Adhesive tape, battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides gummed paper, a battery monomer, a battery and electric equipment. The gummed paper comprises a base material and a glue layer. The base material is provided with a first surface and a second surface which are opposite in the thickness direction, the base material is provided with a first side face in the first direction, the first side face is connected with the first surface and the second surface, and the first direction is perpendicular to the thickness direction of the base material. The adhesive layer is arranged on the first surface. Wherein the first surface comprises a gluing area coated with a glue layer and a first blank area not coated with a glue layer, and the first blank area is connected with the gluing area and the first side face. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

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

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

[0003] In the development of battery technology, how to improve the reliability of battery cells is a technical problem that needs to be solved urgently. Utility Model Content

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

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides an adhesive tape. The adhesive tape includes a substrate and an adhesive layer. The substrate has a first surface and a second surface opposite to each other in the thickness direction thereof, the substrate has a first side surface in the first direction, the first side surface connects the first surface and the second surface, and the first direction is perpendicular to the thickness direction of the substrate. The adhesive layer is disposed on the first surface. The first surface includes an adhesive coating area coated with the adhesive layer and a first blank area not coated with the adhesive layer, and the first blank area connects the adhesive coating area and the first side surface.

[0007] According to the technical solution of the embodiment of the present application, the first surface of the substrate includes a glue-coated area and a first blank area, the glue layer is coated on the glue-coated area, and the first blank area connects the glue-coated area and the first side surface, thereby reducing the probability of the glue layer overflowing from the first surface from the first side surface, reducing the risk of adhesive tape being attached to the electrode piece, and the risk of the adhesive layer overflowing and thus adhering to the diaphragm, causing the electrode assembly to precipitate metal ions, and improving the reliability of the battery cell.

[0008] In some embodiments, the substrate further includes a second side surface, and in the first direction, the second side surface is arranged opposite to the first side surface. The first surface further includes a second blank area not coated with the adhesive layer, and along the first direction, the adhesive coating area is located between the first blank area and the second blank area, and the second blank area connects the adhesive coating area and the second side surface.

[0009] According to the technical solution of the embodiment of the present application, the second blank area connects the glue coating area and the second side surface, thereby reducing the probability of the glue layer overflowing from the first surface to the second side surface, reducing the risk of metal ion precipitation in the electrode assembly due to glue overflow when the adhesive tape is affixed to the electrode piece, and improving the reliability of the battery cell.

[0010] In some embodiments, in the first direction, the width of the first blank area is L 1 , meet the conditions: 0.5mm≤L 1 ≤2mm.

[0011] According to the technical solution of the embodiment of the present application, the width of the first blank area meets the above conditions, the process is easy to implement, and the probability of folding of the first blank area of ​​the substrate is reduced, thereby reducing the risk of folding of the first blank area when the adhesive tape is attached to the electrode piece, thereby increasing the stress of the diaphragm and causing the precipitation of metal ions in the electrode assembly, thereby improving the reliability of the battery cell.

[0012] In some embodiments, 0.8 mm ≤ L 1 ≤1.2mm.

[0013] In the technical solution of the embodiment of the present application, the width of the first blank area meets the above conditions, further reducing the process difficulty and improving the reliability of the battery cell.

[0014] In some embodiments, in the first direction, the width of the second blank area is L 2 , meet the conditions: 0.5mm≤L 2 ≤2mm.

[0015] According to the technical solution of the embodiment of the present application, the width of the second blank area meets the above conditions, the process is easy to implement, and the probability of folding of the second blank area of ​​the substrate is reduced, thereby improving the reliability of the battery cell.

[0016] In some embodiments, 0.8 mm ≤ L 2 ≤1.2mm.

[0017] In the technical solution of the embodiment of the present application, the width of the second blank area meets the above conditions, further reducing the process difficulty and improving the reliability of the battery cell.

[0018] In a second aspect, the present application provides an adhesive tape. The adhesive tape includes a substrate and an adhesive layer. The substrate has a first surface and a second surface relative to each other in the thickness direction thereof, the substrate has a first side surface in the first direction, the first side surface connects the first surface and the second surface, and the first direction is perpendicular to the thickness direction of the substrate. The adhesive layer is disposed on the first surface. The adhesive layer includes a main body portion and a first edge portion, and along the first direction, the first edge portion is closer to the first side surface than the main body portion. In the thickness direction of the substrate, the thickness of the first edge portion is less than the thickness of the main body portion.

[0019] According to the technical solution of the embodiment of the present application, the first edge portion is closer to the first side surface than the main body portion, and the thickness of the first edge portion is less than the thickness of the main body portion, thereby reducing the probability of the adhesive layer overflowing from the first surface from the first side surface, reducing the risk of the adhesive tape being attached to the pole piece and the diaphragm being adhered due to the overflow of the adhesive layer, thereby causing the electrode assembly to precipitate metal ions, and improving the reliability of the battery cell.

[0020] In some embodiments, the substrate further includes a second side surface, and in the first direction, the second side surface is arranged opposite to the first side surface. The adhesive layer further includes a second edge portion, and along the first direction, the second edge portion is closer to the second side surface than the main body portion, and the main body portion is located between the first edge portion and the second edge portion. In the thickness direction of the substrate, the thickness of the second edge portion is less than the thickness of the main body portion.

[0021] According to the technical solution of the embodiment of the present application, the second edge portion is closer to the second side surface than the main body portion, and the thickness of the second edge portion is less than the thickness of the main body portion, thereby reducing the probability of the adhesive layer overflowing from the first surface from the second side surface, reducing the risk of metal ion precipitation in the electrode assembly due to the adhesive tape being attached to the pole piece, and improving the reliability of the battery cell.

[0022] In some embodiments, in the first direction, the width of the first edge portion is L 3 , meet the conditions: 0.5mm≤L 3 ≤2mm.

[0023] According to the technical solution of the embodiment of the present application, the width of the first edge portion satisfies the above conditions, and the process is easy to implement. At the same time, the probability of folding of the area corresponding to the first edge portion of the substrate is reduced, and the risk of folding of the substrate when the tape is attached to the electrode piece, thereby increasing the stress of the diaphragm and causing the precipitation of metal ions in the electrode assembly, is reduced, thereby improving the reliability of the battery cell.

[0024] In some embodiments, in the first direction, the width of the second edge portion is L 4 , meet the conditions: 0.5mm≤L 4 ≤2mm.

[0025] According to the technical solution of the embodiment of the present application, the width of the second edge portion meets the above conditions, and the process is easy to implement. At the same time, the probability of folding of the area corresponding to the second edge portion of the substrate is reduced, and the risk of folding of the substrate when the tape is attached to the electrode piece, thereby increasing the stress of the diaphragm and causing the precipitation of metal ions in the electrode assembly, is reduced, thereby improving the reliability of the battery cell.

[0026] In a third aspect, the present application provides a battery cell. The battery cell includes an electrode assembly, and the electrode assembly is a wound structure. The electrode assembly includes a first pole piece, a second pole piece, and a diaphragm, the first pole piece and the second pole piece have opposite polarities, and the diaphragm is arranged between the first pole piece and the second pole piece. Among them, at least one bending section of the first pole piece is affixed with a tape as in any embodiment of the first aspect or a tape as in any embodiment of the second aspect, and the first direction is the winding direction of the electrode assembly.

[0027] According to the technical solution of the embodiment of the present application, adhesive tape is affixed to the bent section of the first pole piece to reduce the risk of material falling off the surface of the first pole piece when the electrode assembly is formed, thereby causing metal ions to precipitate from the electrode assembly. At the same time, the adhesive tape reduces the risk of adhesive layer overflowing and thereby sticking to the diaphragm, causing metal ions to precipitate from the electrode assembly, thereby improving the reliability of the battery cell.

[0028] In some embodiments, adhesive tape is attached to both sides of at least one bending segment in the thickness direction.

[0029] According to the technical solution of the embodiment of the present application, adhesive tape is affixed on both sides of the bending section in the thickness direction, so that the two sides of the bending section have better consistency, reducing the risk of breakage of the first pole piece, and at the same time reducing the risk of surface material falling off on both sides of the bending section, thereby improving the reliability of the battery cell.

[0030] In some embodiments, adhesive tape is attached to the innermost bending section of the first pole piece.

[0031] According to the technical solution of the embodiment of the present application, the innermost bending section of the first pole piece is affixed with adhesive tape, thereby reducing the risk of metal ion precipitation in the innermost bending section of the first pole piece and improving the reliability of the battery cell.

[0032] In some embodiments, the first pole piece is a positive pole piece.

[0033] In the technical solution of the embodiment of the present application, adhesive tape is affixed to the positive electrode sheet to reduce the risk of material falling off the surface of the first electrode sheet, thereby causing metal ions to precipitate from the second electrode sheet, thereby improving the reliability of the battery cell.

[0034] In a fourth aspect, the present application provides a battery, comprising a battery cell as in any one of the embodiments in the third aspect.

[0035] In a fifth aspect, the present application further provides an electrical device, comprising a battery cell as in any embodiment of the third aspect or a battery as in any embodiment of the fourth aspect, wherein the battery cell or the battery is used to provide electrical energy.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0040] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0041] Figure 4 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0042] Figure 5 A schematic diagram of the structure of adhesive tape provided in some embodiments of the present application;

[0043] Figure 6 for Figure 4 A schematic diagram of another perspective of the adhesive tape in FIG.

[0044] Figure 7 A schematic diagram of the structure of adhesive tape provided in other embodiments of the present application;

[0045] Figure 8 for Figure 7 A schematic diagram of another perspective of the adhesive tape in FIG.

[0046] Fig. 9 A partial schematic diagram of an expanded electrode assembly provided in some embodiments of the present application;

[0047] Fig.10 A partial schematic diagram of an expanded electrode assembly provided for some other embodiments of the present application.

[0048] Icons: 1-adhesive tape; 10-substrate; 11-first surface; 111-glue coating area; 112-first blank area; 113-second blank area; 12-second surface; 13-first side; 14-second side; 20-glue layer; 21-main body; 22-first edge; 23-second edge; 100-battery cell; 110-electrode assembly; 1101-first pole piece; 11011-bending section; 1102-second pole piece; 1103-diaphragm; 120-casing; 130-housing; 140-end cover; 150-electrode terminal; 200-battery; 210-box; 220-first sub-box; 230-second sub-box; 1000-vehicle; 1100-controller; 1200-motor; X-first direction; Y-thickness direction of substrate. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0051] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0054] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0055] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0056] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0057] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0058] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0059] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0060] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0061] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square case battery cell.

[0062] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0063] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0064] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0065] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0067] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0068] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0069] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0070] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the separator is a membrane. The present application has no particular limitation on the type of the membrane, and any known porous membrane with good chemical stability and mechanical stability can be selected.

[0072] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0073] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0074] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0075] At present, from the perspective of market development, batteries have been widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as electric tools, drones, energy storage equipment, etc. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0076] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or internal conditions of the battery change, the reliability of the battery cell is also one of the key factors to consider.

[0077] At present, in a wound electrode assembly, the positive electrode sheet and the negative electrode sheet are arranged opposite to each other, and the electrode assembly is formed by winding, and the positive electrode sheet and the negative electrode sheet are separated by a diaphragm. In the process of forming the electrode assembly, the active material on the surface of the positive electrode sheet may fall off, thereby hindering the transfer of metal ions from the positive electrode sheet to the negative electrode sheet, thereby causing metal ion precipitation in the negative electrode sheet, which may reduce the charge and discharge performance of the battery, shorten the life, or cause other safety hazards.

[0078] In order to reduce the risk of active materials falling off the surface of the positive electrode sheet, adhesive tape is usually applied to the surface of the positive electrode sheet, especially the bent section of the positive electrode sheet with greater stress. However, in the process of forming the electrode assembly, the adhesive layer of the adhesive tape may overflow from the edge of the adhesive tape due to extrusion, and the overflowing adhesive layer may adhere to the diaphragm, thereby affecting the passage of metal ions, causing metal precipitation from the negative electrode sheet, and affecting the reliability of the battery cell.

[0079] In order to reduce the risk of adhesive layer overflow of adhesive tape affecting the reliability of battery cells, the present application provides an adhesive tape. The adhesive tape includes a substrate and an adhesive layer. The substrate has a first surface and a second surface opposite to each other in the thickness direction thereof, and the substrate has a first side surface in the first direction, the first side surface connects the first surface and the second surface, and the first direction is perpendicular to the thickness direction of the substrate. The adhesive layer is arranged on the first surface.

[0080] The first surface includes a glue-coated area coated with a glue layer and a first blank area not coated with a glue layer, and the first blank area connects the glue-coated area and the first side surface.

[0081] Alternatively, the adhesive layer includes a main body and a first edge portion, and along the first direction, the first edge portion is closer to the first side surface than the main body. In the thickness direction of the substrate, the thickness of the first edge portion is less than the thickness of the main body.

[0082] By connecting the glue coating area and the first side surface through the first blank area, or by setting the first edge portion closer to the first side surface than the main body portion, the probability of the glue layer overflowing from the first surface from the first side surface is reduced, and the risk of the glue tape being attached to the electrode piece and the diaphragm being adhered due to the overflow of the glue layer, which causes the precipitation of metal ions from the electrode assembly, is reduced, thereby improving the reliability of the battery cell.

[0083] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0084] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0085] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0086] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 200 is provided inside the vehicle 1000, and the battery 200 may be provided at the bottom, head or tail of the vehicle 1000. The battery 200 may be used to power the vehicle 1000, for example, the battery 200 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0087] The vehicle 1000 may further include a controller 1100 and a motor 1200 , wherein the controller 1100 is used to control the battery 200 to supply power to the motor 1200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0088] In some embodiments of the present application, the battery 200 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0089] Please refer to Figure 2 , Figure 2An exploded view of a battery provided in some embodiments of the present application. The battery 200 may further include a housing 210, in which the battery cell 100 is accommodated. The housing 210 is used to provide a storage space for the battery cell 100, and the housing 210 may adopt a variety of structures. In some embodiments, the housing 210 may include a first sub-housing 220 and a second sub-housing 230, the first sub-housing 220 and the second sub-housing 230 cover each other, and the first sub-housing 220 and the second sub-housing 230 jointly define a storage space for accommodating the battery cell 100. The second sub-box 230 may be a hollow structure with one end open, and the first sub-box 220 may be a plate-like structure. The first sub-box 220 covers the open side of the second sub-box 230 so that the first sub-box 220 and the second sub-box 230 jointly define a storage space; the first sub-box 220 and the second sub-box 230 may also be hollow structures both with one side open, and the open side of the first sub-box 220 covers the open side of the second sub-box 230.

[0090] In the battery 200, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is accommodated in the box 210; of course, the battery 200 may also be a battery 200 module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery 200 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 210. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0091] The battery cell 100 may be a secondary battery or a primary battery; the battery cell 100 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0092] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 100 includes a housing 120, an electrode assembly 110 and an electrode terminal 150. The housing 120 includes a shell 130 and an end cap 140. The shell 130 has an opening, and the end cap 140 closes the opening to isolate the internal environment of the battery cell 100 from the external environment.

[0093] The housing 130 is a component used to cooperate with the end cap 140 to form an internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 110, the electrolyte and other components. The housing 130 and the end cap 140 can be independent components. The housing 130 can be of various shapes and sizes. Specifically, the shape of the housing 130 can be determined according to the specific shape and size of the electrode assembly 110. The material of the housing 130 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0094] The end cap 140 refers to a component that covers the opening of the shell 130 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 140 can be adapted to the shape of the shell 130 to match the shell 130. Optionally, the end cap 140 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 140 is not easily deformed when squeezed and collided, so that the battery cell 100 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 140. The electrode terminal can be used to electrically connect to the electrode assembly 110 for outputting or inputting electrical energy of the battery cell 100. The material of the end cap 140 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 140 to isolate the electrical connection components in the housing 130 from the end cap 140 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0095] Please refer to Figure 4 , Figure 4A schematic diagram of the structure of an electrode assembly provided for some embodiments of the present application. As shown in the figure, the electrode assembly 110 is a component in the battery cell 100 where an electrochemical reaction occurs. One or more electrode assemblies 110 may be included in the housing 130. The electrode assembly 110 is mainly formed by winding a first pole piece 1101 and a second pole piece 1102, and a diaphragm 1103 is usually provided between the first pole piece 1101 and the second pole piece 1102, and the diaphragm 1103 is used to separate the first pole piece 1101 and the second pole piece 1102 to reduce the risk of short circuit between the first pole piece 1101 and the second pole piece 1102. The parts of the first pole piece 1101 and the second pole piece 1102 with active materials constitute the main body of the electrode assembly 110, and the parts of the first pole piece 1101 and the second pole piece 1102 without active materials each constitute a pole ear. Among them, the first pole piece 1101 can be a positive pole piece, and the second pole piece 1102 can be a negative pole piece. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at both ends of the main body. During the charge and discharge process of the battery 200, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0096] Please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the adhesive tape provided in some embodiments of the present application. Figure 6 for Figure 4 Schematic diagram of another perspective of the adhesive tape in FIG. Figure 5 The dotted line in the figure shows the boundary of the glue layer. Figure 6 The boundaries of the first blank area, the glued area, and the second blank area are shown by dotted lines. An embodiment of the present application provides an adhesive tape 1. The adhesive tape 1 includes a substrate 10 and an adhesive layer 20. The substrate 10 has a first surface 11 and a second surface 12 relative to each other in its thickness direction Y, and the substrate 10 has a first side surface 13 in a first direction X, the first side surface 13 connects the first surface 11 and the second surface 12, and the first direction X is perpendicular to the thickness direction Y of the substrate 10. The adhesive layer 20 is arranged on the first surface 11. Among them, the first surface 11 includes a glued area 111 coated with the adhesive layer 20 and a first blank area 112 not coated with the adhesive layer 20, and the first blank area 112 connects the glued area 111 and the first side surface 13.

[0097] In some embodiments, the material of the substrate 10 can be a polymer base film such as PP (Polypropylene), PE (Polyethylene), BOPP (Biaxially Oriented Polypropylene), PET (Polyetherimide), or PI (Polyimide).

[0098] In some embodiments, the substrate 10 may be a material that allows metal ions to pass through, or a material that does not allow metal ions to pass through.

[0099] In some embodiments, the material of the adhesive layer 20 can be special glue for bonding polypropylene materials, acrylic glue, etc.

[0100] In some embodiments, the adhesive tape 1 may be in a rolled structure during storage. After the adhesive layer 20 is coated on the first surface 11 of the substrate 10, the adhesive tape 1 may be rolled up for storage, and the first surface 11 may be the surface of the adhesive tape 1 facing the center of the roll.

[0101] In some embodiments, in the thickness direction Y of the substrate 10 , one end of the first side surface 13 may be connected to the first surface 11 , and the other end may be connected to the second surface 12 .

[0102] In some embodiments, the first surface 11 may include a glued area 111 and a first blank area 112. In the first direction X, one end of the first blank area 112 may be connected to the first side surface 13, and the other end of the first blank area 112 may be connected to an end of the glued area 111 close to the first side surface 13.

[0103] In some embodiments, the first blank area 112 and the glue-coated area 111 may be pre-divided on the substrate 10. When applying glue, the glue layer 20 is applied according to the boundary between the first blank area 112 and the glue-coated area 111.

[0104] In some embodiments, the first blank area 112 and the glue-coated area 111 may not be pre-divided on the substrate 10. According to the size of the glue layer 20, after coating, the first blank area 112 and the glue-coated area 111 are divided according to the boundary of the glue layer 20.

[0105] In some embodiments, the first direction may be represented by the direction indicated by the letter X in the figure. The thickness direction of the substrate 10 may be represented by the direction indicated by the letter Y in the figure.

[0106] According to the technical solution of the embodiment of the present application, the first surface 11 of the substrate 10 includes a glue-coated area 111 and a first blank area 112, the glue layer 20 is coated on the glue-coated area 111, and the first blank area 112 connects the glue-coated area 111 and the first side surface 13, thereby reducing the probability of the glue layer 20 overflowing from the first surface 11 from the first side surface 13, reducing the risk of the adhesive tape 1 being attached to the electrode piece, and the risk of the adhesive layer 20 overflowing and thus adhering to the diaphragm 1103, causing the electrode assembly 110 to precipitate metal ions, thereby improving the reliability of the battery cell 100.

[0107] Please refer to Figure 5 and Figure 6In some embodiments, the substrate 10 further includes a second side surface 14. In the first direction X, the second side surface 14 is disposed opposite to the first side surface 13. The first surface 11 further includes a second blank area 113 not coated with the adhesive layer 20. Along the first direction X, the adhesive coating area 111 is located between the first blank area 112 and the second blank area 113. The second blank area 113 connects the adhesive coating area 111 and the second side surface 14.

[0108] In some embodiments, the second side surface 14 is disposed opposite to the first side surface 13 in the first direction X. In the thickness direction Y of the substrate 10 , one end of the second side surface 14 is connected to an end of the first surface 11 away from the first side surface 13 , and the other end of the second side surface 14 is connected to an end of the second surface 12 away from the second side surface 14 .

[0109] Along the first direction X, one end of the first blank area 112 is connected to the first side surface 13 , the other end of the first blank area 112 is connected to one end of the glued area 111 , the other end of the glued area 111 is connected to one end of the second blank area 113 , and the other end of the second blank area 113 is connected to the second side surface 14 .

[0110] In some embodiments, the second blank area 113 and the glue-coated area 111 may be pre-divided on the substrate 10. When applying glue, the glue layer 20 is applied according to the boundary between the second blank area 113 and the glue-coated area 111.

[0111] In some embodiments, the second blank area 113 and the glue-coated area 111 may not be pre-divided on the substrate 10. According to the size of the glue layer 20, after coating, the second blank area 113 and the glue-coated area 111 are divided according to the boundary of the glue layer 20.

[0112] According to the technical solution of the embodiment of the present application, the second blank area 113 connects the glue-coated area 111 and the second side surface 14, thereby reducing the probability of the glue layer 20 overflowing from the first surface 11 from the second side surface 14, and reducing the risk of metal ions precipitating from the electrode assembly 110 due to glue overflow of the glue tape 1 when the glue tape 1 is attached to the electrode piece, thereby improving the reliability of the battery cell 100.

[0113] Please refer to Figure 5 and Figure 6 In some embodiments, in the first direction X, the width of the first blank area 112 is L 1 , meet the conditions: 0.5mm≤L 1 ≤2mm.

[0114] In some embodiments, in the first direction X, the width L of the first blank area 112 is 1 If the above conditions are met, L 1It can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0115] In some embodiments, the width L of the first blank area 112 is 1 The measurement method may be to align one end of a measuring ruler with the first side surface 13 and measure the distance from the first side surface 13 to the glue coating area 111 with the other end.

[0116] In some embodiments, the end of the first blank area 112 away from the first side surface 13 may be a straight line or an irregular edge line.

[0117] According to the technical solution of the embodiment of the present application, the width of the first blank area 112 meets the above conditions. The process is easy to implement and the probability of folding of the first blank area 112 of the substrate 10 is reduced. The risk of folding of the first blank area 112 when the adhesive tape 1 is attached to the electrode sheet, thereby increasing the stress of the diaphragm 1103 and causing the precipitation of metal ions from the electrode assembly 110, is reduced, thereby improving the reliability of the battery cell 100.

[0118] Please refer to Figure 5 and Figure 6 , in some embodiments, 0.8 mm ≤ L 1 ≤1.2mm.

[0119] In some embodiments, in the first direction X, the width L of the first blank area 112 is 1 If the above conditions are met, L 1 It can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0120] In the technical solution of the embodiment of the present application, the width of the first blank area 112 meets the above conditions, further reducing the process difficulty and improving the reliability of the battery cell 100.

[0121] Please refer to Figure 5 and Figure 6 In some embodiments, in the first direction X, the width of the second blank area 113 is L 2 , meet the conditions: 0.5mm≤L 2 ≤2mm.

[0122] In some embodiments, in the first direction X, the width L of the second blank area 113 is 2 If the above conditions are met, L 2 It can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0123] In some embodiments, the width L of the second blank area 113 is2 The measurement method may be to align one end of a measuring ruler with the second side surface 14 and measure the distance from the second side surface 14 to the glue coating area 111 with the other end.

[0124] In some embodiments, the end of the second blank area 113 away from the second side surface 14 may be a straight line or an irregular edge line.

[0125] In some embodiments, in the first direction X, the width L of the first blank area 112 is 1 The width L of the second blank area 113 may be 2 same.

[0126] In some embodiments, in the first direction X, the width L of the first blank area 112 is 1 The width L of the second blank area 113 may be 2 different.

[0127] According to the technical solution of the embodiment of the present application, the width of the second blank area 113 meets the above conditions, the process is easy to implement, and the probability of folding of the second blank area 113 of the substrate 10 is reduced, thereby improving the reliability of the battery cell 100.

[0128] Please refer to Figure 5 and Figure 6 , in some embodiments, 0.8 mm ≤ L 2 ≤1.2mm.

[0129] In some embodiments, in the first direction X, the width L of the second blank area 113 is 2 If the above conditions are met, L 2 It can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0130] In the technical solution of the embodiment of the present application, the width of the second blank area 113 meets the above conditions, further reducing the process difficulty and improving the reliability of the battery cell 100.

[0131] Please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of adhesive tape provided in some other embodiments of the present application. Figure 8 for Figure 7 Schematic diagram of another perspective of the adhesive tape in FIG. Figure 7The adhesive layer in the figure completely blocks the substrate, so only the structure of the adhesive layer is shown, where the boundaries of the first edge portion, the main body portion and the second edge portion are represented by dotted lines. The embodiment of the present application also provides an adhesive tape 1. The adhesive tape 1 includes a substrate 10 and an adhesive layer 20. The substrate 10 has a first surface 11 and a second surface 12 opposite to each other in its thickness direction Y, and the substrate 10 has a first side surface 13 in a first direction X, and the first side surface 13 connects the first surface 11 and the second surface 12, and the first direction X is perpendicular to the thickness direction Y of the substrate 10. The adhesive layer 20 is arranged on the first surface 11. Among them, the adhesive layer 20 includes a main body portion 21 and a first edge portion 22, and along the first direction X, the first edge portion 22 is closer to the first side surface 13 than the main body portion 21. In the thickness direction Y of the substrate 10, the thickness of the first edge portion 22 is less than the thickness of the main body portion 21.

[0132] In some embodiments, the adhesive layer 20 may include a main body 21 and a first edge portion 22. In the first direction X, the first edge portion 22 is closer to the first side surface 13 than the main body 21, and an end of the first edge portion 22 away from the first side surface 13 may be connected to an end of the main body 21 close to the first side surface 13.

[0133] In some embodiments, in the first direction X, an end of the first edge portion 22 away from the main body portion 21 may intersect with the first side surface 13 , and the intersection may be a complete intersection or a partial intersection.

[0134] In some embodiments, an end of the first edge portion 22 away from the main body portion 21 may not intersect with the first side surface 13 .

[0135] In some embodiments, in the first direction X, the thickness of each region of the first edge portion 22 may be the same.

[0136] In some embodiments, the various regions of the first edge portion 22 may also be different in the first direction X. The thickness of the first edge portion 22 may vary regularly, such as linearly or curvilinearly, or may vary irregularly.

[0137] In some embodiments, in the first direction X, a thickness of a portion of the first edge portion 22 close to the first side surface 13 may be smaller than a thickness of a portion of the first edge portion 22 far from the first side surface 13 .

[0138] According to the technical solution of the embodiment of the present application, the first edge portion 22 is closer to the first side surface 13 than the main body portion 21, and the thickness of the first edge portion 22 is less than the thickness of the main body portion 21, thereby reducing the probability of the adhesive layer 20 overflowing from the first surface 11 from the first side surface 13, reducing the risk of the adhesive tape 1 being attached to the electrode piece and the adhesive layer 20 overflowing and thus adhering to the diaphragm 1103, thereby causing the electrode assembly 110 to precipitate metal ions, thereby improving the reliability of the battery cell 100.

[0139] Please refer to Figure 7 and Figure 8 In some embodiments, the substrate 10 further includes a second side surface 14, which is disposed opposite to the first side surface 13 in the first direction X. The adhesive layer 20 further includes a second edge portion 23, which is closer to the second side surface 14 than the main body portion 21 along the first direction X, and the main body portion 21 is located between the first edge portion 22 and the second edge portion 23. In the thickness direction Y of the substrate 10, the thickness of the second edge portion 23 is less than the thickness of the main body portion 21.

[0140] In some embodiments, in the first direction X, the second edge portion 23 is closer to the second side surface 14 than the main body 21 , and an end of the second edge portion 23 away from the second side surface 14 can be connected to an end of the main body 21 close to the second side surface 14 .

[0141] In some embodiments, in the first direction X, an end of the second edge portion 23 away from the main body portion 21 may intersect with the second side surface 14 , and the intersection may be a complete intersection or a partial intersection.

[0142] In some embodiments, an end of the second edge portion 23 away from the main body portion 21 may not intersect with the second side surface 14 .

[0143] In some embodiments, in the first direction X, the thicknesses of various regions of the second edge portion 23 may be the same.

[0144] In some embodiments, the regions of the second edge portion 23 may be different in the first direction X. The thickness of the second edge portion 23 may vary regularly, such as linearly or curvilinearly, or may vary irregularly.

[0145] In some embodiments, in the first direction X, the thickness of a portion of the second edge portion 23 close to the second side surface 14 may be smaller than the thickness of a portion of the second edge portion 23 away from the second side surface 14 .

[0146] In some embodiments, along the first direction X, one end of the first edge portion 22 away from the first side surface 13 is connected to one end of the main body 21 , and the other end of the main body 21 is connected to one end of the second edge portion 23 away from the second side surface 14 .

[0147] In some embodiments, the boundary line between the first edge portion 22 and the main body 21 may be a straight line or an irregular line segment. The boundary line between the second edge portion 23 and the main body may be a straight line or an irregular line segment.

[0148] In some embodiments, in the thickness direction Y of the substrate 10 , the thickness of the first edge portion 22 may be the same as the thickness of the second edge portion 23 .

[0149] In some embodiments, in the thickness direction Y of the substrate 10 , the thickness of the first edge portion 22 may be different from the thickness of the second edge portion 23 .

[0150] According to the technical solution of the embodiment of the present application, the second edge portion 23 is closer to the second side surface 14 than the main body portion 21, and the thickness of the second edge portion 23 is less than the thickness of the main body portion 21, thereby reducing the probability of the adhesive layer 20 overflowing from the first surface 11 from the second side surface 14, reducing the risk of metal ions precipitating from the electrode assembly 110 due to the adhesive tape 1 being attached to the electrode sheet, and improving the reliability of the battery cell 100.

[0151] Please refer to Figure 7 and Figure 8 In some embodiments, in the first direction X, the width of the first edge portion 22 is L 3 , meet the conditions: 0.5mm≤L 3 ≤2mm.

[0152] In some embodiments, in the first direction X, the width L of the first edge portion 22 is 3 If the above conditions are met, L 3 It can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0153] In the technical solution of the embodiment of the present application, the width of the first edge portion 22 meets the above conditions. The process is easy to implement, while reducing the probability of folding of the area corresponding to the first edge portion 22 of the substrate 10, thereby reducing the risk of folding of the substrate 10 when the adhesive tape 1 is attached to the electrode piece, thereby increasing the stress of the diaphragm 1103 and causing the electrode assembly 110 to precipitate metal ions, thereby improving the reliability of the battery cell 100.

[0154] In some embodiments, in the first direction X, the width of the first edge portion 22 is L 3 , meet the conditions: 0.8mm≤L 3 ≤1.2mm.

[0155] In some embodiments, in the first direction X, the width L of the first edge portion 22 is 3 If the above conditions are met, L 3 It can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0156] In the technical solution of the embodiment of the present application, the width of the first edge portion 22 satisfies the above conditions, which further makes the process easy to implement. At the same time, it reduces the risk of the substrate 10 being folded when the adhesive tape 1 is attached to the electrode piece, thereby increasing the stress of the diaphragm 1103 and causing the electrode assembly 110 to precipitate metal ions, thereby improving the reliability of the battery cell 100.

[0157] Please refer to Figure 7 and Figure 8 In some embodiments, in the first direction X, the width of the second edge portion 23 is L 4 , meet the conditions: 0.5mm≤L 4 ≤2mm.

[0158] In some embodiments, in the first direction X, the width L of the second edge portion 23 is 4 If the above conditions are met, L 3 It can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0159] According to the technical solution of the embodiment of the present application, the width of the second edge portion 23 satisfies the above conditions, and the process is easy to implement. At the same time, the probability of folding of the area corresponding to the second edge portion 23 of the substrate 10 is reduced, and the risk of folding of the substrate 10 when the adhesive tape 1 is attached to the electrode sheet, thereby increasing the stress of the diaphragm 1103 and causing the electrode assembly 110 to precipitate metal ions, is reduced, thereby improving the reliability of the battery cell 100.

[0160] In some embodiments, in the first direction X, the width of the second edge portion 23 is L 4 , meet the conditions: 0.8mm≤L 4 ≤1.2mm.

[0161] In some embodiments, in the first direction X, the width L of the second edge portion 23 is 4 If the above conditions are met, L 4 It can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0162] In the technical solution of the embodiment of the present application, the width of the second edge portion 23 satisfies the above conditions, further facilitating the process to be implemented, while reducing the risk of the substrate 10 being folded when the adhesive tape 1 is attached to the electrode piece, thereby increasing the stress of the diaphragm 1103 and causing the electrode assembly 110 to precipitate metal ions, thereby improving the reliability of the battery cell 100.

[0163] Please refer to Fig. 9 and Fig.10 , Fig. 9 A partial schematic diagram of an expanded electrode assembly provided in some embodiments of the present application, Fig.10This is a partial schematic diagram of an electrode assembly provided in some other embodiments of the present application. Fig. 9 The adhesive tape in Figure 5 and Figure 6 An embodiment of the adhesive tape, Fig.10 The adhesive tape in Figure 7 and Figure 8 The embodiment of the present application also provides a battery cell 100. The battery cell 100 includes an electrode assembly 110, and the electrode assembly 110 is a wound structure. The electrode assembly 110 includes a first pole piece 1101, a second pole piece 1102 and a diaphragm 1103, the first pole piece 1101 and the second pole piece 1102 have opposite polarities, and the diaphragm 1103 is arranged between the first pole piece 1101 and the second pole piece 1102. Among them, the adhesive tape 1 of any of the above embodiments is affixed to at least one bending section 11011 of the first pole piece 1101, and the first direction X is the winding direction of the electrode assembly 110.

[0164] In some embodiments, the electrode assembly 110 is unrolled along a winding direction, and the first direction X coincides with the winding direction.

[0165] In some embodiments, all the bent sections 11011 of the first pole piece 1101 may be affixed with adhesive tape 1 .

[0166] In some embodiments, a portion of the bent section 11011 of the first pole piece 1101 may be affixed with adhesive tape 1 .

[0167] In some embodiments, the adhesive tape 1 is attached to the first electrode 1101 by placing the first surface 11 of the substrate 10 facing the surface of the first electrode 1101 and attaching the adhesive layer 20 to the first electrode 1101. After the adhesive tape 1 is attached to the first electrode 1101, the first electrode 1101 is wound.

[0168] In some embodiments, the adhesive tape 1 may be attached to the surface of the first pole piece 1101 facing the winding center.

[0169] In some embodiments, the adhesive tape 1 may be attached to the surface of the first pole piece 1101 that is away from the winding center.

[0170] In some embodiments, the adhesive tape 1 can be attached to two surfaces of the first electrode 1101 .

[0171] In some embodiments, on the partially bent section 11011 of the first electrode 1101, the adhesive tape 1 may be attached to two surfaces of the first electrode 1101. On the other partially bent section 11011 of the first electrode 1101, the adhesive tape 1 may be attached to one surface of the first electrode 1101.

[0172] When the adhesive tape 1 has a first blank area 112, the adhesive tape 1 is affixed to at least one bent section 11011 of the first electrode sheet 1101. During the manufacturing process of the electrode assembly 110, due to the setting of the first blank area 112, the adhesive layer 20 can occupy part of the first blank area 112, or the adhesive layer 20 can be flush with the first side surface 13, which can reduce the probability of the adhesive layer 20 overflowing from the first side surface 13, reduce the probability of the adhesive layer 20 flowing out of the first side surface 13, reduce the risk of the adhesive tape 1 adhering to the diaphragm 1103, and further reduce the risk of metal ion precipitation, thereby improving the reliability of the battery cell 100.

[0173] In some embodiments, in the finished electrode assembly 110 , the adhesive layer 20 of the adhesive paper 1 may flow out from the substrate 10 , but the flowed adhesive layer 20 is flush with the first side surface 13 , or the flowed adhesive layer 20 is small and can be ignored.

[0174] When the adhesive tape 1 has a first edge portion 22, the adhesive tape 1 is attached to at least one bending segment 11011 of the first electrode sheet 1101. During the manufacturing process of the electrode assembly 110, since the thickness of the first edge portion 22 of the adhesive layer 20 is less than the thickness of the main body 21, the main body 21 can flow to the first edge portion 22, which can reduce the probability of the first edge portion 22 of the adhesive layer 20 flowing out from the first side surface 13, reduce the risk of the adhesive tape 1 adhering to the diaphragm 1103, and further reduce the risk of metal ion precipitation, thereby improving the reliability of the battery cell 100.

[0175] In some embodiments, in the finished electrode assembly 110 , the first edge portion 22 of the adhesive tape 1 may flow out from the substrate 10 , but the flowed first edge portion 22 is flush with the first side surface 13 , or the flowed first edge portion 22 is small and can be ignored.

[0176] According to the technical solution of the embodiment of the present application, the bent section 11011 of the first pole piece 1101 is affixed with adhesive tape 1 to reduce the risk of the material of the first pole piece 1101 falling off when forming the electrode assembly 110, thereby causing the electrode assembly 110 to precipitate metal ions. At the same time, the adhesive tape 1 reduces the risk of the adhesive layer 20 overflowing and thereby adhering to the diaphragm 1103, thereby causing the electrode assembly 110 to precipitate metal ions, thereby improving the reliability of the battery cell 100.

[0177] Please refer to Figure 4 In some embodiments, adhesive tape 1 is attached to both sides of at least one bending section 11011 in the thickness direction.

[0178] In some embodiments, the thickness direction of the first pole piece 1101 may be the thickness direction Y of the substrate 10 .

[0179] In some embodiments, the adhesive tape 1 attached to both sides of the first pole piece 1101 can be aligned at both ends.

[0180] In some embodiments, the adhesive tapes 1 attached to both sides of the first electrode piece 1101 may be aligned at one end.

[0181] In some embodiments, the adhesive tape 1 attached to both sides of the first electrode 1101 may not be aligned at both ends.

[0182] According to the technical solution of the embodiment of the present application, adhesive tape 1 is affixed on both sides of the bending section 11011 in the thickness direction, so that the two sides of the bending section have better consistency, reducing the risk of breakage of the first pole piece 1101, and at the same time reducing the risk of surface material falling off on both sides of the bending section 11011, thereby improving the reliability of the battery cell 100.

[0183] Please refer to Figure 4 In some embodiments, adhesive tape 1 is attached to the innermost bending section 11011 of the first pole piece 1101 .

[0184] In some embodiments, the innermost circle of the first pole piece 1101 may be two bent sections 11011 , and the two bent sections 11011 are arranged opposite to each other with respect to the winding center.

[0185] In the technical solution of the embodiment of the present application, the innermost bent section 11011 of the first pole piece 1101 is adhered with the adhesive tape 1, so as to reduce the risk of metal ion precipitation in the innermost bent section 11011 of the first pole piece 1101 and improve the reliability of the battery cell 100.

[0186] In some embodiments, the first electrode 1101 is a positive electrode.

[0187] In some embodiments, the second electrode piece 1102 may be a negative electrode piece.

[0188] In the technical solution of the embodiment of the present application, adhesive tape 1 is attached to the positive electrode sheet to reduce the risk of material falling off the surface of the first electrode sheet 1101 and causing metal ions to precipitate from the second electrode sheet 1102 , thereby improving the reliability of the battery cell 100 .

[0189] The embodiment of the present application further provides a battery 200 , comprising the battery cell 100 of any of the above embodiments.

[0190] An embodiment of the present application further provides an electrical device, comprising a battery cell 100 of any of the above embodiments or a battery 200 of any of the above embodiments, wherein the battery cell 100 or the battery 200 is used to provide electrical energy.

[0191] Please refer to Figures 4 to 10In some embodiments, the battery cell 100 includes an electrode assembly 110, and the electrode assembly 110 is a wound structure. The electrode assembly 110 includes a first pole piece 1101, a second pole piece 1102, and a diaphragm 1103. The first pole piece 1101 and the second pole piece 1102 have opposite polarities. The diaphragm 1103 is disposed between the first pole piece 1101 and the second pole piece 1102. The first pole piece 1101 is a positive pole piece. The innermost bending section 11011 of the first pole piece 1101 is affixed with adhesive tape 1, and the adhesive tape 1 is affixed to both sides of the first pole piece 1101 in the thickness direction. In the electrode assembly 110 after manufacturing, the glue of the adhesive tape 1 does not flow out.

[0192] The adhesive tape 1 includes a substrate 10 and an adhesive layer 20. The substrate 10 has a first surface 11 and a second surface 12 opposite to each other in the thickness direction Y thereof, and has a first side surface 13 and a second side surface 14 in the first direction X, and the first side surface 13 and the second side surface 14 are arranged opposite to each other. The first side surface 13 connects the first surface 11 and the second surface 12, and the second side surface 14 connects the first surface 11 and the second surface 12. The first direction X is perpendicular to the thickness direction Y of the substrate 10. The adhesive layer 20 is arranged on the first surface 11.

[0193] In some embodiments, the first surface 11 includes a first blank area 112 not coated with the glue layer 20, a glue-coated area 111 coated with the glue layer 20, and a second blank area 113 not coated with the glue layer 20, which are sequentially arranged along the first direction X. The first blank area 112 connects the glue-coated area 111 and the first side surface 13, and the second blank area 113 connects the glue-coated area 111 and the second side surface 14. That is, when the adhesive tape 1 is attached to the first electrode 1101, the glue layer 20 does not flow out from the first blank area 112 to the first side surface 13, and the glue layer 20 does not flow out from the second blank area 113 to the second side surface 14.

[0194] In such a battery cell, the adhesive tape 1 has a first blank area 112 and a second blank area 113. During the manufacturing process of the electrode assembly 110, due to the setting of the first blank area 112 and the second blank area 113, the adhesive layer 20 can occupy part of the first blank area 112, or part of the second blank area 113, or the adhesive layer 20 can be flush with the first side surface 13, or the adhesive layer can be flush with the second side surface 14, thereby reducing the probability of the adhesive layer 20 overflowing from the first side surface 13, reducing the probability of the adhesive layer 20 overflowing from the second side surface 14, reducing the risk of the adhesive tape 1 adhering to the diaphragm 1103, and further reducing the risk of metal ion precipitation, thereby improving the reliability of the battery cell 100.

[0195] In other embodiments, the adhesive layer 20 includes a first edge portion 22, a main body portion 21, and a second edge portion 23 sequentially arranged along the first direction X. Along the first direction X, the first edge portion 22 is closer to the first side surface 13 than the main body portion 21, and the second edge portion 23 is closer to the second side surface 14 than the main body portion 21. In the thickness direction Y of the substrate 10, the thickness of the first edge portion 22 is less than the thickness of the main body portion 21, and the thickness of the second edge portion 23 is less than the thickness of the main body portion 21. That is, when the adhesive tape 1 is attached to the first pole piece 1101, the first edge portion 22 of the adhesive layer 20 does not flow out to the first side surface 13, and the second edge portion 23 of the adhesive layer 20 does not flow out to the second side surface 14.

[0196] In such a battery cell, when the adhesive tape 1 has a first edge portion 22 and a second edge portion 23, during the manufacturing process of the electrode assembly 110, since the thickness of the first edge portion 22 of the adhesive layer 20 is less than the thickness of the main body 21, the main body 21 can flow to the first edge portion 22, or the adhesive layer 20 can be flush with the first side surface 13, which can reduce the probability of the first edge portion 22 of the adhesive layer 20 flowing out from the first side surface 13. Since the thickness of the second edge portion 23 of the adhesive layer 20 is less than the thickness of the main body 21, the main body 21 can flow to the second edge portion 23, or the adhesive layer 20 can be flush with the second side surface 14, which can reduce the probability of the second edge portion 23 of the adhesive layer 20 flowing out from the second side surface 14, thereby reducing the risk of the adhesive tape 1 adhering to the diaphragm 1103, thereby reducing the risk of metal ion precipitation and improving the reliability of the battery cell 100.

[0197] The technical solution of the embodiment of the present application is to stick the adhesive tape 1 on the first pole piece 1101, reduce the probability of the adhesive layer 20 overflowing, reduce the risk of the adhesive tape 1 being stuck to the pole piece and the adhesive layer 20 overflowing and thus adhering to the diaphragm 1103, causing the electrode assembly 110 to precipitate metal ions, and improve the reliability of the battery cell 100.

[0198] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tape, characterized in that: include: A substrate, wherein the substrate has a first surface and a second surface opposite to each other in a thickness direction thereof, the substrate has a first side surface in the first direction, the first side surface connects the first surface and the second surface, and the first direction is perpendicular to the thickness direction of the substrate; An adhesive layer, disposed on the first surface; The first surface includes a glue-coated area coated with the glue layer and a first blank area not coated with the glue layer, and the first blank area connects the glue-coated area and the first side surface.

2. The adhesive tape according to claim 1, characterized in that: The substrate further includes a second side surface, and in the first direction, the second side surface is arranged opposite to the first side surface; The first surface also includes a second blank area not coated with the glue layer. Along the first direction, the glue-coated area is located between the first blank area and the second blank area. The second blank area connects the glue-coated area and the second side surface.

3. The adhesive tape according to claim 1, characterized in that: In the first direction, the width of the first blank area is L1, which satisfies the condition: 0.5 mm ≤ L1 ≤ 2 mm.

4. The adhesive tape according to claim 3, characterized in that: 0.8mm≤L1≤1.2mm.

5. The adhesive tape according to claim 2, characterized in that: In the first direction, the width of the second blank area is L2, which satisfies the condition: 0.5 mm ≤ L2 ≤ 2 mm.

6. The adhesive tape according to claim 5, characterized in that: 0.8mm≤L2≤1.2mm.

7. A tape, characterized in that: include: A substrate, wherein the substrate has a first surface and a second surface opposite to each other in a thickness direction thereof, the substrate has a first side surface in the first direction, the first side surface connects the first surface and the second surface, and the first direction is perpendicular to the thickness direction of the substrate; An adhesive layer, disposed on the first surface; Wherein, the adhesive layer includes a main body portion and a first edge portion, and along the first direction, the first edge portion is closer to the first side surface than the main body portion; In a thickness direction of the substrate, the thickness of the first edge portion is smaller than the thickness of the main body portion.

8. The adhesive tape according to claim 7, characterized in that: The substrate further includes a second side surface, and in the first direction, the second side surface is arranged opposite to the first side surface; The adhesive layer further includes a second edge portion, and along the first direction, the second edge portion is closer to the second side surface than the main body portion, and the main body portion is located between the first edge portion and the second edge portion; In a thickness direction of the substrate, a thickness of the second edge portion is smaller than a thickness of the main body portion.

9. The adhesive tape according to claim 7, characterized in that: In the first direction, the width of the first edge portion is L3, which satisfies the condition: 0.5 mm ≤ L3 ≤ 2 mm.

10. The adhesive tape according to claim 8, characterized in that: In the first direction, the width of the second edge portion is L4, which satisfies the condition: 0.5 mm ≤ L4 ≤ 2 mm.

11. A battery cell, characterized in that: The electrode assembly comprises an electrode assembly having a winding structure, comprising a first pole piece, a second pole piece and a diaphragm, wherein the first pole piece and the second pole piece have opposite polarities, and the diaphragm is arranged between the first pole piece and the second pole piece; Among them, at least one bending section of the first pole piece is pasted with the adhesive tape as described in any one of claims 1 to 10, and the first direction is the winding direction of the electrode assembly.

12. The battery cell according to claim 11, characterized in that: The adhesive tape is attached to both sides of at least one bending section in the thickness direction.

13. The battery cell according to claim 11, characterized in that: The adhesive tape is attached to the innermost bending section of the first pole piece.

14. The battery cell according to claim 11, characterized in that: The first pole piece is a positive pole piece.

15. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 11 to 14.

16. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 11 to 14 or the battery according to claim 15, wherein the battery cell or the battery is used to provide electrical energy.

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