Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a box assembly, a battery monomer assembly, a thermal management assembly and a limiting beam assembly. The box assembly comprises a first box and a second box arranged along a first direction, and the first box and the second box are connected to each other and form a cavity. The battery monomer assembly is located in the cavity, and comprises a plurality of battery monomers stacked along a second direction. The thermal management assembly is arranged between the battery monomer assembly and the second box. The limiting beam assembly is arranged at both ends of the battery monomer assembly along the second direction. The limiting beam assembly is fixedly connected to the first box. Along the first direction, one end of the battery monomer is adhesively connected to the first box, and the other end is adhesively connected to the thermal management assembly. The first direction and the second direction are arranged in an intersecting manner. The application can improve the reliability of the battery device.

Description

Technical Field

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

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have become increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.

[0003] In the development of battery technology, improving the reliability of battery devices is a key research direction. Utility Model Content

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

[0005] In a first aspect, embodiments of this application provide a battery device, which includes a housing assembly, a battery cell assembly, a thermal management assembly, and a limiting beam assembly. The housing assembly includes a first housing and a second housing arranged along a first direction, which are connected to each other to form a cavity. The battery cell assembly is located within the cavity and includes a plurality of battery cells stacked along a second direction. The thermal management assembly is disposed between the battery cell assembly and the second housing. Limiting beam assemblies are provided at both ends of the battery cell assembly along the second direction. The limiting beam assembly is fixedly connected to the first housing, and along the first direction, one end of the battery cell is bonded to the first housing, and the other end is bonded to the thermal management assembly. The first direction and the second direction are intersecting.

[0006] In the above scheme, by placing the thermal management component between the battery cell assembly and the second housing, heat exchange can be achieved for the battery cell assembly. By installing limiting beam assemblies at both ends of the battery cell assembly along the second direction, expansion of the battery cell along the second direction can be suppressed, reducing the risk of battery cell deformation. By fixing the limiting beam assemblies to the first housing, space can be provided for the pipelines used to transfer the heat exchange medium to the thermal management component without interference, facilitating the installation of the thermal management component. By bonding the battery cell to both ends along the first direction of the first housing and the thermal management component respectively, the integration of the battery device can be improved, the overall rigidity of the battery device can be enhanced, making the battery device more stable during transportation and operation, thereby improving the reliability of the battery device.

[0007] In some embodiments, the battery device includes a plurality of battery cell assemblies arranged along a third direction; the thermal management assembly includes a current collector and a plurality of heat exchangers connected to the current collector, the plurality of heat exchangers being spaced apart along the third direction, the plurality of heat exchangers including two end heat exchangers and at least one intermediate heat exchanger; along the third direction, the intermediate heat exchanger is located between the two end heat exchangers, wherein the two end heat exchangers are fixedly connected to a second housing; the third direction is respectively intersecting with the first direction and the second direction.

[0008] In the above scheme, the intermediate heat exchanger and two end heat exchangers arranged along a third direction can simultaneously exchange heat for multiple battery cells, increasing the heat exchange area of ​​the thermal management components and improving the heat exchange effect. The two end heat exchangers are fixedly connected to the second housing, further improving the integration of the battery device and its reliability.

[0009] In some embodiments, the second housing includes a bottom plate and a side enclosure disposed along the periphery of the bottom plate. The bottom plate is formed with a boss portion and a recessed portion. The boss portion protrudes toward the cavity relative to the recessed portion. An end heat exchanger is connected to the boss portion. A bottom support portion is provided on the side of the boss portion away from the end heat exchanger. The battery device also includes a mounting assembly for mounting on an external structure. The bottom support portion extends to the mounting assembly.

[0010] In the above design, the recessed section provides installation space for the internal structure of the battery device, reducing interference. Furthermore, by placing the base below the boss and extending it directly to the mounting assembly, the structural strength of the battery device can be improved.

[0011] In some embodiments, the end heat exchanger includes a heat exchange shell and a partition rib. An end heat exchange channel is formed inside the heat exchange shell, and the partition rib is located inside the end heat exchange channel. The end heat exchange channel is divided into multiple end heat exchange sub-channels by the partition rib.

[0012] In the above scheme, the design of the heat exchange shell and the partition ribs can not only strengthen the support of the end heat exchange components for the battery cell assembly, but also increase the flow channels of the heat exchange medium, thereby improving the heat exchange efficiency.

[0013] In some embodiments, the end heat exchanger is a one-piece molded structure.

[0014] In the above scheme, the one-piece molded structure can improve the structural integrity and mechanical strength of the end heat exchange components, enhance sealing performance, and reduce the risk of leakage of heat exchange medium.

[0015] In some embodiments, a first buffer is provided between the end heat exchanger and the boss portion, and the first buffer connects the boss portion and the end heat exchanger respectively.

[0016] In the above solution, by setting a first buffer between the end heat exchanger and the boss, the battery cell above the end buffer can be buffered, thus protecting the battery cell.

[0017] In some embodiments, the battery device includes a plurality of battery cell assemblies arranged along a third direction; the thermal management assembly includes a current collector and a plurality of heat exchangers connected to the current collector, the current collector extending along the third direction, the heat exchangers extending along a second direction, and the heat exchangers including two end heat exchangers and at least one intermediate heat exchanger; along the third direction, the intermediate heat exchanger is located between the two end heat exchangers; wherein the intermediate heat exchanger is heat-exchangingly connected to two adjacent battery cell assemblies; the third direction is respectively intersecting the first direction and the second direction.

[0018] In the above scheme, the heat exchange efficiency of the thermal management component can be improved by connecting the intermediate heat exchange component with the two adjacent battery cell modules.

[0019] In some embodiments, the battery cell includes a housing and electrode terminals, the electrode terminals being disposed on the side of the housing facing the second housing, and the electrode terminals being disposed between adjacent intermediate heat exchangers; along a first direction, a second buffer is disposed between the intermediate heat exchanger and the second housing.

[0020] In the above scheme, by placing the electrode terminals between adjacent intermediate heat exchange components, the space utilization rate inside the battery device can be improved, thereby increasing the energy density of the battery device.

[0021] In some embodiments, both the limiting beam assembly and the first housing are made of metal, and the limiting beam assembly is welded to the first housing; or, the limiting beam assembly is made of metal, the first housing is made of non-metal, and the limiting beam assembly is bonded to the first housing or connected by fasteners.

[0022] In the above scheme, the limiting beam assembly and the first box are connected by welding, and the limiting beam assembly and the first box are connected by bonding or fasteners, which can increase the stability of the connection between the limiting beam assembly and the first box.

[0023] In some embodiments, the limiting beam assembly includes a limiting beam and an extension plate, the extension plate being connected to the limiting beam, and at least a portion of the extension plate being located between the battery cell and the first housing, the extension plate being adhesively connected to the first housing.

[0024] In the above solution, the connection area between the limiting beam and the first box body is increased by connecting the limiting beam assembly and the first box body through the extension plate, thereby improving the connection stability between the limiting beam assembly and the first box body.

[0025] In some embodiments, the first housing is provided with a recessed platform and a cell bonding surface. The recessed platform protrudes from the side of the cell bonding surface facing away from the second housing. An extension plate is disposed in the recessed platform, and the surface of the extension plate facing away from the first housing is flush with the cell bonding surface.

[0026] In the above scheme, by setting it flush with the battery cells, the extension plate will not occupy the placement space of the battery cells and will not affect the energy density of the battery device.

[0027] In some embodiments, the limiting beam assembly includes a first end and a second end disposed opposite to each other, the first end being fixed to a first housing; and the width of the first end being greater than the width of the second end along a second direction.

[0028] In the above scheme, by setting the width of the first end to be greater than the width of the second end, the connection area between the limiting beam assembly and the first box body can be increased, thereby improving the connection stability between the limiting beam assembly and the first box body.

[0029] In some embodiments, the limiting beam assembly includes a first plate and a second plate. The first plate includes a first connecting portion and a first bent portion and a second bent portion connected to the first connecting portion. The first bent portion is located at a first end, and the second bent portion is located at a second end. The second plate includes a second connecting portion and a third bent portion and a fourth bent portion connected to the second connecting portion. The third bent portion is located at the first end, and the fourth bent portion is located at the second end. Along a first direction, the first bent portion and the third bent portion do not overlap, and the second bent portion and the fourth bent portion at least partially overlap.

[0030] In the above scheme, by ensuring that the first bend and the third bend do not overlap, and that the second bend and the fourth bend at least partially overlap, it is easy to make the width of the first end greater than the width of the second end.

[0031] In some embodiments, the limiting beam assembly further includes a reinforcing plate, which includes a plurality of reinforcing segments and connecting segments located between the first plate and the second plate. The connecting segments and connecting segments are alternately arranged along a first direction. The reinforcing segments are disposed between the first connecting portion and the second connecting portion, and the connecting segments are fixed to the first connecting portion or the second connecting portion.

[0032] In the above scheme, the structural strength of the limiting beam assembly can be increased by setting up the reinforcing plate.

[0033] In some embodiments, the reinforcing plate further includes a fifth bend, which is connected to the reinforcing section. The fifth bend is disposed on the side of the first bend facing the first housing and is connected to the first housing.

[0034] In the above solution, by bending the fifth bend to one side of the first bend and connecting it with the first box body, the connection strength between the limiting beam assembly and the first box body can be further increased.

[0035] In some embodiments, the first connecting portion is provided with a first groove recessed toward the second connecting portion; and / or, the second connecting portion is provided with a second groove recessed toward the first connecting portion.

[0036] In the above scheme, the first groove can increase the structural strength of the first plate; and / or, the second groove can increase the structural strength of the second plate.

[0037] In some embodiments, the battery device further includes an output electrode and an output electrode base connected to the output electrode. The output electrode is connected to one of the battery cells. A mounting hole is provided near the second end of the limiting beam, and the output electrode base is disposed in the mounting hole.

[0038] In the above solution, by installing the output electrode base in the mounting hole in the limiting beam, the internal space of the battery device can be saved and the energy density of the battery device can be increased.

[0039] In some embodiments, the battery device includes a plurality of battery cell assemblies arranged along a third direction; the thermal management assembly includes a current collector and a plurality of heat exchangers connected to the current collector, the plurality of heat exchangers being spaced apart along a third direction, the heat exchangers including two end heat exchangers and at least one intermediate heat exchanger; along the third direction, the intermediate heat exchanger is located between the two end heat exchangers, wherein the current collector includes a first flow channel and a second flow channel arranged adjacent to each other, the intermediate heat exchanger includes an inlet flow channel and an outlet flow channel, the flow direction of the heat exchange medium in the inlet flow channel is away from the current collector, the flow direction of the heat exchange medium in the outlet flow channel is towards the current collector, the inlet flow channel is connected to the first flow channel, and the outlet flow channel is connected to the second flow channel.

[0040] In the above scheme, the current collector integrates the adjacent first and second flow channels to handle the liquid supply and return of multiple intermediate heat exchangers. This eliminates the need to design separate external liquid inlet and return pipelines for each intermediate heat exchanger. Furthermore, the adjacent arrangement of the first and second flow channels improves the integration of the thermal management components, simplifies the structure, and enhances the energy density of the battery device.

[0041] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy.

[0042] The electrical device provided in this application embodiment has the same technical effect as the battery provided in the above embodiment, and will not be described again here. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 Exploded views of battery devices according to some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application; Figure 4 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 5 This is an exploded view of a battery device according to some embodiments of this application; Figure 6 This is a top view of a thermal management component according to some embodiments of this application; Figure 7 This is a cross-sectional schematic diagram of a battery device according to some embodiments of this application; Figure 8 yes Figure 7 Enlarged diagram of section A in the middle; Figure 9 This is a cross-sectional schematic diagram of the end heat exchanger according to some embodiments of this application; Figure 10 This is a partial cross-sectional schematic diagram of a battery device according to some embodiments of this application; Figure 11 This is a partially exploded schematic diagram of a battery device according to some embodiments of this application; Figure 12 This is another partial cross-sectional schematic diagram of a battery device according to some embodiments of this application; Figure 13 This is a structural schematic diagram of the limiting beam assembly according to some embodiments of this application; Figure 14 This is a partial structural schematic diagram of the limiting beam assembly according to some embodiments of this application; Figure 15 This is a partially exploded schematic diagram of the thermal management components of some embodiments of this application.

[0045] Explanation of reference numerals in the attached figures: 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, First Housing; 11, Recessed Platform; 12, Cell Bonding Surface; 30, Second Housing; 31, Base Plate; 311, Boss; 312, Recessed Tank; 313, Base Support; 32, Side Panel; 400, Battery Module; 20, Battery Cell; 21, End Cap; 22, Housing; 23, Electrode Assembly; 24, Outer Shell; 26, Electrode Terminal; 40, Battery Cell Assembly; 50, Thermal Management Assembly; 51, Current Collector; 511, First Flow Channel; 512, Second Flow Channel; 52, Heat Exchanger; 521, End Heat Exchanger; 522, Intermediate Heat Exchanger; 5221, Inlet Flow Channel; 5222, Outlet Flow Channel; 523 524. Heat exchange shell; 525. Separating rib; 526. End heat exchange channel; 527. End heat exchange sub-channel; 60. Limiting beam assembly; 61. Limiting beam; 62. Extension plate; 63. First end; 64. Second end; 65. First plate; 651. First connecting part; 652. First bending part; 653. Second bending part; 654. First groove; 66. Second plate; 661. Second connecting part; 662. Third bending part; 663. Fourth bending part; 67. Reinforcing plate; 671. Reinforcing section; 672. Connecting section; 673. Fifth bending part; 68. Mounting hole; 70. Mounting assembly; 81. First buffer; 82. Second buffer; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0046] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0048] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0049] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0050] In this application, "multiple" means two or more (including two).

[0051] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0052] The battery mentioned in the embodiments of this application may be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0053] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0054] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0055] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0056] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0057] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0058] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0059] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0060] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of silver-treated stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0062] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

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

[0064] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-surfaced stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0066] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0067] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0068] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0069] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0070] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0071] In some embodiments, the electrode assembly further includes a separator disposed between the positive and negative electrodes. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0072] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0073] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0074] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0075] In some implementations, the electrode assembly is a stacked structure.

[0076] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0077] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0078] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0079] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0080] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0081] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0082] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0083] The battery device has many internal structures, and the assembly of these structures can easily cause interference, making installation difficult and reducing the reliability of the battery device.

[0084] To address the aforementioned technical problems, this application provides a battery cell. By placing a thermal management component between the battery cell assembly and a second housing, heat exchange can be achieved between the battery cell assembly and the second housing. By providing limiting beam assemblies at both ends of the battery cell assembly along the second direction, expansion of the battery cell along the second direction can be suppressed, reducing the risk of battery cell deformation. By fixing the limiting beam assemblies to the first housing, space can be provided for pipelines transporting the heat exchange medium to the thermal management component without interference, facilitating the installation of the thermal management component. By bonding the battery cell to both ends along the first direction of the first housing and the thermal management component respectively, the integration of the battery device can be improved, making the battery device more stable during transportation and operation, thereby enhancing the reliability of the battery device.

[0085] The technical solutions described in the embodiments of this application are applicable to electrode assemblies, battery cells including electrode elements, batteries including battery cells, and electrical devices using batteries.

[0086] 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.

[0087] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0088] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0089] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 , Figure 2This is an exploded view of the apparatus provided in some embodiments of this application. The battery device 100 includes a battery housing and a battery cell 20. In some embodiments, the battery housing may include a first housing 10 and a second housing 30, which overlap each other, and together define a receiving cavity for accommodating the battery cell 20. The second housing 30 may be a hollow structure with one open end, and the first housing 10 may be a plate-like structure, with the first housing 10 covering the open side of the second housing 30 so that the first housing 10 and the second housing 30 together define the receiving cavity; the first housing 10 and the second housing 30 may also both be hollow structures with one open side, with the open side of the first housing 10 covering the open side of the second housing 30. Of course, the battery housing formed by the first housing 10 and the second housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0091] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application. In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in a housing. Of course, the battery device 100 can also be in the form of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module 400, and then multiple battery modules 400 are connected in series, parallel, or in a mixed manner to form a whole and housed in a housing. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0092] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0093] Figure 4This is an exploded structural diagram of a battery cell according to some embodiments of this application. The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit it. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is less prone to deformation under pressure and impact, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 26 can be provided on the end cap 21. The electrode terminals 26 can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0094] Figure 5 This is an exploded view of a battery device according to some embodiments of this application.

[0095] like Figure 5 As shown, in a first aspect, embodiments of this application provide a battery device 100, which includes a housing assembly, a battery cell assembly 40, a thermal management assembly 50, and a limiting beam assembly 60. The housing assembly includes a first housing 10 and a second housing 30 arranged along a first direction X, which are interconnected to form a cavity. The battery cell assembly 40 is located within the cavity and includes a plurality of battery cells 20 stacked along a second direction Y. The thermal management assembly 50 is disposed between the battery cell assembly 40 and the second housing 30. Limiting beam assemblies 60 are provided at both ends of the battery cell assembly 40 along the second direction Y. The limiting beam assembly 60 is fixedly connected to the first housing 10. Along the first direction X, one end of the battery cell 20 is bonded to the first housing 10, and the other end is bonded to the thermal management assembly 50. The first direction X and the second direction Y are intersecting.

[0096] The first direction X can be the height direction of the battery cell 20, and the second direction Y can be the thickness direction of the battery cell 20.

[0097] The first housing 10 can be the upper housing, and the second housing 30 can be the lower housing. The first housing 10 and the second housing 30 are interlocked to form a closed cavity for accommodating the battery cell 20. The first housing 10 and the second housing 30 can be connected by bolts, snap-fitting, welding, adhesive, or other methods.

[0098] There can be one or more battery cell modules 40, for example, multiple battery cell modules 40 are arranged sequentially along the second direction Y.

[0099] The thermal management component 50 is used for heat exchange of the battery cell 20. The thermal management component 50 has heat exchange channels through which a heat exchange medium flows. The heat exchange medium can include ethylene glycol, water, or silicone oil, etc. Depending on the ambient temperature, the heat exchange medium can be used to cool or heat the battery cell 20. For example, when the vehicle is traveling at high speed (1000 km / h) or the battery device is charging and discharging at a high rate (100 km / h), the battery cell 20 generates a large amount of heat. The low-temperature heat exchange medium circulates in the heat exchange channels, transferring the heat away, which can, to some extent, prevent the battery cell 20 from overheating, thereby extending the lifespan of the battery cell 20. When the ambient temperature is very low, the battery cell 20 can be heated using a heated heat exchange medium to ensure that the battery cell 20 operates at a suitable temperature.

[0100] During charging and discharging, the expansion of the battery cell 20 along the second direction Y is greater than that along the first direction X and the third direction Z. Therefore, the battery cell assembly 40 is positioned between two limiting beam assemblies 60 spaced apart along the second direction Y, providing bidirectional constraint in the direction of the largest expansion of the battery cell assembly 40.

[0101] The two ends of the battery cell assembly 40 along the first direction X can be bonded to the first housing 10 and the thermal management assembly 50 respectively using adhesive. When installing the battery device 100, the thermal management assembly 50 can be placed inside the second housing 30 first, and then the battery cell assembly 40 can be placed on the thermal management assembly 50 and bonded to it; the limiting beam assembly 60 can be fixedly connected to the first housing 10 in advance, and then the first housing 10 and the limiting beam assembly 60 can be connected to the second housing 30 as a whole.

[0102] Because the thermal management component 50 requires connecting pipes to transport the heat exchange medium in order to achieve the flow and circulation of the heat exchange medium, if the limiting beam assembly 60 is fixed to the second housing 30, it will interfere with the pipes connected to the thermal management component 50, making it inconvenient to install the battery device 100.

[0103] In the above scheme, by placing the thermal management component 50 between the battery cell assembly 40 and the second housing 30, heat exchange can be performed on the battery cell assembly 40. By setting the limiting beam assemblies 60 at both ends of the battery cell assembly 40 along the second direction Y, the expansion of the battery cell 20 along the second direction Y can be suppressed, reducing the risk of deformation of the battery cell 20. By fixing the limiting beam assemblies 60 to the first housing 10, space can be provided for the pipeline used to transfer the heat exchange medium to the thermal management component 50 without interference, facilitating the installation of the thermal management component 50. By bonding the two ends of the battery cell 20 along the first direction X to the first housing 10 and the thermal management component 50 respectively, the integration of the battery device 100 can be improved, making the battery device 100 more stable during transportation and operation, thereby improving the reliability of the battery device 100.

[0104] Figure 6 This is a top view of a thermal management component according to some embodiments of this application; Figure 7 This is a cross-sectional schematic diagram of a battery device according to some embodiments of this application.

[0105] Please refer to the following: Figure 6 and Figure 7 In some embodiments, the battery device 100 includes a plurality of battery cell assemblies 40 arranged along a third direction Z; the thermal management assembly 50 includes a current collector 51 and a plurality of heat exchangers 52 connected to the current collector 51, the plurality of heat exchangers 52 being spaced apart along the third direction Z, the plurality of heat exchangers 52 including two end heat exchangers 521 and at least one intermediate heat exchanger 522; along the third direction Z, the intermediate heat exchanger 522 is located between the two end heat exchangers 521, wherein the two end heat exchangers 521 are fixedly connected to the second housing 30; the third direction Z intersects with the first direction X and the second direction Y respectively.

[0106] The battery device 100 includes more than one battery cell assembly 40, which are arranged sequentially along the third direction Z. Because the capacity of a single battery cell assembly 40 is limited, arranging multiple battery cell assemblies 40 along the third direction Z can further increase the total voltage and total capacity of the entire battery device 100 through series connection of the battery cells, thus meeting the high power and long range requirements of electrical devices such as new energy vehicles.

[0107] The heat exchange elements 52 of the thermal management assembly 50 are divided into three categories according to their arrangement along the third direction Z. The end heat exchange element 521 at one end is the outermost first heat exchange element 52 arranged along the third direction Z, for example, the leftmost one. The end heat exchange element 521 at the other end is the outermost last heat exchange element 52 arranged along the third direction Z, for example, the rightmost one.

[0108] The intermediate heat exchanger 522 is located between the two end heat exchangers 521, and the number of intermediate heat exchangers 522 can be one or more.

[0109] The end heat exchanger 521 can be fixedly connected to the second housing 30 along the first direction X and facing the second housing 30 by means of adhesive, bolts or other structures.

[0110] The intermediate heat exchanger 522 and the end heat exchanger 521, with their ends near the collector 51, can be located on the same side of the collector 51 and fixed to it. The intermediate heat exchanger 522 and the end heat exchanger 521 can be connected to the collector 51 by welding, snap-fitting, bonding, or other methods.

[0111] The end heat exchange channel 525 in the end heat exchanger 521 can be connected in series with the intermediate heat exchange channel in the intermediate heat exchanger 522, and the intermediate heat exchange channels of multiple intermediate heat exchangers 522 can be connected in parallel.

[0112] In the above scheme, the intermediate heat exchanger 522 and the two end heat exchangers 521 arranged along the third direction Z can simultaneously exchange heat for multiple battery cell modules 40, thereby increasing the heat exchange area of ​​the thermal management component 50 and improving the heat exchange effect. The two end heat exchangers 521 are fixedly connected to the second housing 30, which further improves the integration of the battery device 100 and enhances its reliability.

[0113] Optionally, the two ends of the heat exchanger 52 along the second direction Y can be connected to the limiting beam assemblies 60 at both ends by means of bolts, adhesives, welding, etc., to enhance the stability of the heat exchanger 52.

[0114] Figure 7 This is a cross-sectional schematic diagram of a battery device according to some embodiments of this application; Figure 8 yes Figure 7 Enlarged schematic diagram of part A in the middle.

[0115] Please refer to the following: Figure 7 and Figure 8 In some embodiments, the second housing 30 includes a bottom plate 31 and a side panel 32 disposed along the periphery of the bottom plate 31. The bottom plate 31 has a boss portion 311 and a recess portion 312. The boss portion 311 protrudes towards the cavity relative to the recess portion 312. The end heat exchange member 521 is connected to the boss portion 311. The side of the boss portion 311 away from the end heat exchange member 521 is provided with a bottom support portion 313. The battery device 100 also includes a mounting assembly 70 for mounting on an external structure. The bottom support portion 313 extends to the mounting assembly 70.

[0116] The base plate 31 is the main load-bearing plate at the bottom of the second housing 30, bearing the weight of all the internal battery cells 20, thermal management components 50, etc. The side panel 32 is a fence-like structure extending upward from the edge of the base plate 31, integrally formed or welded with the base plate 31, together forming a pallet-like structure to accommodate all internal components.

[0117] The base plate 31 is not a flat plane, but is die-cast or stamped into a shape with varying heights. The bosses 311 are areas on the base plate 31 that bulge upwards, acting like platforms or pillars, and are closer to the internal cavity of the housing. Because of their protrusion, the bosses 311 have higher structural strength than the flat base plate 31, and can withstand greater forces and moments. The end heat exchangers 521 of the thermal management assembly 50 are fixedly mounted on these bosses 311, providing a stable base for the end heat exchangers 521.

[0118] The recessed portion 312 is the opposite of the boss portion 311; it is a partially recessed area of ​​the base plate 31. The recessed portion 312 provides space for other components inside the battery device 100 (such as wiring harnesses, pipes, electrode terminals 26, etc.), preventing them from interfering with the base plate 31 and facilitating installation and maintenance.

[0119] The bottom support 313 is located on the side of the boss 311 away from the inside of the housing, that is, below the boss 311 and outside the second housing 30. When a force from above (from the end heat exchanger 521, battery module, etc.) acts on the boss 311, this force is directly transmitted to the bottom support 313. It is equivalent to adding reinforcing ribs at the key stress points of the bottom plate 31, enhancing the rigidity of the bottom and its impact and vibration resistance.

[0120] The mounting assembly 70 is a structure that connects the battery pack to external equipment (such as the chassis of an electric vehicle or the bracket of an energy storage system), and may include mounting brackets, bolt connection points, etc.

[0121] The bottom support 313, which bears the main load inside the battery device 100, has its force path directly and seamlessly guided to the mounting assembly 70, forming a force transmission path from the internal load, end heat exchange component 521, boss 311, bottom support 313, mounting assembly 70 to the external vehicle body. This avoids the force being dispersed and transmitted through the thin integral bottom plate 31 to a certain extent, thereby reducing the risk of structural deformation and fatigue damage.

[0122] In the above solution, the recessed section 312 can provide installation space for the structure inside the battery device 100, reducing interference. Furthermore, by placing the base support 313 below the boss section 311 and extending the base support 313 directly to the mounting assembly 70, the structural strength of the battery device 100 can be improved.

[0123] Figure 9This is a cross-sectional schematic diagram of the end heat exchanger of some embodiments of this application.

[0124] like Figure 9 As shown, in some embodiments, the end heat exchanger 521 includes a heat exchange shell 523 and a partition rib 524. An end heat exchange channel 525 is formed inside the heat exchange shell 523, and the partition rib 524 is located inside the end heat exchange channel 525. The end heat exchange channel 525 is divided into multiple end heat exchange sub-channels 526 by the partition rib 524.

[0125] The heat exchange shell 523 can be a one-piece structure prepared by extrusion or by injection molding. The partition ribs 524 extend along the second direction Y, and the end heat exchange sub-channels 526 also extend along the second direction Y. Multiple partition ribs 524 can be spaced apart along the third direction Z, and multiple end heat exchange sub-channels 526 are arranged sequentially along the third direction Z. The flow direction of the heat exchange medium in the multiple end heat exchange sub-channels 526 of each end heat exchange component 521 is the same, all being unidirectional channels. The flow directions of the heat exchange medium in the two end heat exchange components 521 can be opposite.

[0126] The arrangement of the heat exchange shell 515 and the partition ribs 516 makes the end heat exchange component 521 resemble a harmonica tube, and multiple end heat exchange sub-channels 526 can simultaneously flow heat exchange medium, increasing the flow rate of heat exchange medium in the end heat exchange component 521.

[0127] In the above scheme, the design of heat exchange shell 523 and partition rib 524 can not only strengthen the support of end heat exchange component 521 for battery cell assembly 40, but also increase the flow channel of heat exchange medium, thereby improving heat exchange efficiency.

[0128] In some embodiments, the end heat exchanger 521 is an integrally formed structure.

[0129] The end heat exchanger 521 is manufactured as a complete component through a one-time manufacturing process (such as aluminum extrusion molding, precision casting, or integral machining). Its internal flow channels (such as multiple end heat exchanger sub-channels 526) are formed synchronously with the external structure during the molding process, rather than by splicing and welding multiple parts. The one-piece molding structure means that there are no internal welds or splicing interfaces, making the component itself a completely sealed whole.

[0130] In the above scheme, the one-piece molded structure can improve the structural integrity and mechanical strength of the end heat exchange component 521, improve the sealing performance, and reduce the risk of leakage of the heat exchange medium.

[0131] In some embodiments, a first buffer 81 is provided between the end heat exchanger 521 and the boss portion 311, and the first buffer 81 connects the boss portion 311 and the end heat exchanger 521 respectively.

[0132] The first buffer element 81 can be made of materials such as polycarbonate and polyethylene, which have both cushioning capabilities and insulation properties, and also have good adhesion and structural strength. The first buffer element 81 can also serve as a heat insulation component to insulate the upper end heat exchange element 521, reducing the probability of heat transfer from the second housing 30, thereby improving the heat exchange effect.

[0133] When the battery pack 100 is used in an electric vehicle, it will continuously experience minute, high-frequency vibrations from the road surface. Without the first buffer 81, these vibrations would be directly transmitted to the end heat exchanger 521 via the rigid boss 311, and then to the battery cell 20. Long-term vibration can lead to fatigue of the internal structure of the battery cell 20, loosening of connectors, and wear of insulation. The first buffer 81 can absorb and dissipate this vibration energy, providing a more stable operating environment for the battery cell 20.

[0134] When the vehicle 1000 travels over uneven roads, experiences a collision, or brakes suddenly, the battery unit 100 will be subjected to a large instantaneous impact force. The first buffer 81 prolongs the time of impact force through its own elastic deformation, which can reduce the impact acceleration transmitted to the battery cell 20 and prevent serious damage such as cracking of the battery cell 20 casing 24 and misalignment of the electrode plates to a certain extent.

[0135] In the above scheme, by providing a first buffer 81 between the end heat exchanger 521 and the boss portion 311, the battery cell 20 above the end buffer can be buffered, thus protecting the battery cell 20.

[0136] In some embodiments, the battery device 100 includes a plurality of battery cell assemblies 40 arranged along a third direction Z; the thermal management assembly 50 includes a current collector 51 and a plurality of heat exchangers 52 connected to the current collector 51, the current collector 51 extending along the third direction Z, the heat exchangers 52 extending along a second direction Y, and the heat exchangers 52 including two end heat exchangers 521 and at least one intermediate heat exchanger 522; along the third direction Z, the intermediate heat exchanger 522 is located between the two end heat exchangers 521; wherein, the intermediate heat exchanger 522 is heat-exchange connected to two adjacent battery cell assemblies 40; the third direction Z is intersecting with the first direction X and the second direction Y respectively.

[0137] The intermediate heat exchanger 522 can be bonded to two adjacent battery cell assemblies 40 on the side facing the battery cell assembly 40. The projection of the intermediate heat exchanger 522 along the first direction X covers at least a portion of the adjacent battery cell assemblies 40, that is, the intermediate heat exchanger 522 covers the shoulders of two adjacent battery cell assemblies 40 respectively. For example, the projection of the intermediate heat exchanger 522 along the first direction X will simultaneously cover the right side area of ​​the left battery cell assembly 40 and the left side area of ​​the right battery cell assembly 40, at which time the intermediate heat exchanger 522 can simultaneously contact two adjacent battery cell assemblies 40.

[0138] In the above scheme, the heat exchange efficiency of the thermal management component 50 can be improved by connecting the intermediate heat exchanger 522 with the two adjacent battery cell modules 40.

[0139] Figure 10 This is a partial cross-sectional schematic diagram of a battery device according to some embodiments of this application.

[0140] like Figure 10 As shown, in some embodiments, the battery cell 20 includes a housing 24 and electrode terminals 26. The electrode terminals 26 are disposed on the side of the housing 24 facing the second housing 30, and the electrode terminals 26 are disposed between adjacent intermediate heat exchangers 522. Along the first direction X, a second buffer 82 is disposed between the intermediate heat exchanger 522 and the second housing 30.

[0141] The battery cell 20 can be inverted, with the electrode terminals 26 facing downwards. The electrode terminals 26 and the intermediate heat exchangers 522 are spaced apart along the third direction Z, with the positive and negative electrode terminals 26 located between two adjacent intermediate heat exchangers 522. There is a gap between the electrode terminals 26 and the second housing 30 along the third direction Z. Placing the intermediate heat exchangers 522 within this gap allows for full utilization of the internal space of the battery device 100 without sacrificing the installation space of the battery cells 20.

[0142] The second buffer 82 can be made of materials such as foam or rubber. When the intermediate heat exchanger 522 vibrates up and down with the battery cell 20, the second buffer 82 will absorb the impact force through its own deformation, reducing the transmission of vibration to the battery cell 20. This is equivalent to adding an elastic pad under the intermediate heat exchanger 522, which to a certain extent prevents the battery cell 20 from deforming its outer shell 24 and damaging its internal cells due to hard impact.

[0143] Optionally, the structural strength of the first buffer 81 is greater than that of the second buffer 82. For example, the material of the first buffer 81 may include polycarbonate, polyethylene, etc., while the material of the second buffer 82 may include foam, rubber, etc. This allows the first buffer 81 located at the end to have greater load-bearing capacity, enabling it to better support the battery cell assembly 40 together with the mounting assembly 70 and the end heat exchanger 521.

[0144] In the above scheme, by placing the electrode terminals 26 between adjacent intermediate heat exchange components 522, the space utilization rate inside the battery device 100 can be improved, thereby increasing the energy density of the battery device 100. The intermediate buffer component is protected by the second buffer component 82.

[0145] In some embodiments, the limiting beam assembly 60 and the first housing 10 are both made of metal, and the limiting beam assembly 60 is welded to the first housing 10; or, the limiting beam assembly 60 is made of metal, the first housing 10 is made of non-metal, and the limiting beam assembly 60 is bonded to the first housing 10 or connected by fasteners.

[0146] The limiting beam assembly 60 can be made of steel, aluminum alloy or other profiles.

[0147] The first housing 10 can be made of stamped steel plate, aluminum alloy plate, etc. The limiting beam assembly 60 and the first housing 10 can be connected by laser welding, so that the limiting beam assembly 60 and the first housing 10 form a sturdy frame structure with high connection strength and rigidity.

[0148] The first housing 10 can also be made of plastics such as polyethylene or polyamide. In this case, the limiting beam assembly 60 and the first housing 10 can be bonded together using adhesives such as epoxy resin or polyurethane, saving space. Alternatively, bolts, screws, or other fasteners can be used to lock the limiting beam assembly 60 and the first housing 10 together, which is simple to operate and provides a firm connection.

[0149] In the above scheme, the limiting beam assembly 60, which is made of metal, and the first box 10 are connected by welding. The limiting beam assembly 60, which is made of different materials, and the first box 10 are connected by adhesive or fasteners, which can increase the stability of the connection between the limiting beam assembly 60 and the first box 10.

[0150] Figure 11 This is a partially exploded schematic diagram of a battery device according to some embodiments of this application; Figure 12 This is another partial cross-sectional schematic diagram of a battery device according to some embodiments of this application.

[0151] Please refer to the following: Figure 11 and Figure 12In some embodiments, the limiting beam assembly 60 includes a limiting beam 61 and an extension plate 62, the extension plate 62 being connected to the limiting beam 61, and at least a portion of the extension plate 62 being located between the battery cell 20 and the first housing 10, the extension plate 62 being bonded to the first housing 10.

[0152] If the limiting beam 61 is directly connected to the first housing 10, the connection area is small, and the stability of the connection is limited. Especially when the material of the first housing 10 is non-metallic, and the limiting beam assembly 60 needs to be bonded to the first housing 10, the bonding strength is limited. The area of ​​the extension plate 62 is larger than the area of ​​the limiting beam assembly 60, and the bonding area between the extension plate 62 and the first housing 10 is larger than the bonding area between the limiting beam 61 and the first housing 10.

[0153] The material of the extension plate 62 may include metal. The extension plate 62 and the limiting beam 61 may be first connected by welding, and then bonded to the first box 10 as an integral structure.

[0154] The portion of the extension plate 62 that extends beyond the limiting beam 61 can be bonded to the battery cell 20, thereby enabling the limiting beam assembly 60, the battery cell 20, and the first housing 10 to be interconnected to form a robust overall structure, thereby improving the rigidity of the battery device 100.

[0155] In the above scheme, the connection area between the limiting beam 61 and the first box 10 is increased by connecting the extension plate 62, thereby improving the connection stability between the limiting beam assembly 60 and the first box 10.

[0156] In some embodiments, the first housing 10 is provided with a recessed platform 11 and a cell bonding surface 12. The recessed platform 11 protrudes from the side opposite to the cell bonding surface 12. An extension plate 62 is disposed in the recessed platform 11, and the surface of the extension plate 62 opposite to the first housing 10 is flush with the cell bonding surface 12.

[0157] The cell bonding surface 12 is a flat area on the inner wall of the first housing 10, providing a flat bonding surface for the battery cell 20, and is bonded to one end of the battery cell 20 along the first direction X by thermally conductive adhesive or the like.

[0158] The recessed platform 11 is a partially machined recessed area in the first housing 10. Viewed from the inside of the first housing 10, the area corresponding to the recessed platform 11 appears recessed. Viewed from the outside of the first housing 10, the area corresponding to the recessed platform 11 appears convex.

[0159] The extension plate 62 is placed inside the recessed platform 11. The shape of the recessed platform 11 can be the same as or similar to that of the extension plate 62, and the size of the recessed platform 11 can also match the size of the extension plate 62. For example, the size of the recessed platform 11 can be the same as that of the extension plate 62, or the size of the recessed platform 11 can be slightly larger than that of the extension plate 62, so that the extension plate 62 can be perfectly embedded in the recessed platform 11.

[0160] "The surface of the extension plate 62 facing away from the first housing 10" means that the surface of the extension plate 62 facing the inside of the second housing 30 can directly contact the battery cell 20 and be bonded by thermally conductive adhesive, etc.

[0161] The surface of the extension plate 62 facing away from the first housing 10 is flush with the cell bonding surface 12. This means that the surface of the extension plate 62 facing the second housing 30 and the cell bonding surface 12 on the inner wall of the housing around it are at the same height level, forming a continuous, stepless, complete plane.

[0162] In the above scheme, by setting it flush, the extension plate 62 will not occupy the placement space of the battery cell 20 and will not affect the energy density of the battery device 100.

[0163] Figure 13 This is a structural schematic diagram of a limiting beam assembly according to some embodiments of this application.

[0164] like Figure 13 As shown, in some embodiments, the limiting beam assembly 60 includes a first end 63 and a second end 64 disposed opposite to each other, the first end 63 being fixed to the first housing 10; and the width of the first end 63 being greater than the width of the second end 64 along the second direction Y.

[0165] The first end 63 can be the top end of the limiting beam assembly 60, and the second end 64 is the bottom end of the limiting beam assembly 60. The outer contour of the limiting beam assembly 60 is a shape that is wide at one end and narrow at the other end.

[0166] The first end 63 can be fixed to the first housing 10 by welding, bonding, or fasteners.

[0167] In the above scheme, by setting the width of the first end 63 to be greater than the width of the second end 64, the connection area between the limiting beam assembly 60 and the first box 10 can be increased, thereby improving the connection stability between the limiting beam assembly 60 and the first box 10.

[0168] Figure 14 This is a partial structural schematic diagram of a limiting beam assembly according to some embodiments of this application.

[0169] like Figure 14As shown, in some embodiments, the limiting beam assembly 60 includes a first plate 65 and a second plate 66. The first plate 65 includes a first connecting portion 651 and a first bent portion 652 and a second bent portion 653 connected to the first connecting portion 651. The first bent portion 652 is located at a first end 63, and the second bent portion 653 is located at a second end 64. The second plate 66 includes a second connecting portion 661 and a third bent portion 662 and a fourth bent portion 663 connected to the second connecting portion 661. The third bent portion 662 is located at the first end, and the fourth bent portion 663 is located at the second end. Along the first direction X, the first bent portion 652 and the third bent portion 662 do not overlap, and the second bent portion 653 and the fourth bent portion 663 at least partially overlap.

[0170] The first plate 65 and the second plate 66 can be sheet metal parts with bent edges, and the limiting beam assembly 60 is assembled together by the first plate 65 and the second plate 66.

[0171] The first connecting portion 651 can be inclined relative to the first direction X, and the second connecting portion 661 can also be inclined relative to the first direction X, so that the end of the first connecting portion 651 near the second bending portion 653 and the end of the second connecting portion 661 near the fourth bending portion 663 are close to each other, while the end of the first connecting portion 651 near the first bending portion 652 and the end of the second connecting portion 661 near the third bending portion 662 are far apart from each other, so that the width of the first end 63 of the limiting beam assembly 60 is greater than the width of the second end 64 along the second direction Y.

[0172] Alternatively, at least one of the first connecting portion 651 and the second connecting portion 661 extends along the first direction X.

[0173] The bending directions of the first bend 652 and the second bend 653 can be different, while the bending directions of the third bend 662 and the fourth bend 663 can be the same. The first bend 652 and the third bend 662 can be connected by welding, bonding, or snap-fitting. The second bend 653 and the fourth bend 663 can be welded, bonded, or fastened with fasteners.

[0174] In the above scheme, by ensuring that the first bend 652 and the third bend 662 do not overlap, and by ensuring that the second bend 653 and the fourth bend 663 overlap at least partially, it is convenient to make the width of the first end 63 greater than the width of the second end 64.

[0175] In some embodiments, the limiting beam assembly 60 further includes a reinforcing plate 67, which includes a plurality of reinforcing segments 671 and connecting segments 672 located between the first plate 65 and the second plate 66. The connecting segments 672 are alternately arranged along a first direction X. The reinforcing segments 671 are disposed between the first connecting portion 651 and the second connecting portion 661, and the connecting segments 672 are fixed to the first connecting portion 651 or the second connecting portion 661.

[0176] The connecting segment 672 and the reinforcing end are alternately connected and located in the cavity formed by the first plate 65 and the second plate 66. The connecting segment 672 and the reinforcing segment 671 form a continuous, wavy structure. The connecting segment 672 can be welded to the first connecting part 651 or the second connecting part 661, and the reinforcing segment 671 is inclined relative to the first direction X. The reinforcing plate 67 acts as a support frame in the cavity between the first plate 65 and the second plate 66.

[0177] In the above scheme, the structural strength of the limiting beam assembly 60 can be increased by setting the reinforcing plate 67.

[0178] In some embodiments, the reinforcing plate 67 further includes a fifth bend 673, which is connected to the reinforcing section 671. The fifth bend 673 is disposed on the side of the first bend 652 facing the first housing 10 and is connected to the first housing 10.

[0179] The fifth bend 673 can be welded or bonded to the second bend 653, and the side of the fifth bend 673 facing the first bend 652 can be welded or bonded to the first bend 652.

[0180] The side of the fifth bend 673 facing the first housing 10 can be flush with the side of the third bend 662 facing the first housing 10, and both are connected to the first housing 10, or connected to the first housing 10 through an extension.

[0181] In the above solution, the fifth bending part 673 bends to one side of the first bending part 652 and connects with the first box 10, which can further increase the connection strength between the limiting beam assembly 60 and the first box 10.

[0182] In some embodiments, the first connecting portion 651 is provided with a first groove 654 recessed toward the second connecting portion 661; and / or, the second connecting portion 661 is provided with a second groove recessed toward the first connecting portion 651 (not shown in the figure).

[0183] Multiple first grooves 654 may be provided on the first connecting portion 651, and / or multiple second grooves may be provided on the second connecting portion 661. The first grooves 654 are recessed toward the second plate 66. The second grooves are recessed toward the first plate 65. The first grooves 654 and / or the second grooves act as reinforcing ribs, enhancing the resistance to deformation.

[0184] In the above scheme, the first groove 654 can increase the structural strength of the first plate 65; and / or, the second groove can increase the structural strength of the second plate 66.

[0185] In some embodiments, the battery device 100 further includes an output electrode and an output electrode base connected to the output electrode. The output electrode is connected to one of the battery cells 20. A mounting hole 68 is provided near the second end 64 of the limiting beam 61, and the output electrode base is disposed in the mounting hole 68.

[0186] The output terminal collects the electrical energy from multiple battery cell modules 40 and then transfers it to an external structure. For example, the output terminal is electrically connected to an external structure such as a battery management system or a high-voltage box.

[0187] The output electrode base can be a housing 22 made of insulating material, used to fix and protect the output electrode, and to provide electrical insulation and sealing.

[0188] Embedding the output pole base into the mounting hole 68 of the limiting beam assembly 60 is equivalent to arranging the two components overlapping in the first direction X, rather than arranging them side by side on the horizontal plane, thus freeing up space for placing more battery cells 20.

[0189] In the above solution, by installing the output electrode base in the mounting hole 68 in the limiting beam 61, the internal space of the battery device 100 can be saved and the energy density of the battery device 100 can be increased.

[0190] Figure 15 This is a partially exploded schematic diagram of the thermal management components of some embodiments of this application.

[0191] like Figure 15As shown, in some embodiments, the battery device 100 includes a plurality of battery cell assemblies 40 arranged along a third direction Z; the thermal management assembly 50 includes a current collector 51 and a plurality of heat exchange elements 52 connected to the current collector 51, the plurality of heat exchange elements 52 being spaced apart along a third direction Z, and the heat exchange elements 52 including two end heat exchange elements 521 and at least one intermediate heat exchange element 522; along the third direction Z, the intermediate heat exchange element 522 is located between the two end heat exchange elements 521, wherein the current collector 51 includes a first flow channel 511 and a second flow channel 512 arranged adjacently, the intermediate heat exchange element includes an inlet flow channel 5221 and an outlet flow channel 5222, the flow direction of the heat exchange medium in the inlet flow channel 5221 is away from the current collector 51, the flow direction of the heat exchange medium in the outlet flow channel 5222 is towards the current collector 51, the inlet flow channel 5221 is connected to the first flow channel 511, and the outlet flow channel 5222 is connected to the second flow channel 512.

[0192] A first through hole can be provided in the first flow channel 511, and the liquid inlet flow channel 5221 of the intermediate heat exchanger 522 is connected to the first flow channel 511 through the first through hole. A second through hole can be provided in the second flow channel, and the liquid outlet flow channel 5222 of the intermediate heat exchanger 522 is connected to the second flow channel 512 through the second through hole.

[0193] The first flow channel 511 and the second flow channel 512 are not connected to each other. The first flow channel 511 is used for liquid inlet, and the second flow channel 512 is used for liquid outlet. The heat exchange medium flows through the first flow channel 511 to the liquid inlet flow channel 5221 of each intermediate heat exchanger 522, and then flows out from the liquid outlet flow channel 5222 of each intermediate heat exchanger 522, and merges in the second flow channel 512 of the collector 51.

[0194] In the above scheme, the current collector 51 integrates the adjacent first flow channel 511 and second flow channel 512 to undertake the liquid supply and return of multiple intermediate heat exchangers. It is not necessary to design independent external liquid inlet pipes and liquid return pipes for each intermediate heat exchanger. Moreover, the first flow channel 511 and the second flow channel 512 are arranged adjacent to each other, which improves the integration of the thermal management component 50, simplifies the structure, and can improve the energy density of the battery device 100.

[0195] According to some embodiments of this application, this application provides a battery device 100, which includes a housing assembly, a battery cell assembly 40, a thermal management assembly 50, and a limiting beam assembly 60. The housing assembly includes a first housing 10 and a second housing 30 arranged along a first direction X, and the first housing 10 and the second housing 30 are interconnected to form a cavity. The battery cell assembly 40 is located in the cavity and includes a plurality of battery cells 20 stacked along a second direction Y. The thermal management assembly 50 is disposed between the battery cell assembly 40 and the second housing 30. Limiting beam assemblies 60 are provided at both ends of the battery cell assembly 40 along the second direction Y. The limiting beam assembly 60 is fixedly connected to the first housing 10. Along the first direction X, one end of the battery cell 20 is bonded to the first housing 10, and the other end is bonded to the thermal management assembly 50. The first direction X and the second direction Y are intersecting. The battery device 100 includes a plurality of battery cell assemblies 40 arranged along a third direction Z; the thermal management assembly 50 includes a current collector 51 and a plurality of heat exchangers 52 connected to the current collector 51, the plurality of heat exchangers 52 being spaced apart along the third direction Z, the plurality of heat exchangers 52 including two end heat exchangers 521 and at least one intermediate heat exchanger 522; along the third direction Z, the intermediate heat exchanger 522 is located between the two end heat exchangers 521, wherein the two end heat exchangers 521 are fixedly connected to the second housing 30; the third direction Z intersects with the first direction X and the second direction Y respectively.

[0196] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device 100, which is used to provide electrical energy.

[0197] The battery device 100 provided according to the embodiments of this application includes the battery cell 20 provided in the embodiments. Since the battery device 100 provided in the embodiments of this application adopts the battery cell 20 provided in the above embodiments, it has the same technical effect, which will not be repeated here.

[0198] The electrical device provided according to the embodiments of this application includes the battery device 100 provided in the above embodiments, and the battery device 100 is used to provide electrical energy.

[0199] The power supply device provided according to the embodiments of this application has the same technical effect as the battery device 100 provided in the embodiments of this application, and will not be described again here.

[0200] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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, characterized in that, include: The enclosure assembly includes a first enclosure and a second enclosure arranged along a first direction, wherein the first enclosure and the second enclosure are connected to each other to form a cavity; A battery cell assembly is located within the cavity, the battery cell assembly comprising a plurality of battery cells stacked along a second direction; A thermal management component is disposed between the battery cell assembly and the second housing; A limiting beam assembly is provided at both ends of the battery cell assembly along the second direction; wherein, The limiting beam assembly is fixedly connected to the first housing. Along the first direction, one end of the battery cell is bonded to the first housing, and the other end is bonded to the thermal management assembly; wherein the first direction and the second direction are intersecting.

2. The battery device according to claim 1, characterized in that, The battery device includes a plurality of battery cell assemblies, which are arranged along a third direction. The thermal management assembly includes a current collector and a plurality of heat exchangers connected to the current collector. The plurality of heat exchangers are spaced apart along the third direction, and each heat exchanger includes two end heat exchangers and at least one intermediate heat exchanger. Along the third direction, the intermediate heat exchanger is located between the two end heat exchangers. The two end heat exchangers are fixedly connected to the second housing; the third direction is respectively arranged to intersect with the first direction and the second direction.

3. The battery device according to claim 2, characterized in that, The second housing includes a bottom plate and a side wall arranged along the periphery of the bottom plate. The bottom plate has a boss and a groove. The boss protrudes towards the cavity relative to the groove. The end heat exchanger is connected to the boss. The side of the boss away from the end heat exchanger is provided with a bottom support. The battery device also includes a mounting assembly for mounting on an external structure, and the base extends to the mounting assembly.

4. The battery device according to claim 3, characterized in that, A first buffer is provided between the end heat exchanger and the boss portion, and the first buffer is connected to the boss portion and the end heat exchanger respectively.

5. The battery device according to claim 2, characterized in that, The end heat exchanger includes a heat exchange shell and a partition rib. An end heat exchange channel is formed inside the heat exchange shell. The partition rib is located inside the end heat exchange channel. The end heat exchange channel is divided into multiple end heat exchange sub-channels by the partition rib.

6. The battery device according to claim 5, characterized in that, The end heat exchanger is a one-piece molded structure.

7. The battery device according to claim 1, characterized in that, The battery device includes multiple battery cell assemblies, which are arranged along a third direction. The thermal management assembly includes a current collector and a plurality of heat exchange elements connected to the current collector. The current collector extends in a third direction, and the heat exchange elements extend in a second direction. Each heat exchange element includes two end heat exchange elements and at least one intermediate heat exchange element. In the third direction, the intermediate heat exchange element is located between the two end heat exchange elements. The intermediate heat exchanger is heat-exchange connected to two adjacent battery cell assemblies; the third direction is respectively arranged to intersect with the first direction and the second direction.

8. The battery device according to claim 7, characterized in that, The battery cell includes a housing and electrode terminals. The electrode terminals are disposed on the side of the housing facing the second housing and between adjacent intermediate heat exchangers. Along the first direction, a second buffer is disposed between the intermediate heat exchanger and the second housing.

9. The battery device according to claim 1, characterized in that, Both the limiting beam assembly and the first box body are made of metal, and the limiting beam assembly is welded to the first box body; or... The limiting beam assembly is made of metal, while the first housing is made of non-metal. The limiting beam assembly is bonded to the first housing or connected by fasteners.

10. The battery device according to any one of claims 1-9, characterized in that, The limiting beam assembly includes a limiting beam and an extension plate. The extension plate is connected to the limiting beam, and at least a portion of the extension plate is located between the battery cell and the first housing. The extension plate is bonded to the first housing.

11. The battery device according to claim 10, characterized in that, The first housing is provided with a recessed platform and a cell bonding surface. The recessed platform protrudes from the side of the cell bonding surface away from the second housing. The extension plate is disposed in the recessed platform, and the surface of the extension plate away from the first housing is flush with the cell bonding surface.

12. The battery device according to any one of claims 1-9, characterized in that, The limiting beam assembly includes a first end and a second end disposed opposite to each other, the first end being fixed to the first box body; and the width of the first end is greater than the width of the second end along the second direction.

13. The battery device according to claim 12, characterized in that, The limiting beam assembly includes a first plate and a second plate. The first plate includes a first connecting portion and a first bending portion and a second bending portion connected to the first connecting portion. The first bending portion is located at the first end, and the second bending portion is located at the second end. The second plate includes a second connecting portion and a third bending portion and a fourth bending portion connected to the second connecting portion. The third bending portion is located at the first end, and the fourth bending portion is located at the second end. Along the first direction, the first bending portion and the third bending portion do not overlap, and the second bending portion and the fourth bending portion at least partially overlap.

14. The battery device according to claim 13, characterized in that, The limiting beam assembly further includes a reinforcing plate, which includes a plurality of reinforcing segments and connecting segments located between the first plate and the second plate. The connecting segments are alternately arranged along the first direction. The reinforcing segments are disposed between the first connecting portion and the second connecting portion. The connecting segments are fixed to the first connecting portion or the second connecting portion.

15. The battery device according to claim 14, characterized in that, The reinforcing plate also includes a fifth bend, which is connected to the reinforcing section. The fifth bend is located on the side of the first bend facing the first housing and is connected to the first housing.

16. The battery device according to claim 13, characterized in that, The first connecting portion is provided with a first groove recessed toward the second connecting portion; and / or, the second connecting portion is provided with a second groove recessed toward the first connecting portion.

17. The battery device according to claim 12, characterized in that, The battery device further includes an output electrode and an output electrode base connected to the output electrode. The output electrode is connected to one of the battery cells. The limiting beam has a mounting hole near the second end, and the output electrode base is disposed in the mounting hole.

18. The battery device according to claim 2, characterized in that, The battery device includes a plurality of battery cell assemblies, which are arranged along a third direction. The thermal management assembly includes a current collector and a plurality of heat exchangers connected to the current collector. The plurality of heat exchangers are spaced apart along the third direction. Each heat exchanger includes two end heat exchangers and at least one intermediate heat exchanger. Along the third direction, the intermediate heat exchanger is located between the two end heat exchangers. The current collector includes a first flow channel and a second flow channel arranged adjacent to each other. The intermediate heat exchanger includes an inlet flow channel and an outlet flow channel. The flow direction of the heat exchange medium in the inlet flow channel is away from the current collector, and the flow direction of the heat exchange medium in the outlet flow channel is towards the current collector. The inlet flow channel is connected to the first flow channel, and the outlet flow channel is connected to the second flow channel.

19. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-18, the battery device being used to provide electrical energy.

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