Battery cell, battery device, and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly and at least one insulating part, the electrode assembly is accommodated in the shell, a pole piece of the electrode assembly comprises a functional area coated with an active material layer and an empty foil area not coated with the active material layer, and the functional area is provided with a first end along a first direction. The insulating part comprises a base material and an adhesive layer, the insulating part wraps the first end, the base material comprises a non-sticky area and a sticky area, and the adhesive layer is arranged in the sticky area and connected with the functional area and the sticky area of the base material. According to the battery monomer provided by the invention, the dynamic performance of the battery monomer can be improved, so that the reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, battery-powered vehicles, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, the reliability of battery cells is also an issue that needs to be considered. Therefore, how to improve the reliability of battery cells is an ongoing problem in battery cell technology. Summary of the Utility Model

[0004] The present application provides a battery cell, a battery device, and an electrical device, which are beneficial to improving the reliability of the battery cell.

[0005] The present application is implemented by the following technical solutions:

[0006] In a first aspect, the battery cell provided by the embodiments of the present application includes a housing, an electrode assembly, and at least one insulating member. The electrode assembly is accommodated in the housing. The electrode tab of the electrode assembly includes a functional area coated with an active material layer and a blank foil area not coated with an active material layer. The functional area has a first end along a first direction. The insulating member includes a substrate and an adhesive layer. The insulating member is coated on the first end. The substrate includes a non-adhesive area and an adhesive area. The adhesive layer is disposed in the adhesive area and connects the functional area to the adhesive area of the substrate.

[0007] For the battery cell provided by the embodiments of the present application, by providing an insulating member coated on the first end of the electrode tab, and the insulating member includes a substrate and an adhesive layer, the substrate includes an adhesive area and a non-adhesive area, the adhesive layer is disposed in the adhesive area and connects the functional area to the substrate. In this way, while providing a coating effect for the first end of the electrode tab through the insulating member to reduce the risk of the burr at the first end piercing the separator, the amount of the adhesive layer in the insulating member is reduced through the non-adhesive area of the substrate, so as to reduce the difficulty of metal ions such as lithium ions passing through the insulating member, which is beneficial to improving the kinetic performance of the battery cell, and further beneficial to improving the reliability of the battery cell.

[0008] According to some embodiments of the present application, the area of the adhesive area is S1, the surface area of the insulating member is S, and 10% ≤ S1 / S ≤ 50%.

[0009] In the above scheme, by setting 10%≤S1 / S≤50%, it is beneficial to improve the strength of the bonding connection between the insulating part and the pole piece, while also helping to reduce the difficulty of metal ions such as lithium ions passing through the insulating part, thereby helping to improve the dynamic performance of the battery cell.

[0010] According to some embodiments of the present application, the adhesive area is in a block shape, and a plurality of adhesive areas are arranged in an array.

[0011] In the above scheme, by setting the adhesive area in block shape and arranging multiple adhesive areas in an array, it is beneficial to improve the strength of the bonding connection between the insulating part and the pole piece, while also helping to reduce the difficulty of metal ions such as lithium ions passing through the insulating part, thereby helping to improve the dynamic performance of the battery cell.

[0012] According to some embodiments of the present application, the adhesive area is in a strip shape, and multiple adhesive areas are arranged at intervals.

[0013] In the above solution, by setting the adhesive area in a strip shape and arranging multiple adhesive areas at intervals, it is beneficial to improve the strength of the adhesive connection between the insulating member and the pole piece and to reduce the difficulty of processing the insulating member.

[0014] According to some embodiments of the present application, the distance L between any two adjacent adhesive areas satisfies: 250 μm ≤ L ≤ 650 μm.

[0015] In the above solution, by setting 250μm≤L≤650μm, it is beneficial to improve the strength of the bonding connection between the insulating member and the pole piece, and also to reduce the difficulty of metal ions such as lithium ions passing through the insulating member, thereby improving the dynamic performance of the battery cell.

[0016] According to some embodiments of the present application, the minimum size a of the adhesive area satisfies: 200 μm≤a≤300 μm.

[0017] In the above solution, by setting 200μm≤a≤300μm, it is beneficial to improve the strength of the bonding connection between the insulating member and the pole piece, and also to reduce the difficulty of metal ions such as lithium ions passing through the insulating member, thereby improving the dynamic performance of the battery cell.

[0018] According to some embodiments of the present application, the battery cell includes at least two insulating members, and the at least two insulating members include a first insulating member and a second insulating member. The first insulating member and the second insulating member are bonded to both sides of the functional area along their own thickness direction. A portion of the first insulating member and a portion of the second insulating member are arranged beyond the first end along the first direction and are bonded to each other.

[0019] In the above solution, it is beneficial to improve the covering effect of the insulating member on the first end, and further beneficial to reduce the risk of burrs on the first end piercing the diaphragm and causing internal short circuit of the battery cell.

[0020] According to some embodiments of the present application, the electrode assembly is in a wound shape, the first direction is the winding direction of the electrode assembly, the electrode tab has at least one first end, and the insulating member covers at least one end of the electrode tab along the first direction.

[0021] In the above solution, it is beneficial to make full use of the covering effect of the insulating member on the burrs at the first end, so as to greatly reduce the risk of the burrs piercing the separator.

[0022] According to some embodiments of the present application, one end of the innermost circle of the electrode tab along the first direction is the first end, the functional area includes a straight portion and a bent portion, and the insulating member extends along the first direction from the first end of the innermost circle and covers the bent portion of the innermost circle.

[0023] In the above solution, when the bent portion of the functional area is in a bent state, there is a risk of shedding of the active material layer therein, especially the bent portion of the innermost circle. By providing an insulating member to cover the bent portion of the innermost circle, it is beneficial to reduce the risk that the shed active material layer of the bent portion pierces the separator and causes an internal short circuit in the battery cell.

[0024] According to some embodiments of the present application, the empty foil area is provided at the end of the functional area along the second direction, and the first direction intersects the second direction. The insulating member extends beyond the functional area at least at one end along the second direction.

[0025] In the above solution, the insulating member covers at least one end of the functional area along the second direction, which is beneficial to reducing the risk that the burrs at the end of the functional area along the second direction pierce the separator and cause an internal short circuit in the battery cell.

[0026] According to some embodiments of the present application, the distance h by which the insulating member extends beyond the functional area at least at one end along the second direction satisfies: 2 mm ≤ h ≤ 5 mm.

[0027] In the above solution, by setting 2 mm ≤ h ≤ 5 mm, it is beneficial to improve the covering effect of the insulating member on the end of the functional area along the second direction, so as to reduce the risk of the burrs of the functional area piercing the separator, and it is also beneficial to reduce the space occupied by the insulating member, so as to improve the energy density of the battery cell.

[0028] According to some embodiments of the present application, the thickness e1 of the base material layer ≤ 20 μm; and / or, the thickness e2 of the adhesive layer ≤ 8 μm.

[0029] In the above solution, setting the thickness e1 of the base material layer ≤ 20 μm is beneficial to reducing the space occupied by the base material layer, so as to improve the energy density of the battery cell, while setting e2 ≤ 8 μm is beneficial to reducing the thickness of the adhesive layer, so as to improve the smoothness of the passage of metal ions such as lithium ions through the insulating member.

[0030] According to some embodiments of the present application, the air permeability T of the insulating member satisfies: T ≤ 400 s / 100 cm 3 .

[0031] In the above solution, by setting T ≤ 400 s / 100 cm 3 , it is beneficial to improve the ability of metal ions such as lithium ions to pass through the insulating member, and thus beneficial to improve the kinetic performance of the battery cell.

[0032] In a second aspect, the battery device provided by the embodiments of the present application includes the battery cell provided by any of the above embodiments.

[0033] For the battery device provided by the embodiments of the present application, since it adopts the battery cell provided by any of the above embodiments, it has the same technical effects and will not be elaborated herein.

[0034] In a third aspect, the electrical device provided by the embodiments of the present application includes the battery device provided by the above embodiments, and the battery device is used to provide electrical energy.

[0035] For the electrical device provided by the embodiments of the present application, since it adopts the battery device provided by the embodiments of the present application, it has the same technical effects and will not be elaborated herein.

[0036] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. 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 be obtained based on these drawings without creative efforts.

[0038] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0039] Figure 2 It is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0040] Figure 3 It is a schematic structural diagram of a battery cell assembly in a battery device provided by an embodiment of the present application;

[0041] Figure 4 It is an exploded structural diagram of a battery cell in a battery device provided by an embodiment of the present application;

[0042] Figure 5Schematic diagram of some structures in the battery cell provided by the embodiment of the present application;

[0043] Figure 6 Schematic diagram of the base material of the insulating part in a battery cell provided by the embodiment of the present application;

[0044] Figure 7 Bottom view of the structure of the base material of the insulating part in another battery cell provided by the embodiment of the present application;

[0045] Figure 8 Schematic diagram of the structure of the insulating part in the battery cell provided by the embodiment of the present application;

[0046] Figure 9 Schematic diagram of some structures in the battery cell provided by the embodiment of the present application when the electrode sheet is in the unfolded state;

[0047] Figure 10 Cross-sectional structure schematic diagram of the electrode assembly in the battery cell provided by the embodiment of the present application.

[0048] In the drawings, the drawings are not necessarily drawn to scale.

[0049] Explanation of reference numerals:

[0050] 1 - Vehicle; 1a - Motor; 1b - Controller;

[0051] 10 - Battery device; 11 - Box body; 111 - First sub - box body; 112 - Second sub - box body;

[0052] 20 - Battery cell assembly;

[0053] 30 - Battery cell; 31 - Outer shell; 311 - Shell; 312 - End cover; 32 - Electrode assembly; 321 - Electrode body; 322 - Tab; 33 - Electrode terminal;

[0054] 40 - Electrode sheet; 40a - First end; 41 - Functional area; 41a - Straight part; 41b - Bent part; 42 - Empty foil area;

[0055] 50 - Insulating part; 51 - Base material; 51a - Adhesive area; 51b - Non - adhesive area; 52 - Adhesive layer; 50a - First insulating part; 50b - Second insulating part;

[0056] X - First direction; Y - Second direction. Detailed implementation manners

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0058] 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 description 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 description and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0059] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment when it appears in various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0060] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached to" 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 components. 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.

[0061] The term "and / or" in this application is only 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.

[0062] The "multiple" 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).

[0063] The battery device 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 combined series-parallel manner through a busbar component.

[0064] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; 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 cable ties.

[0065] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0066] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0067] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0068] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, a part of the box body may form at least a part of the floor of the vehicle, or a part of the box body may form at least a part of the cross beam and longitudinal beam of the vehicle.

[0069] In some embodiments, the battery device may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0070] In the embodiments of the present application, the battery cell may be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0071] The battery cell may be, but is not limited to, 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.

[0072] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0073] 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.

[0074] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on either or both of the two opposite surfaces of the positive electrode current collector.

[0075] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0076] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery cell can also be used.

[0077] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0078] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. can be used.

[0079] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material can be a negative electrode active material for a battery cell well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0081] In some embodiments, the separator is an isolation film. The present application has no particular limitation on the type of the isolation film, and any well-known porous structure isolation film with good chemical stability and mechanical stability can be selected.

[0082] 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 ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes or attached to the surfaces of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0084] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0085] In some embodiments, the electrode assembly is a stacked structure.

[0086] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can 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, etc.

[0087] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, the electrolyte, and other substances. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0088] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing body.

[0089] In some embodiments, a pressure relief valve is provided on the housing. The pressure relief valve is used to release the internal pressure of the battery cell.

[0090] 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 multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0091] The electrode assembly of a battery cell includes electrode plates. During the cutting process of the electrode plates, burrs will inevitably be formed at the ends. The burrs at the ends of the electrode plates have the risk of piercing the separator, and then causing the positive and negative electrode plates to contact and short-circuit. Therefore, in related technologies, an insulating member is usually pasted at the end of the electrode plate to cover the burrs at the end of the electrode plate and reduce the risk of the burrs piercing the separator and causing an internal short circuit in the battery cell.

[0092] However, the insulating member usually includes an adhesive layer and a base material. The presence of the adhesive layer will affect the passage of metal ions such as lithium ions, which is not conducive to improving the kinetic performance of the battery cell, and then affects the reliable performance of the battery cell.

[0093] In view of this, the battery cell provided by the embodiment of the present application includes a housing, an electrode assembly, and at least one insulating member. The electrode assembly is accommodated in the housing. The electrode plate of the electrode assembly includes a functional area coated with an active material layer and a blank foil area not coated with an active material layer. The functional area has a first end along a first direction. The insulating member includes a base material and an adhesive layer. The insulating member covers the first end. The base material includes a non-adhesive area and an adhesive area. The adhesive layer is provided in the adhesive area and connects the functional area and the adhesive area of the base material.

[0094] For the battery cell provided by the embodiment of the present application, by arranging the insulating member to cover the first end of the electrode plate, and setting the insulating member to include a base material and an adhesive layer, the base material includes an adhesive area and a non-adhesive area, the adhesive layer is provided in the adhesive area and connects the functional area and the base material. In this way, while providing a covering effect for the first end of the electrode plate through the insulating member to reduce the risk of the burrs at the first end piercing the separator, the amount of the adhesive layer in the insulating member is also reduced through the non-adhesive area of the base material to reduce the difficulty of metal ions such as lithium ions passing through the insulating member, which is beneficial to improving the kinetic performance of the battery cell and then beneficial to improving the reliable performance of the battery cell.

[0095] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices including battery cells, and electrical devices using battery devices.

[0096] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in electrical devices such as vehicles, ships, or aircraft. The power supply system of the electrical device can be composed of the battery device disclosed in the present application.

[0097] The embodiments of the present application provide an electrical device using a battery device as a power source. The electrical device can be but is not limited to mobile phones, tablet computers, laptop computers, electric toys, electric tools, electric bicycles, electric motorcycles, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0098] For the convenience of description, the following embodiments will take a power consumption device in an embodiment of the present application, i.e., a vehicle 1, as an example for illustration.

[0099] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1 provided by an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 can be arranged at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power source of the vehicle 1 for the circuit system of the vehicle 1, such as for the working power consumption requirements during starting, navigation, and operation of the vehicle 1.

[0100] The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, such as for the working power consumption requirements during starting, navigation, and driving of the vehicle 1.

[0101] In some embodiments of the present application, the battery device 10 can not only be used as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0102] Please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic structural diagram of the battery device 10 provided by an embodiment of the present application, Figure 3 and which is an exploded structural diagram of the battery cell 30 provided by an embodiment of the present application. The battery device 10 includes a box body 11 and battery cells 30, and the battery cells 30 are accommodated in the box body 11. Among them, the box body 11 is used to provide an accommodation space for the battery cells 30, and the box body 11 can adopt various structures. In some embodiments, the box body 11 may include a first sub-box body 111 and a second sub-box body 112. The first sub-box body 111 and the second sub-box body 112 are covered with each other, and the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space for accommodating the battery cells 30. The second sub-box body 112 can be a hollow structure with one end open, and the first sub-box body 111 can be a plate-like structure. The first sub-box body 111 covers the open side of the second sub-box body 112 so that the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space; the first sub-box body 111 and the second sub-box body 112 can also both be hollow structures with one side open, and the open side of the first sub-box body 111 covers the open side of the second sub-box body 112.

[0103] In the battery device 10, there may be multiple battery cells 30. The multiple battery cells 30 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 30. The multiple battery cells 30 can be directly connected in series, in parallel, or in a combined series-parallel connection and then the whole formed by the multiple battery cells 30 is accommodated in the box body 11. Of course, in the battery device 10, multiple battery cells 30 can also be first connected in series, in parallel, or in a combined series-parallel connection to form the form of a battery cell assembly 20, and then multiple battery cell assemblies 20 are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box body 11. The battery device 10 can also include other structures. For example, the battery device 10 can also include a busbar component for realizing the electrical connection among the multiple battery cells 30.

[0104] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0105] Please refer to Figure 4 , Figure 4 which is a schematic diagram of the explosion structure of the battery cell 30 provided in the embodiment of the present application. As Figure 4 shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0106] The shell 311 is a component for cooperating with the end cap 312 to form the internal environment of the battery cell 30. Among them, the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte, and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and various sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0107] The end cap 312 refers to a component that covers the opening of the housing 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the housing 311 to fit the housing 311. Optionally, the end cap 312 can be made of a material with certain hardness and strength (such as aluminum alloy). In this way, the end cap 312 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 30 to have higher structural strength and improved reliability. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used for electrical connection with the electrode assembly 32 to output or input the electrical energy of the battery cell 30. The material of the end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 312, and the insulating structure can be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0108] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 can be included in the housing 311. The electrode assembly 32 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and usually, a separator is provided between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the electrode tabs 322. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 321 together or at both ends of the electrode body 321 respectively. During the charge and discharge process of the battery cell 30, the positive active substance and the negative active substance react with the electrolyte solution, and the electrode tab 322 is connected to the electrode terminal 33 to form a current loop.

[0109] In a first aspect, as Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, the battery cell 30 provided by the embodiments of the present application includes a housing 31, an electrode assembly 32, and at least one insulating member 50. The electrode assembly 32 is accommodated in the housing 31. The electrode sheet 40 of the electrode assembly 32 includes a functional area 41 coated with an active substance layer and a blank foil area 42 not coated with an active substance layer. The functional area 41 has a first end 40a along the first direction X. The insulating member 50 includes a base material 51 and an adhesive layer 52. The insulating member 50 covers the first end 40a. The base material 51 includes a non-adhesive area 51b and an adhesive area 51a. The adhesive layer 52 is provided in the adhesive area 51a of the base material 51 and connects the functional area 41 and the adhesive area 51a of the base material 51.

[0110] The electrode assembly 32 may include a positive electrode sheet and a negative electrode sheet. The electrode sheet 40 may be a positive electrode sheet, or the electrode sheet 40 may be a negative electrode sheet, or the electrode sheet 40 may be both a positive electrode sheet and a negative electrode sheet. An insulating member 50 may be provided at the end of the positive electrode sheet, or an insulating member 50 may be provided at the end of the negative electrode sheet, or insulating members 50 are provided at the ends of both the positive electrode sheet and the negative electrode sheet.

[0111] Optionally, the electrode assembly 32 may be in a wound shape, or the electrode assembly 32 may be in a stacked sheet shape. The battery cell 30 may be in a prismatic shape, or the battery cell 30 may be in a cylindrical shape. Correspondingly, the electrode assembly 32 may be wound into a prismatic shape or a cylindrical shape.

[0112] The electrode sheet 40 includes a functional area 41 and a blank foil area 42. The functional area 41 may be the part of the electrode sheet 40 where metal ions such as lithium ions can be repeatedly extracted and inserted, while the blank foil area 42 may be the part of the electrode sheet 40 for current passage, such as the electrode tab 322, etc.

[0113] If the functional area 41 has a first end 40a along the first direction X, then optionally, the functional area 41 may have a first end 40a at either end along the first direction X, or the functional area 41 may have a first end 40a at each of the two ends along the first direction X.

[0114] The first direction X may be the leading-out direction of the blank foil area 42 relative to the functional area 41, that is, the leading-out direction of the electrode tab 322 of the electrode assembly 32, or the first direction X may also be a direction intersecting with the leading-out direction of the electrode tab 322. In an embodiment where the electrode assembly 32 is in a wound shape, the first direction X may be the winding direction of the electrode sheet 40.

[0115] One or two or more insulating members 50 may be provided at one first end 40a. Since one electrode sheet 40 may have one or more insulating members 50, the battery cell 30 may have one or more insulating members 50, and the structural forms of different insulating members 50 may not be the same. Exemplarily, two insulating members 50 may be respectively attached to both sides of the electrode sheet 40 in the thickness direction, or one insulating member 50 may have its two ends respectively attached to both sides of the electrode sheet 40 in the thickness direction.

[0116] When the insulating member 50 covers the first end 40a, the insulating member 50 has a covering effect on the burrs at the first end 40a. Thus, it is beneficial to reduce the risk of the burrs piercing the separator and causing an internal short circuit in the battery cell 30.

[0117] The base material 51 includes a non-adhesive area 51b and an adhesive area 51a. Optionally, the adhesive area 51a may be in a block shape such as a dot shape, a square shape, etc. Of course, the adhesive area 51a may also be in a strip shape.

[0118] The substrate may include one or more adhesive regions 51a. Similarly, the substrate may include one or more non - adhesive regions 51b, which can be selected according to actual needs. The multiple adhesive regions 51a can be arranged in an array. The adhesive layer 52 is disposed on the adhesive region 51a, and there is no adhesive layer 52 on the non - adhesive region 51b. Then, the adhesive layer 52 does not cover the entire area of the substrate 51, but is arranged in an array. The arrangement modes of the adhesive region 51a and the adhesive layer 52 can be set according to actual needs.

[0119] In this way, during the operation of the battery cell 30, since there is no adhesive layer 52 on the non - adhesive region 51b, metal ions such as lithium ions can easily pass through the substrate 51 of the non - adhesive region 51b and penetrate the insulating member 50, which is beneficial to improving the kinetic performance of the battery cell 30.

[0120] In the battery cell 30 provided by the embodiment of the present application, the insulating member 50 is provided to cover the first end 40a of the electrode sheet 40, and the insulating member 50 includes a substrate 51 and an adhesive layer 52. The substrate 51 includes an adhesive region 51a and a non - adhesive region 51b. The adhesive layer 52 is disposed on the adhesive region 51a and connects the functional region 41 and the substrate 51. In this way, while the insulating member 50 provides a covering effect for the first end 40a of the electrode sheet 40 to reduce the risk of the burr at the first end 40a piercing the separator, the non - adhesive region 51b of the substrate 51 also reduces the amount of the adhesive layer 52 in the insulating member 50, so as to reduce the difficulty of metal ions such as lithium ions passing through the insulating member 50, which is beneficial to improving the kinetic performance of the battery cell 30, and further beneficial to improving the reliable performance of the battery cell 30.

[0121] In some embodiments, the area of the adhesive region 51a is S1, and the surface area of the insulating member 50 is S, and 10% ≤ S1 / S ≤ 50%.

[0122] Optionally, S1 / S can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, etc.

[0123] It can be understood that to a certain extent, the larger the value of S1 / S, the more beneficial it is to improve the bonding strength between the insulating member 50 and the electrode sheet 40. And to a certain extent, the smaller the value of S1 / S, the more convenient it is for metal ions such as lithium ions to pass through the insulating member 50 to improve the kinetic performance of the battery cell 30.

[0124] Therefore, after systematic analysis and long - term practice, the inventor found that by setting 10% ≤ S1 / S ≤ 50%, it is beneficial to improve the bonding strength between the insulating member 50 and the electrode sheet 40, and at the same time, it is beneficial to reduce the difficulty of metal ions such as lithium ions passing through the insulating member 50, and further beneficial to improving the kinetic performance of the battery cell 30.

[0125] In some embodiments, such asFigure 6 As shown, the adhesive areas 51a are in block shapes, and multiple adhesive areas 51a are arranged in an array.

[0126] The adhesive areas 51a are in block shapes. Optionally, the adhesive areas 51a can be in rectangular block shapes, or the adhesive areas 51a can be in circular or other shaped blocks. Multiple adhesive areas 51a can be distributed in a rectangular array or can be distributed in a circular array. Correspondingly, the adhesive layer 52 on the base material 51 is arranged in the same array as the adhesive areas 51a.

[0127] By arranging the adhesive areas 51a in an array, metal ions such as lithium ions can pass through the base material 51 through more non - adhesive areas 51b, and the insulating member 50 and the electrode tab 40 have a relatively high connection strength.

[0128] Therefore, by arranging the adhesive areas 51a in block shapes and multiple adhesive areas 51a in an array, it is beneficial to improve the bonding connection strength between the insulating member 50 and the electrode tab 40, and at the same time, it is beneficial to reduce the difficulty of metal ions such as lithium ions passing through the insulating member 50, thereby being beneficial to improving the kinetic performance of the battery cell 30.

[0129] In some embodiments, as Figure 7 shown, the adhesive areas 51a are in strip shapes, and multiple adhesive areas 51a are arranged at intervals.

[0130] The adhesive areas 51a are in strip shapes. Optionally, the adhesive areas 51a can extend in a strip shape along the first direction X, or the adhesive areas 51a can extend in a direction intersecting the first direction X.

[0131] By arranging the adhesive areas 51a in strip shapes and multiple adhesive areas 51a at intervals, it is beneficial to improve the bonding connection strength between the insulating member 50 and the electrode tab 40 and is beneficial to reducing the processing difficulty of the insulating member 50.

[0132] In some embodiments, as Figure 6 and Figure 7 shown, the distance L between any two adjacent adhesive areas 51a satisfies: 250μm ≤ L ≤ 650μm.

[0133] Optionally, L can be 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, 600μm or 650μm, etc.

[0134] It can be understood that the larger L is, the larger the distance between the adhesive areas 51a is, and it is more convenient for metal ions such as lithium ions to pass through the base material 51. And the smaller L is, the denser the arrangement of the adhesive areas 51a is, and it is more beneficial to improve the connection strength between the insulating member 50 and the electrode tab 40.

[0135] Therefore, through systematic analysis and long-term practice, the inventors found that by setting 250 μm ≤ L ≤ 650 μm, it is beneficial to improve the bonding strength between the insulating member 50 and the electrode tab 40, and at the same time, it is also beneficial to reduce the difficulty of metal ions such as lithium ions passing through the insulating member 50, thereby facilitating the improvement of the kinetic performance of the battery cell 30.

[0136] In some embodiments, as Figure 6 and Figure 7 shown, the minimum size a of the adhesive zone 51a satisfies: 200 μm ≤ a ≤ 300 μm.

[0137] Optionally, a can be 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm, etc.

[0138] It can be understood that the larger a is to a certain extent, the more beneficial it is to improve the bonding reliability between the insulating member 50 and the electrode tab 40, and the smaller a is to a certain extent, the more convenient it is for metal ions such as lithium ions to pass through the insulating member 50.

[0139] Therefore, through systematic analysis and long-term practice, the inventors found that by setting 200 μm ≤ a ≤ 300 μm, it is beneficial to improve the bonding strength between the insulating member 50 and the electrode tab 40, and at the same time, it is also beneficial to reduce the difficulty of metal ions such as lithium ions passing through the insulating member 50, thereby facilitating the improvement of the kinetic performance of the battery cell 30.

[0140] In some embodiments, as Figure 9 shown, the battery cell 30 includes at least two insulating members 50. The at least two insulating members 50 include a first insulating member 50a and a second insulating member 50b. The first insulating member 50a and the second insulating member 50b are bonded to both sides of the functional region 41 along its thickness direction. A part of the first insulating member 50a and a part of the second insulating member 50b extend beyond the first end 40a along the first direction X and are bonded to each other.

[0141] In this way, by bonding the first insulating member 50a and the second insulating member 50b to both sides of the functional region 41 along the thickness direction respectively, it is beneficial to improve the covering effect of the insulating member 50 on the first end 40a, and further beneficial to reduce the risk of internal short circuit of the battery cell 30 caused by the burrs at the first end 40a piercing the separator.

[0142] In some embodiments, as Figure 10 shown, the electrode assembly 32 is in a wound shape. The first direction X is the winding direction of the electrode assembly 32. The electrode tab 40 has at least one first end 40a, and the insulating member 50 covers at least one end of the electrode tab 40 along the first direction X.

[0143] Optionally, either end of the pole piece 40 along the winding direction can be set as the first end 40a, or both ends of the pole piece 40 along the winding direction can be set as the first end 40a. In other words, an insulating member 50 can be provided at either end of the pole piece 40 along the winding direction, or insulating members 50 can be provided at both ends of the pole piece 40 along the winding direction.

[0144] If the first direction X is the winding direction of the electrode assembly 32, then the first end 40a of the pole piece 40 is the cut end of the pole piece 40, and burrs are more likely to be generated. By providing the insulating member 50 at the first end 40a of the pole piece 40 along the winding direction, it is beneficial to make full use of the covering effect of the insulating member 50 on the burrs at the first end 40a to greatly reduce the risk of the burrs piercing the separator.

[0145] In some embodiments, as Figure 10 shown, one end of the innermost circle of the pole piece 40 along the first direction X is the first end 40a. The functional area 41 includes a straight portion 41a and a bent portion 41b. The insulating member 50 extends along the first direction X from the first end 40a of the innermost circle and covers the bent portion 41b of the innermost circle.

[0146] The functional area 41 includes a straight portion 41a and a bent portion 41b. The straight portion 41a is straight, and the bent portion 41b is bent. In this way, after the electrode assembly 32 is wound and then through processes such as shaping, it finally takes a prismatic shape.

[0147] When the bent portion 41b of the functional area 41 is in a bent state, there is a risk that the active material layer therein will fall off, especially the bent portion 41b of the innermost circle. By providing the insulating member 50 to cover the bent portion 41b of the innermost circle, it is beneficial to reduce the risk that the active material layer falling off from the bent portion 41b pierces the separator and causes an internal short circuit in the battery cell 30.

[0148] In some embodiments, as Figure 5 shown, the empty foil area 42 is provided at the end of the functional area 41 along the second direction Y, and the first direction X intersects the second direction Y. The insulating member 50 extends beyond the functional area 41 at at least one end along the second direction Y.

[0149] Optionally, one end of the insulating member 50 along the second direction Y can extend beyond the functional area 41, or both ends of the insulating member 50 along the second direction Y can extend beyond the functional area 41.

[0150] In this way, the insulating member 50 covers at least one end of the functional area 41 along the second direction Y, which is beneficial to reducing the risk that the burrs at the end of the functional area 41 along the second direction Y pierce the separator and cause an internal short circuit in the battery cell 30.

[0151] In some embodiments, as Figure 5As shown, the distance h by which the insulating member 50 extends beyond the functional area 41 at at least one end along the second direction Y satisfies: 2 mm ≤ h ≤ 5 mm.

[0152] Optionally, h can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, etc.

[0153] After systematic analysis and long-term practice, the inventors found that by setting 2 mm ≤ h ≤ 5 mm, it is beneficial to improve the covering effect of the insulating member 50 on the end of the functional area 41 along the second direction Y, so as to reduce the risk of burrs in the functional area 41 piercing the diaphragm, and it is also beneficial to reduce the space occupied by the insulating member 50, so as to improve the energy density of the battery cell 30.

[0154] In some embodiments, as Figure 8 shown, the thickness e1 of the base material layer 51 ≤ 20 μm; and / or, the thickness e2 of the adhesive layer 52 ≤ 8 μm.

[0155] Setting the thickness e1 of the base material layer 51 ≤ 20 μm is beneficial to reducing the space occupied by the base material layer 51, so as to improve the energy density of the battery cell 30, and setting e2 ≤ 8 μm is beneficial to reducing the thickness of the adhesive layer 52, so as to improve the smoothness of metal ions such as lithium ions passing through the insulating member 50.

[0156] In some embodiments, the air permeability T of the insulating member 50 satisfies: T ≤ 400 s / 100 cm 3 .

[0157] After systematic analysis and long-term practice, the inventors found that by setting T ≤ 400 s / 100 cm 3 , it is beneficial to improve the ability of metal ions such as lithium ions to pass through the insulating member 50, and thus beneficial to improving the kinetic performance of the battery cell 30.

[0158] In a second aspect, the battery device 10 provided by the embodiments of the present application includes the battery cell 30 provided by any one of the above embodiments.

[0159] Since the battery device 10 provided by the embodiments of the present application adopts the battery cell 30 provided by any one of the above embodiments, it has the same technical effects, which will not be elaborated here.

[0160] In a third aspect, the electrical device provided by the embodiments of the present application includes the battery device 10 provided by the above embodiments, and the battery device 10 is used to provide electrical energy.

[0161] Since the electrical device provided by the embodiments of the present application adopts the battery device 10 provided by the embodiments of the present application, it has the same technical effects, which will not be elaborated here.

[0162] In some embodiments, asFigures 4 to 10 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and at least one insulating member 50. The electrode assembly 32 is accommodated in the housing 31. The electrode tab 40 of the electrode assembly 32 includes a functional area 41 coated with an active material layer and a blank foil area 42 not coated with an active material layer. The functional area 41 has a first end 40a along the first direction X. The insulating member 50 includes a base material 51 and an adhesive layer 52. The insulating member 50 is wrapped around the first end 40a. The base material 51 includes a non-adhesive area 51b and an adhesive area 51a. The adhesive layer 52 is disposed in the adhesive area 51a and connects the functional area 41 and the base material 51. The area of the adhesive area 51a is S1, and the surface area of the insulating member 50 is S, where 10% ≤ S1 / S ≤ 50%. The adhesive area 51a is in a block shape, and multiple adhesive areas 51a are arranged in an array. The spacing L between any two adjacent adhesive areas 51a satisfies: 250 μm ≤ L ≤ 650 μm, and the minimum dimension a of the adhesive area 51a satisfies: 200 μm ≤ a ≤ 300 μm. The battery cell 30 includes at least two insulating members 50. The at least two insulating members 50 include a first insulating member 50a and a second insulating member 50b. The first insulating member 50a and the second insulating member 50b are bonded to both sides of the functional area 41 along its thickness direction. A part of the first insulating member 50a and a part of the second insulating member 50b extend beyond the first end 40a along the first direction X and are bonded to each other. The electrode assembly 32 is in a wound shape. The first direction X is the winding direction of the electrode assembly 32. The electrode tab 40 has at least one first end 40a. The insulating member 50 is wrapped around at least one end of the electrode tab 40 along the first direction X. The innermost end of the electrode tab 40 along the first direction X is the first end 40a. The functional area 41 includes a straight portion 41a and a bent portion 41b. The insulating member 50 extends along the first direction X from the innermost first end 40a and covers the innermost bent portion 41b. The blank foil area 42 is disposed at the end of the functional area 41 along the second direction Y. The first direction X intersects the second direction Y. At least one end of the insulating member 50 extends beyond the functional area 41 along the second direction Y. The distance h by which at least one end of the insulating member 50 extends beyond the functional area 41 along the second direction Y satisfies: 2 mm ≤ h ≤ 5 mm. The thickness e1 of the base material 51 layer ≤ 20 μm, and the thickness e2 of the adhesive layer 52 ≤ 8 μm. The air permeability T of the insulating member 50 satisfies: T ≤ 400 s / 100 cm 3 .

[0163] The battery cell 30 provided by the embodiment of the present application is configured such that an insulating member 50 is provided to cover the first end 40a of the electrode sheet 40, and the insulating member 50 includes a base material 51 and an adhesive layer 52. The base material 51 includes a sticky region 51a and a non-sticky region 51b. The adhesive layer 52 is disposed in the sticky region 51a and connects the functional region 41 and the base material 51. In this way, while the insulating member 50 provides a covering function for the first end 40a of the electrode sheet 40 to reduce the risk of the burrs at the first end 40a piercing the separator, the amount of the adhesive layer 52 in the insulating member 50 is reduced by the non-sticky region 51b of the base material 51, so as to reduce the difficulty for metal ions such as lithium ions to pass through the insulating member 50, which is beneficial to improving the kinetic performance of the battery cell 30 and further beneficial to improving the reliable performance of the battery cell 30.

[0164] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing; An electrode assembly accommodated in the housing, the electrode tab of the electrode assembly including a functional area coated with an active material layer and a blank foil area not coated with an active material layer, the functional area having a first end along a first direction; At least one insulating member, the insulating member including a base material and an adhesive layer, the insulating member covering the first end, the base material including a non-adhesive area and an adhesive area, the adhesive layer being provided in the adhesive area and connecting the functional area and the base material.

2. The battery cell according to claim 1, wherein The area of the adhesive area is S1, the surface area of the insulating member is S, and 10% ≤ S1 / S ≤ 50%.

3. The battery cell according to claim 1, characterized in that, The adhesive area is in a block shape, and a plurality of the adhesive areas are arranged in an array.

4. The battery cell according to claim 1, wherein The adhesive area is in a strip shape, and a plurality of the adhesive areas are spaced apart.

5. The battery cell according to claim 1, characterized in that, The distance L between any two adjacent adhesive areas satisfies: 250 μm ≤ L ≤ 650 μm.

6. The battery cell according to claim 1, characterized in that, The minimum dimension a of the adhesive area satisfies: 200 μm ≤ a ≤ 300 μm.

7. The battery cell according to claim 1, characterized in that, The battery cell includes at least two of the insulating members, the at least two insulating members including a first insulating member and a second insulating member, the first insulating member and the second insulating member being bonded to both sides of the functional area along its thickness direction, a part of the first insulating member and a part of the second insulating member extending beyond the first end along the first direction and being bonded to each other.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The electrode assembly is in a wound shape, the first direction being the winding direction of the electrode assembly, the electrode tab having at least one of the first ends, and the insulating member covering at least one end of the electrode tab along the first direction.

9. The battery cell according to claim 8, characterized in that, The end of the innermost circle of the electrode tab along the first direction is the first end, the functional area including a straight portion and a bent portion, and the insulating member extending from the first end of the innermost circle along the first direction and covering the bent portion of the innermost circle.

10. The battery cell according to any one of claims 1 to 7, characterized in that, The blank foil area is provided at an end of the functional area along a second direction, the first direction intersecting the second direction; and at least one end of the insulating member extends beyond the functional area along the second direction.

11. The battery cell according to claim 10, wherein, The distance h by which at least one end of the insulating member extends beyond the functional area along the second direction satisfies: 2 mm ≤ h ≤ 5 mm.

12. The battery cell according to any one of claims 1 to 7, characterized in that, The thickness e1 of the base material layer ≤ 20 μm; and / or, the thickness e2 of the adhesive layer ≤ 8 μm.

13. The battery cell according to any one of claims 1 to 7, characterized in that, The air permeability T of the insulating part satisfies: T ≤ 400 s / 100 cm 3 .

14. A battery device, characterized in that, A battery cell including the battery cell according to any one of claims 1 to 13.

15. An electrical device, characterized in that, A battery device including the battery device according to claim 14, the battery device being used to provide electrical energy.

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