Adhesive tape, battery cell, battery and electrical device

Abstract

Embodiments of the present application provide an adhesive tape, a battery cell, a battery, and an electrical device. The adhesive tape comprises a base material and an adhesive layer. The base material has a first surface and a second surface, which are opposite one another in a thickness direction thereof, and the base material has a first side surface in a first direction, the first side surface connecting the first and second surfaces, and the first direction being perpendicular to the thickness direction of the base material. The adhesive layer is disposed on the first surface. The first surface comprises an adhesive coated region coated with the adhesive layer, and a first empty region not coated with the adhesive layer, the first empty region connecting the adhesive coated region and the first side surface. The technical solution provided in the present application can improve battery cell reliability.

Description

Adhesive paper, battery monomer, battery and electric device Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 202420724253.2, filed on April 9, 2024, entitled “Adhesive paper, battery monomer, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery production, in particular, relates to an adhesive paper, a battery monomer, a battery and an electric device. BACKGROUND

[0003] Energy saving and emission reduction is 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 energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the development of battery technology, how to improve the reliability of the battery monomer is a technical problem that needs to be solved in battery technology. SUMMARY

[0005] The present application provides an adhesive paper, a battery monomer, a battery and an electric device, which can improve the reliability of the battery monomer.

[0006] The present application is achieved by the following technical solutions:

[0007] In a first aspect, the present application provides an adhesive paper. The adhesive paper comprises a substrate and an adhesive layer. The substrate has opposite first and second surfaces in the thickness direction thereof, and has a first side surface in a first direction, the first side surface connecting the first and second surfaces, and the first direction being perpendicular to the thickness direction of the substrate. The adhesive layer is provided on the first surface. The first surface comprises a coated area coated with the adhesive layer and a first blank area not coated with the adhesive layer, and the first blank area connects the coated area and the first side surface.

[0008] The technical solution of the present application embodiment, the first surface of the substrate comprises a coated area and a first blank area, the adhesive layer is coated on the coated area, and the first blank area connects the coated area and the first side surface, thereby reducing the probability of adhesive layer overflow from the first surface to the first side surface, reducing the risk of adhesive paper being attached to the pole piece, the diaphragm being adhered due to adhesive layer overflow, and the electrode assembly being precipitated metal ions, and improving the reliability of the battery monomer.

[0009] In some embodiments, the substrate further comprises a second side surface, and the second side surface is arranged opposite to the first side surface in the first direction. The first surface further comprises a second blank area not coated with the adhesive layer, and the coated area is located between the first blank area and the second blank area in the first direction, and the second blank area connects the coated area and the second side surface.

[0010] The technical scheme of the embodiment of the application reduces the probability of overflow of the adhesive layer from the second side surface to the first surface, reduces the risk of metal ion precipitation of the electrode assembly caused by overflow of the adhesive paper when the adhesive paper is attached to the pole piece, and improves the reliability of the battery monomer.

[0011] In some embodiments, in the first direction, the width of the first blank area is L1, and the condition is 0.5mm≤L1≤2mm.

[0012] The technical scheme of the embodiment of the application reduces the probability of overflow of the adhesive layer from the second side surface to the first surface, reduces the risk of metal ion precipitation of the electrode assembly caused by overflow of the adhesive paper when the adhesive paper is attached to the pole piece, and improves the reliability of the battery monomer.

[0013] In some embodiments, 0.8mm≤L1≤1.2mm.

[0014] The technical scheme of the embodiment of the application reduces the probability of overflow of the adhesive layer from the second side surface to the first surface, reduces the risk of metal ion precipitation of the electrode assembly caused by overflow of the adhesive paper when the adhesive paper is attached to the pole piece, and improves the reliability of the battery monomer.

[0015] In some embodiments, in the first direction, the width of the second blank area is L2, and the condition is 0.5mm≤L2≤2mm.

[0016] The technical scheme of the embodiment of the application reduces the probability of overflow of the adhesive layer from the second side surface to the first surface, reduces the risk of metal ion precipitation of the electrode assembly caused by overflow of the adhesive paper when the adhesive paper is attached to the pole piece, and improves the reliability of the battery monomer.

[0017] In some embodiments, 0.8mm≤L2≤1.2mm.

[0018] The technical scheme of the embodiment of the application reduces the probability of overflow of the adhesive layer from the second side surface to the first surface, reduces the risk of metal ion precipitation of the electrode assembly caused by overflow of the adhesive paper when the adhesive paper is attached to the pole piece, and improves the reliability of the battery monomer.

[0019] In a second aspect, the application provides an adhesive paper. The adhesive paper comprises a substrate and an adhesive layer. The substrate has opposite first and second surfaces in the thickness direction thereof, and has a first side surface in the first direction, the first side surface connecting the first and second surfaces, and the first direction being perpendicular to the thickness direction of the substrate. The adhesive layer is arranged on the first surface. The adhesive layer comprises a main body portion and a first edge portion, and the first edge portion is closer to the first side surface than the main body portion in the first direction. In the thickness direction of the substrate, the thickness of the first edge portion is less than the thickness of the main body portion.

[0020] The technical scheme of the embodiment of the present application is that the first edge part is closer to the first side surface than the main part, and the thickness of the first edge part is smaller than the thickness of the main part, thereby reducing the probability of overflow of the adhesive layer from the first surface to the first side surface, reducing the risk of the adhesive paper being attached to the pole piece and adhering to the diaphragm due to overflow of the adhesive layer, causing the electrode assembly to release metal ions, and improving the reliability of the battery monomer.

[0021] In some embodiments, the substrate further comprises a second side surface, and the second side surface is arranged opposite to the first side surface in the first direction. The adhesive layer further comprises a second edge part, and the second edge part is closer to the second side surface than the main part in the first direction, and the main part is located between the first edge part and the second edge part. The thickness of the second edge part is smaller than the thickness of the main part in the thickness direction of the substrate.

[0022] The technical scheme of the embodiment of the present application is that the second edge part is closer to the second side surface than the main part, and the thickness of the second edge part is smaller than the thickness of the main part, thereby reducing the probability of overflow of the adhesive layer from the first surface to the second side surface, reducing the risk of the adhesive paper being attached to the pole piece and causing the electrode assembly to release metal ions, and improving the reliability of the battery monomer.

[0023] In some embodiments, the width of the first edge part is L3 in the first direction, and the condition 0.5mm≤L3≤2mm is satisfied.

[0024] The technical scheme of the embodiment of the present application is that the width of the first edge part satisfies the above condition, the process is easy to implement, the probability of the corresponding region of the substrate of the first edge part being folded is reduced, the risk of the adhesive paper being attached to the pole piece, the substrate being folded to increase the stress of the diaphragm, and the electrode assembly releasing metal ions is reduced, and the reliability of the battery monomer is improved.

[0025] In some embodiments, the width of the second edge part is L4 in the first direction, and the condition 0.5mm≤L4≤2mm is satisfied.

[0026] The technical scheme of the embodiment of the present application is that the width of the second edge part satisfies the above condition, the process is easy to implement, the probability of the corresponding region of the substrate of the second edge part being folded is reduced, the risk of the adhesive paper being attached to the pole piece, the substrate being folded to increase the stress of the diaphragm, and the electrode assembly releasing metal ions is reduced, and the reliability of the battery monomer is improved.

[0027] In a third aspect, the present application provides a battery monomer. The battery monomer comprises an electrode assembly, and the electrode assembly is in a winding structure. The electrode assembly comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece and the second pole piece are opposite in polarity, and the diaphragm is arranged between the first pole piece and the second pole piece. At least one folded section of the first pole piece is attached with the adhesive paper of any one of the embodiments of the first aspect or the adhesive paper of any one of the embodiments of the second aspect, and the first direction is the winding direction of the electrode assembly.

[0028] The technical solution of the embodiment of the application, the bending section of the first pole piece is attached with the adhesive paper, which reduces the risk of the material on the surface of the first pole piece falling off and causing the metal ions in the electrode assembly to be precipitated, and the adhesive paper reduces the risk of the adhesive layer overflowing and causing the diaphragm to be adhered and the metal ions in the electrode assembly to be precipitated, thereby improving the reliability of the battery monomer.

[0029] In some embodiments, both sides of the at least one bending section in the thickness direction are attached with the adhesive paper.

[0030] The technical solution of the embodiment of the application, the bending section of the first pole piece is attached with the adhesive paper, which reduces the risk of the material on the surface of the first pole piece falling off and causing the metal ions in the electrode assembly to be precipitated, and the adhesive paper reduces the risk of the adhesive layer overflowing and causing the diaphragm to be adhered and the metal ions in the electrode assembly to be precipitated, thereby improving the reliability of the battery monomer.

[0031] In some embodiments, the bending section of the innermost circle of the first pole piece is attached with the adhesive paper.

[0032] The technical solution of the embodiment of the application, the bending section of the first pole piece is attached with the adhesive paper, which reduces the risk of the material on the surface of the first pole piece falling off and causing the metal ions in the electrode assembly to be precipitated, and the adhesive paper reduces the risk of the adhesive layer overflowing and causing the diaphragm to be adhered and the metal ions in the electrode assembly to be precipitated, thereby improving the reliability of the battery monomer.

[0033] In some embodiments, the first pole piece is a positive pole piece.

[0034] The technical solution of the embodiment of the application, the positive pole piece is attached with the adhesive paper, which reduces the risk of the material on the surface of the first pole piece falling off and causing the metal ions in the electrode assembly to be precipitated, thereby improving the reliability of the battery monomer.

[0035] In a fourth aspect, the application provides a battery comprising the battery monomer of any one of the embodiments of the third aspect.

[0036] In a fifth aspect, the application further provides a power utilization device comprising the battery monomer of any one of the embodiments of the third aspect or the battery of any one of the embodiments of the fourth aspect, and the battery monomer or the battery is used to provide electric energy.

[0037] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0039] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0040] Fig. 2 is a structural schematic diagram of a battery according to some embodiments of the present application;

[0041] Fig. 3 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0042] Fig. 4 is a structural schematic diagram of an electrode assembly according to some embodiments of the present application;

[0043] Fig. 5 is a structural schematic diagram of a tape according to some embodiments of the present application;

[0044] Fig. 6 is a schematic diagram of another perspective view of the tape in Fig. 4;

[0045] Fig. 7 is a structural schematic diagram of a tape according to some other embodiments of the present application;

[0046] Fig. 8 is a schematic diagram of another perspective view of the tape in Fig. 7;

[0047] Fig. 9 is a partially expanded schematic diagram of an electrode assembly according to some embodiments of the present application;

[0048] Fig. 10 is a partially expanded schematic diagram of an electrode assembly according to some other embodiments of the present application.

[0049] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application; DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms used in the description of the present application are used for illustrative purposes only and are not intended to limit the scope of the application. The summary of the application and its teachings do not purport to be exhaustive or to be limited to a single embodiment, as the specialty of the application is described with reference to the appended drawings and figures.

[0052] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to one of ordinary skill in the art, embodiments described herein can be combined with one another.

[0053] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be 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.

[0054] The term "and / or" in the application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents an "or" relationship between the front and rear associated objects.

[0055] "Multiple" appearing in the application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0056] In some embodiments, the battery can be a battery module, and when there are multiple battery monomers, the multiple battery monomers are arranged and fixed to form a battery module.

[0057] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and a battery monomer, and the battery monomer or the battery module is contained in the box body.

[0058] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can become at least part of a floor of the vehicle, or portions of the box can become at least part of cross members and longitudinal members of the vehicle.

[0059] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, and the like.

[0060] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0061] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, and the like.

[0062] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell.

[0063] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During 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.

[0064] In some embodiments, the positive electrode can be a positive electrode tab, 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.

[0065] 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.

[0066] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high molecular 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 high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0068] In some embodiments, the negative electrode can be a negative electrode tab, and the negative electrode tab can include a negative electrode current collector.

[0069] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, and the like with carbon, nickel, or titanium can be employed.

[0070] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0071] As an example, the negative electrode active material can employ a negative electrode active material for a battery known in the art. As an example, the negative electrode 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, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0072] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0073] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film 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 member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0074] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0075] In some embodiments, the electrode assembly is a wound structure. The positive electrode tab and the negative electrode tab are wound to form the wound structure.

[0076] At present, from the development of market situation, the battery has been widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as electric tools, unmanned aerial vehicles, energy storage equipment and other fields. With the continuous expansion of the field of battery, the demand of its market is also increasing.

[0077] The development of battery technology should consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, with the change of environmental conditions and / or internal conditions of the battery, the reliability of the battery is also one of the key factors to be considered.

[0078] At present, in the winding type 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. The positive electrode sheet and the negative electrode sheet are separated by the separator. 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 the metal ions to be precipitated from the negative electrode sheet, which may cause the charge-discharge performance of the battery to decrease, the service life to be shortened, or other safety hazards to occur.

[0079] In order to reduce the risk of active material falling off from the surface of the positive electrode sheet, adhesive tape is usually attached to the surface of the positive electrode sheet, especially the bending section of the positive electrode sheet with high 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 overflowed adhesive layer has the risk of sticking to the separator, thereby affecting the passage of metal ions and causing the metal to be precipitated from the negative electrode sheet, which affects the reliability of the battery.

[0080] In order to reduce the risk of the adhesive layer of the adhesive tape overflowing and affecting the reliability of the battery, the present application provides an adhesive tape. The adhesive tape comprises a substrate and an adhesive layer. The substrate has opposite first and second surfaces in the thickness direction thereof, and has a first side surface in a first direction, the first side surface connecting the first and second surfaces, and the first direction being perpendicular to the thickness direction of the substrate. The adhesive layer is arranged on the first surface.

[0081] The first surface comprises a coated area coated with the adhesive layer and a first blank area not coated with the adhesive layer, and the first blank area connects the coated area and the first side surface.

[0082] Alternatively, the adhesive layer comprises a main body portion and a first edge portion, and the first edge portion is closer to the first side surface than the main body portion in the first direction. In the thickness direction of the substrate, the thickness of the first edge portion is less than the thickness of the main body portion.

[0083] The first edge portion is arranged closer to the first side surface than the main body portion, so that the probability of overflow of the adhesive layer from the first side surface to the first surface is reduced, the risk of the adhesive paper being attached to the pole piece and the separator being adhered due to overflow of the adhesive layer and causing metal ions to be precipitated from the electrode assembly is reduced, and the reliability of the battery cell is improved.

[0084] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. A power supply system of the electric device can be composed of the battery disclosed in the present application.

[0085] The electric device using the battery as a power supply can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0086] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0087] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended electric vehicle. The vehicle 1000 is internally provided with a battery 200, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 200 can be used for power supply of the vehicle 1000, for example, the battery 200 can be used as an operating power supply of the vehicle 1000, which is used for the working power demand of the circuit system of the vehicle 1000, such as the starting, navigation and running of the vehicle 1000.

[0088] The vehicle 1000 can further include a controller 1100 and a motor 1200, and the controller 1100 is used to control the battery 200 to supply power to the motor 1200, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0089] In some embodiments of the present application, the battery 200 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to FIG. 2, which is an exploded view of a battery according to some embodiments of the present application. The battery 200 can further include a box 210 in which the battery cell 100 is accommodated. The box 210 is configured to provide a space for accommodating the battery cell 100, and can have various structures. In some embodiments, the box 210 can include a first sub-box 220 and a second sub-box 230. The first sub-box 220 and the second sub-box 230 are coupled to each other to define a space for accommodating the battery cell 100. The second sub-box 230 can be a hollow structure with one open end, and the first sub-box 220 can be a plate structure. The first sub-box 220 is coupled to the open end of the second sub-box 230 to define the space for accommodating the battery cell 100. Alternatively, the first sub-box 220 and the second sub-box 230 can both be hollow structures with one open end, and the open end of the first sub-box 220 is coupled to the open end of the second sub-box 230.

[0091] In the battery 200, the battery cell 100 can be multiple, and the multiple battery cells 100 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 100 are connected in series and in parallel. The multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed manner, and then accommodated in the box 210. Alternatively, the multiple battery cells 100 can be connected in series, in parallel, or in a mixed manner to form a battery 200 module, and then multiple battery 200 modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the box 210. The battery 200 can further include other structures. For example, the battery 200 can further include a busbar component for electrically connecting the multiple battery cells 100.

[0092] The battery cell 100 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0093] Please refer to FIG. 3, which is an exploded view of a battery cell according to some embodiments of the present application. As shown in FIG. 3, the battery cell 100 includes an outer case 120, an electrode assembly 110, and an electrode terminal 150. The outer case 120 includes a case body 130 and an end cap 140. The case body 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.

[0094] The shell 130 is a component for cooperating with the end cover 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 shell 130 and the end cover 140 can be independent components. The shell 130 can be of various shapes and various sizes. Specifically, the shape of the shell 130 can be determined according to the specific shape and size of the electrode assembly 110. The material of the shell 130 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0095] The end cover 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 cover 140 can be adapted to the shape of the shell 130 to cooperate with the shell 130. Optionally, the end cover 140 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 140 is not easy to deform when subjected to extrusion collision, so that the battery cell 100 can have higher structural strength, and the reliability can also be improved. Functional components such as electrode terminals can be provided on the end cover 140. The electrode terminals can be used to electrically connect with the electrode assembly 110 for outputting or inputting the electrical energy of the battery cell 100. The material of the end cover 140 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 140, which can be used to isolate the electrical connection components in the shell 130 from the end cover 140 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0096] Please refer to FIG. 4, which is a structural schematic diagram of an electrode assembly provided by some embodiments of the present application. As shown in the figure, the electrode assembly 110 is a component in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 110 can be contained in the shell 130. The electrode assembly 110 is mainly formed by winding the first electrode sheet 1101 and the second electrode sheet 1102, and a separator 1103 is usually provided between the first electrode sheet 1101 and the second electrode sheet 1102, which is used to separate the first electrode sheet 1101 and the second electrode sheet 1102 to reduce the risk of internal short circuit of the first electrode sheet 1101 and the second electrode sheet 1102. The part of the first electrode sheet 1101 and the second electrode sheet 1102 with active material constitutes the main body of the electrode assembly 110, and the part of the first electrode sheet 1101 and the second electrode sheet 1102 without active material respectively constitutes the tab. Among them, the first electrode sheet 1101 can be a positive electrode sheet, and the second electrode sheet 1102 can be a negative electrode sheet. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body respectively. In the charging and discharging process of the battery 200, the positive active material and the negative active material react with the electrolyte, and the tab connects the electrode terminal to form a current loop.

[0097] Please refer to FIG. 5 and FIG. 6, FIG. 5 is a structural schematic diagram of the adhesive paper provided by some embodiments of the present application, and FIG. 6 is a schematic diagram of another perspective of the adhesive paper in FIG. 4. In FIG. 5, the boundary of the adhesive layer is shown by a dashed line, and in FIG. 6, the boundaries of the first blank area, the adhesive application area and the second blank area are shown by dashed lines. The present application provides an adhesive paper 1. The adhesive paper 1 comprises a substrate 10 and an adhesive layer 20. The substrate 10 has opposite first and second surfaces 11 and 12 in a thickness direction Y, and has a first side surface 13 in a first direction X, the first side surface 13 connecting the first and second surfaces 11 and 12, and the first direction X being perpendicular to the thickness direction Y of the substrate 10. The adhesive layer 20 is arranged on the first surface 11. The first surface 11 comprises an adhesive application 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 adhesive application area 111 and the first side surface 13.

[0098] In some embodiments, the material of the substrate 10 can be a high molecular base film such as PP (Polypropylene), PE (Polyethylene), BOPP (Biaxially Oriented Polypropylene), PET (Polyetherimide) and PI (Polyimide).

[0099] In some embodiments, the substrate 10 can be a material that allows metal ions to pass through, or a material that does not allow metal ions to pass through.

[0100] In some embodiments, the material of the adhesive layer 20 can be a special glue for polypropylene material bonding, an acrylate-based glue, etc.

[0101] In some embodiments, the adhesive paper 1 can have a coiled structure during storage. After the adhesive layer 20 is coated on the first surface 11 of the substrate 10, it can be coiled and stored, and the first surface 11 can be the surface of the adhesive paper 1 facing the center of the coiling.

[0102] In some embodiments, in the thickness direction Y of the substrate 10, one end of the first side surface 13 can be connected to the first surface 11, and the other end can be connected to the second surface 12.

[0103] In some embodiments, the first surface 11 can comprise the adhesive application area 111 and the first blank area 112. In the first direction X, one end of the first blank area 112 can be connected to the first side surface 13, and the other end of the first blank area 112 can be connected to the one end of the adhesive application area 111 close to the first side surface 13.

[0104] In some embodiments, the first blank area 112 and the glue applying area 111 can be pre-divided on the substrate 10. When gluing, the glue layer 20 is coated according to the boundaries of the first blank area 112 and the glue applying area 111.

[0105] In some embodiments, the first blank area 112 and the glue applying area 111 can not be pre-divided on the substrate 10. According to the size of the glue layer 20 coating, after coating, the first blank area 112 and the glue applying area 111 are divided according to the boundaries of the glue layer 20.

[0106] In some embodiments, the first direction can be represented by the direction indicated by the letter X in the figure. The thickness direction of the substrate 10 can be represented by the direction indicated by the letter Y in the figure.

[0107] The technical scheme of the embodiments of the present application, the first surface 11 of the substrate 10 includes a glue applying area 111 and a first blank area 112, the glue layer 20 is coated on the glue applying area 111, and the first blank area 112 connects the glue applying area 111 and the first side surface 13, thereby reducing the probability of overflow of the glue layer 20 from the first side surface 13 of the first surface 11, reducing the risk of metal ion release of the electrode assembly 110 caused by the adhesion of the separator 1103 due to the overflow of the glue layer 20, and improving the reliability of the battery monomer 100.

[0108] Please refer to FIG. 5 and FIG. 6, in some embodiments, the substrate 10 further includes a second side surface 14. In the first direction X, the second side surface 14 is arranged opposite to the first side surface 13. The first surface 11 further includes a second blank area 113 which is not coated with the glue layer 20, and in the first direction X, the glue applying area 111 is located between the first blank area 112 and the second blank area 113, and the second blank area 113 connects the glue applying area 111 and the second side surface 14.

[0109] In some embodiments, in the first direction X, the second side surface 14 is arranged opposite to the first side surface 13. In the thickness direction Y of the substrate 10, one end of the second side surface 14 connects one end of the first surface 11 away from the first side surface 13, and the other end of the second side surface 14 connects one end of the second surface 12 away from the second side surface 14.

[0110] In the first direction X, one end of the first blank area 112 connects the first side surface 13, the other end of the first blank area 112 connects one end of the glue applying area 111, the other end of the glue applying area 111 connects one end of the second blank area 113, and the other end of the second blank area 113 connects the second side surface 14.

[0111] In some embodiments, the second blank area 113 and the glue applying area 111 can be pre-divided on the substrate 10. When gluing, the glue layer 20 is coated according to the boundaries of the second blank area 113 and the glue applying area 111.

[0112] In some embodiments, the second blank area 113 and the adhesive coating area 111 may not be pre-divided on the substrate 10. According to the size of the adhesive layer 20, after coating, the second blank area 113 and the adhesive coating area 111 are divided according to the boundary of the adhesive layer 20.

[0113] 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 adhesive tape 1 when the adhesive tape 1 is attached to the electrode sheet, thereby improving the reliability of the battery cell 100.

[0114] 5 and 6 , in some embodiments, in the first direction X, the width of the first blank area 112 is L1, which satisfies the condition: 0.5 mm ≤ L1 ≤ 2 mm.

[0115] In some embodiments, in the first direction X, the width L1 of the first blank area 112 meets the above conditions, and L1 can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc.

[0116] In some embodiments, the width L1 of the first blank area 112 may be measured by aligning one end of a measuring ruler with the first side surface 13 and measuring the distance from the first side surface 13 to the glue-coated area 111 with the other end.

[0117] In some embodiments, the end of the first blank area 112 away from the first side surface 13 can be a straight line or an irregular edge line.

[0118] According to the technical solution of the embodiment of the present application, the width of the first blank area 112 meets the above conditions. While the process is easy to implement, the probability of folding of the first blank area 112 of the substrate 10 is reduced, and the risk of folding of the first blank area 112 when the adhesive tape 1 is attached to the electrode, 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.

[0119] 5 and 6 , in some embodiments, 0.8 mm ≤ L1 ≤ 1.2 mm.

[0120] In some embodiments, in the first direction X, the width L1 of the first blank area 112 meets the above conditions, and L1 can be 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, etc.

[0121] 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.

[0122] Please refer to FIG. 5 and FIG. 6, in some embodiments, in the first direction X, the width of the second margin area 113 is L2, which satisfies the condition: 0.5mm≤L2≤2mm.

[0123] In some embodiments, in the first direction X, the width L2 of the second margin area 113 satisfies the above condition, L2 can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0124] In some embodiments, the method of measuring the width L2 of the second margin area 113 can 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 area 111 with the other end of the measuring ruler.

[0125] In some embodiments, the end of the second margin area 113 away from the second side surface 14 can be a straight line or an irregular edge.

[0126] In some embodiments, in the first direction X, the width L1 of the first margin area 112 can be the same as the width L2 of the second margin area 113.

[0127] In some embodiments, in the first direction X, the width L1 of the first margin area 112 can be different from the width L2 of the second margin area 113.

[0128] The technical scheme of the embodiments of the present application, the width of the second margin area 113 satisfies the above condition, which is easy to implement while reducing the probability of the second margin area 113 of the substrate 10 being folded, and improving the reliability of the battery monomer 100.

[0129] Please refer to FIG. 5 and FIG. 6, in some embodiments, 0.8mm≤L2≤1.2mm.

[0130] In some embodiments, in the first direction X, the width L2 of the second margin area 113 satisfies the above condition, L2 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0131] The technical scheme of the embodiments of the present application, the width of the second margin area 113 satisfies the above condition, which further reduces the process difficulty and improves the reliability of the battery monomer 100.

[0132] Referring to FIG. 7 and FIG. 8, FIG. 7 is a schematic structural diagram of the adhesive paper according to some embodiments of the present application, and FIG. 8 is a schematic structural diagram of the adhesive paper in another view of FIG. 7. In FIG. 7, the adhesive layer completely covers the substrate, and thus only the structure of the adhesive layer is shown, in which the boundaries of the first edge portion, the main body portion and the second edge portion are indicated by dashed lines. The present application also provides an adhesive paper 1. The adhesive paper 1 comprises a substrate 10 and an adhesive layer 20. The substrate 10 has opposite first and second surfaces 11 and 12 in a thickness direction Y thereof, and has a first side surface 13 in a first direction X, the first side surface 13 connecting the first and second surfaces 11 and 12, and the first direction X being perpendicular to the thickness direction Y of the substrate 10. The adhesive layer 20 is arranged on the first surface 11. The adhesive layer 20 comprises a main body portion 21 and a first edge portion 22, and in 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 that of the main body portion 21.

[0133] In some embodiments, the adhesive layer 20 can comprise the main body portion 21 and the 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 portion 21, and an end of the first edge portion 22 away from the first side surface 13 can be connected to an end of the main body portion 21 close to the first side surface 13.

[0134] In some embodiments, in the first direction X, an end of the first edge portion 22 away from the main body portion 21 can intersect the first side surface 13, which can be complete intersection or partial intersection.

[0135] In some embodiments, an end of the first edge portion 22 away from the main body portion 21 can not intersect the first side surface 13.

[0136] In some embodiments, in the first direction X, the thickness of each region of the first edge portion 22 can be the same.

[0137] In some embodiments, in the first direction X, the thickness of each region of the first edge portion 22 can also be different. The thickness of the first edge portion 22 can vary regularly, such as linearly or curvilinearly, or irregularly.

[0138] In some embodiments, in the first direction X, the thickness of the part of the first edge portion 22 close to the first side surface 13 can be less than that of the part of the first edge portion 22 away from the first side surface 13.

[0139] The technical scheme of the embodiment of the present application is that 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 smaller than the thickness of the main body portion 21, thereby reducing the probability of overflow of the adhesive layer 20 from the first side surface 13 of the first surface 11, reducing the risk of the adhesive paper 1 being attached to the pole piece and adhering to the separator 1103 due to overflow of the adhesive layer 20, causing metal ions to be released from the electrode assembly 110, and improving the reliability of the battery monomer 100.

[0140] Please refer to FIG. 7 and FIG. 8. In some embodiments, the base material 10 further comprises a second side surface 14, which is arranged opposite to the first side surface 13 in the first direction X. The adhesive layer 20 further comprises a second edge portion 23, which is closer to the second side surface 14 than the main body portion 21 in 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 base material 10, the thickness of the second edge portion 23 is smaller than the thickness of the main body portion 21.

[0141] 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 portion 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 portion 21 close to the second side surface 14.

[0142] In some embodiments, in the first direction X, an end of the second edge portion 23 away from the main body portion 21 can intersect with the second side surface 14, which can be complete intersection or partial intersection.

[0143] In some embodiments, an end of the second edge portion 23 away from the main body portion 21 can not intersect with the second side surface 14.

[0144] In some embodiments, in the first direction X, the thickness of each region of the second edge portion 23 can be the same.

[0145] In some embodiments, in the first direction X, each region of the second edge portion 23 can also be different. Among them, the thickness of the second edge portion 23 can have regular changes, such as linear changes, curve changes, etc., and the thickness of the second edge portion 23 can also have irregular changes.

[0146] In some embodiments, in the first direction X, the thickness of the part of the second edge portion 23 close to the second side surface 14 can be smaller than the thickness of the part of the second edge portion 23 away from the second side surface 14.

[0147] In some embodiments, in the first direction X, an end of the first edge portion 22 away from the first side surface 13 is connected to an end of the main body portion 21, and the other end of the main body portion 21 is connected to an end of the second edge portion 23 away from the second side surface 14.

[0148] In some embodiments, the boundary line of the first edge portion 22 and the main body portion 21 can be a straight line or an irregular line segment. The boundary line of the second edge portion 23 and the main body portion can be a straight line or an irregular line segment.

[0149] In some embodiments, in the thickness direction Y of the substrate 10, the thickness of the first edge portion 22 can be the same as the thickness of the second edge portion 23.

[0150] In some embodiments, in the thickness direction Y of the substrate 10, the thickness of the first edge portion 22 can be different from the thickness of the second edge portion 23.

[0151] The technical scheme of the embodiments 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 smaller than the thickness of the main body portion 21, reducing the probability of overflow of the adhesive layer 20 from the second side surface 14 of the first surface 11, reducing the risk of metal ion release of the electrode assembly 110 caused by the adhesive paper 1 attached to the pole piece, and improving the reliability of the battery monomer 100.

[0152] Please refer to FIG. 7 and FIG. 8, in some embodiments, in the first direction X, the width of the first edge portion 22 is L3, which satisfies the condition: 0.5mm≤L3≤2mm.

[0153] In some embodiments, in the first direction X, the width L3 of the first edge portion 22 satisfies the above condition, and L3 can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0154] The technical scheme of the embodiments of the present application, the width of the first edge portion 22 satisfies the above condition, which is easy to implement while reducing the probability of folding of the corresponding area of the substrate 10 to the first edge portion 22, reducing the risk of metal ion release of the electrode assembly 110 caused by the folding of the substrate 10 when the adhesive paper 1 is attached to the pole piece, and improving the reliability of the battery monomer 100.

[0155] In some embodiments, in the first direction X, the width of the first edge portion 22 is L3, which satisfies the condition: 0.8mm≤L3≤1.2mm.

[0156] In some embodiments, in the first direction X, the width L3 of the first edge portion 22 satisfies the above condition, and L3 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0157] The technical solution of the embodiment of the application is that the width of the first edge part 22 meets the above condition, which further makes the process easy to implement, reduces the risk of the base material 10 being folded to increase the stress of the diaphragm 1103 and causing the electrode assembly 110 to release metal ions when the adhesive paper 1 is attached to the pole piece, and improves the reliability of the battery monomer 100.

[0158] Please refer to FIG. 7 and FIG. 8. In some embodiments, in the first direction X, the width of the second edge part 23 is L4, which meets the condition: 0.5mm≤L4≤2mm.

[0159] In some embodiments, in the first direction X, the width L4 of the second edge part 23 meets the above condition, and L3 can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0160] The technical solution of the embodiment of the application is that the width of the second edge part 23 meets the above condition, which further makes the process easy to implement, reduces the risk of the base material 10 being folded to increase the stress of the diaphragm 1103 and causing the electrode assembly 110 to release metal ions when the adhesive paper 1 is attached to the pole piece, and improves the reliability of the battery monomer 100.

[0161] In some embodiments, in the first direction X, the width of the second edge part 23 is L4, which meets the condition: 0.8mm≤L4≤1.2mm.

[0162] In some embodiments, in the first direction X, the width L4 of the second edge part 23 meets the above condition, and L4 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0163] The technical solution of the embodiment of the application is that the width of the second edge part 23 meets the above condition, which further makes the process easy to implement, reduces the risk of the base material 10 being folded to increase the stress of the diaphragm 1103 and causing the electrode assembly 110 to release metal ions when the adhesive paper 1 is attached to the pole piece, and improves the reliability of the battery monomer 100.

[0164] Please refer to FIG. 9 and FIG. 10, FIG. 9 is a partially expanded schematic diagram of an electrode assembly provided by some embodiments of the present application, and FIG. 10 is a partially expanded schematic diagram of an electrode assembly provided by some other embodiments of the present application. In FIG. 9, the adhesive paper corresponds to the adhesive paper of the embodiments of FIG. 5 and FIG. 6, and in FIG. 10, the adhesive paper corresponds to the adhesive paper of the embodiments of FIG. 7 and FIG. 8. The embodiments of the present application also provide a battery cell 100. The battery cell 100 comprises an electrode assembly 110, and the electrode assembly 110 is in a wound structure. The electrode assembly 110 comprises a first electrode sheet 1101, a second electrode sheet 1102, and a separator 1103, the first electrode sheet 1101 and the second electrode sheet 1102 are opposite in polarity, and the separator 1103 is arranged between the first electrode sheet 1101 and the second electrode sheet 1102. At least one bent section 11011 of the first electrode sheet 1101 is attached with the adhesive paper 1 of any of the above embodiments, and the first direction X is the winding direction of the electrode assembly 110.

[0165] In some embodiments, the electrode assembly 110 is expanded along the winding direction, and the first direction X coincides with the winding direction.

[0166] In some embodiments, all the bent sections 11011 of the first electrode sheet 1101 can be attached with the adhesive paper 1.

[0167] In some embodiments, part of the bent sections 11011 of the first electrode sheet 1101 can be attached with the adhesive paper 1.

[0168] In some embodiments, the adhesive paper 1 can be attached to the first electrode sheet 1101 in such a way that the first surface 11 of the base material 10 faces the surface of the first electrode sheet 1101, and the adhesive layer 20 is attached to the first electrode sheet 1101. After the adhesive paper 1 is attached to the first electrode sheet 1101, the first electrode sheet 1101 is wound.

[0169] In some embodiments, the adhesive paper 1 can be attached to the surface of the first electrode sheet 1101 that faces the winding center.

[0170] In some embodiments, the adhesive paper 1 can be attached to the surface of the first electrode sheet 1101 that faces away from the winding center.

[0171] In some embodiments, the adhesive paper 1 can be attached to both surfaces of the first electrode sheet 1101.

[0172] In some embodiments, on part of the bent sections 11011 of the first electrode sheet 1101, the adhesive paper 1 can be attached to both surfaces of the first electrode sheet 1101, and on another part of the bent sections 11011 of the first electrode sheet 1101, the adhesive paper 1 can be attached to one surface of the first electrode sheet 1101.

[0173] When the adhesive paper 1 has the first blank area 112, the adhesive paper 1 is attached to the at least one bent section 11011 of the first electrode tab 1101. During the manufacturing process of the electrode assembly 110, due to the provision 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, thereby reducing the probability of overflow of the adhesive layer 20 from the first side surface 13, reducing the probability of flow of the adhesive layer 20 from the first side surface 13, reducing the risk of adhesion of the adhesive paper 1 to the separator 1103, thereby reducing the risk of metal ion precipitation, and improving the reliability of the battery monomer 100.

[0174] In some embodiments, the adhesive layer 20 of the adhesive paper 1 may overflow from the base material 10 in the finished electrode assembly 110, but the overflowed adhesive layer 20 is flush with the first side surface 13, or the overflowed adhesive layer 20 is small and negligible.

[0175] When the adhesive paper 1 has the first edge portion 22, the adhesive paper 1 is attached to the at least one bent section 11011 of the first electrode tab 1101. During the manufacturing process of the electrode assembly 110, due to the thickness of the first edge portion 22 of the adhesive layer 20 being smaller than the thickness of the main body portion 21, the main body portion 21 can flow to the first edge portion 22, thereby reducing the probability of overflow of the first edge portion 22 of the adhesive layer 20 from the first side surface 13, reducing the risk of adhesion of the adhesive paper 1 to the separator 1103, thereby reducing the risk of metal ion precipitation, and improving the reliability of the battery monomer 100.

[0176] In some embodiments, the first edge portion 22 of the adhesive paper 1 may overflow from the base material 10 in the finished electrode assembly 110, but the overflowed first edge portion 22 is flush with the first side surface 13, or the overflowed first edge portion 22 is small and negligible.

[0177] The technical scheme of the embodiments of the present application reduces the risk of metal ion precipitation of the electrode assembly 110 caused by the falling of the material on the surface of the first electrode tab 1101 during the formation of the electrode assembly 110, and reduces the risk of metal ion precipitation of the electrode assembly 110 caused by the overflow of the adhesive layer 20 and the adhesion of the adhesive paper 1 to the separator 1103, thereby improving the reliability of the battery monomer 100.

[0178] Please refer to FIG. 4. In some embodiments, the adhesive paper 1 is attached to both sides of the at least one bent section 11011 in the thickness direction.

[0179] In some embodiments, the thickness direction of the first electrode tab 1101 can be the thickness direction Y of the base material 10.

[0180] In some embodiments, the adhesive papers 1 attached to the two sides of the first electrode tab 1101 can be aligned at both ends.

[0181] In some embodiments, the adhesive tape 1 attached on both sides of the first tab 1101 can be aligned at one end.

[0182] In some embodiments, the adhesive tape 1 attached on both sides of the first tab 1101 can not be aligned at both ends.

[0183] The technical solution of the embodiments of the present application is that the bending section 11011 is attached with the adhesive tape 1 on both sides in the thickness direction, so that the consistency of both sides of the bending section is good, the risk of breaking of the first tab 1101 is reduced, and the risk of falling of the surface material on both sides of the bending section 11011 is reduced, thereby improving the reliability of the battery monomer 100.

[0184] Please refer to FIG. 4, in some embodiments, the bending section 11011 of the innermost circle of the first tab 1101 is attached with the adhesive tape 1.

[0185] In some embodiments, the bending section 11011 of the innermost circle of the first tab 1101 can be two, and the two bending sections 11011 are oppositely arranged relative to the winding center.

[0186] The technical solution of the embodiments of the present application is that the bending section 11011 of the innermost circle of the first tab 1101 is attached with the adhesive tape 1, which reduces the risk of metal ion release of the bending section 11011 of the innermost circle of the first tab 1101, and improves the reliability of the battery monomer 100.

[0187] In some embodiments, the first tab 1101 is a positive electrode tab.

[0188] In some embodiments, the second tab 1102 can be a negative electrode tab.

[0189] The technical solution of the embodiments of the present application is that the positive electrode tab is attached with the adhesive tape 1, which reduces the risk of falling of the material on the surface of the first tab 1101 and causing the second tab 1102 to release metal ions, thereby improving the reliability of the battery monomer 100.

[0190] The embodiments of the present application also provide a battery 200, which comprises the battery monomer 100 of any of the above embodiments.

[0191] The embodiments of the present application also provide a power consumption device, which comprises the battery monomer 100 of any of the above embodiments or the battery 200 of any of the above embodiments, and the battery monomer 100 or the battery 200 is used to provide electric energy.

[0192] Referring to FIGS. 4-10, in some embodiments, the battery cell 100 includes an electrode assembly 110, which is in a jelly-roll structure. The electrode assembly 110 includes a first electrode tab 1101, a second electrode tab 1102, and a separator 1103, the first electrode tab 1101 and the second electrode tab 1102 are opposite in polarity, and the separator 1103 is disposed between the first electrode tab 1101 and the second electrode tab 1102, the first electrode tab 1101 is a positive electrode tab. The innermost circle of the first electrode tab 1101 is provided with a piece of adhesive tape 1, and the adhesive tape 1 is attached to both sides of the first electrode tab 1101 in the thickness direction. After the electrode assembly 110 is completed, the adhesive of the adhesive tape 1 does not flow out.

[0193] The adhesive tape 1 includes a substrate 10 and an adhesive layer 20. The substrate 10 has opposite first and second surfaces 11 and 12 in the thickness direction Y thereof, and has first and second side surfaces 13 and 14 opposite to each other in the first direction X. The first side surface 13 connects the first and second surfaces 11 and 12, and the second side surface 14 connects the first and second surfaces 11 and 12. The first direction X is perpendicular to the thickness direction Y of the substrate 10. The adhesive layer 20 is disposed on the first surface 11.

[0194] In some embodiments, the first surface 11 includes a first blank area 112, a coated area 111, and a second blank area 113, which are sequentially arranged in the first direction X, the first blank area 112 is not coated with the adhesive layer 20, the coated area 111 is coated with the adhesive layer 20, and the second blank area 113 is not coated with the adhesive layer 20, the first blank area 112 connects the coated area 111 and the first side surface 13, and the second blank area 113 connects the coated area 111 and the second side surface 14. That is, when the adhesive tape 1 is attached to the first electrode tab 1101, the adhesive layer 20 does not flow out of the first blank area 112 to the first side surface 13, and the adhesive layer 20 does not flow out of the second blank area 113 to the second side surface 14.

[0195] In such a battery cell, the adhesive tape 1 has the first blank area 112 and the second blank area 113, and due to the provision 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 overflow of the adhesive layer 20 from the first side surface 13, reducing the probability of overflow of the adhesive layer 20 from the second side surface 14, reducing the risk of the adhesive tape 1 sticking to the separator 1103, thereby reducing the risk of metal ion precipitation, and improving the reliability of the battery cell 100.

[0196] In some embodiments, the adhesive layer 20 comprises a first edge portion 22, a main body portion 21 and a second edge portion 23 arranged in sequence 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 electrode sheet 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.

[0197] In such a battery cell, when the adhesive tape 1 has the first edge portion 22 and the second edge portion 23, during the manufacturing process of the electrode assembly 110, due to the thickness of the first edge portion 22 of the adhesive layer 20 being less than the thickness of the main body portion 21, the main body portion 21 can flow to the first edge portion 22, or the adhesive layer 20 can be flush with the first side surface 13, thereby reducing the probability of the first edge portion 22 of the adhesive layer 20 flowing out from the first side surface 13, and due to the thickness of the second edge portion 23 of the adhesive layer 20 being less than the thickness of the main body portion 21, the main body portion 21 can flow to the second edge portion 23, or the adhesive layer 20 can be flush with the second side surface 14, thereby reducing the probability of the second edge portion 23 of the adhesive layer 20 flowing out from the second side surface 14, reducing the risk of the adhesive tape 1 adhering to the separator 1103, thereby reducing the risk of metal ion precipitation, and improving the reliability of the battery cell 100.

[0198] The technical scheme of the embodiments of the present application attaches the adhesive tape 1 to the first electrode sheet 1101, reduces the probability of the adhesive layer 20 overflowing, reduces the risk of the adhesive tape 1 being attached to the electrode sheet due to the adhesive layer 20 overflowing and adhering to the separator 1103, causing the electrode assembly 110 to precipitate metal ions, and improves the reliability of the battery cell 100.

[0199] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. 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 having a first surface and a second surface opposite to each other in a thickness direction thereof, the substrate having a first side surface in a first direction connecting the first surface and the second surface, the first direction being 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 any one of claims 1 to 2, 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 having a first surface and a second surface opposite to each other in a thickness direction thereof, the substrate having a first side surface in a first direction connecting the first surface and the second surface, the first direction being perpendicular to the thickness direction of the substrate; an adhesive layer, 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 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, wherein 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 any one of claims 7 to 8, 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 wound structure, the electrode assembly comprising a first electrode piece, a second electrode piece, and a diaphragm, the first electrode piece and the second electrode piece having opposite polarities, and the diaphragm being disposed between the first electrode piece and the second electrode piece; Wherein, at least one bending section of the first electrode sheet is affixed with the adhesive tape according to 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 of the bending sections in the thickness direction.

13. The battery cell according to any one of claims 11 to 12, characterized in that: The adhesive tape is attached to the innermost bending section of the first pole piece.

14. The battery cell according to any one of claims 11 to 13, characterized in that: The first electrode is a positive electrode.

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

16. An electrical device, characterized in that: The method 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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