Battery monomer, battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The use performance of the battery monomer can be improved. The battery cell comprises: a housing comprising an accommodating cavity and a first wall; the electrode assembly is accommodated in the accommodating cavity; an insulating structure is arranged on the first surface, away from the accommodating cavity, of the first wall; the insulation structure comprises a first insulation layer and a first insulation structure, the first insulation structure is arranged on the surface of the side, away from the containing cavity, of the first insulation layer and comprises a metal shielding layer and a second insulation layer, and the second insulation layer is arranged on the surface of the side, away from the first insulation layer, of the metal shielding layer.

Description

TECHNICAL FIELD

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

[0002] With the increase of the access voltage level of the energy storage device, higher requirements are put forward for the insulation performance of the battery monomer inside the energy storage device. If the insulation performance of the battery monomer cannot be guaranteed, the battery monomer is difficult to use normally, and the use performance of the battery monomer is reduced. Therefore, how to improve the insulation performance of the battery monomer has become a technical problem to be solved in the art. CONTENT OF THE INVENTION

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

[0004] In a first aspect, the present application provides a battery monomer, comprising: a shell comprising a containing cavity and a first wall; an electrode assembly contained in the containing cavity; a first surface of the first wall away from the containing cavity is provided with an insulation structure; the insulation structure comprises a first insulation layer and a first insulation structure, the first insulation structure is arranged on a surface of the first insulation layer away from the containing cavity, and the first insulation structure comprises a metal shielding layer and a second insulation layer, the second insulation layer is arranged on a surface of the metal shielding layer away from the first insulation layer.

[0005] In the embodiments of the present application, the first surface of the first wall away from the containing cavity is provided with an insulation structure, the insulation structure comprises a first insulation layer and a first insulation structure, the first insulation structure is arranged on a surface of the first insulation layer away from the containing cavity, and the first insulation structure comprises a metal shielding layer and a second insulation layer, the second insulation layer is arranged on a surface of the metal shielding layer away from the first insulation layer. Compared with the technical solution in the prior art in which only the first insulation layer is arranged on the first surface, the insulation performance of the battery monomer can be improved to meet the use requirements in a high-voltage use scenario, thereby improving the use performance of the battery monomer.

[0006] In some embodiments, the number of the first insulation structures is N, the Nth metal shielding layer in the Nth first insulation structure is formed on a surface of the N-1th second insulation layer in the N-1th first insulation structure away from the first wall, and N is an integer greater than or equal to 2.

[0007] In the embodiment of the present application, by setting the number of the first insulation structures to N, and the Nth metal shielding layer in the Nth first insulation structure is formed on the surface of the N-1th second insulation layer in the N-1th first insulation structure away from the first wall, that is, the first surface can be provided with a plurality of first insulation structures, so as to effectively meet the use requirements in different high-voltage use scenarios, thereby improving the use performance of the battery monomer.

[0008] In some embodiments, the minimum size D1 of the insulation structure in the thickness direction of the first wall satisfies: 150 μm≤D1≤200 μm. In this way, in the embodiment of the present application, by setting the minimum size D1 of the insulation structure in the thickness direction of the first wall to satisfy: 150 μm≤D1≤200 μm, the energy density and insulation performance of the battery monomer are taken into account, thereby improving the use performance of the battery monomer.

[0009] In some embodiments, in the plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first insulation structure covers the orthographic projection of the first insulation layer.

[0010] In the embodiment of the present application, in the plane perpendicular to the thickness direction of the first wall, by setting the orthographic projection of the first insulation structure to cover the orthographic projection of the first insulation layer, the insulation performance of the battery monomer is further improved to meet the use requirements in different high-voltage use scenarios, thereby improving the use performance of the battery monomer.

[0011] In some embodiments, the material of the metal shielding layer is one of: aluminum, copper, nickel, silver. In this way, in the embodiment of the present application, by setting the material of the metal shielding layer to be one of: aluminum, copper, nickel, silver, the second insulation layer can be smoothly formed on the surface of the metal shielding layer away from the first insulation layer, thereby improving the insulation performance of the battery monomer.

[0012] In some embodiments, the battery monomer further comprises a filling structure for filling the recessed area of the first surface.

[0013] In the embodiment of the present application, by setting the battery monomer to further comprise a filling structure for filling the recessed area of the first surface, the influence of the recessed area of the first surface on the insulation performance of the battery monomer is reduced, and at the same time, the first insulation layer can be smoothly formed on the first surface, thereby improving the insulation performance of the battery monomer.

[0014] In some embodiments, the material of the filling structure is silicone grease or a semiconductor material. In this way, in the embodiment of the present application, by setting the material of the filling structure to be silicone grease or a semiconductor material, the insulation performance and manufacturing cost of the battery monomer are taken into account, thereby improving the use performance of the battery monomer.

[0015] In some embodiments, the material of the first insulating layer and / or the second insulating layer is one of: polyimide, polytetrafluoroethylene, polyethylene terephthalate, and epoxy resin.

[0016] In the embodiments of the present application, the material of the first insulating layer and / or the second insulating layer is set to polyimide, polytetrafluoroethylene, polyethylene terephthalate, and epoxy resin, so as to balance the insulation performance and manufacturing cost of the battery monomer, thereby improving the use performance of the battery monomer.

[0017] In some embodiments, the first insulating layer is formed on the first surface by an electrophoretic plating process, and the second insulating layer is formed on the surface of the metal shielding layer away from the first insulating layer by an electrophoretic plating process.

[0018] In the embodiments of the present application, the first insulating layer is formed on the first surface by an electrophoretic plating process, and the second insulating layer is formed on the surface of the metal shielding layer away from the first insulating layer by an electrophoretic plating process, so as to improve the uniformity and stability of the first insulating layer and the second insulating layer, while reducing the processing and manufacturing cost of the battery monomer, thereby improving the insulation performance and use performance of the battery monomer.

[0019] In some embodiments, the first wall is a bottom wall of the battery monomer in the height direction of the battery monomer.

[0020] In the embodiments of the present application, the first wall is set to be a bottom wall of the battery monomer in the height direction of the battery monomer, so as to reduce the risk of short circuit caused by direct contact of the bottom wall of the battery monomer with other components, thereby improving the insulation performance of the area where the bottom wall of the battery monomer is located, and improving the use performance of the battery monomer.

[0021] In a second aspect, a battery device is provided, comprising: a plurality of battery monomers, the battery monomer being the battery monomer in the first aspect or any of the implementation manners thereof.

[0022] In a third aspect, a power consumption device is provided, comprising the battery device in the second aspect, and the battery device is configured to provide electric energy for the power consumption device.

[0023] In some implementation manners, the power consumption device can be a vehicle, a ship, or a spacecraft, etc.

[0024] In a fourth aspect, an energy storage device is provided, comprising the battery device in the second aspect, and the battery device is configured to store electric energy for the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0025] 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 as follows. Obviously, the drawings described below only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0026] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application.

[0027] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application.

[0028] Figure 3 is an exploded structural schematic diagram of a battery monomer provided by an embodiment of the present application.

[0029] Figure 4 is an exploded structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0030] Figure 5 is a sectional schematic diagram of a partial structure of a battery monomer provided by an embodiment of the present application.

[0031] Figure 6 is a sectional schematic diagram of a partial structure of a battery monomer provided by another embodiment of the present application.

[0032] Figure 7 is a sectional schematic diagram of a partial structure of a battery monomer provided by another embodiment of the present application.

[0033] BRIEF DESCRIPTION OF DRAWINGS 1-vehicle; 10-battery device; 20-battery monomer; 30-controller; 40-motor; 11-box body; 111-first structure; 112-second structure; 112a-bottom plate; 112b-side plate; 21-outer shell; 22-electrode assembly; 211-housing; 212-end cover; 213-pressure relief mechanism; 222-tab; 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; 50-accommodation cavity; 60-insulating structure; 610-first insulating layer; 620-first insulating structure; 621-metal shielding layer; 622-second insulating layer; 70-first surface; 80-filling structure; 90-recessed area.

[0034] In the drawings, the drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the description of the present application and the claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description of the present application and the claims or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0038] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiments, nor is it necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, the term "and / or" is only a description of the association relationship between 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 the present application generally represents an "or" relationship between the associated objects before and after it.

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

[0042] In the present application, "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0043] If not specifically stated, all embodiments and optional embodiments of the present 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 present 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 opposite surfaces in the thickness direction of itself, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0047] As an example, the positive electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, surface-treated metals, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be used. 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, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0048] In some embodiments, the positive electrode can adopt 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 the positive electrode, the surface of the foamed metal can not be provided with the positive electrode active material, of course, the positive electrode active material can also be provided. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

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

[0050] As an example, the negative current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a 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, etc. 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, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

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

[0052] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative 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, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a 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 only one 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 surface of the foamed metal can not be provided with a negative active material, and of course, can be provided with a negative active material.

[0055] As an example, the negative active material can be filled and / or 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 separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0059] For 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. 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 and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating 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 and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

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

[0062] The liquid electrolyte includes an electrolyte salt and a solvent.

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

[0064] The gel electrolyte includes a polymer as a backbone network, and can be used in combination with an ionic liquid-lithium salt.

[0065] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

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

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

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

[0069] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound 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 the 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, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0073] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0074] As an example, both the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

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

[0076] As an example, the separators can be continuously provided, and can be provided between any adjacent positive electrode sheets or negative electrode sheets 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. The tabs can guide current from the electrode assembly. The tabs 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., polypropylene), a composite metal housing (e.g., 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 is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the 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 sealing bag is used to encapsulate the electrode assembly and the electrolyte, etc.

[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 of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), etc., without specific limitation in the present application.

[0081] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the housing.

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

[0083] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, 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 to the housing.

[0086] As used herein, "actuation" of a pressure relief mechanism refers to the pressure relief mechanism being activated or moved to a state in which the internal pressure and temperature of a battery cell can be released. The movement of the pressure relief mechanism can include, but is not limited to, movement of a component of the pressure relief mechanism to form a venting path, at least a portion of the pressure relief mechanism rupturing, breaking, tearing, or opening, and the like. Upon actuation of the pressure relief mechanism, the high temperature and pressure material inside the battery cell can be expelled as a discharge from the actuated portion. In this manner, the battery cell can be depressurized and cooled in a controlled manner to avoid a potentially more severe accident.

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

[0088] As used herein, the discharge from a battery cell can include, but is not limited to, electrolyte, dissolved or broken positive and negative electrode sheets, fragments of separators, high temperature and pressure gases generated by reactions, flames, and the like.

[0089] A battery device as used herein can include one or more battery cell assemblies for providing voltage and capacity. A 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, a battery cell assembly is generally formed by arranging a plurality of battery cells.

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

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

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

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

[0095] As an example, the housing can include a first housing and a second housing. The first housing and the second housing are coupled to form an enclosed space inside the housing for receiving the battery cell assembly. Enclosed as used herein refers to covered or closed, which can be sealed or non-sealed. The first housing can be a top cover or a bottom plate.

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

[0097] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, part of the box can be at least part of a floor of the vehicle, or part of the box 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 monomers, 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 an energy storage device including one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

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

[0101] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

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

[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, and a fire-fighting module, etc.

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

[0105] As an example, the master control module can be 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 and voltage of the battery cluster can be controlled. The master control module includes an auxiliary battery management unit, a fuse module, etc.

[0106] As an example, the general control module can be used as a battery management unit of the energy storage device to monitor and manage 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, to detect, alarm, or extinguish the energy storage system.

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

[0109] With the increase of the access voltage level of the energy storage device, higher requirements are put forward for the insulation performance of the battery monomer inside the energy storage device. If the insulation performance of the battery monomer cannot be guaranteed, the battery monomer will be difficult to use normally, and the use performance of the battery monomer will be reduced. For example, usually, an insulating layer is formed on the outer surface of the battery monomer by an electrophoretic plating process. Due to the limitation of the electrophoretic plating process, there is a certain thickness threshold for the thickness of the formed insulating layer, which is difficult to meet the current insulation demand under high voltage. Therefore, how to improve the insulation performance of the battery monomer has become a technical problem to be solved in the field.

[0110] Therefore, the embodiments of the present application provide a battery monomer, a battery device, a power device, and an energy storage device. The battery monomer comprises: a shell and an electrode assembly, the shell comprises a containing cavity and a first wall, the electrode assembly is contained in the containing cavity, and a first surface of the first wall away from the containing cavity is provided with an insulation structure. The insulation structure comprises a first insulating layer and a first insulation structure, the first insulation structure is arranged on a surface of the first insulating layer away from the containing cavity, the first insulation structure comprises a metal shielding layer and a second insulating layer, and the second insulating layer is arranged on a surface of the metal shielding layer away from the first insulating layer. In this way, in the embodiments of the present application, by arranging the insulation structure on the first surface of the first wall away from the containing cavity, the insulation structure comprises the first insulating layer and the first insulation structure, the first insulation structure is arranged on the surface of the first insulating layer away from the containing cavity, the first insulation structure comprises the metal shielding layer and the second insulating layer, and the second insulating layer is arranged on the surface of the metal shielding layer away from the first insulating layer, compared with the technical solution of arranging only the first insulating layer on the first surface in the prior art, the insulation performance of the battery monomer can be improved to meet the use demand under the high voltage use scenario, thereby improving the use performance of the battery monomer.

[0111] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0112] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0113] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0114] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0115] To meet different power demands, the battery device 10 in the embodiments of the present application can include at least one battery cell assembly, which includes a plurality of battery cells. The plurality of battery cells can be electrically connected in series, in parallel, or in a hybrid connection to form the battery device 10, where the hybrid connection refers to a mixture of series and parallel connections. The battery device 10 can also be referred to as a battery pack. For example, the plurality of battery cells can first be connected in series, in parallel, or in a hybrid connection to form a battery module, and the plurality of battery modules can then be connected in series, in parallel, or in a hybrid connection 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 first connected to form a battery module, and then the battery module can be connected to form the battery device 10.

[0116] For example, as shown in FIG. 1, which is a structural schematic diagram of a battery device 10 according to an embodiment of the present application, the battery device 10 can include a plurality of battery cells 20. The battery device 10 can also include a box 11 (or a cover), which has a hollow structure inside. The plurality of battery cells 20 can be accommodated in the box 11. For example, the plurality of battery cells 20 can be combined in parallel, in series, or in a hybrid connection and then placed in the box 11. Figure 2

[0117] As shown in FIG. 2, the box 11 can include two parts, which are referred to as a first structure 111 and a second structure 112, respectively. The first structure 111 and the second structure 112 are buckled together. The shapes of the first structure 111 and the second structure 112 can be determined according to the shape of the combination of the plurality of battery cells 20. The first structure 111 and the second structure 112 can each have an opening. For example, the first structure 111 and the second structure 112 can each be a hollow cuboid and have only one face as an opening face. The opening of the first structure 111 and the opening of the second structure 112 are oppositely arranged, and the first structure 111 and the second structure 112 are buckled together to form the box 11 with a closed cavity. The second structure 112 can include a bottom plate 112a, a side plate 112b, and a beam. The plurality of battery cells 20 can be combined in parallel, in series, or in a hybrid connection and then placed in the box 11 formed by buckling the first structure 111 and the second structure 112. Figure 2

[0118] Optionally, the battery device 10 can also include other structures, which will not be described one by one here. For example, the battery device 10 can also include a current collection component, which is used to achieve electrical connection between the plurality of battery cells 20, such as parallel connection, series connection, or hybrid connection. Specifically, the current collection component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the current collection component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can be further led out through the box by a conductive mechanism. Optionally, the conductive mechanism can also belong to the current collection component.

[0119] ​​The number of battery cells 20 can be set to any value according to different power requirements. A plurality of battery cells 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery cells 20 included in each battery device 10 can be large, in order to facilitate installation, the battery cells 20 can be grouped and set, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements.

[0120] In the embodiments of the present application, the number of battery cells 20 can be set to any value according to different power requirements. A plurality of battery cells 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery cells 20 included in each battery device 10 can be large, in order to facilitate installation, the battery cells 20 can be grouped and set, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements. The battery device 10 can include a plurality of battery modules, and the battery modules can be connected in series, parallel or mixed connection.

[0121] Figure 3 A structural schematic diagram of the battery cell 20 provided by an embodiment of the present application is shown, Figure 4 A structural schematic diagram of the battery cell 20 provided by an embodiment of the present application is shown, Figure 3 And Figure 4 As shown in FIGS. 1 and 2, the battery cell 20 provided by the embodiments of the present application can include a shell 21 having a closed accommodation space and an electrode assembly 22 placed in the accommodation space in the shell 21. The shell 21 can include a shell body 211 which is a hollow structure having at least one opening and an end cover 212 which is used to be buckled with the shell body 211 to form the shell 21 having a closed accommodation space.

[0122] 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.

[0123] The electrode assembly 22 in the embodiments of the present application includes a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 20, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through.

[0124] 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 as the shell 211, i.e., both the shell 211 and the end cover 212 are hollow structures with one opening, and the two openings are connected to form the outer shell 21 with a closed accommodation space.

[0125] 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.

[0126] The outer shell 21 can have various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, as shown in Figure 3 and Figure 4 in the embodiments of the present application, the outer shell 21 is mainly described as a cuboid structure.

[0127] It should be understood that the end cover 212 of the embodiments of the present application is used to cooperate with the shell 211 to isolate the internal environment of the battery monomer 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 3 and Figure 4 the shell 211 is a cuboid structure, and the end cover 212 is a rectangular plate-shaped structure adapted to the shell 211.

[0128] In some embodiments, the shell 211 can be a hollow structure with at least one opening at one end, and the shape of the end cover 212 can be adapted to the shape of the shell 211, and the end cover 212 is used to cover the opening of the shell 211 to isolate the internal environment of the battery monomer 20 from the external environment. If the shell 211 is a hollow structure with an opening at one end, the end cover 212 can be provided as one.

[0129] 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 can be the same as or different from the material of the shell 211; the materials of different walls of the shell 211 can also be the same or different.

[0130] The end cover 212 of the embodiments of the present application can be any wall of the shell 21. For example, the end cover 212 can be the largest wall or the smallest wall among the walls included in the shell 21, or can be other walls, and the embodiments of the present application are not limited thereto. Alternatively, the end cover 212 can be other structures. For example, the end cover 212 can be a groove structure with an opening to cover the opening of the shell 211, and the embodiments of the present application are not limited thereto.

[0131] It should be understood that the battery cell 20 further includes electrode terminals 214. The electrode terminals 214 of the embodiments of the present application are used to electrically connect with the electrode assembly 22 inside the battery cell 20 to output the electric energy of the battery cell 20. As shown in Figure 3 to Figure 4 the battery cell 20 can include at least two electrode terminals 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 electrically connect with the positive tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used to electrically connect with the negative tab 222b of the electrode assembly 22. The positive electrode terminal 214a can be directly connected with the positive tab 222a or indirectly connected, and the negative electrode terminal 214b can be directly connected with the negative tab 222b or indirectly connected. 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.

[0132] 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 cell 20. For example, Figure 3 and Figure 4 for the cuboid battery cell 20 shown in FIGS. 1 to 3, the walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the combined one or more electrode assemblies 22. For example, the shell 211 can be a hollow cuboid or a hollow square or a hollow cylinder, and one of the faces of the shell 211 has an opening so that the one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a hollow square, one of the planes of the shell 211 is an opening plane, i.e., the plane does not have a wall so that the inside and outside of the shell 211 are in communication. When the shell 211 can be a hollow cylinder, the end face of the shell 211 is an opening plane, i.e., the end face does not have a wall so that the inside and outside of the shell 211 are in communication. The end cover 212 covers the opening and is connected with the shell 211 to form a closed cavity in which the electrode assembly 22 is placed. The shell 211 is filled with an electrolyte, such as an electrolyte solution.

[0133] In the battery cell 20, the electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. According to actual use requirements, the electrode assembly 22 in the housing 211 can be one or multiple. For example, as shown in Figure 4 two electrode assemblies 22 are arranged in the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylinder structure, the housing 211 can also be a cylinder structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0134] In the battery cell 20, the electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. According to actual use requirements, the electrode assembly 22 in the housing 211 can be one or multiple. For example, as shown in Figure 4 two electrode assemblies 22 are arranged in the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylinder structure, the housing 211 can also be a cylinder structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In the embodiment of the present application, the material of the housing 211 can include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0135] The battery cell 20 can also be provided with a pressure relief mechanism 213. 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.

[0136] 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 break when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0137] In some implementations, the battery cell 20 can also be provided with an insulating piece arranged in the accommodation space of the housing 211, and the insulating piece 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.

[0138] Figure 5 A cross-sectional schematic view of a partial structure of the battery cell 20 provided by an embodiment of the present application is shown.

[0139] In some implementations, as shown in Figure 5As shown, the battery cell 20 comprises a housing 21 and an electrode assembly 22, the housing 21 comprises a receiving cavity 50 and a first wall 215, the electrode assembly 22 is received in the receiving cavity 50, a first surface 70 of the first wall 215 away from the receiving cavity 50 is provided with an insulation structure 60, the insulation structure 60 comprises a first insulation layer 610 and a first insulation structure 620, the first insulation structure 620 is provided on a surface of the first insulation layer 610 away from the receiving cavity 50, the first insulation structure 620 comprises a metal shielding layer 621 and a second insulation layer 622, the second insulation layer 622 is provided on a surface of the metal shielding layer 621 away from the first insulation layer 610.

[0140] It should be understood that the battery cell 20 of the embodiments of the present application can be a polyhedral structure of any shape, i.e., the battery cell 20 can comprise a plurality of walls, the first wall 215 is any one wall of the battery cell 20, and the first wall 215 may, for example, comprise but is not limited to the following examples: the first wall 215 can be the wall with the smallest area of the battery cell 20; the first wall 215 can also be the wall with the largest area of the battery cell 20; the first wall 215 can be the wall provided with the electrode terminal 214 of the battery cell 20; the first wall 215 can be the wall adjacent to the wall provided with the electrode terminal 214 of the battery cell 20; the first wall 215 can be the wall opposite to the wall provided with the electrode terminal 214 of the battery cell 20.

[0141] It should also be understood that the insulation structure 60 in the embodiments of the present application comprises a first insulation layer 610 and a first insulation structure 620, and the first insulation structure 620 is provided on a surface of the first insulation layer 610 away from the receiving cavity 50, i.e., the first insulation layer 610 is formed on the first surface 70. Specifically, the first insulation layer 610 on the first surface 70 can be formed by one of the following processes: spraying, dipping or electrophoretic plating.

[0142] For example, the spraying process can include an electrostatic spraying process or a plasma spraying process, the electrostatic spraying process utilizes an electrostatic field to uniformly adsorb insulation powder on the first surface 70, and is cured by heating to form an insulation layer, the plasma spraying process is to melt ceramic material by high-temperature plasma and spray it to the first surface 70 to form a dense insulation layer. The dipping process refers to immersing the housing 21 of the battery cell 20 in an insulation paint or resin solution, and then taking it out for curing treatment to form an insulation layer on the first surface 70. The electrophoretic plating process is to drive charged coating particles to migrate and deposit on the first surface 70 by an electric field, which can achieve uniform coverage on recesses, gaps or special-shaped structures.

[0143] It should also be understood that the first insulation structure 620 includes a metal shielding layer 621 and a second insulation layer 622 disposed on a surface of the metal shielding layer 621 away from the first insulation layer 610. Accordingly, the second insulation layer 622 can also be formed on the surface of the metal shielding layer 621 away from the first insulation layer 610 by a spraying, dipping or electrophoretic plating process.

[0144] It should also be understood that due to the limitations of the process for forming the first insulation layer 610 itself, there is a certain threshold value for the thickness of the first insulation layer 610, i.e. the dimension of the first insulation layer 610 in the thickness direction of the first wall 215. As the voltage level applied to the battery device 10 continues to increase, the thickness of the existing first insulation layer 610 cannot meet the current insulation performance requirements. Therefore, by providing the metal shielding layer 621 in the embodiments of the present application, for example, the metal shielding layer 621 can be provided on the surface of the first insulation layer 610 away from the accommodation cavity, and a second insulation layer 622 with a certain thickness can be formed on the surface of the metal shielding layer 621 away from the first insulation layer 610. Thus, the thickness of the insulation structure 60 on the first surface 70 is increased to meet the current insulation performance requirements.

[0145] It should also be understood that the thickness of the metal shielding layer 621 can be set according to actual needs, which is not limited in the embodiments of the present application. In a plane perpendicular to the thickness direction of the first wall 215, the orthographic projection of the metal shielding layer 621 can cover the orthographic projection of the first insulation layer 610. It should also be understood that the metal shielding layer 621 can be formed on the surface of the first insulation layer 610 away from the first wall 215 by a spraying process or a dipping process.

[0146] It should also be understood that the material of the first insulation layer 610 in the embodiments of the present application can be the same as or different from the material of the second insulation layer 622. Accordingly, the thickness of the first insulation layer 610 can be the same as or different from the thickness of the second insulation layer 622, and the forming process of the first insulation layer 610 can be the same as or different from the forming process of the second insulation layer 622. Specifically, the material, thickness and forming process of the first insulation layer 610 and the second insulation layer 622 can be set according to actual needs.

[0147] In the embodiment of the present application, by arranging the insulating structure 60 on the first surface 70 of the first wall 215 away from the accommodating cavity 50, the insulating structure 60 includes the first insulating layer 610 and the first insulating structure 620 arranged on the surface of the first insulating layer 610 away from the accommodating cavity 50, the first insulating structure 620 includes the metal shielding layer 621 and the second insulating layer 622 arranged on the surface of the metal shielding layer 621 away from the first insulating layer 610, compared with the prior art technical solution of arranging only the first insulating layer 610 on the first surface 70, the insulating performance of the battery monomer 20 can be improved to meet the use requirements in the high-voltage use scenario, thereby improving the use performance of the battery monomer 20.

[0148] Figure 6 A cross-sectional schematic view of a partial structure of the battery monomer 20 provided by another embodiment of the present application is shown.

[0149] In some implementations, the number of the first insulating structures 620 is N, the Nth metal shielding layer 621 in the Nth first insulating structure 620 is formed on the surface of the N-1th second insulating layer 622 in the N-1th first insulating structure 620 away from the first wall 215, and N is an integer greater than or equal to 2.

[0150] It should be understood that each first insulating structure 620 in the embodiment of the present application can include one metal shielding layer 621 and one second insulating layer 622 formed on the surface of the metal shielding layer 621 away from the accommodating cavity 50.

[0151] Exemplarily, as shown in Figure 6 The number of the first insulating structures 620 can be set to 2, i.e., the 1st first insulating structure 620 and the 2nd first insulating structure 620, the 1st first insulating structure 620 includes the 1st metal shielding layer 621 and the 1st second insulating layer 622, and the 2nd first insulating structure 620 includes the 2nd metal shielding layer 621 and the 2nd second insulating layer 622. Specifically, the 1st metal shielding layer 621 is formed on the first surface 70, the 1st second insulating layer 622 is formed on the surface of the 1st metal shielding layer 621 away from the first wall 215, the 2nd metal shielding layer 621 is formed on the surface of the 1st second insulating layer 622 away from the 1st metal shielding layer 621, and the 2nd second insulating layer 622 is formed on the surface of the 2nd metal shielding layer 621 away from the 1st second insulating layer 622.

[0152] It should also be understood that the number of the first insulation structures 620 in the embodiments of the present application can be set according to actual needs. For example, the number of the first insulation structures 620 can be set to 2 or 3. Specifically, the number of the first insulation structures 620 can be set according to the insulation performance requirements in actual application scenarios.

[0153] In the embodiments of the present application, by setting the number of the first insulation structures 620 to N, and the Nth metal shielding layer 621 in the Nth first insulation structure 620 is formed on the surface of the N-1th second insulation layer 622 in the N-1th first insulation structure 620 away from the first wall 215, i.e., the first surface 70 can be provided with a plurality of first insulation structures 620, so as to effectively meet the use requirements in different high-voltage use scenarios, thereby improving the use performance of the battery monomer 20.

[0154] In some implementations, the minimum dimension D1 of the insulation structure 60 along the thickness direction of the first wall 215 satisfies: 150 μm≤D1≤200 μm.

[0155] For example, the minimum dimension D1 of the insulation structure 60 along the thickness direction of the first wall 215 can be set to: 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm, 200 μm, etc., or a value within the range obtained by any two of the above combinations.

[0156] It should be understood that, considering the insulation performance of the battery monomer 20 and the space occupied by the battery monomer 20 in the battery device 10, i.e., the volume energy density of the battery monomer 20, by setting the minimum dimension D1 of the insulation structure 60 along the thickness direction of the first wall 215 to satisfy 150 μm≤D1≤200 μm, the insulation performance and energy density of the battery monomer 20 are taken into account, and at the same time, the processing and manufacturing costs of the battery monomer 20 can be reasonably controlled.

[0157] In the embodiments of the present application, by setting the minimum dimension D1 of the insulation structure 60 along the thickness direction of the first wall 215 to satisfy: 150 μm≤D1≤200 μm, the energy density and insulation performance of the battery monomer 20 are taken into account, thereby improving the use performance of the battery monomer 20.

[0158] In some implementations, in a plane perpendicular to the thickness direction of the first wall 215, the orthographic projection of the first insulation structure 620 covers the orthographic projection of the first insulation layer 610.

[0159] It should be understood that, in a plane perpendicular to the thickness direction of the first wall 215, the first insulating structure 620 can cover the first insulating layer 610 in a front projection manner, which means that the area of the front projection of the first insulating structure 620 is greater than or equal to the area of the front projection of the first insulating layer 610, so that the front projection of the first insulating structure 620 can completely cover the front projection of the first insulating layer 610.

[0160] In the embodiment of the present application, in a plane perpendicular to the thickness direction of the first wall 215, the first insulating structure 620 is arranged to cover the first insulating layer 610 in a front projection manner, so as to further improve the insulation performance of the battery monomer 20, so as to meet the use requirements in different high-voltage use scenarios, thereby improving the use performance of the battery monomer 20.

[0161] In some implementations, the material of the metal shielding layer 621 is one of aluminum, copper, nickel, and silver.

[0162] It should be understood that the material of the metal shielding layer 621 can be one of aluminum, copper, nickel, and silver, and the metal shielding layer 621 can be formed by a spraying process or an immersion process. For example, the metal shielding layer 621 can be formed on the surface of the first insulating layer 610 away from the first wall 215 by a spraying process, so that the second insulating layer 622 can be formed on the surface of the metal shielding layer 621 away from the first insulating layer 610.

[0163] In the embodiment of the present application, the material of the metal shielding layer 621 is one of aluminum, copper, nickel, and silver, so that the second insulating layer 622 can be smoothly formed on the surface of the metal shielding layer 621 away from the first insulating layer 610, thereby improving the insulation performance of the battery monomer 20.

[0164] Figure 7 A cross-sectional schematic view of a partial structure of a battery monomer 20 provided by another embodiment of the present application is shown.

[0165] In some implementations, as shown in Figure 7 The battery monomer 20 further includes a filling structure 80 for filling the recessed area 90 of the first surface 70.

[0166] It should be understood that the recessed area 90 of the first surface 70 in the embodiment of the present application refers to a recessed structure or a groove structure formed on the first surface 70 of the battery monomer 20 during processing, manufacturing, and transportation. The filling structure 80 is filled in the recessed area 90 on the first surface 70, so that the first insulating layer 610 can be smoothly formed on the first surface 70.

[0167] It should also be understood that the filling material can be a flexible material to facilitate filling of the recessed area on the first surface 70, and the surface formed after filling is flush with the surface of other areas on the first surface 70 except the recessed area.

[0168] In the embodiment of the present application, by setting the battery monomer 20 to further include a filling structure for filling the recessed area of the first surface 70, the influence of the recessed area of the first surface 70 on the insulation performance of the battery monomer 20 is reduced, and at the same time, the first insulation layer 610 can be smoothly formed on the first surface 70, thereby improving the insulation performance of the battery monomer 20.

[0169] In some implementations, the material of the filling structure 80 is silicone grease or a semiconductor material.

[0170] It should be understood that the material of the filling structure 80 in the embodiment of the present application can be set to silicone grease or a semiconductor material to facilitate filling of the recessed area on the first surface 70, so that the first insulation layer 610 can be smoothly formed on the first surface 70, thereby improving the insulation performance of the battery monomer 20.

[0171] In the embodiment of the present application, by setting the material of the filling structure 80 to be silicone grease or a semiconductor material, the insulation performance and manufacturing cost of the battery monomer 20 are taken into account, thereby improving the use performance of the battery monomer 20.

[0172] In some implementations, the material of the first insulation layer 610 and / or the second insulation layer 622 is one of polyimide, polytetrafluoroethylene, polyethylene terephthalate, and epoxy resin.

[0173] It should be understood that when the material of the first insulation layer 610 and / or the second insulation layer 622 is one of polyimide, polytetrafluoroethylene, polyethylene terephthalate, and epoxy resin, the first insulation layer 610 can be formed on the first surface 70 by a spraying, dipping, or electrophoretic plating process, and the second insulation layer 622 can be formed on the surface of the metal shielding layer 621 away from the first insulation layer 610 by a spraying, dipping, or electrophoretic plating process.

[0174] In the embodiment of the present application, by setting the material of the first insulation layer 610 and / or the second insulation layer 622 to be polyimide, polytetrafluoroethylene, polyethylene terephthalate, and epoxy resin, the insulation performance and manufacturing cost of the battery monomer 20 are taken into account, thereby improving the use performance of the battery monomer 20.

[0175] In some embodiments, the first insulating layer 610 is formed on the first surface 70 by an electrophoretic plating process, and the second insulating layer 622 is formed on a surface of the metal shielding layer 621 away from the first insulating layer 610 by an electrophoretic plating process.

[0176] In the embodiments of the present application, the first insulating layer 610 is formed on the first surface 70 by an electrophoretic plating process, and the second insulating layer 622 is formed on a surface of the metal shielding layer 621 away from the first insulating layer 610 by an electrophoretic plating process, so as to improve the uniformity and stability of the first insulating layer 610 and the second insulating layer 622, and reduce the processing and manufacturing costs of the battery monomer 20, thereby improving the insulation performance and use performance of the battery monomer 20.

[0177] In some embodiments, the first wall 215 is a bottom wall of the battery monomer 20 along the height direction of the battery monomer 20.

[0178] It should be understood that, in the case of the battery monomer 20 being applied to an energy storage device, since the voltage level accessed by the energy storage device is high, the insulation performance requirement of the bottom wall of the battery monomer 20 along the gravity direction is high. By setting the first wall 215 as the bottom wall of the battery monomer 20 along the height direction of the battery monomer 20, the risk of short circuit caused by the direct contact of the bottom wall of the battery monomer 20 with other components can be reduced, so as to improve the insulation performance of the area where the bottom wall of the battery monomer 20 is located.

[0179] In the embodiments of the present application, by setting the first wall 215 as the bottom wall of the battery monomer 20 along the height direction of the battery monomer 20, the risk of short circuit caused by the direct contact of the bottom wall of the battery monomer 20 with other components can be reduced, so as to improve the insulation performance of the area where the bottom wall of the battery monomer 20 is located, thereby improving the use performance of the battery monomer 20.

[0180] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10, comprising a plurality of battery monomers 20, the battery monomer 20 being the battery monomer 20 in any of the above-mentioned embodiments.

[0181] According to some embodiments of the present application, the embodiments of the present application further provide a power utilization device, comprising the battery device 10 in any of the above-mentioned embodiments, the battery device 10 being used to provide electric energy for the power utilization device. Specifically, the power utilization device can be the vehicle 1 shown in the above-mentioned embodiments, or any power utilization device using the battery device 10. Figure 1 The power utilization device can be the vehicle 1 shown in the above-mentioned embodiments, or any power utilization device using the battery device 10.

[0182] The power utilization device can be the vehicle 1 shown in the above-mentioned embodiments, or any power utilization device using the battery device 10.

[0183] According to some embodiments of the present application, the present application further provides a storage device, comprising the battery device 10 in any of the above embodiments, wherein the battery device 10 is used to store electric energy for the storage device.

[0184] According to some embodiments of the present application, referring to Figure 5 to Figure 7 , the present application provides a battery monomer 20, comprising: a shell 21 and an electrode assembly 22, the shell 21 comprises a containing cavity 50 and a first wall 215, the electrode assembly 22 is contained in the containing cavity 50, a first surface 70 of the first wall 215 away from the containing cavity 50 is provided with an insulation structure 60, the insulation structure 60 comprises a first insulation layer 610 and a first insulation structure 620, the first insulation structure 620 is arranged on the surface of the first insulation layer 610 away from the containing cavity 50, the first insulation structure 620 comprises a metal shielding layer 621 and a second insulation layer 622, the second insulation layer 622 is arranged on the surface of the metal shielding layer 621 away from the first insulation layer 610. The number of the first insulation structure 620 is N, the Nth metal shielding layer 621 in the Nth first insulation structure 620 is formed on the surface of the N-1th second insulation layer 622 in the N-1th first insulation structure 620 away from the first wall 215, N is an integer greater than or equal to 2. The minimum size D1 of the insulation structure 60 along the thickness direction of the first wall 215 satisfies: 150 μm≤D1≤200 μm.

[0185] 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 that: 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 cell, characterized by, The battery monomer comprises: a housing (21) comprising a containing cavity (50) and a first wall (215); an electrode assembly (22) contained in the containing cavity (50); a first surface (70) of the first wall (215) away from the containing cavity (50) is provided with an insulation structure (60); the insulation structure (60) comprises a first insulation layer (610) and a first insulation structure (620), the first insulation structure (620) is arranged on the surface of the first insulation layer (610) away from the containing cavity (50), and the first insulation structure (620) comprises a metal shielding layer (621) and a second insulation layer (622), the second insulation layer (622) is arranged on the surface of the metal shielding layer (621) away from the first insulation layer (610).

2. The battery cell of claim 1, wherein, The number of the first insulation structure (620) is N, the Nth metal shielding layer (621) in the Nth first insulation structure (620) is formed on the surface of the N-1th second insulation layer (622) in the N-1th first insulation structure (620) away from the first wall (215), and N is an integer greater than or equal to 2.

3. The battery cell of claim 1, wherein, The minimum size D1 of the insulation structure (60) along the thickness direction of the first wall (215) satisfies: 150 μm≤D1≤200 μm.

4. The battery cell of claim 1, wherein, In the plane perpendicular to the thickness direction of the first wall (215), the orthographic projection of the first insulation structure (620) covers the orthographic projection of the first insulation layer (610).

5. The battery cell of claim 1, wherein, The material of the metal shielding layer (621) is one of the following: aluminum, copper, nickel, and silver.

6. The battery cell of claim 1, wherein, The battery monomer further comprises a filling structure (80) for filling a recessed area (90) of the first surface (70).

7. The battery cell of claim 6, wherein, The material of the filling structure (80) is silicone grease or a semiconductor material.

8. The battery cell of claim 1, wherein, The material of the first insulation layer (610) and / or the second insulation layer (622) is one of the following: polyimide, polytetrafluoroethylene, polyethylene terephthalate, and epoxy resin.

9. The battery cell of claim 1, wherein, The first insulation layer (610) is formed on the first surface (70) by an electrophoretic plating process, and the second insulation layer (622) is formed on the surface of the metal shielding layer (621) away from the first insulation layer (610) by an electrophoretic plating process.

10. The battery cell of any one of claims 1 to 9, wherein, The first wall (215) is a bottom wall of the battery monomer along the height direction of the battery monomer.

11. A battery device characterized by comprising: The battery monomer comprises: a plurality of battery monomers, the battery monomers being the battery monomer according to any one of claims 1 to 10.

12. An electrical device, comprising: The battery device comprises: the battery device according to claim 11, the battery device being used to provide electric energy for the electric device.

13. An energy storage device, characterized by The battery device comprises: the battery device according to claim 11, the battery device being used to store electric energy for the energy storage device.

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