Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a box body and a battery monomer group arranged in a containing cavity of the box body, the box body comprises a first box wall, a second box wall and a containing cavity located between the first box wall and the second box wall, the first box wall and the second box wall are arranged in a spaced mode in the first direction, and the second box wall comprises a first area and a second area. The distance from the first area to the first box wall in the first direction is larger than the distance from the second area to the first box wall in the first direction, the battery monomer group comprises a first battery monomer and a second battery monomer, the thickness direction of the first battery monomer is parallel to the second direction, and the first battery monomer is arranged in the first area; the thickness direction of the second battery monomer is parallel to the first direction, and the size requirement of the second battery monomer in the first direction is lower than that of the second battery monomer, so that the second battery monomer can be arranged in the second area, the utilization rate of the internal space of the box body is improved, and the energy density of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and an electrical device. Background Art

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools, etc.

[0003] The housing is a crucial component of a battery device, housing and protecting the battery cells within. Utilizing the internal space within the housing to increase the energy density of the battery device remains a pressing technical challenge. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the utilization rate of the internal space of the box and increase the energy density of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a box body, comprising a first box wall and a second box wall spaced apart in a first direction, and a accommodating cavity located between the first box wall and the second box wall, the second box wall comprising a first region and a second region adjacently arranged in a second direction, the distance from the first region to the first box wall along the first direction being greater than the distance from the second region to the first box wall along the first direction; a battery cell group, arranged in the accommodating cavity, the battery cell group comprising a first battery cell and a second battery cell, the first battery cell being arranged in the first region, the thickness direction of the first battery cell being parallel to the second direction, the second battery cell being arranged in the second region, the thickness direction of the second battery cell being parallel to the first direction, and the first direction and the second direction intersecting.

[0006] In the solution of the embodiment of the present application, the battery device includes a box body and a battery cell group arranged in a accommodating cavity of the box body, the box body includes a first box wall and a second box wall spaced apart in a first direction and a accommodating cavity located between the first box wall and the second box wall, the second box wall includes a first area and a second area, the distance from the first area to the first box wall along the first direction is greater than the distance from the second area to the first box wall along the first direction, the battery cell group includes a first battery cell and a second battery cell, the thickness direction of the first battery cell is parallel to the second direction, the first battery cell is arranged in the first area, the thickness direction of the second battery cell is parallel to the first direction, and the size requirement of the second battery cell in the first direction is lower than that of the second battery cell, so that the second battery cell can be arranged in the second area, thereby improving the utilization rate of the internal space of the box body and improving the energy density of the battery device.

[0007] In some embodiments, the battery device also includes a thermal management component, which is arranged in the accommodating cavity. The thermal management component includes a first heat exchange mechanism and a second heat exchange mechanism. The first heat exchange mechanism is thermally connected to the first battery cell along the second direction, and the second heat exchange mechanism is thermally connected to the second battery cell along the first direction.

[0008] In the solution of the embodiment of the present application, the thermal management component includes a first heat exchange mechanism and a second heat exchange mechanism. The first heat exchange mechanism is thermally connected to the first battery cell along the second direction to adjust the temperature of the first battery cell. The second heat exchange mechanism is thermally connected to the second battery cell along the first direction to adjust the temperature of the second battery cell to improve the performance of the battery device.

[0009] In some embodiments, the battery device further includes a first adhesive layer, which is disposed between the second heat exchange mechanism and the second box wall, and the second heat exchange mechanism is connected to the second box wall through the first adhesive layer.

[0010] In the solution of the embodiment of the present application, the second heat exchange mechanism is connected to the second box wall through the first adhesive layer to improve the overall stability of the battery device.

[0011] In some embodiments, the first heat exchange mechanism includes a first main body and a first current collector, the first main body is thermally connected to the first battery cell along the second direction, the first current collector is arranged at at least one end of the first main body in the third direction and extends out of the first battery cell, the second heat exchange mechanism includes a second main body and a second current collector, the second main body is thermally connected to the battery cell along the first direction, the second current collector is arranged at at least one end of the second main body in the third direction and extends out of the second battery cell, and the thermal management component also includes a connecting mechanism, which is connected to the first current collector and at least one second current collector adjacent to each other in the second direction.

[0012] In the solution of the embodiment of the present application, the first current collector and the second current collector adjacent to each other in the second direction are connected through a connecting mechanism, so that the first heat exchange mechanism and the second heat exchange mechanism in the accommodating cavity can be connected to each other, thereby reducing the overall size of the thermal management component, improving the utilization rate of the internal space of the box, and improving the energy density of the battery device.

[0013] In some embodiments, the thermal management component includes at least two second heat exchange mechanisms spaced apart along a first direction, the connecting mechanism includes a first connecting member, the first connecting member includes a confluence portion, a collecting portion and at least two diversion portions that are interconnected, the at least two diversion portions and the at least two second collecting portions are arranged in a one-to-one correspondence, and the confluence portion and the first collecting portion are connected.

[0014] In the solution of the embodiment of the present application, the first connecting member includes a converging portion, a collecting portion and at least two diverting portions that are interconnected. The converging portion is connected to the first collecting portion, and the at least two diverting portions and at least two second collecting portions are arranged in a one-to-one correspondence, so that the heat exchange medium can be distributed from the first heat exchange mechanism to several second heat exchange mechanisms through the first connecting member, so that the first heat exchange mechanism and the second heat exchange mechanism are smoothly connected.

[0015] In some embodiments, the converging portion and the collecting portion are connected with a transition rounded corner, and / or the collecting portion and the dividing portion are connected with a transition rounded corner.

[0016] In the solution of the embodiment of the present application, the converging part and the collecting part are connected with a transition rounded corner, and / or the collecting part and the diverter part are connected with a transition rounded corner to reduce the flow resistance of the heat exchange mechanism in the first connecting part and improve the performance of the thermal management component.

[0017] In some embodiments, the battery cell group includes a plurality of second battery cells spaced apart along a second direction, the thermal management assembly includes a plurality of heat exchange groups spaced apart along the second direction, the heat exchange group includes at least two second heat exchange mechanisms spaced apart along a first direction, and two adjacent heat exchange groups include two first connecting members relatively arranged, the two confluence parts of the two first connecting members are connected to each other, and the respective branch parts of the two first connecting members are respectively connected to the second collectors of the two heat exchange groups; or, the connecting mechanism includes a second connecting member extending in the second direction, and at least two second connecting members spaced apart along the first direction are provided between the two adjacent heat exchange groups, and the second connecting member is connected to the two second collectors of the two adjacent heat exchange groups.

[0018] In the solution of the embodiment of the present application, the battery cell group includes a plurality of second battery cells arranged at intervals along the second direction to increase the capacity of the battery device, and the thermal management component includes a plurality of heat exchange groups arranged at intervals along the second direction to better control the temperature of the second battery cells. The two adjacent heat exchange groups are connected through two first connecting members arranged opposite to each other, thereby reducing the number of molds for the thermal management component and reducing the processing cost of the thermal management component, or the connecting mechanism includes a second connecting member extending in the second direction, and the second connecting member is connected to the two second current collectors of the two adjacent heat exchange groups. At least two second connecting members arranged at intervals along the first direction are provided between the two adjacent heat exchange groups. The flow resistance of the heat exchange medium in the second connecting member is small, which helps to improve the heat exchange effect of the second heat exchange mechanism and improve the performance of the battery device.

[0019] In some embodiments, the second current collector includes a base and a connecting portion, the base is arranged at one end of the second main body in the third direction, the connecting portion is connected to the second main body through the base, the connecting portion includes an opening at at least one end in the second direction, and the connecting mechanism is connected to the opening of the connecting portion along the second direction.

[0020] In the embodiment of the present application, the second current collector includes a base and a connecting portion, the connecting portion includes an opening at least at one end in the second direction, and the connecting mechanism is connected to the opening of the connecting portion along the second direction, which helps to reduce the difficulty of connecting the connecting mechanism and the second heat exchange mechanism.

[0021] In some embodiments, the connecting portion is disposed on one side of the base in the first direction and is connected to the base along the first direction.

[0022] In the embodiment of the present application, the connecting portion is arranged on one side of the base in the first direction and is connected to the base along the first direction to reduce the size requirement of the second heat exchange mechanism in the third direction, which helps to improve the utilization rate of the internal space of the box.

[0023] In some embodiments, the first box wall includes a planar portion and a recessed portion adjacent to each other in the second direction, the recessed portion protrudes toward the accommodating cavity, the planar portion's projection along the first direction is in the first area, and the recessed portion's projection along the first direction is in the second area.

[0024] In the solution of the embodiment of the present application, a recessed portion corresponding to the second area is formed on the first box wall. Since the size requirement of the second battery cell in the first direction is low, the recessed portion can protrude toward the accommodating cavity. When the battery device is used in electrical devices such as vehicles, the recessed portion helps to lower the footrest height of the driver and passengers, thereby improving the driving experience of the driver and passengers.

[0025] In a second aspect, an embodiment of the present application provides an electrical device, comprising the battery device of any embodiment of the first aspect described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 is a structural schematic diagram of a vehicle provided in one embodiment of the present application;

[0028] Figure 2 is a structural schematic diagram of a battery device provided in one embodiment of the present application;

[0029] Figure 3 This is a schematic structural diagram of a battery module provided in one embodiment of the application;

[0030] Figure 4 is an exploded view of a battery cell provided in one embodiment of the present application;

[0031] Figure 5is a structural schematic diagram of a battery device provided in one embodiment of the present application;

[0032] Figure 6 This is a schematic structural diagram of a box body of a battery device provided in one embodiment of the present application;

[0033] Figure 7 This is a partial structural diagram of a battery device provided in one embodiment of the present application;

[0034] Figure 8 This is a partial structural diagram of a battery device provided in one embodiment of the present application;

[0035] Figure 9 This is a partial structural diagram of a battery device provided in one embodiment of the present application;

[0036] Figure 10 This is a partial structural diagram of a battery device provided in one embodiment of the present application;

[0037] Figure 11 yes Figure 10 Schematic diagram of the enlarged structure at A in the middle;

[0038] Figure 12 This is a partial structural diagram of a battery device provided in one embodiment of the present application;

[0039] Figure 13 yes Figure 12 Schematic diagram of the enlarged structure at point B in the middle.

[0040] Reference numerals:

[0041] 1. Vehicle; 101. Motor; 102. Controller;

[0042] 2. Battery device; 201. Battery module; 202. Box; 203. First adhesive layer;

[0043] 3. Battery cell; 4. Housing; 5. Electrode assembly; 6. Electrode terminal;

[0044] 71, first box wall; 72, second box wall; 73, accommodating cavity; 711, flat portion; 712, recessed portion; 721, first region; 722, second region;

[0045] 8. Battery cell group; 81. First battery cell; 82. Second battery cell;

[0046] 9. Thermal management assembly; 91. First heat exchange mechanism; 92. Second heat exchange mechanism; 93. Connecting mechanism; 94. Heat exchange group; 911. First main body; 912. First current collector; 921. Second main body; 922. Second current collector; 9221. Base; 9222. Connecting portion; 931. First connecting member; 932. Second connecting member; 933. Third connecting member; 9311. Converging portion; 9312. Converging portion; 9313. Diverting portion;

[0047] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0051] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0052] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] Currently, market developments indicate that battery applications are becoming increasingly widespread. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0055] The housing is a crucial component of a battery device, housing and protecting the battery cells within. Utilizing the internal space within the housing to increase the energy density of the battery device remains a pressing technical challenge.

[0056] The reason for the above problem is that when the battery device is used in electrical devices such as vehicles, in order to optimize the driving experience, a footwell is set on the box to lower the footrest height of the driver and passengers and reduce the leg fatigue of the driver and passengers. However, this also causes the size of the internal space of the box in the footwell area to be reduced in the first direction. The vertically arranged battery cells cannot be arranged in this area, resulting in a waste of internal space of the box and a reduction in the energy density of the battery device.

[0057] Based on the above problems, an embodiment of the present application provides a battery device, which includes a box body and a battery cell group arranged in a accommodating cavity of the box body, the box body includes a first box wall and a second box wall spaced apart in a first direction and a accommodating cavity located between the first box wall and the second box wall, the second box wall includes a first area and a second area, the distance from the first area to the first box wall along the first direction is greater than the distance from the second area to the first box wall along the first direction, the battery cell group includes a first battery cell and a second battery cell, the thickness direction of the first battery cell is parallel to the second direction, the first battery cell is arranged in the first area, the thickness direction of the second battery cell is parallel to the first direction, and the size requirement of the second battery cell in the first direction is lower than that of the second battery cell, so that the second battery cell can be arranged in the second area, thereby improving the utilization rate of the internal space of the box and improving the energy density of the battery device.

[0058] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0059] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0060] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0061] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the present invention does not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, and the present invention does not limit this.

[0062] The battery device referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery device referred to in this application may include a battery module or battery pack. A battery pack generally includes a casing for enclosing one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer, with the negative active material layer coated on the surface of the current collector. The negative current collector comprises a negative current collecting portion and a negative tab connected to the negative current collecting portion. The negative current collecting portion is coated with the negative active material layer, while the negative tab is not. The negative current collector can be made of copper, and the negative active material layer includes a negative active material, such as carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0064] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment using the battery devices. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0065] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1 provided for some embodiments of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may serve as an operating power source for the vehicle 1. The vehicle 1 may further include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0066] In some embodiments of the present application, the battery device 2 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0067] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0068] The battery device 2 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 3, and the multiple battery cells 3 are connected in series, parallel or mixed via a busbar.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0070] As an example, the battery cell assembly may be a battery module 201, wherein the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 201 may be formed by bundling the plurality of battery cells 3 with a cable tie.

[0071] In some embodiments, the battery device may be a battery pack, which includes a case 202 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 202 .

[0072] As an example, the battery cell assembly may be a battery module 201 , and the battery cell assembly may be accommodated in the box 202 by fixing the battery module 201 in the box.

[0073] As an example, the battery cell assembly may also be housed in the box body 202 by directly fixing the plurality of battery cells 3 to the box body 202 .

[0074] As an example, the housing 202 may include a first wall 71 and a second wall 72. The first wall 71 and the second wall 72 interlock to form an enclosed space within the housing 202 for accommodating the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first wall 71 may be an end cap or a bottom plate.

[0075] As an example, the box body 202 may include end covers, a frame, and a bottom plate. The end covers and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly.

[0076] In some embodiments, the box 202 can be used as part of the chassis structure of the vehicle. For example, part of the box 202 can become at least a part of the floor of the vehicle, or part of the box 202 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0077] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0078] In some embodiments, as Figure 2 and Figure 3As shown, there are multiple battery cells 3, which are first connected in series, in parallel, or in series to form a battery module 201. The multiple battery modules 201 are then connected in series, in parallel, or in series to form a whole, and are accommodated in a box 202.

[0079] The multiple battery cells 3 in the battery module 201 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0080] Figure 4 : is an exploded view of a battery cell provided in one embodiment of the present application. Battery cell 3 refers to the smallest unit that constitutes a battery device. Figure 4 The battery cell 3 includes an end cover assembly, a shell 4 and an electrode assembly 5.

[0081] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be contained in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking electrode sheets, which are divided into positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the electrode ear. The positive electrode ear and the negative electrode ear may be located together at one end of the electrode body or respectively at both ends of the electrode body. During the charge and discharge process of the battery cell 3, the positive electrode active material and the negative electrode active material react with the electrolyte, and the ear is connected to the electrode terminal 6 to form a current loop.

[0082] The electrode assembly 5 may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0083] In some embodiments, the electrode assembly 5 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0084] In some embodiments, the electrode assembly 5 has a laminated structure. As an example, multiple positive and negative electrode sheets can be provided, and the multiple positive and negative electrode sheets can be alternately stacked. Multiple separators can be provided and respectively disposed between any adjacent positive or negative electrode sheets. Alternatively, the separators can be provided continuously and folded between any adjacent positive or negative electrode sheets.

[0085] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0086] In some embodiments, the electrode assembly 5 is provided with tabs, which can conduct current from the electrode assembly 5. The tabs include a positive tab and a negative tab.

[0087] The battery cell 3 may include a housing 4. The housing 4 is a component that cooperates with the end cap assembly to form an internal environment for the battery cell 3. This internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure), and other components. The housing 4 can be made of steel, aluminum, plastic (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing 4), or an aluminum-plastic film. In some embodiments, the housing 4 can be a sealed or non-sealed structure. As an example, when the housing 4 is a non-sealed structure, the housing 4 protects the electrode assembly 5. A sealing bag is included between the housing 4 and the electrode assembly 5 to encapsulate the electrode assembly 5 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing 4 is a sealed structure, it is used to encapsulate the electrode assembly 5, the electrolyte, and other components.

[0088] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in this application.

[0089] The housing 4 and the end cap assembly can be separate components. One or more openings can be provided on the housing 4, and one or more end cap assemblies cover the openings to form the internal environment of the battery cell 3. Alternatively, the end cap assembly and the housing 4 can be integrated. Optionally, the end cap assembly and the housing 4 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 4 needs to be enclosed, the end cap assembly can be used to cover the housing 4.

[0090] In some embodiments, the electrode terminal 6 can be provided on the end cap assembly or on the housing 4, and the electrode terminal 6 is electrically connected to the tab. The electrode terminal 6 can be directly connected to the tab or indirectly connected to the tab through a switching mechanism.

[0091] See also Figure 5 、 Figure 6 and Figure 7 , Figure 5 is a structural schematic diagram of a battery device provided in one embodiment of the present application; Figure 6 This is a schematic structural diagram of a box body of a battery device provided in one embodiment of the present application; Figure 7 It is a partial structural diagram of a battery device provided in one embodiment of the present application.

[0092] First, as Figures 5 to 7As shown, the present application provides a battery device 2, which includes a box body 202 and a battery cell group 8. The box body 202 includes a first box wall 71 and a second box wall 72 spaced apart in a first direction X, and a receiving cavity 73 located between the first box wall 71 and the second box wall 72. The second box wall 72 includes a first area 721 and a second area 722. The distance from the first area 721 to the first box wall 71 along the first direction X is greater than the distance from the second area 722 to the first box wall 71 along the first direction X. The battery cell group 8 includes a first battery cell 81 and a second battery cell 82. The thickness direction of the first battery cell 81 is parallel to the second direction Y. The first battery cell 81 is arranged in the first area 721, and the thickness direction of the second battery cell 82 is parallel to the first direction X. The size requirement of the second battery cell 82 in the first direction X is larger than that of the second battery cell 81. The cell 82 is lower so that the second battery cell 82 can be arranged in the second area 722, thereby improving the internal space utilization of the box body 202 and improving the energy density of the battery device 2. The second box wall 72 includes a first area 721 and a second area 722 adjacent to each other in the second direction Y. The distance from the first area 721 to the first box wall 71 along the first direction X is greater than the distance from the second area 722 to the first box wall 71 along the first direction X. The battery cell group 8 is arranged in the accommodating cavity 73. The battery cell group 8 includes a first battery cell 81 and a second battery cell 82. The first battery cell 81 is arranged in the first area 721. The thickness direction of the first battery cell 81 is parallel to the second direction Y. The second battery cell 82 is arranged in the second area 722. The thickness direction of the second battery cell 82 is parallel to the first direction X. The first direction X and the second direction Y intersect.

[0093] In the embodiment of the present application, the battery device 2 includes a housing 202 and a battery cell group 8 disposed within a receiving cavity 73 of the housing 202. The housing 202 includes a first wall 71 and a second wall 72 spaced apart in a first direction X, and a receiving cavity 73 located between the first wall 71 and the second wall 72. The second wall 72 includes a first region 721 and a second region 722. The distance from the first region 721 to the first wall 71 along the first direction X is greater than the distance from the second region 722 to the first wall 71 along the first direction X. The battery cell group 8 includes a first battery cell 81 and a second battery cell 82. The thickness direction of the first battery cell 81 is parallel to the second direction Y. The first battery cell 81 is disposed in the first region 721, and the thickness direction of the second battery cell 82 is parallel to the first direction X. The size requirement of the second battery cell 82 in the first direction X is smaller than that of the second battery cell 82, so that the second battery cell 82 can be disposed in the second region 722. This improves the internal space utilization of the housing 202 and increases the energy density of the battery device 2.

[0094] Specifically, the box body 202 further includes a side plate connected between the first box wall 71 and the second box wall 72 . The first box wall 71 , the second box wall 72 and the side plate are connected to each other to enclose a receiving cavity 73 .

[0095] Optionally, the second box wall 72 includes a first area 721 and a second area 722 adjacent to each other in the second direction Y, and both the first area 721 and the second area 722 extend along the third direction Z to both ends of the second box wall 72 .

[0096] Exemplarily, the second region 722 is located between the two first regions 721 along the second direction Y. Exemplarily, the first region 721 and the second region 722 are rectangular. Optionally, the two first regions 721 have the same or different sizes.

[0097] Optionally, the box body 202 further includes a middle beam, which is disposed between the first area 721 and the second area 722 .

[0098] Optionally, a portion of the surface of the first box wall 71 facing the second area 722 protrudes toward the second box wall 72 so that the distance from the first area 721 to the first box wall 71 along the first direction X is greater than the distance from the second area 722 to the first box wall 71 along the first direction X.

[0099] In some embodiments, as Figure 5 and Figure 6 As shown, the first box wall 71 includes a planar portion 711 and a recessed portion 712 adjacent to each other in the second direction Y, the recessed portion 712 protrudes toward the accommodating cavity 73, the orthographic projection of the planar portion 711 along the first direction X is in the first area 721, and the orthographic projection of the recessed portion 712 along the first direction X is in the second area 722.

[0100] In these embodiments, the first box wall 71 is formed with a recessed portion 712 corresponding to the second area 722. Since the size requirement of the second battery cell 82 in the first direction X is low, the recessed portion 712 can protrude toward the accommodating cavity 73. When the battery device 2 is applied to an electrical device such as a vehicle 1, the recessed portion 712 helps to lower the footrest height of the driver and passengers, thereby improving the driving experience of the driver and passengers.

[0101] For example, when the battery device 2 is applied to an electrical device such as a vehicle 1, the first box wall 71 can serve as the floor of the vehicle 1, the seat can be installed on the flat portion 711, and the recessed portion 712 helps to lower the footrest height of the driver and passenger to relieve the driver and passenger's leg fatigue, thereby improving the driving experience.

[0102] For example, the recessed portion 712 may also be disposed away from the cockpit of the vehicle, and the recessed portion 712 is used to avoid other structural components.

[0103] Specifically, the recessed portion 712 forms a groove in the first box wall 71, and the surface of the recessed portion 712 facing the second box wall 72 protrudes into the accommodating cavity 73 toward the second box wall 72. The distance from the second area 722 to the first box wall 71 refers to the distance from the second area 722 to the surface of the recessed portion 712 on one side facing the accommodating cavity 73, and the distance from the first area 721 to the first box wall 71 refers to the distance from the first area 721 to the surface of the planar portion 711 on one side facing the accommodating cavity 73, so that the distance from the first area 721 to the first box wall 71 along the first direction X is greater than the distance from the second area 722 to the first box wall 71 along the first direction X.

[0104] Optionally, the battery cell group 8 includes several battery cells 3 arranged in the accommodating cavity 73, and the several battery cells 3 are divided into a first battery cell 81 and a second battery cell 82 arranged in the first area 721, that is, the size and shape of the individual first battery cell 81 and the individual second battery cell 82 are the same, and no additional mold is required, so as to reduce the processing cost of the battery cell group 8.

[0105] It should be clear that the battery cell 3 is a rectangular battery cell 3 , and the dimensions of the battery cell 3 in the length and width directions are greater than the dimension in the thickness direction.

[0106] For example, in the first battery cell 81 arranged in the first area 721, the first direction X is the width direction of the first battery cell 81, and the second direction Y is the thickness direction of the first battery cell 81; in the second battery cell 82 arranged in the second area 722, the first direction X is the thickness direction of the second battery cell 82, and the second direction Y is the width direction of the second battery cell 82.

[0107] Illustratively, the electrode terminal 6 of the first battery cell 81 extends along the first direction X, and the electrode terminal 6 of the second battery cell 82 extends along the second direction Y. Specifically, because the distance from the second region 722 to the first box wall 71 along the first direction X is smaller than the distance from the first region 721 to the first box wall 71 along the first direction X, the space between the second region 722 and the first end in the first direction X is insufficient to accommodate the first battery cell 81. Therefore, a "horizontally" positioned second battery cell 82 is provided in the second region 722. Since the second battery cell 82 extends in the first direction X in the direction of its thickness, the size requirement for the second battery cell 82 in the first direction X is low, and thus the second battery cell 82 can be accommodated in the second region 722.

[0108] Optionally, a plurality of first battery cells 81 are arranged at intervals in the first area 721 along the first direction X to increase the capacity of the battery device 2 .

[0109] Optionally, the thickness direction of the first battery cell 81 is parallel to the second direction Y. In the large-surface water-cooling solution, the current collector of the cold plate extends out of the battery cell group 8 along the third direction Z. Then, there is a gap for accommodating the current collector between the battery cell group 8 and the box wall of the box body 202 in the third direction Z. The gap can provide deformation space for the box wall when the battery device 2 is side-impacted, buffer the pressure of the box wall on the battery cell group 8, reduce the risk of damage to the battery cell group 8, and improve the reliability of the battery device 2. The first direction X, the second direction Y and the third direction Z intersect with each other.

[0110] Exemplarily, the first direction X is the height direction of the battery device 2 , the second direction Y is the length direction of the battery device 2 , and the third direction Z is the width direction of the battery device 2 .

[0111] Optionally, the plurality of second battery cells 82 are arranged in an array along the first direction X and the second direction Y to increase the capacity of the battery device 2 .

[0112] Optionally, the second area 722 may also be used to accommodate a high-voltage box and / or a battery management system to improve the utilization of the internal space of the box 202 .

[0113] See also Figure 8 , Figure 8 It is a partial structural diagram of a battery device provided in one embodiment of the present application.

[0114] In some embodiments, as Figures 6 to 8 As shown, the battery device 2 also includes a thermal management component 9, which is arranged in the accommodating cavity 73. The thermal management component 9 includes a first heat exchange mechanism 91 and a second heat exchange mechanism 92. The first heat exchange mechanism 91 is thermally connected to the first battery cell 81 along the second direction Y, and the second heat exchange mechanism 92 is thermally connected to the second battery cell 82 along the first direction X.

[0115] In these embodiments, the thermal management component 9 includes a first heat exchange mechanism 91 and a second heat exchange mechanism 92. The first heat exchange mechanism 91 is thermally connected to the first battery cell 81 along the second direction Y to adjust the temperature of the first battery cell 81. The second heat exchange mechanism 92 is thermally connected to the second battery cell 82 along the first direction X to adjust the temperature of the second battery cell 82 to improve the performance of the battery device 2.

[0116] Considering that the arrangement of the first battery cell 81 and the second battery cell 82 are different, it is necessary to adjust the arrangement of the thermal management component 9 to match the first battery cell 81 and the second battery cell 82 .

[0117] Optionally, the first heat exchange mechanism 91 and the first battery cell 81 are thermally connected, and the first heat exchange mechanism 91 and the first battery cell 81 are in direct contact or indirect contact via a heat-conducting medium, such as a heat-conducting colloid or metal. The second heat exchange mechanism 92 and the second battery cell 82 are thermally connected in a similar manner and will not be further described here.

[0118] Optionally, the battery cell 3 forms a large surface along its length and width, and the thermal management system is thermally connected to the large surface to improve thermal conductivity. In this case, the large surface of the first battery cell 81 is located on one side of the battery cell in the second direction Y, and the first heat exchange mechanism 91 is thermally connected to the first battery cell 81 along the second direction Y. The large surface of the second battery cell 82 is located on one side of the battery cell in the first direction X, and the second heat exchange mechanism 92 is thermally connected to the first battery cell 81 along the first direction X.

[0119] Exemplarily, the thickness direction of the first heat exchange mechanism 91 is the second direction Y, and the thickness direction of the second heat exchange mechanism 92 is the first direction X.

[0120] Optionally, the thermal management component 9 also includes a first external connection part and a second external connection part, the first external connection part is connected to the first heat exchange mechanism 91, the first heat exchange mechanism 91 circulates heat exchange medium between the first external connection part and the external environment, the second external connection part is connected to the second heat exchange mechanism 92, the second heat exchange mechanism 92 circulates heat exchange medium between the second external connection part and the external environment, the first external connection part and the second external connection part are independent of each other, and the first heat exchange mechanism 91 and the second heat exchange mechanism 92 are independent, so as to reduce the difficulty of setting up the thermal management component 9.

[0121] Optionally, each second battery cell 82 is located between two adjacent second heat exchange mechanisms 92 along the first direction X, so as to improve the temperature control performance of the thermal management component 9 on the second battery cells 82 .

[0122] Illustratively, the cold plate mentioned in the above embodiment may be at least one of the first heat exchange mechanism 91 and the second heat exchange mechanism 92 .

[0123] See also Figure 9 , Figure 9 It is a partial structural diagram of a battery device provided in one embodiment of the present application.

[0124] In some embodiments, as Figures 6 to 9 As shown, the battery device 2 further includes a first adhesive layer 203 , which is disposed between the second heat exchange mechanism 92 and the second box wall 72 , and the second heat exchange mechanism 92 is connected to the second box wall 72 via the first adhesive layer 203 .

[0125] In these embodiments, the second heat exchange mechanism 92 is connected to the second box wall 72 via the first adhesive layer 203 to improve the overall stability of the battery device 2 .

[0126] Optionally, the first adhesive layer 203 is a thermally conductive adhesive layer to enhance the thermal conductivity of the second heat exchange mechanism 92 .

[0127] Optionally, the battery device 2 further includes a second adhesive layer, which is disposed between the first battery cell 81 and the bottom wall along the first direction X. The first battery cell 81 is bonded to the bottom wall via the second adhesive layer to improve the stability of the battery device 2 .

[0128] Optionally, the second heat exchange mechanism 92 and the second battery cell 82 are bonded together to improve the stability of the battery device 2 .

[0129] Optionally, the first adhesive layer 203 covers the entire side surface of the second heat exchange mechanism 92 facing the bottom wall to improve the connection reliability between the second heat exchange mechanism 92 and the bottom wall.

[0130] See also Figure 10 、 Figure 11 、 Figure 12 and Figure 13 , Figure 10 This is a partial structural diagram of a battery device provided in one embodiment of the present application; Figure 11 yes Figure 10 Schematic diagram of the enlarged structure at A in the middle; Figure 12 This is a partial structural diagram of a battery device provided in one embodiment of the present application; Figure 13 yes Figure 12 Schematic diagram of the enlarged structure at point B in the middle.

[0131] In some embodiments, as Figure 6 、 Figures 10 to 12 As shown, the first heat exchange mechanism 91 includes a first main body 911 and a first current collector 912. The first main body 911 is thermally connected to the first battery cell 81 along the second direction Y. The first current collector 912 is arranged at at least one end of the first main body 911 in the third direction Z and extends out of the first battery cell 81. The second heat exchange mechanism 92 includes a second main body 921 and a second current collector 922. The second body is thermally connected to the battery cell 3 along the first direction X. The second current collector 922 is arranged at at least one end of the second main body 921 in the third direction Z and extends out of the second battery cell 82. The thermal management component 9 also includes a connecting mechanism 93. The connecting mechanism 93 is connected to the first current collector 912 and at least one second current collector 922 adjacent to each other in the second direction Y.

[0132] In these embodiments, the first current collector 912 and the second current collector 922 adjacent to each other in the second direction Y are connected by a connecting mechanism 93, so that the first heat exchange mechanism 91 and the second heat exchange mechanism 92 in the accommodating cavity 73 can be connected to each other, thereby reducing the overall size of the thermal management component 9, improving the internal space utilization of the box body 202, and improving the energy density of the battery device 2.

[0133] Specifically, the first main body portion 911 includes a first flow channel for accommodating a heat exchange medium extending along a third direction Z, and the first collector 912 includes a collecting cavity connected to the first flow channel; the second main body portion 921 includes a second flow channel for accommodating a heat exchange medium extending along a third direction Z, and the second collector 922 includes a collecting cavity connected to the second flow channel.

[0134] Optionally, a first current collector 912 is disposed at one end of the first main body 911 in the third direction Z, and the heat exchange medium is input into and output from the first main body 911 via the first current collector 912; or two first current collectors 912 are disposed at both ends of the first main body 911 in the third direction Z, and the heat exchange medium is respectively input into and output from the first main body 911 via two second current collectors 922. The second heat exchange mechanism 92 is similar and will not be described in detail here.

[0135] Optionally, the connecting mechanism 93 is connected to the adjacent first fluid collectors 912 and the second fluid collectors 922, the first fluid collectors 912 are interconnected, and the second fluid collectors 922 are interconnected. The heat exchange medium circulates between the first heat exchange mechanism 91 and the second heat exchange mechanism 92 through the connecting mechanism 93. The thermal management component 9 only needs to be provided with one of the first external connection part and the second external connection part, which helps to reduce the overall size of the thermal management component 9.

[0136] Optionally, the first current collector 912 and / or the second current collector 922 and the connecting mechanism 93 can be detachably connected to facilitate adjustment and replacement of the connecting mechanism 93 .

[0137] Optionally, the first current collector 912 and / or the second current collector 922 are interference-connected with the connecting mechanism 93 to improve the stability of the connecting mechanism 93 and reduce the risk of leakage of the thermal management component 9.

[0138] Optionally, the first current collector 912 and / or the second current collector 922 and the connection mechanism 93 may be connected in a sleeve connection, a clamping connection, or a threaded connection.

[0139] Exemplarily, the first current collector 912 and the second current collector 922 have the same shape and size, the first current collector 912 includes an opening on at least one side thereof in the second direction Y, the second current collector 922 includes an opening on at least one side thereof in the first direction X, the connecting mechanism 93 is connected to the opening of the first current collector 912 along the second direction Y, and the connecting mechanism 93 is connected to the opening of the second current collector 922 along the first direction X.

[0140] In some embodiments, as Figure 10 and Figure 11As shown, the thermal management component 9 includes at least two second heat exchange mechanisms 92 spaced apart along the first direction X, the connecting mechanism 93 includes a first connecting member 931, the first connecting member 931 includes a converging portion 9311, a collecting portion 9312 and at least two diverter portions 9313 that are interconnected, the at least two diverter portions 9313 and the at least two second current collectors 922 are arranged in one-to-one correspondence, and the converging portion 9311 and the first current collector 912 are connected.

[0141] In these embodiments, the first connecting member 931 includes a converging portion 9311, a collecting portion 9312 and at least two diverting portions 9313 that are interconnected. The converging portion 9311 is connected to the first collector 912, and the at least two diverting portions 9313 and at least two second collectors 922 are arranged in a one-to-one correspondence, so that the heat exchange medium can be distributed from the first heat exchange mechanism 91 to several second heat exchange mechanisms 92 through the first connecting member 931, so that the first heat exchange mechanism 91 and the second heat exchange mechanism 92 are smoothly connected.

[0142] Specifically, the heat exchange medium is input into the chamber of the collecting section 9312 from the converging section 9311 , and is branched from the chamber of the collecting section 9312 to each branching section 9313 , and is input into the second heat exchange mechanism 92 through the branching section 9313 .

[0143] Optionally, the confluence portion 9311 and the diversion portion 9313 both extend along the second direction Y, and the confluence portion 9311 and the diversion portion 9313 are arranged on both sides of the collecting portion 9312 along the second direction Y to reduce the overall size of the first connecting member 931 in the second direction Y.

[0144] Optionally, the confluence portion 9311 and the first current collector 912 are detachably connected. Exemplarily, the confluence portion 9311 and the first current collector 912 are sleeve-connected, snap-connected, or threadedly connected.

[0145] Optionally, the diverter portion 9313 and the second current collector 922 are detachably connected. For example, the diverter portion 9313 and the second current collector 922 are sleeved, snap-fitted, or threadedly connected.

[0146] Exemplarily, two second battery cells 82 are arranged at intervals along the first direction X, three second heat exchange mechanisms 92 are arranged at intervals along the first direction X, three diverter portions 9313 in the first connecting member 931 are arranged at intervals along the first direction X in the collecting portion 9312, and the three diverter portions 9313 and the second collectors 922 of the three second heat exchange mechanisms 92 are connected one-to-one.

[0147] Optionally, the diameter of the converging portion 9311 is larger than the diameter of the diverting portion 9313 to reduce the overall size of the first connecting member 931 .

[0148] Optionally, the connection mechanism 93 further includes a third connection member 933. The thermal management assembly 9 includes a plurality of first heat exchange mechanisms 91 spaced apart along the second direction Y. The third connection member 933 is connected between adjacent first current collectors 912 to connect adjacent first heat exchange mechanisms 91. Exemplarily, the third connection member 933 and adjacent first current collectors 912 are sleeve-connected.

[0149] In some embodiments, as Figure 10 and Figure 11 As shown, the confluence portion 9311 and the collecting portion 9312 are connected by a transition rounded corner, and / or the collecting portion 9312 and the diverter portion 9313 are connected by a transition rounded corner.

[0150] In these embodiments, the confluence portion 9311 and the collecting portion 9312 are connected with transition rounded corners, and / or the collecting portion 9312 and the diverter portion 9313 are connected with transition rounded corners to reduce the flow resistance of the heat exchange mechanism within the first connecting member 931 and improve the performance of the thermal management component 9.

[0151] Optionally, the confluence portion 9311 , the collecting portion 9312 and the diversion portion 9313 are integrally formed, which can not only improve the structural strength of the first connecting member 931 , but also reduce the risk of leakage of the first connecting member 931 .

[0152] In some embodiments, as Figures 10 to 13 As shown, the battery cell group 8 includes a plurality of second battery cells 82 spaced apart along the second direction Y, the thermal management assembly 9 includes a plurality of heat exchange groups 94 spaced apart along the second direction Y, the heat exchange group 94 includes at least two second heat exchange mechanisms 92 spaced apart along the first direction X, and two adjacent heat exchange groups 94 include two first connectors 931 disposed opposite to each other, the two confluence portions 9311 of the two first connectors 931 are connected to each other, and the respective diversion portions 9313 of the two first connectors 931 are respectively connected to the second current collectors 922 of the two heat exchange groups 94; or, the connecting mechanism 93 includes a second connector 932 extending in the second direction Y, and at least two second connectors 932 spaced apart along the first direction X are provided between the two adjacent heat exchange groups 94, and the second connector 932 is connected to the two second current collectors 922 of the two adjacent heat exchange groups 94.

[0153] In these embodiments, the battery cell group 8 includes a plurality of second battery cells 82 spaced apart along the second direction Y to increase the capacity of the battery device 2. The thermal management component 9 includes a plurality of heat exchange groups 94 spaced apart along the second direction Y to better control the temperature of the second battery cells 82. Two adjacent heat exchange groups 94 are connected through two first connectors 931 arranged opposite to each other, thereby reducing the number of molds for the thermal management component 9 and reducing the processing cost of the thermal management component 9. Alternatively, the connecting mechanism 93 includes a second connector 932 extending in the second direction Y, and the second connector 932 is connected to two second current collectors 922 of two adjacent heat exchange groups 94. At least two second connectors 932 spaced apart along the first direction X are provided between the two adjacent heat exchange groups 94. The flow resistance of the heat exchange medium in the second connector 932 is small, which helps to improve the heat exchange effect of the second heat exchange mechanism 92 and improve the performance of the battery device 2.

[0154] Specifically, the plurality of second battery cells 82 are arranged in an array along the first direction X and the second direction Y, and the corresponding plurality of second heat exchange mechanisms 92 are arranged in an array along the first direction X and the second direction Y. The second heat exchange mechanisms 92 arranged along the first direction X are regarded as a heat exchange group 94.

[0155] Specifically, the two first connecting members 931 are respectively arranged on both sides of the second heat exchange mechanism 92 of the heat exchange group 94 in the second direction Y. The first connecting member 931 located between the first heat exchange mechanism 91 and the second heat exchange mechanism 92 is connected to the adjacent first collector 912 and the second collector 922. The first connecting member 931 located between the two adjacent second heat exchange mechanisms 92 is connected between the second collector 922 and the other first connecting member 931.

[0156] Specifically, the two first connecting members 931 are arranged between two adjacent heat exchange groups 94, the confluence parts 9311 of the two first connecting members 931 are detachably connected together, and the diversion parts 9313 of the two first connecting members 931 are respectively connected to the second heat exchange mechanisms 92 of the two heat exchange groups 94.

[0157] Illustratively, the confluence portions 9311 of two adjacent first connectors 931 are sleeved or snap-connected.

[0158] Optionally, the same number of second heat exchange mechanisms 92 are set in each heat exchange group 94, and each first connecting member 931 has the same number of diversion parts 9313; or a different number of second heat exchange mechanisms 92 are set in each heat exchange group 94, and each first connecting member 931 has a different number of diversion parts 9313.

[0159] Specifically, the same number of second heat exchange mechanisms 92 are set in each heat exchange group 94, and the second connecting members 932 extend along a straight line and connect two adjacent second collectors 922. The number of second connecting members 932 is the same as the number of second heat exchange mechanisms 92 in the heat exchange group 94.

[0160] Illustratively, the second connecting member 932 is in the shape of a straight tube, and the second connecting member 932 is sleeved on the second current collector 922 .

[0161] In some embodiments, as Figure 12 and Figure 13 As shown, the second current collector 922 includes a base 9221 and a connecting portion 9222. The base 9221 is arranged at one end of the second main body 921 in the third direction Z. The connecting portion 9222 is connected to the second main body 921 through the base 9221. The connecting portion 9222 includes an opening at at least one end in the second direction Y, and the connecting mechanism 93 is connected to the opening of the connecting portion 9222 along the second direction Y.

[0162] In these embodiments, the second current collector 922 includes a base 9221 and a connecting portion 9222, the connecting portion 9222 includes an opening at at least one end in the second direction Y, and the connecting mechanism 93 is connected to the opening of the connecting portion 9222 along the second direction Y, which helps to reduce the difficulty of connecting the connecting mechanism 93 and the second heat exchange mechanism 92.

[0163] Optionally, the base 9221 and the connecting portion 9222 are integrally formed to reduce the risk of leakage of the second current collector 922 .

[0164] Optionally, the connecting portion 9222 is a pipeline extending in the second direction Y, and the connecting mechanism 93 is connected to the opening of the connecting portion 9222 along the second direction Y, thereby reducing bending of the connecting mechanism 93 and lowering the processing difficulty of the connecting mechanism 93.

[0165] Specifically, the third connecting member 933 is in communication with the opening of the communicating portion 9222 , or the diverter portion 9313 of the first connecting member 931 is in communication with the opening of the communicating portion 9222 .

[0166] Exemplarily, the connecting portion 9222 is disposed on one side of the base 9221 in the first direction X or the third direction Z, and the connecting portion 9222 extends along the second direction Y.

[0167] In some embodiments, as Figure 12 and Figure 13 As shown, the connecting portion 9222 is disposed on one side of the base 9221 in the first direction X, and is connected to the base 9221 along the first direction X.

[0168] In these embodiments, the connecting portion 9222 is arranged on one side of the base 9221 in the first direction X and is connected to the base 9221 along the first direction X to reduce the size requirement of the second heat exchange mechanism 92 in the third direction Z, which helps to improve the internal space utilization of the box 202.

[0169] Specifically, the connecting portion 9222 is disposed on one side of the base 9221 in the first direction X, and is spaced apart from the second main body 921 along the third direction Z.

[0170] The connecting portion 9222 is disposed on one side of the base 9221 in the first direction X, and the orthographic projection of the connecting portion 9222 in the first direction X is on the base 9221 .

[0171] Optionally, the heat exchange group 94 includes at least two second heat exchange mechanisms 92 spaced apart, and at least one connecting portion 9222 is located between two adjacent bases 9221 along the first direction X to fully utilize the internal space of the box 202 and improve the energy density of the battery device 2.

[0172] Optionally, the connecting portion 9222 is provided on a side of the base 9221 away from the bottom wall, so as to improve the problem of interference between the connecting portion 9222 and the bottom wall.

[0173] In a second aspect, an embodiment of the present application provides an electrical device, comprising the battery device of any embodiment of the first aspect described above.

[0174] In some embodiments, as Figures 1 to 13As shown, the battery device 2 includes a box body 202, a battery cell group 8, a thermal management component 9 and a first adhesive layer 203. The box body 202 includes a first box wall 71 and a second box wall 72 spaced apart in a first direction X, and a receiving cavity 73 located between the first box wall 71 and the second box wall 72. The second box wall 72 includes a first area 721 and a second area 722. The distance from the first area 721 to the first box wall 71 along the first direction X is greater than the distance from the second area 722 to the first box wall 71 along the first direction X. The battery cell group 8 includes a first battery cell 81 and a second battery cell 82. The thickness direction of the first battery cell 81 is parallel to the second direction Y. The first battery cell 81 is arranged in the first area 721, and the thickness direction of the second battery cell 82 is parallel to the first direction X. The size requirement of the second battery cell 82 in the first direction X is lower than that of the second battery cell 82, so that the second battery cell 82 can be arranged in the second area 722 to increase the internal space of the box body 202. The utilization rate is improved, and the energy density of the battery device 2 is improved. The first box wall 71 includes a planar portion 711 and a recessed portion 712 adjacent to each other in the second direction Y. The recessed portion 712 is protruding toward the accommodating cavity 73. The second box wall 72 includes a first area 721 and a second area 722 adjacent to each other in the second direction Y. The orthographic projection of the planar portion 711 along the first direction X is in the first area 721, and the orthographic projection of the recessed portion 712 along the first direction X is in the second area 722. The distance from the first area 721 to the first box wall 71 along the first direction X is greater than the distance from the second area 722 to the first box wall 71 along the first direction X. The battery cell group 8 is disposed in the accommodating cavity 73. The battery cell group 8 includes a first battery cell 81 and a second battery cell 82. The first battery cell 81 is disposed in the first area 721. The thickness direction of the first battery cell 81 is parallel to the second direction Y. The second battery cell 82 is disposed in the second area 722. The thickness direction of the second battery cell 82 is parallel to the first direction X.The thermal management assembly 9 is arranged in the accommodating cavity 73. The thermal management assembly 9 includes a first heat exchange mechanism 91, a second heat exchange mechanism 92 and a connecting mechanism 93. The first heat exchange mechanism 91 is thermally connected to the first battery cell 81 along the second direction Y, and the second heat exchange mechanism 92 is thermally connected to the second battery cell 82 along the first direction X. The first heat exchange mechanism 91 includes a first main body 911 and a first current collector 912. The first main body 911 is thermally connected to the first battery cell 81 along the second direction Y. The first current collector 912 is arranged on at least one of the first main body 911 in the third direction Z. end and extends from the first battery cell 81, the second heat exchange mechanism 92 includes a second main body 921 and a second current collector 922, the second main body is thermally connected to the battery cell 3 along the first direction X, the second current collector 922 is provided at least at one end of the second main body 921 in the third direction Z thereof and extends from the second battery cell 82, the connecting mechanism 93 includes a first connecting member 931, the first connecting member 931 includes a converging portion 9311, a collecting portion 9312 and at least two diverter portions 9313 that are interconnected, at least two diverter portions 9313 and at least two second current collectors 92 2 are arranged in a one-to-one correspondence, the confluence portion 9311 is connected to the first current collector 912, the battery cell group 8 includes a plurality of second battery cells 82 spaced apart along the second direction Y, the thermal management component 9 includes a plurality of heat exchange groups 94 spaced apart along the second direction Y, the heat exchange group 94 includes at least two second heat exchange mechanisms 92 spaced apart along the first direction X, and two adjacent heat exchange groups 94 include two first connecting members 931 arranged opposite to each other, the two confluence portions 9311 of the two first connecting members 931 are connected to each other, and the diversion portions 9313 of the two first connecting members 931 are respectively connected to The second current collectors 922 of the two heat exchange groups 94 are connected. The second current collectors 922 include a base 9221 and a connecting portion 9222. The base 9221 is disposed at one end of the second main body 921 in the third direction Z. The connecting portion 9222 is disposed on one side of the base 9221 in the first direction X and connects to the base 9221 along the first direction X. The connecting portion 9222 connects to the second main body 921 through the base 9221. The connecting portion 9222 includes an opening at least at one end in the second direction Y. The connecting mechanism 93 connects to the opening of the connecting portion 9222 along the second direction Y.

[0175] In these embodiments, the battery device 2 includes a housing 202 and a battery cell group 8 disposed within a receiving cavity 73 of the housing 202. The housing 202 includes a first wall 71 and a second wall 72 spaced apart in a first direction X, and a receiving cavity 73 located between the first wall 71 and the second wall 72. The second wall 72 includes a first region 721 and a second region 722. The distance from the first region 721 to the first wall 71 along the first direction X is greater than the distance from the second region 722 to the first wall 71 along the first direction X. The battery cell group 8 includes a first battery cell 81 and a second battery cell 82. The thickness direction of the first battery cell 81 is parallel to the second direction Y. The first battery cell 81 is disposed in the first region 721, and the thickness direction of the second battery cell 82 is parallel to the first direction X. The size requirement of the second battery cell 82 in the first direction X is smaller than that of the second battery cell 82, so that the second battery cell 82 can be disposed in the second region 722, thereby improving the internal space utilization of the housing 202 and improving the energy density of the battery device 2.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body includes a first box wall and a second box wall spaced apart in a first direction, and a receiving cavity located between the first box wall and the second box wall, wherein the second box wall includes a first region and a second region adjacent to each other in a second direction, wherein a distance from the first region to the first box wall along the first direction is greater than a distance from the second region to the first box wall along the first direction; A battery cell group is arranged in the accommodating cavity, and the battery cell group includes at least a first battery cell and a second battery cell, the first battery cell is arranged in the first area, the thickness direction of the first battery cell is parallel to the second direction, the second battery cell is arranged in the second area, the thickness direction of the second battery cell is parallel to the first direction, and the first direction and the second direction intersect.

2. The battery device according to claim 1, wherein: The battery device also includes a thermal management component, which is arranged in the accommodating cavity. The thermal management component includes a first heat exchange mechanism and a second heat exchange mechanism. The first heat exchange mechanism is thermally connected to the first battery cell along the second direction, and the second heat exchange mechanism is thermally connected to the second battery cell along the first direction.

3. The battery device according to claim 2, wherein: The battery device further includes a first adhesive layer, which is disposed between the second heat exchange mechanism and the second box wall. The second heat exchange mechanism is connected to the second box wall via the first adhesive layer.

4. The battery device according to claim 2 or 3, characterized in that: The first heat exchange mechanism includes a first main body and a first current collector, the first main body is thermally connected to the first battery cell along the second direction, the first current collector is arranged at at least one end of the first main body in the third direction and extends out of the first battery cell, the second heat exchange mechanism includes a second main body and a second current collector, the second main body is thermally connected to the battery cell along the first direction, the second current collector is arranged at at least one end of the second main body in the third direction and extends out of the second battery cell, and the first direction, the second direction and the third direction intersect each other. The thermal management assembly further includes a connection mechanism connected to the first current collector and at least one of the second current collectors adjacent to each other in the second direction.

5. The battery device according to claim 4, characterized in that The thermal management component includes at least two second heat exchange mechanisms spaced apart along the first direction, The connecting mechanism includes a first connecting member, which includes a converging portion, a collecting portion and at least two diverting portions that are interconnected. The at least two diverting portions and at least two second current collectors are arranged in a one-to-one correspondence, and the converging portion is connected to the first current collector.

6. The battery device according to claim 5, characterized in that The converging portion and the collecting portion are connected by a transition fillet, and / or the collecting portion and the diverting portion are connected by a transition fillet.

7. The battery device according to claim 5, characterized in that The battery cell group includes a plurality of second battery cells spaced apart along the second direction, the thermal management assembly includes a plurality of heat exchange groups spaced apart along the second direction, and the heat exchange group includes at least two second heat exchange mechanisms spaced apart along the first direction. Two adjacent heat exchange groups include two first connecting members arranged opposite to each other, the two converging parts of the two first connecting members are connected to each other, and the respective diverter parts of the two first connecting members are respectively connected to the second fluid collectors of the two heat exchange groups; Alternatively, the connecting mechanism includes a second connecting member extending in the second direction, at least two second connecting members spaced apart along the first direction are provided between two adjacent heat exchange groups, and the second connecting member is connected to two second current collectors of the two adjacent heat exchange groups.

8. The battery device according to claim 4, wherein: The second current collector includes a base and a connecting portion, the base is arranged at one end of the second main body in the third direction, the connecting portion is connected to the second main body through the base, the connecting portion includes an opening at at least one end in the second direction, and the connecting mechanism is connected to the opening of the connecting portion along the second direction.

9. The battery device according to claim 8, characterized in that The communication portion is provided on one side of the base body in the first direction and is communicated with the base body along the first direction.

10. The battery device according to claim 1, wherein: The first box wall includes a planar portion and a recessed portion adjacent to each other in the second direction, the recessed portion protrudes toward the accommodating cavity, the planar portion is projected in the first area along the first direction, and the recessed portion is projected in the second area along the first direction.

11. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 10.

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