Battery device and electric apparatus

Abstract

The present application discloses a battery device and an electric apparatus. The battery device comprises: a box body; a battery cell located in the box body, wherein the battery cell comprises a casing having an opening in a first direction and an end cap assembly covering the opening, the end cap assembly comprising a body portion and a recessed portion recessed from the body portion toward the casing; and a heat exchange member disposed on the side of the end cap assembly facing away from the casing, wherein at least part of the heat exchange member is located in the recessed portion.

Description

Battery devices and electrical appliances Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202510198651.4 entitled “Battery Device and Power Consumption Device”, filed on February 21, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of batteries, and in particular to a battery device and an electrical device. Background Technology

[0003] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0004] However, as the energy density of battery devices continues to increase, the amount of heat generated during battery use is also increasing, and current cooling solutions for battery devices cannot meet the safety requirements of battery devices. Summary of the Invention

[0005] In view of the above problems, this application provides a battery device and an electrical device that can improve the safety performance of the battery device.

[0006] In a first aspect, this application provides a battery device, comprising: a housing; a battery cell located in the housing, the battery cell including a shell having an opening in a first direction and an end cap assembly covering the opening, the end cap assembly including a body portion and a recess recessed from the body portion toward the shell; and a heat exchange component disposed on the side of the end cap assembly away from the shell, with at least a portion of the heat exchange component located in the recess.

[0007] In the embodiments of this application, the battery device includes a housing, battery cells located within the housing, and a heat exchange component. The battery cell includes a casing and an end cap assembly. The casing houses electrode components, and the end cap assembly can accommodate electrode terminals and other components. The end cap assembly has a recess, and at least a portion of the heat exchange component is located within the recess. The recess provides restraint for the heat exchange component and also reduces the distance between the heat exchange component and the electrode assembly, improving heat exchange efficiency and thus enhancing the safety performance of the battery device.

[0008] In some embodiments, a plurality of battery cells are arranged side by side along a second direction, and the recesses of the plurality of battery cells are interconnected to form a clearance space. A heat exchange component is arranged in the clearance space corresponding to the plurality of battery cells, and the second direction intersects the first direction.

[0009] In these embodiments, the recesses of multiple battery cells are interconnected, and the heat exchange component is provided for multiple battery cells, which simplifies the arrangement of the heat exchange component and allows the same heat exchange component to provide heat exchange to multiple battery cells.

[0010] In some embodiments, the body portion is provided with electrode terminals, and the battery cell further includes an electrode assembly located within the housing. The electrode assembly includes an electrode body and tabs extending from the electrode body toward the end cap assembly. At least a portion of the tabs are located within the body portion and are electrically connected to the electrode terminals.

[0011] In these embodiments, the recess is recessed relative to the body portion toward the electrode assembly, and therefore the body portion protrudes relative to the recess in a direction away from the electrode assembly. By placing the tab within the protruding body portion, the space occupied by the tab can be reduced, greatly improving the utilization rate and structure of the internal space of the battery cell.

[0012] In some embodiments, two body portions are located on both sides of the recess in a third direction, and the first direction and the third direction intersect; two electrode tabs are provided on the side of the electrode body facing the end cap assembly, which are spaced apart along the third direction, and at least a portion of each electrode tab is located in each body portion.

[0013] In these embodiments, the electrode assembly typically has two tabs, and the body portion has two tabs, such that each tab can be located within the body portion. Furthermore, the two body portions can provide opposing limiting forces to the heat exchange component located within the recess, further improving the stability of the relative position between the heat exchange component and the battery cell, thereby enhancing the heat exchange effect and the safety performance of the battery device.

[0014] In some embodiments, the height of the body portion protruding from the recess in the first direction is 8mm to 10mm.

[0015] In these embodiments, when the height of the body portion relative to the recess is within the above-mentioned range, it can both improve the problem that the height of the body portion is too small to properly accommodate the tabs, resulting in low space utilization, and improve the problem that the height of the body portion is too large, resulting in wasted space.

[0016] In some embodiments, at least a portion of the surface of the electrode body facing the end cap assembly is in contact with the recess.

[0017] In these embodiments, the electrode assembly serves as the primary heat-generating component of the battery device. The surface of the electrode assembly and the recessed portion are in contact, which reduces the distance between the electrode assembly and the heat exchange components, thereby improving heat exchange efficiency and the safety performance of the battery device. Furthermore, the recessed portion also provides restraint for the electrode assembly, ensuring the stability of the relative position between the electrode assembly and the end cap assembly.

[0018] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on the end cap assembly, or the pressure relief mechanism is disposed on the housing and located on the side of the housing opposite to the end cap assembly.

[0019] In these embodiments, by providing a pressure relief mechanism on the battery cell, when the electrode assembly heats up and generates a large amount of gas, causing the pressure inside the casing to become too high, the pressure relief mechanism can be opened to allow the hot gas to be discharged in time, thereby improving the safety performance of the battery cell.

[0020] In some embodiments, the pressure relief mechanism is disposed in the recess of the end cap assembly, and the heat exchange component includes a through-hole, wherein the projection of the first clearance hole along a first direction and the projection of the pressure relief mechanism along the first direction at least partially overlap.

[0021] In these embodiments, the pressure relief mechanism is disposed in the recess, and the pressure relief mechanism and the heat exchange component overlap. The heat exchange component has a first clearance hole, and the projection of the first clearance hole and the pressure relief mechanism along the first direction at least partially overlaps, so that at least part of the pressure relief mechanism can be exposed through the first clearance hole, and the gas discharged by the pressure relief mechanism can be discharged through the first clearance hole.

[0022] In some embodiments, a first heat insulation layer is coated around the periphery of the first clearance hole, and the minimum distance between the first heat insulation layer and the outer boundary of the first clearance hole is greater than or equal to 30 mm.

[0023] In these embodiments, a first heat insulation layer is provided around the first clearance hole. When gas is discharged from the first clearance hole, it can improve the damage of high-temperature hot gas to the heat exchange component. The outer boundary of the first heat insulation layer is greater than or equal to 30 mm from the boundary of the first clearance hole, so that the coating area of ​​the first heat insulation layer is large enough to achieve a better heat insulation effect.

[0024] In some embodiments, the pressure relief mechanism is disposed on the housing and located on the side of the housing away from the end cover assembly, and the support plate is supported on the side of the housing away from the end cover assembly; the housing is also provided with a support plate, and the support plate is provided with a support portion facing the inner wall of the housing to form an exhaust channel between the support plate and the inner wall of the housing, and a second clearance hole is provided on the support plate, and the projection of the second clearance hole along the first direction and the projection of the pressure relief mechanism along the first direction at least partially overlap.

[0025] In these embodiments, the pressure relief mechanism is located on the side of the housing away from the end cover assembly, i.e., the heat exchange component and the pressure relief mechanism are located on opposite sides of the battery cell. This increases the distance between the heat exchange component and the pressure relief mechanism, improving their mutual influence. A support plate is provided at the bottom of the housing, and a support part is provided on the side of the support plate away from the motor assembly. Through the support part, an exhaust channel can be formed between the support plate and the inner wall of the housing, allowing the gas discharged by the pressure relief mechanism to be discharged through the second clearance hole and the exhaust channel.

[0026] In some embodiments, at least two supports are spaced apart on both sides of the same pressure relief mechanism.

[0027] In these embodiments, the same pressure relief mechanism is provided with two support parts, and the two support parts are located on both sides of the same pressure relief mechanism. An exhaust channel can be formed between the two support parts. The exhaust channel is connected to the pressure relief mechanism, which facilitates the rapid discharge of gas through the exhaust channel.

[0028] In some embodiments, a second heat insulation layer is coated around the second clearance hole, and the minimum distance between the second heat insulation layer and the outer boundary of the second clearance hole is greater than or equal to 30 mm.

[0029] In these embodiments, a second heat insulation layer is provided around the second clearance hole. When gas is discharged from the second clearance hole, it can improve the damage to the high-temperature hot gas support plate. The outer boundary of the second heat insulation layer is greater than or equal to 30 mm from the boundary of the second clearance hole, so that the coating area of ​​the second heat insulation layer is large enough to achieve a better heat insulation effect.

[0030] In some embodiments, a busbar assembly is provided inside the housing, and the busbar assembly is electrically connected to the battery cell. The surface of the busbar assembly facing away from the main body and the surface of the heat exchange component facing away from the housing are flush.

[0031] In these embodiments, a busbar assembly is provided on the main body, which can directly abut against the inner wall of the housing. The surface of the heat exchange component away from the housing and the surface of the busbar assembly away from the main body are flush, which can improve the flatness of the surface between the heat exchange component and the busbar assembly, so that the heat exchange component can also abut against the inner wall of the housing. The housing can provide a limit to the heat exchange component, further improving the stability of the relative position between the heat exchange component and the battery cell.

[0032] In some embodiments, a current-combining assembly is provided inside the housing, and the current-combining assembly is electrically connected to a battery cell. A buffer component is provided on the side of the current-combining assembly away from the housing, and the current-combining assembly abuts against the buffer component.

[0033] In these embodiments, the body is provided with a bus assembly and a buffer component. The buffer component can provide buffer protection to the body and the bus assembly, thereby improving the deformation problem of the body.

[0034] In some embodiments, the surface of the buffer component facing away from the end cap assembly and the surface of the heat exchange component facing away from the end cap assembly are flush.

[0035] In these embodiments, the buffer component can directly abut against the inner wall surface of the housing, and the surface of the heat exchange component facing away from the housing and the surface of the buffer component facing away from the housing are flush, which can improve the flatness of the surface between the heat exchange component and the buffer component, so that the heat exchange component can also abut against the inner wall surface of the housing. The housing can provide a limit to the heat exchange component, further improving the stability of the relative position between the heat exchange component and the battery cell.

[0036] In some embodiments, the housing includes a bottom and sides that are welded together.

[0037] In these embodiments, the bottom and sides of the housing are welded together instead of bolted together, which improves the utilization of space inside the housing and reduces the manufacturing cost of the battery device.

[0038] In some embodiments, the heat exchange component includes a heat exchange section and a support structure stacked along a first direction, the heat exchange section having a medium receiving cavity, and the support structure including support ribs extending along the first direction.

[0039] In these embodiments, the medium receiving cavity can contain the heat exchange medium, and the support ribs of the support structure can improve the structural strength and rigidity of the heat exchange component, making the heat exchange component less prone to deformation and improving the service life of the heat exchange component.

[0040] Secondly, embodiments of this application provide an electrical device, including the battery device described in the first aspect embodiment. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0042] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0043] Figure 2 is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0044] Figure 3 is an exploded view of a single battery cell provided in an embodiment of this application;

[0045] Figure 4 is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0046] Figure 5 is a schematic diagram of the structure of a battery device provided in another embodiment of this application;

[0047] Figure 6 is a top view of a battery device provided in an embodiment of this application;

[0048] Figure 7 is a cross-sectional view at point AA in Figure 6;

[0049] Figure 8 is a partially enlarged structural schematic diagram of Figure 7;

[0050] Figure 9 is a schematic diagram of the structure of a battery device provided in another embodiment of this application;

[0051] Figure 10 is a top view of a battery device provided in another embodiment of this application;

[0052] Figure 11 is a cross-sectional view at point BB in Figure 10;

[0053] Figure 12 is a partially enlarged structural diagram of Figure 11.

[0054] 10. Vehicle; 110. Motor; 120. Controller; 20. Battery unit; 201. Battery pack; 202. Housing; 2021. First housing; 2022. Second housing; 30. Battery cell; 40. Heat exchange component; 401. First clearance hole; 402. Medium receiving cavity; 410. Heat exchange section; 420. Support structure; 421. Support rib; 50. Buffer component;

[0055] 1. Housing; 11. Receiving cavity; 12. Opening; 13. End cap assembly; 131. Body part; 132. Recess; 133. Electrode terminal;

[0056] 2. Electrode assembly; 21. Electrode body; 22. Tab;

[0057] 3. Pressure relief mechanism;

[0058] 4. Support plate; 41. Second clearance hole; 42. Support part;

[0059] 5. Busbar components;

[0060] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0061] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0062] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0063] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0064] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0068] Battery devices include individual battery cells, which release a lot of heat during use. In the event of a violent impact or other accident, the individual battery cell may even experience thermal runaway or explosion. Current cooling solutions for battery devices cannot meet the safety requirements of battery devices.

[0069] Based on the above problems, this application provides a battery device, which includes a housing and battery cells and heat exchange components located inside the housing. The battery cell includes a shell and an end cap assembly. The end cap assembly is recessed towards the shell to form a recess. At least part of the heat exchange component is located in the recess, which can reduce the distance between the heat exchange component and the electrode assembly inside the shell, reduce the heat exchange distance, improve the heat dissipation effect, and thus improve the safety performance of the battery device.

[0070] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0071] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0072] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0073] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0074] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0075] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0076] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0077] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 10 provided in some embodiments of this application. The vehicle 10 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 20 is provided inside the vehicle 10, and the battery device 20 can be located at the bottom, front, or rear of the vehicle 10. The battery device 20 can be used to power the vehicle 10; for example, the battery device 20 can serve as the operating power source for the vehicle 10. The vehicle 10 may also include a controller 120 and a motor 110. The controller 120 is used to control the battery to supply power to the motor 110, for example, to meet the power needs of the vehicle 10 during starting, navigation, and driving.

[0078] In some embodiments of this application, the battery device 20 can not only serve as the operating power source for the vehicle 10, but also as the driving power source for the vehicle 10, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10.

[0079] Figure 2 shows a schematic diagram of the structure of a battery device 20 according to an embodiment of this application. Figure 3 is an exploded view of a single battery cell 30. The battery device 20 includes a housing 202 and a battery pack 201 located within the housing 202, the battery pack 201 containing a plurality of battery cells 30.

[0080] Please refer to Figures 4 to 8 together. In a first aspect, this application provides a battery device 20, which includes: a housing 202; a battery cell 30 located in the housing 202, the battery cell 30 including a housing 1 having an opening 12 in a first direction X and an end cap assembly 13 covering the opening 12, the end cap assembly 13 including a body portion 131 and a recess 132 recessed from the body portion 131 toward the housing 1; and a heat exchange component 40 disposed on the side of the end cap assembly 13 away from the housing 1, and at least a portion of the heat exchange component 40 is located in the recess 132.

[0081] In this embodiment of the application, the battery device 20 includes a housing 202, battery cells 30 located within the housing 202, and a heat exchange component 40. The battery cell 30 includes a casing 1 and an end cap assembly 13. The casing 1 accommodates an electrode assembly 2, and the end cap assembly 13 can house components such as electrode terminals 133. The end cap assembly 13 has a recess 132, and at least a portion of the heat exchange component 40 is located within the recess 132. The recess 132 provides a limiting position for the heat exchange component 40 and also reduces the distance between the heat exchange component 40 and the electrode assembly 2, improving the heat exchange effect and thus enhancing the safety performance of the battery device 20.

[0082] In some embodiments, as shown in FIG2, the housing 202 includes a first housing 2021 and a second housing 2022.

[0083] In some embodiments, the battery device 20 may be a battery pack, which includes a housing 202 and one or more battery cells 30, the battery cells 30 being housed in the housing 202.

[0084] As an example, multiple battery cells 30 can be directly fixed to the housing 202 and housed in the housing 202.

[0085] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together to form a closed space inside the housing 202 to house the battery pack 201. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 2021 may be a top cover or a bottom wall.

[0086] Optionally, multiple individual battery cells 30 can be directly installed inside the housing 202 without forming a battery pack 201.

[0087] Optionally, there can be multiple battery cells 30, and multiple battery cells 30 arranged side by side along the second direction Y can form a battery pack 201. There can also be multiple battery packs 201, and multiple battery packs 201 can be arranged side by side along the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other, for example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0088] Optionally, the heat exchange component 40 is provided with a medium receiving cavity 402 to receive the heat exchange medium. The heat exchange component 40 may also include a liquid inlet communicating with the medium receiving cavity 402, so that the heat exchange medium can enter the medium receiving cavity 402 through the liquid inlet and flow out through the liquid outlet. Optionally, the heat exchange medium can be water, and the heat exchange component 40 can be a water-cooled plate. The material of the heat exchange component 40 can be a high thermal conductivity material such as copper to further improve the heat exchange efficiency. In some embodiments, a plurality of battery cells 30 are arranged side by side along the second direction Y, and the recesses 132 of the plurality of battery cells 30 are interconnected to form a clearance space. The heat exchange component 40 is arranged in the clearance space corresponding to the plurality of battery cells 30, and the second direction Y intersects the first direction X.

[0089] In these embodiments, the recesses 132 of the multiple battery cells 30 are interconnected, and the heat exchange component 40 is provided for the multiple battery cells 30, which simplifies the arrangement of the heat exchange component 40 and allows the same heat exchange component 40 to provide heat exchange to multiple battery cells 30.

[0090] Optionally, as described above, multiple battery cells 30 are arranged side-by-side along the second direction Y to form a battery pack 201. The same battery pack 201 can correspond to the same heat exchange component 40, and multiple battery packs 201 can correspond to multiple heat exchange components 40. The liquid inlet and liquid outlet of the heat exchange component 40 can be located on at least one side of the heat exchange component 40 in the second direction Y. For example, having the liquid inlet and liquid outlet on the same side of the heat exchange component 40 in the second direction Y simplifies the structure of the heat exchange component 40.

[0091] In some embodiments, as shown in Figures 4 to 12, an electrode terminal 133 is provided on the body portion 131, and the battery cell 30 further includes an electrode assembly 2 located in the housing 1. The electrode assembly 2 includes an electrode body 21 and a tab 22 extending from the electrode body 21 toward the end cap assembly 13. At least a portion of the tab 22 is located in the body portion 131 and is electrically connected to the electrode terminal 133.

[0092] In these embodiments, the recess 132 is recessed relative to the body portion 131 toward the electrode assembly 2, so the body portion 131 protrudes relative to the recess 132 in a direction away from the electrode assembly 2. By placing the tab 22 within the protruding body portion 131, the space occupied by the tab 22 can be reduced, greatly improving the utilization rate and structure of the internal space of the battery cell 30.

[0093] Optionally, the body portion 131 protrudes from the recess 132, and a receiving space is formed within the body portion 131 on one side of the recess 132. The electrode tab 22 protrudes from the electrode body 21, and can be completely hidden within the body portion 131 to further improve space utilization. The body portion 131 includes a sidewall facing the recess 132, and the electrode tab 22 and the heat exchange component 40 are isolated from each other by the sidewall.

[0094] The electrode assembly 2 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0095] In some embodiments, the electrode assembly 2 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0096] In some embodiments, the electrode assembly 2 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0097] In some embodiments, the electrode assembly 2 may be cylindrical, flat, or polygonal, etc.

[0098] In some embodiments, the electrode assembly 2 is provided with tabs 22, which can conduct current from the electrode assembly 2. The tabs 22 include a positive tab 22 and a negative tab 22.

[0099] The battery cell 30 may include a housing 1. The housing 1 is an assembly used to cooperate with the end cap assembly 13 to form the internal environment of the battery cell 30. The internal environment formed by the receiving cavity 11 of the housing 1 can be used to house the electrode assembly 2, electrolyte (not shown in the figure), and other components. The housing 1 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 1), or an aluminum-plastic film, etc. In some embodiments, the housing 1 can be a sealed structure or a non-sealed structure. As an example, when the housing 1 is a non-sealed structure, the housing 1 serves to protect the electrode assembly 2, and a sealing bag is also included between the housing 1 and the electrode assembly 2. The sealing bag is used to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film. When the housing 1 is a sealed structure, it is used to encapsulate the electrode assembly 2 and electrolyte, etc.

[0100] As an example, the battery cell 30 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0101] The housing 1 and the end cap assembly 13 can be independent components. One or more openings 12 can be provided on the housing 1, and one or more end cap assemblies 13 can close the openings 12 to form the internal environment of the battery cell 30. Optionally, the end cap assembly 13 and the housing 1 can also be integrated. Optionally, the end cap assembly 13 and the housing 1 can form a common connection surface before other components are inserted into the housing, and the end cap assembly 13 closes the housing 1 when it is necessary to encapsulate the interior of the housing 1.

[0102] In some embodiments, the electrode terminal 133 can be directly connected to the tab 22, or it can be indirectly connected to the tab 22 through an adapter mechanism. The body portion 131 can be used directly as the electrode terminal 133, or the electrode terminal 133 can be provided on the body portion 131.

[0103] In some embodiments, two body portions 131 are located on both sides of the recess 132 in the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other; the electrode body 21 is provided with two tabs 22 distributed at intervals along the third direction Z on the side facing the end cap assembly 13, and at least a portion of each tab 22 is located in each body portion 131.

[0104] In these embodiments, the electrode assembly 2 is typically provided with two tabs 22, and the body portion 131 is provided with two tabs, such that each tab 22 can be located within the body portion 131. Furthermore, the two body portions 131 can provide opposing limiting forces to the heat exchange component 40 located within the recess 132, further improving the stability of the relative position between the heat exchange component 40 and the battery cell 30, thereby improving the heat exchange effect and the safety performance of the battery device 20.

[0105] Optionally, the two body portions 131 located on both sides of the recess 132 are exactly the same size, so that the recess 132 is centered in the third direction Z relative to the battery cell 30, and the heat exchange component 40 can provide better heat exchange to the battery cell 30. Moreover, the heat exchange component 40 not only has a heat dissipation function, but also a heat equalization function, so that the temperature of different positions of the battery cell 30 is close.

[0106] Optionally, heat is more likely to concentrate at the connection point between the tab 22 and the electrode terminal 133. In this embodiment, the tab 22 and the heat exchange component 40 are located on the same side of the electrode assembly 2 in the first direction X, which can effectively shorten the heat conduction path, improve cooling efficiency and the safety performance of the battery device 20.

[0107] In some embodiments, as shown in FIG8, the height H of the body portion 131 protruding from the recess 132 in the first direction X is 8mm to 10mm.

[0108] In these embodiments, when the height H of the body portion 131 relative to the recess 132 is within the above-mentioned range, it can improve the problem that the height of the body portion 131 is too small to properly accommodate the tab 22, resulting in low space utilization; it can also improve the problem that the height of the body portion 131 is too large, resulting in wasted space.

[0109] The height H of the main body 131 relative to the recess 132 is the distance between the surface of the main body 131 away from the shell 1 and the bottom surface of the recess 132.

[0110] In some embodiments, as shown in Figures 8 and 12, at least a portion of the surface of the electrode body 21 facing the end cap assembly 13 is in contact with the recess 132.

[0111] In these embodiments, the electrode assembly 2 serves as the main heat-generating component of the battery device 20. The surface of the electrode assembly 2 is in contact with the recess 132, which reduces the distance between the electrode assembly 2 and the heat exchange component 40, thereby improving the heat exchange effect and the safety performance of the battery device 20. In addition, the recess 132 can also provide a limit for the electrode assembly 2, ensuring the stability of the relative position between the electrode assembly 2 and the end cap assembly 13.

[0112] Optionally, the heat exchange component 40 is in contact with the recess 132 within the recess 132 to further reduce the distance between the heat exchange component 40 and the electrode assembly 2, shorten the heat conduction path, and improve the heat dissipation effect.

[0113] In some embodiments, as shown in Figures 8 and 12, the battery cell 30 further includes a pressure relief mechanism 3, which is disposed on the end cap assembly 13, or the pressure relief mechanism 3 is disposed on the housing 1 and located on the side of the housing 1 opposite to the end cap assembly 13.

[0114] In these embodiments, by providing a pressure relief mechanism 3 on the battery cell 30, when the electrode assembly 2 generates a large amount of gas and the pressure inside the casing 1 becomes too high, the pressure relief mechanism 3 can be opened to allow the hot gas to be discharged in time, thereby improving the safety performance of the battery cell 30.

[0115] Optionally, the pressure relief mechanism 3 can be an explosion-proof valve. The pressure relief mechanism 3 is disposed on the housing 1 or the end cap assembly 13, and is configured to open when the pressure inside the housing 1 exceeds a preset value, so that the gas inside the housing 1 can be discharged through the pressure relief mechanism 3.

[0116] In some embodiments, as shown in Figures 4 to 8, the pressure relief mechanism 3 is disposed in the recess 132 of the end cap assembly 13, and the heat exchange component 40 includes a through-hole 401, the projection of the first clearance hole 401 along the first direction X and the projection of the pressure relief mechanism 3 along the first direction X at least partially overlap.

[0117] In these embodiments, the pressure relief mechanism 3 is disposed in the recess 132, and the pressure relief mechanism 3 overlaps with the heat exchange component 40. The heat exchange component 40 has a first clearance hole 401, and the projection of the first clearance hole 401 and the pressure relief mechanism 3 along the first direction X at least partially overlaps, so that at least part of the pressure relief mechanism 3 can be exposed through the first clearance hole 401, and the gas discharged by the pressure relief mechanism 3 can be discharged through the first clearance hole 401.

[0118] Optionally, when the heat exchange component 40 is configured to correspond to multiple battery cells 30, the number of first clearance holes 401 is multiple, and the multiple first clearance holes 401 are spaced apart along the second direction Y. Each first clearance hole 401 is configured to correspond to the pressure relief mechanism 3 of each battery cell 30.

[0119] Optionally, the heat exchange component 40 may include two medium receiving cavities 402, which are respectively disposed on both sides of the first clearance hole 401 in the third direction Z to improve the heat uniformity of the heat exchange component 40. Of the two medium receiving cavities 402 located on both sides of the first clearance hole 401, one is connected to the liquid inlet and the other is connected to the liquid outlet. The two medium receiving cavities 402 can be interconnected on one side of the heat exchange component 40 in the second direction Y, allowing the heat exchange medium to flow between the two medium receiving cavities 402. Alternatively, both medium receiving cavities 402 may be connected to both the liquid inlet and the liquid outlet, allowing the two medium receiving cavities 402 to independently transfer the heat exchange medium.

[0120] In some embodiments, a first heat insulation layer (not shown in the figure) is coated around the first clearance hole 401, and the minimum distance from the outer boundary of the first heat insulation layer to the first clearance hole 401 is greater than or equal to 30 mm.

[0121] In these embodiments, a first heat insulation layer is provided around the first clearance hole 401. When gas is discharged from the first clearance hole 401, it can improve the damage of high-temperature hot gas to the heat exchange component 40. The outer boundary of the first heat insulation layer is greater than or equal to 30 mm from the boundary of the first clearance hole 401, so that the coating area of ​​the first heat insulation layer is large enough to achieve a better heat insulation effect.

[0122] Optionally, in the embodiment where the heat exchange component 40 and the pressure relief mechanism 3 are located on the same side of the battery cell 30, the battery device 20 can be an inverted battery device 20. That is, when the battery device 20 is used in the vehicle 10, the electrode terminal 133 of the battery cell 30 and the heat exchange component 40 can be located on the side of the battery cell 30 facing the ground, and the bottom of the housing 202 is suspended above the vehicle 10, so that the gas discharged by the pressure relief mechanism 3 is discharged towards the ground, thereby improving the impact of hot gas on the safety of the vehicle 10.

[0123] In some embodiments, as shown in Figures 9 to 12, the pressure relief mechanism 3 is disposed on the housing 1 and located on the side of the housing 1 away from the end cap assembly 13; a support plate 4 is also disposed inside the housing 202, and a support portion 42 is disposed on the support plate 4 facing the inner wall of the housing 202 to form an exhaust channel between the support plate 4 and the inner wall of the housing 202, and a second clearance hole 41 is provided on the support plate 4.

[0124] In these embodiments, the pressure relief mechanism 3 is located on the side of the housing 1 away from the end cap assembly 13, that is, the heat exchange component 40 and the pressure relief mechanism 3 are located on opposite sides of the battery cell 30, which can increase the distance between the heat exchange component 40 and the pressure relief mechanism 3 and improve the mutual influence between the heat exchange component 40 and the pressure relief mechanism 3. A support plate 4 is provided at the bottom of the housing 202, and a support part 42 is provided on the side of the support plate 4 away from the motor assembly. Through the support of the support part 42, an exhaust channel can be formed between the support plate 4 and the inner wall of the housing 202, and the gas discharged by the pressure relief mechanism 3 can be discharged through the second clearance hole 41 and the exhaust channel.

[0125] Optionally, in the embodiment where the heat exchange component 40 and the pressure relief mechanism 3 are located on different sides of the battery cell 30, the battery device 20 can be a positively positioned battery device 20. That is, when the battery device 20 is used in the vehicle 10, the pressure relief mechanism 3 of the battery cell 30 faces the ground, and the end cap assembly 13 of the battery cell 30 is positioned close to the vehicle 10, so that the pressure relief mechanism 3 can discharge gas towards the ground, thereby improving the safety performance of the vehicle 10.

[0126] In some embodiments, as shown in FIG12, at least two support portions 42 are spaced apart on both sides of the same pressure relief mechanism 3.

[0127] In these embodiments, the same pressure relief mechanism 3 is provided with two support parts 42, and the two support parts 42 are respectively located on both sides of the same pressure relief mechanism 3. An exhaust channel can be formed between the two support parts 42. The exhaust channel is connected to the pressure relief mechanism 3, so that the gas can be quickly discharged from the exhaust channel.

[0128] Optionally, as described above, when multiple battery cells 30 are arranged side-by-side along the second direction Y to form a battery pack 201, the same support plate 4 can be provided corresponding to the same battery pack 201, the support portion 42 extends along the second direction Y, and two support portions 42 are spaced apart along the third direction Z on both sides of the pressure relief mechanism 3. Alternatively, in some other embodiments, the support plate 4 can be provided corresponding to multiple battery packs 201, the support portion 42 extends along the second direction Y, and two support portions 42 are spaced apart along the third direction Z on both sides of the pressure relief mechanism 3.

[0129] In some embodiments, a second heat insulation layer is coated around the second clearance hole 41, and the minimum distance between the second heat insulation layer and the outer boundary of the second clearance hole 41 is greater than or equal to 30 mm.

[0130] In these embodiments, a second heat insulation layer is provided around the second clearance hole 41. When gas is discharged from the second clearance hole 41, it can improve the damage to the high-temperature hot gas support plate 4. The outer boundary of the second heat insulation layer is greater than or equal to 30 mm from the boundary of the second clearance hole 41, so that the coating area of ​​the second heat insulation layer is large enough to achieve a better heat insulation effect.

[0131] In some embodiments, as shown in FIG12, a busbar assembly 5 is also provided inside the housing 202. The busbar assembly 5 is electrically connected to the battery cell 30. The busbar assembly 5 abuts against the inner wall of the housing 202. The surface of the busbar assembly away from the main body 131 is flush with the surface of the heat exchange component 40 away from the housing 1.

[0132] In these embodiments, the busbar assembly 5 on the main body 131 can directly abut against the inner wall surface of the housing 202. The surface of the heat exchange component 40 away from the housing 1 and the surface of the busbar assembly 5 away from the main body 131 are flush, which can improve the flatness of the surface between the heat exchange component 40 and the busbar assembly 5, so that the heat exchange component 40 can also abut against the inner wall surface of the housing 202. The housing 202 can provide a limit for the heat exchange component 40, further improving the stability of the relative position between the heat exchange component 40 and the battery cell 30.

[0133] In a battery device 20 where the junction assembly and the inner wall of the housing 202 abut against each other, the above-mentioned upright battery device 20 can be used. The main body 131 and the junction assembly are located on the side of the battery device 20 facing the vehicle 10. The side where the main body 131 and the junction assembly are located is not easily scratched, so the junction assembly and the inner wall of the housing 202 can be directly connected.

[0134] In some embodiments, as shown in FIG8, a current-combining assembly 5 is also provided inside the housing 202. The current-combining assembly 5 is electrically connected to the battery cell 30. A buffer member 50 is provided on the side of the current-combining assembly 5 away from the main body 131. The current-combining assembly 5 abuts against the inner wall of the housing 202 through the buffer member 50.

[0135] In these embodiments, a buffer member 50 is provided on the busbar assembly 5. The buffer member 50 can provide buffer protection for the busbar assembly 5 and the main body 131, and improve the deformation problem of the busbar assembly 5 and the main body 131. The battery device 20 with the buffer member 50 provided on the busbar assembly 5 and the main body 131 can be the inverted battery device 20 described above, with the end cap assembly 13 facing the ground. By providing the buffer member 50 on the main body 131 and the busbar assembly 5, the problem of damage caused by foreign objects on the ground scratching the battery device 20 can be improved.

[0136] In some embodiments, the surface of the buffer member 50 facing away from the end cap assembly 13 and the surface of the heat exchange member 40 facing away from the end cap assembly 13 are flush.

[0137] In these embodiments, the buffer component 50 can directly abut against the inner wall surface of the housing 202, and the surface of the heat exchange component 40 facing away from the housing 1 and the surface of the buffer component 50 facing away from the housing 1 are flush, which can improve the flatness of the surface between the heat exchange component 40 and the buffer component 50, so that the heat exchange component 40 can also abut against the inner wall surface of the housing 202. The housing 202 can provide a limit for the heat exchange component 40, further improving the stability of the relative position between the heat exchange component 40 and the battery cell 30.

[0138] Optionally, the material of the buffer component 50 can be foam, rubber, etc., so that the buffer component 50 has good elasticity and improves the shock resistance of the battery device 20.

[0139] In some embodiments, the housing 202 includes a bottom and sides that are welded together.

[0140] In these embodiments, the bottom and sides of the housing 202 are welded together instead of bolted together, which can improve the utilization of the internal space of the housing 202 and reduce the manufacturing cost of the battery device 20.

[0141] In some embodiments, the heat exchange component 40 includes a heat exchange portion 410 and a support structure 420 stacked along a first direction X. The heat exchange portion 410 has a medium receiving cavity 402, and the support structure 420 includes support ribs 421 extending along the first direction X. The medium receiving cavity 402 can contain the heat exchange medium, and the support ribs 421 of the support structure 420 can improve the structural strength and rigidity of the heat exchange component 40, making the heat exchange component 40 less prone to deformation and improving its service life.

[0142] Optionally, there can be multiple support ribs 421, which are distributed at intervals along the second direction Y and / or the third direction Z to further improve the structural strength and rigidity of the heat exchange component 40. Optionally, cavities can be provided inside the support ribs 421 to increase the volume of the support ribs 421 and improve the structural strength and rigidity of the heat exchange component 40.

[0143] Optionally, the heat exchange section 410 is located on the side of the support structure 420 closer to the battery cell 30, so as to reduce the distance between the heat exchange section 410 and the battery cell 30 and improve the heat exchange effect.

[0144] Optionally, the housing 202 can be made of extruded aluminum alloy to improve its structural strength. Optionally, the bottom and side walls can be joined by friction stir welding to improve the structural strength of the bottom and sides, and enhance the strength and durability of the joint.

[0145] Secondly, embodiments of this application provide an electrical device, including the battery device 20 described in the first aspect embodiment above.

[0146] Please refer to Figures 4 to 12. This application embodiment provides a battery device 20, including: a housing 202; battery cells 30 located in the housing 202, each battery cell 30 including a shell 1 having an opening 12 in a first direction X and an end cap assembly 13 covering the opening 12, the end cap assembly 13 including a body portion 131 and a recess 132 recessed from the body portion 131 toward the shell 1; and a heat exchange component 40 disposed on the side of the end cap assembly 13 away from the shell 1, with at least a portion of the heat exchange component 40 located in the recess 132. Multiple battery cells 30 are arranged side-by-side along a second direction Y, the recesses 132 of the multiple battery cells 30 communicating with each other to form a clearance space, and the heat exchange component 40 is disposed in the clearance space corresponding to the multiple battery cells 30. The second direction Y intersects the first direction X. The main body 131 is provided with electrode terminals 133. The battery cell 30 also includes an electrode assembly 2 located within the housing 1. The electrode assembly 2 includes an electrode body 21 and tabs 22 extending from the electrode body 21 toward the top cover. At least a portion of the tabs 22 is located within the main body 131 and is electrically connected to the electrode terminals 133. Two main bodies 131 are located on either side of the recess 132 in the third direction Z, where the first direction X, the second direction Y, and the third direction Z intersect each other. Two tabs 22 are provided on the side of the electrode body 21 facing the end cover assembly 13, spaced apart along the third direction Z. At least a portion of each tab 22 is located within its respective main body 131. In the first direction X, the height of the main body 131 protruding from the recess 132 is 8mm to 10mm. At least a portion of the surface of the electrode body 21 facing the end cover assembly 13 is in contact with the recess 132.

[0147] In some embodiments, as shown in Figures 5 to 8, the pressure relief mechanism 3 is disposed in the recess 132 of the end cap assembly 13, and the heat exchange component 40 includes a through-hole 401, the projection of the first clearance hole 401 along the first direction X and the projection of the pressure relief mechanism 3 along the first direction X at least partially overlap. A buffer component 50 is disposed on the side of the body portion 131 opposite to the housing 1, and the body portion 131 abuts against the inner wall of the housing 202 through the buffer component 50. The surface of the buffer component 50 opposite to the end cap assembly 13 is flush with the surface of the heat exchange component 40 opposite to the end cap assembly 13.

[0148] In other embodiments, as shown in Figures 9 to 12, the pressure relief mechanism 3 is disposed on the housing 1 and located on the side of the housing 1 opposite to the end cap assembly 13; a support plate 4 is also disposed inside the housing 202, and the support plate 4 has a support portion 42 disposed towards the inner wall of the housing 202 to form an exhaust channel between the support plate 4 and the inner wall of the housing 202, and a second clearance hole 41 is provided on the support plate 4. At least two support portions 42 are distributed at intervals on both sides of the same pressure relief mechanism 3. The body portion 131 abuts against the inner wall of the housing 202, and the surface of the body portion 131 opposite to the housing 1 is flush with the surface of the heat exchange component 40 opposite to the housing 1.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising: Box; A battery cell is located in the housing. The battery cell includes a housing having an opening in a first direction and an end cap assembly that covers the opening. The end cap assembly includes a body portion and a recess that is recessed from the body portion toward the housing. A heat exchange component is disposed on the side of the end cap assembly opposite to the housing, and at least a portion of the heat exchange component is located in the recess.

2. The battery device according to claim 1, wherein, Multiple battery cells are arranged side by side along a second direction, and the recesses of the multiple battery cells are interconnected to form a clearance space. The heat exchange component is arranged in the clearance space corresponding to the multiple battery cells, and the second direction intersects the first direction.

3. The battery device according to claim 1, wherein, The main body is provided with electrode terminals, and the battery cell also includes an electrode assembly located within the housing. The electrode assembly includes an electrode body and tabs extending from the electrode body toward the end cap assembly. At least a portion of the tabs are located within the main body and are electrically connected to the electrode terminals.

4. The battery device according to claim 3, wherein, The two body portions are located on both sides of the recess in a third direction, and the first direction and the third direction intersect. The electrode body has two tabs spaced apart along the third direction on the side facing the end cap assembly, and at least a portion of each tab is located within the body portion.

5. The battery device according to claim 3, wherein, In the first direction, the height of the body portion protruding from the recess is 8mm to 10mm.

6. The battery device according to claim 3, wherein, At least a portion of the surface of the electrode body facing the end cap assembly is in contact with the recess.

7. The battery device according to claim 1, wherein, The battery cell also includes a pressure relief mechanism, which is disposed on the end cap assembly, or the pressure relief mechanism is disposed on the housing and located on the side of the housing opposite to the end cap assembly.

8. The battery device according to claim 7, wherein, The pressure relief mechanism is disposed in the recess of the end cap assembly, and the heat exchange component includes a through-hole. The projection of the first clearance hole along the first direction and the projection of the pressure relief mechanism along the first direction at least partially overlap.

9. The battery device according to claim 8, wherein, The periphery of the first clearance hole is coated with a first heat insulation layer, and the minimum distance from the outer boundary of the first heat insulation layer to the first clearance hole is greater than or equal to 30 mm.

10. The battery device according to claim 7, wherein, The pressure relief mechanism is disposed on the housing and located on the side of the housing opposite to the end cap assembly; The housing is also provided with a support plate, which is supported on the side of the housing away from the end cap assembly. The side of the support plate facing the inner wall of the housing is provided with a support part to form an exhaust channel between the support plate and the inner wall of the housing. The support plate is provided with a second clearance hole, and the projection of the second clearance hole along the first direction and the projection of the pressure relief mechanism along the first direction at least partially overlap.

11. The battery device according to claim 10, wherein, At least two of the support portions are spaced apart on both sides of the same pressure relief mechanism.

12. The battery device according to claim 11, wherein, The second clearance hole is coated with a second heat insulation layer, and the minimum distance between the second heat insulation layer and the outer boundary of the second clearance hole is greater than or equal to 30 mm.

13. The battery device according to claim 1, wherein, The housing is equipped with a current-combining assembly, which is electrically connected to the battery cell. The surface of the current-combining assembly facing away from the main body is flush with the surface of the heat exchange component facing away from the housing.

14. The battery device according to claim 1, wherein, The housing contains a current-combining assembly, which is electrically connected to the battery cell. A buffer component is provided on the side of the current-combining assembly facing away from the housing, and the current-combining assembly abuts against the inner wall of the housing through the buffer component.

15. The battery device according to claim 14, wherein, The surface of the buffer component facing away from the end cap assembly is flush with the surface of the heat exchange component facing away from the end cap assembly.

16. The battery device according to claim 1, wherein, The enclosure includes a bottom and sides that are welded together.

17. The battery device according to claim 1, wherein, The heat exchange component includes a heat exchange section and a support structure stacked along the first direction. The heat exchange section has a medium receiving cavity, and the support structure includes support ribs extending along the first direction.

18. An electrical device comprising the battery device according to any one of claims 1-17.

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