy density. The first battery cell assembly is connected to the bracket through a first heat-conducting adhesive, and the second battery cell assembly is connected to the bracket through a second heat-conducting adhesive, so that the space utilization rate in the gravity direction inside the box body is high, which is convenient for improving the energy density of the battery device. In each battery cell assembly, by setting the length of the housing of the battery cell to be greater than or equal to 300mm, the battery device can arrange a smaller number of battery cells in the length direction of the housing, saving the space occupied by components such as the housing of the battery cell, improving the space utilization rate of the battery device in the length direction of the housing, and further improving the energy density of the battery device; by designing the length of the housing of the battery cell to be less than or equal to 2500mm, it is convenient for processing and manufacturing and for assembling the battery cell with the box body.

[0105] The battery device disclosed in the embodiment 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 system of the power-consuming device can be composed of the battery device disclosed in the present application.

[0106] The power-consuming device can include mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles and spaceships, etc.

[0107] For the convenience of description in the following embodiments, a power-consuming device in an embodiment of the present application is taken as an example of a vehicle for description.

[0108] Please refer to Figure 1 ,Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as the working power requirements for starting, navigating, and running the vehicle 1000.

[0109] 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 requirements for starting, navigating, and driving the vehicle 1000.

[0110] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0111] Please refer to Figures 2 to 5 , Figure 2 Schematic exploded view of the structure of a battery device provided by some embodiments of the present application, Figure 3 Cross-sectional view of a partial structure of a battery device provided by some embodiments of the present application, Figure 4 Stereogram of a battery cell assembly provided by some embodiments of the present application, Figure 5 Schematic structural diagram of a battery cell provided by some embodiments of the present application. Some embodiments of the present application provide a battery device 100, which includes a box body 10, a bracket 20, a first battery cell assembly 30a, and a second battery cell assembly 30b. The bracket 20 is disposed inside the box body 10, dividing the internal space of the box body 10 into a first accommodation space Q1 and a second accommodation space Q2 on both sides of the bracket 20. The first accommodation space Q1 and the second accommodation space Q2 are arranged along the gravity direction G. The first battery cell assembly 30a is disposed in the first accommodation space Q1 and supported by the box body 10; the second battery cell assembly 30b is disposed in the second accommodation space Q2 and supported by the bracket 20; the first battery cell assembly 30a and the bracket 20 are connected by a first thermal conductive adhesive 51 (please refer to Figure 12), Connection: The second battery cell assembly 30b is connected to the bracket 20 by a second thermal conductive adhesive 52. Each battery cell assembly 30 includes a plurality of battery cells 3. Each battery cell 3 includes a housing 31 and electrode terminals 32. The width and height of the housing 31 are both smaller than the length of the housing 31. Along the length direction X of the housing, the electrode terminals 32 are disposed at at least one end of the housing 31. The length direction X of the housing is perpendicular to the gravity direction G. The length of the housing 31 is L, and 300 mm ≤ L ≤ 2500 mm is satisfied.

[0112] The box body 10 is used to provide a receiving space for the first battery cell assembly 30a and the second battery cell assembly 30b.

[0113] In some embodiments, the box body 10 may include a first sub-box body 10a and a second sub-box body 10b. The first sub-box body 10a and the second sub-box body 10b cover each other. The first sub-box body 10a and the second sub-box body 10b jointly define a receiving space for accommodating the battery cells 3. The second sub-box body 10b may be a hollow structure with one end open. The first sub-box body 10a may be a plate-like structure. The first sub-box body 10a covers the open side of the second sub-box body 10b so that the first sub-box body 10a and the second sub-box body 10b jointly define a receiving space; the first sub-box body 10a and the second sub-box body 10b may also both be hollow structures with one side open, and the open side of the first sub-box body 10a covers the open side of the second sub-box body 10b.

[0114] The bracket 20 cooperates with the box body 10 to divide the internal space of the box body 10 into a first receiving space Q1 and a second receiving space Q2. The thickness direction of the bracket 20 is parallel to the gravity direction G. The first receiving space Q1 and the second receiving space Q2 are arranged along the gravity direction G. The first receiving space Q1 is used to accommodate the first battery cell assembly 30a, and the second receiving space Q2 is used to accommodate the second battery cell assembly 30b.

[0115] In some embodiments, along the gravity direction G, the orthographic projection of the first battery cell assembly 30a completely overlaps with the orthographic projection of the second battery cell assembly 30b. For example, the first battery cell assembly 30a and the second battery cell assembly 30b may have the same structure to facilitate processing and manufacturing.

[0116] The first battery cell assembly 30a is supported by the box body 10. For example, the first battery cell assembly 30a is supported by the wall body of the box body 10 that encloses the first receiving space Q1.

[0117] The second battery cell assembly 30b is supported by the bracket 20. For example, the second battery cell assembly 30b is supported by the part of the bracket 20 that encloses the second receiving space Q2.

[0118] In some embodiments, the second battery cell assembly 30b can be integrated into the bracket 20. For example, during the assembly process of the battery device 100, the assembly of the first battery cell assembly 30a and the box body 10, and the assembly of the second battery cell assembly 30b and the bracket 20 can be carried out synchronously, and then the bracket 20 integrated with the second battery cell assembly 30b is installed into the box body 10 to save the assembly time and improve the assembly efficiency.

[0119] Both the first thermal conductive adhesive 51 and the second thermal conductive adhesive 52 are materials with bonding properties and thermal conductive properties.

[0120] Among them, the material of each thermal conductive adhesive can include an organic polymer matrix and a thermal conductive filler, and the thermal conductive filler is compounded with the organic polymer matrix to form the first thermal conductive adhesive 51. The organic polymer matrix can include at least one of silicone resin and acrylic resin. The thermal conductive filler can include at least one of ceramic particles and metal oxides.

[0121] In each battery cell assembly 30, multiple battery cells 3 can be connected in series, parallel or in a mixed connection. The mixed connection means that there are both series and parallel connections among multiple battery cells 3.

[0122] The battery device 100 can also include a busbar component for realizing the electrical connection among multiple battery cells 3.

[0123] It should be noted that the battery device 100 can be provided with only the first battery cell assembly 30a and the second battery cell assembly 30b, or the battery device 100 can also be provided with other battery cell assemblies 30 in addition to the first battery cell assembly 30a and the second battery cell assembly 30b.

[0124] Each battery cell assembly 30 mentioned in this application refers to any one battery cell assembly 30 in the battery device 100.

[0125] In some embodiments, the outer shell 31 includes a shell body 311 and an end cover 312. The shell body 311 has an opening, and the end cover 312 closes the opening to isolate the internal environment of the battery cell 3 from the external environment.

[0126] The shell body 311 is a component for cooperating with the end cover 312 to form the internal environment of the battery cell 3. Among them, the formed internal environment can be used to accommodate the electrode assembly, the electrolyte and other components. The shell body 311 and the end cover 312 can be independent components. The shell body 311 can be of various shapes and various sizes. Specifically, the shape of the shell body 311 can be determined according to the specific shape and size of the electrode assembly. The material of the shell body 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0127] The end cap 312 refers to a component that covers the opening of the housing 311 to isolate the internal environment of the battery cell 3 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the housing 311 to fit the housing 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 312 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 3 to have higher structural strength and improved reliability. Functional components such as electrode terminals 32 and pressure relief mechanisms can be provided on the end cap 312. The electrode terminals 32 can be used for electrical connection with the electrode assembly to output or input the electrical energy of the battery cell 3. The pressure relief mechanism is used to release the pressure inside the battery cell 3. The material of the end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 312, and the insulating structure can be used to isolate the electrical connection components inside the housing 311 from the end cap 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0128] The battery cell 3 further includes an electrode assembly, which is a component in the battery cell 3 where an electrochemical reaction occurs. One or more electrode assemblies can be included in the housing 311. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and usually an isolation film is provided between the positive electrode plate and the negative electrode plate. The isolation film is used to separate the positive electrode plate and the negative electrode plate to prevent internal short circuit between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active substances constitute the main body of the electrode assembly, and the parts of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively.

[0129] In some embodiments, the width of the outer shell 31 can be less than the height of the outer shell 31 so that more active substances can be provided in the height direction of the battery cell 3 in the outer shell 31.

[0130] The length direction X of the outer shell, the width direction of the outer shell 31, and the height direction of the outer shell 31 are perpendicular to each other in pairs, and the length of the outer shell 31 is greater than the width of the outer shell 31 and greater than the height of the outer shell 31.

[0131] In some embodiments, the electrode terminals 32 can be provided at one end of the outer shell 31 along the length direction X of the outer shell. In other embodiments, the electrode terminals 32 can include a positive electrode terminal and a negative electrode terminal. The positive electrode terminal and the negative electrode terminal can be provided at one end of the outer shell 31 along the length direction X of the outer shell, or the positive electrode terminal and the negative electrode terminal can be respectively provided at opposite ends of the outer shell 31 along the length direction X of the outer shell.

[0132] In some embodiments, the height direction of the battery device 100 may be parallel to the gravity direction G. That is, the length direction U and the width direction V of the battery device are perpendicular to the gravity direction G respectively. The length direction X of the housing is perpendicular to the gravity direction G, and the length direction X of the housing may be parallel to the length direction U of the battery device, or the length direction X of the housing may be parallel to the width direction V of the battery device.

[0133] If the length of the housing 31 of the battery cell 3 is too small, when multiple battery cells 3 are arranged in the length direction X of the housing, due to the influence of the thickness of the wall portion of the housing 31, with the same dimensions of the housing 31 in other directions, the active material arranged in the length direction X of the housing 31 of the battery cell assembly 30 is less, resulting in a lower energy density.

[0134] If the length of the housing 31 of the battery cell 3 is too large, the processing and manufacturing difficulty is greater, and the internal space of the box body 10 is insufficient, which is not conducive to the assembly of the battery cell 3 and the box body 10.

[0135] In some embodiments, the length L of the housing 31 may be, but is not limited to, any one of 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 1000mm, 1050mm, 1100mm, 1200mm, 1300mm, 1400mm, 1500mm, 1600mm, 1700mm, 1800mm, 1900mm, 2000mm, 2100mm, 2200mm, 2300mm, 2400mm or 2500mm, or the range between any two of them.

[0136] In some embodiments, the length of the housing 31 can be measured by a measuring tool, and the measuring tool may include a tape measure, a laser rangefinder, etc. When measuring the length of the housing 31, the distance between the two end faces of the housing 31 in the length direction of the housing 31 can be measured by the measuring tool. The length of the housing 31 can be measured at different positions, and the average value of multiple measurement results can be calculated.

[0137] According to the battery device 100 of the embodiment of the present application, the first battery cell assembly 30a and the second battery cell assembly 30b are arranged along the gravity direction G. The battery device 100 can arrange more battery cells 3 in the gravity direction G, so that the battery device 100 has a higher energy density. The first battery cell assembly 30a is connected to the bracket 20 through the first thermal conductive adhesive 51, and the second battery cell assembly 30b is connected to the bracket 20 through the second thermal conductive adhesive 52, so that the space utilization rate inside the box body 10 in the gravity direction G is relatively high, which is convenient for improving the energy density of the battery device 100. In each battery cell assembly 30, by setting the length of the outer shell 31 of the battery cell 3 to be greater than or equal to 300 mm, the battery device 100 can arrange a smaller number of battery cells 3 in the length direction X of the outer shell, saving the space occupied by components such as the outer shell 31 of the battery cell 3, improving the space utilization rate of the battery device 100 in the length direction X of the outer shell, and further improving the energy density of the battery device 100; by designing the length of the outer shell 31 of the battery cell 3 to be less than or equal to 2500 mm, it is convenient for processing and manufacturing and for the assembly of the battery cell 3 and the box body 10.

[0138] According to some embodiments of the present application, 600 mm ≤ L ≤ 2500 mm.

[0139] For example, L can be, but is not limited to, any one or the range between any two of 600 mm, 620 mm, 640 mm, 660 mm, 680 mm, 700 mm, 720 mm, 740 mm, 760 mm, 780 mm, 800 mm, 820 mm, 850 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, 1100 mm, 1150 mm, 1200 mm, 1250 mm, 1350 mm, 1450 mm, 1550 mm, 1650 mm, 1750 mm, 1850 mm, 1950 mm, 2050 mm, 2150 mm, 2250 mm, 2350 mm, 2450 mm or 2500 mm.

[0140] By designing the length of the outer shell 31 of the battery cell 3 to be greater than or equal to 600 mm, the battery cell 3 can be a blade battery with a relatively large length, further improving the space utilization rate inside the box body 10 in the length direction X of the outer shell. By designing the length of the outer shell 31 of the battery cell 3 to be less than or equal to 2500 mm, it is convenient for processing and manufacturing and for the assembly of the battery cell 3 and the box body 10.

[0141] Please refer to Figure 2 and further refer to Figure 6 Figure 6 ​A cross-sectional view of a battery device provided by some embodiments of the present application. According to some embodiments of the present application, the length direction X of the housing is parallel to the width direction V of the battery device; a plurality of battery cells 3 in each battery cell assembly 30 are stacked along the length direction U of the battery device; the width direction V of the battery device, the length direction U of the battery device, and the gravity direction G are perpendicular to each other in pairs.

[0142] In some embodiments, the width direction of the housing 31 may be parallel to the length direction U of the battery device.

[0143] The length direction X of the housing is parallel to the width direction V of the battery device. In the width direction V of the battery device, each battery cell assembly 30 may be provided with a smaller number of battery cells 3, and each battery cell assembly 30 may be provided with more active materials in the width direction V of the battery device, improving the space utilization rate of the battery cell assembly 30 in the width direction V of the battery device, so that the battery cell assembly 30 has a higher energy density.

[0144] In each battery cell assembly 30, a plurality of battery cells 3 are stacked along the length direction U of the battery device, so that the battery cell assembly 30 can be provided with a larger number of battery cells 3 in the length direction U of the battery device, the battery cell assembly 30 has a higher capacity, and the battery cell assembly 30 has a higher energy density.

[0145] Please refer to Figure 6 , according to some embodiments of the present application, the length of the housing 31 is greater than half of the width of the battery device 100.

[0146] The length of the housing 31 is greater than half of the width of the battery device 100. When the battery cell assembly 30 is assembled with the box body 10, the length direction X of the housing is parallel to the width direction of the battery cell 3. Only one battery cell 3 can be arranged in the box body 10 in the width direction V of the battery device. The length of the appropriate housing 31 can be selected according to the space in the box body 10 in the width direction V of the battery device.

[0147] The length direction X of the housing is parallel to the width direction of the battery cell 3. The length of the housing 31 is greater than half of the width of the battery device 100. Only one battery cell 3 is arranged in the width direction V of the battery device, so that the space utilization rate in the width direction of the battery device 100 inside the box body 10 is relatively high, which is convenient for improving the energy density of the battery device 100.

[0148] Please refer to Figure 5 and further refer to Figure 7 , Figure 7 A structural schematic diagram of a battery cell provided by other embodiments of the present application. According to some embodiments of the present application, as Figure 7As shown, the electrode terminal 32 includes a positive terminal 32a and a negative terminal 32b, and the positive terminal 32a and the negative terminal 32b are provided at the same end of the housing 31 in the length direction X of the housing; or, as Figure 5 shown, the electrode terminal 32 includes a positive terminal 32a and a negative terminal 32b, and the positive terminal 32a and the negative terminal 32b are respectively provided at opposite ends of the housing 31 in the length direction X of the housing.

[0149] The positive terminal 32a and the negative terminal 32b are provided at the same end of the housing 31 in the length direction X of the housing. For example, the housing 31 includes a housing body 311 and an end cover 312. An opening is formed at one end of the housing body 311 in the length direction X of the housing, and the end cover 312 closes the opening. The positive terminal 32a and the negative terminal 32b can be provided on the end cover 312.

[0150] The positive terminal 32a and the negative terminal 32b are respectively provided at opposite ends of the housing 31 in the length direction X of the housing. For example, the housing 31 includes a housing body 311 and two end covers 312. Openings are respectively formed at opposite ends of the housing body 311 in the length direction X of the housing, and the two end covers 312 close the two openings. The positive terminal 32a is provided on one end cover 312, and the negative terminal 32b is provided on the other end cover 312.

[0151] In the above solution, the positive terminal 32a and the negative terminal 32b are provided at the ends of the housing 31 in the length direction X of the housing, which can improve the space utilization rate inside the box body 10 in the height direction and the width direction of the housing 31. For example, multiple battery cells 3 in each battery cell assembly 30 can be arranged along the width direction of the housing 31, and the height direction of the battery cell 3 can be parallel to the gravity direction G, so that the battery device 100 has a high energy density.

[0152] According to some embodiments of the present application, 300 mm ≤ L < 600 mm.

[0153] For example, L can be, but is not limited to, any one of 300 mm, 320 mm, 340 mm, 360 mm, 380 mm, 400 mm, 420 mm, 440 mm, 460 mm, 480 mm, 500 mm, 520 mm, 540 mm, 560 mm, 580 mm, 590 mm, 595 mm or the range between any two of them.

[0154] By designing the length of the outer shell 31 to be greater than or equal to 300 mm and less than 600 mm, while enabling the battery device 100 to have a smaller number of battery cells 3 arranged in the length direction X of the outer shell, saving the space occupied by components such as the outer shell 31 of the battery cell 3, the length of the outer shell 31 is smaller, and the assembly of each battery cell assembly 30 with the box body 10 in the length direction X of the outer shell is more flexible, and it can be applicable to the internal space of different box bodies 10.

[0155] Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of a battery cell assembly provided in some embodiments of the present application. According to some embodiments of the present application, the length direction X of the outer shell is parallel to the width direction V of the battery device; each battery cell assembly 30 includes two battery cell columns 30c, and each battery cell column 30c includes a plurality of battery cells 3 stacked along the length direction U of the battery device, and the two battery cell columns 30c are arranged along the width direction V of the battery device; the width direction V of the battery device, the length direction U of the battery device, and the gravity direction G are perpendicular to each other in pairs.

[0156] The length direction X of the outer shell is parallel to the width direction V of the battery device, and the width direction of the outer shell 31 can be parallel to the length direction U of the battery device 100.

[0157] In each battery cell assembly 30, the two battery cell columns 30c are arranged along the width direction V of the battery device. For example, a separator is provided between the two battery cell columns 30c along the width direction V of the battery device, or no separator is provided between the two battery cell columns 30c along the width direction V of the battery device.

[0158] In the above solution, the length direction X of the outer shell is parallel to the width direction V of the battery device. Along the width direction V of the battery device, each battery cell assembly 30 is provided with two battery cell columns 30c to facilitate improving the space utilization rate inside the box body 10 in the width direction V of the battery device. At the same time, each battery cell column 30c can be provided with a relatively large number of battery cells 3 in the length direction U of the battery device to utilize the space inside the box body 10 in the length direction U of the battery device, so that the battery device 100 has a relatively high energy density.

[0159] Please refer to Figure 8 and further refer to Figure 9 , Figure 9 which is a cross-sectional view of a partial structure of a battery cell assembly provided in some embodiments of the present application. According to some embodiments of the present application, a separator 40 is provided between the two battery cell columns 30c of the same battery cell assembly 30, and a first flow channel 40a is formed inside the separator 40, and the first flow channel 40a is used to accommodate a heat exchange medium.

[0160] The separator 40 is used to separate two battery cell columns 30c of the same battery cell assembly 30, and can reduce the temperature influence between the two battery cell columns 30c.

[0161] In some embodiments, the separator 40 can be integrally extruded from a base material to form a first flow channel 40a inside the separator 40. After the integrally extruded structure of the base material, the openings at both ends of the extrusion structure are closed to reduce the risk of heat exchange medium leakage.

[0162] In some embodiments, a pipeline for conveying the heat exchange medium can be provided on the separator 40, and the pipeline can be connected to the heat exchange system of a cold source or an electrical device, so as to facilitate the conveyance of the heat exchange medium to the first flow channel 40a of the separator 40.

[0163] After the battery device 100 is assembled, the first flow channel 40a can accommodate the heat exchange medium, so that the separator 40 constitutes a thermal management component, facilitating the adjustment of the temperatures of the two battery cell columns 30c.

[0164] The separator 40 can have good heat conduction performance, so as to facilitate the heat exchange between the battery cell column 30c and the heat exchange medium inside the separator 40. For example, when the heat exchange medium is a cooling medium, the low temperature of the heat exchange medium is transferred to the battery cell column 30c through the separator 40, which can reduce the temperature of the battery cell 3. Also for example, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the battery cell column 30c through the separator 40, which can increase the temperature of the battery cell 3.

[0165] In some embodiments, the heat exchange medium can be a fluid, and the heat exchange medium can include but is not limited to water, alcohol or other liquid mixtures.

[0166] By providing the separator 40 between two battery cell columns 30c of the same battery cell assembly 30, and the separator 40 internally accommodates the heat exchange medium, while separating the two battery cell columns 30c, the two battery cell columns 30c can share one thermal management component, reducing the number of thermal management components. The two battery cell columns 30c respectively exchange heat with the heat exchange medium inside the separator 40, so as to facilitate the adjustment of the temperatures of the two battery cell columns 30c, improve the charge and discharge cycle performance of each battery cell assembly 30, and thus improve the reliability of the battery device 100.

[0167] Please refer to Figure 9 , according to some embodiments of the present application, in the same battery cell assembly 30, the electrode terminals 32 of the battery cells 3 in one battery cell column 30c are arranged back to back with the electrode terminals 32 of the battery cells 3 in another battery cell column 30c.

[0168] In the same battery cell assembly 30, the electrode terminals 32 of each battery cell 3 are disposed at the same end of the housing 31 in the longitudinal direction X of the housing, so that in the width direction V of the battery device, the electrode terminals 32 of the battery cells 3 in the two battery cell rows 30c are disposed back to back.

[0169] By disposing the electrode terminals 32 of the battery cells 3 in the two battery cell rows 30c in the same battery cell assembly 30 back to back, the risk of interference between the electrode terminals 32 and other components can be reduced, and the battery cells 3 can have a relatively large connection area with the separator 40, which is convenient for adjusting the temperature of the battery cells 3.

[0170] Please refer to Figure 10 , Figure 10 which is a schematic structural view of a battery cell assembly provided in some other embodiments of the present application. According to some embodiments of the present application, the longitudinal direction X of the housing is parallel to the longitudinal direction U of the battery device; each battery cell assembly 30 includes a plurality of battery cell rows 30c, each battery cell row 30c includes a plurality of battery cells 3 stacked in the width direction V of the battery device, and the plurality of battery cell rows 30c are arranged in the longitudinal direction U of the battery device; the width direction V, the longitudinal direction U of the battery device, and the gravity direction G are perpendicular to each other in pairs.

[0171] The longitudinal direction X of the housing is parallel to the longitudinal direction U of the battery device, and the width direction of the housing 31 may be parallel to the width direction V of the battery device.

[0172] By arranging the plurality of battery cell rows 30c in the longitudinal direction U of the battery device, each battery cell assembly 30 is flexible in setting in the longitudinal direction U of the battery device, and the space utilization rate in the longitudinal direction U of the interior of the box body 10 is relatively high.

[0173] Please refer to Figure 5 , according to some embodiments of the present application, the height direction of the housing 31 is parallel to the gravity direction G, and the height of the housing 31 is H, satisfying 112.5 mm ≤ H ≤ 184 mm.

[0174] The height of the housing 31 is the distance between the outer surfaces of the two opposite wall bodies of the housing 31 in the height direction of the housing 31.

[0175] The height of the housing 31 can be measured by measuring tools such as a tape measure and a laser rangefinder.

[0176] For example, H can be, but is not limited to, any one of 112.5 mm, 120 mm, 125 mm, 130 mm, 135 mm, 140 mm, 145 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 175 mm, 180 mm or 184 mm, or a range between any two of them.

[0177] By designing the height direction of the outer shell 31 to be parallel to the gravity direction G, a plurality of battery cells 3 of each battery cell assembly 30 are stacked along the width direction of the outer shell 31, so that each battery cell assembly 30 has a compact structure and occupies a smaller assembly space; by designing the height of the outer shell 31 to be greater than or equal to 112.5 mm, more active substances can be arranged in the height direction of the outer shell 31 for the battery cell 3, and the battery cell 3 has a higher energy density; by designing the height of the outer shell 31 to be less than or equal to 184 mm, the overall size of the battery device 100 in the gravity direction G is smaller, and the space occupied by the battery device 100 in the gravity direction G is reduced.

[0178] According to some embodiments of the present application, 140 mm ≤ H ≤ 170 mm.

[0179] For example, H can be, but is not limited to, any one of 140 mm, 142 mm, 144 mm, 146 mm, 148 mm, 150 mm, 152 mm, 154 mm, 156 mm, 158 mm, 160 mm, 162 mm, 164 mm, 166 mm, 168 mm or 170 mm, or a range between any two of them.

[0180] By designing the height of the outer shell 31 to be greater than or equal to 140 mm, more active substances can be further arranged in the height direction of the outer shell 31 for the battery cell 3, and the battery cell 3 has a higher energy density; by designing the height of the outer shell 31 to be less than or equal to 170 mm, the overall size of the battery device 100 in the gravity direction G is further reduced, and the space occupied by the battery device 100 in the gravity direction G is reduced.

[0181] Please refer to Figure 11 , Figure 11 which is a perspective view of a battery cell provided by some embodiments of the present application. According to some embodiments of the present application, the battery cell 3 further includes a pressure relief mechanism 33, and along the length direction X of the outer shell, the pressure relief mechanism 33 is disposed at at least one end of the outer shell 31.

[0182] The pressure relief mechanism 33 is used to release the pressure inside the battery cell 3. For example, the pressure relief mechanism 33 can be actuated when the pressure or temperature inside the battery cell 3 reaches a threshold value to release the pressure inside the battery cell 3. The "actuation" mentioned in this application means that the pressure relief mechanism 33 generates an action or is activated to a moving state, so that the internal pressure and temperature of the battery cell 3 can be released. The actions generated by the pressure relief mechanism 33 can include but are not limited to: at least a part of the pressure relief mechanism 33 rupturing, breaking, being torn or opened, etc. When the pressure relief mechanism 33 is actuated, the high-temperature and high-pressure substances inside the battery cell 3 will be discharged outward from the actuated part as emissions. In this way, the battery cell 3 can be depressurized and cooled under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0183] In some embodiments, the pressure relief mechanism 33 can be disposed at one end of the housing 31 along the length direction X of the housing, or the pressure relief mechanism 33 can be disposed at opposite ends of the housing 31 along the length direction X of the housing.

[0184] In some embodiments, when the electrode terminal 32 is disposed at one end of the housing 31 along the length direction X of the housing, the pressure relief mechanism 33 can be disposed at the same end of the housing 31 where the electrode terminal 32 is not disposed, or the pressure relief mechanism 33 can be disposed at opposite ends of the housing 31 with the electrode terminal 32.

[0185] By disposing the pressure relief mechanism 33 at at least one end of the housing 31 along the length direction X of the housing, the space in the length direction X of the housing can be utilized to release the pressure inside the battery cell 3, and there is no need to reserve a pressure relief space in the height direction and the width direction of the housing 31, which is convenient for improving the space utilization rate in the height direction and the width direction of the housing 31 inside the box body 10.

[0186] Please refer to Figure 6 and further refer to Figure 12 Figure 12 is a cross-sectional view of a battery device provided in some other embodiments of the present application. According to some embodiments of the present application, a second flow channel 20a is formed inside the bracket 20, and the second flow channel 20a is used to accommodate a heat exchange medium.

[0187] The second flow channel 20a 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 20a can accommodate a heat exchange medium to facilitate heat exchange through the bracket 20 with the second battery cell assembly 30b.

[0188] In some embodiments, the bracket 20 may have good heat conduction performance to facilitate heat exchange between the heat exchange medium and the second battery cell assembly 30b 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 30b through the bracket 20, which can reduce the temperature of the second battery cell assembly 30b. Another example is that 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 30b through the bracket 20, which can increase the temperature of the second battery cell assembly 30b.

[0189] The heat exchange medium in the second flow channel 20a of the bracket 20 can be a fluid, and the heat exchange medium can be, but is not limited to, water, alcohol or other liquid mixtures.

[0190] By accommodating the heat exchange medium in the second flow channel 20a of the bracket 20, heat exchange can be performed on the battery cells 3 of the second battery cell assembly 30b through the heat exchange medium in the bracket 20, facilitating the adjustment of the temperature of the battery cells 3 of the second battery cell assembly 30b, improving the charge and discharge cycle performance of the second battery cell assembly 30b, and enhancing the reliability of the second battery cell assembly 30b.

[0191] Furthermore, the first battery cell assembly 30a and the bracket 20 are connected by a first thermal conductive adhesive 51 to facilitate heat exchange between the battery cells 3 of the first battery cell assembly 30a and the heat exchange medium in the bracket 20, and to facilitate the adjustment of the temperature of the battery cells 3 of the first battery cell assembly 30a; the second battery cell assembly 30b and the bracket 20 are connected by a second thermal conductive adhesive 52 to facilitate heat exchange between the battery cells 3 of the second battery cell assembly 30b and the heat exchange medium in the bracket 20, and to facilitate the adjustment of the temperature of the battery cells 3 of the second battery cell assembly 30b. Moreover, the first battery cell assembly 30a and the second battery cell assembly 30b share the same thermal management component, which can save the number of thermal management components, reduce the manufacturing cost and space occupancy.

[0192] Please refer to Figure 13 , Figure 13A cross-sectional view of a partial structure of a battery device provided in some other embodiments of the present application. According to some embodiments of the present application, the box body 10 includes a bottom wall 11, and the first battery cell assembly 30a is supported on the bottom wall 11; the battery device 100 further includes a first expansion beam 61 and a second expansion beam 62 that are spaced apart from each other along the length direction U of the battery device, the first expansion beam 61 and the second expansion beam 62 are respectively connected to the bottom wall 11, and the first battery cell assembly 30a is disposed between the first expansion beam 61 and the second expansion beam 62; 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 30a and the second battery cell assembly 30b, the third expansion beam 22 and the fourth expansion beam 23 are spaced apart from each other along the length direction U of the battery device and are respectively connected to the support wall 21, the support wall 21 supports the second battery cell assembly 30b, and the second battery cell assembly 30b is disposed between the third expansion beam 22 and the fourth expansion beam 23.

[0193] Along the gravity direction G, the bottom wall 11 is located at the bottom of the box body 10. For example, the bottom wall 11 may be closer to the ground than other walls of the box body 10. The bottom wall 11 supports the first battery cell assembly 30a along the gravity direction G.

[0194] The first expansion beam 61 and the second expansion beam 62 are located inside the box body 10, and the first expansion beam 61 and the second expansion beam 62 are used to cooperate with the first battery cell assembly 30a to restrict the expansion and deformation of the first battery cell assembly 30a.

[0195] In some embodiments, the first expansion beam 61 may be welded to the bottom wall 11 so that the structure formed by the first expansion beam 61 and the bottom wall 11 has relatively high overall strength; the second expansion beam 62 may be welded to the bottom wall 11 so that the structure formed by the second expansion beam 62 and the bottom wall 11 has relatively high overall strength.

[0196] In some embodiments, the two ends of the first battery cell assembly 30a along the length direction U of the battery device may respectively abut against the first expansion beam 61 and the second expansion beam 62.

[0197] By disposing the first battery cell assembly 30a between the first expansion beam 61 and the second expansion beam 62, the expansion and deformation of the first battery cell assembly 30a can be restricted by the first expansion beam 61 and the second expansion beam 62, which is convenient for improving the reliability of the first battery cell assembly 30a.

[0198] The support wall 21 is a component for supporting the second battery cell assembly 30b, and the second battery cell assembly 30b may be bonded to the support wall 21, which is convenient for realizing the assembly and positioning of the second battery cell assembly 30b.

[0199] In some embodiments, the third expansion beam 22 can be welded to the support wall 21 so that the structure formed by the third expansion beam 22 and the support wall 21 has relatively high overall strength; the fourth expansion beam 23 can be welded to the support wall 21 so that the structure formed by the fourth expansion beam 23 and the support wall 21 has relatively high overall strength.

[0200] In some embodiments, both ends of the second battery cell assembly 30b along the length direction U of the battery device can respectively abut against the third expansion beam 22 and the fourth expansion beam 23.

[0201] By arranging the second battery cell assembly 30b between the third expansion beam 22 and the fourth expansion beam 23, the expansion deformation of the second battery cell assembly 30b can be constrained by the third expansion beam 22 and the fourth expansion beam 23, which is convenient for improving the reliability of the second battery cell assembly 30b.

[0202] In some embodiments, the third expansion beam 22 and the first expansion beam 61 are arranged corresponding to each other, and the fourth expansion beam 23 and the second expansion beam 62 are arranged corresponding to each other. For example, on the same projection plane perpendicular to the gravity direction G, the positive projection of the third expansion beam 22 and the positive projection of the first expansion beam 61 at least partially overlap, and the positive projection of the fourth expansion beam 23 and the positive projection of the second expansion beam 62 at least partially overlap.

[0203] According to some embodiments of the present application, the bracket 20 can be connected to the first expansion beam 61 and the second expansion beam 62, and the first expansion beam 61 and the second expansion beam 62 can be configured to support the bracket 20.

[0204] In some embodiments, the first expansion beam 61 can be provided with a first threaded hole, the second expansion beam 62 can be provided with a second threaded hole, the bracket 20 is provided with a first through hole corresponding to the first threaded hole and a second through hole corresponding to the second threaded hole, the battery device 100 further includes a first fastener 71 and a second fastener 72, the first fastener 71 passes through the first through hole and is connected to the first threaded hole, and the second fastener 72 passes through the second through hole and is connected to the second threaded hole, so that the bracket 20 is connected to the first expansion beam 61 and the second expansion beam 62. In this assembly manner, the bracket 20 can be entirely located inside the box body 10, and the fixing positions of the bracket 20 can be distributed along the length direction U of the battery device, so as to reduce the space occupation in the width direction V of the box body 10 inside the battery device, make the space utilization rate in the width direction V of the box body 10 inside the battery device relatively high, and further improve the energy density of the battery device 100.

[0205] For example, the third expansion beam 22 is provided with a first through hole, and the fourth expansion beam 23 is provided with a second through hole. The first fastener 71 passes through the third expansion beam 22 and then connects to the first threaded hole, and the second fastener 72 passes through the fourth expansion beam 23 and then connects to the second threaded hole. The first fastener 71 and the second fastener 72 can be threaded components, such as bolts, screws, etc. The first threaded hole can be a threaded hole opened in the first expansion beam 61 or a threaded hole of a nut provided on the first expansion beam 61. The second threaded hole can be a threaded hole opened in the second expansion beam 62 or a threaded hole of a nut provided on the second expansion beam 62.

[0206] In an embodiment where the bracket 20 is connected to the first expansion beam 61 and the second expansion beam 62, along the gravity direction G, the distance between the first battery cell assembly 30a and the support wall 21 of the bracket 20 can be relatively small. A second flow channel 20a can be provided inside the bracket 20, and the second flow channel 20a is used to accommodate a heat exchange medium; the first battery cell assembly 30a can be connected to the bracket 20 through a first thermal conductive adhesive 51. While improving the space utilization rate inside the box body 10 in the gravity direction G, the heat exchange medium inside the bracket 20 can also perform heat exchange on the first battery cell assembly 30a, improving the energy density and reliability of the battery device 100.

[0207] In some embodiments, the support wall 21 is provided with a second flow channel 20a, and the second flow channel 20a is used to accommodate a heat exchange medium.

[0208] Please refer to Figure 2 and further refer to Figure 12 and Figure 13 According to some embodiments of the present application, the battery device 100 further includes a restraint member 80. The restraint member 80 connects the third expansion beam 22 and the fourth expansion beam 23, and the restraint member 80 is connected to the side of the second battery cell assembly 30b facing away from the first battery cell assembly 30a.

[0209] The restraint member 80 is a component for connecting the third expansion beam 22 and the fourth expansion beam 23. The material of the restraint member 80 can be metal, for example, iron, aluminum, or alloy, etc. In some embodiments, when the material of the restraint member 80 is metal, an insulating layer can be provided on the surface of the restraint member 80 to separate the restraint member 80 from the second battery cell assembly 30b, reducing the risk of positive and negative pole contact short circuit.

[0210] In some embodiments, the restraint member 80 extends along the length direction U of the battery device, and both ends of the restraint member 80 along the length direction U of the battery device are respectively connected to the third expansion beam 22 and the fourth expansion beam 23.

[0211] The restraint member 80 and the third expansion beam 22 can be detachably connected by a third fastener, and the restraint member 80 and the fourth expansion beam 23 can be detachably connected by a fourth fastener, facilitating assembly and disassembly. For example, the third fastener and the fourth fastener can be threaded components (such as bolts, screws, etc.); the third expansion beam 22 can be provided with a third threaded hole, the fourth expansion beam 23 can be provided with a fourth threaded hole, and the restraint member 80 can be provided with a third through hole corresponding to the third threaded hole and a fourth through hole corresponding to the fourth threaded hole. The third fastener passes through the third through hole and is connected to the third threaded hole, and the fourth fastener passes through the fourth through hole and is connected to the fourth threaded hole. The third threaded hole can be a threaded hole opened in the third expansion beam 22 or a threaded hole of a nut provided on the third expansion beam 22. The fourth threaded hole can be a threaded hole opened in the fourth expansion beam 23 or a threaded hole of a nut provided on the fourth expansion beam 23.

[0212] By connecting the third expansion beam 22 and the fourth expansion beam 23 with the restraint member 80, it is possible to restrain the second battery cell assembly 30b from moving in a direction away from the first battery cell assembly 30a, and it is possible to improve the anti-expansion deformation effect of the third expansion beam 22 and the fourth expansion beam 23 on the second battery cell assembly 30b, further improving the reliability of the second battery cell assembly 30b.

[0213] Please refer to Figure 12 , according to some embodiments of the present application, a second flow channel 20a is formed inside the bracket 20, and the second flow channel 20a is used to accommodate a heat exchange medium; a third flow channel 11a is formed inside the bottom wall 11, and the third flow channel 11a is used to accommodate a heat exchange medium; a fourth flow channel 80a is formed inside the restraint member 80, and the fourth flow channel 80a is used to accommodate a heat exchange medium.

[0214] The bracket 20, the bottom wall 11 and the restraint member 80 can form three heat management components. The first battery cell assembly 30a is disposed between the bottom wall 11 and the bracket 20, and heat exchange is performed on the first battery cell assembly 30a through the heat exchange medium inside the bottom wall 11 and the heat exchange medium inside the bracket 20; the second battery cell assembly 30b is disposed between the bracket 20 and the restraint member 80, and heat exchange is performed on the second battery cell assembly 30b through the heat exchange medium inside the bracket 20 and the heat exchange medium inside the restraint member 80.

[0215] By accommodating a heat exchange medium in the second flow channel 20a, the temperature of the second battery cell assembly 30b can be adjusted, and the temperature of the first battery cell assembly 30a can also be adjusted, which is convenient for improving the charge and discharge cycle performance of the second battery cell assembly 30b and the first battery cell assembly 30a, and improving the reliability of the second battery cell assembly 30b and the first battery cell assembly 30a; by accommodating a heat exchange medium in the third flow channel 11a, the temperature of the first battery cell assembly 30a can be adjusted, which is convenient for improving the charge and discharge cycle performance of the first battery cell assembly 30a and improving the reliability of the first battery cell assembly 30a; by accommodating a heat exchange medium in the fourth flow channel 80a, the temperature of the second battery cell assembly 30b can be adjusted, which is convenient for improving the charge and discharge cycle performance of the second battery cell assembly 30b and improving the reliability of the second battery cell assembly 30b.

[0216] According to some embodiments of the present application, the restraint member 80 has a plate-like structure, and in the same projection plane perpendicular to the gravity direction G, the orthographic projection of the second battery cell assembly 30b falls within the orthographic projection of the restraint member 80.

[0217] The restraint member 80 has a plate-like structure, and there is a large overlapping area between the restraint member 80 and the second battery cell assembly 30b. The restraint member 80 can be provided with a heat exchange interface with a large area to improve the heat exchange effect on the second battery cell assembly 30b.

[0218] By designing the restraint member 80 into a plate-like structure and the orthographic projection of the second battery cell assembly 30b falling within the orthographic projection of the restraint member 80, the capacity of the fourth flow channel 80a can be designed to be relatively large, and more heat exchange medium can be provided inside the restraint member 80, which is convenient for adjusting the temperature of the second battery cell assembly 30b, improving the charge and discharge cycle performance of the second battery cell assembly 30b, and improving the reliability of the second battery cell assembly 30b.

[0219] According to some embodiments of the present application, please refer to Figure 12 , the first battery cell assembly 30a is connected to the bottom wall 11 through the third thermal conductive adhesive 53, the first battery cell assembly 30a is connected to the bracket 20 through the first thermal conductive adhesive 51, the second battery cell assembly 30b is connected to the bracket 20 through the second thermal conductive adhesive 52, and the second battery cell assembly 30b is connected to the restraint member 80 through the fourth thermal conductive adhesive 54.

[0220] In the height direction of the battery device 100, the bottom wall 11, the bracket 20, and the restraint member 80 are spaced apart. Moreover, the distance between the first battery cell assembly 30a and the bracket 20 is small, and the distance between the second battery cell assembly 30b and the restraint member 80 is small, so that the space utilization rate inside the box body 10 in the height direction of the battery device 100 is relatively high, and further the battery device 100 has a relatively high energy density. At the same time, the first battery cell assembly 30a and the bottom wall 11 are connected by a third thermal conductive adhesive 53, which facilitates heat exchange between the first battery cell assembly 30a and the heat exchange medium in the bottom wall 11; the first battery cell assembly 30a and the bracket 20 are connected by a first thermal conductive adhesive 51, which facilitates heat exchange between the first battery cell assembly 30a and the heat exchange medium in the bracket 20; the second battery cell assembly 30b and the bracket 20 are connected by a second thermal conductive adhesive 52, which facilitates heat exchange between the second battery cell assembly 30b and the heat exchange medium in the bracket 20; the second battery cell assembly 30b and the restraint member 80 are connected by a fourth thermal conductive adhesive 54, which facilitates heat exchange between the second battery cell assembly 30b and the heat exchange medium in the restraint member 80, so that the first battery cell assembly 30a and the second battery cell assembly 30b have relatively high reliability.

[0221] According to some embodiments of the present application, the number of the restraint members 80 is multiple, and the multiple restraint members 80 are spaced apart along the width direction V of the battery device.

[0222] The multiple restraint members 80 may include a first end restraint member and a second end restraint member. Along the width direction V of the battery device, the first end restraint member and the second end restraint member may be disposed at opposite ends of the second battery cell assembly 30b.

[0223] By spacing the multiple restraint members 80 along the width direction V of the battery device, constraints can be provided to the second battery cell assembly 30b at multiple positions in the width direction V of the battery device, further restricting the movement of the second battery cell assembly 30b in the direction away from the first battery cell assembly 30a.

[0224] According to some embodiments of the present application, embodiments of the present application 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 electric energy.

[0225] Please refer to Figure 14 and Figure 15 , Figure 14 which is an assembly schematic diagram of a vehicle frame and a battery device provided in some embodiments of the present application, Figure 15A cross-sectional view of the frame and the battery device in the assembled state provided by some embodiments of the present application. According to some embodiments of the present application, the electrical device is a vehicle 1000, the vehicle 1000 includes a frame 400, the frame 400 includes a cross beam 410 and two longitudinal beams 420, the two longitudinal beams 420 are arranged at intervals along the width direction V of the battery device, the cross beam 410 connects the two longitudinal beams 420, the battery device 100 is connected to the frame 400, and the length direction of the longitudinal beam 420 is parallel to the length direction U of the battery device; the width direction V of the battery device, the length direction U of the battery device, and the gravity direction G are perpendicular to each other in pairs.

[0226] The longitudinal beam 420 extends along the length direction of the frame 400, and the length direction of the longitudinal beam 420 is parallel to the length direction of the frame 400.

[0227] The cross beam 410 extends along the width direction of the frame 400, and both ends of the cross beam 410 are respectively connected to the two longitudinal beams 420.

[0228] Both ends of the battery device 100 in the width direction V of the battery device are respectively connected to the two longitudinal beams 420, and the battery device 100 can also be connected to the cross beam 410 to improve the connection reliability between the battery device 100 and the frame 400.

[0229] In some embodiments, the length direction X of the housing can be parallel to the width direction V of the battery device, so that the battery device 100 can be provided with more active materials in the space between the two longitudinal beams 420, and the energy density of the battery device 100 is improved. Optionally, the length of the housing 31 is greater than half of the width of the battery device 100. Along the width direction V of the battery device, one battery cell column 30c is provided for each battery cell assembly 30, and the battery cell column 30c includes a plurality of battery cells 3 stacked along the length direction U of the battery device.

[0230] By connecting the battery device 100 to the frame 400 and making the length direction of the longitudinal beam 420 parallel to the length direction U of the battery device, the battery device 100 can utilize the space in the length direction of the longitudinal beam 420, and more active materials can be arranged in the length direction of the longitudinal beam 420, so that the battery device 100 has a higher energy density.

[0231] According to some embodiments of the present application, please refer to Figures 2 to 15, an embodiment of the present application provides a battery device 100, which includes a box body 10, a bracket 20, a first battery cell assembly 30a, and a second battery cell assembly 30b. The bracket 20 is disposed inside the box body 10, dividing the internal space of the box body 10 into a first accommodation space Q1 and a second accommodation space Q2 on both sides of the bracket 20. The first accommodation space Q1 and the second accommodation space Q2 are arranged along the gravity direction G; the first battery cell assembly 30a is disposed in the first accommodation space Q1 and supported by the box body 10; the second battery cell assembly 30b is disposed in the second accommodation space Q2 and supported by the bracket 20.

[0232] Each battery cell assembly 30 includes a plurality of battery cells 3. Each battery cell 3 includes a housing 31 and electrode terminals 32. The width and height of the housing 31 are both smaller than the length of the housing 31. Along the length direction X of the housing, the electrode terminals 32 are disposed at at least one end of the housing 31. The length direction X of the housing is parallel to the width direction V of the battery device, and the length direction X of the housing is perpendicular to the gravity direction G. The length of the housing 31 is L, satisfying 300 mm ≤ L ≤ 2500 mm.

[0233] In each battery cell assembly 30, by setting the length of the housing 31 of the battery cell 3 to be greater than or equal to 300 mm, the battery device 100 can be provided with a smaller number of battery cells 3 in the width direction V of the battery device, saving the space occupied by components such as the housing 31 of the battery cells 3, improving the space utilization rate of the battery device 100 in the width direction V of the battery device, and further improving the energy density of the battery device 100; by designing the length of the housing 31 of the battery cell 3 to be less than or equal to 2500 mm, it is convenient for processing and manufacturing and for the assembly of the battery cell 3 with the box body 10.

[0234] The box body 10 includes a bottom wall 11, and the first battery cell assembly 30a is supported by the bottom wall 11; the battery device 100 further includes a first expansion beam 61 and a second expansion beam 62 spaced apart along the length direction U of the battery device. The first expansion beam 61 and the second expansion beam 62 are respectively connected to the bottom wall 11, and the first battery cell assembly 30a is disposed between the first expansion beam 61 and the second expansion beam 62; 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 30a and the second battery cell assembly 30b. The third expansion beam 22 and the fourth expansion beam 23 are spaced apart along the length direction U of the battery device and respectively connected to the support wall 21. The support wall 21 supports the second battery cell assembly 30b, and the second battery cell assembly 30b is disposed between the third expansion beam 22 and the fourth expansion beam 23. The battery device 100 further includes a restraint member 80. The restraint member 80 connects the third expansion beam 22 and the fourth expansion beam 23, and the restraint member 80 is connected to the side of the second battery cell assembly 30b facing away from the first battery cell assembly 30a.

[0235] A second flow channel 20a is formed inside the bracket 20 for accommodating a heat exchange medium; a third flow channel 11a is formed inside the bottom wall 11 for accommodating a heat exchange medium; a fourth flow channel 80a is formed inside the restraint member 80 for accommodating a heat exchange medium. The first battery cell assembly 30a and the bottom wall 11 are connected by a third thermal conductive adhesive 53, the first battery cell assembly 30a and the bracket 20 are connected by a first thermal conductive adhesive 51, the second battery cell assembly 30b and the bracket 20 are connected by a second thermal conductive adhesive 52, and the second battery cell assembly 30b and the restraint member 80 are connected by a fourth thermal conductive adhesive 54. In the height direction of the battery device 100, the bottom wall 11, the bracket 20, and the restraint member 80 are spaced apart, and the distance between the first battery cell assembly 30a and the bracket 20 is small, and the distance between the second battery cell assembly 30b and the restraint member 80 is small, so that the space utilization rate in the height direction of the battery device 100 inside the box body 10 is high, and further the battery device 100 has a high energy density. At the same time, the first battery cell assembly 30a and the bottom wall 11 are connected by the third thermal conductive adhesive 53, facilitating heat exchange between the first battery cell assembly 30a and the heat exchange medium inside the bottom wall 11; the first battery cell assembly 30a and the bracket 20 are connected by the first thermal conductive adhesive 51, facilitating heat exchange between the first battery cell assembly 30a and the heat exchange medium inside the bracket 20; the second battery cell assembly 30b and the bracket 20 are connected by the second thermal conductive adhesive 52, facilitating heat exchange between the second battery cell assembly 30b and the heat exchange medium inside the bracket 20; the second battery cell assembly 30b and the restraint member 80 are connected by the fourth thermal conductive adhesive 54, facilitating heat exchange between the second battery cell assembly 30b and the heat exchange medium inside the restraint member 80, so that the first battery cell assembly 30a and the second battery cell assembly 30b have high reliability.

[0236] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein 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 way. 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; A bracket, disposed within the box body, 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 being arranged along the direction of gravity; A first battery cell assembly and a second battery cell assembly, the first battery cell assembly being disposed in the first accommodation space and supported by the box body; the second battery cell assembly being disposed in the second accommodation space and supported by the bracket; The first battery cell assembly is connected to the bracket through a first thermal conductive adhesive, and the second battery cell assembly is connected to the bracket through a second thermal conductive adhesive; Each battery cell assembly includes a plurality of battery cells, and each battery cell includes a housing and electrode terminals. The width and height of the housing are both smaller than the length of the housing. Along the length direction of the housing, the electrode terminals are disposed at at least one end of the housing. The length direction of the housing is perpendicular to the direction of gravity, and the length of the housing is L, satisfying 300 mm ≤ L ≤ 2500 mm.

2. The battery device according to claim 1, characterized in that, 600 mm ≤ L ≤ 2500 mm.

3. The battery device according to claim 2, wherein The length direction of the housing is parallel to the width direction of the battery device; The plurality of battery cells in each battery cell assembly are stacked along the length direction of the battery device; The width direction of the battery device, the length direction of the battery device, and the direction of gravity are perpendicular to each other in pairs.

4. The battery device according to claim 3, characterized in that, The length of the housing is greater than half of the width of the battery device.

5. The battery device according to claim 3, characterized in that, The electrode terminals include a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are disposed at the same end of the housing in the length direction of the housing; or, The electrode terminals include a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are respectively disposed at opposite ends of the housing in the length direction of the housing.

6. The battery device according to claim 1, characterized in that, 300 mm ≤ L < 600 mm.

7. The battery device according to claim 6, wherein The length direction of the housing is parallel to the width direction of the battery device; Each battery cell assembly includes two battery cell columns, each battery cell column including a plurality of the battery cells stacked along the length direction of the battery device, and the two battery cell columns are arranged along the width direction of the battery device; The width direction of the battery device, the length direction of the battery device, and the direction of gravity are perpendicular to each other in pairs.

8. The battery device according to claim 7, characterized in that, A separator is disposed between the two battery cell columns of the same battery cell assembly, and a first flow channel is formed inside the separator for accommodating a heat exchange medium.

9. The battery device according to claim 8, wherein, In the same battery cell assembly, the electrode terminals of the battery cells in one battery cell column are arranged back-to-back with the electrode terminals of the battery cells in the other battery cell column.

10. The battery device according to claim 6, wherein, The length direction of the housing is parallel to the length direction of the battery device; Each battery cell assembly includes a plurality of battery cell columns, each battery cell column including a plurality of the battery cells stacked along the width direction of the battery device, and the plurality of battery cell columns are arranged along the length direction of the battery device; The width direction of the battery device, the length direction of the battery device, and the gravity direction are perpendicular to each other in pairs.

11. The battery device according to claim 1, characterized in that, The height direction of the housing is parallel to the gravity direction, and the height of the housing is H, satisfying 112.5 mm ≤ H ≤ 184 mm.

12. The battery device according to claim 11, characterized in that, 140 mm ≤ H ≤ 170 mm.

13. The battery device according to claim 1, characterized in that, The battery cell further includes a pressure relief mechanism, and along the length direction of the housing, the pressure relief mechanism is disposed at at least one end of the housing.

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

15. The battery device according to any one of claims 1-14, characterized in that, The box body includes a bottom wall, and the first battery cell assembly is supported on the bottom wall; The battery device further includes a first expansion beam and a second expansion beam that are spaced apart along the length direction of the battery device. The first expansion beam and the second expansion beam are respectively connected to the bottom wall, and the first battery cell assembly is disposed between the first expansion beam and the second expansion beam; 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 spaced apart along the length direction of the battery device 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.

16. The battery device according to claim 15, wherein, The battery device further includes a restraint member that connects the third expansion beam and the fourth expansion beam, and the restraint member is connected to a side of the second battery cell assembly facing away from the first battery cell assembly.

17. The battery device according to claim 16, wherein A second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium; A third flow channel is formed inside the bottom wall, and the third flow channel is used to accommodate a heat exchange medium; A fourth flow channel is formed inside the restraint member, and the fourth flow channel is used to accommodate a heat exchange medium.

18. The battery device according to claim 16, characterized in that, The restraint member is a plate-like structure, and in the same projection plane perpendicular to the gravity direction, the orthographic projection of the second battery cell assembly falls within the orthographic projection of the restraint member.

19. The battery device according to claim 16, characterized in that, The number of the restraint members is multiple, and the multiple restraint members are spaced apart along the width direction of the battery device.

20. An electrical device, characterized in that, Including the battery device according to any one of claims 1-19, the battery device is used to provide electric energy.

21. The electrical device according to claim 20, characterized in that, The electrical device is a vehicle, the vehicle includes a vehicle frame, the vehicle frame includes a cross beam and two longitudinal beams, the two longitudinal beams are spaced apart along the width direction of the battery device, the cross beam connects the two longitudinal beams, the battery device is connected to the vehicle frame, and the length direction of the longitudinal beam is parallel to the length direction of the battery device; The width direction of the battery device, the length direction of the battery device, and the gravity direction are perpendicular to each other in pairs.

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