Battery cell, battery and electric device

Abstract

A battery cell (30), a battery (10) and an electrical device, the battery cell (30) comprising a housing (31), an electrode assembly (32) and at least one insulator (34), the electrode assembly (32) being accommodated in the housing (31), a pole piece (33) of the electrode assembly (32) comprising a functional region (331) coated with an active material layer and an empty foil region (332) not coated with an active material layer, the functional region (331) having a first end portion (331a) in a first direction. The insulating part (34) comprises an adhesive area (34a) and a non-adhesive area (34b) connected to the adhesive area (34a), at least part of the adhesive area (34a) is adhered to the functional area (331), and at least part of the non-adhesive area (34b) protrudes out of the first end portion (331a) in the first direction. The battery cell (30) is advantageous to reduce the risk of wrinkling of the insulating member, to improve the smoothness of bubble discharge between the insulating member (34) and the functional region (331), to improve the structural strength of the insulating member (34), to improve the support strength of the insulating member (34) to the electrode assembly (32), and to further improve the reliability of the battery cell (30).

Description

Battery cell, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, and more particularly, to a battery cell, a battery and an electric device. BACKGROUND

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

[0003] In the development of battery technology, in addition to improving the performance of the battery cell, how to improve the reliability of the battery cell is also a problem that cannot be ignored. Therefore, how to improve the reliability of the battery cell is a continuous improvement technical problem in the battery technology.

[0004] SUMMARY

[0005] The present application provides a battery cell, a battery and an electric device to improve the reliability of the battery cell.

[0006] In a first aspect, the battery cell provided by the embodiments of the present application comprises a shell, an electrode assembly and at least one insulating piece, the electrode assembly is contained in the shell, the pole piece of the electrode assembly comprises a functional area coated with an active material layer and a blank foil area without the active material layer, the functional area has a first end portion along a first direction. The insulating piece comprises an adhesive area and a non-adhesive area connected to the adhesive area, at least part of the adhesive area is bonded to the functional area, and at least part of the non-adhesive area protrudes from the first end portion along the first direction.

[0007] The battery cell provided by the embodiments of the present application has the non-adhesive area of the insulating piece, and at least part of the non-adhesive area protrudes from the first end portion along the first direction, which is conducive to reducing the risk of burrs and other damages to the pole piece or the diaphragm of the electrode assembly at the first end portion, and conducive to reducing the risk of unnecessary bonding connection of the insulating piece itself or the insulating piece and other structures during the process of bonding the insulating piece to the first end portion of the functional area, conducive to reducing the risk of wrinkles of the insulating piece, and conducive to improving the smoothness of bubble discharge between the insulating piece and the functional area, thus conducive to improving the structural strength of the insulating piece, and conducive to improving the support strength of the electrode assembly by the insulating piece, and further conducive to improving the reliability of the battery cell.

[0008] According to some embodiments of the present application, the 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 part of the adhesive region of the first insulating member and at least part of the adhesive region of the second insulating member are respectively bonded to two sides of the functional region along the thickness direction of the functional region, and at least part of the non-adhesive region of the first insulating member and at least part of the non-adhesive region of the second insulating member protrude from the first end portion along the first direction.

[0009] In the above scheme, the first insulating member and the second insulating member are respectively bonded to two sides of the functional region along the thickness direction, which is beneficial to improve the covering effect of the insulating member on the first end portion, reduce the risk of damage to the electrode assembly caused by burrs and the like of the first end portion, and provide strong support to the electrode assembly to reduce the risk of collapse of the electrode assembly. The bubbles generated during the bonding of the insulating member and the functional region can be discharged through the gap between the non-adhesive regions of the first insulating member and the second insulating member, which is beneficial to reduce the risk of wrinkles of the insulating member and the risk of lithium precipitation.

[0010] According to some embodiments of the present application, the adhesive region includes a first part and a second part, the second part is located between the first part and the non-adhesive region, and the second part protrudes from the first end portion 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 two sides of the functional region 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.

[0011] In the above scheme, the first insulating member and the second insulating member can better cover the first end portion, which is beneficial to further reduce the risk of damage to the electrode assembly caused by dust or burrs of the first end portion. The second part protruding beyond the first end portion is bonded and connected, which is beneficial to increase the structural strength of the insulating member, thereby improving the support force of the insulating member on the electrode assembly and reducing the risk of collapse of the electrode assembly. In addition, the parts of the functional region close to the first end portion are respectively bonded and connected to the first insulating member and the second insulating member along the thickness direction, which is beneficial to further reduce the risk of lithium precipitation of the functional region.

[0012] According to some embodiments of the present application, the non-adhesive region of the first insulating member and the non-adhesive region of the second insulating member are in contact.

[0013] In the above scheme, the non-adhesive regions in contact with each other have higher structural strength and can provide greater support to the electrode assembly, which is beneficial to further reduce the risk of collapse of the electrode assembly.

[0014] According to some embodiments of the present application, the size a of the first part along the first direction satisfies: 1mm≤a≤7mm.

[0015] In the above solution, the 1mm≤a≤7mm is configured, which is beneficial to reduce the risk of generating bubbles between the insulating piece and the functional area, reduce the process difficulty of bonding the insulating piece and the functional area, improve the covering effect of the insulating piece on the first end portion of the pole piece, and reduce the risk of burrs or dust of the first end portion hurting the electrode assembly.

[0016] According to some embodiments of the present application, the size b of the non-adhesion area along the first direction satisfies: 3mm≤b≤15mm.

[0017] In the above solution, the 3mm≤b≤15mm is configured, which is beneficial to improve the supporting effect of the non-adhesion area on the electrode assembly while reducing the volume occupied by the insulating piece, thereby improving the energy density of the battery cell.

[0018] 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 piece is arranged at any first end portion.

[0019] In the above solution, at least one insulating piece is arranged at each of the two first end portions of the functional area along the first direction, which is beneficial to further reduce the risk of burrs or dust of the first end portion damaging the electrode assembly.

[0020] According to some embodiments of the present application, the electrode assembly includes at least one positive pole piece and at least one negative pole piece, the pole piece is a positive pole piece, and / or the pole piece is a negative pole piece.

[0021] In the above solution, the pole piece is at least one of the positive pole piece and the negative pole piece, which can provide protection for at least one of the positive pole piece and the negative pole piece by using the insulating piece, and reduce the risk of dust or burrs generated by the first end portion of the positive pole piece or the negative pole piece entering the inside of the electrode assembly and damaging the positive pole piece or the negative pole piece.

[0022] According to some embodiments of the present application, the functional area has two second end portions in the second direction, and at least one second end portion is connected to the empty foil area, and the second direction intersects the first direction.

[0023] In the above solution, the insulating piece is arranged at the end portion of the pole piece along the winding direction, so that the insulating piece can provide better covering effect for the first end portion, and reduce the risk of burrs or dust of the first end portion damaging the electrode assembly.

[0024] According to some embodiments of the present application, along the second direction, the insulating piece exceeds the at least one second end portion; and / or, along the second direction, the size of the insulating piece is greater than or equal to the size of the functional area.

[0025] In the above scheme, the rim covers at least one end of the first end portion along the second direction, and the insulating member covers at least one end of the part of the functional area close to the first end portion along the second direction, which is conducive to further reducing the risk of the first end portion being pricked by dust or burrs and the like of the electrode assembly, and further conducive to reducing the risk of lithium precipitation in the functional area.

[0026] According to some embodiments of the present application, the empty foil area is arranged beyond the insulating member along the second direction.

[0027] In the above scheme, the empty foil area is arranged beyond the insulating member along the second direction, which is conducive to reducing the adverse effects of the insulating member on the tab shaping process, facilitating the smooth progress of the tab shaping process, and improving the flow capacity of the tab after shaping.

[0028] According to some embodiments of the present application, the size c of the insulating member beyond the functional area along the second direction satisfies 0

[0029] In the above scheme, the size c is set to 0

[0030] According to some embodiments of the present application, 0

[0031] In the above scheme, the size c is set to 0

[0032] According to some embodiments of the present application, the empty foil area is connected to the end of the functional area along the first direction.

[0033] In the above scheme, the empty foil area is connected to the end of the functional area along the first direction, which is conducive to improving the support of the insulating member on the electrode assembly.

[0034] According to some embodiments of the present application, the empty foil area includes a plurality of tabs arranged at intervals, the first end portion includes tab leading portions and non-tab leading portions, the tabs are only led out by the tab leading portions, and the insulating member covers at least part of the non-tab leading portions.

[0035] In the above scheme, by arranging the insulating member to cover at least part of the non-tab leading portions, the risk of the non-tab leading portions being pricked by burrs or dust and the like of the electrode assembly is reduced. Moreover, the insulating member covers the non-tab leading end, which is conducive to reducing the risk of internal short circuit of the battery monomer caused by the tabs being overlapped with the functional area.

[0036] According to some embodiments of the present application, the functional area has two third ends in a third direction, the third direction intersects the first direction. In the third direction, the insulating piece exceeds at least one third end; and / or, in the third direction, the size of the insulating piece is greater than or equal to the size of the functional area.

[0037] In the above scheme, the insulating piece can cover at least one end of the first end in the third direction, which is conducive to further improving the covering effect of the insulating piece on the first end, further conducive to reducing the risk of damage to the electrode assembly by burrs or dust of the first end, and conducive to improving the supporting force of the insulating piece on the electrode assembly.

[0038] According to some embodiments of the present application, the functional area is in a winding shape, the first direction is a winding direction, the first end is a starting end, and the starting end is located at the end of the innermost circle of the functional area in the winding direction.

[0039] In the above scheme, the insulating piece is arranged at the starting end of the pole piece, that is, the insulating piece is arranged at the end of the innermost circle of the pole piece. The insulating piece can not only reduce the risk of damage to the electrode assembly by dust or burrs of the starting end, but also provide good support to the electrode assembly, thereby reducing the risk of collapse or deformation of the electrode assembly.

[0040] According to some embodiments of the present application, the first end is an ending end, and the ending end is located at the end of the outermost circle of the functional area in the winding direction.

[0041] In the above scheme, the insulating piece is arranged at the ending end of the pole piece, which is conducive to reducing the risk of damage to the electrode assembly by dust or burrs of the ending end of the outermost circle of the pole piece, and is conducive to improving the reliability of the battery monomer.

[0042] According to some embodiments of the present application, the non-adhesive area is wound inside the pole piece 33 in the part exceeding the starting end in the winding direction.

[0043] In the above scheme, the non-adhesive area arranged in a winding manner has high structural strength, which is conducive to further improving the supporting effect of the non-adhesive area on the electrode assembly, and further conducive to reducing the risk of collapse or deformation of the electrode assembly.

[0044] According to some embodiments of the present application, the non-adhesive area is wound in n turns in the part exceeding the starting end, 1≤n≤10.

[0045] In the above scheme, 1≤n≤10 is arranged, which is conducive to improving the supporting strength of the non-adhesive area on the electrode assembly while reducing the space occupied by the non-adhesive area in the battery monomer, thereby improving the energy density of the battery monomer.

[0046] According to some embodiments of this application, the electrode assembly is wound, and the empty foil area is connected to the end of the functional area along a first direction, which is perpendicular to the winding direction of the electrode assembly.

[0047] In the above scheme, the insulating component can be wound around the first end, which helps to improve the supporting force of the insulating component on the electrode assembly and reduce the risk of internal collapse of the electrode assembly.

[0048] According to some embodiments of this application, the functional area is stacked, and the empty foil area is connected to the end of the functional area along a first direction.

[0049] In the above scheme, the insulating components can also be stacked, which helps to improve the supporting force of the insulating components on the electrode assembly, and thus helps to improve the structural stability of the electrode assembly.

[0050] According to some embodiments of this application, the functional area is in the form of a stack, and the functional area 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.

[0051] In the above scheme, the insulating components can also be stacked, which helps to reduce the risk of burrs or other defects at the first end of the functional area puncturing the diaphragm and improves the supporting force of the insulating components on the electrode assembly.

[0052] Secondly, the battery provided in the embodiments of this application includes the battery cell provided in any of the above embodiments.

[0053] The battery provided in this application embodiment has the same technical effect because it uses the battery cell provided in any of the above embodiments.

[0054] Thirdly, embodiments of this application provide an electrical device including a battery cell or battery as provided in any of the above embodiments, wherein the battery is used to provide electrical energy.

[0055] The electrical device provided in this application has the same technical effect because it uses the battery cell or battery provided in any of the above embodiments, and will not be described again here.

[0056] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0058] Fig. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0059] Fig. 2 is an exploded schematic diagram of a battery according to an embodiment of the present application;

[0060] Fig. 3 is a structural schematic diagram of a battery module in a battery according to an embodiment of the present application;

[0061] Fig. 4 is an exploded structural schematic diagram of a battery cell according to an embodiment of the present application;

[0062] Fig. 5 is a structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to an embodiment of the present application;

[0063] Fig. 6 is a sectional structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to an embodiment of the present application;

[0064] Fig. 7 is a sectional structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to another embodiment of the present application;

[0065] Fig. 8 is a sectional structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to still another embodiment of the present application;

[0066] Fig. 9 is a structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to another embodiment of the present application;

[0067] Fig. 10 is a structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to still another embodiment of the present application;

[0068] Fig. 11 is a structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to yet another embodiment of the present application;

[0069] Fig. 11 is a structural schematic diagram of a cooperation between a tab and an insulating member in a battery cell according to yet another embodiment of the present application;

[0070] Fig. 13 is a sectional structural schematic diagram of an electrode assembly in a battery cell according to an embodiment of the present application;

[0071] Fig. 14 is a sectional structural schematic diagram of an electrode assembly in a battery cell according to another embodiment of the present application;

[0072] Fig. 15 is a sectional structural schematic diagram of an electrode assembly in a battery cell according to still another embodiment of the present application;

[0073] Fig. 16 is a sectional structural schematic diagram of an electrode assembly in a battery cell according to yet another embodiment of the present application.

[0074] In the drawings, the drawings are not drawn according to the actual proportions.

[0075] Explanation of reference numerals: 1 - vehicle; 10 - battery; 111 - first sub-box body; 112 - second sub-box body; 11 - box body; 1a - motor; 1b - controller; 20 - battery module; 30 - battery cell; 31 - case; 311 - case body; 312 - end cover; 32 - electrode assembly; 321 - positive electrode sheet; 322 - negative electrode sheet; 33 - electrode sheet; 331 - functional area; 331a - first end portion; 3311a - tab lead-out portion; 3312a - non-tab lead-out portion; 331b - second end portion; 331c - third end portion; 332 - empty foil area; 3321 - tab; 34 - insulating member; 341 - first insulating member; 342 - second insulating member; 34a - adhesive area; 341a - first portion; 342a - second portion; 34b - non-adhesive area; O - thickness direction; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0076] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0077] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0078] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0079] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0080] In the present application, the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, C and / or D can mean that C exists alone, C and D exist together, and D exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0081] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0082] "Multiple" appearing in the present application means two or more (including two).

[0083] In the present application, the battery cell can 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. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are also not limited thereto.

[0084] The battery mentioned in the embodiments of the present application can 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 a mixed connection through a busbar.

[0085] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0086] In some embodiments, the battery can be a battery pack, which includes a box body and battery cells, and the battery cells or battery modules are contained in the box body.

[0087] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0088] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0089] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0090] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0091] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0092] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, silver surface-treated stainless steel, copper, aluminum, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (e.g., polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. 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 can also be used. These positive electrode active materials can be used alone or in combination with two or more.

[0094] In some embodiments, the positive electrode can be a foamed carbon or a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When the foamed metal is used as the positive electrode, the surface of the foamed metal can not be provided with the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0095] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0096] As an example, the negative current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver surface-treated stainless steel, copper, aluminum, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0097] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0098] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0099] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, or the like.

[0100] In some embodiments, the negative electrode can employ a foamed carbon or a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, or the like. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative active material, or can be provided with a negative active material.

[0101] As an example, a lithium source material, a potassium metal, or a sodium metal can also be filled or / and deposited in the negative current collector, the lithium source material being lithium metal and / or a lithium-rich material.

[0102] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0103] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode. The type of the separator is not particularly limited in the present application, and any known porous structure separator having good chemical stability and mechanical stability can be used.

[0104] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0105] In some embodiments, the battery cell further comprises an electrolyte, which functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application and can be selected as desired. The electrolyte can be in a liquid, gel or solid state.

[0106] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0107] In some embodiments, the electrode assembly is in a stack structure.

[0108] A plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0109] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be sandwiched between adjacent folded segments.

[0110] As an example, both the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0111] As an example, a plurality of separator films can be provided, and each of the plurality of separator films can be provided between any adjacent positive electrode sheet or negative electrode sheet.

[0112] As an example, a plurality of separator films can be provided, and each of the plurality of separator films can be provided between any adjacent positive electrode sheet or negative electrode sheet.

[0113] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0114] In some embodiments, the electrode assembly can be provided with a tab, which can guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0115] In some embodiments, the battery cell can include a housing, which can be used to encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., a polypropylene shell), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film.

[0116] In some embodiments, the housing can include an end cap and a shell body, and the shell body can be provided with an opening. The end cap can close the opening to form a sealed space for accommodating the electrode assembly and other substances such as the electrolyte. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0117] In some embodiments, the housing can be provided with at least one electrode terminal, which can be electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via a current collector. The electrode terminal can be provided on the end cap or on the shell body.

[0118] In some embodiments, an explosion-proof valve is arranged on the shell. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0119] By way of 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 including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like, without particular limitation.

[0120] The battery cell generally includes a tab, which is formed into a jelly-roll structure or a stacked structure through a jelly-roll process or a stacking process. During the manufacturing process of the battery cell, the tab needs to be cut at both ends along the extension direction thereof. After cutting, dust or burrs are generated at both ends of the tab. Therefore, an insulating member is generally attached to the end of the tab along the extension direction thereof to cover both ends of the tab, so as to reduce the risk of the dust or burrs at the end of the tab damaging the tab or the separator of the electrode assembly.

[0121] In the related art, an adhesive area of the insulating member is generally arranged to cover the surface of one side of the insulating member, so as to be attached to the end of the tab through the adhesive area. However, during the process of attaching the adhesive area of the insulating member to the tab, a part of the adhesive area is prone to unnecessary attachment to other structures, which is easy to cause the insulating member to have wrinkles and the like, and is not conducive to the discharge of bubbles between the insulating member and the tab. As a result, the structural strength of the insulating member and the covering effect of the insulating member on the end of the tab are affected, and the reliability of the battery cell is low.

[0122] Therefore, the embodiments of the present application provide a battery cell including a shell, an electrode assembly, and at least one insulating member. The electrode assembly is accommodated in the shell. The tab of the electrode assembly includes a functional area coated with an active material layer and a blank foil area not coated with the active material layer. The functional area has a first end portion along a first direction. The insulating member includes an adhesive area and a non-adhesive area connected to the adhesive area. At least a part of the adhesive area is attached to the functional area. At least a part of the non-adhesive area protrudes from the first end portion along the first direction.

[0123] The battery cell provided by the embodiments of the present application has the non-adhesive area of the insulating member, and at least a part of the non-adhesive area protrudes from the first end portion. The insulating member can reduce the risk of burrs or the like at the first end portion damaging the tab or the separator of the electrode assembly. Since the insulating member has the non-adhesive area, the risk of unnecessary attachment of the insulating member itself or the insulating member and other structures is reduced during the process of attaching the insulating member to the first end portion of the tab. The risk of wrinkles of the insulating member is reduced, and the smoothness of the discharge of bubbles between the insulating member and the tab is improved. As a result, the structural strength of the insulating member is improved, and the support strength of the insulating member on the electrode assembly is improved, thereby improving the reliability of the battery cell.

[0124] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0125] The following embodiments take the vehicle as an example for convenience of description.

[0126] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1 is internally provided with a battery 10, which can be arranged at the bottom, the head, or the tail of the vehicle 1. The battery 10 can be used for power supply of the vehicle 1, for example, the battery 10 can be used as an operating power source of the vehicle 1, and is used for the circuit system of the vehicle 1, such as the working power demand during starting, navigation, and running of the vehicle 1.

[0127] The vehicle 1 can further include a controller 1b and a motor 1a, and the controller 1b is used to control the battery 10 to supply power to the motor 1a, such as the working power demand during starting, navigation, and running of the vehicle 1.

[0128] In some embodiments of the present application, the battery 10 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, to replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1.

[0129] Please refer to FIG. 2 and FIG. 3, FIG. 2 is an exploded view of the battery 10 provided by some embodiments of the present application, and FIG. 3 is a structural schematic view of the battery module 20 in the battery 10 provided by the embodiments of the present application. The battery 10 comprises a box body 11 and a battery cell 30, and the battery cell 30 is contained in the box body 11. Among them, the box body 11 is used to provide a containing space for the battery cell 30, and the box body 11 can adopt various structures. In some embodiments, the box body 11 can comprise a first sub-box body 111 and a second sub-box body 112, the first sub-box body 111 and the second sub-box body 112 are mutually covered, and the first sub-box body 111 and the second sub-box body 112 jointly define a containing space for containing the battery cell 30. The second sub-box body 112 can be a hollow structure with one end open, and the first sub-box body 111 can be a plate-shaped structure, which covers the open side of the second sub-box body 112 to jointly define the containing space with the second sub-box body 112; the first sub-box body 111 and the second sub-box body 112 can also be hollow structures with one side open, and the open side of the first sub-box body 111 covers the open side of the second sub-box body 112.

[0130] In the battery 10, the battery cell 30 can be multiple, and the multiple battery cells 30 can be connected in series, in parallel or in a mixed manner. The mixed connection means that there are both series connection and parallel connection among the multiple battery cells 30. The multiple battery cells 30 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 30 is contained in the box body 11; of course, the battery 10 can also be that the multiple battery cells 30 are first connected in series, in parallel or in a mixed manner to form a battery module 20, and then the multiple battery modules 20 are connected in series, in parallel or in a mixed manner to form a whole, which is contained in the box body 11. The battery 10 can also comprise other structures, for example, the battery 10 can also comprise a current combing component for realizing the electrical connection among the multiple battery cells 30.

[0131] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0132] Please refer to FIG. 4, which is an exploded view of the battery cell 30 in the battery 10 provided by the embodiments of the present application. As shown in FIG. 4, the battery cell 30 comprises an outer shell 31, an electrode assembly 32 and an electrode terminal. The outer shell 31 comprises a shell body 311 and an end cover 312, the shell body 311 has an opening, and the end cover 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0133] The shell 311 is a component for fitting the end cover 312 to form an internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, electrolyte and other components. The shell 311 and the end cover 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.

[0134] The end cover 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 cover 312 can be adapted to the shape of the shell 311 to fit the shell 311. Optionally, the end cover 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 312 is not easily deformed when subjected to extrusion collision, so that the battery cell 30 can have higher structural strength, and the reliability can also be improved. The end cover 312 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 32 for outputting or inputting the electrical energy of the battery cell 30. The material of the end cover 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 312, which can be used to isolate the electrical connection components in the shell 311 from the end cover 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0135] The electrode assembly 32 is a component in which electrochemical reactions occur in the battery cell 30. One or more electrode assemblies 32 can be contained in the shell 311. The electrode assembly 32 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and generally a separator is provided between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to reduce the risk of internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode body and a positive electrode tab, at least part of the positive electrode body is coated with an active material layer, and at least part of the positive electrode tab is not coated with the active material layer. The negative electrode sheet includes a negative electrode body and a negative electrode tab, at least part of the negative electrode body is coated with an active material layer, and at least part of the negative electrode tab is not coated with the active material layer, and the positive electrode body, the negative electrode body and the separator constitute an electrode body of the electrode assembly 32. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body or at two ends of the electrode body respectively. In the charging and discharging process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tab 3321 is connected with the electrode terminal to form a current loop.

[0136] In a first aspect, as shown in FIGS. 4, 5, 6 and 13, the battery cell 30 provided by the embodiments of the present application includes a housing 31, an electrode assembly 32 and at least one insulating member 34, the electrode assembly 32 is accommodated in the housing 31, the tab 33 of the electrode assembly 32 includes a functional area 331 coated with an active material layer and a blank foil area 332 not coated with the active material layer, the functional area 331 has a first end portion 331a in a first direction X. The insulating member 34 includes a sticky area 34a and a non-sticky area 34b connected to the sticky area 34a, at least a part of the sticky area 34a is bonded to the functional area 331, and at least a part of the non-sticky area 34b protrudes beyond the first end portion 331a in the first direction X.

[0137] The battery cell 30 includes the electrode assembly 32, which can include a positive tab 321 and a negative tab 322. Optionally, the tab 33 can be the positive tab 321, or the tab 33 can also be the negative tab 322, or the tab 33 can be both the negative tab 322 and the positive tab 321. That is, the insulating member 34 can be arranged at the end of the positive tab 321, or the insulating member 34 can be arranged at the end of the negative tab 322, or the insulating member 34 can be arranged at the end of both the positive tab 321 and the negative tab 322.

[0138] Optionally, the electrode assembly 32 can be in a wound shape, or the electrode assembly 32 can be in a stacked shape.

[0139] Optionally, the battery cell 30 can be in a polygonal shape, or the battery cell 30 can be in a cylindrical shape. In this way, the electrode assembly 32 of the battery cell 30 can be in a cylindrical shape or a polygonal shape, and the tab 33 can be wound in a cylindrical shape or a polygonal shape.

[0140] In the embodiment in which the electrode assembly 32 is in a wound shape, the first direction X can be the winding direction of the tab 33, or the first direction X can be the direction of the blank foil area 332 relative to the functional area 331. That is, the first end portion 331a can be the end of the functional area 331 in the winding direction of the electrode assembly 32, or the first end portion 331a can be the end of the functional area 331 towards or away from the blank foil area 332, and of course, the functional area 331 can have the first end portion 331a in both the winding direction of the tab 33 and the direction of the functional area 331 towards or away from the blank foil area 332.

[0141] In the embodiment in which the electrode assembly 32 is in a stacked shape, the tab 33 can be in a sheet shape, the first end portion 331a can be the end of the functional area 331 towards or away from the blank foil area 332, or the first end portion 331a can be the end of the functional area 331 in the direction perpendicular to the thickness direction O of the tab 33 and the arrangement direction of the functional area 331 and the blank foil area 332.

[0142] Optionally, the functional area 331 of one pole piece 33 can have one, two or more first end portions 331a.

[0143] Optionally, the battery cell 30 can include one insulating piece 34, or the battery cell 30 is provided with two or more insulating pieces 34. One first end portion 331a can correspond to one insulating piece 34, or one first end portion 331a corresponds to two insulating pieces 34, which can be provided according to actual needs.

[0144] In the embodiment in which one first end portion 331a corresponds to two insulating pieces 34, at least part of the adhesive areas 34a of the two insulating pieces 34 can be respectively arranged on both sides of the functional area 331 along the thickness direction O and oppositely arranged, and the portions of the two insulating pieces 34 protruding from the first end portion 331a along the first direction X can be oppositely arranged.

[0145] The insulating piece 34 includes the adhesive area 34a and the non-adhesive area 34b connected to the adhesive area 34a, and the adhesive area 34a and the non-adhesive area 34b of the insulating piece 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 provided to 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 arranged to protrude from the first end portion 331a along the first direction X.

[0146] Similarly, at least part of the non-adhesive area 34b protrudes from the first end portion 331a along the first direction X, and optionally, a part of the non-adhesive area 34b can be arranged to protrude from the first end portion 331a along the first direction X, and the other part is arranged opposite to the functional area 331, or the non-adhesive area 34b is arranged to entirely protrude from the first end portion 331a along the first direction X.

[0147] Optionally, the adhesive area 34a and the non-adhesive area 34b can be arranged along the first direction X, or the adhesive area 34a and the non-adhesive area 34b can be arranged along a direction intersecting the first direction X.

[0148] Optionally, one insulating piece 34 can have one adhesive area 34a, or one insulating piece 34 can have multiple adhesive areas 34a. Similarly, one insulating piece 34 can have one or more non-adhesive areas 34b.

[0149] Since at least part of the adhesive area 34a of the insulation piece 34 is adhered to the functional area 331, and at least part of the non-adhesive area 34b protrudes from the first end 331a in the first direction X, the insulation piece 34 covers the first end 331a, and thus, the risk of dust or burrs of the first end 331a damaging the positive plate 321, the negative plate 322 or the separator of the electrode assembly 32 is reduced.

[0150] It can be understood that the insulation piece 34 is arranged at the first end 331a of the functional area 331, and since the insulation piece 34 itself has a certain structural strength, the insulation piece 34 can provide a certain support to the electrode assembly 32.

[0151] In the process of adhering at least part of the adhesive area 34a of the insulation piece 34 to the functional area 331, the existence of the non-adhesive area 34b can reduce the risk of the insulation piece 34 being adhered to other unnecessary structures, and reduce the risk of the insulation piece 34 being adhered to itself, which is beneficial to reduce the possibility of the insulation piece 34 being wrinkled, and the non-adhesive area 34b can serve as a channel for gas to be discharged between the adhesive area 34a and the functional area 331, which is beneficial to reduce the risk of bubbles existing between the adhesive area 34a and the functional area 331, thereby improving the adhesion reliability of the insulation piece 34 and the functional area 331, which is beneficial to further reduce the risk of dust or burrs of the first end 331a damaging the electrode assembly 32, and is beneficial to reduce the risk of lithium precipitation in the functional area 331.

[0152] The battery monomer 30 provided by the embodiment of the application has the non-adhesive area 34b of the insulation piece 34, and at least part of the non-adhesive area 34b protrudes from the first end 331a in the first direction X, which is beneficial to reduce the risk of burrs of the first end 331a damaging the plate 33 or the separator of the electrode assembly 32, and in the process of adhering the insulation piece 34 to the first end 331a of the functional area 331, it is beneficial to reduce the risk of the insulation piece 34 being adhered to other structures or the insulation piece 34 being adhered to itself, which is beneficial to reduce the risk of the insulation piece 34 being wrinkled, and is beneficial to improve the smoothness of the bubbles being discharged between the insulation piece 34 and the functional area 331, which is beneficial to improve the structural strength of the insulation piece 34, and is beneficial to improve the support strength of the insulation piece 34 to the electrode assembly 32, and thus, the reliability of the battery monomer 30 is improved.

[0153] In some embodiments, as shown in FIGS. 6, 7 and 9, the at least one insulating member 34 includes two insulating members 34, which include a first insulating member 341 and a second insulating member 342, at least part of the adhesive area 34a of the first insulating member 341 and at least part of the adhesive area 34a of the second insulating member 342 are respectively bonded to two sides of the functional area 331 along the thickness direction O of the functional area 331, at least part of the non-adhesive area 34b of the first insulating member 341 and at least part of the non-adhesive area 34b of the second insulating member 342 protrude from the first end 331a along the first direction X.

[0154] 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 size of each extending along the first direction X can be the same or different. The bonding area of the first insulating member 341 and the functional area 331 and the bonding area of the second insulating member 342 and the functional area 331 can be the same or different.

[0155] The part of the non-adhesive area 34b of the first insulating member 341 and the second insulating member 342 protruding from the same first end 331a along the first direction X can be attached to each other or spaced apart from each other.

[0156] In this way, the 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, which is beneficial to reduce the risk of dust or burrs of the first end 331a causing damage to the electrode assembly 32. And the functional area 331 is attached with the insulating member 34 on both sides along the thickness direction O, which is beneficial to improve the supporting effect of the insulating member 34 on the electrode sheet 33, and further improve the structural stability of the electrode assembly 32.

[0157] And the part of the non-adhesive area 34b of the first insulating member 341 and the second insulating member 342 protruding from the first end 331a along the first direction X can be oppositely arranged, so that in the process of bonding the first insulating member 341 and the second insulating member 342 to the functional area 331 on both sides along the thickness direction O of the first end 331a, the air bubbles between the first insulating member 341 and the second insulating member 342 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, so that the bonding area of the first insulating member 341 and the second insulating member 342 can be reduced, and the risk of air bubbles or wrinkles 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, which is beneficial to reduce the risk of lithium precipitation of the functional area 331.

[0158] 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 beneficial to improve the covering effect of the insulating member 34 on the first end portion 331a, reduce the risk of damage to the electrode assembly 32 caused by burrs or the like of the first end portion 331a, and provide stronger support to the electrode assembly 32 to reduce the risk of collapse of the electrode assembly 32. The bubbles generated during the bonding of the insulating member 34 and the functional area 331 can be discharged through the gap between the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342, which is beneficial to reduce the risk of wrinkles of the insulating member 34 and reduce the risk of lithium precipitation of the functional area 331.

[0159] In some embodiments, as shown in FIGS. 6, 7 and 8, 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 the two 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.

[0160] In this way, the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 are all arranged outside the first end portion 331a, and the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 can be arranged oppositely. The bubbles generated during the bonding of the second portions 342a of the first insulating member 341 and the second insulating member 342 to each other can be discharged through the gap between the oppositely arranged non-adhesive areas 34b.

[0161] The adhesive area 34a includes a plurality of first portions 341a and second portions 342a, the first portions 341a of the adhesive area 34a are bonded to the functional area 331, and the second portions 342a of the adhesive area 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 outside 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 surface 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 beneficial to further reduce the risk of damage to the electrode assembly 32 caused by dust or burrs or the like of the first end portion 331a. In addition, the second portion 342a arranged outside the first end portion 331a is bonded, which is beneficial to increase the structural strength of the insulating member 34, thereby improving the supporting force of the insulating member 34 on the electrode assembly 32 and reducing the risk of collapse of the electrode assembly 32.

[0162] Further, the portion of the functional area 331 close to the first end portion 331a is adhesively connected with the first insulating member 341 and the second insulating member 342 on both sides in the thickness direction O, which is conducive to further reducing the risk of lithium precipitation in the functional area 331.

[0163] In some embodiments, as shown in FIG. 8, 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.

[0164] The non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 respectively extend beyond the first end portion 331a in the first direction X and are in contact. Exemplarily, the non-adhesive areas 34b of the first insulating member 341 and the second insulating member 342 can be in close contact with each other. In this way, the non-adhesive areas 34b in contact with each other have higher structural strength and can provide greater support to the electrode assembly 32, which is conducive to further reducing the risk of collapse of the electrode assembly 32.

[0165] In some embodiments, as shown in FIG. 6, the size a of the first portion 341a in the first direction X satisfies: 1mm≤a≤7mm.

[0166] Optionally, a can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm or 7mm, etc.

[0167] It can be understood that the smaller the value of a is, the more conducive it is to reduce the area of the adhesive connection between the insulating member 34 and the functional area 331. In this way, it is more conducive to reducing the risk of air bubbles generated in the process of bonding the insulating member 34 and the functional area 331, and reducing the risk of wrinkles in the first portion 341a bonded to the functional area 331. The larger the value of a is, the more conducive it is to improve the coverage effect of the insulating member 34 on the functional area 331 of the pole piece 33, and the more conducive it is to reduce the risk of burrs or dust of the first end portion 331a injuring the electrode assembly 32.

[0168] Therefore, the inventors have found through systematic analysis and long-term practice that setting 1mm≤a≤7mm is conducive to reducing the risk of air bubbles generated between the insulating member 34 and the functional area 331, reducing the process difficulty of bonding the insulating member 34 and the functional area 331, improving the coverage effect of the insulating member 34 on the first end portion 331a of the pole piece 33, and reducing the risk of burrs or dust of the first end portion 331a injuring the electrode assembly 32.

[0169] In some embodiments, as shown in FIG. 6, the size b of the non-adhesive area 34b in the first direction X satisfies: 3mm≤b≤15mm.

[0170] Optionally, b can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, etc.

[0171] It can be understood that the greater the value of b, the more conducive to improving the structural strength of the non-adhesive area 34b, and the more conducive to improving the support of the electrode assembly 32 by the non-adhesive area 34b. The smaller the value of b, the more conducive to reducing the volume occupied by the insulating piece 34, and the more conducive to improving the energy density of the battery monomer 30.

[0172] The inventor has found through systematic analysis and long-term practice that setting 3mm≤b≤15mm is conducive to improving the support of the electrode assembly 32 by the non-adhesive area 34b while reducing the volume occupied by the insulating piece 34, thereby improving the energy density of the battery monomer 30.

[0173] In some embodiments, as shown in FIGS. 7 and 8, the functional area 331 has two first ends 331a in the first direction X, and any first end 331a corresponds to at least one insulating piece 34.

[0174] In this way, the functional area 331 has two first ends 331a in the first direction X, and each first end 331a corresponds to at least one insulating piece 34, which is conducive to further reducing the risk of damage to the electrode assembly 32 caused by burrs or dust at the first end 331a.

[0175] In some embodiments, as shown in FIGS. 13, 14, 15 and 16, the electrode assembly 32 includes at least one positive electrode sheet 321 and at least one negative electrode sheet 322, and the electrode sheet 33 is the positive electrode sheet 321, and / or the electrode sheet 33 is the negative electrode sheet 322.

[0176] Optionally, the electrode sheet 33 can be any one of the positive electrode sheet 321 and the negative electrode sheet 322, or the electrode sheet 33 can be both the positive electrode sheet 321 and the negative electrode sheet 322.

[0177] That is, the insulating piece 34 can 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 piece 34 can be provided at at least one end of the positive electrode sheet 321 and at least one end of the negative electrode sheet 322.

[0178] The electrode assembly 32 can include a plurality of positive electrode tabs 321 or a plurality of negative electrode tabs 322, the electrode tab 33 can be one or all of the plurality of positive electrode tabs 321, or the electrode tab 33 can be one or all of the plurality of negative electrode tabs 322. In other words, the insulating member 34 can be arranged at at least one end of the one or more positive electrode tabs 321 in the first direction X, or the insulating member 34 can be arranged at at least one end of the one or more negative electrode tabs 322 in the first direction X.

[0179] The electrode tab 33 is arranged as at least one of the positive electrode tab 321 and the negative electrode tab 322, and the insulating member 34 can be used to provide protection for at least one of the positive electrode tab 321 and the negative electrode tab 322, thereby reducing the risk of dust or burrs on the first end portion 331a of the positive electrode tab 321 or the negative electrode tab 322 damaging the positive electrode tab 321 or the negative electrode tab 322.

[0180] In some embodiments, as shown in FIGS. 9 and 10, the functional area 331 has two second end portions 331b in a second direction Y, and at least one second end portion 331b is connected to the empty foil area 332, and the second direction Y intersects the first direction X.

[0181] At least part of the empty foil area 332 can serve as a tab 3321 of the electrode assembly 32, and the empty foil area 332 is connected to the second end portion 331b, so that the tab 3321 of the electrode assembly 32 can be led out from the end of the functional area 331 in the second direction Y. Alternatively, the tab 3321 can be arranged at any end of the functional area 331 in the second direction Y, or the tab 3321 can be arranged at both ends of the functional area 331 in the second direction Y.

[0182] The first direction X intersects the second direction Y, and exemplary, the first direction X can be perpendicular to the second direction Y. In the case of the electrode assembly 32 being in a wound shape, the first direction X can be the winding direction of the electrode assembly 32, and the first end portion 331a can be at least one end of the electrode tab 33 in the winding direction. The insulating member 34 is arranged at the end of the electrode tab 33 in the winding direction, so that the insulating member 34 can provide better coverage for the first end portion 331a, thereby reducing the risk of burrs or dust on the first end portion 331a damaging the electrode assembly 32.

[0183] In some embodiments, as shown in FIGS. 9 and 10, the insulating member 34 extends beyond at least one second end portion 331b in the second direction Y; and / or, the size of the insulating member 34 in the second direction Y is greater than or equal to the size of the functional area 331.

[0184] Alternatively, the insulating member 34 extends beyond one second end portion 331b in the second direction Y, or the insulating member 34 extends beyond two second end portions 331b at both ends in the second direction Y.

[0185] 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 portion of the functional area 331 close to the first end portion 331a along the second direction Y, which is conducive to further reducing the risk of the first end portion 331a being pricked by dust or burrs of the electrode assembly 32, and further conducive to reducing the risk of lithium precipitation in the functional area 331.

[0186] In some embodiments, as shown in FIGS. 9 and 10, the empty foil area 332 is arranged beyond the insulating member 34 along the second direction Y.

[0187] It can be understood that, in the shaping process, the portion of the insulating member 34 beyond the second end portion 331b of the functional area 331 will be shaped together with the empty foil area 332. By arranging the empty foil area 332 beyond the insulating member 34 along the second direction Y, it is conducive to reducing the adverse effect of the insulating member 34 on the shaping process of the tab 3321, facilitating the smooth progress of the shaping process of the tab 3321, and conducive to improving the flow capacity of the tab 3321 after shaping.

[0188] In some embodiments, as shown in FIGS. 9 and 10, the size c of the insulating member 34 beyond the functional area 331 along the second direction Y satisfies 0 < c ≤ mm.

[0189] Alternatively, c can be 0.1 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, or mm, etc.

[0190] It can be understood that, the greater the value of c is, the more conducive to improving the cladding effect of the insulating member 34 on the first end portion 331a, reducing the risk of the first end portion 331a being pricked by dust or burrs of the electrode assembly 32, and conducive to reducing the risk of lithium precipitation in the portion of the functional area 331 close to the first end portion 331a. The smaller the value of c is, the more conducive to facilitating the smooth progress of the shaping process of the tab 3321, and conducive to improving the flow capacity of the tab 3321 after shaping.

[0191] The inventor has found through systematic analysis and long-term practice that, by arranging 0 < c ≤ mm, it is conducive to reducing the risk of the first end portion 331a being pricked by dust or burrs of the electrode assembly 32, and conducive to reducing the risk of lithium precipitation in the portion of the functional area 331 close to the first end portion 331a, and conducive to improving the flow capacity of the tab 3321 after shaping.

[0192] In some embodiments, 0 < c ≤ 5 mm.

[0193] Optionally, c can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, etc.

[0194] The inventor has found through further systematic analysis and long-term practice that setting 0 < c ≤ 5 mm is conducive to further reducing the risk of lithium precipitation in the area of the functional zone 331 close to the first end 331a and further improving the overcurrent capacity of the tab 3321 after shaping, on the premise of reducing the risk of the first end 331a of the electrode assembly 32 being scratched by dust or burrs.

[0195] In some embodiments, as shown in FIG. 11, the empty foil area 332 is connected to the end of the functional zone 331 along the first direction X.

[0196] At least part of the empty foil area 332 can be part of the tab 3321 of the electrode assembly 32, and the empty foil area 332 is connected to the end of the functional zone 331 along the first direction X, so that the tab 3321 is led out from the end of the functional zone 331 along the first direction X.

[0197] Optionally, the empty foil area 332 can be connected to the first end 331a, or the empty foil area 332 is connected to the end of the functional zone 331 along the first direction X opposite to the first end 331a.

[0198] In this way, the insulating member 34 is connected to the first end 331a of the functional zone 331, and in the embodiment in which the electrode assembly 32 is in a wound state, the insulating member 34 can also be in a wound state, which is conducive to improving the support force of the insulating member 34 on the electrode assembly 32, and in the embodiment in which the electrode assembly 32 is in a laminated state, the insulating member 34 can also be arranged in a laminated manner, which can still provide the support force of the insulating member 34 on the electrode assembly 32.

[0199] Therefore, the arrangement of the empty foil area 332 connected to the end of the functional zone 331 along the first direction X is conducive to improving the support force of the insulating member 34 on the electrode assembly 32.

[0200] In some embodiments, as shown in FIGS. 11 and 12, the empty foil area 332 includes a plurality of spaced tabs 3321, the first end 331a includes a tab leading portion 3311a and a non-tab leading portion 3312a, the tab 3321 is only led out by the tab leading portion 3311a, and the insulating member 34 covers at least part of the non-tab leading portion 3312a.

[0201] Optionally, the insulating member 34 can be continuously arranged along the third direction Z, or the insulating member 34 is arranged along the third direction Z.

[0202] The tab 3321 and the functional area 331 can be integrally formed, and a plurality of spaced tabs 3321 are formed by cutting. In the cutting process, burrs or dust will inevitably be generated in the non-tab lead-out part 3312a between the tabs 3321. By arranging the insulating piece 34 to cover at least part of the non-tab lead-out part 3312a, the risk of the non-tab lead-out part 3312a being damaged by burrs or dust is reduced. Moreover, the insulating piece 34 covers the lead-out end of the non-tab lead-out part 3312a, which reduces the risk of internal short circuit of the battery monomer 30 caused by the overlap of the tab 3321 and the functional area 331.

[0203] In some embodiments, as shown in FIG. 12, the functional area 331 has two third ends 331c in a third direction Z intersecting the first direction X. Along the third direction Z, the insulating piece 34 exceeds at least one third end 331c; and / or, along the third direction Z, the size of the insulating piece 34 is greater than or equal to the size of the functional area 331.

[0204] Optionally, the insulating piece 34 can exceed one or two third ends 331c, so that the insulating piece 34 can cover at least one end of the first end 331a in the third direction Z, which further improves the coverage effect of the insulating piece 34 on the first end 331a, further reduces the risk of the first end 331a being damaged by burrs or dust, and improves the support of the insulating piece 34 on the electrode assembly 32.

[0205] In some embodiments, as shown in FIGS. 13, 14, 15 and 16, the functional area 331 has a winding shape, the first direction X is the winding direction, and the first end 331a is the starting end, which is located at the end of the innermost circle of the functional area 331 in the winding direction.

[0206] In this way, the insulating piece 34 is arranged at the starting end of the pole piece 33, i.e., the insulating piece 34 is arranged at the end of the innermost circle of the pole piece 33. The insulating piece 34 not only reduces the risk of the starting end being damaged by burrs or dust, but also provides good support for the electrode assembly 32, thereby reducing the risk of the electrode assembly 32 collapsing or deforming.

[0207] In some embodiments, as shown in FIGS. 13, 14, 15 and 16, the first end 331a is the ending end, which is located at the end of the outermost circle of the functional area 331 in the winding direction.

[0208] In this way, the insulating piece 34 is arranged at the ending end of the pole piece 33, which reduces the risk of the ending end of the outermost circle of the pole piece 33 being damaged by burrs or dust, and improves the reliability of the battery monomer 30.

[0209] In some embodiments, as shown in FIGS. 14 and 15, the pole piece 33 is in a winding shape, the first end 331a is a starting end, which is located at an end of an innermost circle of the pole piece 33, and the first end 331a is an ending end of the pole piece 33, which is located at an end of an outermost circle of the pole piece 33.

[0210] In this way, the insulating member 34 is arranged at both the starting end and the ending end of the pole piece 33, which is conducive to further reducing the risk of the burr or dust at the end of the pole piece 33 scratching the electrode assembly 32, and further conducive to improving the reliability of the battery monomer 30.

[0211] In some embodiments, as shown in FIG. 16, the non-adhesive area 34b is wound inside the pole piece 33 along the winding direction beyond the starting end.

[0212] The non-adhesive area 34b is wound inside the pole piece 33 beyond the starting end, so that the non-adhesive area 34b arranged in the winding manner has a higher structural strength, which is conducive to further improving the supporting effect of the non-adhesive area 34b on the electrode assembly 32, and further conducive to reducing the risk of the electrode assembly 32 collapsing or deforming inside.

[0213] In some embodiments, the non-adhesive area 34b is wound in n turns beyond the starting end, and 1≤n≤10.

[0214] Optionally, n can be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, etc.

[0215] It can be understood that the greater the value of n is, the more conducive to improving the supporting strength of the non-adhesive area 34b of the insulating member 34 on the electrode assembly 32, and the smaller the value of n is, the more conducive to reducing the space occupied by the insulating member 34, and the more conducive to improving the energy density of the battery monomer 30.

[0216] Therefore, the inventor has found through systematic analysis and long-term practice that setting 1≤n≤10 is conducive to improving the supporting strength of the non-adhesive area 34b on the electrode assembly 32 while reducing the space occupied by the non-adhesive area 34b inside the battery monomer 30, and further conducive to improving the energy density of the battery monomer 30.

[0217] In some embodiments, the electrode assembly 32 is in a winding shape, and the empty foil area 332 is connected to an end of the functional area 331 along a first direction X, which is perpendicular to the winding direction of the electrode assembly 32.

[0218] The electrode assembly 32 is in a winding shape, 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 tab 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 piece 34 can be arranged in a winding shape along the first end 331a, which is conducive to improving the supporting force of the insulating piece 34 on the electrode assembly 32 and reducing the risk of internal collapse of the electrode assembly 32.

[0219] 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.

[0220] The functional area 331 is in a laminated shape, and the plurality of tabs 33 are stacked, and the insulating piece 34 can also be stacked, which is conducive to improving the supporting force of the insulating piece 34 on the electrode assembly 32 and further improving the structural stability of the electrode assembly 32.

[0221] In some embodiments, the functional area 331 is in a laminated shape, and the functional area 331 has two second ends 331b in the second direction Y, and at least one second end 331b is connected to the empty foil area 332, and the second direction Y, the first direction X and the thickness direction O of the functional area 331 are perpendicular to each other.

[0222] The functional area 331 is in a laminated 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, and the first direction X is perpendicular to the leading direction of the tab 3321, and the insulating piece 34 is arranged at the first end 331a, and the insulating piece 34 can also be stacked, which is conducive to reducing the risk of the burr of the first end 331a of the functional area 331 piercing the diaphragm and improving the supporting force of the insulating piece on the electrode assembly 32.

[0223] In a second aspect, the battery 10 provided by the embodiments of the present application includes the battery monomer 30 provided by any of the above embodiments.

[0224] The battery 10 provided by the embodiments of the present application has the same technical effects as the battery monomer 30 provided by any of the above embodiments, and thus will not be described here.

[0225] In a third aspect, the power consuming device provided by the embodiments of the present application includes the battery monomer 30 or the battery 10 provided by any of the above embodiments, and the battery 10 is used to provide electric energy.

[0226] The power consuming device provided by the embodiments of the present application has the same technical effects as the battery monomer 30 or the battery 10 provided by any of the above embodiments, and thus will not be described here.

[0227] In some embodiments, as shown in FIGS. 4-16, the battery cell 30 provided by the present application includes a housing 31, an electrode assembly 32 accommodated in the housing 31, and a plurality of insulating members 34. The tab 33 of the electrode assembly 32 includes a functional region 331 coated with an active material layer and an empty foil region 332 not coated with the active material layer. The electrode assembly 32 is wound in a first direction X. The functional region 331 has two first end portions 331a at both ends in the first direction X. The first end portions 331a are a start end and an end end. The start end is located at an end of the innermost coil of the functional region 331 in the first direction X, and the end end is located at an end of the outermost coil of the functional region 331 in the first direction X. The plurality of insulating members 34 includes a first insulating member 341 and a second insulating member 342. The insulating member 34 includes a sticky region 34a and a non-sticky region 34b connected to the sticky region 34a. The sticky region 34a includes a first portion 341a and a second portion 342a located between the first portion 341a and the non-sticky region 34b. The second portion 342a protrudes from the first end portion 331a in 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 region 331 in a thickness direction O. 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-sticky region 34b is disposed to protrude from the first end portion 331a in the first direction X. The non-sticky region 34b of the first insulating member 341 and the non-sticky region 34b of the second insulating member 342 are in contact. The size a of the first portion 341a in the first direction X satisfies 1 mm≤a≤7 mm, and the size b of the non-sticky region 34b in the first direction X satisfies 3 mm≤b≤15 mm. The portion of the non-sticky region 34b protruding from the start end in the winding direction is wound n times inside the tab 33, and 1≤n≤10. The functional region 331 has two second end portions 331b in a second direction Y intersecting the first direction X. At least one second end portion 331b is connected to the empty foil region 332. In the second direction Y, the insulating member 34 protrudes from the second end portion 331b. The size of the insulating member 34 is greater than or equal to the size of the functional region 331. The empty foil region 332 is disposed to protrude from the insulating member 34 in the second direction Y. The size c of the insulating member 34 protruding from the functional region 331 in the second direction Y satisfies 0<c≤mm.

[0228] The battery monomer 30 provided by the embodiments of the present application has the non-adhesive area 34b of the insulation piece 34, and at least part of the non-adhesive area 34b protrudes from the first end 331a in the first direction X, which is beneficial to reduce the risk of burrs or other damages of the pole piece 33 or the diaphragm of the electrode assembly 32 of the first end 331a, and is beneficial to reduce the risk of unnecessary adhesive connection of the insulation piece 34 itself or the insulation piece 34 and other structures, reduce the risk of wrinkles of the insulation piece 34, and improve the smoothness of bubble discharge between the insulation piece 34 and the functional area 331, so as to improve the structural strength of the insulation piece 34, improve the support strength of the insulation piece 34 to the electrode assembly 32, and further improve the reliability of the battery monomer 30.

[0229] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0230] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, comprising: a housing; an electrode assembly accommodated in the housing, a tab of the electrode assembly including a functional region coated with an active material layer and a blank foil region not coated with the active material layer, the functional region having a first end portion in a first direction; and at least one insulating member including an adhesive region and a non-adhesive region connected to the adhesive region, at least a portion of the adhesive region being bonded to the functional region, and at least a portion of the non-adhesive region protruding beyond the first end portion in the first direction. The at least one insulating member includes two insulating members, the two insulating members including a first insulating member and a second insulating member, at least a portion of the adhesive region of the first insulating member and at least a portion of the adhesive region of the second insulating member being bonded to both sides of the functional region in a thickness direction of the functional region, respectively, and at least a portion of the non-adhesive region of the first insulating member and at least a portion of the non-adhesive region of the second insulating member protruding beyond the first end portion in the first direction. The adhesive region includes a first portion and a second portion, the second portion being located between the first portion and the non-adhesive region, and the second portion protruding beyond the first end portion in the first direction, the first portion of the first insulating member and the first portion of the second insulating member being bonded to both sides of the functional region in the thickness direction, respectively, and the second portion of the first insulating member and the second portion of the second insulating member being bonded to each other. The non-adhesive region of the first insulating member is in contact with the non-adhesive region of the second insulating member.

2. The battery cell of claim 1, wherein, A size a of the first portion in the first direction satisfies 1 mm ≤ a ≤ 7 mm.

3. The battery cell of claim 2, wherein, A size b of the non-adhesive region in the first direction satisfies 3 mm ≤ b ≤ 15 mm.

4. The battery cell of claim 2 or 3, wherein, The functional region has two first end portions in the first direction, and at least one insulating member is provided corresponding to each first end portion.

5. The battery cell of any one of claims 2 to 4, wherein, The electrode assembly includes at least one positive tab and at least one negative tab, the tab being the positive tab, and / or the tab being the negative tab.

6. The battery cell of any one of claims 1 to 5, wherein, The functional region has two second end portions in a second direction, at least one second end portion being connected to the blank foil region, the second direction intersecting the first direction.

7. The battery cell of any one of claims 1 to 6, wherein, In the second direction, the insulating member protrudes beyond at least one second end portion, and / or in the second direction, a size of the insulating member is greater than or equal to a size of the functional region.

8. The battery cell of any one of claims 1 to 7, wherein, The blank foil region is provided beyond the insulating member in the second direction.

9. The battery cell of any one of claims 1 to 8, wherein, A size c of the insulating member beyond the functional region in the second direction satisfies 0 < c ≤ 30 mm.

10. The battery cell of claim 9, wherein, 0 < c ≤ 5 mm.

11. The battery cell of claim 10, wherein, The blank foil region is connected to an end portion of the functional region in the first direction.

12. The battery cell of claim 10 or 11, wherein, The blank foil region includes a plurality of tabs spaced apart, the first end portion includes a tab lead-out portion and a non-tab lead-out portion, the tabs are led out only by the tab lead-out portion, and the insulating member covers at least a portion of the non-tab lead-out portion.

13. The battery cell of claim 12, wherein, The functional region has two third end portions in a third direction, the third direction intersecting the first direction.

14. The battery cell of any one of claims 1 to 8, wherein, ​ 15. The battery cell of claim 14, wherein, ​ 16. The battery cell of claim 14 or 15, wherein, ​ The insulating member extends beyond at least one of the third end portions in the third direction; and / or, the insulating member has a dimension in the third direction that is greater than or equal to a dimension of the functional region.

17. The battery cell of any one of claims 1 to 16, wherein, The functional region is in a wound shape, the first direction is a winding direction, the first end portion is a start end portion, and the start end portion is located at an end portion of an innermost winding of the functional region in the winding direction; and / or, the first end portion is an end end portion, and the end end portion is located at an end portion of an outermost winding of the functional region in the winding direction.

18. The battery cell of claim 17, wherein, The non-adhesive region is wound inside the pole piece in a portion beyond the start end portion in the winding direction.

19. The battery cell of claim 18, wherein, The non-adhesive region is wound in n windings, 1≤n≤10, in a portion beyond the start end portion.

20. The battery cell of any one of claims 1 to 16, wherein, The electrode assembly is in a wound shape, and the empty foil region is connected to an end portion of the functional region in the first direction, the first direction being perpendicular to a winding direction of the electrode assembly.

21. The battery cell of any one of claims 1 to 16, wherein, The functional region is in a stacked shape, and the empty foil region is connected to an end portion of the functional region in the first direction.

22. The battery cell of any one of claims 1 to 16, wherein, The functional region is in a stacked shape, and the functional region has two second end portions in a second direction, at least one of the second end portions being connected to the empty foil region, the second direction, the first direction, and a thickness direction of the functional region being perpendicular to each other.

23. A battery comprising the battery cell of any one of claims 1 to 22.

24. An electric device comprising the battery of claim 23, the battery being configured to provide electric energy.

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