Battery cell, battery and electric device

Abstract

The utility model provides a battery monomer, a battery 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 part along a first direction. The insulating part comprises an adhesive area and a non-adhesive area connected to the adhesive area, at least part of the adhesive area is adhered to the functional area, and at least part of the non-adhesive area protrudes out of the first end portion in the first direction. According to the battery monomer provided by the invention, the risk of wrinkling of the insulating part can be reduced, and the smoothness of discharging bubbles between the insulating part and the functional area can be improved, so that the structural strength of the insulating part can be improved, the supporting strength of the insulating part to the electrode assembly can be improved, and the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, in addition to improving the performance of battery cells, how to improve the reliability of battery cells is also an issue that cannot be ignored. Therefore, how to improve the reliability of battery cells is a technical issue that needs to be continuously improved in battery technology. Utility Model Content

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

[0005] In a first aspect, a battery cell provided by an embodiment of the present application includes a housing, an electrode assembly, and at least one insulating member, wherein the electrode assembly is contained in the housing, and the electrode sheet of the electrode assembly includes a functional area coated with an active material layer and an empty foil area not coated with the active material layer, wherein the functional area has a first end along a first direction. The insulating member includes a sticky area and a non-sticky area connected to the sticky area, wherein at least a portion of the sticky area is bonded to the functional area, and at least a portion of the non-sticky area protrudes from the first end along the first direction.

[0006] The battery cell provided in the embodiment of the present application is helpful to reduce the risk of damaging the electrode plate or diaphragm of the electrode assembly due to burrs or the like on the insulating part, by setting the insulating part to have a non-adhesive area, and at least a part of the non-adhesive area protrudes from the first end along the first direction. In addition, in the process of bonding the insulating part to the first end of the functional area, it is helpful to reduce the risk of unnecessary bonding connection between the insulating part itself or the insulating part and other structures, and it is helpful to reduce the risk of wrinkles on the insulating part, and it is helpful to improve the smoothness of bubble discharge between the insulating part and the functional area. In this way, it is helpful to improve the structural strength of the insulating part, and it is helpful to improve the supporting strength of the insulating part to the electrode assembly, and further to improve the reliability of the battery cell.

[0007] According to some embodiments of the present application, at least one insulating member includes two insulating members, the two insulating members include a first insulating member and a second insulating member, at least a portion of the adhesive area of ​​the first insulating member and at least a portion of the adhesive area of ​​the second insulating member are respectively bonded to both sides of the functional area along their own thickness direction, and at least a portion of the non-adhesive area of ​​the first insulating member and at least a portion of the non-adhesive area of ​​the second insulating member protrude from the first end along the first direction.

[0008] In the above scheme, the first insulating member and the second insulating member are respectively bonded to the two sides of the functional area along the thickness direction, which is conducive to improving the coating effect of the insulating member on the first end, and is conducive to reducing the risk of burrs on the first end damaging the electrode assembly, and the insulating member can provide a strong support for the electrode assembly, reducing the risk of collapse of the electrode assembly. The bubbles generated during the bonding process of the insulating member and the functional area can be discharged through the gap between the non-adhesive area of ​​the first insulating member and the second insulating member, which is conducive to reducing the risk of wrinkles on the insulating member and reducing the risk of lithium precipitation.

[0009] According to some embodiments of the present application, the adhesive area includes a first portion and a second portion, the second portion is located between the first portion and the non-adhesive area, and the second portion protrudes from the first end portion along the first direction. The first portion of the first insulating member and the first portion of the second insulating member are respectively bonded to both sides of the functional area along the thickness direction, and the second portion of the first insulating member and the second portion of the second insulating member are bonded to each other.

[0010] In the above scheme, the first insulating member and the second insulating member can better cover the first end, which is conducive to further reducing the risk of dust or burrs on the first end damaging the electrode assembly. The second part beyond the first end is bonded and connected, which is conducive to increasing the structural strength of the insulating member, thereby increasing the supporting force of the insulating member on the electrode assembly and reducing the risk of collapse of the electrode assembly. In addition, the part of the functional area close to the first end is bonded and connected to the first insulating member and the second insulating member on both sides along the thickness direction, which is conducive to further reducing the risk of lithium deposition in the functional area.

[0011] According to some embodiments of the present application, the non-adhesive region of the first insulating member is in contact with the non-adhesive region of the second insulating member.

[0012] In the above scheme, the non-sticky areas that are in contact with each other have higher structural strength, which can provide greater support for the electrode assembly, and is conducive to further reducing the risk of collapse of the electrode assembly.

[0013] According to some embodiments of the present application, a dimension a of the first portion along the first direction satisfies: 1 mm ≤ a ≤ 7 mm.

[0014] In the above scheme, setting 1mm≤a≤7mm is beneficial to reducing the risk of bubbles generated between the insulating part and the functional area, and is beneficial to reducing the process difficulty of bonding the insulating part and the functional area. It is also beneficial to improve the covering effect of the insulating part on the first end of the electrode piece, and is beneficial to reducing the risk of burrs or dust at the first end damaging the electrode assembly.

[0015] According to some embodiments of the present application, a dimension b of the non-adhesive area along the first direction satisfies: 3 mm ≤ b ≤ 15 mm.

[0016] In the above scheme, setting 3mm≤b≤15mm is beneficial to improving the supporting effect of the non-adhesive area on the electrode assembly, while also helping to reduce the volume occupied by the insulating member, thereby helping to improve the energy density of the battery cell.

[0017] According to some embodiments of the present application, the functional area has two first end portions along the first direction, and at least one insulating member is correspondingly disposed at each first end portion.

[0018] In the above solution, at least one insulating member is provided at each of the two first ends of the functional area along the first direction, which is beneficial to further reduce the risk of burrs or dust at the first ends causing certain damage to the electrode assembly.

[0019] According to some embodiments of the present application, the electrode assembly includes at least one positive electrode sheet and at least one negative electrode sheet, the electrode sheet is a positive electrode sheet, and / or the electrode sheet is a negative electrode sheet.

[0020] In the above scheme, the electrode sheet is set to be at least one of the positive electrode sheet and the negative electrode sheet, and an insulating member can be used to provide a certain protection for at least one of the positive electrode sheet and the negative electrode sheet, thereby reducing the risk of dust or burrs generated at the first end of the positive electrode sheet or the negative electrode sheet entering the interior of the electrode assembly and damaging the positive electrode sheet or the negative electrode sheet.

[0021] According to some embodiments of the present application, the functional area has two second ends in the second direction, at least one of the second ends is connected to the empty foil area, and the second direction intersects with the first direction.

[0022] In the above scheme, the insulating member is arranged at the end of the pole piece along the winding direction, so that the insulating member can provide a better covering effect for the first end, which is beneficial to reduce the risk of burrs or dust on the first end damaging the electrode assembly.

[0023] According to some embodiments of the present application, along the second direction, the insulating member extends beyond at least one second end; and / or, along the second direction, a size of the insulating member is greater than or equal to a size of the functional area.

[0024] In the above scheme, the edge member covers at least one end of the first end along the second direction, and the insulating member covers at least one end of the functional area close to the first end along the second direction, which is beneficial to further reduce the risk of dust or burrs at the first end piercing the electrode assembly, and further helps to reduce the risk of lithium deposition in the functional area.

[0025] According to some embodiments of the present application, the empty foil area is disposed beyond the insulating member along the second direction.

[0026] In the above scheme, the empty foil area is arranged beyond the insulating part along the second direction, which is beneficial to reduce the adverse effect of the insulating part on the tab shaping process during the tab shaping process, facilitates the smooth progress of the tab shaping process, and is beneficial to improving the current carrying capacity of the tab formed after shaping.

[0027] According to some embodiments of the present application, a dimension c of the insulating member extending beyond the functional area along the second direction satisfies 0<c≤30 mm.

[0028] In the above scheme, setting 0<c≤30mm is beneficial to reducing the risk of dust or burrs at the first end portion piercing the electrode assembly, and is beneficial to reducing the risk of lithium deposition in the functional area close to the first end portion, and is also beneficial to improving the current carrying capacity of the shaped pole ear 332.

[0029] According to some embodiments of the present application, 0<c≤5mm.

[0030] In the above scheme, setting 0<c≤5mm is beneficial to reduce the risk of dust or burrs at the first end to pierce the electrode assembly, further helping to reduce the risk of lithium deposition in the functional area close to the first end, and further helping to improve the current carrying capacity of the shaped electrode ear 332.

[0031] According to some embodiments of the present application, the empty foil area is connected to an end of the functional area along the first direction.

[0032] In the above solution, the hollow foil area is provided to be connected to the end of the functional area along the first direction, which is beneficial to improving the supporting force of the insulating member on the electrode assembly.

[0033] According to some embodiments of the present application, the empty foil area includes a plurality of spaced-apart tabs, the first end includes a tab lead-out portion and a non-tab lead-out portion, the tab is only led out by the tab lead-out portion, and the insulating member covers at least a portion of the non-tab lead-out portion.

[0034] In the above solution, by providing the insulating piece to cover at least part of the non-tab lead-out portion, it is helpful to reduce the risk of burrs or dust on the non-tab lead-out portion piercing the electrode assembly. And the insulating piece covers the non-tab lead-out end, which is helpful to reduce the risk of internal short circuit of the battery cell caused by the tab and the functional area overlapping.

[0035] According to some embodiments of the present application, the functional area has two third ends in a third direction, and the third direction intersects with the first direction. Along the third direction, the insulating member exceeds at least one third end; and / or, along the third direction, the size of the insulating member is greater than or equal to the size of the functional area.

[0036] In the above scheme, the insulating part can cover at least one end of the first end along the third direction, which is beneficial to further improve the covering effect of the insulating part on the first end, further help to reduce the risk of burrs or dust on the first end damaging the electrode assembly, and help to improve the supporting force of the insulating part on the electrode assembly.

[0037] According to some embodiments of the present application, the functional area is in a winding shape, the first direction is the winding direction, the first end is the starting end, and the starting end is located at the end of the innermost circle of the functional area along the winding direction.

[0038] In the above scheme, the insulating part is arranged at the starting end of the pole piece, that is, the insulating part is arranged at the end of the innermost circle of the pole piece. The insulating part can reduce the risk of dust or burrs at the starting end piercing the electrode assembly while providing good support for the electrode assembly, reducing the risk of collapse or deformation of the electrode assembly.

[0039] According to some embodiments of the present application, the first end is a tail end, and the tail end is located at the end of the outermost circle of the functional area along the winding direction.

[0040] In the above scheme, the insulating member is arranged at the tail end of the pole piece, which is beneficial to reduce the risk of dust or burrs at the tail end of the outermost circle of the pole piece causing certain damage to the electrode assembly, and is beneficial to improving the reliability of the battery cell.

[0041] According to some embodiments of the present application, a portion of the non-adhesive region that exceeds the starting end along the winding direction is wound inside the pole piece.

[0042] In the above scheme, the wound non-sticky area has a higher structural strength, which is beneficial to further improve the supporting effect of the non-sticky area on the electrode assembly, and further beneficial to reduce the risk of internal collapse or deformation of the electrode assembly.

[0043] According to some embodiments of the present application, the portion of the non-adhesive area beyond the starting end is wound in n turns, where 1≤n≤10.

[0044] In the above scheme, setting 1≤n≤10 is beneficial to improving the supporting strength of the non-sticky area to the electrode assembly while reducing the space inside the battery cell occupied by the non-sticky area, thereby facilitating improving the energy density of the battery cell.

[0045] According to some embodiments of the present application, the electrode assembly is in a wound shape, and the empty foil area is connected to the end of the functional area along a first direction, and the first direction is perpendicular to the winding direction of the electrode assembly.

[0046] In the above solution, the insulating member can be arranged in a winding shape along with the first end portion, which is beneficial to improving the supporting force of the insulating member on the electrode assembly and reducing the risk of internal collapse of the electrode assembly.

[0047] According to some embodiments of the present application, the functional area is in a laminated shape, and the hollow foil area is connected to the end of the functional area along the first direction.

[0048] In the above scheme, the insulating parts can also be stacked, which is beneficial to improve the supporting force of the insulating parts on the electrode assembly, and further helps to improve the structural stability of the electrode assembly.

[0049] According to some embodiments of the present application, the functional area is in a laminated shape, has two second ends in the second direction, at least one second end is connected to the empty foil area, and the second direction, the first direction and the thickness direction of the functional area are perpendicular to each other.

[0050] In the above scheme, the insulating member can also be stacked, which is beneficial to reduce the risk of puncturing the diaphragm by burrs at the first end of the functional area, and is beneficial to improve the supporting force of the insulating member on the electrode assembly.

[0051] In a second aspect, the battery provided in the embodiments of the present application includes the battery cell provided in any of the above embodiments.

[0052] The battery provided in the embodiment of the present application has the same technical effect as the battery cell provided in any of the above embodiments.

[0053] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery provided by any of the above embodiments, and the battery is used to provide electrical energy.

[0054] The electrical device provided in the embodiment of the present application has the same technical effect as the battery cell or battery provided in any of the above embodiments, which will not be described in detail here.

[0055] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0057] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0058] Figure 2 An exploded schematic diagram of a battery provided in an embodiment of the present application;

[0059] Figure 3 A schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application;

[0060] Figure 4 A schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application;

[0061] Figure 5 A schematic diagram of the structure of the cooperation between the pole piece and the insulating member in the battery cell provided in the embodiment of the present application;

[0062] Figure 6 A schematic cross-sectional structure diagram of a pole piece and an insulating member in a battery cell provided in an embodiment of the present application;

[0063] Figure 7 A schematic cross-sectional structure diagram of a pole piece and an insulating member in another battery cell provided in an embodiment of the present application;

[0064] Figure 8 A schematic cross-sectional structure diagram of a pole piece and an insulating member in another battery cell provided in an embodiment of the present application;

[0065] Fig. 9 A schematic diagram of the structure of the cooperation between the pole piece and the insulating member in another battery cell provided in an embodiment of the present application;

[0066] Fig.10 A schematic diagram of the structure of the cooperation between the pole piece and the insulating member in another battery cell provided in an embodiment of the present application;

[0067] Fig.11 A schematic diagram of the structure of the cooperation between the pole piece and the insulating member in another battery cell provided in an embodiment of the present application;

[0068] Fig.12 A schematic diagram of the structure of the cooperation between the pole piece and the insulating member in another battery cell provided in an embodiment of the present application;

[0069] Fig.13 A schematic cross-sectional view of an electrode assembly in a battery cell provided in an embodiment of the present application;

[0070] Fig.14 A schematic cross-sectional view of an electrode assembly in another battery cell provided in an embodiment of the present application;

[0071] Fig.15A schematic cross-sectional view of an electrode assembly in another battery cell provided in an embodiment of the present application;

[0072] Fig.16 A schematic cross-sectional structure diagram of an electrode assembly in another battery cell provided in an embodiment of the present application.

[0073] In the drawings, the drawings are not drawn to scale.

[0074] Description of reference numerals:

[0075] 1- Vehicle;

[0076] 10-battery; 111-first sub-box; 112-second sub-box; 11-box; 1a-motor; 1b-controller;

[0077] 20-battery module;

[0078] 30-battery cell; 31-housing; 311-housing; 312-end cover; 32-electrode assembly; 321-positive electrode sheet; 322-negative electrode sheet; 33-electrode sheet; 331-functional area; 331a-first end; 3311a-ear lead-out portion; 3312a-non-ear lead-out portion; 331b-second end; 331c-third end; 332-empty foil area; 3321-ear; 34-insulating member; 341-first insulating member; 342-second insulating member; 34a-viscous area; 341a-first part; 342a-second part; 34b-non-viscous area;

[0079] O-thickness direction; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0080] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0081] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0082] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0083] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, C and / or D can represent: C exists alone, C and D exist at the same time, and D exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0085] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0086] The term "plurality" used in the present application refers to two or more (including two).

[0087] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0088] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0089] In some embodiments, the battery may be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0090] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0091] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0092] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0093] A 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 a battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0094] 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.

[0095] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0096] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with silver surface treatment may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0097] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0098] In some embodiments, the positive electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0099] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0100] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, silver surface treated stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0101] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0102] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0103] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.

[0104] In some embodiments, the negative electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy, etc. When the foamed metal is used as the negative electrode sheet, the surface of the foamed metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0105] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0106] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0107] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode. The present application has no particular limitation on the type of separator, and any known porous separator with good chemical stability and mechanical stability can be selected.

[0108] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0109] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0110] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0111] In some embodiments, the electrode assembly is a laminate structure.

[0112] A plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0113] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0114] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0115] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0116] As an example, the separator may be disposed continuously, and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0117] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0118] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0119] In some embodiments, the battery cell may include a shell, which is used to encapsulate the electrode assembly and electrolyte components. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0120] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0121] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0122] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0123] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0124] A battery cell usually includes a pole piece, which is formed into a winding structure or a lamination structure through a winding process or a lamination process. During the manufacturing process of a battery cell, both ends of the pole piece along its own extension direction need to be cut off. After slicing, both ends of the pole piece will produce dust or burrs. Therefore, an insulating member is usually attached to the ends of the pole piece along its own extension direction to cover the two ends of the pole piece, thereby reducing the risk of dust or barbs at the ends of the pole piece damaging the pole piece or diaphragm of the electrode assembly.

[0125] In the related art, the adhesive area of ​​the insulating member is usually set to cover the surface of one side of the insulating member so as to be bonded to the end of the pole piece through the adhesive area. However, in the process of bonding the adhesive area of ​​the insulating member to the pole piece, a part of the adhesive area is easy to produce unnecessary bonding with other structures, which is easy to cause wrinkles on the insulating member and is not conducive to the discharge of bubbles between the insulating member and the pole piece. In this way, the structural strength of the insulating member and the coating effect of the insulating member on the end of the pole piece are affected, resulting in low reliability of the battery cell.

[0126] In view of this, an embodiment of the present application provides a battery cell including a housing, an electrode assembly and at least one insulating member, wherein the electrode assembly is accommodated in the housing, and the electrode sheet of the electrode assembly includes a functional area coated with an active material layer and a hollow foil area not coated with an active material layer, wherein the functional area has a first end along a first direction. The insulating member includes a sticky area and a non-sticky area connected to the sticky area, wherein at least a portion of the sticky area is bonded to the functional area, and at least a portion of the non-sticky area protrudes from the first end along the first direction.

[0127] The battery cell provided in the embodiment of the present application is provided with an insulating part having a non-adhesive area, and at least a part of the non-adhesive area protrudes from the first end along the first direction. The insulating part can reduce the risk of burrs on the first end damaging the pole piece or diaphragm of the electrode assembly. Since the insulating part has a non-adhesive area, in the process of bonding the insulating part to the first end of the pole piece, it is beneficial to reduce the risk of unnecessary bonding between the insulating part itself or the insulating part and other structures, and it is beneficial to reduce the risk of wrinkles on the insulating part, and it is beneficial to improve the smoothness of bubble discharge between the insulating part and the pole piece. In this way, the structural strength of the insulating part is improved, and it is beneficial to improve the supporting strength of the insulating part to the electrode assembly, which is beneficial to improve the reliability performance of the battery cell.

[0128] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0129] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0130] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom, head or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0131] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0132] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0133] Please refer to Figure 2 and Figure 3 , Figure 2 An exploded view of a battery 10 provided in some embodiments of the present application, Figure 3 Schematic diagram of the structure of the battery module 20 in the battery 10 provided in an embodiment of the present application. The battery 10 includes a case 11 and a battery cell 30, and the battery cell 30 is accommodated in the case 11. Among them, the case 11 is used to provide a storage space for the battery cell 30, and the case 11 can adopt a variety of structures. In some embodiments, the case 11 may include a first sub-case 111 and a second sub-case 112, the first sub-case 111 and the second sub-case 112 cover each other, and the first sub-case 111 and the second sub-case 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0134] In the battery 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 may also include other structures, for example, the battery 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0135] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0136] Please refer to Figure 4 , Figure 4 FIG. 1 is an exploded view of a battery cell 30 in a battery 10 provided in an embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and electrode terminals. 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.

[0137] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein 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 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.

[0138] The end cap 312 refers to a component that covers the opening of the shell 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 shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 312. The electrode terminal can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose 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 shell 311 from the end cap 312 to reduce the risk of short circuit. Exemplarily, the insulating structure may be plastic, rubber, or the like.

[0139] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to reduce the risk of internal short circuit between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode body and a positive electrode ear, at least part of the positive electrode body is coated with an active material layer, and at least part of the positive electrode ear is not coated with an active material layer. The negative electrode sheet includes a negative electrode body and a negative electrode ear, at least part of the negative electrode body is coated with an active material layer, and at least part of the negative electrode ear is not coated with an active material layer. The positive electrode body, the negative electrode body and the separator constitute the electrode body of the electrode assembly 32. The positive electrode ear and the negative electrode ear may be located together at one end of the electrode body or at both ends of the electrode body. During the charge and discharge process of the battery cell 30 , the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs 3321 connect the electrode terminals to form a current loop.

[0140] First, as Figure 4 , Figure 5 , Figure 6 and Fig.13As shown, the battery cell 30 provided in the embodiment of the present application includes a housing 31, an electrode assembly 32 and at least one insulating member 34, the electrode assembly 32 is accommodated in the housing 31, the electrode sheet 33 of the electrode assembly 32 includes a functional area 331 coated with an active material layer and a hollow foil area 332 not coated with an active material layer, and the functional area 331 has a first end 331a along the first direction X. The insulating member 34 includes an adhesive area 34a and a non-adhesive area 34b connected to the adhesive area 34a, at least a portion of the adhesive area 34a is bonded to the functional area 331, and at least a portion of the non-adhesive area 34b protrudes from the first end 331a along the first direction X.

[0141] The battery cell 30 includes an electrode assembly 32, and the electrode assembly 32 may include a positive electrode sheet 321 and a negative electrode sheet 322. Optionally, the electrode sheet 33 may be a positive electrode sheet 321, or the electrode sheet 33 may also be a negative electrode sheet 322, or the electrode sheet 33 may be both a negative electrode sheet 322 and a positive electrode sheet 321. In other words, the insulating member 34 may be provided at the end of the positive electrode sheet 321, or the insulating member 34 may be provided at the end of the negative electrode sheet 322, or the insulating member 34 may be provided at the ends of both the positive electrode sheet 321 and the negative electrode sheet 322.

[0142] Optionally, the electrode assembly 32 may be in a wound shape, or the electrode assembly 32 may be in a laminated shape.

[0143] Optionally, the battery cell 30 may be in a polygonal prism shape, or the battery cell 30 may be in a cylindrical shape. Thus, the electrode assembly 32 of the battery cell 30 may be in a cylindrical or prism shape, and the pole piece 33 may be wound in a cylindrical or polygonal prism shape.

[0144] In the embodiment where the electrode assembly 32 is in a winding shape, the first direction X may be the winding direction of the pole piece 33, or the first direction X may be the direction of the empty foil area 332 relative to the functional area 331. That is, the first end 331a may be the end of the functional area 331 along the winding direction of the electrode assembly 32, or the first end 331a may be the end of the functional area 331 facing or facing away from the empty foil area 332. Of course, the functional area 331 may also have the first end 331a along the winding direction of the pole piece 33 and in the direction of the functional area 331 facing or facing away from the empty foil area 332.

[0145] In an embodiment where the electrode assembly 32 is in a stacked shape, the pole piece 33 may be in a sheet shape, and the first end 331a may be the end of the functional area 331 facing toward or away from the empty foil area 332, or the first end 331a may be the end of the functional area 331 along a thickness direction O perpendicular to the pole piece 33 and the arrangement direction of the functional area 331 and the empty foil area 332.

[0146] Optionally, the functional region 331 of a pole piece 33 may have one, two or more first end portions 331 a .

[0147] Optionally, the battery cell 30 may include one insulating member 34, or the battery cell 30 may include two or more insulating members 34. One insulating member 34 may be provided corresponding to one first end 331a, or two insulating members 34 may be provided corresponding to one first end 331a, which may be provided according to actual needs.

[0148] In an embodiment where two insulating members 34 are correspondingly arranged at a first end 331a, at least portions of the adhesive areas 34a of the two edge members 34 can be respectively arranged on both sides of the functional area 331 along the thickness direction O and arranged opposite to each other, and portions of the two insulating members 34 protruding from the first end 331a along the first direction X can be arranged opposite to each other.

[0149] The insulating member 34 includes an adhesive area 34a and a non-adhesive area 34b connected to the adhesive area 34a, and the adhesive area 34a and the non-adhesive area 34b of the insulating member 34 are adjacent to each other, and the adhesive area 34a and the non-adhesive area 34b can be arranged along the first direction X. At least part of the adhesive area 34a is bonded to the functional area 331, and optionally, the adhesive area 34a can be entirely bonded to the functional area 331, or a part of the adhesive area 34a is bonded to the functional area 331, and the other part is protruded from the first end 331a along the first direction X.

[0150] Similarly, at least part of the non-adhesive area 34b protrudes from the first end 331a along the first direction X. Optionally, a part of the non-adhesive area 34b can be set to protrude from the first end 331a along the first direction X, while the other part is arranged opposite to the functional area 331, or the entire non-adhesive area 34b is set to protrude from the first end 331a along the first direction X.

[0151] Alternatively, the adhesive area 34 a and the non-adhesive area 34 b may be arranged along the first direction X, or the adhesive area 34 a and the non-adhesive area 34 b may be arranged along a direction intersecting the first direction X.

[0152] Optionally, one insulating member 34 may have one adhesive region 34a, or one insulating member 34 may have multiple adhesive regions 34a. Similarly, one insulating member 34 may have one or more non-adhesive regions 34b.

[0153] Since at least a portion of the adhesive area 34a of the insulating member 34 is bonded to the functional area 331, and at least a portion of the non-adhesive area 34b protrudes from the first end 331a along the first direction X, the insulating member 34 is arranged to cover the first end 331a. This helps to reduce the risk of dust or burrs on the first end 331a damaging the positive electrode sheet 321, the negative electrode sheet 322 or the diaphragm of the electrode assembly 32.

[0154] It can be understood that the insulating member 34 is disposed at the first end portion 331 a of the functional area 331 . Since the insulating member 34 itself has a certain structural strength, the insulating member 34 can provide a certain support for the electrode assembly 32 .

[0155] In the process of bonding at least a portion of the adhesive area 34a of the insulating member 34 to the functional area 331, the presence of the non-adhesive area 34b can reduce the risk of the insulating member 34 bonding to other unnecessary structures, and reduce the risk of the insulating member 34 bonding to itself, which is beneficial to reducing the possibility of wrinkles on the insulating member 34, and the non-adhesive area 34b can serve as a channel for gas discharge between the adhesive area 34a and the functional area 331, which is beneficial to reducing the risk of bubbles between the adhesive area 34a and the functional area 331, and further beneficial to improving the bonding reliability between the insulating member 34 and the functional area 331, and is beneficial to further reducing the risk of dust or burrs on the first end 331a damaging the electrode assembly 32, and is beneficial to reducing the risk of lithium deposition in the functional area 331.

[0156] The battery cell 30 provided in the embodiment of the present application is configured such that the insulating member 34 has a non-adhesive area 34b, and at least a portion of the non-adhesive area 34b protrudes from the first end 331a along the first direction X, which is beneficial to reducing the risk of burrs on the first end 331a damaging the electrode piece 33 or the diaphragm of the electrode assembly 32, and in the process of bonding the insulating member 34 to the first end 331a of the functional area 331, it is beneficial to reduce the risk of unnecessary bonding connection between the insulating member 34 itself or the insulating member 34 and other structures, and it is beneficial to reduce the risk of wrinkles on the insulating member 34, and it is beneficial to improve the smoothness of bubble discharge between the insulating member 34 and the functional area 331, so that it is beneficial to improve the structural strength of the insulating member 34, and it is beneficial to improve the supporting strength of the insulating member 34 to the electrode assembly 32, and further to improve the reliability of the battery cell 30.

[0157] In some embodiments, Figure 6 , Figure 7 and Fig. 9As shown, at least one insulating member 34 includes two insulating members 34, and the two insulating members 34 include a first insulating member 341 and a second insulating member 342. At least a portion of the adhesive area 34a of the first insulating member 341 and at least a portion of the adhesive area 34a of the second insulating member 342 are respectively bonded to both sides of the functional area 331 along its own thickness direction O, and at least a portion of the non-adhesive area 34b of the first insulating member 341 and at least a portion of the non-adhesive area 34b of the second insulating member 342 protrude from the first end portion 331a along the first direction X.

[0158] Optionally, the arrangement of the adhesive area 34a and the non-adhesive area 34b of the first insulating member 341 and the second insulating member 342 and the sizes thereof extending along the first direction X may be the same or different. The area of ​​the adhesive connection between the first insulating member 341 and the functional area 331 and the area of ​​the adhesive connection between the second insulating member 342 and the functional area 331 may be the same or different.

[0159] Portions of the non-adhesive area 34 b of the first insulating member 341 and the second insulating member 342 protruding from the same first end portion 331 a along the first direction X may be attached to each other or spaced apart from each other.

[0160] In this way, the functional area 331 near the first end 331a is respectively covered by the first insulating member 341 and the second insulating member 342 on both sides along the thickness direction O, which is conducive to reducing the risk of dust or burrs on the first end 331a causing certain damage to the electrode assembly 32. In addition, the insulating member 34 is attached to both sides of the functional area 331 along the thickness direction O, which is conducive to improving the supporting effect of the insulating member 34 on the electrode piece 33, thereby improving the structural stability of the electrode assembly 32.

[0161] In addition, the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 protrude from the first end 331a along the first direction X, respectively, and can be arranged opposite to each other. In this way, in the process of bonding the first insulating member 341 and the second insulating member 342 to the functional area 331 of the first end 331a on both sides along the thickness direction O, the bubbles between the first insulating member 341 and the second insulating member 342 and the functional area 331 can be discharged from the gap between the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342. In this way, the area of ​​mutual bonding of the first insulating member 341 and the second insulating member 342 can be reduced, and the risk of bubbles or wrinkles generated by the first insulating member 341 and the second insulating member 342 during the bonding process can be reduced. In addition, at least part of the functional area 331 close to the first end 331a is covered by the first insulating member 341 and the second insulating member 342 on both sides along the thickness direction O, respectively, which is conducive to reducing the risk of lithium precipitation in the functional area 331.

[0162] Therefore, the first insulating member 341 and the second insulating member 342 are respectively bonded to the two sides of the functional area 331 along the thickness direction O, which is conducive to improving the coating effect of the insulating member 34 on the first end 331a, and is conducive to reducing the risk of the burrs of the first end 331a damaging the electrode assembly 32, and the insulating member 34 can provide a strong support for the electrode assembly 32, reducing the risk of collapse of the electrode assembly 32. The bubbles generated during the bonding process of the insulating member 34 and the functional area 331 can be discharged through the gap between the non-adhesive area 34b of the first insulating member 341 and the second insulating member 342, which is conducive to reducing the risk of wrinkles on the insulating member 34 and the risk of lithium deposition in the functional area 331.

[0163] In some embodiments, Figure 6 , Figure 7 and Figure 8 As shown, the adhesive area 34a includes a first portion 341a and a second portion 342a, the second portion 342a is located between the first portion 341a and the non-adhesive area 34b, and the second portion 342a protrudes from the first end portion 331a along the first direction X. The first portion 341a of the first insulating member 341 and the first portion 341a of the second insulating member 342 are respectively bonded to both sides of the functional area 331 along the thickness direction O, and the second portion 342a of the first insulating member 341 and the second portion 342a of the second insulating member 342 are bonded to each other.

[0164] In this way, the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 are all set beyond the first end 331a, and the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 can be relatively set, and bubbles generated during the process of mutual bonding of the second parts 342a of the first insulating member 341 and the second insulating member 342 can be discharged through the gap between the relatively set non-adhesive areas 34b.

[0165] The adhesive area 34a includes a first portion 341a and a second portion 342a. The first portion 341a of the adhesive area 34a is bonded to the functional area 331. The second portions 342a of the adhesive areas 34a of the first insulating member 341 and the second insulating member 342 are bonded to each other. Since the second portion 342a is arranged beyond the first end portion 331a along the first direction X, the two second portions 342a of the first insulating member 341 and the second insulating member 342 can respectively cover the end faces of the first end portion 331a. In this way, the first insulating member 341 and the second insulating member 342 can better cover the first end portion 331a, which is conducive to further reducing the risk of dust or burrs of the first end portion 331a damaging the electrode assembly 32. In addition, the bonding connection of the second portion 342a beyond the first end portion 331a is conducive to increasing the structural strength of the insulating member 34, thereby increasing the supporting force of the insulating member 34 on the electrode assembly 32 and reducing the risk of collapse of the electrode assembly 32.

[0166] Furthermore, the portion of the functional area 331 close to the first end 331 a is bonded to the first insulating member 341 and the second insulating member 342 on both sides along the thickness direction O, which is beneficial to further reduce the risk of lithium deposition in the functional area 331 .

[0167] In some embodiments, Figure 8 As shown, the non-adhesive area 34b of the first insulating member 341 and the non-adhesive area 34b of the second insulating member 342 are in contact.

[0168] The non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 respectively extend beyond the first end 331a along the first direction X and contact each other. For example, the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 can fit each other. In this way, the non-adhesive areas 34b that contact each other have a higher structural strength, can provide a greater supporting force for the electrode assembly 32, and are conducive to further reducing the risk of collapse of the electrode assembly 32.

[0169] In some embodiments, Figure 6 As shown, the dimension a of the first portion 341 a along the first direction X satisfies: 1 mm≤a≤7 mm.

[0170] Optionally, a can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm or 7mm, etc.

[0171] It is understandable that, to a certain extent, the smaller the value of a is, the more conducive it is to reducing the bonding area between the insulating member 34 and the functional area 331, so that the risk of bubbles generated during the bonding process between the insulating member 34 and the functional area 331 is reduced, and the risk of wrinkles in the first portion 341a bonded to the functional area 331 is reduced. To a certain extent, the larger the value of a is, the more conducive it is to improving the coverage effect of the insulating member 34 on the functional area 331 of the electrode piece 33, and the more conducive it is to reducing the risk of burrs or dust at the first end 331a piercing the electrode assembly 32.

[0172] Therefore, after systematic analysis and long-term practice, the inventors found that setting 1mm≤a≤7mm is beneficial to reducing the risk of bubbles generated between the insulating part 34 and the functional area 331, and is beneficial to reducing the process difficulty of bonding the insulating part 34 and the functional area 331. It is also beneficial to improve the covering effect of the insulating part 34 on the first end 331a of the pole piece 33, and is beneficial to reducing the risk of burrs or dust at the first end 331a damaging the electrode assembly 32.

[0173] In some embodiments, Figure 6 As shown, the dimension b of the non-adhesive area 34b along the first direction X satisfies: 3mm≤b≤15mm.

[0174] Optionally, b can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, etc.

[0175] It can be understood that, to a certain extent, the larger the value of b is, the more conducive it is to improving the structural strength of the non-adhesive area 34b and the supporting force of the non-adhesive area 34b on the electrode assembly 32. And, to a certain extent, the smaller the value of b is, the more conducive it is to reducing the volume occupied by the insulating member 34 and improving the energy density of the battery cell 30.

[0176] After systematic analysis and long-term practice, the inventors found that setting 3mm≤b≤15mm is beneficial to improving the supporting effect of the non-adhesive area 34b on the electrode assembly 32 while reducing the volume occupied by the insulating member 34, thereby improving the energy density of the battery cell 30.

[0177] In some embodiments, Figure 7 and Figure 8 As shown, the functional area 331 has two first end portions 331 a along the first direction X, and at least one insulating member 34 is correspondingly disposed at each first end portion 331 a.

[0178] In this way, at least one insulating member 34 is provided at each of the two first ends 331 a of the functional area 331 along the first direction X, which is beneficial to further reduce the risk of burrs or dust on the first ends 331 a causing certain damage to the electrode assembly 32 .

[0179] In some embodiments, Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, the electrode assembly 32 includes at least one positive electrode sheet 321 and at least one negative electrode sheet 322 , the electrode sheet 33 is the positive electrode sheet 321 , and / or the electrode sheet 33 is the negative electrode sheet 322 .

[0180] Optionally, the electrode sheet 33 may be any one of the positive electrode sheet 321 and the negative electrode sheet 322 , or the electrode sheet 33 may be both the positive electrode sheet 321 and the negative electrode sheet 322 .

[0181] That is, the insulating member 34 may be provided only at at least one end of the positive electrode sheet 321 , or only at at least one end of the negative electrode sheet 322 , or the insulating member 34 may be provided at at least one end of the positive electrode sheet 321 and at least one end of the negative electrode sheet 322 .

[0182] The electrode assembly 32 may include a plurality of positive electrode sheets 321 or a plurality of negative electrode sheets 322, the electrode sheet 33 may be one or all of the plurality of positive electrode sheets 321, and the electrode sheet 33 may be one or all of the plurality of negative electrode sheets 322. In other words, an insulating member 34 may be provided at least one end of one or more positive electrode sheets 321 along the first direction X, or an insulating member 34 may be provided at least one end of one or more negative electrode sheets 322 along the first direction X.

[0183] The electrode sheet 33 is set to be at least one of the positive electrode sheet 321 and the negative electrode sheet 322, and the insulating member 34 can be used to provide a certain protection for at least one of the positive electrode sheet 321 and the negative electrode sheet 322, thereby reducing the risk of dust or burrs on the first end 331a of the positive electrode sheet 321 or the negative electrode sheet 322 damaging the positive electrode sheet 321 or the negative electrode sheet 322.

[0184] In some embodiments, Fig. 9 and Fig.10 As shown, the functional area 331 has two second ends 331 b in the second direction Y, at least one of the second ends 331 b is connected to the empty foil area 332 , and the second direction Y intersects with the first direction X.

[0185] At least part of the empty foil area 332 can be used as the tab 3321 of the electrode assembly 32, and the empty foil area 332 is connected to the second end 331b, and the tab 3321 of the electrode assembly 32 can be led out from the end of the functional area 331 along the second direction Y. Optionally, the tab 3321 can be provided at either end of the functional area 331 along the second direction Y, or the tab 3321 is provided at both ends of the functional area 331 along the second direction Y.

[0186] The first direction X intersects with the second direction Y. For example, the first direction X may be perpendicular to the second direction Y. When the electrode assembly 32 is in a winding shape, the first direction X may be the winding direction of the electrode assembly 32, and the first end 331a may be at least one end of the pole piece 33 along the winding direction. The insulating member 34 is provided at the end of the pole piece 33 along the winding direction, so that the insulating member 34 can provide a better coating effect for the first end 331a, which is conducive to reducing the risk of burrs or dust on the first end 331a damaging the electrode assembly 32.

[0187] In some embodiments, Fig. 9 and Fig.10 As shown, along the second direction Y, the insulating member 34 exceeds at least one second end 331 b; and / or, along the second direction Y, the size of the insulating member 34 is greater than or equal to the size of the functional area 331 .

[0188] Optionally, the insulating member 34 extends beyond one second end portion 331 b along the second direction Y, or both ends of the insulating member 34 along the second direction Y extend beyond two second end portions 331 b.

[0189] In this way, the insulating member 34 covers at least one end of the first end portion 331a along the second direction Y, and the insulating member 34 covers at least one end of the functional area 331 close to the first end portion 331a along the second direction Y, which is beneficial to further reduce the risk of dust or burrs at the first end portion 331a damaging the electrode assembly 32, and further helps to reduce the risk of lithium deposition in the functional area 331.

[0190] In some embodiments, Fig. 9 and Fig.10 As shown, the empty foil area 332 is disposed beyond the insulating member 34 along the second direction Y.

[0191] It is understandable that, during the shaping process of the pole tab 3321, the portion of the insulating member 34 that exceeds the second end 331b of the functional area 331 will be shaped together with the empty foil area 332. If the empty foil area 332 is arranged to exceed the insulating member 34 along the second direction Y, it is beneficial to reduce the adverse effect of the insulating member 34 on the shaping process of the pole tab 3321 during the shaping process of the pole tab 3321, facilitate the smooth progress of the shaping process of the pole tab 3321, and help improve the current capacity of the pole tab 3321 formed after shaping.

[0192] In some embodiments, Fig. 9 and Fig.10 As shown, the dimension c of the insulating member 34 extending beyond the functional area 331 along the second direction Y satisfies 0<c≤mm.

[0193] Optionally, c can be 0.1mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm or mm, etc.

[0194] It is understandable that the larger the value of c, the more conducive it is to improve the coating effect of the insulating member 34 on the first end 331a, reduce the risk of dust or burrs at the first end 331a piercing the electrode assembly 32, and reduce the risk of lithium deposition at the first end 331a. The smaller the value of c, the easier it is to smoothly carry out the shaping process of the tab 3321, and it is conducive to improving the current capacity of the tab 3321 after shaping.

[0195] After systematic analysis and long-term practice, the inventors found that setting 0<c≤mm is beneficial to reducing the risk of dust or burrs at the first end 331a piercing the electrode assembly 32, and is beneficial to reducing the risk of lithium deposition in the part of the functional area 331 close to the first end 331a, and is also beneficial to improving the current carrying capacity of the shaped pole ear 3321.

[0196] In some embodiments, 0<c≤5mm.

[0197] Optionally, c can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0198] After further systematic analysis and long-term practice, the inventors found that setting 0<c≤5mm is beneficial to reducing the risk of dust or burrs at the first end 331a damaging the electrode assembly 32, while further helping to reduce the risk of lithium deposition in the functional area 331 close to the first end 331a, and further helping to improve the current carrying capacity of the shaped pole ear 3321.

[0199] In some embodiments, Fig.11 As shown, the empty foil area 332 is connected to the end of the functional area 331 along the first direction X.

[0200] At least part of the empty foil area 332 can be used as a part of the pole ear 3321 of the electrode assembly 32. The empty foil area 332 is connected to the end of the functional area 331 along the first direction X, and the pole ear 3321 is led out from the end of the functional area 331 along the first direction X.

[0201] Optionally, the empty foil area 332 may be connected to the first end 331 a , or the empty foil area 332 may be connected to an end of the functional area 331 along the first direction X opposite to the first end 331 a .

[0202] In this way, the insulating member 34 is connected to the first end portion 331a of the functional area 331. In an embodiment in which the electrode assembly 32 is wound, the insulating member 34 may also be in a wound shape, which is beneficial to increase the supporting force of the insulating member 34 on the electrode assembly 32. In an embodiment in which the electrode assembly 32 is in a stacked shape, the insulating member 34 may also be stacked, and the supporting force of the insulating member 34 on the electrode assembly 32 can still be provided.

[0203] Therefore, providing the empty foil area 332 connected to the end of the functional area 331 along the first direction X is beneficial to improving the supporting force of the insulating member 34 on the electrode assembly 32 .

[0204] In some embodiments, Fig.11 and Fig.12As shown, the empty foil area 332 includes a plurality of spaced-apart tabs 3321, the first end portion 331a includes a tab lead-out portion 3311a and a non-tab lead-out portion 3312a, the tab 3321 is only led out from the tab lead-out portion 3311a, and the insulating member 34 covers at least a portion of the non-tab lead-out portion 3312a.

[0205] Optionally, the insulating members 34 may be disposed continuously along the third direction Z, or the insulating members 34 may be disposed at intervals along the third direction Z.

[0206] The tabs 3321 and the functional area 331 can be integrally formed, and a plurality of tabs 3321 arranged at intervals can be formed by cutting. During the cutting process, the non-tab lead-out portion 3312a between the tabs 3321 will inevitably produce burrs or dust, etc., and by providing an insulating member to cover at least part of the non-tab lead-out portion 3312a, it is helpful to reduce the risk of the burrs or dust of the non-tab lead-out portion 3312a piercing the electrode assembly 32. The insulating member 34 covers the lead end of the non-tab lead-out portion 3312a, which is helpful to reduce the risk of the tab 3321 overlapping the functional area 331 and causing an internal short circuit in the battery cell 30.

[0207] In some embodiments, Fig.12 As shown, the functional area 331 has two third ends 331 c in the third direction Z, and the third direction Z intersects with the first direction X. Along the third direction Z, the insulating member 34 exceeds at least one third end 331 c; and / or, along the third direction Z, the size of the insulating member 34 is greater than or equal to the size of the functional area 331.

[0208] Optionally, the insulating member 34 can be arranged beyond one or two third end portions 331c. In this way, the insulating member 34 can cover at least one end of the first end portion 331a along the third direction Z, which is beneficial to further improve the covering effect of the insulating member 34 on the first end portion 331a, further beneficial to reduce the risk of burrs or dust on the first end portion 331a damaging the electrode assembly 32, and beneficial to improve the supporting force of the insulating member 34 on the electrode assembly 32.

[0209] In some embodiments, Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, the functional area 331 is in a winding shape, the first direction X is the winding direction, the first end 331a is the starting end, and the starting end is located at the end of the innermost circle of the functional area 331 along the winding direction.

[0210] In this way, the insulating member 34 is arranged at the starting end of the pole piece 33, that is, the insulating member 34 is arranged at the end of the innermost circle of the pole piece 33. The insulating member 34 can reduce the risk of dust or burrs at the starting end piercing the electrode assembly 32 while providing good support for the electrode assembly 32, thereby reducing the risk of collapse or deformation of the electrode assembly 32.

[0211] In some embodiments, Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, the first end 331a is the tail end, and the tail end is located at the end of the outermost circle of the functional area 331 along the winding direction.

[0212] Thus, the insulating member 34 is disposed at the tail end of the pole piece 33 , which helps to reduce the risk of dust or burrs at the outermost tail end of the pole piece 33 causing certain damage to the electrode assembly 32 , and helps to improve the reliability of the battery cell 30 .

[0213] In some embodiments, Fig.14 and Fig.15 As shown, the pole piece 33 is in a winding shape, the first end 331a is the starting end, the starting end is located at the end of the innermost circle of the pole piece 33, and the first end 331a is the ending end of the pole piece 33, and the ending end is located at the end of the outermost circle of the pole piece 33.

[0214] In this way, insulating parts 34 are provided at the starting end and the ending end of the pole piece 33 , which is beneficial to further reduce the risk of burrs or dust at the end of the pole piece 33 piercing the electrode assembly 32 , and further beneficial to improve the reliability of the battery cell 30 .

[0215] In some embodiments, Fig.16 As shown, the portion of the non-adhesive area 34 b that exceeds the starting end along the winding direction is wound inside the pole piece 33 .

[0216] The portion of the non-adhesive area 34b that exceeds the starting end is wound inside the electrode piece 33, so the wound non-adhesive area 34b has a higher structural strength, which is beneficial to further improve the supporting effect of the non-adhesive area 34b on the electrode assembly 32, and further helps to reduce the risk of internal collapse or deformation of the electrode assembly 32.

[0217] In some embodiments, the portion of the non-adhesive area 34b beyond the starting end is wound into n turns, where 1≤n≤10.

[0218] Optionally, n can be 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, etc.

[0219] It can be understood that the larger the value of n is, the more conducive it is to improving the supporting strength of the non-adhesive area 34b of the insulating member 34 to the electrode assembly 32, while the smaller the value of n is, the more conducive it is to reducing the space occupied by the insulating member 34 and improving the energy density of the battery cell 30.

[0220] Therefore, after systematic analysis and long-term practice, the inventors found that setting 1≤n≤10 is beneficial to improving the supporting strength of the non-sticky area 34b to the electrode assembly 32, while also helping to reduce the space inside the battery cell 30 occupied by the non-sticky area 34b, thereby helping to improve the energy density of the battery cell 30.

[0221] In some embodiments, the electrode assembly 32 is in a winding shape, and the empty foil area 332 is connected to the end of the functional area 331 along the first direction X, and the first direction X is perpendicular to the winding direction of the electrode assembly 32 .

[0222] The electrode assembly 32 is in a wound shape, and the empty foil area 332 is connected to the end of the functional area 331 along the first direction X. The first direction X can be the direction in which the pole ear 3321 of the electrode assembly 32 is led out. In this way, the first end 331a is wound along the winding direction, and the insulating member 34 can be wound along the first end 331a, which is beneficial to improve the supporting force of the insulating member 34 on the electrode assembly 32 and reduce the risk of internal collapse of the electrode assembly 32.

[0223] In some embodiments, the functional area 331 is in a laminated shape, and the empty foil area 332 is connected to the end of the functional area 331 along the first direction X.

[0224] The functional area 331 is in the shape of a stack, and the multiple pole pieces 33 are stacked, and the insulating member 34 can also be stacked, which is beneficial to improving the supporting force of the insulating member 34 on the electrode assembly 32, and further beneficial to improving the structural stability of the electrode assembly 32.

[0225] In some embodiments, the functional area 331 is in a laminated shape and has two second ends 331b in the second direction Y. At least one second end 331b is connected to the empty foil area 332. The second direction Y, the first direction X and the thickness direction O of the functional area 331 are perpendicular to each other.

[0226] The functional area 331 is in a stacked shape, and the first direction X, the second direction Y and the thickness direction O of the functional area 331 are perpendicular to each other. The first direction X is perpendicular to the lead-out direction of the pole ear 3321. The insulating member 34 is arranged at the first end 331a. The insulating member 34 can also be stacked, which is beneficial to reduce the risk of puncturing the diaphragm by burrs at the first end 331a of the functional area 331, and is beneficial to improve the supporting force of the insulating member on the electrode assembly 32.

[0227] In a second aspect, the battery 10 provided in the embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0228] The battery 10 provided in the embodiment of the present application has the same technical effect as the battery cell 30 provided in any of the above embodiments, and thus will not be described in detail here.

[0229] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery cell 30 or the battery 10 provided in any of the above embodiments, and the battery 10 is used to provide electrical energy.

[0230] The electric device provided in the embodiment of the present application has the same technical effect as the battery cell 30 or the battery 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0231] In some embodiments, Figures 4 to 16As shown, the battery cell 30 provided in the present application includes a housing 31, an electrode assembly 32 and a plurality of insulating members 34. The electrode assembly 32 is accommodated in the housing 31. The electrode sheet 33 of the electrode assembly 32 includes a functional area 331 coated with an active material layer and an empty foil area 332 not coated with an active material layer. The electrode assembly 32 is wound along a first direction X, and the functional area 331 has two first end portions 331a at both ends along the first direction X. The first end portions 331a are a starting end and a tail end, the starting end is located at the innermost end of the functional area 331 along the first direction X, and the tail end is located at the outermost end of the functional area 331 along the first direction X. The plurality of insulating members 34 include a first insulating member 341 and a second insulating member 342. The insulating member 34 includes an adhesive area 34a and a non-adhesive area 34b connected to the adhesive area 34a. The adhesive area 34a includes a first portion 341a and a second portion 342a. The second portion 342a is located between the first portion 341a and the non-adhesive area 34b, and the second portion 342a protrudes from the first end portion 331a along the first direction X. The first portion 341a of the first insulating member 341 and the first portion 341a of the second insulating member 342 are respectively bonded to both sides of the functional area 331 along the thickness direction O, and the second portion 342a of the first insulating member 341 and the second portion 342a of the second insulating member 342 are bonded to each other. The non-adhesive area 34b is arranged to protrude from the first end portion 331a along the first direction X, and the non-adhesive area 34b of the first insulating member 341 contacts the non-adhesive area 34b of the second insulating member 342. The dimension a of the first portion 341a along the first direction X satisfies: 1mm≤a≤7mm, and the dimension b of the non-adhesive area 34b along the first direction X satisfies: 3mm≤b≤15mm. The portion of the non-adhesive area 34b that exceeds the starting end along the winding direction is wound n turns inside the pole piece 33, 1≤n≤10. The functional area 331 has two second ends 331b in the second direction Y, at least one second end 331b is connected to the empty foil area 332, and the second direction Y intersects with the first direction X. Along the second direction Y, the insulating member 34 exceeds the second end 331b, the dimension of the insulating member 34 is greater than or equal to the dimension of the functional area 331, and the empty foil area 332 is arranged beyond the insulating member 34 along the second direction Y. The dimension c of the insulating member 34 that exceeds the functional area 331 along the second direction Y satisfies: 0<c≤mm.

[0232] The battery cell 30 provided in the embodiment of the present application is configured such that the insulating member 34 has a non-adhesive area 34b, and at least a portion of the non-adhesive area 34b protrudes from the first end 331a along the first direction X, which is beneficial to reducing the risk of burrs on the first end 331a damaging the electrode piece 33 or the diaphragm of the electrode assembly 32, and in the process of bonding the insulating member 34 to the first end 331a of the functional area 331, it is beneficial to reduce the risk of unnecessary bonding connection between the insulating member 34 itself or the insulating member 34 and other structures, and it is beneficial to reduce the risk of wrinkles on the insulating member 34, and it is beneficial to improve the smoothness of bubble discharge between the insulating member 34 and the functional area 331, so that it is beneficial to improve the structural strength of the insulating member 34, and it is beneficial to improve the supporting strength of the insulating member 34 to the electrode assembly 32, and further to improve the reliability of the battery cell 30.

[0233] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Although the present application has been described with reference to the preferred embodiments, various improvements can be made thereto and the components therein 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 various technical features mentioned in the various embodiments 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: include: shell; An electrode assembly, contained in the housing, wherein the electrode sheet of the electrode assembly comprises a functional area coated with an active material layer and a hollow foil area not coated with an active material layer, wherein the functional area has a first end along a first direction; At least one insulating member includes an adhesive area and a non-adhesive area connected to the adhesive area, at least a portion of the adhesive area is adhered to the functional area, and at least a portion of the non-adhesive area protrudes from the first end along the first direction.

2. The battery cell according to claim 1, characterized in that: The at least one insulating member includes two insulating members, and the two insulating members include a first insulating member and a second insulating member. At least a portion of the adhesive area of ​​the first insulating member and at least a portion of the adhesive area of ​​the second insulating member are respectively bonded to both sides of the functional area along the thickness direction of the functional area, and at least a portion of the non-adhesive area of ​​the first insulating member and at least a portion of the non-adhesive area of ​​the second insulating member protrude from the first end along the first direction.

3. The battery cell according to claim 2, characterized in that: The adhesive area includes a first part and a second part, the second part is located between the first part and the non-adhesive area, and the second part protrudes from the first end along the first direction; the first part of the first insulating member and the first part of the second insulating member are respectively bonded to both sides of the functional area along the thickness direction, and the second part of the first insulating member and the second part of the second insulating member are bonded to each other.

4. The battery cell according to claim 2, characterized in that: The non-adhesive area of ​​the first insulating member contacts the non-adhesive area of ​​the second insulating member.

5. The battery cell according to claim 3, characterized in that: A dimension a of the first portion along the first direction satisfies: 1 mm ≤ a ≤ 7 mm.

6. The battery cell according to claim 1, characterized in that: A dimension b of the non-adhesive area along the first direction satisfies: 3 mm ≤ b ≤ 15 mm.

7. The battery cell according to claim 1, characterized in that: The functional area has two first end portions along the first direction, and at least one insulating member is correspondingly disposed at any one of the first end portions.

8. The battery cell according to claim 1, characterized in that: The electrode assembly includes at least one positive electrode sheet and at least one negative electrode sheet, the electrode sheet is the positive electrode sheet, and / or the electrode sheet is the negative electrode sheet.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The functional area has two second ends in a second direction, at least one of the second ends is connected to the empty foil area, and the second direction intersects the first direction.

10. The battery cell according to claim 9, characterized in that: Along the second direction, the insulating member extends beyond at least one of the second ends; and / or, along the second direction, a size of the insulating member is greater than or equal to a size of the functional area.

11. The battery cell according to claim 10, characterized in that: The empty foil area is disposed beyond the insulating member along the second direction.

12. The battery cell according to claim 10, characterized in that: A dimension c of the insulating member extending beyond the functional area along the second direction satisfies: 0<c≤30 mm.

13. The battery cell according to claim 12, characterized in that: 0<c≤5mm.

14. The battery cell according to any one of claims 1 to 8, characterized in that: The empty foil area is connected to an end of the functional area along the first direction.

15. The battery cell according to claim 14, characterized in that: The empty foil area includes a plurality of spaced-apart tabs, the first end includes a tab lead-out portion and a non-tab lead-out portion, the tab is only led out from the tab lead-out portion, and the insulating member covers at least a portion of the non-tab lead-out portion.

16. The battery cell according to claim 14, characterized in that: The functional area has two third ends in a third direction, and the third direction intersects with the first direction; Along the third direction, the insulating member extends beyond at least one of the third ends; and / or, along the third direction, a size of the insulating member is greater than or equal to a size of the functional area.

17. The battery cell according to any one of claims 1 to 8, characterized in that: The functional area is in a winding shape, the first direction is the winding direction, the first end is the starting end, the starting end is located at the end of the innermost circle of the functional area along the winding direction, and / or the first end is the ending end, and the ending end is located at the end of the outermost circle of the functional area along the winding direction.

18. The battery cell according to claim 17, characterized in that: The portion of the non-adhesive area that exceeds the starting end along the winding direction is wound inside the pole piece.

19. The battery cell according to claim 18, characterized in that: The portion of the non-adhesive area beyond the starting end is wound in n turns, where 1≤n≤10.

20. The battery cell according to any one of claims 1 to 8, characterized in that: The electrode assembly is in a winding shape, and the empty foil area is connected to the end of the functional area along the first direction, and the first direction is perpendicular to the winding direction of the electrode assembly.

21. The battery cell according to any one of claims 1 to 8, characterized in that: The functional area is in a laminated shape, and the empty foil area is connected to the end of the functional area along the first direction.

22. The battery cell according to any one of claims 1 to 8, characterized in that: The functional area is in a laminated shape and has two second ends in a second direction, at least one of the second ends is connected to the empty foil area, and the second direction, the first direction and the thickness direction of the functional area are perpendicular to each other.

23. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 22.

24. An electrical device, characterized in that: Comprising a battery as claimed in claim 23, the battery is used to provide electrical energy.

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