Battery cell, battery, and electric device

Abstract

The present application relates to the technical field of batteries, and provides a battery cell, a battery, and an electric device. The battery cell comprises an electrode assembly, and the electrode assembly comprises an electrode sheet and an adhesive tape. The electrode sheet is wound along a preset winding direction, and the electrode sheet comprises a first end close to a winding start point and a second end close to a winding end point. The adhesive tape is at least partially bonded to the surface of the first end and / or the second end of the electrode sheet, wherein the adhesive tape comprises through holes passing through the adhesive tape along the thickness direction. According to the battery cell provided by the embodiments of the present application, the adhesive tape is bonded to the surface of the first end of the electrode sheet close to the winding start point, so that the supporting effect of a central hole of the electrode assembly can be improved; the adhesive tape is bonded to the surface of the second end of the electrode sheet close to the winding end point, so that the termination and fixation effects of the electrode sheet can be achieved, thereby preventing the wound electrode assembly from loosening; and the adhesive tape comprises the through holes passing through the adhesive tape along the thickness direction, so that the infiltration effect of an electrolyte during injection into the battery cell can be improved, thereby improving the cycle performance of the battery cell.

Description

Battery cells, batteries and electrical devices

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202420051141.5 filed on January 9, 2024, entitled “Battery Cell, Battery and Electrical Device”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] During the charge and discharge process, the battery cells may swell, affecting the battery's safety performance. In addition, as the battery's charge and discharge cycles continue, the electrolyte is continuously consumed, affecting the battery's lifespan.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the background art. To this end, one object of the present application is to provide a battery cell, a battery and an electrical device to improve the cycle performance of the battery cell.

[0008] An embodiment of the first aspect of the present application provides a battery cell, the battery cell includes an electrode assembly, the electrode assembly includes a pole piece and a tape, the pole piece is wound along a preset winding direction, the pole piece includes a first end near the starting point of the winding and a second end near the end of the winding, and the tape is at least partially bonded to the surface of the first end and / or the second end of the pole piece, wherein the tape includes a through hole that penetrates the tape along the thickness direction.

[0009] In the technical solution of the embodiment of the present application, by adhering tape to the surface of the first end of the electrode sheet near the starting point of winding, the supporting effect of the center hole of the electrode assembly can be improved; by adhering tape to the surface of the second end of the electrode sheet near the end point of winding, the electrode sheet tail fixing effect can be achieved, which can prevent the electrode assembly from loosening after winding; the tape includes a through hole that penetrates the tape along the thickness direction, which can improve the wetting effect of the battery cell when the electrolyte is injected, thereby improving the cycle performance of the battery cell.

[0010] In some embodiments, along the length of the electrode sheet, the adhesive tape includes a first region and a second region connected to each other, the first region being adhered to the surface of the electrode sheet, and the second region being offset from the electrode sheet, wherein the through-hole is located in the second region. By arranging the through-hole in the second region offset from the electrode sheet, the area of ​​adhesion between the first region without the through-hole and the surface of the electrode sheet is larger, thereby making the adhesion between the adhesive tape and the electrode sheet more secure and reliable, effectively reducing the obstruction of the adhesive tape on the ion diffusion channel, and improving the wetting effect of the battery cell when injecting the electrolyte.

[0011] In some embodiments, the tape includes a first adhesive layer and a second adhesive layer, wherein a first region of the first adhesive layer and a first region of the second adhesive layer are respectively adhered to opposite surfaces of the electrode sheet, and a second region of the first adhesive layer and a second region of the second adhesive layer are aligned. Providing the first and second adhesive layers facilitates affixing the tape to both sides of one end of the electrode sheet. Furthermore, the alignment of the two adhesive layers prevents exposure of the adhesive layer, allowing the electrode sheet to be bonded to the roller, thereby facilitating smooth winding of the electrode assembly.

[0012] In some embodiments, the adhesive tape includes a substrate layer and an adhesive layer sequentially arranged along the thickness direction. The substrate layer is provided with a plurality of first through-holes, and the adhesive layer is provided with second through-holes corresponding one-to-one with the plurality of first through-holes. The first through-holes are connected to the second through-holes to form through-holes. The projection of the first through-holes on the surface of the adhesive layer completely falls within the range of the second through-holes. By setting the first through-holes on the surface of the substrate layer smaller than the second through-holes in the adhesive layer, the through-holes can be misaligned during the application of the adhesive tape, thereby simplifying the application process of the adhesive tape.

[0013] In some embodiments, along the width direction of the electrode, the electrode includes a tab region and a body region, and at least a portion of the surface of the body region is adhered to the tape. Along the width direction of the electrode, the electrode includes a tab region and a body region, and at least a portion of the surface of the body region is adhered to the tape. Adhesion of a portion of the surface of the electrode to the tape can reduce the probability of tape misalignment, wrinkles, or bubbles in the tape, thereby simplifying the tape application process.

[0014] In some embodiments, at least a portion of the surface of the tab region is adhered to the tape. By adhering at least a portion of the surface of the tab region to the tape, the probability of the tab region folding can be reduced.

[0015] In some embodiments, the through-holes are shaped in one or more of an ellipse, a circle, and a polygon. The through-holes are shaped in one or more of an ellipse, a circle, and a polygon. The through-holes are compatible with a variety of different shapes, allowing for the use of a variety of punching dies during the through-hole processing process, thereby reducing the difficulty of producing the tape.

[0016] In some embodiments, a ratio S of the spacing between the centers of two adjacent through-holes to the maximum distance from the center of the through-hole to the edge of the through-hole satisfies 2<S≤3. By ensuring that the ratio S of the spacing between the centers of two adjacent through-holes to the maximum distance from the center of the through-hole to the edge of the through-hole satisfies 2≤S≤3, the support effect on the electrode assembly can be improved while also improving the infiltration effect of the electrolyte.

[0017] In some embodiments, the through-holes are circular, with a diameter L1 of the through-holes satisfying 0.1 mm ≤ L1 ≤ 10 mm, and a spacing L2 between the centers of two adjacent through-holes satisfying 0.2 mm ≤ L2 ≤ 30 mm. By ensuring that the diameter L1 of the through-holes satisfies 0.1 mm ≤ L1 ≤ 10 mm, and the spacing L2 between the centers of two adjacent through-holes satisfies 0.2 mm ≤ L2 ≤ 30 mm, the adhesive tape can be reliably bonded to the electrode, while also reducing the tape's obstruction of the lithium ion diffusion path and its impact on the electrolyte's wetting effect.

[0018] In some embodiments, the diameter L1 of the through-hole satisfies 0.5 mm ≤ L1 ≤ 5 mm, and the spacing L2 between the centers of two adjacent through-holes satisfies 1 mm ≤ L2 ≤ 15 mm. By ensuring that the diameter L1 of the through-hole satisfies 0.5 mm ≤ L1 ≤ 5 mm and the spacing L2 between the centers of two adjacent through-holes satisfies 1 mm ≤ L2 ≤ 15 mm, the adhesion between the tape and the electrode sheet can be made more secure and reliable, and the tape's obstruction of the lithium ion diffusion channel can be effectively reduced, further reducing the tape's impact on the electrolyte's wetting effect.

[0019] An embodiment of the second aspect of the present application provides a battery, which includes the battery cell in the above embodiment.

[0020] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without paying creative work.

[0023] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0024] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0025] FIG3 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0026] FIG4 is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application;

[0027] FIG5 is a schematic diagram of the structure of the pole piece after unfolding according to some embodiments of the present application;

[0028] FIG6 is a first schematic diagram of electrode gluing provided in some embodiments of the present application;

[0029] FIG7 is a second schematic diagram of electrode gluing provided in some embodiments of the present application;

[0030] FIG8 is a third schematic diagram of electrode gluing provided in some embodiments of the present application;

[0031] FIG9 is a fourth schematic diagram of electrode gluing provided in some embodiments of the present application;

[0032] FIG10 is a partial enlarged view of the adhesive tape provided in some embodiments of the present application;

[0033] FIG11 is a cross-sectional view of FIG10 .

[0034] Explanation of the accompanying drawings: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, casing; 11, first part; 12, second part; 20, battery cell; 21, end cover; 22, shell; 23, electrode assembly; 201, pole piece; 210, positive pole piece; 211, first end of positive pole piece; 212, second end of positive pole piece; 220, negative pole piece; 221, first end of negative pole piece; 222, second end of negative pole piece; 230, tab area; 240, pole piece body area; 310, diaphragm; 400, tape; 410, first area; 420, second area; 430, through hole; 401, first adhesive layer; 402, second adhesive layer; 440, first through hole; 450, second through hole; 403, substrate layer; 404, adhesive layer. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0044] A battery cell consists of an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0045] In a wound electrode assembly, a central hole forms at the center of the positive electrode sheet, separator, and negative electrode sheet after they are wound together. During the charge and discharge process, as the electrode sheets expand and contract, the center of the electrode assembly is prone to collapse. This collapse can lead to wrinkles in the sheet, creating unevenness in the sheet and creating gully-like gaps between the sheets, hindering ion transport.

[0046] In one embodiment, the electrode sheet can be reinforced by applying tape to the starting position of the electrode sheet, forming a self-supporting structure at the center hole, enhancing the electrode sheet's resistance to deformation and reducing the risk of deformation and collapse at the center of the electrode assembly. However, applying tape to the starting position of the electrode sheet results in a longer electrolyte soaking time during injection, poor electrolyte fluidity in the adhesive-applied area, and poor battery cell cycling performance.

[0047] Based on the above considerations, in order to solve the problem of poor battery cycle performance, this application proposes a battery cell, which improves the support function of the central hole of the electrode assembly by adhering tape to the surface of the first end of the electrode sheet near the winding starting point; affixing tape to the surface of the second end of the electrode sheet near the winding end point to achieve the electrode sheet tail fixation effect, ensuring that the electrode assembly will not loosen after winding; the tape includes a through hole penetrating the tape along the thickness direction, which improves the infiltration effect of the battery cell when injecting electrolyte, thereby improving the cycle performance of the battery cell.

[0048] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to improve the fluidity of the electrolyte in the battery cells and enhance the cycle performance of the battery cells.

[0049] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0050] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0051] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0052] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0053] Please refer to Figure 2, which is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application. Battery 100 includes a housing 10 and battery cells 20, with battery cells 20 housed within housing 10. Housing 10 is used to provide storage space for battery cells 20 and can have various structures. In some embodiments, housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for battery cells 20. Second portion 12 can be a hollow structure with one end open. First portion 11 can be a plate-like structure, with first portion 11 overlapping the open side of second portion 12, so that the first and second portions 11 and 12 together define a storage space. Alternatively, first portion 11 and second portion 12 can each be a hollow structure with one end open, with the open side of first portion 11 overlapping the open side of second portion 12. Of course, housing 10 formed by first portion 11 and second portion 12 can have various shapes, such as a cylinder or a rectangular parallelepiped.

[0054] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0055] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0056] Please refer to Figure 3, which is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. As shown in Figure 3, a battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0057] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. In some embodiments, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap 21. The electrode terminal can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0058] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0059] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0060] According to some embodiments of the present application, referring to Figures 4 to 9, Figure 4 is a structural schematic diagram of an electrode assembly provided in some embodiments of the present application, Figure 5 is a structural schematic diagram of the electrode after unfolding provided in some embodiments of the present application, Figure 6 is a first schematic diagram of electrode gluing provided in some embodiments of the present application, Figure 7 is a second schematic diagram of electrode gluing provided in some embodiments of the present application, Figure 8 is a third schematic diagram of electrode gluing provided in some embodiments of the present application, Figure 9 is a fourth schematic diagram of electrode gluing provided in some embodiments of the present application, Figure 10 is a partial enlarged view of the tape provided in some embodiments of the present application, and Figure 11 is a cross-sectional view of Figure 10.

[0061] The present application provides a battery cell 20, which includes an electrode assembly 23, and the electrode assembly 23 includes a pole piece 201 and a tape 400. The pole piece 201 is wound along a preset winding direction R, and the pole piece 201 includes a first end near the starting point of the winding and a second end near the end of the winding, and the tape 400 is at least partially bonded to the surface of the first end and / or the second end of the pole piece 201, wherein the tape 400 includes a through hole 430 that penetrates the tape 400 along the thickness direction.

[0062] The electrode assembly 23 of the embodiment of the present application can be applied to various types of battery cells 20. The battery cells 20 can include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery cells 20 can be cylindrical, flat, rectangular, or other shapes, etc., which are not limited in the embodiments of the present application. The battery cells 20 are generally divided into cylindrical battery cells, square battery cells, and soft-pack battery cells according to the packaging method, which are not limited in the embodiments of the present application.

[0063] In the embodiment of the present application, the electrode sheet 201 can be a positive electrode sheet 210 or a negative electrode sheet 220. The electrode assembly 23 can also include a separator 310, which is disposed between the positive electrode sheet 210 and the negative electrode sheet 220. The operation of the electrode assembly 23 is achieved by the movement of metal ions in the electrolyte between the positive electrode sheet 210 and the negative electrode sheet 220.

[0064] For example, the winding structure of the electrode assembly 23 can be a cylindrical winding structure, and the predetermined winding direction can be a winding direction from the inside to the outside, with one end of the electrode sheet 201 as the winding starting point and winding from the inside to the outside. The first end near the winding starting point is located inside the electrode assembly 23, and the second end near the winding end point is located outside the electrode assembly 23.

[0065] 4 , the negative electrode sheet 220 has a first negative electrode sheet end 221 near the winding start point and a second negative electrode sheet end 222 near the winding end point in the winding direction R. The positive electrode sheet 210 has a first positive electrode sheet end 211 near the winding start point and a second positive electrode sheet end 212 near the winding end point in the winding direction R. In the electrode assembly, a separator 310, the negative electrode sheet 220, another separator 310, and the positive electrode sheet 210 are stacked in sequence and then wound in a predetermined winding direction R. Both separators 310 can be longer than the negative electrode sheet 220 and the positive electrode sheet 210 in the predetermined winding direction R. Accordingly, the innermost side of the electrode assembly 23 can be first wound from the two separators 310, and the ends of the two separators 310 can be wound around the outermost side of the electrode assembly 23.

[0066] In one example, at least one of the negative electrode first end 221 of the negative electrode sheet 220 and the positive electrode first end 211 of the positive electrode sheet 210 has a tape 400 attached to at least a portion of its surface. In some embodiments, the tape 400 is attached to the surface of one end of the electrode sheet 201 along the width direction Y of the electrode sheet 201. By attaching the tape 400 to the electrode sheet 201 near the winding starting point, the electrode sheet 201 at the center hole can form a self-supporting structure, thereby enhancing the deformation resistance of the electrode sheet 201 and reducing the risk of deformation and collapse at the center of the electrode assembly 23.

[0067] In another example, at least one of the negative electrode sheet second end 222 of the negative electrode sheet 220 and the positive electrode sheet second end 212 of the positive electrode sheet 210 is at least partially adhered with tape 400. By using tape 400 to bond and secure the second end of the electrode sheet 201 near the winding end point, the electrode sheet 201 can be secured at the end, ensuring that the electrode assembly 23 does not become loose after winding.

[0068] In another example, referring to FIG5 , adhesive tape 400 is affixed to at least a portion of the surface of the negative electrode sheet first end 221 and the negative electrode sheet second end 222 of the negative electrode sheet 220, and the positive electrode sheet first end 211 and the positive electrode sheet second end 212 of the positive electrode sheet 210. By affixing the adhesive tape 400 to the electrode sheet 201 near the starting point of winding, a self-supporting structure can be formed at the electrode sheet 201 at the center hole position, thereby enhancing the deformation resistance of the electrode sheet 201 and reducing the risk of deformation and collapse at the center position of the electrode assembly 23. At the same time, the adhesive tape 400 is used to achieve bonding and fixation at the second end of the electrode sheet 201 near the winding end point, thereby achieving a final fixing effect on the electrode sheet 201 and ensuring that the electrode assembly 23 will not become loose after winding.

[0069] In an embodiment of the present application, the tape 400 may include a substrate layer 403 and an adhesive layer 404. The adhesive layer 404 is disposed on one side of the substrate layer 403 and may serve as an adhesive surface, while the other side of the substrate layer 403 serves as a non-adhesive surface. The tape 400 includes through-holes 430 extending through the tape 400 in the thickness direction. During the battery charge and discharge process, metal ions within the electrode assembly 23 may move between the positive electrode sheet 210 and the negative electrode sheet 220 through the through-holes 430 included in the tape 400. Referring to FIG. 5 , the through-holes 430 may be located throughout the entire area of ​​the tape 400. Referring to FIG. 6 to FIG. 9 , the through-holes 430 may also be located only in a portion of the tape 400. There may be multiple through-holes 430, and the shape of the through-holes 430 may be one or more of an elliptical, circular, and polygonal shape.

[0070] In an embodiment of the present application, by adhering tape 400 to the surface of the first end of the pole piece 201 near the starting point of winding, the supporting effect of the center hole of the electrode assembly 23 is improved; by adhering tape 400 to the surface of the second end of the pole piece 201 near the end point of winding, the pole piece 201 is fixed at the end, which can prevent the electrode assembly 23 from loosening after winding; the tape 400 includes a through hole 430 that penetrates the tape 400 along the thickness direction, which can improve the wetting effect of the battery cell 20 when the electrolyte is injected, thereby improving the cycle performance of the battery cell 20.

[0071] According to some embodiments of the present application, along the length direction X of the pole piece 201, the tape 400 may include a first area 410 and a second area 420 connected to each other, the first area 410 is adhered to the surface of the pole piece 201, and the second area 420 is staggered with the pole piece 201, wherein the through hole 430 is located in the second area 420.

[0072] 5 , the electrode 201 may be any one of the negative electrode first end 221 and the negative electrode second end 222 of the negative electrode 220, and the positive electrode first end 211 and the positive electrode second end 212 of the positive electrode 210. Tape 400 is attached to at least a portion of the surface of the electrode 201.

[0073] At the first end 221 of the negative electrode sheet, the second end 222 of the negative electrode sheet, the first end 211 of the positive electrode sheet and the second end 212 of the positive electrode sheet, along the length direction X of the electrode sheet 201, the tape 400 may include a connected first area 410 and a second area 420, and the through hole 430 included in the tape 400 and penetrating the tape 400 along the thickness direction is located in the second area 420, that is, the first area 410 of the tape 400 does not include the through hole 430, and the first area 410 of the tape 400 is adhered to the surface of the electrode sheet 201, increasing the bonding area between the tape 400 and the electrode sheet 201, so as to reduce the probability of the tape 400 falling off during the process of winding the electrode sheet 201 to form an electrode assembly, and also prevent the formation of a lithium-rich area in the punched area of ​​the tape 400 and the risk of lithium plating.

[0074] In the embodiment of the present application, along the length direction X of the pole piece 201, the tape 400 includes a first area 410 and a second area 420 that are connected. By arranging the through hole 430 in the second area 420 that is staggered with the pole piece 201, the area of ​​the bonding area between the first area 410 without the through hole 430 and the surface of the pole piece 201 is larger, so that the bonding between the tape 400 and the pole piece 201 can be more fixed and reliable, and at the same time, the obstruction of the tape 400 to the ion diffusion channel can be effectively reduced, and the wetting effect of the battery cell 20 when the electrolyte is injected can be improved.

[0075] According to some embodiments of the present application, referring to Figure 5, the tape 400 includes a first adhesive layer 401 and a second adhesive layer 402, the first area 410 of the first adhesive layer 401 and the first area 410 of the second adhesive layer 402 are respectively adhered to two opposite surfaces of the electrode 201, and the second area 420 of the first adhesive layer 401 and the second area 420 of the second adhesive layer 402 are adhered to each other.

[0076] Illustratively, at least portions of the surfaces of the negative electrode first end 221 and the negative electrode second end 222 of the negative electrode sheet 220 , and the positive electrode first end 211 and the positive electrode second end 212 of the positive electrode sheet 210 are adhered with tape 400 .

[0077] At the first end 221 of the negative electrode sheet, the second end 222 of the negative electrode sheet, the first end 211 of the positive electrode sheet, and the second end 212 of the positive electrode sheet, the tape 400 includes a first adhesive layer 401 and a second adhesive layer 402. The first area 410 of the first adhesive layer 401 and the first area 410 of the second adhesive layer 402 are respectively adhered to the two opposite surfaces of the electrode sheet, and the second area 420 of the first adhesive layer 401 and the second area 420 of the second adhesive layer 402 are adhered to each other.

[0078] Through holes 430 may be provided in the second area 420 of the first adhesive layer 401 and the second area 420 of the second adhesive layer 402. When the second area 420 of the first adhesive layer 401 and the second area 420 of the second adhesive layer 402 are affixed to each other, the through holes 430 are aligned so that when the tape 400 includes the first adhesive layer 401 and the second adhesive layer 402, the tape 400 includes the through holes 430 that penetrate the tape 400 along the thickness direction.

[0079] In the embodiment of the present application, by setting the first adhesive layer 401 and the second adhesive layer 402, it is convenient to stick the tape 400 to the two side surfaces of one end of the electrode 201, and the two adhesive layers can prevent the adhesive layer from being exposed, and the electrode is bonded to the roller, which is conducive to the smooth winding of the electrode assembly 23.

[0080] According to some embodiments of the present application, referring to Figures 10 and 11, the adhesive tape 400 includes a base material layer 403 and an adhesive layer 404 arranged in sequence along the thickness direction Z, the base material layer 403 is provided with a plurality of first through holes 440, and the adhesive layer 404 is provided with second through holes 450 corresponding one-to-one to the plurality of first through holes 440, and the first through holes 440 are connected to the second through holes 450 to form a through hole 430; wherein, the projection of the first through hole 440 on the surface of the adhesive layer 404 completely falls within the range of the second through hole 450.

[0081] In this embodiment of the present application, adhesive tape 400 may include a substrate layer 403 and an adhesive layer 404. Adhesive layer 404 is disposed on one surface of the substrate layer and serves as an adhesive surface, while the other surface of substrate layer 403 serves as a non-adhesive surface. The substrate layer 403 may be made of, for example, polypropylene (PP), polyethylene terephthalate (PET), or polyimide (PI). Adhesive layer 404 may be made of, for example, acrylic adhesive (e.g., PMMA adhesive).

[0082] In the embodiment of the present application, referring to FIG. 11 , a first through hole 440 provided on the substrate layer 403 penetrates the substrate layer along the thickness direction Z of the adhesive tape 400, and a second through hole 450 provided on the adhesive layer 404 penetrates the adhesive layer 404 along the thickness direction Z of the adhesive tape 400. The shapes of the first through hole 440 and the second through hole 450 may be the same or different. The second through hole 450 corresponds one-to-one with the first through hole 440, and the projection of the first through hole 440 on the surface of the adhesive layer 404 completely falls within the range of the second through hole 450. This means that the substrate layer 403 can completely cover the surface of the adhesive layer and has a portion extending beyond the adhesive layer. In this way, when the first adhesive layer 401 and the second adhesive layer 402 are attached to each other, even if there is a certain degree of misalignment, the portion of the substrate layer 403 extending beyond the adhesive layer 404 can still cover the adhesive layer 404 exposed due to the misalignment, thereby preventing the adhesive layer 404 from adhering to other surfaces, such as the electrode or conveying roller during winding or conveying.

[0083] In the embodiment of the present application, the first through hole 440 of the substrate layer 403 on the surface is set to be smaller than the second through hole 450 of the adhesive layer 404, which allows the through holes 430 of the tape 400 to be misaligned during the pasting process, thereby simplifying the pasting process of the tape 400.

[0084] According to some embodiments of the present application, along the width direction Y of the pole piece 201 , the pole piece 201 includes a pole ear region 230 and a pole piece body region 240 , and at least a portion of the surface of the pole piece body region 240 is adhered to the tape 400 .

[0085] In some embodiments, the electrode body region 240 of the electrode 201 is the region on the current collector coated with an active material, and the tab region 230 of the electrode 201 is the region on the current collector not coated with an active material. The tab region 230 and the electrode body region 240 are adjacently arranged along the width direction Y of the electrode 201. The electrode 201 can be a positive electrode electrode 210 or a negative electrode electrode 220. The positive electrode electrode 210 includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer to serve as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet 220 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon, silicon, or the like.

[0086] In some embodiments, along the width direction Y of the pole piece 201 , the width of the tape 400 may be the same as the width of the pole piece body region 240 , or the width of the tape 400 may be smaller than the width of the pole piece body region 240 .

[0087] Exemplarily, referring to FIG. 8 , along the width direction Y of the pole piece 201 , the width of the tape 400 is smaller than the width of the pole piece body region 240 , and a portion of the surface of the pole piece body region 240 is adhered to the tape 400 .

[0088] In the embodiment of the present application, along the width direction Y of the pole piece 201, the pole piece 201 includes a pole ear area 230 and a pole piece body area 240, and at least part of the surface of the pole piece body area 240 is adhered to the tape 400. Part of the surface of the pole piece 201 is adhered to the tape 400, which can reduce the probability of the tape 400 being misaligned, the tape 400 having wrinkles or bubbles, thereby simplifying the pasting process of the tape 400.

[0089] According to some embodiments of the present application, at least a portion of the surface of the tab region 230 is adhered to the tape 400 .

[0090] In the embodiment of the present application, along the width direction Y of the electrode piece 201 , the entire surface of the tab region 230 may be adhered to the tape 400 , or only a portion of the surface of the tab region 230 may be adhered to the tape 400 .

[0091] For example, referring to FIG. 6 , along the width direction Y of the pole piece 201 , a portion of the surface of the pole piece body region 240 and a portion of the surface of the pole tab region 230 are adhered to the tape 400 .

[0092] In the embodiment of the present application, by adhering at least a portion of the surface of the tab region 230 to the tape 400 , the probability of the tab region 230 folding can be reduced.

[0093] In some embodiments, along the width direction Y of the pole piece 201 , the size of the tape 400 may be greater than or equal to the size of the pole piece 201 .

[0094] In the embodiment of the present application, along the width direction Y of the pole piece 201 , the size of the tape 400 is greater than or equal to the size of the pole piece 201 , which means that the surface of the pole tab area 230 and the surface of the pole piece body area 240 are both adhered to the tape 400 .

[0095] For example, referring to FIG. 7 and FIG. 9 , along the width direction Y of the pole piece 201 , the entire surface of the tab region 230 and the entire surface of the pole piece body region 240 are adhered to the tape 400 .

[0096] In the embodiment of the present application, along the width direction Y of the electrode 201, the size of the tape 400 is greater than or equal to the size of the electrode 201, which can further reduce the probability of the electrode tab folding and further reduce the process requirements for the adhesive tape 400.

[0097] According to some embodiments of the present application, the shape of the through hole 430 may include one or more of an ellipse, a circle, and a polygon.

[0098] For example, referring to Fig. 8 , the through hole 430 is triangular in shape. Referring to Fig. 6 , Fig. 7 and Fig. 9 , the through hole 430 is circular in shape.

[0099] In one example, the shape of the through hole 430 may include an ellipse, a circle, and a polygon.

[0100] In the embodiment of the present application, the shape of the through hole 430 includes one or more of an ellipse, a circle and a polygon. The through hole 430 can be compatible with a variety of different shapes, so that it can be applied to a variety of punching molds during the processing of the through hole 430, thereby reducing the production difficulty of the tape 400.

[0101] According to some embodiments of the present application, a ratio S of a distance L between the centers of two adjacent through holes 430 to a maximum distance from the center of the through hole 430 to the edge of the through hole 430 satisfies 2<S≤3.

[0102] In the embodiment of the present application, referring to FIG7 , the distance between the centers of two adjacent through-holes is L. If the ratio S of the distance L between the centers of two adjacent through-holes 430 to the maximum distance from the center of a through-hole 430 to the edge of the through-hole 430 is too small, that is, the distance between the two adjacent through-holes 430 is too close, the overall structural strength of the tape 400 will be weakened, and the tape will be easily broken during the winding process of the electrode sheet 201, which is not conducive to supporting the structure of the electrode assembly.

[0103] In the embodiment of the present application, the ratio S of the spacing between the centers of two adjacent through holes 430 to the maximum distance from the center of the through hole 430 to the edge of the through hole 430 is too large, that is, the distance between the two adjacent through holes 430 is too far, then the number of through holes 430 will be too small, which is not conducive to improving the infiltration effect of the electrolyte.

[0104] Optionally, S can be 2, 2.2, 2.4, 2.6, 2.8 or 3, etc.

[0105] In the embodiment of the present application, by making the ratio S of the spacing between the centers of two adjacent through holes 430 and the maximum distance from the center of the through hole 430 to the edge of the through hole 430 satisfy 2<S≤3, the support effect of the electrode assembly 23 can be improved while the infiltration effect of the electrolyte can also be improved.

[0106] According to some embodiments of the present application, referring to FIG. 10 , the through hole 430 is a circular hole, the diameter L1 of the through hole 430 satisfies 0.1 mm ≤ L1 ≤ 10 mm, and the distance L2 between the centers of two adjacent through holes 430 satisfies 0.2 mm ≤ L2 ≤ 30 mm.

[0107] In the embodiment of the present application, the smaller the diameter L1 of the through-hole 430, the easier it is to clog. However, the larger the diameter L1 of the through-hole 430, the weaker the support strength of the tape 400 and the lower the bonding strength between the tape 400 and the surface of the electrode 201. Similarly, the larger the spacing L2 between the centers of two adjacent through-holes 430, the fewer the number of through-holes 430 and the lower the wetting effect on the battery cell. The larger the spacing L2 between the centers of two adjacent through-holes 430, the greater the number of through-holes 430, the weaker the support strength of the tape 400 and the lower the bonding strength between the tape 400 and the surface of the electrode 201.

[0108] Optionally, the diameter L1 of the through hole 430 may be 0.1 mm, 1 mm, 3 mm, 5 mm or 10 mm, and the distance L2 between the centers of two adjacent through holes 430 may be 0.2 mm, 5 mm, 10 mm, 20 mm or 30 mm, etc.

[0109] In the embodiment of the present application, by ensuring that the diameter L1 of the through hole 430 satisfies 0.1mm≤L1≤10mm and the spacing L2 between the centers of two adjacent through holes 430 satisfies 0.2mm≤L2≤30mm, the bonding and fixation between the tape 400 and the electrode 201 can be reliable, while reducing the obstruction of the lithium ion diffusion channel by the tape 400 and reducing the influence of the tape 400 on the wetting effect of the electrolyte.

[0110] According to some embodiments of the present application, the diameter L1 of the through hole 430 satisfies 0.5 mm ≤ L1 ≤ 5 mm, and the distance L2 between the centers of two adjacent through holes 430 satisfies 1 mm ≤ L2 ≤ 15 mm.

[0111] Optionally, the diameter L1 of the through hole 430 may be 0.5 mm, 1 mm, 3 mm, 4 mm or 5 mm, and the distance L2 between the centers of two adjacent through holes 430 may be 1 mm, 5 mm, 10 mm, 10 mm or 15 mm, etc.

[0112] In the embodiment of the present application, by ensuring that the diameter L1 of the through hole 430 satisfies 0.5mm≤L1≤5mm and the spacing L2 between the centers of two adjacent through holes 430 satisfies 1mm≤L2≤15mm, the bonding between the tape 400 and the electrode 201 can be made more fixed and reliable, and the obstruction of the lithium ion diffusion channel by the tape 400 can be effectively reduced, further reducing the influence of the tape 400 on the wetting effect of the electrolyte.

[0113] An embodiment of the present application provides a battery 100 , which includes the battery cell 20 in the above embodiment.

[0114] By adopting the battery cell 20 in the embodiment of the present application, the wetting effect of the battery cell when injecting the electrolyte can be improved, thereby improving the cycle performance of the battery cell 20.

[0115] An embodiment of the present application provides an electrical device, which includes the battery 100 in the above embodiment, and the battery 100 is used to provide electrical energy.

[0116] The technical solution of the present application is further described below through a specific embodiment, as shown in Figures 1 to 11.

[0117] The battery cell 20 includes an electrode assembly 23, which includes a pole piece 201 and a tape 400. The pole piece 201 is wound along a predetermined winding direction R. The pole piece 201 includes a first end near the winding start point and a second end near the winding end point. The tape 400 is at least partially bonded to the surface of the first end and / or the second end of the pole piece 201. The tape 400 includes a through hole 430 extending through the tape 400 along the thickness direction. The shape of the through hole 430 includes one or more of an elliptical, circular, and polygonal shape. The ratio S of the spacing L between the centers of two adjacent through holes 430 to the maximum distance from the center of the through hole 430 to the edge of the through hole 430 satisfies 2≤S≤3.

[0118] The tape 400 includes a first adhesive layer 401 and a second adhesive layer 402. The first area 410 of the first adhesive layer 401 and the first area 410 of the second adhesive layer 402 are respectively adhered to the two opposite surfaces of the electrode 201, and the second area 420 of the first adhesive layer 401 and the second area 420 of the second adhesive layer 402 are adhered to each other.

[0119] The adhesive tape 400 includes a base material layer 403 and an adhesive layer 404 arranged in sequence along the thickness direction. The base material layer 403 is provided with a plurality of first through holes 440, and the adhesive layer 404 is provided with second through holes 450 corresponding one-to-one to the plurality of first through holes 440. The first through holes 440 are connected to the second through holes 450 to form a through hole 430; wherein the projection of the first through holes 440 on the surface of the adhesive layer 404 completely falls within the range of the second through holes 450.

[0120] Along the length direction X of the pole piece 201, the tape 400 may include a first region 410 and a second region 420 that are connected. The first region 410 is adhered to the surface of the pole piece 201, and the second region 420 is staggered from the pole piece 201. The through hole 430 is located in the second region 420. Along the width direction Y of the pole piece 201, the pole piece 201 includes a tab region 230 and a pole piece body region 240. In some embodiments, at least a portion of the surface of the pole piece body region 240 is adhered to the tape 400. In other embodiments, at least a portion of the surface of the tab region 230 is adhered to the tape 400. In yet other embodiments, along the width direction Y of the pole piece 201, the size of the tape 400 is greater than or equal to the size of the pole piece 201.

[0121] In some embodiments, the through hole 430 is a circular hole, the diameter L1 of the through hole 430 satisfies 0.5 mm≤L1≤5 mm, and the distance L2 between the centers of two adjacent through holes 430 satisfies 1 mm≤L2≤15 mm.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, comprising an electrode assembly, and the electrode assembly includes: a pole piece, which is wound along a preset winding direction, the pole piece includes a first end close to the winding starting point and a second end close to the winding ending point, and a tape, at least partially adhered to the surfaces of the first end and / or the second end of the pole piece, wherein the tape includes a through hole penetrating through the tape in the thickness direction.

2. The battery cell according to claim 1, wherein Along the length direction of the pole piece, the tape includes a connected first region and a second region, the first region is pasted on the surface of the pole piece, and the second region is offset from the pole piece, wherein the through hole is located in the second region.

3. The battery cell according to claim 2, wherein, The tape includes a first adhesive layer and a second adhesive layer, the first regions of the first adhesive layer and the second adhesive layer are respectively pasted on two opposite surfaces of the pole piece, and the second regions of the first adhesive layer and the second adhesive layer are pasted opposite to each other.

4. The battery cell according to any one of claims 1 to 3, wherein, The tape includes a base material layer and an adhesive layer arranged in sequence along the thickness direction, the base material layer is provided with a plurality of first through holes, and the adhesive layer is provided with second through holes corresponding to the plurality of first through holes one by one, and the first through holes are communicated with the second through holes to form the through hole; wherein, the projection of the first through hole on the surface of the adhesive layer completely falls within the range of the second through hole.

5. The battery cell according to any one of claims 1 to 4, wherein, Along the width direction of the pole piece, the pole piece includes a tab area and a pole piece body area, and at least part of the surface of the pole piece body area is adhered to the tape.

6. The battery cell according to claim 5, wherein, At least part of the surface of the tab area is adhered to the tape.

7. The battery cell according to any one of claims 1 to 6, wherein, The shape of the through hole includes one or more of an oval shape, a circular shape, and a polygonal shape.

8. The battery cell according to any one of claims 1 to 7, wherein, The ratio S between the distance between the centers of two adjacent through holes and the maximum distance from the center of the through hole to the edge of the through hole satisfies 2 < S ≤ 3.

9. The battery cell according to any one of claims 1 to 8, wherein, The through hole is a circular hole, the diameter L1 of the through hole satisfies 0.1 mm ≤ L1 ≤ 10 mm, and the distance L2 between the centers of two adjacent through holes satisfies 0.2 mm ≤ L2 ≤ 30 mm.

10. The battery cell according to claim 9, wherein, The diameter L1 of the through hole satisfies 0.5 mm ≤ L1 ≤ 5 mm, and the distance L2 between the centers of two adjacent through holes satisfies 1 mm ≤ L2 ≤ 15 mm.

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

12. An electrical device, the electrical device includes the battery according to claim 11, and the battery is used to provide electrical energy.

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