Adapter sheet, battery cell, battery device and energy storage device

Abstract

The embodiment of the invention discloses an adapter piece, a battery cell, a battery device and an energy storage device. The battery cell includes: a housing having an accommodation space, the housing including a first wall; the electrode assembly is accommodated in the accommodating space of the shell, and the electrode assembly comprises a tab; the electrode terminal is arranged on the shell; the switching piece is electrically connected with the pole lug and is electrically connected with the electrode terminal; wherein an insulating layer is arranged on the first side face of the switching piece, the first side face is the face, closest to the first wall, of the switching piece, and the first wall is the wall, with the largest area, of the shell. According to the adapter sheet, the battery cell, the battery device and the energy storage device, the high voltage resistance of the battery cell can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a switching chip, a battery cell, a battery device and an energy storage device. Background Art

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

[0003] During the battery charging and discharging process, when a problem occurs in the system, the battery cell will break through the shell with high voltage from the inside, causing electrolyte and gas leakage, affecting the safety performance of the battery. Summary of the invention

[0004] The embodiments of the present application provide a switching plate, a battery cell, a battery device and an energy storage device, which can improve the high-voltage resistance of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell having a storage space, the shell comprising a first wall; an electrode assembly, the electrode assembly being accommodated in the storage space of the shell, the electrode assembly comprising a pole ear; an electrode terminal, the electrode terminal being arranged on the shell; a adapter plate, the adapter plate being electrically connected to the pole ear and to the electrode terminal; wherein an insulating layer is provided on a first side surface of the adapter plate, the first side surface is the surface of the adapter plate closest to the first wall, and the first wall is the wall with the largest area of ​​the shell.

[0006] In the technical solution of the embodiment of the present application, since the outer shell of the battery cell is conductive and even charged, some areas of the adapter are close to the outer shell of the battery cell, especially the distance between the adapter and the larger surface of the outer shell is very small, and there is no insulating protective layer between the two, so the local discharge phenomenon is serious here. Therefore, by setting an insulating layer here, the mutual discharge between the adapter and the outer shell can be blocked to a certain extent, thereby improving the high-voltage resistance of the battery cell and reducing the risk of the outer shell being broken down by high voltage and causing the insulation failure of the battery cell.

[0007] In some embodiments of the first aspect, the adapter plate includes a pole tab connection surface electrically connected to the pole tab, and an electrode terminal connection surface electrically connected to the electrode terminal, the first side surface is perpendicular to the pole tab connection surface, and / or the first side surface is perpendicular to the electrode terminal connection surface.

[0008] In the embodiment of the present application, there is often partial discharge on the side of the adapter, which causes the shell very close to it to be electrically punctured, causing the conductive liquid or gas inside the battery cell to leak out of the battery cell. Therefore, by providing an insulating layer on the side of the adapter perpendicular to the electrode terminal connection surface and the tab connection surface, the high voltage resistance of the battery cell can be improved, and the safety performance of the battery cell can be improved.

[0009] In some embodiments of the first aspect, all sides of the adapter are provided with an insulating layer, including the first side.

[0010] In the embodiment of the present application, by providing an insulating layer on all sides of the adapter, the risk of the outer shell being punctured due to local discharge between any side of the adapter and the outer shell can be further reduced, thereby improving the high voltage resistance of the battery cell.

[0011] In some embodiments of the first aspect, the insulating layer extends toward the tab connection surface and the electrode terminal connection surface of the adapter, covering edge portions of the tab connection surface and the electrode terminal connection surface.

[0012] In the embodiment of the present application, by extending the insulating layer to other connecting surfaces, the side of the adapter is completely covered, which can reduce the probability of local discharge in the transition area from the side to the connecting surface, further improve the insulation performance between the adapter and the outer shell, and enhance the high voltage resistance of the battery cell.

[0013] In some embodiments of the first aspect, a tab welding area is provided on the tab connecting surface, an electrode terminal welding area is provided on the electrode terminal connecting surface, and the insulating layer covers all areas of the adapter except the tab welding area and the electrode terminal welding area.

[0014] In the embodiment of the present application, by covering all areas of the adapter plate except the area that needs to be welded with an insulating layer, the electrical conduction between the adapter plate and other charged structures in the battery cell, such as the shell, cover plate and other structures in the battery cell that may be charged, can be blocked. Since there is an insulating layer between the adapter plate and other charged structures, the phenomenon of local discharge between the two is reduced, and the high voltage resistance of the battery cell is improved.

[0015] In some embodiments of the first aspect, the breakdown strength of the insulating layer is The thickness of the insulation layer Satisfies the relationship:

[0016] in, is the relative dielectric constant, and is a constant.

[0017] In the embodiment of the present application, by setting a certain thickness for the insulating layer, when a reverse high voltage is applied to the battery cell, the breakdown voltage between the adapter and the shell can be increased, the risk of breakdown of the battery cell can be reduced, and the safety performance of the battery cell can be improved.

[0018] In some embodiments of the first aspect, the thickness t of the insulating layer ranges from [2 μm, 2 mm].

[0019] In the embodiment of the present application, the thickness t of the insulating layer is set to be greater than or equal to 2μm, and the insulating layer can still maintain effective insulation performance under a reverse high voltage of 200V, thereby reducing the risk of the adapter 24 breaking through the outer shell 21; and the thickness t of the insulating layer is set to be less than or equal to 2mm, which can reduce the overall volume of the adapter 24, thereby reducing the internal space occupied by the adapter 24 in the battery cell 20, and improving the energy density of the battery cell.

[0020] In some embodiments of the first aspect, the thickness t of the insulating layer ranges from [2 μm, 0.2 mm].

[0021] In the embodiment of the present application, the thickness t of the insulating layer is set to be greater than or equal to 2μm, and the insulating layer can still maintain effective insulation performance under a reverse high voltage of 200V, thereby reducing the risk of the adapter 24 piercing the outer shell 21; and the thickness t of the insulating layer is set to be less than or equal to 0.2mm, which can further reduce the internal space occupied by the adapter 24 in the battery cell 20 and improve the energy density of the battery cell.

[0022] In some embodiments of the first aspect, the breakdown voltage of the insulating layer is greater than 200V, and the thickness t is greater than 2μm; or, the breakdown voltage of the insulating layer is greater than 500V, and the thickness t is greater than 5μm; or, the breakdown voltage of the insulating layer is greater than 700V, and the thickness t is greater than 8μm.

[0023] In the embodiment of the present application, by setting the corresponding value range of the insulation layer thickness under different conditions, the appropriate insulation layer thickness can be selected according to the actual system structure. When the battery cell is applied with reverse high voltage, the breakdown voltage between the adapter and the shell can be increased, thereby improving the safety performance of the battery cell.

[0024] In some embodiments of the first aspect, the material of the insulating layer includes one or more of glass fiber, mica, ceramic, silicone, polytetrafluoroethylene, polyester, polyimide, rubber, polyethylene, epoxy resin, silicone rubber, and polyvinyl chloride.

[0025] In some embodiments of the first aspect, the insulating layer is covered on the adapter sheet by spraying, bonding, mechanical riveting, in-situ growth or hot melting.

[0026] In a second aspect, a transfer sheet is provided, comprising: a pole tab connection surface, the pole tab connection surface being electrically connected to the pole tab; an electrode terminal connection surface, the electrode terminal connection surface being electrically connected to the electrode terminal; a first side surface, the first side surface being provided with an insulating layer, the first side surface being perpendicular to the pole tab connection surface, and / or the first side surface being perpendicular to the electrode terminal connection surface.

[0027] In a third aspect, a battery device is provided, which is the battery cell described in the first aspect or any one embodiment of the first aspect.

[0028] In a fourth aspect, an energy storage device is provided, comprising a battery cluster, wherein the battery cluster comprises the battery cells of the first aspect or any one embodiment of the first aspect, and the battery cluster can increase the voltage and capacity of the energy storage device.

[0029] In a fifth aspect, an electrical device is provided, comprising: a battery device, the battery device comprising a battery cell according to the first aspect or any one embodiment of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0030] In some embodiments of the fifth aspect, the electrical equipment is a vehicle, a ship, or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a vehicle according to an embodiment of the present application; Figure 2 A schematic diagram of the structure of a battery device according to an embodiment of the present application; Figure 3 A schematic diagram of the structure of a battery cell according to an embodiment of the present application; Figure 4 A schematic diagram of the structure of the adapter sheet according to an embodiment of the present application; Figure 5 Another structural schematic diagram of the adapter sheet of the embodiment of the present application; Figure 6 This is another structural schematic diagram of the adapter sheet of the embodiment of the present application; Figure 7 This is another structural schematic diagram of the adapter sheet of the embodiment of the present application; Figure 8 A schematic diagram of the side structure of the adapter sheet of an embodiment of the present application; Fig. 9 This is another structural schematic diagram of the adapter sheet of the embodiment of the present application; Fig.10 This is another structural schematic diagram of the adapter sheet according to the embodiment of the present application.

[0032] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0041] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0042] The battery cell 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0043] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0044] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0045] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0046] As an example, the positive electrode current collector may be 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, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0047] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co At least one of 0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2) and modified compounds thereof. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0048] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon. When the foamed metal is used as the positive electrode, the positive electrode active material may not be disposed on the surface of the foamed metal, but of course, the positive electrode active material may also be disposed. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

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

[0050] As an example, the negative electrode current collector may be 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, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

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

[0052] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0053] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0054] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

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

[0056] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may 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. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0059] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it 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 also be coated on the surface of the separator.

[0060] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0061] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0062] In some embodiments, the electrolyte may further include additives, for example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of battery cells, such as additives that improve overcharge / fast charge performance of battery cells, additives that improve high temperature performance of battery cells, additives that improve low temperature performance of battery cells, etc.

[0063] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0064] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0065] In some embodiments, the electrode assembly is a laminate structure.

[0066] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and multiple positive electrode sheets and multiple negative electrode sheets are alternately stacked. As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folded sections, and a positive electrode sheet is sandwiched between adjacent folded sections.

[0067] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0068] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0069] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0070] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0071] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0072] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0073] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0074] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0075] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0076] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0077] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0078] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0079] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0080] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0081] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0082] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0083] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0084] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0085] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0086] The embodiment of the present application provides an energy storage device, including one or more battery clusters (Battery Cluster) to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0087] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. 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 low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0088] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0089] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, wherein the battery clusters are housed in the cabinet.

[0090] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0091] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery device through a pipeline.

[0092] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the 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 main control module includes a slave battery management unit SBMU (SBMU), a fusion switch and other modules.

[0093] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0094] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., which are used to detect, alarm or extinguish fire in the energy storage system. As an example, the power distribution device may be used to distribute power to the power modules of the energy storage device.

[0095] The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, the reliability and safety of battery use must also be considered. There are some conductive structures inside the battery cells with local high voltage, especially in the structure of multiple battery cells connected in series. When the adapter of one of the battery cells is broken, the voltage of multiple battery cells in series will be applied to the battery cell, causing the battery cell to be subjected to reverse high voltage for a short time, resulting in partial discharge. Once the local continuous discharge breaks down the battery cell shell, the electrolyte or gas inside the battery cell leaks to the outside, which has a serious impact on the safety performance of the battery device.

[0096] The embodiment of the present application provides a switching plate, a battery cell, a battery device and an energy storage device, wherein the battery cell includes a shell, an electrode assembly, an electrode terminal and a switching plate, wherein the shell has a storage space, and the shell includes a first wall; the electrode assembly is accommodated in the storage space of the shell, and the electrode assembly includes a tab; the electrode terminal is arranged on the shell; the switching plate is electrically connected to the tab and to the electrode terminal; wherein an insulating layer is arranged on the first side of the switching plate, the first side is the surface of the switching plate closest to the first wall, and the first wall is the wall with the largest area of ​​the shell. By arranging an insulating layer on the side of the switching plate in the battery cell, the battery device and the energy storage device, the risk of the switching plate voltage breaking through the shell can be reduced, the phenomenon of non-directional leakage of electrolyte and gas can be reduced, and the high voltage resistance and safety performance of the battery cell can be improved.

[0097] The technical solution described in the embodiments of the present application can be applied to various electrical equipment using battery devices.

[0098] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0099] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0100] For example, Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 may be provided inside the vehicle 1. The controller 30 is used to control the battery device 10 to supply power to the motor 40. For example, a battery device 10 may be provided at the bottom, front or rear of the vehicle 1. The battery device 10 may be used to supply power to the vehicle 1. For example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0101] For example. Figure 2 FIG. 1 is a schematic diagram showing a partial structure of a battery device 10 according to an embodiment of the present application. Figure 2 As shown, the battery device 10 of the embodiment of the present application may include a plurality of battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiment of the present application may be set according to the actual application. For example, the battery cell 20 may be as follows: Figure 2 The cylindrical shape shown, or it can also be different from Figure 2 The rectangular parallelepiped or other shapes shown are not limited to the embodiments of the present application.

[0102] It should be understood that Figure 2 As shown, the battery device 10 of the embodiment of the present application may further include a box body 11, which may be used to accommodate a plurality of battery cells 20. The interior of the box body 11 of the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. The box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are snapped together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the components accommodated inside. For example, they may be determined according to the shape of the combination of the plurality of battery cells 20 accommodated inside. At least one of the first box body part 111 and the second box body part 112 may have an opening. For example, as Figure 2As shown, the first box body 111 and the second box body 112 can both be hollow cuboids and each have an open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 11 with a closed chamber, and the chamber can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in mixed combination and placed in the box body 11 formed by the first box body 111 and the second box body 112 buckled together.

[0103] For example, unlike Figure 2 As shown, only one of the first box body 111 and the second box body 112 may be a hollow cuboid with an opening, while the other is in a plate shape to cover the opening. Taking the second box body 112 as a hollow cuboid with an opening and the first box body 111 as a plate, the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0104] Figure 3 The structure diagram of the battery cell 20 of the embodiment of the present application is shown as follows: Figure 3 As shown, the battery cell 20 of the embodiment of the present application may include: a housing 21, an electrode assembly 22, an electrode terminal 23 and a transfer plate 24. The housing 21 has a receiving space 2111, and the housing 21 includes a first wall 201; the electrode assembly 22 is received in the receiving space 2111 of the housing 21, and the electrode assembly 22 includes a tab 221; the electrode terminal 23 is disposed on the housing 21; the transfer plate 24 is electrically connected to the tab 221, and is also electrically connected to the electrode terminal 23; wherein, the first side surface 241 of the transfer plate 24 is provided with an insulating layer, the first side surface 241 is the surface of the transfer plate 24 closest to the first wall 201, and the first wall 201 is the wall with the largest area of ​​the housing 21.

[0105] It should be understood that the shape of the battery cell 20 of the embodiment of the present application can be flexibly set according to the actual application, that is, the shell 21 of the battery cell 20 can be any polyhedral structure, for example, it can be set to a rectangular parallelepiped or a cylinder. For example, the shape of the outside of the battery cell 20 can be the same as or different from the shape of the electrode assembly 22 inside it. For example, if the electrode assembly 22 is a cylindrical structure, the shell 21 of the battery cell 20 can also be a cylindrical structure, or it can also be a rectangular parallelepiped structure; if the electrode assembly 22 is a rectangular parallelepiped structure, the shell 21 can also generally be a rectangular parallelepiped structure, but the embodiment of the present application is not limited thereto.

[0106] In the embodiment of the present application, the battery cell 20 includes a shell 211, for example, the housing 21 may include the shell 211. Specifically, the shell 211 is a hollow structure with an opening, and the electrode assembly 22 is accommodated in the shell 211; the battery cell 20 may also include a cover plate 212, which is used to cover the opening of the shell 211 to isolate the external environment.

[0107] The battery cell 20 of the embodiment of the present application may include one or more electrode terminals 23 , and the one or more electrode terminals 23 may be disposed on the same wall of the housing 21 , or may also be disposed on different walls. Figure 3 For example, the battery cell 20 includes two electrode terminals 23, and the two electrode terminals 23 are disposed on the flat plate-shaped cap plate 212. The two electrode terminals 23 may include a positive electrode terminal 23a and a negative electrode terminal 23b.

[0108] like Figure 3 As shown, the electrode assembly 22 may include a plurality of tabs 221, for example, the tabs 221 include a first tab 221a and a second tab 221b. The polarities of the first tab 221a and the second tab 221b are opposite. For example, when the first tab 221a is a positive tab, the second tab 221b is a negative tab.

[0109] In the embodiment of the present application, the adapter 24 is electrically connected to the tab 221 and the electrode terminal 23, so that the tab 221 and the electrode terminal 23 can be connected, so that the current can flow into or out of the electrode assembly 22. One or more adapters 24 can be provided, and the adapter 24 can be provided between the tab 221 and the electrode terminal 23. The first tab 221a of the electrode assembly 22 is connected to one electrode terminal through one adapter 24, and the second tab 221b of the electrode assembly 22 is connected to another electrode terminal through another adapter 24. For example, the positive electrode terminal 23a is connected to the positive tab through one adapter 24, and the negative electrode terminal 23b is connected to the negative tab through another adapter 24.

[0110] In the embodiment of the present application, the first side 241 of the adapter sheet 24 is provided with an insulating layer, and the first side may be the surface of the adapter sheet 24 closest to the first wall 201. It should be understood that the adapter sheet 24 is a sheet structure with a certain thickness, and the side of the adapter sheet 24 refers to the surface parallel to the thickness direction of the adapter sheet, wherein the first side 241 is the surface closest to the first wall 201 among all the side surfaces of the adapter sheet 24. Since the outer shell 21 of the battery cell 20 is conductive and even charged itself, some areas of the adapter sheet 24 are close to the outer shell 21 of the battery cell 20, especially the distance between the adapter sheet 24 and the larger surface of the outer shell 21 is very small, and there is no insulating protective layer between the two, and the local discharge phenomenon is serious here. Therefore, by providing an insulating layer here, the mutual discharge between the adapter sheet and the outer shell can be blocked to a certain extent, thereby improving the high-voltage resistance of the battery cell and reducing the risk of the outer shell being broken down by high voltage and causing the insulation failure of the battery cell.

[0111] In addition, for the convenience of description, the present embodiment defines three reference directions for the rectangular battery cell 20. The thickness direction of the battery cell 20 is direction X, the height direction of the battery cell 20 is direction Z, and the length direction of the battery cell 20 is direction Y, wherein the thickness direction Y, height direction Z, and length direction X of the battery cell 20 are perpendicular to each other, and the thickness direction Y dimension of the battery cell 20 is smaller than the length direction X dimension.

[0112] The insulating layer can be arranged in different ways. For example, the insulating layer can be arranged on other sides of the adapter. Figures 4 to 6 As shown, Figures 4 to 6 Different position settings of the insulating layer on the adapter are shown respectively. Figure 4 The schematic diagram of the structure of the adapter sheet of the embodiment of the present application is shown. Figure 4 Can be Figure 3 The schematic structural diagram of the adapter sheet 24 in the battery cell 20 shown in FIG. 2 along the X direction; Figure 5 Another structural schematic diagram of the adapter sheet of the embodiment of the present application is shown in FIG. Figure 5 Can be Figure 3 Another structural schematic diagram of the adapter sheet 24 in the battery cell 20 shown; Figure 6 This is another structural schematic diagram of the adapter sheet of the embodiment of the present application. For example, Figure 6 Can be Figure 3 Another structural schematic diagram of the adapter plate 24 in the battery cell 20 is shown.

[0113] In some embodiments, Figure 4 and Figure 5As shown, the adapter plate 24 includes a pole tab connection surface 242 electrically connected to the pole tab 221, and an electrode terminal connection surface 243 electrically connected to the electrode terminal 23, and the first side surface 241 is perpendicular to the pole tab connection surface 242, and / or the first side surface 241 is perpendicular to the electrode terminal connection surface 243. It should be understood that the pole tab connection surface 242 and the electrode terminal connection surface 243 can be on the same plane or on different planes. The pole tab connection surface 242 and the electrode terminal connection surface 243 can be two parallel surfaces or two perpendicular surfaces to each other. For ease of explanation, this embodiment is mainly described by taking the pole tab connection surface 242 and the electrode terminal connection surface 243 as an example of being parallel to each other. For example, as Figures 4 to 6 As shown, the tab connection surface 242 and the electrode terminal connection surface 243 are located on both sides of the adapter sheet 24 along its thickness direction, wherein the thickness direction of the adapter sheet 24 in the embodiment of the present application may be the height direction Z of the battery cell 20 .

[0114] It should be understood that in general settings, an insulating member is often provided between the electrode terminal connection surface 243 of the adapter 24 and the electrode terminal 23, and an insulating member is also provided between the tab connection surface 242 of the adapter 24 and the tab 221, so as to achieve electrical insulation between the adapter 24 and the cover plate 212 or the electrode assembly 22. However, there is often local discharge on the side of the adapter 24, resulting in electrical breakdown of the shell very close to it, causing the conductive liquid or gas inside the battery cell to leak to the outside of the battery cell. Therefore, by providing an insulating layer on the side of the adapter 24 that is perpendicular to the electrode terminal connection surface 243 and the tab connection surface 242, the high voltage resistance of the battery cell can be improved, and the safety performance of the battery cell can be improved.

[0115] In some embodiments, Figure 5 As shown, all sides of the adapter 24 can be provided with an insulating layer. It should be understood that all surfaces parallel to the thickness direction of the adapter 24 can be referred to as side surfaces, wherein the side surfaces include the first side surface 241. Generally speaking, the side surfaces are arranged perpendicular to the tab connection surface 242 or the electrode terminal connection surface 243. By providing an insulating layer on all sides of the adapter 24, the risk of partial discharge between any side of the adapter 24 and the outer shell 21 causing the outer shell 21 to be punctured can be further reduced, thereby improving the high-voltage resistance of the battery cell.

[0116] In some embodiments, a portion of the area can be extended from the side of the adapter sheet 24 to the tab connection surface 242 or the electrode terminal connection surface 243 so that the insulating layer can completely wrap the side. Figure 6As shown, the insulating layer can also extend to the tab connection surface 242 and the electrode terminal connection surface 243 of the adapter 24, covering the edge portions of the tab connection surface 242 and the electrode terminal connection surface 243. By extending the insulating layer to other connection surfaces, the side of the adapter 24 is completely covered, which can reduce the probability of partial discharge in the transition area from the side to the connection surface, further improve the insulation performance between the adapter and the shell, and enhance the high voltage resistance of the battery cell.

[0117] According to some embodiments of the present application, the adapter sheet 24 can be configured in various shapes such as a rectangle, a circle, or a polygon. Figure 3 , and please refer to Figure 7 and Fig. 9 , Figures 7 to 9 The structures of the adapter sheets 24 of different shapes are shown respectively. Figure 7 Another structural schematic diagram of the adapter sheet of the embodiment of the present application is shown. Figure 7 Can be Figure 3 Another structural schematic diagram of the adapter sheet 24 in the battery cell 20 shown; Figure 8 is a schematic diagram of the side structure of the adapter sheet of the embodiment of the present application, for example, Figure 8 Can be Figure 7 The schematic diagram of the side structure of the adapter plate 24 in the battery cell 20 is shown.

[0118] The shape of the adapter sheet can be changed accordingly according to the structural form and positional relationship between the tab 221 and the electrode terminal 23 in the battery cell 20. Figure 7 As shown, the adapter 24 has an upwardly protruding structure in addition to the main body, and the top surface of the protruding portion serves as the electrode terminal connection surface 243 to be electrically connected to the electrode terminal 23 . The adapter 24 also has two wings so as to be electrically connected to the tab 221 .

[0119] In some embodiments, the insulating layer may cover almost all areas of the transfer sheet 24. Fig. 9 and Fig.10 As shown, Fig. 9 Another structural schematic diagram of the adapter sheet of the embodiment of the present application is shown. Fig. 9 Can be Figure 3 Another structural schematic diagram of the adapter sheet 24 in the battery cell 20 shown in FIG. Fig. 9 It may be a top view of the adapter sheet 24 in the direction from the electrode terminal connection surface 243 to the tab connection surface 242; Fig.10 Another structural schematic diagram of the adapter sheet of the embodiment of the present application is shown. Fig.10 Can be Figure 3 Another structural schematic diagram of the adapter sheet 24 in the battery cell 20 shown in FIG. Fig.10 It may be a bottom view of the adapter sheet 24 in the direction from the tab connection surface 242 to the electrode terminal connection surface 243 .

[0120] like Fig. 9 and Fig.10 As shown, the tab connection surface 242 is provided with a tab welding area 2421, and the electrode terminal connection surface 243 is provided with an electrode terminal welding area 2431, and the insulating layer covers all areas of the adapter 24 except the tab welding area 2421 and the electrode terminal welding area 2431. It should be understood that the tab connection surface 242 and the electrode terminal connection surface 243 can be located on two surfaces of the adapter 24 that are perpendicular to the thickness direction. Figure 8 As shown, the insulating layer can cover all sides of the adapter 24. In addition to the area where the adapter 24 is connected to the tab and the electrode terminal, the insulating layer also covers other areas on the tab connection surface 242 and the electrode terminal connection surface 243.

[0121] It should be understood that the tab welding area 2421 is the area where the adapter 24 is electrically connected to the tab 221, and the electrode terminal welding area 2431 is the area where the adapter 24 is electrically connected to the electrode terminal 23. The electrically connected area on the adapter 24 can be connected to the tab 221 and the electrode terminal 23 respectively by welding or the like, so that the current can flow between the tab 221 and the electrode terminal 23 through the adapter 24. By covering all areas of the adapter except the area to be welded with an insulating layer, the electrical conduction between the adapter 24 and other charged structures in the battery cell 20, such as the housing 211, the cover plate 212 and other structures in the battery cell 20 that may be charged, can be blocked. Since there is an insulating layer between the adapter 24 and other charged structures, the phenomenon of local discharge between the two is reduced, and the high voltage resistance of the battery cell is improved.

[0122] In some embodiments, the breakdown strength of the insulating layer The following relationship can be satisfied between the thickness t of the insulating layer:

[0123] in, is the relative dielectric constant, which is a physical parameter used to represent the dielectric properties or polarization properties of dielectric materials; and is a constant, for example, in some settings, Can be , Can be . Relative dielectric constant Measurements can be made using an electrostatic field, for example by first testing the capacitance of a capacitor with air between its plates. Then, using the same distance between the capacitor plates but adding a dielectric between the plates, the capacitance is Finally, through and The ratio between them gives the relative dielectric constant.

[0124] In order to alleviate the risk of insulation failure caused by the breakdown of the battery cell shell, a certain distance can be reserved between the adapter and the shell in the design. For example, in the design of the battery cell 20 in which the adapter 24 is not immersed in the electrolyte, in order to enable the battery cell 20 to withstand the reverse high voltage of 200V, the distance between the adapter 24 and the shell 21 can be designed to be more than 8mm; and in the design of the battery cell 20 in which the adapter 24 is immersed in the electrolyte, the distance between the adapter 24 and the shell 21 needs to be designed to be more than 19mm to withstand the reverse high voltage of 200V. However, the distance between the adapter 24 and the shell 21 is designed to be too large, which makes the energy density of the battery cell 20 low, affecting the performance of the battery in all aspects. Therefore, by setting a certain thickness for the insulating layer, when the battery cell 20 is applied with a reverse high voltage, the breakdown voltage between the adapter 24 and the shell 21 can be increased, the risk of the battery cell 20 being broken down can be reduced, and the safety performance of the battery cell 20 can be improved.

[0125] It should be understood that the breakdown strength of the insulating layer Refers to the highest electric field strength that the insulating layer can withstand to avoid breakdown under the action of the electric field. The breakdown strength can also be called the dielectric breakdown strength, and the unit can be expressed in KV / m. The breakdown strength test method can be tested by DC voltage, AC voltage or pulse voltage. For example, the DC voltage breakdown strength test method uses high-voltage power supply, voltmeter, ammeter, discharge tube and other test equipment to adjust the output voltage and current of the high-voltage power supply, as well as the discharge time of the discharge tube and other parameters according to the characteristics of the insulation layer and the test requirements. Observe whether the adapter coated with the insulation layer has electrical breakdown within the specified time, and record the breakdown voltage value.

[0126] In some embodiments, the value range of the thickness t of the insulating layer is [2μm, 2mm], or the value range of the thickness t of the insulating layer can also be set to [2μm, 0.2mm]. When the thickness t of the insulating layer is set to be greater than or equal to 2μm, the insulating layer can still maintain effective insulation performance under a reverse high voltage of 200V, reducing the risk of the adapter 24 breaking through the shell 21; and when the thickness t of the insulating layer is set to be less than or equal to 2mm, or further, when the thickness t of the insulating layer is set to be less than or equal to 0.2mm, the overall volume of the adapter 24 can be reduced, thereby reducing the internal space of the battery cell 20 occupied by the adapter 24 and improving the energy density of the battery cell.

[0127] In some embodiments, the thickness t of the insulating layer can be any of the following values ​​or between any two of the following values: 2μm, 5μm, 8μm, 10μm, 20μm, 25μm, 30μm, 100μm, 200μm, 250μm, 350μm, 500μm, 700μm, 800μm, 1mm, 1.2mm, 1.5mm, 1.6mm, 1.8mm, 2mm.

[0128] For example, the thickness t of the insulating layer may be greater than 2 μm, or the thickness t of the insulating layer may be in the range of [2 μm, 100 μm], so that the adapter 24 can resist a reverse high voltage of at least 200 V; the thickness t of the insulating layer may be greater than 5 μm, or the thickness t of the insulating layer may be in the range of [5 μm, 200 μm], so that the adapter 24 can resist a reverse high voltage of at least 500 V; the thickness t of the insulating layer may be greater than 8 μm, or the thickness t of the insulating layer may be in the range of [8 μm, 250 μm], so that the adapter 24 can resist a reverse high voltage of at least 700 V; the thickness t of the insulating layer may be greater than 10 μm, or the thickness t of the insulating layer may be in the range of [10 μm , 350μm], so that the adapter 24 can withstand a reverse high voltage of at least 1000V; the thickness t of the insulating layer can be greater than 20μm, or the thickness t of the insulating layer can be in the range of [20μm, 500μm], so that the adapter 24 can withstand a reverse high voltage of at least 1500V; the thickness t of the insulating layer can be greater than 25μm, or the thickness t of the insulating layer can be in the range of [25μm, 700μm], so that the adapter 24 can withstand a reverse high voltage of at least 2000V; the thickness t of the insulating layer can be greater than 30μm, or the thickness t of the insulating layer can be in the range of [30μm, 800μm], so that the adapter 24 can withstand a reverse high voltage of at least 2300V.

[0129] It should be understood that the thickness of the insulating layer may refer to the thickness of the insulating layer on a certain surface of the adapter sheet 24 in a direction perpendicular to the surface. Figure 6 As shown, the thickness of the insulating layer on the first side surface 241 of the adapter 24 refers to the thickness of the insulating layer on the first side surface 241 along the X direction, and the thickness of the insulating layer on the electrode terminal connecting surface 243 of the adapter 24 refers to the thickness of the insulating layer on the electrode terminal connecting surface 243 along the Z direction.

[0130] In some embodiments, the breakdown voltage of the insulating layer is greater than 200V, the thickness t of the insulating layer may be greater than 2μm, or the thickness t of the insulating layer may be in the range of [2μm, 100μm]; or, the breakdown voltage of the insulating layer is greater than 500V, the thickness t of the insulating layer may be greater than 5μm, or the thickness t of the insulating layer may be in the range of [5μm, 200μm]; or, the breakdown voltage of the insulating layer is greater than 700V, the thickness t of the insulating layer may be greater than 8μm, or the thickness t of the insulating layer may be in the range of [8μm, 250μm]. It should be understood that the relationship between the breakdown voltage of the insulating layer and its thickness t can be expressed as the thickness t of the insulating layer may be greater than 2μm, so that the adapter 24 can withstand a reverse high voltage of at least 200V; or, the thickness of the insulating layer The thickness t of the insulating layer can be greater than 5 μm, so that the adapter 24 can withstand at least 500 V of reverse high voltage; or the thickness t of the insulating layer can be greater than 8 μm, so that the adapter 24 can withstand at least 700 V of reverse high voltage. By setting the corresponding value range of the insulating layer thickness under different conditions, the appropriate insulating layer thickness can be selected according to the actual system structure. When the battery cell is applied with reverse high voltage, the breakdown voltage between the adapter and the shell can be increased, thereby improving the safety performance of the battery cell.

[0131] In some embodiments, the material of the insulating layer can be some materials with electrical insulation properties. When the battery cell 20 is subjected to reverse high voltage, the surface of the adapter 24 can prevent the discharge arc outside the adapter due to the insulating layer, thereby avoiding the breakdown of other structures in the battery cell. The material of the insulating layer can use inorganic materials, such as: glass fiber, mica, ceramics, etc.; or the material of the insulating layer can use organic materials, such as: silicone, polytetrafluoroethylene, polyester, polyimide, rubber, polyethylene, epoxy resin, silicone rubber, polyvinyl chloride, etc.; or the material of the insulating layer can be a composite material, such as a composite material of glass fiber, mica, ceramics, etc. and organic materials. The material of the insulating layer can include one or more of glass fiber, mica, ceramics, silicone, polytetrafluoroethylene, polyester, polyimide, rubber, polyethylene, epoxy resin, silicone rubber, polyvinyl chloride. The insulating layer can be covered on the adapter 24 by spraying, bonding, mechanical riveting, in-situ growth or hot melting. The insulating layer can be a separately manufactured sheet structure bonded to the surface of the adapter. Alternatively, during the manufacturing process, the insulating layer can also be directly sprayed on the surface of the adapter. For example, the insulating layer can be coated on the surface of the adapter by thermal spraying, electrostatic spraying, electrostatic fluidized bed, fluidized bed dipping, etc.

[0132] According to some embodiments of the present application, the present application further provides a transfer sheet 24 for a battery cell 20, the battery cell 20 includes a tab 221 and an electrode terminal 23, the transfer sheet 24 includes: a tab connection surface 242 electrically connected to the tab 221, an electrode terminal connection surface 243 electrically connected to the electrode terminal 23, and a first side surface 241, the first side surface 241 is provided with an insulating layer, the first side surface 241 is perpendicular to the tab connection surface 242, and / or the first side surface 241 is perpendicular to the electrode terminal connection surface 243. In some embodiments, the transfer sheet 24 described in any of the above schemes is also included.

[0133] According to some embodiments of the present application, the present application further provides a battery device 10, comprising a battery cell 20 as described in any of the above schemes. For example, the battery cell 20 may include: a housing 21, an electrode assembly 22, an electrode terminal 23 and a switching sheet 24. The battery device 10 may be used to provide voltage and capacity.

[0134] According to some embodiments of the present application, the present application further provides an energy storage device, including a battery cluster, the battery cluster including the battery cell 20 described in any of the above schemes. For example, the battery cell 20 may include: a housing 21, an electrode assembly 22, an electrode terminal 23 and a switching plate 24. The battery cluster can increase the voltage and capacity of the energy storage device.

[0135] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery device 10 described in any of the above schemes, and the battery device 10 is used to provide electrical energy to the electrical device.

[0136] The power-consuming device may be any of the aforementioned devices or systems using a battery device.

[0137] According to some embodiments of the present application, see Figures 3 to 9 The present application provides a battery cell, comprising: a housing 21, an electrode assembly 22, an electrode terminal 23 and a transfer sheet 24. The housing 21 has a receiving space 2111; the electrode assembly 22 is received in the receiving space 2111 of the housing 21, and the electrode assembly 22 comprises a tab 221; the electrode terminal 23 is disposed on the housing 21; the transfer sheet 24 is electrically connected to the tab 221 and to the electrode terminal 23; wherein the transfer sheet 24 comprises a tab connection surface 242 electrically connected to the tab 221, and an electrode terminal connection surface 243 electrically connected to the electrode terminal 23, a tab welding area 2421 is disposed on the tab connection surface 242, and an electrode terminal welding area 2431 is disposed on the electrode terminal connection surface 243, and an insulating layer covers all areas of the transfer sheet 24 except the tab welding area 2421 and the electrode terminal welding area 2431.

[0138] The breakdown strength of the insulation layer The thickness t of the insulating layer satisfies the relationship:

[0139] in, is the relative dielectric constant, and is a constant, among which, Can be , Can be .

[0140] The thickness t of the insulating layer ranges from [2 μm to 0.2 mm].

[0141] The breakdown voltage of the insulating layer is greater than 200V, and the thickness t is greater than 2μm; or, the breakdown voltage of the insulating layer is greater than 500V, and the thickness t is greater than 5μm; or, the breakdown voltage of the insulating layer is greater than 700V, and the thickness t is greater than 8μm.

[0142] The material of the insulating layer may include one or more of glass fiber, mica, ceramic, silicone, polytetrafluoroethylene, polyester, polyimide, rubber, polyethylene, epoxy resin, silicone rubber, and polyvinyl chloride.

[0143] The insulating layer can be covered on the adapter sheet by spraying, bonding, mechanical riveting, in-situ growth or hot melting.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing (21), the housing (21) having a receiving space (2111), and the housing (21) comprising a first wall (201); An electrode assembly (22), the electrode assembly (22) being accommodated in the accommodation space (2111) of the housing (21), the electrode assembly (22) comprising an electrode lug (221); an electrode terminal (23), the electrode terminal (23) being arranged on the housing (21); A transfer plate (24), the transfer plate (24) being electrically connected to the electrode tab (221) and to the electrode terminal (23); The first side surface (241) of the adapter plate (24) is provided with an insulating layer, the first side surface (241) is the surface of the adapter plate (24) closest to the first wall (201), and the first wall (201) is the wall with the largest area of ​​the housing (21).

2. The battery cell according to claim 1, characterized in that: The adapter plate (24) comprises a pole lug connection surface (242) electrically connected to the pole lug (221), and an electrode terminal connection surface (243) electrically connected to the electrode terminal (23), the first side surface (241) being perpendicular to the pole lug connection surface (242), and / or the first side surface (241) being perpendicular to the electrode terminal connection surface (243).

3. The battery cell according to claim 2, characterized in that: All side surfaces of the adapter plate (24) are provided with an insulating layer, the side surfaces including the first side surface (241).

4. The battery cell according to claim 2 or 3, characterized in that: The insulating layer extends toward the tab connection surface (242) and the electrode terminal connection surface (243) of the adapter sheet (24), covering edge portions of the tab connection surface (242) and the electrode terminal connection surface (243).

5. The battery cell according to claim 2 or 3, characterized in that: A pole lug welding area (2421) is provided on the pole lug connection surface (242), an electrode terminal welding area (2431) is provided on the electrode terminal connection surface (243), and the insulating layer covers all areas of the adapter sheet (24) except the pole lug welding area (2421) and the electrode terminal welding area (2431).

6. The battery cell according to any one of claims 1 to 3, characterized in that: The breakdown strength of the insulating layer The thickness t of the insulating layer satisfies the relationship: in, is the relative dielectric constant, and is a constant.

7. The battery cell according to any one of claims 1 to 3, characterized in that: The thickness t of the insulating layer ranges from [2 μm to 2 mm].

8. The battery cell according to any one of claims 1 to 3, characterized in that: The thickness t of the insulating layer ranges from [2 μm to 0.2 mm].

9. The battery cell according to any one of claims 1 to 3, characterized in that: The breakdown voltage of the insulating layer is greater than 200V, and the thickness t is greater than 2 μm; or, The breakdown voltage of the insulating layer is greater than 500V, and the thickness t is greater than 5 μm; or, The breakdown voltage of the insulating layer is greater than 700V, and the thickness t is greater than 8 μm.

10. The battery cell according to any one of claims 1 to 3, characterized in that: The material of the insulating layer includes one or more of glass fiber, mica, ceramic, silica gel, polytetrafluoroethylene, polyester, polyimide, rubber, polyethylene, epoxy resin, silicone rubber, and polyvinyl chloride.

11. The battery cell according to any one of claims 1 to 3, characterized in that: The insulating layer is covered on the adapter sheet (24) by spraying, bonding, mechanical riveting, in-situ growth or hot melting.

12. An adapter sheet for a battery cell, characterized in that: The battery cell comprises a pole lug (221) and an electrode terminal (23), and the adapter sheet (24) comprises: a pole lug connection surface (242) electrically connected to the pole lug (221), an electrode terminal connection surface (243) electrically connected to the electrode terminal (23), and a first side surface (241); The first side surface (241) is provided with an insulating layer, the first side surface (241) is perpendicular to the tab connection surface (242), and / or the first side surface (241) is perpendicular to the electrode terminal connection surface (243).

13. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 11.

14. An energy storage device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 11 or a plurality of battery devices according to claim 13, wherein the battery cells or the battery devices are used for storing or providing electric energy.

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