Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a box body, a box cover and a battery monomer, the box has an opening. The box cover seals the opening, and the box cover and the box body jointly define a containing space. The battery monomers are arranged in the accommodating space; wherein the box cover comprises a metal part and an insulation part, the insulation part wraps the metal part, and the metal part is provided with a weight reduction structure. The metal part is coated by the insulating part, so that the box cover has enough strength and good insulating property, on one hand, the risk that the box cover is damaged due to insufficient strength when the single battery is in thermal runaway is reduced, and on the other hand, the risk that the single battery is in contact with the metal part is reduced. The metal part is provided with the weight reduction structure which can reduce the weight of the box cover, so that the weight of the battery device is reduced, the energy per unit weight of the battery device is improved, and the energy density of the battery device is improved.

Description

Technical Field

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

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

[0003] In the development of battery technology, in addition to improving the performance of battery devices, the energy density of battery devices is also an issue that needs to be considered. Therefore, how to improve the energy density of battery devices is an urgent problem to be solved in battery technology. Utility Model Content

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

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising a box body, a box cover and a battery cell; the box body has an opening; the box cover closes the opening, and the box cover and the box body together define a storage space; the battery cell is arranged in the storage space; wherein the box cover comprises a metal part and an insulating part, the insulating part covers the metal part, and the metal part is provided with a weight reduction structure.

[0006] In the above technical solution, the insulating part covers the metal part, so that the box cover has sufficient strength and good insulation performance, which reduces the risk of the box cover being damaged due to insufficient strength when the battery cell is in thermal runaway, and reduces the risk of the battery cell contacting the metal part. The metal part is provided with a weight-reducing structure, which can reduce the weight of the box cover, thereby reducing the weight of the battery device, increasing the energy per unit weight of the battery device, and improving the energy density of the battery device.

[0007] In some embodiments, the weight reduction structure includes a hollow portion that penetrates the metal part along the thickness direction of the box cover, and the insulating part blocks the hollow portion. By passing the hollow portion through the metal part along the thickness direction of the box cover, the hollow portion is easy to process, the processing cost of the metal part is reduced, and the hollow portion can further reduce the weight of the metal part; the hollow portion is blocked by the insulating part, and the insulating part can seal the hollow portion, thereby isolating the battery cell from the external environment.

[0008] In some embodiments, the metal part is provided with a plurality of hollow parts, and the plurality of hollow parts are arranged in rows and columns. The plurality of hollow parts can further reduce the weight of the metal part, and the plurality of hollow parts can improve the strength of the metal part and reduce the risk of damage to the metal part.

[0009] In some embodiments, part of the insulating part is embedded in the hollow part and connected to the metal part. In this way, the connection between the insulating part and the metal part is more stable, reducing the risk of the insulating part being separated from the metal part.

[0010] In some embodiments, along the thickness direction of the box cover, the metal part has a first surface and a second surface that are arranged opposite to each other, and the insulating part covers the first surface and the second surface; the hollow part includes a through hole, and the two ends of the through hole extend to the first surface and the second surface respectively. By setting the hollow part to include a through hole that passes through the first surface and the second surface of the metal part, the hollow part of this structure is easier to process and form. In addition, the metal part of this structure has better flatness and is less difficult to form.

[0011] In some embodiments, part of the insulating part is accommodated in the through hole and connected to the hole wall of the through hole. The through hole can reduce the weight of the box cover, improve the energy density of the battery device, and the through hole is easy to form, which can reduce the processing cost of the box cover. The part of the insulating part accommodated in the through hole is connected to the hole wall of the through hole, which increases the contact area between the insulating parts and increases the connection strength between the insulating part and the metal part.

[0012] In some embodiments, the metal part includes a plurality of first structural members and a plurality of second structural members; the plurality of first structural members extend along the first direction, and the plurality of first structural members are arranged at intervals along the second direction; the plurality of second structural members extend along the second direction, and the plurality of second structural members are arranged at intervals along the first direction, the second structural member is connected to the first structural member, and two adjacent first structural members and two adjacent second structural members jointly define a hollow portion, and the thickness direction, the first direction, and the second direction of the box cover are not coplanar and intersect each other. At least a part of the metal part is formed by the plurality of first structural members and the plurality of second structural members, and the arrangement of the first structural member and the second structural member can save the material use of the metal part and can also improve the structural strength of the metal part. A mesh structure can be formed by the plurality of first structural members extending along the first direction and the plurality of second structural members extending along the second direction to form a hollow portion on the metal part, so that the structure of the metal part is simpler and the manufacturing cost of the metal part can be effectively reduced. In addition, the metal part of this structure has good structural strength, so that the strength of the metal part is less affected by the arrangement of the hollow portion.

[0013] In some embodiments, the first structural member and the second structural member are arranged along the thickness direction of the box cover, so that the first structural member and the second structural member are more convenient to connect and the molding cost is low.

[0014] In some embodiments, the insulating portion covers the outer surface of the first structural member and the outer surface of the second structural member. In this way, the connection between the insulating portion and the outer surface of the first structural member and the outer surface of the second structural member is more stable, reducing the risk of the insulating portion being separated from the first structural member and the second structural member, thereby reducing the risk of the first structural member or the second structural member contacting the battery cell, and improving the reliability of the battery device.

[0015] In some embodiments, the insulating portion is an insulating coating disposed on the surface of the metal portion. In this way, the insulating coating can enhance the adsorption capacity with the metal portion and improve the connection strength between the insulating portion and the metal portion.

[0016] In some embodiments, the material damage temperature of the insulating part is greater than or equal to 400° C. This allows the insulating part to withstand high temperatures. When the battery cell is in thermal runaway, the material damage temperature of the insulating part is greater than or equal to 400° C., which can reduce the risk of the insulating part melting and causing insulation failure.

[0017] In some embodiments, the battery cell includes a pressure relief mechanism, which is arranged toward the box cover along the thickness direction of the box cover. When the battery cell is in thermal runaway, the high-temperature emissions in the battery cell are sprayed toward the box cover through the pressure relief mechanism, and the insulating part of the box cover can reduce the risk of the box cover being damaged, thereby reducing the risk of external air entering the accommodation space after the box cover is damaged and aggravating the thermal runaway of the battery cell, and reducing the risk of fire and explosion of the battery device.

[0018] In some embodiments, the insulating portion is made of polyimide, polyetheretherketone or a ceramic composite material.

[0019] In some embodiments, the metal portion is made of aluminum alloy, steel, magnesium alloy or copper alloy.

[0020] In a second aspect, an embodiment of the present application provides an electrical device, including a battery device provided by any embodiment of the first aspect, and the battery device is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0023] Figure 2An exploded view of a battery device provided in some embodiments of the present application;

[0024] Figure 3 A cross-sectional view of a battery device provided for some embodiments of the present application;

[0025] Figure 4 for Figure 3 A partial enlarged view of the middle A area;

[0026] Figure 5 A schematic diagram of the structure of a metal part provided in some embodiments of the present application;

[0027] Figure 6 for Figure 5 Sectional view of AA in the middle;

[0028] Figure 7 A cross-sectional view of a battery device provided in some other embodiments of the present application;

[0029] Figure 8 for Figure 7 A partial enlarged view of the middle B area;

[0030] Fig. 9 A cross-sectional view of a box cover provided for some embodiments of the present application;

[0031] Fig.10 A schematic diagram of the structure of a metal part provided in some further embodiments of the present application;

[0032] Fig.11 for Figure 7 A partial enlarged view of the middle C area.

[0033] Icons: 1-box cover; 11-metal part; 111-weight reduction structure; 1111-hollow part; 11111-through hole; 112-first surface; 113-second surface; 114-first structural member; 115-second structural member; 12-insulating part; 2-box body;

[0034] 10-accommodation device; 10a-accommodation space;

[0035] 20-battery cell; 201-pressure relief mechanism; 202-electrode terminal; 203-housing;

[0036] 100-battery device; 200-controller; 300-motor; 1000-vehicle;

[0037] X-first direction; Y-second direction; Z-thickness direction of the box cover. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0042] The term “plurality” used in this application refers to two or more (including two).

[0043] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0044] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0045] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0046] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0047] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0048] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0049] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0050] In some embodiments, the battery device may be a battery pack, which may include a receiving device and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the receiving device.

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

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

[0053] As an example, the receiving device can be used as a part of the chassis structure of the vehicle. For example, the roof of the receiving device can become at least a part of the floor of the vehicle, or the frame of the receiving device can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0054] In some embodiments, the battery device refers to an energy storage device, which includes a storage device, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0055] In battery technology, a storage device for a battery device generally includes a box body and a box cover, and the box cover can be made of metal material to make the box cover have high strength. The box cover made of metal material needs to be insulated from the battery cells in the storage device, and an insulating member can be provided between the box cover and the battery cells. However, providing an insulating member between the battery cells and the box cover increases the difficulty of assembling the battery device.

[0056] An insulating part can be wrapped on the outside of the metal material to make the box cover have insulation ability. However, although the provision of the insulating part realizes the insulation isolation between the box cover and the battery cell, the insulating part increases the weight of the box cover, and the weight of the metal material is also heavy, making the weight of the receiving device heavier, reducing the energy density of the battery device.

[0057] In view of this, in order to improve the energy density of the battery device, the embodiment of the present application provides a battery device, including a box body, a box cover and a battery cell. The box body has an opening, the box cover closes the opening, the box cover and the box body together define a storage space, and the battery cell is arranged in the storage space. Among them, the box cover includes a metal part and an insulating part, the insulating part covers the metal part, and the metal part is provided with a weight reduction structure.

[0058] By covering the metal part with the insulating part, the insulating part can insulate and isolate the battery cell and the metal part, and a weight-reducing structure is set on the metal part. The weight-reducing structure can reduce the weight of the box cover, thereby reducing the weight of the battery device. Therefore, such a box cover can take into account the insulation of the battery cell and the metal part and improve the energy density of the battery device, thereby improving the performance of the battery device.

[0059] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0061] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100 inside, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000.

[0062] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0063] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] Please refer to Figure 2 , Figure 2 The exploded view of the battery device 100 provided in some embodiments of the present application. The battery device 100 may include a receiving device 10 and a battery cell 20 , wherein the receiving device 10 is used to receive the battery cell 20 .

[0065] A closed space for accommodating a battery cell 20 is formed inside the containment device 10. In the battery device 100, the battery cell 20 may be one or more. If there are multiple battery cells 20, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 may be connected in series, in parallel, or in mixed connection to form a battery module, and the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the containment device 10. All battery cells 20 may also be directly connected in series, in parallel, or in mixed connection, and then the whole formed by all battery cells 20 may be accommodated in the containment device 10.

[0066] In some embodiments, the battery device 100 may further include a busbar, through which multiple battery cells 20 may be electrically connected to each other, so as to realize series connection, parallel connection or mixed connection of multiple battery cells 20. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0067] Please refer to Figure 3 and Figure 4 , Figure 3 A cross-sectional view of a battery device 100 provided in some embodiments of the present application; Figure 4 for Figure 3 A partial enlarged view of the A area. The embodiment of the present application provides a battery device 100, including a box body 2, a box cover 1 and a battery cell 20. The box body 2 has an opening. The box cover 1 closes the opening, and the box cover 1 and the box body 2 together define a storage space 10a. The battery cell 20 is arranged in the storage space 10a. Among them, the box cover 1 includes a metal part 11 and an insulating part 12, the insulating part 12 covers the metal part 11, and the metal part 11 is provided with a weight reduction structure 111.

[0068] The box cover 1 and the box body 2 are buckled together to form a receiving device 10. The box body 2 and the box cover 1 can be in various shapes, such as a cuboid, a cylinder, etc. The receiving device 10 can be a hollow structure with one side open, and the box cover 1 can also be a hollow structure with one side open. The open side of the box cover 1 and the open side of the box body 2 are buckled together to form a box body 2 with a closed space. The box body 2 can also be a hollow structure with one side open, and the box cover 1 is a plate-like structure. The box cover 1 is buckled on the open side of the box body 2, so as to form a receiving device 10 with a receiving space 10a, and the battery cell 20 is arranged in the receiving space 10a of the receiving device 10. The box body 2 and the box cover 1 can be connected by snapping, bonding or welding.

[0069] The metal part 11 of the box cover 1 can be a single layer or multiple layers. In the embodiment where the metal part 11 is a multiple layer, the multiple layers of metal parts 11 are stacked along the thickness direction Z of the box cover.

[0070] The insulating part 12 may be an insulating injection molding material covering the outer surface of the metal part 11, and the insulating part 12 is injection-molded on the outer surface of the metal part so that the insulating part 12 covers the metal part 11. The insulating part 12 may also be an insulating coating covering the outer surface of the metal part 11, and the insulating part 12 is sprayed on the outer surface of the metal part 11 so that the insulating part 12 covers the metal part 11.

[0071] The insulating part 12 may also be an insulating member coated on the outer surface of the metal part 11 . The insulating part 12 may have a receiving cavity, and the metal part 11 is received in the receiving cavity, so that the insulating part 12 covers the metal part 11 .

[0072] The metal part 11 may be a mesh structure having meshes, and the meshes are weight-reducing structures 111 .

[0073] The metal part 11 may also be a plate-like structure. The weight-reducing structure 111 may be disposed on the surface of the metal part 11 or may be disposed inside the metal part 11. The weight-reducing structure 111 may be a groove structure disposed on the metal part 11; for example, the metal part 11 has a first surface 112 facing the battery cell 20, and the first surface 112 is recessed toward the side away from the battery cell 20 to form a groove structure, and the notch of the groove structure is located on the first surface 112. The weight-reducing structure 111 may also be a hollow structure disposed on the metal part 11; for example, along the thickness direction Z of the box cover, the metal part 11 has a first surface 112 and a second surface 113 disposed opposite to each other, and the two ends of the hollow structure extend to the first surface 112 and the second surface 113 to penetrate the metal part 11. The weight-reducing structure 111 may also be a cavity structure disposed in the metal part 11.

[0074] In the embodiment of the present application, the insulating part 12 covers the metal part 11, so that the box cover 1 has sufficient strength and good insulation performance, which reduces the risk of the box cover 1 being damaged due to insufficient strength when the battery cell 20 is in thermal runaway, and reduces the risk of the battery cell 20 contacting the metal part 11. The metal part 11 is provided with a weight reduction structure 111, which can reduce the weight of the metal part 11, thereby reducing the weight of the box cover 1, and further reducing the weight of the battery device 100, thereby improving the energy density of the battery device 100.

[0075] In some embodiments, please refer to Figure 5 and Figure 6 , and further reference Figure 7-Figure 10 , Figure 5 A schematic diagram of the structure of the metal part 11 provided in some embodiments of the present application; Figure 6 for Figure 5 Sectional view of AA in the middle; Figure 7 A cross-sectional view of a battery device 100 provided in some other embodiments of the present application; Figure 8 for Figure 7 A partial enlarged view of the middle B area; Fig. 9 A cross-sectional view of a box cover 1 provided in some further embodiments of the present application; Fig.10 The schematic diagram of the structure of the metal part 11 provided in some embodiments of the present application is as follows. The weight reduction structure 111 includes a hollow portion 1111 penetrating the metal part 11 along the thickness direction Z of the box cover, and the insulating part 12 blocks the hollow portion 1111.

[0076] The hollow portion 1111 may be a through hole 11111 penetrating the metal portion 11 along the thickness direction Z of the box cover, or may be a notch penetrating the edge of the metal portion 11 along the thickness direction Z of the box cover.

[0077] There may be one or more hollow portions 1111. In the embodiment where there are multiple hollow portions 1111, all of the hollow portions 1111 may be through holes 11111; all of the hollow portions 1111 may be notches; or some of the hollow portions 1111 may be through holes 11111 and the other parts may be notches.

[0078] The insulating part 12 may cover the metal part 11 and the hollow part 1111, and the insulating part 12 may be located outside the hollow part 1111, so that the insulating part 12 blocks the hollow part 1111; the insulating part 12 may be partially embedded in the hollow part 1111 and connected to the wall of the hollow part 1111, so that the insulating part 12 blocks the hollow part 1111; the insulating part 12 may fill the hollow part 1111, so that the insulating part 12 blocks the hollow part 1111.

[0079] In this embodiment, the hollow portion 1111 is passed through the metal portion 11 along the thickness direction Z of the box cover, so that the hollow portion 1111 is easy to process, the processing cost of the metal portion 11 is reduced, and the hollow portion 1111 can further reduce the weight of the metal portion 11. The hollow portion 1111 is blocked by the insulating portion 12, and the insulating portion 12 can seal the hollow portion 1111, thereby isolating the battery cell 20 from the external environment.

[0080] In some embodiments, please refer to Figure 5 and Fig.10 The metal portion 11 is provided with a plurality of hollow portions 1111 , and the plurality of hollow portions 1111 are arranged in rows and columns.

[0081] The plurality of hollow portions 1111 may be arranged in a row and multiple columns; the plurality of hollow portions 1111 may be arranged in multiple rows and one column; or the plurality of hollow portions 1111 may be arranged in multiple rows and multiple columns.

[0082] The metal part 11 may be a metal plate, and the hollow part 1111 may be a through hole 11111 penetrating the metal plate; or the metal part may be a mesh structure formed by overlapping metal strips, and the hollow part 1111 may be a mesh hole of the mesh structure.

[0083] As an example, Figure 5 As shown, the multiple hollow parts 1111 include multiple through holes 11111. The through holes 11111 penetrate the metal part 11 along the thickness direction Z of the box cover. The multiple through holes 11111 are arranged at intervals and in multiple rows and columns.

[0084] As an example, Fig.10 As shown, the metal part 11 includes a plurality of first structural members 114 and a plurality of second structural members 115. The plurality of first structural members 114 extend along the first direction X, and the plurality of first structural members 114 are arranged at intervals along the second direction Y. The plurality of second structural members 115 extend along the second direction Y, and the plurality of second structural members 115 are arranged at intervals along the first direction X. The second structural members 115 are connected to the first structural members 114, and two adjacent first structural members 114 and two adjacent second structural members 115 jointly define a hollow portion 1111, and the plurality of hollow portions 1111 are arranged in multiple rows and columns.

[0085] In this embodiment, a plurality of hollow portions 1111 are provided to further reduce the weight of the metal portion 11 and improve the mass energy density of the battery device 100. By arranging the plurality of hollow portions 1111 in rows and columns, the strength of the metal portion 11 is made more uniform. In addition, in the embodiment where the metal portion 11 is a mesh structure, the metal portion 11 is formed by interlacing a plurality of first structural members 114 arranged at intervals along the second direction Y and a plurality of second structural members 115 arranged at intervals along the first direction X. Such a structure can improve the structural strength of the metal portion 11 and reduce the risk of the metal portion 11 being damaged when subjected to external force. The hollow portion 1111 is naturally formed by the arrangement of the first structural member 114 and the second structural member 115, which reduces the processing cost of the hollow portion 1111 and also reduces the risk of reducing the strength of the metal portion 11 due to processing the hollow portion 1111.

[0086] In some embodiments, please refer to Figure 7 and Fig. 9 Part of the insulating portion 12 is embedded in the hollow portion 1111 and connected to the metal portion 11 .

[0087] The insulating portion 12 may fill only a portion of the hollow portion 1111 ; or the insulating portion 12 may fill the entire hollow portion 1111 .

[0088] In this embodiment, the connection between the insulating part 12 and the metal part 11 is more stable, reducing the risk of the insulating part 12 being separated from the metal part 11. In addition, in the embodiment where the metal part 11 is a mesh structure, the insulating part 12 is partially embedded in the hollow part 1111, which can also improve the flatness of the box cover 1 and reduce the wear of the box cover 1 during use.

[0089] In some embodiments, please refer to Figure 6 Along the thickness direction Z of the box cover, the metal part 11 has a first surface 112 and a second surface 113 that are oppositely disposed, and the insulating part 12 covers the first surface 112 and the second surface 113. The hollow portion 1111 includes a through hole 11111, and both ends of the through hole 11111 extend to the first surface 112 and the second surface 113 respectively.

[0090] The first surface 112 and the second surface 113 may be flat surfaces or curved surfaces.

[0091] There may be one or more through holes 11111. Both ends of the through hole 11111 extend to the first surface 112 and the second surface 113, respectively, to form openings on the first surface 112 and the second surface 113. The insulating portion 12 covers the openings of the through hole 11111 on the first surface 112 and the openings on the second surface 113.

[0092] The insulating portion 12 may block the opening of the through hole 11111 and be located outside the opening of the through hole 11111; or the insulating portion 12 may block the opening of the through hole 11111 and be partially located inside the through hole 11111.

[0093] In this embodiment, the hollow portion 1111 includes a through hole 11111 penetrating the first surface 112 and the second surface 113 of the metal portion 11. The hollow portion 1111 of this structure is easier to process and shape. In addition, the metal portion 11 of this structure has better flatness and is less difficult to shape.

[0094] In some embodiments, please refer to Figure 7 and Figure 8 Part of the insulating portion 12 is accommodated in the through hole 11111 and connected to the hole wall surface of the through hole 11111.

[0095] The insulating portion 12 may fill only a portion of the through hole 11111, or the insulating portion 12 may fill the entire through hole 11111. The insulating portion 12 may be bonded to the wall of the through hole 11111, or the insulating portion 12 may abut against the wall of the through hole 11111.

[0096] The hollow portion 1111 includes a plurality of through holes 11111 penetrating the metal portion 11 along the thickness direction Z of the box cover. Part of the insulating portion 12 is embedded in the through holes 11111 and connected to the hole walls of the through holes 11111 to seal the through holes 11111.

[0097] In this embodiment, the portion of the insulating part 12 accommodated in the through hole 11111 is connected to the hole wall of the through hole 11111, which increases the contact area between the insulating part 12 and the hole wall of the through hole 11111 and increases the connection strength between the insulating part 12 and the metal part 11.

[0098] In some embodiments, please refer to Fig. 9 and Fig.10 The metal part 11 includes a plurality of first structural members 114 and a plurality of second structural members 115. The plurality of first structural members 114 extend along the first direction X, and the plurality of first structural members 114 are arranged at intervals along the second direction Y. The plurality of second structural members 115 extend along the second direction Y, and the plurality of second structural members 115 are arranged at intervals along the first direction X. The second structural members 115 are connected to the first structural members 114, and two adjacent first structural members 114 and two adjacent second structural members 115 jointly define a hollow portion 1111, and the thickness direction Z, the first direction X, and the second direction Y of the box cover are not coplanar and intersect each other.

[0099] The number of the first structural members 114 and the number of the second structural members 115 may be the same or different. The first structural members 114 and the second structural members 115 may be bonded, clamped, or welded.

[0100] The first structural member 114 and the second structural member 115 may both be metal wires or metal plates. A portion of the first structural member 114 may be located below a portion of the second structural member 115, and another portion of the first structural member 114 may be located above another portion of the second structural member 115, so that the first structural member 114 and the second structural member 115 are arranged alternately. Alternatively, multiple first structural members 114 may be located above multiple second structural members 115; or multiple second structural members 115 may be located above multiple first structural members 114. Alternatively, one of the first structural member 114 and the second structural member 115 may have a through hole, and the other of the first structural member 114 and the second structural member 115 may be inserted into the through hole. It is understood that in the embodiment in which the first structural member 114 and the second structural member 115 are arranged alternately, the metal part 11 may not have the first surface 112 and the second surface 113.

[0101] Two adjacent first structural members 114 are spaced apart so that a first gap is formed between the two adjacent first structural members 114 , and two adjacent second structural members 115 are spaced apart so that a second gap is formed between the two adjacent second structural members 115 . The first gap and the second gap have an overlapping portion, and the overlapping portion is a hollow portion 1111 .

[0102] The thickness direction Z, the first direction X, and the second direction Y of the box cover are not coplanar and intersect each other, that is, the thickness direction Z, the first direction X, and the second direction Y of the box cover are not in the same plane, and any two of the three directions can be acute angles, right angles, or obtuse angles; as an example, the thickness direction Z, the first direction X, and the second direction Y of the box cover are perpendicular to each other.

[0103] At least a part of the metal part 11 is formed by a plurality of first structural members 114 and a plurality of second structural members 115. The arrangement of the first structural members 114 and the second structural members 115 can save the material usage of the metal part 11 and can also improve the structural strength of the metal part 11. A mesh structure can be formed by a plurality of first structural members 114 extending along the first direction X and a plurality of second structural members 115 extending along the second direction Y to form a hollow portion 1111 on the metal part 11, so that the structure of the metal part 11 is simpler and the manufacturing cost of the metal part 11 can be effectively reduced. In addition, the metal part 11 of this structure has good structural strength, so that the strength of the metal part 11 is less affected by the arrangement of the hollow portion 1111.

[0104] In some embodiments, please refer to Fig. 9 and Fig.10 The first structural member 114 and the second structural member 115 are arranged along the thickness direction Z of the box cover.

[0105] The first structure member 114 may be closer to the battery cell 20 than the second structure member 115 ; or the first structure member 114 may be farther away from the battery cell 20 than the second structure member 115 .

[0106] like Fig.10 As shown, a plurality of first structural members 114 are arranged at intervals along the second direction Y, and a plurality of second structural members 115 are arranged at intervals along the first direction X. Along the thickness direction Z of the box cover, the plurality of first structural members 114 are farther away from the battery cell 20 than the plurality of second structural members 115, and the first structural members 114 and the second structural members 115 are welded and connected.

[0107] In this embodiment, during the manufacturing process of the metal part 11, a plurality of second structural members 115 may be placed at intervals on a plane, and then a plurality of first structural members 114 may be placed at intervals on the second structural member 115 in sequence, and the first structural members 114 and the second structural members 115 may be welded and fixed. In this way, the risk of the first structural member 114 and the second structural member 115 being damaged by bending may be reduced, the first structural member 114 and the second structural member 115 may be connected more conveniently, and the molding cost may be low.

[0108] In some embodiments, please refer to Fig. 9 The insulating portion 12 covers the outer surface of the first structure member 114 and the outer surface of the second structure member 115 .

[0109] The outer surface of the first structural member 114 refers to the surface exposed after the first structural member 114 and the second structural member 115 are connected, and the outer surface of the second structural member 115 refers to the surface exposed after the second structural member 115 is connected to the first structural member 114. The first structural member 114, the second structural member 115 and the hollow portion 1111 are enclosed in the insulating portion 12, and the insulating portion 12 is attached to the outer surface of the first structural member 114 and the outer surface of the second structural member 115.

[0110] In this embodiment, the connection between the insulating portion 12 and the outer surface of the first structural member 114 and the outer surface of the second structural member 115 is more stable, reducing the risk of the insulating portion 12 being separated from the first structural member 114 and the second structural member 115, thereby reducing the risk of the first structural member 114 or the second structural member 115 contacting the battery cell 20, thereby improving the reliability of the battery device 100.

[0111] In some embodiments, the insulating portion 12 is an insulating coating disposed on the surface of the metal portion 11. The metal portion 11 covers the opening of the box body 2 to isolate the accommodating space 10a from the external environment. The weight-reducing structure 111 may be a cavity structure disposed in the metal portion 11; or the weight-reducing structure 111 may be a groove structure opened on the first surface 112 and / or the second surface 113 of the metal portion.

[0112] In this embodiment, the insulating portion 12 is provided as an insulating coating, which can enhance the adsorption capacity with the metal portion 11 and improve the connection strength between the insulating portion 12 and the metal portion 11. The insulating coating can also improve the sealing performance of the metal portion 11 to improve the insulation effect between the metal portion 11 and the battery cell 20. When the battery cell 20 has thermal runaway, since the metal portion 11 closes the opening, the box cover 1 has no passage for the high-temperature emissions released by the battery cell to pass through, which can reduce the risk of external airflow entering the accommodation space 10a through the box cover and aggravating the thermal runaway of the battery cell.

[0113] In some embodiments, the material damage temperature of the insulating portion 12 is greater than or equal to 400°C.

[0114] The material damage temperature can be the melting point of the material or the decomposition temperature of the material. If the material has a melting point but no decomposition temperature, the melting point is the material damage temperature; if the material has a decomposition temperature but no melting point, the decomposition temperature is the material damage temperature; if the material has both a melting point and a decomposition temperature, the smaller of the melting point and the decomposition temperature is the material damage temperature.

[0115] The material damage temperature of the insulating part 12 can be 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, 1000℃, 1100℃, 1200℃, 1300℃, 1400℃, 1500℃, 1600℃, 1700℃, 1800℃, 1900℃, 2000℃, etc.

[0116] In this embodiment, the material damage temperature of the insulating portion 12 is high, which can enhance the heat resistance of the box cover 1 and reduce the risk of the insulating portion 12 melting in a high temperature environment, thereby maintaining the insulating portion 12 to insulate and isolate the battery cell 20 and the metal portion 11. In the embodiment where the insulating portion 12 blocks the hollow portion 1111, the high temperature resistant insulating portion 12 can maintain the seal of the hollow portion 1111 in a high temperature environment, thereby isolating the battery cell 20 from the external environment. When the battery cell 20 is in thermal runaway, the contact of oxygen and other substances in the air with the battery cell 20 can aggravate the thermal runaway of the battery cell 20, which has the risk of fire and explosion. By providing the high temperature resistant insulating portion 12 to seal the containment device 10, the contact of external air with the battery cell 20 inside the containment device 10 is reduced, the risk of fire and explosion of the battery cell 20 inside the containment device 10 is reduced, and the reliability of the battery device 100 is improved.

[0117] In some embodiments, please refer to Fig.11 , Fig.11 for Figure 7 A partial enlarged view of the middle C region. The battery cell 20 includes a pressure relief mechanism 201 , which is disposed toward the insulating portion 12 along the thickness direction Z of the box cover.

[0118] The battery cell 20 generally includes a housing 203, an electrode assembly (not shown in the figure), an electrode terminal 202 and a pressure relief mechanism 201. The electrode assembly is disposed in the housing 203, and the electrode terminal 202 is disposed in the housing 203. The electrode terminal 202 is used to electrically connect the electrode assembly, and the electrode assembly is electrically connected to an external circuit through the electrode terminal 202 to realize charging or discharging of the battery cell 20. The pressure relief mechanism 201 is disposed in the housing 203, and the pressure relief mechanism 201 and the electrode terminal 202 may be disposed in the same wall of the housing 203, or in different walls of the housing 203.

[0119] The high-temperature emissions from the battery cells 20 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of the isolation membrane, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0120] In this embodiment, along the thickness direction Z of the box cover, the pressure relief mechanism 201 of the battery cell 20 is arranged toward the box cover 1, so that the insulating part 12 of the box cover 1 covers the pressure relief mechanism 201. When the battery cell 20 has thermal runaway, the high-temperature discharge in the battery cell 20 is sprayed toward the insulating part 12 through the pressure relief mechanism 201. The high temperature resistance of the insulating part 12 can delay the damage of the box cover 1, and the insulating part 12 is not easy to melt, so that the box cover 1 maintains its original state, reduces the risk of the box cover 1 being damaged, and enables the box cover 1 to maintain the sealing of the receiving device 10, reduces the contact of external air with the battery cell 20 inside the receiving device 10, reduces the risk of fire and explosion of the battery cell 20 inside the receiving device 10, and improves the reliability of the battery device 100.

[0121] In some embodiments, the insulating portion 12 is made of polyimide, polyetheretherketone or a ceramic composite material.

[0122] The material of the insulating portion 12 has the characteristics of high temperature resistance and plasticity, so that the insulating portion 12 can be attached to or wrapped on the outer surface of the metal portion 11 .

[0123] In some embodiments, the metal portion 11 may be made of aluminum alloy, steel, magnesium alloy or copper alloy.

[0124] By using the above metal material to manufacture the metal part 11 , the metal part 11 can have higher strength and plasticity, so that a thinner metal part 11 can be manufactured, the volume of the box cover 1 can be reduced, and the volume energy density of the battery device 100 can be improved.

[0125] An embodiment of the present application provides an electrical device, including the battery device 100 provided by any one of the above embodiments, and the battery device 100 is used to provide electrical energy to the electrical device.

[0126] Please continue to refer to Figure 5-Figure 8 The embodiment of the present application provides a battery device 100, which includes a containing device 10 and a battery cell 20. The containing device 10 includes a box body 2 and a box cover 1. The box body 2 has an opening, and the box cover 1 closes the opening. The containing device 10 and the box cover 1 jointly define a containing space 10a, and the battery cell 20 is contained in the containing space 10a. Among them, the box cover 1 includes a metal part 11 and an insulating part 12. The metal part 11 has a through hole 11111 that penetrates the metal part 11 along the thickness direction Z of the box cover. The insulating part 12 covers the metal part 11, and the insulating part 12 fills the through hole 11111. The battery cell 20 has a pressure relief mechanism 201, which is arranged toward the box cover 1. The material damage temperature of the insulating part 12 of the box cover 1 is greater than or equal to 400°C.

[0127] By covering the metal part 11 with the insulating part 12, the insulating part 12 can insulate and isolate the metal part 11 and the battery cell 20, reducing the risk of the battery cell 20 contacting the metal part 11. By filling the through hole 11111 with the insulating part 12, the connection between the insulating part 12 and the hole wall of the through hole 11111 can be made more stable, and the strength of the insulating part 12 in the through hole 11111 can be improved, reducing the risk of the insulating part 12 in the through hole 11111 collapsing. The pressure relief mechanism 201 of the battery cell 20 is arranged toward the insulating part 12 of the box cover 1, and the material damage temperature of the insulating part 12 is greater than or equal to 400°C. When the battery cell 20 is in thermal runaway, the high-temperature emissions in the battery cell 20 are sprayed toward the insulating part 12. The insulating part 12 can improve the heat resistance of the box cover 1 and reduce the risk of the box cover 1 being damaged.

[0128] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0129] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box body having an opening; A box cover, closing the opening, wherein the box cover and the box body together define a containing space; A battery cell is arranged in the accommodation space; The box cover includes a metal part and an insulating part, the insulating part covers the metal part, and the metal part is provided with a weight-reducing structure.

2. The battery device according to claim 1, characterized in that The weight-reducing structure includes a hollow portion penetrating the metal portion along a thickness direction of the box cover, and the insulating portion blocks the hollow portion.

3. The battery device according to claim 2, characterized in that: The metal part is provided with a plurality of hollow parts, and the plurality of hollow parts are arranged in rows and columns.

4. The battery device according to claim 2, characterized in that: Part of the insulating portion is embedded in the hollow portion and connected to the metal portion.

5. The battery device according to claim 2, characterized in that: Along the thickness direction of the box cover, the metal part has a first surface and a second surface which are arranged opposite to each other, and the insulating part covers the first surface and the second surface; The hollow portion includes a through hole, and two ends of the through hole extend to the first surface and the second surface respectively.

6. The battery device according to claim 5, characterized in that Part of the insulating portion is accommodated in the through hole and connected to the hole wall surface of the through hole.

7. The battery device according to claim 2, characterized in that: The metal part includes: A plurality of first structural members extending along a first direction, wherein the plurality of first structural members are spaced apart along a second direction; A plurality of second structural members extend along the second direction, and the plurality of second structural members are arranged at intervals along the first direction. The second structural members are connected to the first structural members, and two adjacent first structural members and two adjacent second structural members jointly define the hollow portion. The thickness direction of the box cover, the first direction, and the second direction are not coplanar and intersect with each other.

8. The battery device according to claim 7, characterized in that: The first structural member and the second structural member are arranged along the thickness direction of the box cover.

9. The battery device according to claim 7, characterized in that: The insulating portion covers an outer surface of the first structure member and an outer surface of the second structure member.

10. The battery device according to claim 1, wherein: The insulating portion is an insulating coating disposed on the surface of the metal portion.

11. The battery device according to any one of claims 1 to 10, characterized in that: The material damage temperature of the insulating part is greater than or equal to 400°C.

12. The battery device according to claim 11, characterized in that The battery cell includes a pressure relief mechanism, and the pressure relief mechanism is arranged toward the box cover.

13. The battery device according to claim 11, characterized in that: The insulating part is made of polyimide, polyetheretherketone or ceramic composite material.

14. The battery device according to any one of claims 1 to 10, characterized in that: The material of the metal part is aluminum alloy, steel, magnesium alloy or copper alloy.

15. An electrical device, characterized in that: It comprises a battery device as described in any one of claims 1 to 14, wherein the battery device is used to provide electrical energy to the electrical device.

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