Battery device and power utilization device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries. A battery cell assembly of a battery device includes at least two battery cells. The mounting box comprises a box body and a box cover covering the box body, the box body comprises a supporting body, a main support, a mounting seat and a coating layer coating the outer surface of the supporting body, the coating layer is made of a reinforced composite material, a containing cavity is defined by the coating layer, the battery monomers are located in the containing cavity, the main support is located on the side, facing the supporting body, of the coating layer, and the mounting seat is located on the mounting seat. The main support is connected with the supporting body and located on the side, away from the box cover, of the containing cavity to bear the battery monomer assembly, and the mounting base is connected with the main support. The bottom protection plate is located on the side, away from the box cover, of the box body. And the connecting piece penetrates through the bottom protection plate and the mounting seat so as to mount the bottom protection plate on the box body. The mounting seat can provide better mounting support for the connecting piece, and the connecting piece is arranged on the bottom protection plate and the mounting seat in a penetrating manner, so that the bottom protection plate can be firmly mounted on the box body.

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] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] The battery pack casing is covered with a reinforced composite material, making it difficult to install the bottom protective plate onto the casing. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a battery device and an electrical device to better facilitate the installation between the bottom protective plate and the housing.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery device, comprising:

[0007] A battery cell assembly, comprising at least two battery cells;

[0008] The mounting box includes a box body and a box cover covering the box body. The box body includes a support body, a main support, a mounting base, and a covering layer covering the outer surface of the support body. The covering layer is made of reinforced composite material. The covering layer surrounds a receiving cavity. The battery cell is located in the receiving cavity. The main support is located on the side of the covering layer facing the support body. The main support is connected to the support body. The main support is located on the side of the receiving cavity away from the box cover to support the battery cell assembly. The mounting base is connected to the main support.

[0009] The bottom protective plate is located on the side of the box body away from the box cover;

[0010] A connector is provided through the bottom guard plate and the mounting base to install the bottom guard plate into the housing.

[0011] In this embodiment, the casing has high strength by using a reinforced composite material as the outer covering material for the support body and by setting a main support to support the battery cell assembly within the cavity. The mounting base is connected to the main support, and a connector passes through the bottom cover plate and the mounting base to install the bottom cover plate onto the casing. The connector is connected to the mounting base, which provides mounting support for the connector of the bottom cover plate. The load of the bottom cover plate is transferred to the mounting base through the connector and then to the main support. The main support and the mounting base jointly bear the load of the bottom cover plate, allowing the mounting base to provide good mounting support for the connector. The connector passing through the bottom cover plate and the mounting base securely installs the bottom cover plate onto the casing.

[0012] In some embodiments, the mounting base includes:

[0013] The main seat has a weight-reducing cavity, and the main seat is connected to the main support.

[0014] An installation sleeve is inserted into the weight reduction cavity, the installation sleeve is connected to the main seat, and the connecting member is inserted into the installation sleeve.

[0015] In this embodiment, the weight-reducing cavity of the main seat helps to reduce the overall weight of the mounting base. The mounting sleeve connected to the main seat passes through the weight-reducing cavity, facilitating the connection of the connectors near the weight-reducing cavity. This provides better installation support for the connectors and also helps to reduce the weight of the mounting base.

[0016] In some embodiments, the mounting sleeve has an internal thread, the mounting base further includes a threaded insert, the threaded insert is threadedly connected to the internal thread, and the connector is threadedly connected to the threaded insert.

[0017] In this embodiment, by setting a threaded insert, the internal thread of the mounting sleeve can be protected to a certain extent. When the threaded insert is worn due to repeated disassembly and assembly between the connector and the threaded insert, the threaded insert can be unscrewed from the mounting sleeve and replaced with a new threaded insert. Maintenance is convenient and does not require replacement of the entire mounting base, which helps to reduce maintenance costs.

[0018] In some embodiments, the support partially fills the weight-reduction cavity, and the density of the support is less than the density of the main seat.

[0019] In this embodiment, the support with lower density is filled in the weight reduction cavity, which not only helps to improve the load-bearing capacity of the main seat and reduce the possibility of collapse of the weight reduction cavity of the main seat, but also reduces the weight of the main seat to a certain extent.

[0020] In some embodiments, the mounting base further includes a hanging bracket connected to the main base. The hanging bracket is a solid structure and has a mounting hole for suspending the housing, the mounting hole extending through the hanging bracket.

[0021] In this embodiment, the battery device is installed on the main body of the electrical device through the mounting hole of the hanging bracket. The overall load of the battery device is basically applied to the hanging bracket. The hanging bracket is a solid structure, which helps to improve the load-bearing capacity of the hanging bracket. The load of the main body of the device acting on the hanging bracket can be transferred to the main support at least through the main bracket. The main support and the hanging bracket jointly bear the load applied to the hanging bracket by the main body of the electrical device, which helps the hanging bracket to bear the load better.

[0022] In some embodiments, the arrangement direction of the housing and the lid is a first direction, and the mounting base is provided on both sides of the receiving cavity along the second direction. The second direction is arranged intersecting the first direction. The mounting holes and the mounting sleeves are arranged along the second direction, and the mounting sleeves on both sides are located between the mounting holes on both sides along the second direction.

[0023] In this embodiment, since the mounting holes and mounting sleeves are arranged along the second direction, and the mounting sleeves on both sides are located between the mounting holes on both sides along the second direction, with the mounting holes on both sides arranged outwards along the second direction, it facilitates the installation of the hanging structure on the main body of the electrical device with the mounting holes. Because the mounting holes and mounting sleeves are arranged along the second direction, and the mounting sleeves on both sides are located between the mounting holes on both sides along the second direction, with the mounting sleeves arranged inwards along the second direction, the connector for the bottom protective plate can be well connected to the mounting sleeve near the inward position along the second direction. This minimizes the laying area of ​​the bottom protective plate while basically meeting the installation requirements.

[0024] In some embodiments, the support has expansion beams, and expansion beams are provided on both sides of the battery cell assembly. The expansion beams on both sides are arranged in a third direction, which is intersected with the first direction and the second direction, respectively.

[0025] In this embodiment, the second direction, i.e. the arrangement direction of the mounting seats on both sides, is also the arrangement direction of the mounting holes on both sides. The battery device is mainly suspended on the main body of the device along the opposite sides of the second direction. The arrangement direction of the expansion beams on both sides is the third direction. The third direction is arranged to intersect with the first direction and the second direction, so that the arrangement direction of the expansion beams on both sides and the arrangement direction of the mounting holes on both sides are in two different directions. The torque formed by the load borne by the battery device at the mounting holes on both sides has little effect on the force exerted by the expansion beams on the battery cell assembly to suppress expansion.

[0026] In some embodiments, the support has expansion beams, and expansion beams are provided on opposite sides of the battery cell assembly. The battery device also includes a base, and the expansion beams on each side are connected to the base on the side away from the cover along the arrangement direction of the housing and the cover. The base is connected to the main support.

[0027] In this embodiment, the base is connected between the expansion beam and the main support. When the battery cells of the battery device expand during normal operation and exert an expansion force on the expansion beam, the load borne by the expansion beam can be transferred to the main support through the base. The expansion beam, the base and the main support jointly bear the expansion force of the battery cell assembly, so that the expansion beam can bear the load better and it is beneficial to suppress the expansion of the battery cell assembly.

[0028] In some embodiments, the projection area of ​​the battery cell assembly spans the projection area of ​​the base and the projection area of ​​the expansion beam along the arrangement direction of the expansion beams on both sides.

[0029] In this embodiment, the expansion force of the battery cell in the battery cell assembly acts on the corresponding position of the covering layer. Since the projection area of ​​the battery cell assembly spans the projection area of ​​the base and the projection area of ​​the expansion beam along the arrangement direction of the box and the box cover, part of the expansion force at the corresponding position of the covering layer is transmitted to the expansion beam and then to the base. Part of the expansion force on the covering layer is directly transmitted to the base, which reduces the load borne by the expansion beam and reduces the possibility of the expansion beam being misaligned relative to the base under the action of expansion force. The structure formed by the expansion beam and the base has greater rigidity, which improves the ability of the structure formed by the expansion beam and the base to resist the expansion deformation of the battery cell.

[0030] In some embodiments, the base includes:

[0031] A support platform is connected to the side of the expansion beam opposite to the box cover along the arrangement direction of the box body and the box cover. The projection area of ​​the battery cell assembly spans the projection area of ​​the support platform and the projection area of ​​the expansion beam along the arrangement direction of the box body and the box cover.

[0032] The base is connected to the side of the platform opposite to the box cover along the arrangement direction of the box body and the box cover. The base is connected to the main support and is projected along the arrangement direction of the expansion beams on both sides. The projection area of ​​the battery cell assembly is offset from the projection area of ​​the base.

[0033] In this embodiment, part of the expansion force of the battery cell assembly during normal operation is transmitted to the support platform through the cladding layer and expansion beam, while another part is directly transmitted to the support platform through the cladding layer. This reduces the load on the expansion beam and lowers the possibility of misalignment of the expansion beam relative to the base under the action of expansion force. Because the projection area of ​​the base and the projection area of ​​the battery cell are offset, the impact of the battery cell assembly on the spatial arrangement of the base is minimal, and the shape and size of the base can be set according to actual needs. Through the positional arrangement of the support platform, the base, and the battery cell assembly, the base can both roughly meet the load-bearing requirements of the battery cell assembly's expansion force and allow the shape and size of the base to meet actual needs, resulting in flexible arrangement.

[0034] In some embodiments, both the base and the platform are hollow structures, the support is partially located within the base, and the support is partially located within the space enclosed by the base and the platform. The density of the base and the density of the platform are both greater than the density of the support.

[0035] In this embodiment, by filling the seat body and the space enclosed by the seat body and the support platform with a support body of low density, the base can bear the load better while reducing the weight.

[0036] In some embodiments, the base is made of metal.

[0037] In this embodiment, the metal base can better support the expansion force of the battery cell assembly.

[0038] In some embodiments, the mounting base is made of metal, and / or the main support is made of metal.

[0039] In this embodiment, the metal mounting base facilitates the installation of the bottom protective plate connectors, and the metal main support gives the main support good load-bearing capacity.

[0040] In some embodiments, the support is made of foamed material or reinforced composite material.

[0041] In this embodiment, the foamed material has a low density, and using foamed material for the support body reduces weight while providing some support for the box. The support body uses reinforced composite materials, which helps improve the overall strength of the box.

[0042] In some embodiments, the main support is plate-shaped, and grooves are formed on both sides of the main support along the arrangement direction of the box body and the box cover. The number of grooves is at least two, and the at least two grooves are arranged sequentially. The grooves on both sides are arranged alternately along the arrangement direction of the at least two grooves.

[0043] In this embodiment, the grooves on both sides are arranged alternately along the arrangement direction of at least two grooves, so that the plate-shaped main support has alternating concave and convex shapes, which is beneficial to improving the rigidity of the main support and giving the main support a better load-bearing capacity.

[0044] A second aspect of this application provides an electrical device including any of the above-described battery devices, the battery device being used to store or provide electrical energy.

[0045] Beneficial effects

[0046] The battery device according to the embodiments of this application, by using a reinforced composite material as the outer covering material for the support body and setting a main support to support the battery cell assembly inside the cavity, achieves high strength in the housing. The mounting base is connected to the main support, and a connector passes through the bottom cover plate and the mounting base to install the bottom cover plate onto the housing. The connector is connected to the mounting base, which provides mounting support for the connector of the bottom cover plate. The load of the bottom cover plate is transferred to the mounting base through the connector and then to the main support. The main support and the mounting base jointly bear the load of the bottom cover plate, allowing the mounting base to provide good mounting support for the connector. The connector passing through the bottom cover plate and the mounting base securely installs the bottom cover plate onto the housing. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1 This is a schematic diagram showing the disassembled casing and bottom protective plate according to an embodiment of this application;

[0049] Figure 2 This is a schematic diagram of the structure of the box according to an embodiment of this application, showing the side of the box facing the bottom protective plate;

[0050] Figure 3 for Figure 2 A magnified view at position A in the middle;

[0051] Figure 4 for Figure 3 Sectional view at position BB in the middle;

[0052] Figure 5 for Figure 4 A magnified view at position C in the middle;

[0053] Figure 6This is an assembly diagram of the main support and mounting base according to an embodiment of this application. The structure shown in the diagram is the projection of the main support and mounting base along the first direction.

[0054] Figure 7 for Figure 6 A magnified view at position D in the middle;

[0055] Figure 8 for Figure 7 Sectional view at position EE in the middle;

[0056] Figure 9 for Figure 8 A magnified view at position F in the middle;

[0057] Figure 10 This is an isometric view of the main support and mounting base in their assembled state according to an embodiment of this application;

[0058] Figure 11 for Figure 10 A magnified view at position G in the middle;

[0059] Figure 12 This is a schematic diagram of the structure of the box body according to an embodiment of this application. The figure shows the side of the box body facing away from the bottom protective plate and towards the box cover.

[0060] Figure 13 for Figure 12 A cross-sectional view at position HH in the middle;

[0061] Figure 14 for Figure 13 A magnified view at position I in the middle;

[0062] Figure 15 This is an assembly diagram of the box body, box cover and bottom guard plate according to an embodiment of this application.

[0063] Explanation of reference numerals in the attached figures

[0064] 5. Battery cell assembly; 1. Mounting box; 11. Box body; 111. Support body; 1111. Expansion beam; 112. Main support; 1121. Groove; 113. Mounting seat; 1131. Main seat; 11311. Weight reduction cavity; 1132. Mounting sleeve; 1133. Hanging seat; 11331. Hanging hole; 1134. Threaded sleeve; 114. Covering layer; 1141. Receiving cavity; 1142. First covering layer; 1143. Second covering layer; 1144. Bearing part; 12. Box cover; 2. Bottom guard plate; 3. Connector; 4. Base; 41. Support platform; 42. Seat body. Detailed Implementation

[0065] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0067] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0068] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0069] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0072] In related technologies, the enclosure includes a support body and a covering layer covering the outer surface of the support body. The covering layer is made of reinforced composite material. The enclosure does not have a structure for installing connectors for mounting the bottom protective plate.

[0073] In this embodiment, the main support is used to support the battery cells and has good load-bearing capacity. The mounting base is connected to the main support, and the load borne by the mounting base can be shared by the mounting base and the main support, so that the mounting base can provide good mounting support for the connector of the bottom cover plate. The connector passing through the mounting base can be well installed on the mounting base so that the bottom cover plate can be installed into the housing.

[0074] The solutions in this application are not limited to battery devices, but can also be applied to electrical devices that include battery devices.

[0075] This application provides an electrical device, which includes a battery device, and the electrical device stores or provides electrical energy through the battery device.

[0076] In one embodiment, the electrical device further includes a device body, and a battery device is mounted on the device body to supply power to the device body.

[0077] Electrical devices are devices that use electrical energy as their energy source to perform corresponding functions by consuming electrical energy. For example, electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, space shuttles, and spacecraft, etc.

[0078] The main body of a device refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, an electrical device can be a mobile phone, where the main body is the part that enables communication and other functions, powered by individual battery cells or battery packs. Similarly, an electrical device can be a car, where the main body is the part that provides seating and allows the vehicle to move on the road, powered by individual battery cells or battery packs.

[0079] In one embodiment, the battery device may be a battery pack.

[0080] In one embodiment, the battery device can be an energy storage device.

[0081] The battery device in this application embodiment includes a single battery cell. Electrical energy is stored or released through the single battery cell.

[0082] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0083] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0084] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can 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.

[0085] 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.

[0086] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. 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 alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0088] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0089] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. 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 alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] 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.

[0091] 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.

[0092] 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. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0093] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, 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.

[0094] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0095] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0096] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0097] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0098] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0099] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0100] 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.

[0101] Liquid electrolytes include electrolyte salts and solvents.

[0102] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0103] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0104] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0105] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0106] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0107] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0108] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0109] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0110] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0111] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0112] In some implementations, the electrode assembly is a stacked structure.

[0113] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0114] 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.

[0115] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0116] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0117] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0118] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0119] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0120] For the battery device in this application embodiment, please refer to [link / reference]. Figures 1-5 ,as well as Figure 15 The battery assembly includes a battery cell assembly 5, a mounting box 1, a bottom protective plate 2, and connectors 3. The battery cell assembly 5 includes at least two battery cells. The mounting box 1 includes a box body 11 and a box cover 12 covering the box body 11. The box body 11 includes a support body 111, a main support 112, a mounting base 113, and a covering layer 114 covering the outer surface of the support body 111. The covering layer 114 is made of reinforced composite material and forms a receiving cavity 1141. The battery cells are located within the receiving cavity 1141. The main support 112 is located on the side of the covering layer 114 facing the support body 111 and is connected to the support body 111. The main support 112 is located on the side of the receiving cavity 1141 away from the box cover 12 to support the battery cell assembly 5. The mounting base 113 is connected to the main support 112. The bottom protective plate 2 is located on the side of the box body 11 away from the box cover 12. The connector 3 passes through the bottom guard plate 2 and the mounting base 113 to install the bottom guard plate 2 into the housing 11.

[0121] For example, at least two battery cells in the battery cell assembly 5 can be connected in series, in parallel, or in a hybrid configuration, where a hybrid configuration means that at least two battery cells are connected in both series and parallel configurations.

[0122] The mounting box 1 is a container mainly used to house the battery cell assembly 5. The battery cell assembly 5 is located inside the mounting box 1, and the mounting box 1 serves to protect the battery cell assembly 5.

[0123] The housing 11 is the main structure that carries the battery cells.

[0124] The cover 12 is a structure that covers the box body 11. The box body 11 and the cover 12 are manufactured independently and then assembled together. The cover 12 covers the box body 11, and the battery cell assembly 5 is located within the space enclosed by the box body 11 and the cover 12. The box body 11 and the cover 12 are manufactured independently and then assembled together, which facilitates the installation of the battery cell assembly 5 into the space enclosed by the box body 11 and the cover 12.

[0125] The covering layer 114 covers the outer surface of the support 111, and the support 111 is filled in the covering layer 114 to a certain extent to provide support for the covering layer 114.

[0126] The main support 112 is located on the side of the receiving cavity 1141 away from the cover 12 to support the battery cell assembly 5. The battery cell assembly 5 is the main load-bearing component in the battery device. The main support 112 located on the side of the receiving cavity 1141 away from the cover 12 is used to support the battery cell assembly 5 and has a good load-bearing capacity.

[0127] Mounting base 113 is the main structure for mounting bottom guard plate 2. Connector 3 passes through mounting base 113 for connection with mounting base 113.

[0128] The bottom guard plate 2 is located on the side of the box 11 away from the box cover 12. The bottom guard plate 2 protects the box 11 and reduces the possibility of the box 11 being damaged by external impact.

[0129] Reinforced composite materials consist of a matrix phase and a reinforcing phase. The matrix phase acts as a bonder, protects the reinforcing phase, and transfers stress caused by external loads to the reinforcing phase. The reinforcing phase is mainly used for load-bearing.

[0130] For example, the matrix phase can be a metal matrix, a resin matrix, or a ceramic matrix.

[0131] For example, the resin matrix can be a thermosetting resin such as epoxy resin or polyurethane.

[0132] For example, the resin matrix can be a thermoplastic resin such as nylon or polypropylene.

[0133] For example, the reinforcing phase can have various shapes, such as fibrous, granular, or flake-like.

[0134] For example, the reinforcing phase may be carbon fiber, glass fiber, aramid fiber or basalt fiber.

[0135] For example, the reinforced composite material can be a continuous fiber reinforced composite material.

[0136] For example, the bottom guard plate 2 is made of reinforced composite material or metal.

[0137] For example, the bottom guard plate 2 can be an aluminum plate.

[0138] For example, the connector 3 can be a bolt, screw, or stud.

[0139] For example, the mounting base 113 and the main support 112 are both made of metal.

[0140] For example, the mounting base 113 is welded to the main support 112.

[0141] For example, the connector 3 passes through the bottom guard plate 2, the covering layer 114 and the mounting base 113 to install the bottom guard plate 2 to the housing 11.

[0142] For example, the connector 3 passes through the bottom guard plate 2, the covering layer 114, the support body 111, the main support 112 and the mounting base 113 to install the bottom guard plate 2 to the housing 11.

[0143] For example, the mounting base 113 may be located on the side of the covering layer 114 facing the support 111, and the connector 3 passes through the covering layer 114.

[0144] For example, the mounting base 113 may be located at least partially on the side of the covering layer 114 away from the support 111, and the connector 3 may not pass through the covering layer 114.

[0145] For example, the lid 12 is made of reinforced composite material.

[0146] In this embodiment, by using a reinforced composite material covering layer 114 to cover the support body 111 and providing a main support 112 to support the battery cell assembly 5 within the receiving cavity 1141, the housing 11 achieves high strength. The mounting base 113 is connected to the main support 112. A connector 3 passes through the bottom protective plate 2 and the mounting base 113 to install the bottom protective plate 2 onto the housing 11. The connector 3 is connected to the mounting base 113, which provides mounting support for the connector 3. The load of the bottom protective plate 2 is transferred to the mounting base 113 via the connector 3 and then to the main support 112. The main support 112 and the mounting base 113 jointly bear the load of the bottom protective plate 2, allowing the mounting base 113 to provide good mounting support for the connector 3. The connector 3 passing through the bottom protective plate 2 and the mounting base 113 securely mounts the bottom protective plate 2 onto the housing 11.

[0147] In some embodiments, please refer to Figures 3-9 The mounting base 113 includes a main base 1131 and a mounting sleeve 1132. The main base 1131 has a weight-reducing cavity 11311 and is connected to the main support 112. The mounting sleeve 1132 passes through the weight-reducing cavity 11311 and is connected to the main base 1131. The connecting member 3 passes through the mounting sleeve 1132.

[0148] The main seat 1131 is the main structure of the mounting base 113. The main seat 1131 is connected to the main support 112, and the load of the mounting base 113 can be transferred to the main support 112 through the main seat 1131.

[0149] For example, the main seat 1131 is welded to the main support 112.

[0150] Mounting sleeve 1132 is a structure for mounting connector 3. Connector 3 passes through mounting sleeve 1132 to connect with mounting sleeve 1132.

[0151] For example, the mounting sleeve 1132 is cylindrical in shape.

[0152] For example, the mounting sleeve 1132 is welded to the main seat 1131.

[0153] For example, the end of the mounting sleeve 1132 that is axially away from the bottom guard plate 2 can be flush with the main seat 1131.

[0154] For example, the mounting sleeve 1132 may protrude from the main seat 1131 at one end away from the bottom guard plate 2 along the axial direction of the mounting sleeve 1132.

[0155] In this embodiment, the weight-reducing cavity 11311 of the main seat 1131 helps reduce the overall weight of the mounting base 113. The mounting sleeve 1132, which is connected to the main seat 1131, passes through the weight-reducing cavity 11311, facilitating the connection of the connector 3 near the weight-reducing cavity 11311. This provides better installation support for the connector 3 and also helps reduce the weight of the mounting base 113.

[0156] It is understood that the main structure of the mounting base 113 is not limited. For example, the mounting base 113 may not have the mounting sleeve 1132, the main base 1131 may not have the weight reduction cavity 11311, the main base 1131 may be a solid structure, and the connector 3 passes through the solid main base 1131 so that the connector 3 is installed on the main base 1131.

[0157] In some embodiments, please refer to Figures 6-9 The mounting sleeve 1132 has an internal thread, and the mounting base 113 also includes a threaded sleeve 1134, which is threadedly connected to the internal thread. The connector 3 is threadedly connected to the threaded sleeve 1134.

[0158] The threaded insert 1134 has both internal and external threads. The external thread of the threaded insert 1134 is threadedly connected to the internal thread of the mounting sleeve 1132, and the internal thread of the threaded insert 1134 is threadedly connected to the external thread of the connector 3.

[0159] For example, the threaded sleeve 1134 is made of steel, and the mounting sleeve 1132 can be made of aluminum.

[0160] In this embodiment, the threaded sleeve 1134 can protect the internal thread of the mounting sleeve 1132 to a certain extent. When the threaded sleeve 1134 is worn due to repeated disassembly and reassembly between the connector 3 and the threaded sleeve 1134, the threaded sleeve 1134 can be unscrewed from the mounting sleeve 1132 and replaced with a new threaded sleeve 1134. This makes maintenance convenient and does not require the entire mounting base 113 to be replaced, which helps to reduce maintenance costs.

[0161] It is understood that the specific structure of the mounting base 113 is not limited. For example, the mounting base 113 may not be provided with a threaded sleeve 1134, and the connecting member 3 and the internal thread of the mounting sleeve 1132 may be threaded together.

[0162] In some embodiments, please refer to Figure 4 , Figure 5 , Figure 8 and Figure 9 The support 111 partially fills the weight reduction cavity 11311, and the density of the support 111 is less than the density of the main seat 1131.

[0163] The density of support 111 is the density of the material itself.

[0164] The density of the main seat 1131 is the density of the material itself.

[0165] For example, the support 111 can be made of foam material, and the main seat 1131 can be made of metal.

[0166] For example, the material of the support 111 can be a thermosetting foam material such as polyurethane or epoxy.

[0167] For example, the material of the support 111 can be a thermoplastic foam material such as polyethylene terephthalate, polyphenylene ether, polypropylene, or nylon.

[0168] For example, the main seat 1131 can be made of aluminum.

[0169] In this embodiment of the application, the support body 111 with a lower density is filled in the weight reduction cavity 11311, which is beneficial to improving the load-bearing capacity of the main seat 1131, reducing the possibility of collapse of the weight reduction cavity 11311 of the main seat 1131, and also can reduce the weight of the main seat 1131 to a certain extent.

[0170] It is understood that the arrangement of the support 111 is not limited. For example, the support 111 may be located outside the weight reduction cavity 11311.

[0171] In some embodiments, please refer to Figure 2 , Figure 3 , Figure 7 , Figure 10 and Figure 11 The mounting base 113 also includes a hanging base 1133 connected to the main base 1131. The hanging base 1133 is a solid structure and has a mounting hole 11331 for hanging the housing 11. The mounting hole 11331 passes through the hanging base 1133.

[0172] For example, the hanging base 1133 can be integrally formed with the main base 1131.

[0173] For example, the hanging base 1133, the main base 1131 and the mounting sleeve 1132 are integrally formed.

[0174] For example, the battery device is mounted to the main body of the electrical device through the mounting hole 11331 of the hanger 1133.

[0175] For example, the battery device is mounted to the bottom of a vehicle or aircraft via the mounting hole 11331 of the mounting bracket 1133.

[0176] For example, the hanger 1133 is connected to the main support 112.

[0177] For example, the hanger 1133 is welded to the main support 112.

[0178] For example, the hanging bracket 1133 can be made of metal.

[0179] For example, the hanging bracket 1133 can be made of aluminum or steel.

[0180] In this embodiment, the battery device is mounted on the main body of the electrical device through the mounting hole 11331 of the hanging seat 1133. The overall load of the battery device is basically applied to the hanging seat 1133. The hanging seat 1133 is a solid structure, which helps to improve the load-bearing capacity of the hanging seat 1133. The load of the main body of the device acting on the hanging seat 1133 can be transferred to the main support 112 at least through the main seat 1131. The main support 112 and the hanging seat 1133 jointly bear the load applied to the hanging seat 1133 by the main body of the electrical device, which helps the hanging seat 1133 to bear the load better.

[0181] It is understood that the specific arrangement of the hanging bracket 1133 is not limited. For example, the hanging bracket 1133 is spaced a certain distance from the main bracket 1131, and the hanging bracket 1133 is spaced a certain distance from the main support 112.

[0182] In some embodiments, please refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 10 and Figure 11The arrangement direction of the box body 11 and the box cover 12 is the first direction. The receiving cavity 1141 is provided with mounting seats 113 on both sides of the second direction. The second direction is arranged intersecting the first direction. The mounting holes 11331 and the mounting sleeves 1132 are arranged along the second direction. The mounting sleeves 1132 on both sides are located between the mounting holes 11331 on both sides along the second direction.

[0183] For example, please refer to Figure 1 and Figure 13 The direction indicated by arrow R1 in the diagram is the first direction.

[0184] For example, please refer to Figure 1 , Figure 2 , Figure 6 , Figure 10 , Figure 12 and Figure 13 The direction indicated by arrow R2 in the diagram is the second direction.

[0185] For example, the first direction and the second direction are perpendicular.

[0186] For example, the box body 11 and the box cover 12 are arranged in the vertical direction.

[0187] For example, the battery device is mounted on the vehicle via mounting hole 11331, and the second direction can be the width direction of the vehicle.

[0188] In this embodiment, since the mounting holes 11331 and the mounting sleeves 1132 are arranged along the second direction, and the mounting sleeves 1132 on both sides are located between the mounting holes 11331 on both sides along the second direction, and the mounting holes 11331 on both sides are arranged outwards along the second direction, it is convenient for the structure for hanging on the main body of the electrical device to be installed between the mounting holes 11331 and the mounting sleeves 1132. Since the mounting holes 11331 and the mounting sleeves 1132 are arranged along the second direction, and the mounting sleeves 1132 on both sides are located between the mounting holes 11331 on both sides along the second direction, and the mounting sleeves 1132 on both sides are arranged inwards along the second direction, the connecting piece 3 of the mounting base plate 2 can be well connected to the mounting sleeves 1132 near the inward position along the second direction. While basically meeting the installation requirements of the base plate 2, the laying area of ​​the base plate 2 can be reduced as much as possible.

[0189] It is understood that the arrangement of the mounting holes 11331 and the mounting sleeves 1132 is not limited. Exemplarily, the mounting holes 11331 and the mounting sleeves 1132 are arranged along the second direction, and the mounting holes 11331 on both sides can be located between the mounting sleeves 1132 on both sides along the second direction. Exemplarily, the arrangement directions of the mounting holes 11331 and the mounting sleeves 1132 are respectively intersecting the first direction and the second direction. Exemplarily, the arrangement directions of the mounting holes 11331 and the mounting sleeves 1132 are respectively perpendicular to the first direction and the second direction.

[0190] In some embodiments, please refer to Figure 1 , Figure 12 and Figure 13 The support 111 has expansion beams 1111. Expansion beams 1111 are provided on both sides of the battery cell assembly 5. The expansion beams 1111 on both sides are arranged in a third direction, which is intersected with the first direction and the second direction respectively.

[0191] For example, the two expansion beams 1111 abut against the battery cell assembly 5 along the arrangement direction of the two expansion beams 1111.

[0192] For example, the arrangement direction of the two expansion beams 1111 is intersected with the large surface of the battery cells between the two expansion beams 1111.

[0193] For example, the arrangement direction of the two expansion beams 1111 is perpendicular to the large surface of the battery cell between the two expansion beams 1111.

[0194] For example, please refer to Figure 1 , Figure 2 , Figure 6 , Figure 10 ,as well as Figures 12-13 The direction indicated by arrow R3 in the diagram is the third direction.

[0195] Expansion beams 1111 are provided on both sides of the battery cell assembly 5. During normal operation of the battery cell in the battery cell assembly 5, the battery cell may expand. The expansion beams 1111 on both sides constrain the battery cell in the battery cell assembly 5 along the arrangement direction of the expansion beams 1111 on both sides. The expansion beams 1111 on both sides apply a reaction force to the battery cell assembly 5 to suppress battery expansion.

[0196] For example, the third direction is perpendicular to the first direction and the second direction, respectively.

[0197] For example, the electrical device is a vehicle, the second direction is the width direction of the vehicle, and the third direction is the length direction of the vehicle.

[0198] In this embodiment, the second direction, i.e. the arrangement direction of the mounting bases 113 on both sides, is also the arrangement direction of the mounting holes 11331 on both sides. The battery device is mainly suspended on the main body of the device along the opposite sides of the second direction. The arrangement direction of the expansion beams 1111 on both sides is the third direction. The third direction is arranged to intersect with the first direction and the second direction, so that the arrangement direction of the expansion beams 1111 on both sides and the arrangement direction of the mounting holes 11331 on both sides are in two different directions. The torque formed by the load borne by the battery device at the mounting holes 11331 on both sides has little effect on the force exerted by the expansion beams 1111 on the battery cell assembly 5 to suppress expansion.

[0199] It is understood that the arrangement of the mounting holes 11331 on both sides is not limited. For example, the second direction can be parallel to the third direction.

[0200] In some embodiments, please refer to Figures 12-14 The support 111 has an expansion beam 1111. Expansion beams 1111 are provided on both sides of the battery cell assembly 5. The battery device also includes a base 4. Each side of the expansion beam 1111 is connected to the base 4 on the side away from the cover 12 along the arrangement direction of the box 11 and the cover 12. The base 4 is connected to the main support 112.

[0201] For example, the base 4 can be made of metal, and the main support 112 can be made of metal.

[0202] For example, the base 4 can be made of aluminum, and the main support 112 can be made of aluminum.

[0203] For example, the base 4 is welded to the main support 112.

[0204] For example, please refer to Figure 1 and Figure 13 The box body 11 and the box cover 12 are arranged in the direction shown by arrow R1 in the figure.

[0205] Each expansion beam 1111 is connected to a base 4 on the side away from the cover 12 along the arrangement direction of the box body 11 and the cover 12. The base 4 is connected to the main support 112, that is, the base 4 is connected between the expansion beam 1111 and the main support 112.

[0206] In this embodiment, the base 4 is connected between the expansion beam 1111 and the main support 112. When the battery cell of the battery device expands during normal operation and exerts an expansion force on the expansion beam 1111, the load borne by the expansion beam 1111 can be transferred to the main support 112 through the base 4. The expansion beam 1111, the base 4 and the main support 112 jointly bear the expansion force of the battery cell assembly 5, so that the expansion beam 1111 can bear the load well, which is beneficial to better suppress the expansion of the battery cell assembly 5.

[0207] It is understood that the arrangement of the expansion beam 1111 is not limited. For example, the battery device may not have a base 4.

[0208] In some embodiments, please refer to Figures 12-14 The projection area of ​​the battery cell assembly 5 is projected along the arrangement direction of the expansion beams 1111 on both sides, and spans the projection area of ​​the base 4 and the projection area of ​​the expansion beams 1111 along the arrangement direction of the box body 11 and the box cover 12.

[0209] For example, please refer to the figure. Figure 1 , Figure 2 , Figure 6 , Figure 10 and 12~ Figure 14 The expansion beams 1111 on both sides are arranged in the direction shown by arrow R3 in the figure.

[0210] The projection area of ​​the battery cell assembly 5 spans the projection area of ​​the base 4 and the projection area of ​​the expansion beam 1111 along the arrangement direction of the housing 11 and the cover 12. The projection area of ​​the battery cell assembly 5 overlaps with the projection area of ​​the base 4 as the first area, and the projection area of ​​the battery cell assembly 5 overlaps with the projection area of ​​the expansion beam 1111 as the second area. The arrangement direction of the first area and the second area is parallel to the arrangement direction of the housing 11 and the cover 12.

[0211] In this embodiment, the expansion force of the battery cells in the battery cell assembly 5 acts on the corresponding position of the covering layer 114. Since the projection area of ​​the battery cell assembly 5 spans the projection area of ​​the base 4 and the projection area of ​​the expansion beam 1111 along the arrangement direction of the housing 11 and the cover 12, part of the expansion force at the corresponding position of the covering layer 114 is transmitted to the expansion beam 1111 and then to the base 4 via the expansion beam 1111. Part of the expansion force on the covering layer 114 is directly transmitted to the base 4, reducing the load borne by the expansion beam 1111 and reducing the possibility of the expansion beam 1111 being misaligned relative to the base 4 under the action of the expansion force. The structure formed by the expansion beam 1111 and the base 4 has greater rigidity, which improves the ability of the structure formed by the expansion beam 1111 and the base 4 to resist the expansion deformation of the battery cells.

[0212] It is understood that the specific structure of the battery device is not limited. Exemplarily, projecting along the arrangement direction of the two expansion beams 1111, the projected area of ​​the battery cell assembly 5 at least partially overlaps with the projected area of ​​the expansion beams 1111, and the projected area of ​​the battery cell assembly 5 is spaced apart from the projected area of ​​the base 4. Exemplarily, the base 4 may be omitted, and the projected area of ​​the battery cell assembly 5 may be located within the projected area of ​​the expansion beams 1111 when projected along the arrangement direction of the two expansion beams 1111.

[0213] In some embodiments, please refer to Figure 14 The base 4 includes a platform 41 and a seat 42. The platform 41 is connected to the side of the expansion beam 1111 opposite to the cover 12 along the arrangement direction of the housing 11 and the cover 12. Projected along the arrangement direction of the two expansion beams 1111, the projection area of ​​the battery cell assembly 5 spans across the projection area of ​​the platform 41 and the projection area of ​​the expansion beam 1111 along the arrangement direction of the housing 11 and the cover 12. The seat 42 is connected to the side of the platform 41 opposite to the cover 12 along the arrangement direction of the housing 11 and the cover 12. Projected along the arrangement direction of the two expansion beams 1111, the projection area of ​​the battery cell assembly 5 is offset from the projection area of ​​the seat 42.

[0214] Projecting along the arrangement direction of the expansion beams 1111 on both sides, the projection area of ​​the battery cell assembly 5 spans the projection area of ​​the support platform 41 and the projection area of ​​the expansion beams 1111 along the arrangement direction of the housing 11 and the cover 12. The first area is the area where the projection area of ​​the battery cell overlaps with the projection area of ​​the support platform 41. The arrangement direction of the first area and the second area is parallel to the arrangement direction of the housing 11 and the cover 12.

[0215] Projecting along the arrangement direction of the expansion beams 1111 on both sides, the projection area of ​​the battery cell assembly 5 is offset from the projection area of ​​the base 42, and the projection areas of the battery cell and the base 42 do not overlap.

[0216] For example, when projecting along the arrangement direction of the expansion beams 1111 on both sides, the projection area of ​​the battery cell and the projection area of ​​the base 42 are separated by a certain distance, so that the projection area of ​​the battery cell assembly 5 is offset from the projection area of ​​the base 42.

[0217] For example, when projected along the arrangement direction of the two expansion beams 1111, the outer contour of the projection area of ​​the battery cell and the outer contour of the projection area of ​​the base 42 can at least partially contact each other, but the projection areas of the battery cell and the projection areas of the base 42 do not overlap.

[0218] For example, please refer to Figure 1 and Figure 14 The covering layer 114 has a support portion 1144, which covers the outer surface of the expansion beam 1111 and is located between the battery cell assembly 5 and the expansion beam 1111.

[0219] For example, both the base 42 and the main support 112 are made of metal.

[0220] For example, both the base 42 and the main support 112 are made of aluminum.

[0221] For example, the base 42 is welded to the main support 112.

[0222] For example, the support 41 and the base 42 are integrally formed.

[0223] For example, when projected along the arrangement direction of the housing 11 and the cover 12, the projection area of ​​the platform 41 is located within the projection area of ​​the base 42.

[0224] In this embodiment, part of the expansion force of the battery cell assembly 5 during normal operation is transmitted to the support platform 41 through the covering layer 114 and the expansion beam 1111. Part of the expansion force of the battery cell assembly 5 during normal operation is directly transmitted to the support platform 41 through the covering layer 114, reducing the load on the expansion beam 1111 and lowering the possibility of misalignment of the expansion beam 1111 relative to the base 4 under the action of expansion force. Since the projection area of ​​the base 42 is offset from the projection area of ​​the battery cell, the impact of the battery cell assembly 5 on the spatial arrangement of the base 42 is minimal, and the shape and size of the base 42 can be set according to actual needs. Through the positional arrangement between the support platform 41, the base 42, and the battery cell assembly 5, the base 4 can both roughly meet the load-bearing requirements of the expansion force of the battery cell assembly 5 and allow the shape and size of the base 42 to meet actual needs, resulting in flexible arrangement.

[0225] It is understood that the specific structure of the base 4 is not limited. For example, the base 4 may not have a seat 42, and the base 4's platform 41 may be connected to the main support 112.

[0226] In some embodiments, please refer to Figure 14 Both the base 42 and the platform 41 are hollow structures. The support 111 is partially located inside the base 42 and partially located within the space enclosed by the base 42 and the platform 41. The density of the base 42 and the platform 41 are both greater than the density of the support 111.

[0227] The density of seat 42 is the density of the material itself.

[0228] The density of foundation 41 is the density of the material itself.

[0229] The density of support 111 is the density of the material itself.

[0230] In this embodiment, by filling the space within the seat 42 and the space enclosed by the seat 42 and the platform 41 with a support body 111 of low density, the base 4 can better bear the load while reducing weight.

[0231] In some embodiments, the base 4 is made of metal.

[0232] In this embodiment, the metal base 4 can better support the expansion force of the battery cell assembly 5.

[0233] In some embodiments, the mounting base 113 is made of metal, and / or the main support 112 is made of metal.

[0234] For example, the mounting base 113 is made of metal.

[0235] For example, the main support 112 is made of metal.

[0236] For example, the mounting base 113 is made of metal, and the main support 112 is made of metal.

[0237] For example, the mounting base 113 is welded to the main support 112.

[0238] In this embodiment, the metal mounting base 113 facilitates the installation of the connector 3 of the bottom protective plate 2, and the metal main support 112 gives the main support 112 good load-bearing capacity.

[0239] In some embodiments, the support 111 is made of foam material.

[0240] For example, the foaming material can be a thermosetting foaming material such as polyurethane or epoxy.

[0241] For example, the foaming material can be a thermoplastic foaming material such as polyethylene terephthalate, polyphenylene ether, polypropylene, or nylon.

[0242] In this embodiment, the foam material has a low density. The material of the support 111 is foam material, which can reduce the weight and provide support for the box 11 to a certain extent.

[0243] In some embodiments, the support 111 is made of reinforced composite material.

[0244] In this embodiment, the support 111 is made of reinforced composite material, which helps to improve the overall strength of the box 11.

[0245] In some embodiments, the main support 112 is plate-shaped, and grooves 1121 are formed on both sides of the main support 112 along the arrangement direction of the box body 11 and the box cover 12. The number of grooves 1121 is at least two, and the at least two grooves 1121 are arranged in sequence. The grooves 1121 on both sides are alternately arranged along the arrangement direction of the at least two grooves 1121.

[0246] For example, please refer to Figures 6-8 ,as well as Figure 10 At least two grooves 1121 are arranged in the direction shown by arrow R3 in the figure.

[0247] For example, the main support 112, which is plate-shaped, is bent into shape.

[0248] For example, the main support 112 can be formed by splicing together multiple plates.

[0249] For example, please refer to Figures 6-10 The groove 1121 is U-shaped.

[0250] For example, the groove 1121 is V-shaped.

[0251] In this embodiment, the grooves 1121 on both sides are arranged alternately along the arrangement direction of at least two grooves 1121, so that the plate-shaped main support 112 is alternately concave and convex, which is beneficial to improving the rigidity of the main support 112 and giving the main support 112 a better load-bearing capacity.

[0252] In some embodiments, please refer to Figure 14 The covering layer 114 includes a first covering layer 1142 and a second covering layer 1143. The first covering layer 1142 surrounds a receiving cavity 1141, and the material of the first covering layer 1142 is a reinforced composite material, with glass fiber as the reinforcing phase. The support 111 is located within the space surrounded by the first covering layer 1142 and the second covering layer 1143, and the material of the second covering layer 1143 is a reinforced composite material, with carbon fiber as the reinforcing phase.

[0253] For example, the bottom cover 2 is in contact with the second cover 1143.

[0254] For example, the connector 3 for mounting the bottom cover plate 2 passes through the second cover 1143.

[0255] For example, the support portion 1144 is formed on the first cover layer 1142.

[0256] In this embodiment, the first cladding layer 1142 surrounds a receiving cavity 1141. The battery cell assembly 5 located within the receiving cavity 1141 is close to, and may even contact, the first cladding layer 1142. The reinforcing phase of the first cladding layer 1142 is glass fiber, which gives it good insulation properties, thus facilitating insulation of the battery cells within the receiving cavity 1141. The reinforcing phase of the second cladding layer 1143 is carbon fiber, giving it high strength and reducing weight.

[0257] It is understood that the specific structure of the coating layer is not limited. For example, the entire coating layer is made of the same reinforced composite material.

[0258] In some embodiments, please refer to Figures 1 to 14The electrical device includes a main body and a battery unit mounted on the main body, which stores or provides electrical energy. The battery cell assembly 5 includes at least two battery cells. The mounting box 1 includes a box body 11 and a cover 12 covering the box body 11. The box body 11 includes a support 111, a main support 112, a mounting base 113, and a covering layer 114 covering the outer surface of the support 111. The covering layer 114 is made of reinforced composite material and forms a cavity 1141. The battery cells are located within the cavity 1141. The main support 112 is located on the side of the covering layer 114 facing the support 111 and is connected to the support 111. The main support 112 is located on the side of the cavity 1141 away from the cover 12 to support the battery cell assembly 5. The mounting base 113 is connected to the main support 112. The bottom protective plate 2 is located on the side of the box body 11 away from the cover 12. Connector 3 passes through the bottom guard plate 2 and mounting base 113 to install the bottom guard plate 2 onto the housing 11. The support body 111 is made of foam material. The main support 112 and mounting base 113 are both made of metal, and the mounting base 113 is welded to the main support 112. The main support 112 is plate-shaped, and grooves 1121 are formed on both opposite sides of the main support 112 along the arrangement direction of the housing 11 and the cover 12. There are at least two grooves 1121, which are arranged sequentially, and the grooves 1121 on both sides are alternately arranged along the arrangement direction of the at least two grooves 1121. The mounting base 113 includes a main base 1131 and a mounting sleeve 1132. The main base 1131 has a weight-reducing cavity 11311, and the main base 1131 is connected to the main support 112. Mounting sleeve 1132 passes through weight reduction cavity 11311 and is connected to main seat 1131. Connector 3 passes through mounting sleeve 1132. Mounting sleeve 1132 has internal thread. Mounting seat 113 also includes threaded sleeve 1134, which is threaded to the internal thread. Connector 3 is threaded to threaded sleeve 1134. Covering layer 114 includes first cover layer 1142 and second cover layer 1143. First cover layer 1142 surrounds receiving cavity 1141. The material of first cover layer 1142 is reinforced composite material, and the reinforcing phase of first cover layer 1142 is glass fiber. Support 111 is located within the space surrounded by first cover layer 1142 and second cover layer 1143. The material of second cover layer 1143 is reinforced composite material, and the reinforcing phase of second cover layer 1143 is carbon fiber. The first coating 1142 and the second coating 1143 are both made of continuous fiber reinforced composite material. The reinforcing phase of the continuous fiber reinforced composite material is fibrous. The reinforcing phase of the continuous fiber reinforced composite material can be carbon fiber, glass fiber, aramid fiber or basalt fiber, etc. The matrix phase of the continuous fiber reinforced composite material is resin. The resin used as the basic phase of the continuous fiber reinforced composite material can be epoxy resin, polyurethane or other thermosetting resins, or nylon, polypropylene or other thermoplastic resins.The support 111 is made of foam material, which can be a thermosetting foam such as polyurethane or epoxy, or a thermoplastic foam such as polyethylene terephthalate, polyphenylene ether, polypropylene, or nylon. The mounting base 113 can be made of metal, and the main support 112 can be made of aluminum plate or other sheet metal. The main support 112 is formed by stamping or bending, and the mounting base 113 is welded or riveted to the main support 112. The main support 112 is plate-shaped, and grooves 1121 are formed on both opposite sides of the main support 112 along the arrangement direction of the housing 11 and the cover 12. There are at least two grooves 1121, arranged sequentially, with the grooves 1121 on both sides alternating along the arrangement direction of the at least two grooves 1121. The alternating arrangement of the grooves 1121 gives the main support 112 a wavy plate-like structure. A smooth, gently transitioning surface is formed by filling and composite with a support body 111 made of foamed material, facilitating the laying and molding of the covering layer 114. The support body 111 has expansion beams 1111, with expansion beams 1111 on both opposite sides of the battery cell assembly 5. The battery device also includes a base 4. Each side of the expansion beam 1111 is connected to the base 4 on the side opposite to the cover 12 along the arrangement direction of the housing 11 and the cover 12. The base 4 is connected to the main support 112. Projecting along the arrangement direction of the expansion beams 1111 on both sides, the projection area of ​​the battery cell assembly 5 spans across the projection area of ​​the base 4 and the projection area of ​​the expansion beams 1111 along the arrangement direction of the housing 11 and the cover 12.

[0259] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly, comprising at least two battery cells; The mounting box includes a box body and a box cover covering the box body. The box body includes a support body, a main support, a mounting base, and a covering layer covering the outer surface of the support body. The covering layer is made of reinforced composite material. The covering layer surrounds a receiving cavity. The battery cell is located in the receiving cavity. The main support is located on the side of the covering layer facing the support body. The main support is connected to the support body. The main support is located on the side of the receiving cavity away from the box cover to support the battery cell assembly. The mounting base is connected to the main support. The bottom protective plate is located on the side of the box body away from the box cover; A connector is provided through the bottom guard plate and the mounting base to install the bottom guard plate into the housing.

2. The battery device according to claim 1, characterized in that, The mounting base includes: The main seat has a weight-reducing cavity, and the main seat is connected to the main support. An installation sleeve is inserted into the weight reduction cavity, the installation sleeve is connected to the main seat, and the connecting member is inserted into the installation sleeve.

3. The battery device according to claim 2, characterized in that, The mounting sleeve has an internal thread, and the mounting base also includes a threaded sleeve. The threaded sleeve is threadedly connected to the internal thread, and the connecting member is threadedly connected to the threaded sleeve.

4. The battery device according to claim 2, characterized in that, The support partially fills the weight-reducing cavity, and the density of the support is less than the density of the main seat.

5. The battery device according to claim 2, characterized in that, The mounting base also includes a hanging bracket connected to the main base. The hanging bracket is a solid structure and has a mounting hole for suspending the housing. The mounting hole extends through the hanging bracket.

6. The battery device according to claim 5, characterized in that, The arrangement direction of the box body and the box cover is the first direction. The mounting base is provided on both sides of the receiving cavity along the second direction. The second direction is arranged intersecting the first direction. The mounting holes and the mounting sleeves are arranged along the second direction. The mounting sleeves on both sides are located between the mounting holes on both sides along the second direction.

7. The battery device according to claim 6, characterized in that, The support has expansion beams, and expansion beams are provided on both sides of the battery cell assembly. The expansion beams on both sides are arranged in a third direction, which intersects with the first direction and the second direction respectively.

8. The battery device according to claim 1, characterized in that, The support has expansion beams, and expansion beams are provided on both sides of the battery cell assembly. The battery device also includes a base. The expansion beams on each side are connected to the base on the side away from the cover along the arrangement direction of the housing and the cover. The base is connected to the main support.

9. The battery device according to claim 8, characterized in that, Projecting along the arrangement direction of the expansion beams on both sides, the projection area of ​​the battery cell assembly spans the projection area of ​​the base and the projection area of ​​the expansion beams along the arrangement direction of the housing and the cover.

10. The battery device according to claim 9, characterized in that, The base includes: A support platform is connected to the side of the expansion beam opposite to the box cover along the arrangement direction of the box body and the box cover. The projection area of ​​the battery cell assembly spans the projection area of ​​the support platform and the projection area of ​​the expansion beam along the arrangement direction of the box body and the box cover. The base is connected to the side of the platform opposite to the box cover along the arrangement direction of the box body and the box cover. The base is connected to the main support and is projected along the arrangement direction of the expansion beams on both sides. The projection area of ​​the battery cell assembly is offset from the projection area of ​​the base.

11. The battery device according to claim 10, characterized in that, Both the base and the platform are hollow structures. The support is partially located inside the base and partially located within the space enclosed by the base and the platform. The density of the base and the platform are both greater than the density of the support.

12. The battery device according to claim 8, characterized in that, The base is made of metal.

13. The battery device according to any one of claims 1 to 12, characterized in that, The mounting base is made of metal, and / or the main support is made of metal.

14. The battery device according to any one of claims 1 to 12, characterized in that, The support is made of foamed material or reinforced composite material.

15. The battery device according to any one of claims 1 to 12, characterized in that, The main support is plate-shaped, and grooves are formed on both sides of the main support along the arrangement direction of the box body and the box cover. There are at least two grooves, and the at least two grooves are arranged sequentially. The grooves on both sides are arranged alternately along the arrangement direction of the at least two grooves.

16. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1 to 15, the battery device being used to store or provide electrical energy.

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