Battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery device, a power utilization device and an energy storage device. The use performance of the battery device can be improved. The battery device comprises at least two battery cells; the box body comprises at least two sub-box bodies, each sub-box body comprises a hollow structure with an opening at one end, and the single batteries are accommodated in the hollow structures; wherein the box body is made of a hard insulating material, and the at least two battery monomers are in one-to-one correspondence with the at least two sub-box bodies.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and more particularly, to a battery device, a power utilization device, and an energy storage device. BACKGROUND

[0002] In the development of battery technology, in addition to improving the electrical performance of the battery device, the insulation performance is also a problem that cannot be ignored. If the insulation consistency between different battery monomers in the battery device cannot be guaranteed, the battery device is difficult to use normally, and the use performance of the battery device is reduced. Therefore, how to improve the use performance of the battery device has become a technical problem to be solved in the field. SUMMARY

[0003] The embodiments of the present application provide a battery device, a power utilization device, and an energy storage device, which can improve the use performance of the battery device.

[0004] In a first aspect, the present application provides a battery device, comprising: at least two battery monomers; a box body comprising at least two sub-box bodies, the sub-box body comprising a hollow structure having an opening at one end, and the battery monomer being accommodated in the hollow structure; wherein the material of the box body is a hard insulating material, and the at least two battery monomers correspond to the at least two sub-box bodies one by one.

[0005] In the embodiments of the present application, by providing a box body in the battery device, the box body comprises at least two sub-box bodies, the sub-box body comprises a hollow structure having an opening at one end, the battery monomer is accommodated in the hollow structure, the material of the box body is a hard insulating material, and the at least two battery monomers correspond to the at least two sub-box bodies one by one, the insulation performance of the battery monomer can be improved while the insulation consistency between different battery monomers is improved, so as to meet the insulation performance requirements in different scenarios, thereby improving the use performance of the battery device.

[0006] In some embodiments, the opening covers the orthographic projection of the battery monomer towards the opening.

[0007] In the embodiments of the present application, by setting the opening to cover the orthographic projection of the battery monomer towards the opening, the battery monomer can be smoothly assembled into the inside of the hollow structure, so as to improve the assembly performance of the battery device.

[0008] In some embodiments, the shape of the orthographic projection of the battery monomer towards the opening is the same as the shape of the opening.

[0009] In the embodiment of the present application, the shape of the positive projection of the battery cell towards the opening is set to be the same as the shape of the opening, so as to facilitate the processing and manufacturing of the sub-box body, and at the same time, the battery cell can be smoothly assembled into the hollow structure, so as to improve the assembly performance and manufacturing performance of the battery device.

[0010] In some embodiments, the openings of the at least two sub-box bodies are oriented in the same direction. In this way, in the embodiment of the present application, by setting the openings of the at least two sub-box bodies to be oriented in the same direction, the battery cell can be smoothly assembled into the hollow structure, while reducing the processing and manufacturing cost of the box body, so as to take into account the assembly performance and manufacturing performance of the battery device.

[0011] In some embodiments, the side walls of any two adjacent sub-box bodies of the at least two sub-box bodies are connected by adhesive connection or rivet connection.

[0012] In the embodiment of the present application, by setting the side walls of any two adjacent sub-box bodies of the at least two sub-box bodies to be connected by adhesive connection or rivet connection, the structural strength and manufacturing cost of the box body are taken into account, thereby improving the use performance of the battery device.

[0013] In some embodiments, the battery device further comprises a filling component for filling the gap between the battery cell and the hollow structure.

[0014] In the embodiment of the present application, by setting the battery device to further comprise a filling component, and the filling component is used to fill the gap between the battery cell and the hollow structure, so as to reduce the risk of the battery cell in the sub-box body shaking or colliding under different working conditions, thereby improving the use performance of the battery device.

[0015] In some embodiments, the material of the filling component is silicone grease. In this way, in the embodiment of the present application, by setting the material of the filling component to be silicone, since the silicone is an insulating material, it can reduce the risk of the battery cell in the sub-box body shaking or colliding under different working conditions, while not affecting the insulation performance of the battery device, thereby improving the use performance of the battery device.

[0016] In some embodiments, the battery device further comprises a support component accommodated in the hollow structure, and the support component abuts against the surface of the battery cell on the side facing the opening.

[0017] In the embodiment of the present application, by setting the battery device to further comprise a support component accommodated in the hollow structure, and the support component abuts against the surface of the battery cell on the side facing the opening, the risk of the battery cell in the sub-box body shaking or colliding under different working conditions is effectively reduced, thereby improving the use performance of the battery device.

[0018] In some embodiments, the support component has a projection towards the opening that overlaps the opening.

[0019] In the embodiments of the present application, by setting the projection of the support component towards the opening to overlap the opening, the support component and the hollow structure form a sealed containing cavity containing the battery monomer, reducing the risk of external impurities falling onto the surface of the side of the battery monomer facing the opening, thereby improving the use performance of the battery device.

[0020] In some embodiments, the box is integrally formed by stamping. In this way, in the embodiments of the present application, by integrally forming the box by stamping, the structural strength and manufacturing performance of the box are taken into account, thereby improving the use performance of the battery device.

[0021] In some embodiments, the hard insulating material is one of: ceramic material, epoxy resin, polyvinyl chloride, polystyrene.

[0022] In the embodiments of the present application, by setting the hard insulating material to be one of: ceramic material, epoxy resin, polyvinyl chloride, polystyrene, the insulating performance of the box is effectively improved to meet the insulating performance requirements in different scenarios, thereby improving the use performance of the battery device.

[0023] In a second aspect, a power consuming device is provided, comprising the battery device of the first aspect, and the battery device is configured to provide power for the power consuming device.

[0024] In some implementations, the power consuming device can be a vehicle, a ship, or a spacecraft, etc.

[0025] In a third aspect, an energy storage device is provided, comprising the battery device of the first aspect, and the battery device is configured to store power for the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0027] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application.

[0028] Figure 2 is an exploded structural schematic diagram of a battery monomer provided by an embodiment of the present application.

[0029] Figure 3This is an exploded structural diagram of a battery cell provided in another embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the box provided in one embodiment of this application.

[0031] Figure 5 This is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in an embodiment of this application.

[0032] Figure 6 This is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in another embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 50-Box; 21-Shell; 22-Electrode assembly; 211-Housing; 212-End cap; 213-Pressure relief mechanism; 222-Taper; 222a-Positive electrode tab; 222b-Negative electrode tab; 214-Electrode terminal; 214a-Positive electrode terminal; 214b-Negative electrode terminal; 23-Connecting member; 215-First wall; 510-Sub-box; 520-Opening; 530-Hollow structure; 540-Filling component; 550-Supporting component.

[0034] The accompanying drawings are not drawn to scale. Detailed Implementation

[0035] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0038] Reference within this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" means that X employs A or B or both. The term "a" or "an" is defined as one or more unless explicitly indicated to the contrary or otherwise evident from the context. The term "plurality" is defined as two or more unless explicitly indicated to the contrary or otherwise evident from the context.

[0039] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0040] In this application, the term "and / or", only describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

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

[0042] "Multiple" appearing in this application refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] If not specifically stated, all embodiments and optional embodiments of the application can be combined with each other to form new technical solutions.

[0044] If not specifically stated, all technical features and optional technical features of the application can be combined with each other to form new technical solutions.

[0045] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0046] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is provided on either one or both of the two surfaces of the positive electrode current collector.

[0047] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0048] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, and the like. When the foam metal is employed as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, and of course, can be provided with the positive electrode active material. As an example, the positive electrode active material is filled or / and deposited within the foam metal.

[0049] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0050] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0051] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0052] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two surfaces of the negative electrode current collector.

[0053] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone or in combination of two or more.

[0054] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the foamed metal surface can not be provided with a negative active material, or can be provided with a negative active material.

[0055] As an example, the negative active material can be filled or / and deposited in the negative current collector.

[0056] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0057] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0058] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0059] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive electrode and the negative electrode, or can be attached to the surface of the positive electrode and the negative electrode. An inorganic particle coating layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0060] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0061] In some embodiments, the battery cell further comprises an electrolyte, which functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not specifically limited in the present application and can be selected as needed. The electrolyte can be liquid, gel, or solid.

[0062] In some embodiments, the electrolyte is a liquid electrolyte. The liquid electrolyte can comprise an electrolyte salt and a solvent.

[0063] In some embodiments, the electrolyte can further optionally comprise an additive. For example, the additive can comprise a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive capable of improving certain properties of the battery cell, such as an additive capable of improving overcharge / fast charge performance, an additive capable of improving high-temperature performance, an additive capable of improving low-temperature performance, and the like.

[0064] In some embodiments, the electrolyte is a gel electrolyte. The gel electrolyte can comprise a polymer as a backbone network and can be used in combination with an ionic liquid-lithium salt.

[0065] In some embodiments, the electrolyte is a solid electrolyte. The solid electrolyte can comprise a polymer solid electrolyte, an inorganic solid electrolyte, or a composite solid electrolyte.

[0066] As an example, the polymer of the polymer solid electrolyte can comprise a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0067] As an example, the inorganic solid electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0068] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0069] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0070] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a stacked structure.

[0072] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0073] As an example, the positive electrode sheet can be provided in a plurality of pieces, and the negative electrode sheet can be folded to form a plurality of folded sections arranged in layers.

[0074] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded sections arranged in layers.

[0075] As an example, a plurality of separators can be provided, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0076] As an example, a separator can be continuously provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0077] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0078] In some embodiments, the electrode assembly can be provided with tabs, which can guide current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0079] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., a polypropylene housing), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly, the sealing bag being configured to encapsulate the electrode assembly and an electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the housing is configured to encapsulate the electrode assembly and the electrolyte.

[0080] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell having another shape. The prismatic battery cell can include a square battery cell, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), etc.

[0081] In some embodiments, at least one electrode terminal can be provided on the housing, and the electrode terminal can be electrically connected to the tabs. The electrode terminal can be directly connected to the tabs or indirectly connected to the tabs via a current collector. The electrode terminal can be provided on an end cap or on the housing.

[0082] In some embodiments, a pressure relief mechanism can be provided on the housing. The pressure relief mechanism can be configured to discharge internal gas of the battery cell.

[0083] As an example, the internal pressure or temperature of the battery cell reaches a predetermined threshold value, and the pressure relief mechanism is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold value, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0084] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0085] As an example, the pressure relief mechanism can also be provided separately from the housing and connected.

[0086] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0087] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell.

[0088] The discharge from the battery cell mentioned in the present application includes, but is not limited to, the electrolyte, the dissolved or split positive and negative plates, the fragments of the separator, the high-temperature and high-pressure gas generated by the reaction, the flame, and the like.

[0089] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar.

[0090] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0091] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0092] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0093] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0094] As an example, the battery cell assembly can also be accommodated in the case by fixing a plurality of battery cells directly in the case.

[0095] As an example, the case can include a first case and a second case. The first case and the second case are fastened so that an enclosed space is formed inside the case to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0096] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, respectively, so that an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0097] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0098] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0099] The embodiments of the present application provide a power storage device including one or more battery clusters to improve the voltage and capacity of the power storage device. The battery cluster can include a plurality of battery devices connected in series by a busbar component to improve the voltage of the power storage device. When the power storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the power storage device.

[0100] The power storage device can be used in a power storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The power storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the power storage device can store electrical energy during a low electricity usage period and provide electrical energy to related users or electric devices during a high electricity usage period. The power storage system provided by the embodiments of the present application can be any power system that needs to use a power storage device.

[0101] In some embodiments, the power storage device is a power storage container or a power storage cabinet.

[0102] In some embodiments, the power storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0103] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, a fire control module, and the like.

[0104] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid to each battery device through a pipeline for adjusting the temperature of the battery monomer.

[0105] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, and the like of the battery cluster can be controlled. The master control module includes an auxiliary battery management unit, a fusion switch, and the like.

[0106] As an example, the general control module can serve as a battery management unit of the energy storage device for monitoring and managing the energy storage device. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current, voltage, and the like of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module, a main battery management unit, an Ethernet and optical fiber conversion module, and the like.

[0107] As an example, the fire control system includes a control panel, a detector, an alarm device, and the like for detecting, alarming, or extinguishing the energy storage system.

[0108] As an example, the power distribution device can be used to distribute power to the power consumption module of the energy storage device.

[0109] In the development process of battery technology, in addition to improving the electrical performance of the battery device, the insulation performance is also a problem that cannot be ignored. If the insulation consistency between different battery monomers in the battery device cannot be guaranteed, the battery device will be difficult to use normally, and the use performance of the battery device is reduced. For example, the battery device applied to the energy storage system, the battery device is usually provided with tens of thousands or even hundreds of thousands of battery monomers inside, and at present, an insulation layer is usually arranged on the outer surface of the battery monomer. Due to the influence of the process, the insulation consistency between different battery monomers is difficult to guarantee, which will seriously affect the use performance of the battery device. Therefore, how to improve the use performance of the battery device has become a technical problem to be solved in the field.

[0110] Therefore, the battery device, the power utilization device and the energy storage device provided in the embodiments of the present application can improve the insulation performance of the battery monomer and the insulation consistency between different battery monomers, so as to meet the insulation performance requirement in different scenarios, thereby improving the use performance of the battery device.

[0111] The technical solutions described in the embodiments of the present application are suitable for various power utilization devices using the battery device.

[0112] The power utilization device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above power utilization devices.

[0113] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above described power utilization devices, but also can be applied to all devices using batteries. The following embodiments will be described in detail by taking the power utilization device as a vehicle for example.

[0114] For example, as shown in FIG. 1, the vehicle 100 includes a battery device 110, a motor 120, a controller 130, a power utilization device 140 and a power supply device 150. The battery device 110 is connected to the motor 120, and the motor 120 is connected to the power utilization device 140. The power supply device 150 is connected to the controller 130, and the controller 130 is connected to the battery device 110, the motor 120 and the power utilization device 140. Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle 1 can be provided with a motor 40, a controller 30 and a battery device 10. The controller 30 is used to control the power supply of the battery device 10 to the motor 40. For example, the battery device 10 can be arranged at the bottom, the front or the rear of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power source of the vehicle 1, which is used for the circuit system of the vehicle 1, for example, for the power demand of the vehicle 1 during starting, navigation and operation. In another embodiment of the present application, the battery device 10 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, which can replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0115] In order to meet different power demands, the battery device 10 according to an embodiment of the present application can include at least two battery cell assemblies, each of which includes a plurality of battery cells. The plurality of battery cells can be electrically connected in series, in parallel or in a hybrid manner to form the battery device 10. The hybrid manner refers to a mixture of series connection and parallel connection. The battery device 10 can also be referred to as a battery pack. For example, the plurality of battery cells can be connected in series, in parallel or in a hybrid manner to form a battery module, and the plurality of battery modules can be connected in series, in parallel or in a hybrid manner to form the battery device 10. That is, the plurality of battery cells can be directly connected to form the battery device 10, or the plurality of battery cells can be connected to form a battery module, and then the battery module can be connected to form the battery device 10.

[0116] Figure 2 As shown, it is a structural schematic diagram of a battery cell 20 according to an embodiment of the present application, Figure 3 As shown, it is an exploded structural schematic diagram of a battery cell 20 according to another embodiment of the present application. As shown in Figure 2 and Figure 3 As shown, the battery cell 20 according to an embodiment of the present application can include an outer shell 21 and an electrode assembly 22. The outer shell 21 has a closed accommodation space, and the electrode assembly 22 is arranged in the accommodation space of the outer shell 21. The outer shell 21 can include a shell body 211 and an end cover 212. The shell body 211 is a hollow structure having at least one opening. The end cover 212 is used to be buckled with the shell body 211 to form the outer shell 21 having a closed accommodation space.

[0117] It should be understood that the battery cell 20 in the embodiments of the present application can be a secondary battery, which refers to a battery cell 20 that can be activated by charging after discharging. Exemplarily, the battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0118] The electrode assembly 22 in the embodiments of the present application includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging of the battery cell 20, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator disposed between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0119] In some embodiments, the end cover 212 can be a plate-shaped structure for covering the opening of the shell 211. In other embodiments, the end cover 212 has a similar structure to the shell 211, i.e., the shell 211 and the end cover 212 are both hollow structures with one opening, and the two openings are connected to form an outer shell 21 with a closed accommodation space.

[0120] It should be understood that if the end cover 212 is a plate-shaped structure, the shell 211 can be a hollow structure with one or more openings, for example, if the shell 211 is a hollow structure with one opening at one end, the end cover 212 can be provided as one; if the shell 211 is a hollow structure with openings at opposite ends, the end cover 212 can be provided as two, and the two end covers 212 cover the openings at the two ends of the shell 211, respectively.

[0121] The outer shell 21 can have various shapes, such as a cylinder, a cuboid, or other polyhedrons. Exemplarily, as shown in Figure 2 and Figure 3 In the embodiments of the present application, the outer shell 21 is mainly described as a cuboid structure.

[0122] It should be understood that the end cover 212 in the embodiments of the present application is used to cooperate with the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cover 212 can be adapted to the shape of the shell 211, as shown in Figure 2 and Figure 3 The shell 211 is a cuboid structure, and the end cover 212 is a rectangular plate-shaped structure adapted to the shell 211.

[0123] In some embodiments, the shell 211 can be a hollow structure with an opening formed at at least one end, and the end cover 212 can be shaped to match the shape of the shell 211, and the end cover 212 is used to cover the opening of the shell 211, so that the outer shell 21 isolates the internal environment of the battery monomer 20 from the external environment. If the shell 211 is a hollow structure with an opening formed at one end, the end cover 212 can be provided as one.

[0124] The material of the shell 211 of the embodiments of the present application can include one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 212 can also be one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. Among them, the material of the end cover 212 and the material of the shell 211 can be the same or different; the materials of the different walls of the shell 211 can also be the same or different.

[0125] The end cover 212 of the embodiments of the present application can be any wall of the outer shell 21, for example, the end cover 212 can be the largest wall among the multiple walls included in the outer shell 21, or the smallest wall, or it can also be other walls, the embodiments of the present application are not limited thereto. Alternatively, the end cover 212 can also be other structures, for example, the end cover 212 can also be a groove structure with an opening to cover the opening of the shell 211, the embodiments of the present application are not limited thereto.

[0126] It should be understood that the battery monomer 20 also includes an electrode terminal 214. The electrode terminal 214 of the embodiments of the present application is used to be electrically connected with the electrode assembly 22 inside the battery monomer 20 to output the electric energy of the battery monomer 20. As shown in Figure 2 and Figure 3 The battery monomer 20 can include at least one electrode terminal 214, which can include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b, the positive electrode terminal 214a is used to be electrically connected with the positive tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used to be electrically connected with the negative tab 222b of the electrode assembly 22. The positive electrode terminal 214a can be directly connected with the positive tab 222a, and the negative electrode terminal 214b can be directly connected with the negative tab 222b. For example, the positive electrode terminal 214a can be electrically connected with the positive tab 222a through a connecting member 23, and the negative electrode terminal 214b can be electrically connected with the negative tab 222b through a connecting member 23. It should be understood that in the embodiments of the present application, the positive tab 222a and the negative tab 222b can be collectively referred to as a tab 222.

[0127] In the embodiments of the present application, the walls of the shell 211 and the walls of the end cover 212 are collectively referred to as the walls of the battery monomer 20, wherein for Figure 2 andFigure 3 The rectangular parallelepiped battery cell 20 shown in FIG. 1 includes a housing 211 and a cover 212. The walls of the housing 211 include a bottom wall and four side walls. The housing 211 is shaped according to the shape of the one or more electrode assemblies 22 combined, for example, the housing 211 can be a hollow rectangular parallelepiped or a hollow cube or a hollow cylinder, and one of the faces of the housing 211 has an opening so that the one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow rectangular parallelepiped or a hollow cube, one of the flat faces of the housing 211 is an open face, i.e., the flat face does not have a wall so that the inside of the housing 211 is in communication with the outside. When the housing 211 can be a hollow cylinder, one of the end faces of the housing 211 is an open face, i.e., the end face does not have a wall so that the inside of the housing 211 is in communication with the outside. The cover 212 covers the opening and is connected to the housing 211 to form a closed cavity in which the electrode assembly 22 is placed. The housing 211 is filled with an electrolyte, such as an electrolytic solution.

[0128] In the battery cell 20, the electrode assembly 22 is the component in which electrochemical reactions occur in the battery cell 20. According to actual use requirements, the electrode assembly 22 inside the housing 211 can be one or multiple. For example, as shown in FIG. 1, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a rectangular parallelepiped, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a rectangular parallelepiped structure, the housing 211 can also be a rectangular parallelepiped structure. Figure 3 In the battery cell 20, the electrode assembly 22 is the component in which electrochemical reactions occur in the battery cell 20. According to actual use requirements, the electrode assembly 22 inside the housing 211 can be one or multiple. For example, as shown in FIG. 1, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a rectangular parallelepiped, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a rectangular parallelepiped structure, the housing 211 can also be a rectangular parallelepiped structure.

[0129] Figure 4 In the battery cell 20, the electrode assembly 22 is the component in which electrochemical reactions occur in the battery cell 20. According to actual use requirements, the electrode assembly 22 inside the housing 211 can be one or multiple. For example, as shown in FIG. 1, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a rectangular parallelepiped, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a rectangular parallelepiped structure, the housing 211 can also be a rectangular parallelepiped structure.

[0130] A pressure relief mechanism 213 can also be provided on the battery cell 20. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0131] ​The pressure relief mechanism 213 provided on the battery cell 20 can be various possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism configured to be able to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0132] In some implementations, an insulating member can also be provided in the battery cell 20, which is arranged in the accommodation space of the shell 211, and the insulating member can be a hollow structure with one end or multiple ends open, and the accommodation space in the hollow structure is used to accommodate the electrode assembly 22 to improve the insulation performance of the battery cell 20.

[0133] Figures 2 to 4 A structural schematic diagram of the box 50 provided by an embodiment of the present application is shown.

[0134] In some implementations, as shown in Figure 5 The battery device 10 includes at least two battery cells 20 and a box 50, the box 50 includes at least two sub-boxes 510, the sub-box 510 includes a hollow structure 530 with an opening 520 at one end, and the battery cell 20 is accommodated in the hollow structure 530, wherein the material of the box 50 is a hard insulating material, and at least two battery cells 20 correspond to at least two sub-boxes 510 one by one.

[0135] It should be understood that the box 50 can include at least two sub-boxes 510, and the arrangement of the at least two sub-boxes 510 can be set according to actual needs. For example, in the case that the battery device 10 is applied to an energy storage device, the at least two sub-boxes 510 can be arranged according to the shape of the space of the energy storage device. It should also be understood that the shape of the sub-box 510 can be set according to actual needs. For example, in the plane perpendicular to the height direction of the sub-box 510, the shape of the sub-box 510 can be set as a circle, a square, or a polygon, etc. Specifically, the shape of the sub-box 510 can be set according to the shape of the battery cell 20.

[0136] It should also be understood that the material of the box 50 being a hard insulating material can mean that the box 50 is processed by taking the hard insulating material as raw material. For example, the box 50 can be integrally formed or separately formed. In the case that the box 50 is separately formed, the adjacent two sub-boxes 510 can be adhesively connected. It should also be understood that the hard insulating material in the embodiments of the present application means a material that simultaneously has high mechanical strength, rigidity, and excellent electrical insulation performance.

[0137] It should also be understood that the shape of the opening 520 at one end of the sub-box 510 can be set according to actual needs. For example, the shape of the opening 520 can be matched to the shape of the battery monomer 20, such as a circular or square shape.

[0138] It should also be understood that the one-to-one correspondence between the battery monomer 20 and the sub-box 510 in the embodiment of the application means that the hollow structure 530 of the sub-box 510 can accommodate one battery monomer 20. Specifically, the battery monomer 20 can be assembled into the hollow structure 530 through the opening 520 of the sub-box 510.

[0139] In the embodiment of the application, by providing the battery device 10 with a box 50, the box 50 includes at least two sub-boxes 510, the sub-box 510 includes a hollow structure 530 with an opening 520 at one end, the battery monomer 20 is accommodated in the hollow structure 530, the material of the box 50 is a hard insulating material, and at least two battery monomers 20 correspond to at least two sub-boxes 510. The insulation performance of the battery monomer 20 can be improved while the insulation consistency between different battery monomers 20 is improved to meet the insulation performance requirements in different scenarios, thereby improving the use performance of the battery device 10.

[0140] In some implementations, the opening 520 covers the orthographic projection of the battery monomer 20 towards the opening 520.

[0141] It should be understood that the opening 520 covering the orthographic projection of the battery monomer 20 towards the opening 520 can mean that the area of the opening 520 on the plane where the opening 520 is located can cover the area of the orthographic projection of the battery monomer 20 towards the opening 520.

[0142] In the embodiment of the application, by setting the opening 520 to cover the orthographic projection of the battery monomer 20 towards the opening 520, the battery monomer 20 can be smoothly assembled into the interior of the hollow structure 530, thereby improving the assembly performance of the battery device 10.

[0143] In some implementations, the shape of the orthographic projection of the battery monomer 20 towards the opening 520 is the same as the shape of the opening 520.

[0144] For example, when the battery monomer 20 is a cylindrical battery monomer 20, the shape of the opening 520 can be set as a circle, or when the battery monomer 20 is a square battery monomer 20, the shape of the opening 520 can be correspondingly set as a square.

[0145] In the embodiments of the present application, the shape of the orthographic projection of the battery cell 20 towards the opening 520 is set to be the same as the shape of the opening 520, so as to facilitate the processing and manufacturing of the sub-box body 510, and meanwhile, the battery cell 20 can be smoothly assembled into the hollow structure 530, so as to improve the assembly performance and manufacturing performance of the battery device 10.

[0146] In some implementations, the openings 520 of the at least two sub-box bodies 510 are towards the same direction.

[0147] For example, the openings 520 of the at least two sub-box bodies 510 can be towards the height direction of the battery device 10, so as to facilitate the assembly of the battery cell 20 into the hollow structure 530 of the sub-box body 510.

[0148] In the embodiments of the present application, by setting the openings 520 of the at least two sub-box bodies 510 to be towards the same direction, the battery cell 20 can be smoothly assembled into the hollow structure 530, and meanwhile, the processing and manufacturing cost of the box body 50 is reduced, so as to take into account the assembly performance and manufacturing performance of the battery device 10.

[0149] In some implementations, the side walls of any two adjacent sub-box bodies 510 among the at least two sub-box bodies 510 are connected by adhesive connection or rivet connection.

[0150] For example, the side walls of any two adjacent sub-box bodies 510 among the at least two sub-box bodies 510 can be connected by adhesive connection or rivet connection, so as to form the box body 50.

[0151] In the embodiments of the present application, by setting the side walls of any two adjacent sub-box bodies 510 among the at least two sub-box bodies 510 to be connected by adhesive connection or rivet connection, the structural strength and manufacturing cost of the box body 50 are taken into account, so as to improve the use performance of the battery device 10.

[0152] Figure 5 A cross-sectional schematic view of part of the structure of the battery device 10 provided by an embodiment of the present application is shown.

[0153] In some implementations, as shown in Figure 6 The battery device 10 further includes a filling component 540 for filling the gap between the battery cell 20 and the hollow structure 530.

[0154] It should be understood that during the assembly of the battery device 10, the filling component 540 may be coated or bonded to the surface of the battery cell 20 away from its interior, so that as the battery cell 20 is received into the hollow structure 530 through the opening 520, the battery cell 20 is in close contact with the inner wall of the hollow structure 530 facing the battery cell, so as to fix the battery cell 20 inside the hollow structure 530.

[0155] In this embodiment of the application, by configuring the battery device 10 to also include a filling component 540, and the filling component 540 is used to fill the gap between the battery cell 20 and the hollow structure 530, the risk of the battery cell 20 in the sub-box 510 shaking or colliding under different operating conditions is reduced, thereby improving the performance of the battery device 10.

[0156] In some implementations, the filling component 540 is made of silicone grease.

[0157] It should be understood that when the material of the filling component 540 is set as silicone grease, the gap between the battery cell 20 and the hollow structure 530 is filled without affecting the insulation performance and performance of the battery device 10, thereby reducing the risk of the battery cell 20 in the sub-box 510 shaking or colliding under different operating conditions.

[0158] In this embodiment, by setting the material of the filling component 540 to silicone, since silicone is an insulating material, it can reduce the risk of the battery cell 20 in the sub-box 510 shaking or colliding under different operating conditions, without affecting the insulation performance of the battery device 10, thereby improving the performance of the battery device 10.

[0159] Figure 6 A cross-sectional schematic diagram of a portion of the structure of a battery device 10 provided in another embodiment of this application is shown.

[0160] In some implementations, such as Figure 1 As shown, the battery device 10 also includes a support member 550 housed in the hollow structure 530, the support member 550 abutting against the surface of the battery cell 20 facing the opening 520.

[0161] It should be understood that the support member 550 abutting against the surface of the battery cell 20 facing the opening 520 can mean that the support member 550 is in direct contact or bonded to the surface of the battery cell 20 facing the opening 520.

[0162] It should also be understood that the support member 550 being accommodated in the hollow structure 530 can mean that the support member 550 is in direct contact with or fixedly connected to the inner wall of the hollow structure 530. For example, in the case where the battery cell 20 is assembled into the hollow structure 530 through the opening 520, the support member 550 can be placed on the surface of the battery cell 20 on the side facing the opening 520.

[0163] For example, in the case where the opening 520 of the sub-box 510 faces the height direction of the battery device 10, for example, the opening 520 faces the opposite direction of the gravity direction, the support member 550 being accommodated in the hollow structure 530 can mean that the support member 550 does not protrude from the plane on the side of the opening 520 away from the battery cell 20.

[0164] It should also be understood that the shape of the support member 550 in the embodiments of the present application can be set according to actual needs, for example, the shape of the support member 550 can be matched and set according to the shape of the opening 520. It should also be understood that the material of the support member 550 can be the same as the material of the box 50, so as to reduce the processing and manufacturing cost of the battery device 10.

[0165] In the embodiments of the present application, by setting the battery device 10 to further include the support member 550 accommodated in the hollow structure 530, and the support member 550 abutting against the surface of the battery cell 20 on the side facing the opening 520, the risk of the battery cell 20 in the sub-box 510 shaking or colliding under different working conditions can be effectively reduced, so as to improve the use performance of the battery device 10.

[0166] In some implementations, the orthographic projection of the support member 550 toward the opening 520 and the opening 520 overlap each other.

[0167] It should be understood that the orthographic projection of the support member 550 toward the opening 520 and the opening 520 overlap each other can mean that, on the plane where the opening 520 is located, the shape of the support member 550 is the same as the shape of the opening 520.

[0168] In the embodiments of the present application, by setting the orthographic projection of the support member 550 toward the opening 520 to overlap the opening 520, the support member 550 and the hollow structure 530 form a sealed accommodation cavity for accommodating the battery cell 20, the risk of external impurities falling onto the surface of the battery cell 20 on the side facing the opening 520 is reduced, and thus the use performance of the battery device 10 is improved.

[0169] In some implementations, the box 50 is integrally formed by stamping.

[0170] It should be understood that the box 50 can be integrally stamped to form a plurality of sub-boxes 510, so as to effectively reduce the manufacturing cost of the box of the battery device 10, improve the production efficiency of the battery device 10, and improve the size accuracy and structural consistency of the plurality of sub-boxes 510.

[0171] In the embodiments of the present application, the box 50 is integrally stamped to take into account the structural strength and manufacturing performance of the box 50, thereby improving the use performance of the battery device 10.

[0172] In some implementations, the hard insulating material is one of: a ceramic material, an epoxy resin, polyvinyl chloride, polystyrene. In this way, in the embodiments of the present application, the hard insulating material is set to one of: a ceramic material, an epoxy resin, polyvinyl chloride, polystyrene, so as to effectively improve the insulation performance of the box 50, to meet the insulation performance requirements in different scenarios, thereby improving the use performance of the battery device 10.

[0173] According to some embodiments of the present application, the embodiments of the present application also provide a power utilization device, which comprises the battery device 10 in any of the above embodiments, and the battery device 10 is used to provide power for the power utilization device. Specifically, the power utilization device can be the vehicle 1 as shown in the above Figures 2 to 6 , or any power utilization device using the battery device 10.

[0174] The power utilization device can be any of the above-mentioned devices or systems using the battery device 10.

[0175] According to some embodiments of the present application, the embodiments of the present application also provide an energy storage device, which comprises the battery device 10 in any of the above embodiments, and the battery device 10 is used to store power for the energy storage device.

[0176] According to some embodiments of the present application, referring to ​The application provides a battery device 10, the battery device 10 comprising: at least two battery cells 20 and a box 50, the box 50 comprising at least two sub-boxes 510, the sub-box 510 comprising a hollow structure 530 with an opening 520 at one end, the battery cell 20 being accommodated in the hollow structure 530, wherein the material of the box 50 is a hard insulating material, and the at least two battery cells 20 correspond to the at least two sub-boxes 510 one by one. The opening 520 covers the orthographic projection of the battery cell 20 towards the opening 520. The shape of the orthographic projection of the battery cell 20 towards the opening 520 is the same as the shape of the opening 520. The battery device 10 further comprises a filling component 540 for filling the gap between the battery cell 20 and the hollow structure 530. The battery device 10 further comprises a supporting component 550 accommodated in the hollow structure 530, the supporting component 550 abutting against the surface of the battery cell 20 on the side towards the opening 520.

[0177] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: At least two battery cells (20); The housing (50) includes at least two sub-housing units (510), each sub-housing unit (510) including a hollow structure (530) having an opening (520) at one end, and the battery cell (20) is housed in the hollow structure (530). The casing (50) is made of rigid insulating material, and at least two battery cells (20) correspond one-to-one with at least two sub-casings (510).

2. The battery device according to claim 1, characterized in that, The opening (520) covers the orthographic projection of the battery cell (20) toward the opening (520).

3. The battery device according to claim 2, characterized in that, The shape of the positive projection of the battery cell (20) toward the opening (520) is the same as the shape of the opening (520).

4. The battery device according to claim 1, characterized in that, The openings (520) of at least two of the sub-boxes (510) face the same direction.

5. The battery device according to claim 1, characterized in that, The sidewalls of any two adjacent sub-boxes (510) are connected by adhesive or riveting.

6. The battery device according to claim 1, characterized in that, The battery device further includes a filling component (540) for filling the gap between the battery cell (20) and the hollow structure (530).

7. The battery device according to claim 6, characterized in that, The filling component (540) is made of silicone grease.

8. The battery device according to claim 1, characterized in that, The battery device further includes a support member (550) housed in the hollow structure (530), the support member (550) abutting against the surface of the battery cell (20) facing the opening (520).

9. The battery device according to claim 8, characterized in that, The orthographic projection of the support member (550) toward the opening (520) overlaps with the opening (520).

10. The battery device according to claim 1, characterized in that, The box body (50) is formed by integral stamping.

11. The battery device according to any one of claims 1 to 10, characterized in that, The rigid insulating material is one of the following: ceramic material, epoxy resin, polyvinyl chloride, or polystyrene.

12. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 11, wherein the battery device is used to provide electrical energy to the electrical device.

13. An energy storage device, characterized in that, include: The battery device according to any one of claims 1 to 11, wherein the battery device is used to store electrical energy for the energy storage device.

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