Battery cell, battery, and electrical device

Abstract

Embodiments of the present application provide a battery cell, a battery, and an electrical device. The battery cell comprises an electrode assembly and an adhesive tape, the electrode assembly comprises a first electrode sheet, and the adhesive tape is attached to the first electrode sheet. The adhesive tape comprises a base material and an adhesive layer, the base material is provided with a first surface in the thickness direction of the base material, and the adhesive layer is arranged on the first surface. The base material is a porous material, and the first surface comprises an adhesive applying area coated with the adhesive layer and a blank area not coated with the adhesive layer. According to the technical solution provided by the present application, the battery cell can have both high reliability and high energy density.

Description

Battery cell, battery and electric device Cross-reference to related applications

[0001] The present application claims priority to Chinese Patent Application No. 202420724301.8, filed on April 9, 2024, entitled “Battery cell, 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 batteries, in particular to a battery cell, 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 manufacturing process of the battery, the reliability and energy density of the battery cell are a problem that cannot be ignored. Therefore, how to balance the reliability and energy density of the battery cell is a technical problem that needs to be solved in the battery technology. SUMMARY

[0005] The present application provides a battery cell, a battery and an electric device, which can make the battery cell have high reliability and high energy density at the same time.

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

[0007] In a first aspect, the present application provides a battery cell, which comprises an electrode assembly and a gum paper, the electrode assembly comprising a first electrode sheet, and the gum paper being attached to the first electrode sheet. The gum paper comprises a base material and a glue layer, the base material having a first surface in the thickness direction thereof, and the glue layer being arranged on the first surface; wherein the base material is a porous material, and the first surface comprises a glue-coated area coated with the glue layer and a blank area not coated with the glue layer.

[0008] In the technical scheme of the embodiment of the present application, the first surface of the base material of the adhesive tape includes a coating area coated with a glue layer, and the glue layer of the coating area can realize the bonding of the adhesive tape on the first pole piece, thereby protecting the first pole piece and reducing the risk of cracking or powdering of the first pole piece, thereby reducing the risk of the diaphragm being punctured in the cycle process of the battery monomer, causing the positive and negative electrodes to be in contact and short-circuit. The base material is made of a porous material, and the first surface of the base material has a blank area which is not coated with a glue layer. In the charging and discharging process of the battery monomer, active ions (such as lithium ions) can normally pass through the blank area of the adhesive tape which is not provided with a glue layer. Compared with the case where the glue layer is fully applied to the first surface of the base material, the area through which the active ions pass through the adhesive tape is increased, and the blocking effect of the adhesive tape on the movement of the active ions is reduced, so that the capacity of the area of the battery monomer to which the adhesive tape is attached can be normally exerted, and the battery monomer has a high energy density. On the other hand, since the active ions can normally pass through the adhesive tape, the active ions are less likely to accumulate at the edge of the adhesive tape, thereby reducing the risk of metal ions being deposited on the surface of the negative electrode.

[0009] According to some embodiments of the present application, the glue layer includes a plurality of sub-glue layers, and the plurality of sub-glue layers are arranged at intervals along a first direction on the base material to form a blank area between adjacent two sub-glue layers, and the first direction is perpendicular to the thickness direction of the base material.

[0010] In the above scheme, the plurality of sub-glue layers are arranged at intervals along the first direction on the base material, that is, the plurality of sub-glue layers are distributed in a strip shape on the base material. On the one hand, the bonding point positions of the adhesive tape and the pole piece of the battery monomer are uniformly distributed, ensuring the adhesion of the adhesive tape and the pole piece. On the other hand, the blank areas between adjacent two sub-glue layers are also arranged at intervals on the base material, which is beneficial to the active ions in the battery monomer to pass through the blank areas nearby, reducing the blocking effect of the adhesive tape on the movement of the active ions, so that the capacity of the adhesive area of the battery monomer can be normally exerted.

[0011] According to some embodiments of the present application, the extension direction of each sub-glue layer intersects the width direction of the base material, and the extension direction of each sub-glue layer intersects the length direction of the base material.

[0012] In the above scheme, by making the extension direction of the sub-glue layer intersect the width direction of the base material, and the extension direction of each sub-glue layer intersect the length direction of the base material, that is, the plurality of sub-glue layers are arranged at intervals in a diagonal direction on the first surface of the base material. In the coating process of the adhesive tape, the contact point positions of the adhesive equipment and the base material are increased, so that the glue pulling roller of the adhesive machine can fully contact the glue layer part of the adhesive tape, facilitating the glue pulling roller to pull the adhesive tape, and avoiding the failure of glue pulling caused by uneven coating of the gap coating glue layer.

[0013] According to some embodiments of the present application, the thickness of the sub-glue layer is not less than 0.5 um and not more than 8 um.

[0014] In the above scheme, by limiting the thickness of the adhesive layer in the range, both the adhesion of the adhesive paper can be ensured, and the waste of adhesive layer material can be avoided. When the thickness of the adhesive layer is less than 0.5 um, the adhesive layer is thin, which can affect the adhesion of the adhesive paper. When the thickness of the adhesive layer is greater than 8 um, the thickness of the adhesive layer is thick, which causes waste of adhesive layer material.

[0015] According to some embodiments of the present application, the electrode assembly is a winding structure, and the electrode assembly further comprises a second pole piece and a separator, the first pole piece and the second pole piece are opposite in polarity, and the separator is arranged between the first pole piece and the second pole piece; wherein the adhesive paper is attached to at least one bending segment of the first pole piece.

[0016] In the above scheme, during the shaping process of the battery monomer, the first pole piece of the battery monomer is prone to cracking and powdering at the bending segment under pressure. The adhesive paper can be attached to at least one bending segment of the first pole piece through the adhesive area of the adhesive paper. On the one hand, the adhesive paper can protect the bending segment of the first pole piece, reducing the risk of cracking and powdering in the area of the first pole piece attached with the adhesive paper, thereby ensuring that the battery monomer will not have the case of cracking pole piece piercing the separator during the cycle process. On the other hand, the base material of the adhesive paper is a porous material, and the first surface of the base material has a blank area without an adhesive layer. In this way, during the charging and discharging process of the battery monomer, active ions (such as lithium ions) can normally pass through the blank area without an adhesive layer on the adhesive paper. Compared with full-paving the adhesive layer on the first surface of the base material, the area for active ions to pass through the adhesive paper is increased, and the blocking effect of the adhesive paper on the movement of active ions is reduced, thereby enabling the capacity of the area of the battery monomer attached with the adhesive paper to be normally exerted. Since the active ions can normally pass through the adhesive paper, the active ions are less likely to accumulate at the edge of the adhesive paper, thereby reducing the risk of lithium precipitation of the battery monomer.

[0017] In the technical scheme of the embodiments of the present application, the two sides of the at least one bending segment of the first pole piece in the thickness direction are attached with adhesive paper.

[0018] In the above scheme, by attaching adhesive paper to both sides of the at least one bending segment of the first pole piece in the thickness direction, the bending segment of the first pole piece is protected by adhesive paper on both sides in the thickness direction, the compression resistance of both sides of the bending segment of the pole piece is relatively more balanced, the pole piece is less likely to crack, the safety of the battery monomer is ensured, and the risk of lithium precipitation is reduced.

[0019] According to some embodiments of the present application, the adhesive paper is attached to the bending segment of the innermost circle of the first pole piece.

[0020] In the above scheme, when the battery monomer is shaped, the innermost bending section of the first pole piece is folded the most, and the first pole piece is more prone to cracking and powdering. Therefore, the innermost bending section of the first pole piece is pasted with adhesive paper, thereby protecting the innermost bending section of the first pole piece, and reducing the risk of cracking and powdering of the first pole piece.

[0021] According to some embodiments of the present application, the first pole piece is a positive pole piece.

[0022] According to some embodiments of the present application, the adhesive paper includes a first adhesive paper and a second adhesive paper, and the first adhesive paper and the second adhesive paper are respectively arranged on both sides of the thickness direction of the innermost bending section of the first pole piece; along the width direction of the first pole piece, the first adhesive paper has a first end portion and a second end portion which protrude out of the first pole piece, and the second adhesive paper has a third end portion and a fourth end portion which protrude out of the first pole piece, and the first end portion is connected with the third end portion, and the second end portion is connected with the fourth end portion.

[0023] In the above scheme, the first end portion is connected with the third end portion, and the second end portion is connected with the fourth end portion, so that the portions of the first adhesive paper and the second adhesive paper which protrude out of the first pole piece are connected as a whole, thereby improving the connection strength of the adhesive paper and the first pole piece, and the adhesive paper is not prone to falling off the first pole piece.

[0024] According to some embodiments of the present application, along the thickness direction of the first pole piece, the adhesive paper has a first region which overlaps the first pole piece, and the ratio of the area of the adhesive layer in the first region to the area of the first region is not less than 10% and not more than 85%.

[0025] In the above scheme, the ratio of the area of the adhesive layer in the first region to the area of the first region is limited in the range, which can ensure that the active ions pass through the adhesive paper well, and the adhesive paper has sufficient bonding capacity. When the ratio of the area of the adhesive layer in the first region to the area of the first region is less than 10%, the coverage area of the adhesive layer is small, and the bonding strength of the adhesive paper is not enough to affect the bonding stability of the adhesive paper and the first pole piece. When the ratio of the area of the adhesive layer in the first region to the area of the first region is greater than 85%, the coverage area of the adhesive layer is too large, which is not conducive to the active ions passing through the adhesive paper, affects the capacity of the battery monomer, and the battery monomer is prone to lithium precipitation.

[0026] In a second aspect, the present application provides a battery including the battery monomer in the above embodiments.

[0027] In a third aspect, the present application provides a power-using device including the battery monomer in the above embodiments or the battery in the above embodiments, and the battery monomer or the battery is used to provide electric energy.

[0028] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used 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 present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0031] FIG. 2 is an exploded structural schematic diagram of a battery according to some embodiments of the present application;

[0032] FIG. 3 is a structural schematic diagram of a tape according to some embodiments of the present application;

[0033] FIG. 4 is a structural schematic diagram of the tape being attached to a first electrode tab according to some embodiments of the present application;

[0034] FIG. 5 is a structural schematic diagram of multiple sub-gel layers in the tape being distributed along the length direction of the substrate according to some embodiments of the present application;

[0035] FIG. 6 is a structural schematic diagram of multiple sub-gel layers in the tape being distributed along the width direction of the substrate according to some embodiments of the present application;

[0036] FIG. 7 is a structural schematic diagram of multiple sub-gel layers in the tape being distributed in a dot-like manner on the substrate according to some embodiments of the present application;

[0037] FIG. 8 is a cross-sectional structural schematic diagram of an electrode assembly in a battery cell according to some embodiments of the present application;

[0038] FIG. 9 is a structural schematic diagram of a first tape and a second tape being attached to both sides of the first electrode tab in the thickness direction according to some embodiments of the present application.

[0039] In the drawings, the drawings are not drawn according to the actual scale.

[0040] Label description: 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-box body; 11-first part; 12-second part; 20-battery cell; 22-electrode assembly; 221-first tab; 2210-first lug; 2211-first bent section; 2212-second bent section; 222-second tab; 23-adhesive paper; 231-substrate; 2311-first surface; 2312-gluing area; 2313-marginal space; 232-first adhesive paper; 2321-first end; 2322-second end; 233-second adhesive paper; 2331-third end; 2332-fourth end; 234-adhesive layer; 2341-sub-adhesive layer; 24-separator. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0043] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0044] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The term "and / or" in the present application is only to describe the association relationship of 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 present application generally represents that the front and rear associated objects have an "or" relationship.

[0046] "Multiple" appearing in the present application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0047] 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.

[0048] 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.

[0049] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0050] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0051] In the embodiments of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0052] The battery monomer 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, etc.

[0053] As an example, the battery monomer can be a cylindrical battery monomer, a prismatic battery monomer, a soft package battery monomer, or a battery monomer of other shapes, and the prismatic battery monomer includes a square can battery monomer.

[0054] A battery cell generally includes an electrode assembly. The electrode assembly includes a cathode, an anode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the cathode and the anode. The separator is disposed between the cathode and the anode, and can function to prevent short circuiting of the cathode and the anode while allowing the active ions to pass through.

[0055] In some embodiments, the cathode can be a cathode tab, which can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0056] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two surfaces of the cathode current collector.

[0057] As an example, the cathode 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, or the like can be used. The composite current collector can include a polymer material substrate 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, or the like) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0058] As an example, the cathode 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 cathode active material for a battery can also be used.

[0059] In some embodiments, the anode can be an anode tab, which can include an anode current collector.

[0060] As an example, the anode 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, or the like can be used.

[0061] In some embodiments, the anode current collector has two surfaces opposite in the thickness direction thereof, and the anode active material is disposed on either one or both of the two surfaces of the anode current collector.

[0062] As an example, the negative active material can employ a negative active material for a battery that is publicly known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. 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 negative active material for a battery can also be used. These negative active materials can be used alone or in combination of two or more.

[0063] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0064] 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. In the case of 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.

[0065] 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.

[0066] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound to form the wound structure.

[0067] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydraulic, thermal, wind and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0068] The development of battery technology needs to consider many design factors, such as energy density, charge and discharge rate and other performance parameters, in addition, the discharge capacity of the battery also needs to be considered.

[0069] At present, the electrode assembly of the winding type is prone to cracking and powdering during the shaping process. In order to alleviate the problem of cracking and powdering of the electrode sheet, the existing technology usually adopts the method of pasting adhesive tape on the electrode sheet of the electrode assembly, especially on the bending section of the electrode sheet, to solve the problem of cracking and powdering of the bending section of the electrode sheet due to pressure. However, the presence of the adhesive tape on the electrode sheet can easily affect the penetration of active ions, thereby affecting the capacity of the battery monomer and reducing the capacity of the battery.

[0070] Based on the above considerations, in order to balance the capacity and reliability of the battery monomer, the present application designs a battery monomer, which comprises an electrode assembly and an adhesive tape, the adhesive tape is pasted on the first electrode sheet of the electrode assembly, the base material of the adhesive tape is a porous material, the surface of the base material has a glue layer, the base material is bonded to the first electrode sheet through the glue layer of the glue area, and the surface of the base material forms a blank area, that is, the blank area is not coated with a glue layer.

[0071] The adhesive tape can be pasted on the first electrode sheet of the electrode assembly through the glue layer of the glue area, thereby protecting the first electrode sheet and reducing the risk of cracking or powdering of the first electrode sheet, thereby reducing the risk of the diaphragm being punctured and causing the positive and negative electrodes to be short-circuited during the cycle process of the battery monomer. The base material of the adhesive tape is made of a porous material, and the first surface of the base material has a blank area which is not coated with a glue layer.

[0072] In this way, during the charging and discharging process of the battery monomer, active ions (such as lithium ions) can normally penetrate the blank area of the adhesive tape which is not provided with a glue layer. Compared with the case where the glue layer is fully applied to the surface of the base material, on the one hand, the area through which the active ions pass through the adhesive tape is increased, and the blocking effect of the adhesive tape on the movement of the active ions is reduced, thereby enabling the capacity of the area of the battery monomer with the adhesive tape to be normally exerted, and the battery monomer has a high energy density. On the other hand, since the active ions can normally penetrate the adhesive tape, the active ions are less likely to accumulate at the edge of the adhesive tape, thereby reducing the risk of metal ions being deposited on the surface of the negative electrode sheet.

[0073] The battery monomer disclosed in the embodiments of the present application can be used in, but is not limited to, electric equipment such as vehicles, ships or aircraft. The power supply system of the electric equipment can be composed of the battery monomer and the battery disclosed in the present application.

[0074] The embodiments of the present application provide a power consumption device using a battery as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0075] The following embodiments are described by taking a vehicle as an example for convenience of illustration.

[0076] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 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 automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0077] In some embodiments of the present application, the battery 100 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, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Referring to FIG. 2, FIG. 2 is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, and the first part 11 and the second part 12 are mutually covered. The first part 11 and the second part 12 jointly define a containing space for containing the battery monomer 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which is covered on the open side of the second part 12 to jointly define the containing space with the second part 12. The first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0079] In the battery 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery 100 can also be in the form of a battery module in which the multiple battery cells 20 are connected in series, in parallel, or in a mixed manner, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole and are accommodated in the case 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting member for electrically connecting the multiple battery cells 20.

[0080] Each of the battery cells 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery.

[0081] The battery cell 20 refers to the smallest unit of the battery. The battery cell 20 includes an end cover, a housing, an electrode assembly, and other functional components.

[0082] The end cover refers to a component that covers the opening of the housing to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cover can be adapted to the shape of the housing to fit the housing. Alternatively, the end cover can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover is not easily deformed when subjected to extrusion and impact, and the battery cell can have higher structural strength and reliability. The end cover can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly for outputting or inputting the electrical energy of the battery cell 20. The material of the end cover can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cover, which can be used to isolate the electrical connection components in the housing from the end cover to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0083] The electrode assembly is a component in which electrochemical reactions occur in the battery cell 20. The housing can contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion of active material constituting the main body of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet without active material each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body, respectively.

[0084] The embodiments of the present application provide a battery cell. Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the structure of the adhesive tape in some embodiments of the present application; Figure 4 is a schematic diagram of the structure of the adhesive tape attached to the first pole piece in some embodiments of the present application. The adhesive tape shown in Figure 3 is in a state before processing and cutting. The battery cell 20 includes an electrode assembly 22 and adhesive tape 23. The electrode assembly 22 includes a first pole piece 221. The adhesive tape 23 is attached to the first pole piece 221. The adhesive tape 23 includes a substrate 231 and an adhesive layer 234. The substrate 231 has a first surface 2311 in its thickness direction. The adhesive layer 234 is arranged on the first surface 2311. Among them, the substrate 231 is a porous material, and the first surface 2311 includes a glue-coated area 2312 coated with the adhesive layer 234 and a blank area 2313 not coated with the adhesive layer 234.

[0085] The substrate 231 can be any known porous structure with good chemical and mechanical stability. For example, the substrate 231 can be made of polypropylene, polyethylene, or non-woven fabric, and the adhesive layer 234 can be made of maleic anhydride-modified polypropylene, acrylic adhesive, or swelling adhesive.

[0086] The first surface 2311 of the substrate 231 is the entire surface along the thickness direction of the substrate 231 . The glue-coated area 2312 refers to all areas on the substrate 231 coated with the glue layer 234 , and the blank area 2313 is the area on the first surface 2311 of the substrate 231 not coated with the glue layer 234 .

[0087] The blank area 2313 on the first surface 2311 of the substrate 231 can have various forms. For example, the adhesive layer 234 can include multiple sub-adhesive layers 2341, which are spaced apart in strips on the first surface 2311 of the substrate. The area between two adjacent sub-adhesive layers 2341 forms the blank area 2313. Of course, the adhesive layer 234 can also be applied to the first surface 2311 of the substrate 231 in a dotted pattern, a "田" pattern, a "井" pattern, or any other shape. It is only necessary to ensure that the first surface 2311 of the substrate 231 has a blank area 2313 where the adhesive layer 234 is not applied. Figure 7 illustrates a schematic diagram of the structure of multiple sub-adhesive layers distributed in a dotted pattern on the substrate.

[0088] In the technical solution of the embodiment of the present application, the first surface 2311 of the substrate 231 of the adhesive paper 23 includes a glue-coated area 2312 coated with an adhesive layer 234. The adhesive layer 234 of the glue-coated area 2312 can be used to adhere the adhesive paper 23 to the first pole piece 221, thereby protecting the first pole piece 221 and reducing the risk of cracking or powdering of the first pole piece 221, thereby reducing the risk of the diaphragm 24 of the battery cell 20 being punctured during the cycle, thereby reducing the risk of the positive and negative poles being short-circuited.

[0089] In some embodiments, the substrate 231 is porous, and the first surface 2311 of the substrate 231 has a blank area 2313 without the adhesive layer 234. In this way, during the charging and discharging of the battery cell 20, active ions (e.g., lithium ions) can normally pass through the blank area 2313 of the adhesive paper 23 without the adhesive layer 234. Compared with the case where the adhesive layer 234 is fully applied on the first surface 2311 of the substrate 231, the area through which the active ions pass through the adhesive paper 23 is increased, and the blocking effect of the adhesive paper 23 on the movement of the active ions is reduced. As a result, the capacity of the area of the battery cell to which the adhesive paper 23 is attached can be normally exerted, and the battery cell 20 has a higher energy density. On the other hand, since the active ions can normally pass through the adhesive paper 23, the active ions are less likely to accumulate at the edge of the adhesive paper 23, thereby reducing the risk of metal ions being deposited on the surface of the negative electrode plate.

[0090] It should be noted that, in the case where the first surface 2311 of the substrate 231 is fully applied with the adhesive layer 234, the adhesive layer 234 on the substrate 231 will block the active ions, and the active ions are less likely to pass through the adhesive paper 23, thereby affecting the capacity of the battery cell. In addition, the adhesive layer 234 on the adhesive paper 23 blocks the active ions, and the active ions are more likely to accumulate or accumulate at the edge of the adhesive paper 23, thereby increasing the risk of metal ions being deposited on the surface of the negative electrode plate.

[0091] According to some embodiments of the present application, the adhesive layer 234 includes a plurality of sub-adhesive layers 2341, and the plurality of sub-adhesive layers 2341 are arranged on the substrate 231 along a first direction to form a blank area 2313 between adjacent two sub-adhesive layers 2341, and the first direction is perpendicular to the thickness direction of the substrate 231.

[0092] As shown in FIGS. 3, 5 and 6, the first direction can be any direction perpendicular to the thickness direction of the substrate 231, such as the length direction Y of the substrate 231, the width direction X of the substrate 231, or the direction intersecting with the length direction Y and / or the width direction X of the substrate 231. FIG. 3 shows that the plurality of sub-adhesive layers are arranged obliquely on the substrate, FIG. 5 shows a structure schematic view of the plurality of sub-adhesive layers arranged along the length direction Y of the substrate, and FIG. 6 shows a structure schematic view of the plurality of sub-adhesive layers arranged along the width direction X of the substrate.

[0093] The more the number of the sub-adhesive layers 2341, the more the adhesive points of the adhesive paper 23 and the first pole piece 221, and the stronger the adhesive strength of the adhesive paper 23 and the first pole piece 221. The blank area 2313 is formed between the adjacent two sub-adhesive layers 2341 on the substrate 231. Since the blank area 2313 has no adhesive layer 234, and the substrate 231 is a porous material, the active ions can normally pass through the blank area 2313 on the adhesive paper 23, ensuring the area of the active ions passing through the adhesive paper 23, reducing the blocking effect of the adhesive paper 23 on the movement of the active ions, and enabling the capacity of the adhesive area of the battery monomer 20 to be normally played.

[0094] The plurality of sub-adhesive layers 2341 are arranged in the first direction on the substrate 231, that is, the plurality of sub-adhesive layers 2341 are distributed in a strip shape on the substrate 231. On the one hand, the adhesive points of the adhesive paper 23 and the pole piece of the battery monomer are uniformly distributed, ensuring the adhesion of the adhesive paper 23 and the pole piece. On the other hand, the blank area 2313 formed between the adjacent two sub-adhesive layers 2341 is also spaced apart on the substrate 231, which is beneficial to the active ions in the battery monomer to pass through the blank area 2313 nearby, reducing the blocking effect of the adhesive paper 23 on the movement of the active ions, and enabling the capacity of the adhesive area of the battery monomer to be normally played.

[0095] According to some embodiments of the present application, the extension direction of each sub-adhesive layer 2341 intersects the width direction of the substrate 231, and the extension direction of each sub-adhesive layer 2341 intersects the length direction of the substrate 231.

[0096] The shape of the sub-adhesive layer 2341 is a strip shape, which is coated on the first surface 2311 of the substrate 231. In the plurality of sub-adhesive layers 2341, the extension direction of a part of the sub-adhesive layers 2341 can intersect the length direction of the substrate 231, and a part of the sub-adhesive layers 2341 can intersect the width direction of the substrate 231.

[0097] By intersecting the extension direction of the sub-adhesive layer 2341 and the width direction of the substrate 231, the extension direction of each sub-adhesive layer 2341 intersects the length direction of the substrate 231, that is, the plurality of sub-adhesive layers 2341 are distributed in a diagonal direction on the first surface 2311 of the substrate 231. In the coating process of the adhesive paper 23, the contact points of the adhesive equipment and the substrate 231 are increased, so that the glue pulling roller of the adhesive machine can fully contact the adhesive layer 234 of the adhesive paper 23, facilitating the glue pulling roller to pull the adhesive paper 23, and avoiding the glue pulling failure caused by the non-uniformity of the gap coating of the adhesive layer 234.

[0098] According to some embodiments of the present application, the thickness of the sub-adhesive layer 2341 is not less than 0.5 um and not greater than 8 um.

[0099] When the adhesive paper 23 is applied to the battery cell, the thickness of the sub-adhesive layer 2341 has an impact on the adhesion of the adhesive paper 23 and also has an impact on the blocking of metal ions. When the thickness of the sub-adhesive layer 2341 is less than 0.5 um, the adhesion of the adhesive paper 23 is easily affected, and when the thickness of the sub-adhesive layer 2341 is greater than 8 um, the thickness of the sub-adhesive layer 2341 is relatively thick, and the blocking of metal ions is stronger, and the risk of precipitation of metal ions is more likely to occur.

[0100] By limiting the thickness of the adhesive layer 234 to the range, the adhesion of the adhesive paper 23 can be ensured, and the waste of the material of the adhesive layer 234 can be avoided. When the thickness of the adhesive layer 234 is less than 0.5 um, the adhesive layer 234 is relatively thin, and the adhesion of the adhesive paper 23 is easily affected, and when the thickness of the adhesive layer 234 is greater than 8 um, the thickness of the adhesive layer 234 is relatively thick, and the material of the adhesive layer 234 is wasted.

[0101] According to some embodiments of the present application, please refer to FIG. 8, which is a schematic diagram of the cross-sectional structure of the electrode assembly in the battery cell according to some embodiments of the present application. The electrode assembly 22 is a winding structure, and the electrode assembly 22 further includes a second electrode tab 222 and a separator 24. The first electrode tab 221 and the second electrode tab 222 are opposite in polarity, and the separator 24 is arranged between the first electrode tab 221 and the second electrode tab 222. At least one bending section of the first electrode tab 221 is attached with the adhesive paper 23.

[0102] The electrode assembly 22 is a winding structure, and the winding structure is formed by winding of a fixed winding needle. The first electrode tab 221 and the second electrode tab 222 are one of a positive electrode tab and a negative electrode tab. The separator 24 is arranged between the first electrode tab 221 and the second electrode tab 222, which can prevent the first electrode tab 221 and the second electrode tab 222 from short-circuiting and can also allow active ions to pass through. The first electrode tab 221 includes a first electrode lug 2210. The main body of the electrode assembly 22 includes a straight section and a bending section, and the bending section is connected to one end of the straight section. The first electrode tab 221 of the straight section extends along a straight trajectory, and the electrode tab of the bending section extends along a bending trajectory.

[0103] During the shaping process of the battery cell, the first electrode tab 221 of the battery cell 20 is prone to cracking and powdering at the bending section under pressure. The adhesive area 2312 of the adhesive paper 23 can be attached to at least one bending section of the first electrode tab 221. On the one hand, the adhesive paper 23 can protect the bending section of the first electrode tab 221, thereby reducing the risk of cracking and powdering in the area of the first electrode tab 221 attached with the adhesive paper 23, and thus reducing the risk of the separator 24 being punctured and causing the positive and negative electrodes to contact and short-circuit during the cycling process of the battery cell 20.

[0104] In another aspect, the base material 231 of the adhesive paper 23 is a porous material, and the first surface 2311 of the base material 231 has a blank area 2313 that is not coated with the adhesive layer 234. In this way, during the charging and discharging of the battery monomer 20, active ions (such as lithium ions) can normally pass through the blank area 2313 of the adhesive paper 23 that is not provided with the adhesive layer 234. Compared with the case where the adhesive layer 234 is fully applied to the first surface 2311 of the base material 231, the area through which the active ions pass through the adhesive paper 23 is increased, and the blocking effect of the adhesive paper 23 on the movement of the active ions is reduced, so that the capacity of the area of the battery monomer 20 to which the adhesive paper 23 is attached can be normally exerted, and the battery monomer 20 has a higher energy density. Since the active ions can normally pass through the adhesive paper 23, the active ions are less likely to accumulate at the edge of the adhesive paper 23, thereby reducing the risk of metal ions being precipitated on the surface of the negative electrode tab.

[0105] The adhesive paper 23 can be attached to one side of the corresponding bending segment of the first tab 221, or can be attached to both sides of the corresponding bending segment of the first tab 221 in the thickness direction. When the adhesive paper 23 is attached to one side of the first tab 221, it is preferable to be attached to the inner side of the first tab 221, which can further reduce the risk of lithium precipitation. However, the outer side of the first tab 221 is prone to uneven pressure, which can cause the outer side of the first tab 221 to crack more easily.

[0106] In the technical solution of the embodiments of the present application, the adhesive paper 23 is attached to both sides of the at least one bending segment in the thickness direction.

[0107] By attaching the adhesive paper 23 to both sides of the at least one bending segment in the thickness direction, the bending segment of the first tab 221 is protected by the adhesive paper 23 on both sides, and the pressure resistance of the two sides of the bending segment of the first tab 221 is relatively more balanced, so that the first tab 221 is less likely to crack, ensuring the safety of the battery monomer 20 and reducing the risk of lithium precipitation.

[0108] According to some embodiments of the present application, the adhesive paper 23 is attached to the bending segments of the innermost circle of the first tab 221.

[0109] When the electrode assembly is wound, the bending segments of the innermost circle of the first tab 221 in the electrode assembly 22 are subjected to the greatest stress and have the greatest folding amount, and the bending segments of the innermost circle are the most prone to cracking and powdering. In the present embodiment, the adhesive paper 23 is provided on the first bending segment 2211 and the second bending segment 2212 of the innermost circle of the first tab 221, that is, the first bending segment 2211 and the second bending segment 2212 are the two bending segments formed by the first winding of the first tab 221 when it is wound.

[0110] The innermost circle of the first pole piece 221 is pasted with the adhesive tape 23, so as to protect the innermost circle of the first pole piece 221, thereby reducing the risk of cracking and powdering of the first pole piece 221.

[0111] According to some embodiments of the present application, the first pole piece 221 is a positive pole piece.

[0112] According to some embodiments of the present application, please refer to FIG. 9, which is a structural schematic diagram of the first adhesive tape and the second adhesive tape pasted on both sides of the first pole piece in the thickness direction of the first pole piece according to some embodiments of the present application. The adhesive tape 23 includes a first adhesive tape 232 and a second adhesive tape 233, which are respectively arranged on both sides of the innermost circle of the first pole piece 221 in the thickness direction. Along the width direction X of the first pole piece 221, the first adhesive tape 232 has a first end portion 2321 and a second end portion 2322 which exceed the first pole piece 221, and the second adhesive tape 233 has a third end portion 2331 and a fourth end portion 2332 which exceed the first pole piece 221, the first end portion 2321 is connected with the third end portion 2331, and the second end portion 2322 is connected with the fourth end portion 2332.

[0113] The first end portion 2321 refers to one end of the first adhesive tape 232 in the width direction X, and the second end portion 2322 refers to the other end of the first adhesive tape 232 opposite to the first end portion 2321 in the width direction X, and the first end portion 2321 and the second end portion 2322 are respectively located at both ends of the first adhesive tape 232 in the width direction X. Similarly, the third end portion 2331 refers to one end of the second adhesive tape 233 in the width direction X, and the fourth end portion 2332 refers to the other end of the second adhesive tape 233 opposite to the third end portion 2331 in the width direction X, and the third end portion 2331 and the fourth end portion 2332 are respectively located at both ends of the second adhesive tape 233 in the width direction X.

[0114] The connection mode of the first end portion 2321 and the third end portion 2331 can be adhesion, or other modes such as ultrasonic welding, or by threading a fixing member at the overlapping part of the first end portion 2321 and the third end portion 2331 of the first adhesive tape 232 and the second adhesive tape 233, and connecting the first adhesive tape 232 and the second adhesive tape 233 by the fixing member. Similarly, the connection mode of the second end portion 2322 and the fourth end portion 2332 can be adhesion, or other modes such as ultrasonic welding, or by threading a fixing member at the overlapping part of the second end portion 2322 and the fourth end portion 2332 of the first adhesive tape 232 and the second adhesive tape 233, and connecting the first adhesive tape 232 and the second adhesive tape 233 by the fixing member.

[0115] The first end portion 2321 is connected with the third end portion 2331, and the second end portion 2322 is connected with the fourth end portion 2332, so that the portions of the first adhesive paper 232 and the second adhesive paper 233 extending out of the first pole piece 221 are connected as a whole, thereby improving the connection strength of the adhesive paper 23 and the first pole piece 221 and reducing the possibility of the adhesive paper 23 and the first pole piece 221 being separated.

[0116] According to some embodiments of the present application, along the thickness direction of the first pole piece 221, the adhesive paper 23 has a first region overlapping the first pole piece 221, and the ratio of the area of the adhesive layer 234 located in the first region to the area of the first region is not less than 10% and not greater than 85%.

[0117] The ratio of the area of the adhesive layer 234 located in the first region to the area of the first region can be any value within the range of 10%-85%, for example, the ratio of the area of the adhesive layer 234 located in the first region to the area of the first region can be 10%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85%, etc.

[0118] Limiting the ratio of the area of the adhesive layer 234 located in the first region to the area of the first region within the range can ensure that the active ions pass through the adhesive paper 23 well and that the adhesive paper 23 has sufficient bonding capacity. When the ratio of the area of the adhesive layer 234 located in the first region to the area of the first region is less than 10%, the coverage area of the adhesive layer 234 is small, which can affect the bonding stability of the adhesive paper 23 and the first pole piece 221 due to insufficient bonding strength of the adhesive paper 23. When the ratio of the area of the adhesive layer 234 located in the first region to the area of the first region is greater than 85%, the coverage area of the adhesive layer 234 is too large, which is not conducive to the active ions passing through the adhesive paper 23, affects the capacity of the battery cell, and the battery cell is prone to the phenomenon of metal ions being deposited on the surface of the negative pole piece.

[0119] The present application provides a battery including the battery cell in the above embodiments.

[0120] The present application provides a power-using device including the battery cell in the above embodiments or the battery in the above embodiments, and the battery cell or the battery is used to provide electric energy.

[0121] According to some embodiments of the present application, referring to FIGS. 3 and 4, the battery cell includes an electrode assembly 22, the electrode assembly 22 is in a winding structure, the electrode assembly 22 includes a first electrode tab 221, a second electrode tab 222 and a separator 24, the first electrode tab 221 and the second electrode tab 222 are opposite in polarity, and the separator 24 is arranged between the first electrode tab 221 and the second electrode tab 222; an adhesive tape 23 is attached to at least one bending section of the first electrode tab 221, the adhesive tape 23 includes a base material 231 and an adhesive layer 234, and the base material 231 has a first surface 2311 in a thickness direction thereof; the adhesive layer 234 is arranged on the first surface 2311; wherein the base material 231 is of a porous material, and the first surface 2311 includes a coated area 2312 coated with the adhesive layer 234 and a blank area 2313 not coated with the adhesive layer 234.

[0122] By the first surface 2311 of the base material 231 of the adhesive tape 23 including the coated area 2312 coated with the adhesive layer 234, the adhesive layer 234 of the coated area 2312 can realize the adhesive tape 23 being bonded to the electrode tab, and can protect the electrode tab, thereby reducing the risk of the electrode tab cracking or powdering, and reducing the risk of the separator 24 of the battery cell 20 being punctured to cause positive and negative electrode short circuit during the cycle process.

[0123] And the base material 231 is of a porous material, and the first surface 2311 of the base material 231 has the blank area 2313 not coated with the adhesive layer 234, so that active ions (such as lithium ions) can normally pass through the blank area 2313 of the adhesive tape 23 not provided with the adhesive layer 234 during the charging and discharging process of the battery cell, compared with the adhesive layer 234 being fully laid on the first surface 2311 of the base material 231, on the one hand, the area of the active ions passing through the adhesive tape 23 is increased, and the blocking effect of the adhesive tape 23 on the movement of the active ions is reduced, so that the capacity of the area of the battery cell 20 with the adhesive tape 23 can be normally exerted, and the battery cell 20 has a higher energy density.

[0124] On the other hand, since the active ions can normally pass through the adhesive tape 23, the active ions are not easy to accumulate at the edge of the adhesive tape 23, thereby reducing the risk of metal ions being deposited on the surface of the negative electrode tab.

[0125] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application 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 battery cell, comprising: An electrode assembly, comprising a first electrode piece; Adhesive tape is attached to the first electrode, the adhesive tape comprises a base material and an adhesive layer, the base material has a first surface in a thickness direction, and the adhesive layer is provided on the first surface; Wherein, the substrate is made of a porous material, and the first surface includes a glue-coated area coated with the glue layer and a blank area not coated with the glue layer.

2. The battery cell according to claim 1, wherein: The adhesive layer includes a plurality of sub-adhesive layers, which are spaced apart on the substrate along a first direction so that a blank area is formed between two adjacent sub-adhesive layers. The first direction is perpendicular to the thickness direction of the substrate.

3. The battery cell according to claim 2, wherein: The extending direction of each sub-glue layer intersects with the width direction of the substrate, and the extending direction of each sub-glue layer intersects with the length direction of the substrate.

4. The battery cell according to claim 2, wherein: The thickness of the sub-glue layer is not less than 0.5um and not more than 8um.

5. The battery cell according to any one of claims 1 to 4, wherein: The electrode assembly is a wound structure, and further includes a second electrode sheet and a diaphragm, wherein the first electrode sheet and the second electrode sheet have opposite polarities, and the diaphragm is disposed between the first electrode sheet and the second electrode sheet; Wherein, the adhesive tape is affixed to at least one bent section of the first pole piece. The battery cell according to claim 5 , wherein: The adhesive tape is attached to both sides of at least one bent section of the first pole piece in the thickness direction.

7. The battery cell according to claim 5, wherein: The adhesive tape is attached to the innermost bending section of the first pole piece.

8. The battery cell according to any one of claims 1 to 7, wherein: The first electrode is a positive electrode.

9. The battery cell according to claim 5, wherein: The adhesive tape includes a first adhesive tape and a second adhesive tape, wherein the first adhesive tape and the second adhesive tape are respectively arranged on both sides of the innermost bending section of the first pole piece in the thickness direction; Along the width direction of the first pole piece, the first adhesive tape has a first end and a second end extending beyond the first pole piece, and the second adhesive tape has a third end and a fourth end extending beyond the first pole piece, the first end is connected to the third end, and the second end is connected to the fourth end.

10. The battery cell according to any one of claims 1 to 9, wherein: Along the thickness direction of the first pole piece, the adhesive tape has a first region overlapping with the first pole piece, and the ratio of the area of ​​the adhesive layer located in the first region to the area of ​​the first region is not less than 10% and not more than 85%.

11. A battery comprising the battery cell according to any one of claims 1 to 10.

12. An electrical device comprising the battery cell according to any one of claims 1 to 10 or the battery according to claim 11, wherein the battery cell or the battery is used to provide electrical energy.

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