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

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, an energy storage device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell and comprises a pole piece and a diaphragm, a positive pole piece in the pole piece comprises a positive current collector body and a positive pole lug connected with the positive current collector body, a coating layer, an insulating layer and a cementing layer are arranged on the surface of the positive current collector body, and the insulating layer is arranged on the surface of the coating layer. And the insulating layer positioned between the coating layer and the positive pole lug is provided with the cementing layer bonded with the diaphragm. According to the invention, the condition that the non-welded area of the lug root part is pressed between the positive pole piece and the negative pole piece can be reduced.

Description

Technical Field

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

[0002] During the assembly process of the electrode assembly, the un-welded area at the root of the tab is prone to deformation, and the un-welded area at the root of the tab is easily pressed between the positive electrode plate and the negative electrode plate, resulting in a short circuit inside the electrode assembly, and improvement is needed. Summary of the Utility Model

[0003] The present application provides a battery cell, a battery device, an energy storage device, and an electrical device to reduce the situation where the un-welded area at the root of the tab is pressed between the positive electrode plate and the negative electrode plate.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, including: a housing and an electrode assembly, the electrode assembly is accommodated in the housing and includes electrode plates and a separator. The positive electrode plate among the electrode plates includes a positive current collector body and a positive tab connected to the positive current collector body. A coating layer, an insulating layer, and an adhesive layer are provided on the surface of the positive current collector body, and the insulating layer located between the coating layer and the positive tab is provided with the adhesive layer bonded to the separator.

[0005] In the above technical solution, by providing an adhesive layer on the insulating layer located between the coating layer and the positive tab, the adhesive layer can be melted to bond the insulating layer of the positive electrode plate to the separator, thereby improving the safety performance of the battery cell in the case where the un-welded area at the root of the tab is inserted into the electrode assembly.

[0006] In some embodiments, the insulating layer is disposed on both sides of the coating layer along the width direction of the positive current collector body, and the insulating layers disposed on both sides of the coating layer are both bonded to the separator through the adhesive layer.

[0007] In some embodiments, the orthographic projection of the insulating layer on the positive current collector body is located within the orthographic projection of the adhesive layer on the positive current collector body.

[0008] In some embodiments, the orthographic projection of the adhesive layer on the positive current collector body and the orthographic projection of the coating layer on the positive current collector body have an overlapping area.

[0009] In some embodiments, the orthographic projection of the adhesive layer along the thickness direction of the positive current collector body on the projection plane does not coincide with the orthographic projection of the positive tab along the thickness direction of the positive current collector body on the projection plane.

[0010] In some embodiments, the side of the adhesive layer facing away from the insulating layer is higher than the side of the coating layer facing away from the positive current collector body in the thickness direction of the positive current collector body.

[0011] In some embodiments, it satisfies: 10 μm ≤ H1 ≤ 50 μm, where H1 is the thickness of the adhesive layer in the thickness direction of the positive current collector body; and / or,

[0012] It satisfies: 0 mm ≤ n1 ≤ 1 mm, where n1 is the difference between the length of the insulating layer in the length direction of the positive current collector body and the length of the adhesive layer in the length direction of the positive current collector body.

[0013] In some embodiments, the adhesive layer is a hot melt adhesive layer or a hot melt adhesive tape.

[0014] In a second aspect, an embodiment of the present application provides a battery device, including: a plurality of battery cells according to any one of the above embodiments.

[0015] In a third aspect, an embodiment of the present application provides an energy storage device, including: a plurality of battery cells according to any one of the above embodiments or a plurality of battery devices according to any one of the above embodiments, and the battery cells or the battery devices are used to store or provide electrical energy.

[0016] In a fourth aspect, an embodiment of the present application provides an electrical device, including: a battery cell according to any one of the above embodiments, a battery device according to any one of the above embodiments, or an energy storage device according to any one of the above embodiments, and the battery cell or the battery device is used to store or provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of an energy storage system provided by some embodiments of the present application;

[0019] Figure 2 It is a schematic structural diagram of a charging network provided by some embodiments of the present application;

[0020] Figure 3 It is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0021] Figure 4Explosion structure diagram of the battery device provided by some embodiments of the present application;

[0022] Figure 5 One of the schematic structural diagrams of the electrode assembly provided by some embodiments of the present application;

[0023] Figure 6 Another schematic structural diagram of the electrode assembly provided by some embodiments of the present application;

[0024] Figure 7 One of the schematic structural diagrams of the positive electrode tab provided by some embodiments of the present application;

[0025] Figure 8 Another schematic structural diagram of the positive electrode tab provided by some embodiments of the present application.

[0026] Reference numerals:

[0027] Energy storage device 1, power conversion device 2, power generation device 3, charging pile 4, connector 5;

[0028] Vehicle 1000;

[0029] Battery device 100;

[0030] Box body 10, first box body 11, second box body 12;

[0031] Battery cell 20, electrode assembly 22, positive electrode tab 221, positive current collector body 2211, coating layer 22111, insulating layer 22112, bonding layer 22113, positive electrode tab 2212, negative electrode tab 222, separator 223;

[0032] Controller 200; motor 300. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; 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" and any variations thereof in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0035] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0036] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0038] The "plurality" mentioned in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0039] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used after being charged after discharging the battery cell.

[0040] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of this application do not limit this.

[0041] The battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto. Generally, battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells and pouch battery cells, and the embodiments of the present application are not limited thereto.

[0042] The battery cell includes a housing, an electrode assembly and an electrolyte, and the housing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode plate, a negative electrode plate and a separator. The battery cell mainly works by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive coating layer. The positive current collector includes a positive current collector body and a positive tab. The positive coating layer is coated on the surface of the positive current collector body, and the positive tab is not coated with the positive coating layer and protrudes from the positive current collector body. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative coating layer. The negative current collector includes a negative current collector body and a negative tab. The negative coating layer is coated on the surface of the negative current collector body, and the negative tab is not coated with the negative coating layer and protrudes from the negative current collector body. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that a large current can pass through without fusing, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together.

[0043] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0044] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles and spaceships, etc. The battery cell is used to store or provide electrical energy.

[0045] The inventors have found that in related technologies, multi-tab battery technologies are commonly used for battery cells. By end-welding the multi-tabs to form a tab bundle and connecting the tab bundle to the electrode terminal, the current density inside the electrode assembly can be effectively reduced, the risk of local overheating can be reduced, and the thermal stability and cycle life of the battery cell can be improved. In addition, the multi-tab design can also reduce the internal resistance of the electrode assembly and increase the power density of the battery cell to meet the requirements of high-power output. However, during the assembly process of the electrode assembly, the unwelded area at the tab root is prone to deformation, and the unwelded area at the tab root is easily pressed between the positive electrode plate and the negative electrode plate, resulting in an internal short circuit in the electrode assembly and further causing problems such as low voltage. Therefore, how to effectively reduce tab insertion has become an urgent problem to be solved.

[0046] Based on the above considerations, in order to solve the problem that the unwelded area at the tab root is pressed between the positive electrode plate and the negative electrode plate, the inventors have conducted in-depth research and designed a battery cell, which includes a housing and an electrode assembly. The electrode assembly is accommodated in the housing and includes electrode plates and a separator. The positive electrode plate in the electrode plates includes a positive current collector body and a positive tab connected to the positive current collector body. A coating layer, an insulating layer, and a bonding layer are provided on the surface of the positive current collector body. The insulating layer located between the coating layer and the positive tab is provided with a bonding layer for bonding with the separator, and the orthographic projection of the bonding layer on the positive current collector body and the orthographic projection of the insulating layer on the positive current collector body have an overlapping area.

[0047] In the battery cell with this structure, by providing a bonding layer on the insulating layer located between the coating layer and the positive tab, the insulating layer of the positive electrode plate can be bonded to the separator, thereby reducing the situation where the unwelded area at the tab root is inserted into the inside of the electrode assembly and improving the safety performance of the battery cell.

[0048] 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 a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0049] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0050] As an example, the battery cell assembly may be a battery module, and the battery module 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 with a cable tie.

[0051] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0052] As an example, the battery cell assembly may be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0053] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0054] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0055] 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.

[0056] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0057] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc. The battery device is used to store or provide electrical energy.

[0058] The embodiments of the present application provide an energy storage device, which includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices, and the plurality of 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 a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0059] 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, 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 low electricity consumption periods and provide electrical energy to relevant users or electrical devices during high electricity consumption periods. The energy storage system provided by the embodiments of the present application can be any power system that requires an energy storage device.

[0060] In some embodiments, the energy storage device is an energy storage container or an energy storage electrical cabinet.

[0061] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0062] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a total control module, a power distribution module, and a fire protection module.

[0063] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides coolant for adjusting the temperature of battery cells to each battery device through pipelines.

[0064] As an example, the main control module may serve as the battery management unit of the battery cluster for monitoring and managing the battery cluster. The main control module may monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch, and other modules.

[0065] As an example, the total control module may serve as the battery management unit of the energy storage device for monitoring and managing the energy storage device. The total control module may monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device. As an example, the total control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a main battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and a fiber optic conversion module, and other modules.

[0066] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage system.

[0067] As an example, the power distribution device may be used to distribute power to the power consumption modules of the energy storage device.

[0068] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using energy storage devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc. The energy storage device is used to store or provide electric energy.

[0069] In some embodiments, such as Figure 1As shown in the figure, the energy storage system may include one or more energy storage devices 1 and a power conversion device 2 (Power Converter System, abbreviated as PCS). The power conversion device 2 is used to connect between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electric energy, and the electric energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power conversion device 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. Among them, the specific type of the power generation device 3 is not limited in this application.

[0070] The technical solutions described in the embodiments of this application are applicable to various electrical devices using an energy storage system. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc. The energy storage device is used to store or provide electric energy.

[0071] Please refer to Figure 2 , the embodiments of this application provide a charging network, including a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, and the energy storage device 1 is used to provide electric energy for the charging pile 4. The charging pile 4 and the battery device in the energy storage device 1 are electrically connected through a cable, and the battery device can provide the electric energy stored in itself to the charging pile 4. The charging pile 4 has one or more connectors 5, and the connectors are used to connect with an electrical device (such as a vehicle), so as to replenish energy to the electrical device.

[0072] The energy storage device may be located inside the charging pile (such as an integrated charging and energy storage machine), or outside the charging pile.

[0073] The embodiments of this application provide an electrical device using a battery cell or a battery device or an energy storage device or an energy storage system as a power source. The electrical device may be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, and spacecrafts, etc. Among them, electric toys may include fixed or mobile electric toys. For example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecrafts may include airplanes, rockets, space shuttles, and spaceships, etc.

[0074] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device in an embodiment of this application, is taken as an example for description.

[0075] Please refer to Figure 3 , Figure 3Schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle. The battery device 100 can be arranged at the bottom, head, or tail of the vehicle. The battery device 100 can be used for power supply of the vehicle. For example, the battery device 100 can serve as the operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle.

[0076] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0077] Please refer to Figure 4 , Figure 4 Exploded view of the structure of the battery device 100 provided by some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of battery cells 20. The battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open. The first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0078] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a combined series-parallel configuration. The combined series-parallel configuration means that among the multiple battery cells 20, there are both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a combined series-parallel configuration, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery device 100 can also be such that multiple battery cells 20 are first connected in series, parallel, or in a combined series-parallel configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel configuration to form a whole and are accommodated in the box 10. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0079] Please refer to Figure 4 , Figure 4 , which is a partial structural schematic diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes multiple rows of battery cells 20 arranged along a first direction. Each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. The first direction and the second direction are the length direction and the width direction of the box 10 respectively, and the first direction and the second direction are perpendicular to each other.

[0080] According to some embodiments of the present application, referring to Figure 5 and Figure 6 , the present application provides a battery cell 20, including: a housing and an electrode assembly 22.

[0081] Among them, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited to this.

[0082] The electrode assembly 22 is accommodated in the housing and includes electrode plates and a separator 223. The positive electrode plate 221 among the electrode plates includes a positive electrode current collector body 2211 and a positive electrode tab 2212 connected to the positive electrode current collector body 2211. Refer to Figure 7 and Figure 8 .

[0083] Refer to Figure 6 , Figure 7 and Figure 8 , a coating layer 22111, an insulating layer 22112, and an adhesive layer 22113 are provided on the surface of the positive electrode current collector body 2211. The insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212 is provided with an adhesive layer 22113 for bonding with the separator 223.

[0084] Among them, refer to Figure 6, the insulating layers 22112 are disposed on both sides of the coating layer 22111 along the width direction of the positive current collector body 2211. The insulating layers 22112 are coated on the surface of the positive electrode plate 221, and the adhesive layer 22113 is disposed on the side of the insulating layer 22112 facing away from the positive current collector body 2211.

[0085] Exemplarily, referring to Figure 5 and Figure 6 , on the side surface of the positive current collector body 2211 along the thickness direction, the insulating layers 22112, the coating layer 22111 and the insulating layers 22112 are arranged in sequence along the width direction of the positive current collector body 2211.

[0086] The insulating layer 22112 can be an insulating region made of an insulating material. In the case where the un-welded region at the root of the tab is pressed between the positive electrode plate 221 and the negative electrode plate 222, the insulating layer 22112 can reduce the short-circuit risk caused by metal contact between the tab and the coating layer 22111.

[0087] The insulating material can be an AT11 (boehmite) material.

[0088] In some embodiments, referring to Figure 6 and Figure 7 , the coating width M1 of the insulating layer 22112 along the width direction of the positive current collector body 2211 satisfies: 5 mm ≤ M1 ≤ 10 mm, and the coating thickness H2 of the insulating layer 22112 along the thickness direction of the positive current collector body 2211 satisfies: 20 mm ≤ H2 ≤ 50 mm.

[0089] The widths and thicknesses of the insulating layers 22112 of different types of battery cells 20 are different. Exemplarily, the coating width M1 of the insulating layer 22112 along the width direction of the positive current collector body 2211 can be 5 mm, 6 mm, 8 mm or 10 mm, and the coating thickness H2 of the insulating layer 22112 along the thickness direction of the positive current collector body 2211 can be 20 mm, 26 mm, 38 mm, 45 mm or 50 mm.

[0090] Among them, referring to Figure 5 and Figure 6 , the adhesive layer 22113 is disposed on the side of the insulating layer 22112 facing away from the positive current collector body 2211, and the adhesive layer 22113 is used to paste the insulating layer 22112 and the separator 223.

[0091] Among them, the adhesive layer 22113 is disposed on the side of the insulating layer 22112 facing the separator 223, so that at least a part of the insulating layer 22112 is pasted to the separator 223.

[0092] In a battery cell with a single-sided tab, the positive electrode tab 221 includes a tab side and a strip side facing away from the tab side along the width direction of the positive current collector body 2211. The tab side of the positive electrode tab 221 is the side close to the positive electrode tab, and the strip side of the positive electrode tab 221 is the side away from the positive electrode tab.

[0093] Among them, the setting method of the adhesive layer 22113 has at least the following multiple methods:

[0094] First, the insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212 is bonded to the separator 223 through the adhesive layer 22113.

[0095] In this embodiment, the insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212 is bonded to the separator 223, which can seal the insertion entrance of the positive electrode tab 2212, reduce the situation where the un-welded area at the tab root is inserted into the electrode assembly 22, and at the same time reduce the situation where welding impurity particles enter between the separator 223 and the positive electrode tab 221, improve the reliability of the battery cell 20, and at the same time increase the adhesion between the tab side of the positive electrode tab 221 and the separator 223, thereby effectively reducing the risk of generating a gap between the positive electrode tab 221 and the negative electrode tab 222, improving the safety performance of the battery cell 20, and at the same time reducing the internal voids of the battery cell 20, improving the space utilization rate and energy density of the battery cell 20.

[0096] Second, referring to Figure 5 and Figure 6 , the insulating layer 22112 is disposed on both sides of the coating layer 22111 along the width direction of the positive current collector body 2211, and the insulating layers 22112 disposed on both sides of the coating layer 22111 are both bonded to the separator 223 through the adhesive layer 22113.

[0097] Among them, both the tab side and the strip side of the positive electrode tab 221 are pasted to the separator 223.

[0098] In this embodiment, both ends of the positive electrode tab 221 along the width direction are bonded to the separator 223. On the first hand, it can reduce the situation where the un-welded area at the tab root is inserted into the electrode assembly 22; on the second hand, it can reduce the situation where welding impurity particles enter between the separator 223 and the positive electrode tab 221, further improving the reliability of the battery cell 20; on the third hand, it can adapt to the structure of the battery cell 20 with double-sided tabs, increasing the usage scenarios; on the fourth hand, it can also increase the adhesion between both sides of the positive electrode tab 221 along the width direction and the separator 223, thereby effectively reducing the risk of generating a gap between the positive electrode tab 221 and the negative electrode tab 222, improving the safety performance of the battery cell 20, and at the same time reducing the internal voids of the battery cell 20, improving the space utilization rate and energy density of the battery cell 20.

[0099] According to the battery cell 20 provided by the embodiments of the present application, a bonding layer 22113 is provided on the insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212, so that the insulating layer 22112 of the positive electrode plate 221 can be bonded to the separator 223, thereby reducing the situation that the un-welded area at the root of the tab is inserted into the electrode assembly 22, and improving the safety performance of the battery cell 20.

[0100] In some embodiments, referring to Figure 5 and Figure 6 , the structures on both sides in the thickness direction of the positive current collector body 2211 are the same.

[0101] When the insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212 is bonded to the separator 223 through the bonding layer 22113, both ends of the positive electrode plate 221 along the thickness direction and facing the positive electrode tab 2212 are pasted to the separator 223, thereby further reducing the situation that the un-welded area at the root of the tab is inserted into the electrode assembly 22. At the same time, it can also reduce the situation that welding impurity particles enter between the separator 223 and the positive electrode plate 221 from the tab side, improve the reliability of the battery cell 20, and at the same time increase the bonding force between the tab side of the positive electrode plate 221 and the separator 223, thereby effectively reducing the risk of generating a gap between the positive electrode plate 221 and the negative electrode plate 222, improving the safety performance of the battery cell 20, and at the same time reducing the internal voids of the battery cell 20, improving the space utilization rate and energy density of the battery cell 20.

[0102] When the insulating layers 22112 respectively provided on both sides of the coating layer 22111 are both bonded to the separator 223 through the bonding layer 22113, both sides of the positive electrode plate 221 along the thickness direction are pasted to the separator 223, further reducing the situation that welding impurity particles enter between the separator 223 and the positive electrode plate 221, and improving the reliability of the battery cell 20; at the same time, it can adapt to the structure of the battery cell 20 with double-sided tabs, increasing the usage scenarios; at the same time, it can also increase the bonding force between both sides of the positive electrode plate 221 along the width direction and the separator 223, thereby effectively reducing the risk of generating a gap between the positive electrode plate 221 and the negative electrode plate 222, improving the safety performance of the battery cell 20, and at the same time reducing the internal voids of the battery cell 20, improving the space utilization rate and energy density of the battery cell 20.

[0103] In some embodiments, the bonding layer 22113 is a hot melt adhesive layer or a hot melt adhesive tape.

[0104] Among them, the glass transition temperature of the hot melt adhesive is between 40 - 200 °C. The hot melt adhesive has the characteristic of melting under heating conditions, and can be pressed and softened to its own thickness, so as to bond the end of the separator 223 and the positive electrode tab 221 together, thereby realizing the bonding of the insulating layer 22112 of the positive electrode tab 221 and the separator 223 to seal the insertion inlet of the positive electrode tab 221, reducing the situation that the un-welded area at the root of the tab is inserted into the inside of the electrode assembly 22. Since the hot melt adhesive has good adhesiveness and heat resistance,

[0105] In this embodiment, by using the hot melt adhesive material as the bonding layer 22113 to paste the insulating layer 22112 and the separator 223, the bonding layer 22113 can be melted in the hot pressing step, so that the insulating layer 22112 of the positive electrode tab 221 and the separator 223 are bonded, increasing the bonding force between the insulating layer 22112 of the positive electrode tab 221 and the separator 223, thereby effectively reducing the risk of generating a gap between the positive electrode tab 221 and the negative electrode tab 222, and reducing the risk of tab insertion. At the same time, the hot melt adhesive material can remain stable in a high-temperature environment, thereby improving the reliable performance of the battery cell 20.

[0106] Among them, the distribution relationship between the bonding layer 22113 and the insulating layer 22112 includes at least the following three types:

[0107] First, referring to Figure 6 , the orthographic projection of the insulating layer 22112 on the positive electrode current collector body 2211 is located within the orthographic projection of the bonding layer 22113 on the positive electrode current collector body 2211.

[0108] Among them, the width of the bonding layer 22113 along the width direction of the positive electrode current collector body 2211 can be greater than or equal to the width of the insulating layer 22112 along the width direction of the positive electrode current collector body 2211, and the length of the bonding layer 22113 along the length direction of the positive electrode current collector body 2211 can be equal to or greater than the length of the insulating layer 22112 along the length direction of the positive electrode current collector body 2211.

[0109] In other words, the area of the insulating layer 22112 is smaller than the area of the bonding layer 22113, and all areas of the insulating layer 22112 can be pasted to the separator 223 through the bonding layer 22113, further reducing the situation that the un-welded area at the root of the tab is inserted into the inside of the electrode assembly 22, and at the same time reducing the situation that welding impurity particles enter between the separator 223 and the positive electrode tab 221 from the tab side, improving the reliability of the battery cell 20.

[0110] In some embodiments, referring to Figure 6 , the orthographic projection of the bonding layer 22113 on the positive electrode current collector body 2211 and the orthographic projection of the coating layer 22111 on the positive electrode current collector body 2211 may have an overlapping area.

[0111] In this embodiment, the adhesive layer 22113 is vitrified during the hot pressing process. The thickness of the adhesive layer 22113 decreases and extends towards the area of the coating layer 22111, increasing the bonding area between the positive electrode plate 221 and the separator 223, improving the reliability of the bonding. At the same time, the distance between the separator 223 and the coating layer 22111 is reduced, enhancing the energy density of the battery cell 20.

[0112] In some embodiments, referring to Figure 6 , the orthographic projection of the adhesive layer 22113 on the projection plane along the thickness direction of the positive electrode current collector body 2211 does not coincide with the orthographic projection of the positive electrode tab 2212 on the projection plane along the thickness direction of the positive electrode current collector body 2211.

[0113] In this embodiment, the adhesive layer 22113 does not extend to the surface of the positive electrode tab 2212, thereby reducing the influence on the conductive area of the positive electrode tab 2212.

[0114] Second, referring to Figure 7 , the orthographic projection of the adhesive layer 22113 on the positive electrode current collector body 2211 and the orthographic projection of the insulating layer 22112 on the positive electrode current collector body 2211 have an overlapping area.

[0115] In other words, the orthographic projection of the adhesive layer 22113 on the positive electrode current collector body 2211 and the orthographic projection of the insulating layer 22112 on the positive electrode current collector body 2211 have an intersection.

[0116] Exemplarily, the orthographic projection of the adhesive layer 22113 on the positive electrode current collector body 2211 and the orthographic projection of the coating layer 22111 on the positive electrode current collector body 2211 may have an intersection; or, the orthographic projection of the adhesive layer 22113 on the projection plane along the thickness direction of the positive electrode current collector body 2211 and the orthographic projection of the positive electrode tab 2212 on the projection plane along the thickness direction of the positive electrode current collector body 2211 may have an intersection.

[0117] In this embodiment, the width of the adhesive layer 22113 along the width direction of the positive electrode current collector body 2211 may be smaller than the width of the insulating layer 22112 along the width direction of the positive electrode current collector body 2211, and the length of the adhesive layer 22113 along the length direction of the positive electrode current collector body 2211 may be equal to or greater than the length of the insulating layer 22112 along the length direction of the positive electrode current collector body 2211. This can not only achieve the bonding between the insulating layer 22112 and the separator 223, but also reduce the amount of hot melt adhesive in the adhesive layer 22113, lower the cost, reduce the risk of the adhesive layer 22113 extending to the positive electrode tab 2212 during the hot pressing process, and at the same time reduce the risk of welding impurities entering the positive electrode plate 221 and the separator 223.

[0118] Thirdly, the orthographic projection of the bonding layer 22113 on the positive electrode current collector body 2211 may completely coincide with the orthographic projection of the insulating layer 22112 on the positive electrode current collector body 2211.

[0119] Wherein, the width of the bonding layer 22113 along the width direction of the positive electrode current collector body 2211 may be equal to the width of the insulating layer 22112 along the width direction of the positive electrode current collector body 2211, and the length of the bonding layer 22113 along the length direction of the positive electrode current collector body 2211 may be equal to the length of the insulating layer 22112 along the length direction of the positive electrode current collector body 2211.

[0120] In this embodiment, it is possible to achieve the adhesion between all regions of the insulating layer 22112 and the separator 223, further reducing the risk of welding impurities entering the positive electrode plate 221 and the separator 223.

[0121] In this embodiment, the orthographic projection of the bonding layer 22113 on the projection plane along the thickness direction of the positive electrode current collector body 2211 does not coincide with the orthographic projection of the positive electrode tab 2212 on the projection plane along the thickness direction of the positive electrode current collector body 2211. The orthographic projection of the bonding layer 22113 on the projection plane along the thickness direction of the positive electrode current collector body 2211 does not coincide with the orthographic projection of the coating layer 22111 on the projection plane along the thickness direction of the positive electrode current collector body 2211.

[0122] In some embodiments, referring to Figure 6 , the side surface of the bonding layer 22113 facing away from the insulating layer 22112 is higher than the side surface of the coating layer 22111 facing away from the positive electrode current collector body 2211 along the thickness direction of the positive electrode current collector body 2211, so as to increase the reliability of the adhesion between the positive electrode current collector body 2211 and the separator 223.

[0123] It can be understood that the side surface of the coating layer 22111 facing away from the positive electrode current collector body 2211 and the side surface of the insulating layer 22112 facing away from the positive electrode current collector body 2211 are substantially in the same plane. The bonding layer 22113 is provided on the side surface of the insulating layer 22112 facing away from the positive electrode current collector body 2211, and the thickness of the bonding layer 22113 along the thickness direction of the positive electrode current collector body 2211 is the distance between the separator 223 and the coating layer 22111 on the positive electrode plate 221.

[0124] In some embodiments, referring to Figure 6 , the thickness H1 of the bonding layer 22113 along the thickness direction of the positive electrode current collector body 2211 satisfies: 10 μm ≤ H1 ≤ 50 μm.

[0125] Exemplarily, the thickness H1 of the bonding layer 22113 along the thickness direction of the positive electrode current collector body 2211 may be 10 μm, 20 μm, 25 μm, 40 μm or 50 μm, and may be specifically determined according to the type of the battery cell 20.

[0126] In this embodiment, by setting the thickness range of the adhesive layer 22113 in the thickness direction of the positive current collector body 2211, the distance between the separator 223 and the coating layer 22111 on the positive electrode plate 221 can be set, thereby improving the energy density of the battery cell 20.

[0127] In some embodiments, it satisfies: 110μm ≤ H1 + H2 ≤ 150μm, where H1 is the thickness of the adhesive layer 22113 in the thickness direction of the positive current collector body 2211, and H2 is the thickness of the insulating layer 22112 in the thickness direction of the positive current collector body 2211.

[0128] Exemplarily, the sum of H1 and H2 can be 110μm, 120μm, 125μm, 140μm or 150μm, and can be specifically determined according to the type of the battery cell 20.

[0129] In this embodiment, by setting the thickness sum range of the adhesive layer 22113 and the insulating layer 22112 in the thickness direction of the positive current collector body 2211, the distance between the separator 223 and the coating layer 22111 on the positive electrode plate 221 can be set, thereby improving the energy density of the battery cell 20.

[0130] In some embodiments, it satisfies: 0mm ≤ n1 ≤ 1mm, where n1 is the difference between the length N2 of the insulating layer 22112 in the length direction of the positive current collector body 2211 and the length N1 of the adhesive layer 22113 in the length direction of the positive current collector body 2211.

[0131] Exemplarily, n1 can be 0mm, 0.5mm, 0.8mm or 1mm. By setting the range of the difference in the lengths of the insulating layer 22112 and the adhesive layer 22113 in the length direction of the positive current collector body 2211, the adhesion length between the insulating layer 22112 and the separator 223 in the length direction of the positive current collector body 2211 can be increased, thereby reducing the situation where the un-welded area at the root of the tab inserts into the inside of the electrode assembly 22. At the same time, it can also reduce the situation where welding impurity particles enter between the separator 223 and the positive electrode plate 221 from the tab side, improving the reliability of the battery cell 20.

[0132] When n1 is 0mm, the length of the insulating layer 22112 in the length direction of the positive current collector body 2211 is equal to the length of the adhesive layer 22113 in the length direction of the positive current collector body 2211, which can improve the adhesion reliability between the insulating layer 22112 and the separator 223.

[0133] In some embodiments, the length N1 of the adhesive layer 22113 in the length direction of the positive current collector body 2211 satisfies: 5mm ≤ N1 ≤ 10mm;

[0134] Exemplarily, N1 can be 5 mm, 6 mm, 7 mm or 10 mm, and can be specifically determined according to the type and specification of the battery cell 20.

[0135] In some embodiments, the difference in width of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the width direction of the positive current collector body 2211 satisfies: 0 mm to 1 mm.

[0136] Exemplarily, the difference in width of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the width direction of the positive current collector body 2211 can be 0 mm, 0.1 mm, 0.5 mm or 1 mm, and can be specifically determined according to the type and specification of the battery cell 20.

[0137] In this embodiment, by setting the range of the difference in width of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the width direction of the positive current collector body 2211, the processing difficulty can be reduced.

[0138] In some embodiments, the difference in length of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the length direction of the positive current collector body 2211 satisfies: 0 mm to 1 mm.

[0139] Exemplarily, the difference in length of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the length direction of the positive current collector body 2211 can be 0 mm, 0.1 mm, 0.5 mm or 1 mm, and can be specifically determined according to the type and specification of the battery cell 20.

[0140] In this embodiment, by setting the range of the difference in length of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the length direction of the positive current collector body 2211, the processing difficulty can be reduced.

[0141] In some embodiments, the difference in thickness of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the thickness direction of the positive current collector body 2211 satisfies: 0 μm to 3 μm.

[0142] Exemplarily, the difference in thickness of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the thickness direction of the positive current collector body 2211 can be 0 mm, 0.5 mm, 1.5 mm or 3 mm, and can be specifically determined according to the type and specification of the battery cell 20.

[0143] In this embodiment, by setting the difference in thickness of the adhesive layers 22113 disposed on both sides of the coating layer 22111 along the thickness direction of the positive current collector body 2211, the processing difficulty can be reduced.

[0144] Refer to Figure 5 andFigure 6 , according to some embodiments of the present application, the present application provides a battery cell 20, which includes a housing and an electrode assembly 22. The electrode assembly 22 is accommodated in the housing and includes electrode plates and a separator 223. The positive electrode plate 221 among the electrode plates includes a positive current collector body 2211 and a positive electrode tab 2212 connected to the positive current collector body 2211. A coating layer 22111, an insulating layer 22112, and an adhesive layer 22113 are provided on the surface of the positive current collector body 2211. The insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212 is provided with an adhesive layer 22113 for bonding with the separator 223.

[0145] The side of the adhesive layer 22113 facing away from the insulating layer 22112 is higher than the side of the coating layer 22111 facing away from the positive current collector body 2211 in the thickness direction of the positive current collector body 2211.

[0146] The adhesive layer 22113 is a hot melt adhesive layer or a hot melt adhesive tape.

[0147] In the battery cell 20 with this structure, by providing the adhesive layer 22113 on the insulating layer 22112 located between the coating layer 22111 and the positive electrode tab 2212, on the premise of reducing the performance impact on the coating layer 22111 of the positive electrode plate 221, the adhesive layer 22113 can be melted in the hot pressing step to bond the insulating layer 22112 of the positive electrode plate 221 with the separator 223, thereby reducing the situation where the un-welded area at the root of the electrode tab is inserted into the electrode assembly 22 and improving the safety performance of the battery cell 20.

[0148] According to some embodiments of the present application, the present application further provides a processing method for a battery cell 20, including:

[0149] Step 1: Provide a positive electrode plate 221, which includes a positive current collector body 2211 and a positive electrode tab 2212 connected to the positive current collector body 2211. A coating layer 22111 and an insulating layer 22112 are provided on the surface of the positive current collector body 2211. The insulating layer 22112 is provided on both sides of the coating layer 22111 along the width direction of the positive current collector body 2211.

[0150] Step 2: Paste a hot melt adhesive tape or coat a hot melt adhesive on the insulating layer 22112 of the positive electrode plate 221 after die-cutting to form an adhesive layer 22113.

[0151] Step 3: Then stack the positive electrode plate 221 with the adhesive layer 22113 formed, the separator 223, and the negative electrode plate 222 in a normal manner.

[0152] In some embodiments, the thickness H1 of the adhesive layer 22113 in the thickness direction of the positive current collector body 2211 satisfies: 50 μm ≤ H1 ≤ 80 μm.

[0153] Exemplarily, H1 can be 50 μm, 55 μm, 60 μm, 75 μm or 80 μm, and can be specifically determined according to the type and specifications of the battery cell 20.

[0154] According to some embodiments of the present application, the present application also provides a battery device 100, and the battery device 100 includes a plurality of battery cells 20.

[0155] According to the battery cell 20 provided by the embodiments of the present application, the positive electrode tab 221 of the battery cell 20 is provided with an adhesive layer 22113 on the insulating layer 22112 between the coating layer 22111 and the positive electrode tab 2212. On the premise of reducing the performance influence of the coating layer 22111 of the positive electrode tab 221, the insulating layer 22112 of the positive electrode tab 221 can be adhered to the separator 223, thereby reducing the situation where the un-welded area at the root of the tab is inserted into the inside of the electrode assembly 22 and improving the safety performance of the battery cell 20.

[0156] According to some embodiments of the present application, the present application also provides an energy storage device 1. The energy storage device 1 includes a plurality of battery cells 20 according to any of the above solutions, and the battery cells 20 are used for storing or providing electric energy; or the energy storage device 1 includes a plurality of battery devices 100 according to any of the above solutions, and the battery devices 100 are used for storing or providing electric energy.

[0157] According to some embodiments of the present application, the present application also provides an energy storage system, and the energy storage system includes: a power conversion device 2 and the energy storage device 1 according to any of the above solutions, and the power conversion device 2 is used for electrically connecting the power generation device 3 and the energy storage device 1.

[0158] According to some embodiments of the present application, the present application also provides an electrical device. The electrical device includes a plurality of battery cells 20 according to any of the above solutions, and the battery cells 20 are used for storing or providing electric energy; or the electrical device includes a plurality of battery devices 100 according to any of the above solutions, and the battery devices 100 are used for storing or providing electric energy; or the electrical device includes a plurality of energy storage devices 1 according to any of the above solutions, and the battery cells 20 or the battery devices 100 are used for storing or providing electric energy; or the electrical device includes a plurality of energy storage systems according to any of the above solutions, and the battery cells 20 or the battery devices 100 are used for storing or providing electric energy.

[0159] The electrical device can be any of the foregoing devices or systems using the battery device 100.

[0160] According to some embodiments of the present application, the present application further provides a charging network, which includes a charging pile 4 and the energy storage device 1 or the energy storage system of any of the above solutions. The energy storage device 1 is used to provide electric energy for the charging pile 4.

[0161] The energy storage device 1 can be located inside the charging pile 4 (such as an integrated energy storage and charging machine), or outside the charging pile 4.

[0162] If there is no special instruction, all the implementation manners and optional implementation manners of the present application can be combined with each other to form a new technical solution.

[0163] If there is no special instruction, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0164] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing; An electrode assembly, accommodated within the housing, comprising electrode plates and a separator. The positive electrode plate among the electrode plates includes a positive current collector body and a positive electrode tab connected to the positive current collector body. A coating layer, an insulating layer, and an adhesive layer are provided on the surface of the positive current collector body. The insulating layer located between the coating layer and the positive electrode tab is provided with the adhesive layer for bonding with the separator.

2. The battery cell according to claim 1, wherein The insulating layer is disposed on both sides of the coating layer along the width direction of the positive current collector body, and the insulating layers disposed on both sides of the coating layer are both bonded to the separator through the adhesive layer.

3. The battery cell according to claim 1, wherein The orthographic projection of the insulating layer on the positive current collector body is located within the orthographic projection of the adhesive layer on the positive current collector body.

4. The battery cell according to claim 3, characterized in that, The orthographic projection of the adhesive layer on the positive current collector body and the orthographic projection of the coating layer on the positive current collector body have an overlapping area.

5. The battery cell according to claim 3, wherein The orthographic projection of the adhesive layer along the thickness direction of the positive current collector body on the projection plane does not overlap with the orthographic projection of the positive electrode tab along the thickness direction of the positive current collector body on the projection plane.

6. The battery cell according to claim 1, characterized in that, The side surface of the adhesive layer facing away from the insulating layer is higher than the side surface of the coating layer facing away from the positive current collector body along the thickness direction of the positive current collector body.

7. The battery cell according to claim 1, characterized in that, Satisfying: 10 μm ≤ H1 ≤ 50 μm, where H1 is the thickness of the adhesive layer along the thickness direction of the positive current collector body; and / or, Satisfying: 0 mm ≤ n1 ≤ 1 mm, where n1 is the difference between the length of the insulating layer along the length direction of the positive current collector body and the length of the adhesive layer along the length direction of the positive current collector body.

8. The battery cell according to any one of claims 1-7, characterized in that, The adhesive layer is a hot melt adhesive layer or a hot melt tape.

9. A battery device, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1 - 8.

10. An energy storage device, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1 - 8 or a plurality of battery devices according to claim 9, where the battery cells or the battery devices are used for storing or providing electrical energy.

11. An electrical device, characterized in that, Comprising: A battery cell according to any one of claims 1 - 8, a battery device according to claim 9, or an energy storage device according to claim 10, where the battery cell or the battery device is used for storing or providing electrical energy.

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