Electrode assembly and adhesive tape application method therefor, battery cell, battery, and electric device

Abstract

The present application is applicable to the technical field of power batteries, and provides an electrode assembly (400) and an adhesive tape application method therefor, a battery cell (300), a battery (200), and an electric device (100). The electrode assembly comprises: a first covering member (60) provided on the surface of the electrode assembly, the first covering member being provided with an information pattern; and a second covering member (70) provided on the surface of the electrode assembly, the information pattern being exposed outside the second covering member. According to the present application, the second covering member covers the surface of the electrode assembly, so that the electrode assembly is protected by the second covering member, thus reducing the impact of the external environment on the electrode assembly; and when the second covering member covers the electrode assembly, the information pattern can be exposed outside the second covering member, thus reducing the impact of the second covering member on the first covering member, so that an identification device can identify information recorded on the first covering member.

Description

Electrode assembly and gluing method thereof, battery cell, battery and electrical device

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on November 1, 2023, with application number 202311443462.6, and invention name “Electrode assembly and its gluing method, battery cell, battery and electrical device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of power batteries, and in particular to an electrode assembly and a gluing method thereof, a battery cell, a battery, and an electrical device. Background Art

[0003] 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.

[0004] During the production process of battery cells, it is usually necessary to stick protective tape and QR code tape on the battery cells. The protective tape is used to reduce damage to the battery cell's electrodes or diaphragms during production and transportation, and the QR code tape records product information. During the production process of battery cells, it is easy for the QR code tape to be difficult to identify.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides an electrode assembly and its gluing method, a battery cell, a battery and an electrical device, which solves the problem that the QR code tape is difficult to be identified during the production of battery cells.

[0007] In a first aspect, some embodiments of the present application provide an electrode assembly, comprising:

[0008] electrode assembly;

[0009] a first covering member disposed on a surface of the electrode assembly, wherein an information pattern is disposed on the first covering member;

[0010] The second covering member is arranged on the surface of the electrode assembly, and the information pattern is exposed outside the second covering member.

[0011] In the technical solution of this embodiment, the second cover covers the surface of the electrode assembly to protect the electrode assembly through the second cover and reduce the impact of the external environment on the electrode assembly; when the second cover covers the electrode assembly, the information pattern can be exposed outside the second cover, thereby reducing the impact of the second cover on the first cover, so as to facilitate the identification device to identify the information recorded on the first cover.

[0012] In some embodiments, the second cover is spaced apart from the first cover.

[0013] In the technical solution of this embodiment, the second cover is spaced apart from the first cover to reduce the impact of the second cover on the first cover, so that the first cover can be better exposed to the outside world, making it easier for the identification device to recognize the information recorded on the first cover.

[0014] In some embodiments, the second covering member is provided with an avoidance hole, and the first covering member is accommodated in the avoidance hole.

[0015] In the technical solution of this embodiment, a avoidance hole is provided on the second covering member, so that when the second covering member is provided on the first surface, the first covering member can be located in the avoidance hole, so that the second covering member can cover a larger area of ​​the first surface, reducing the area of ​​the first surface exposed to the outside world, thereby improving the protection effect of the second covering member on the electrode assembly.

[0016] In some embodiments, the avoidance hole includes at least two avoidance side walls, and two adjacent avoidance side walls are connected by rounded corners.

[0017] In the technical solution of this embodiment, the two adjacent avoidance side walls of the avoidance hole are connected by rounded corners. Compared with the two avoidance side walls being directly connected and forming a sharp corner, the setting of the rounded corners can reduce the stress concentration at the connection point of the two avoidance side walls; because the second covering part usually needs to be tensioned to reduce wrinkles after being arranged on the first surface, the setting of the rounded corners can reduce stress concentration, thereby reducing the occurrence of the second covering part being torn during the tensioning process.

[0018] In some embodiments, a distance between a sidewall of the first cover and an adjacent sidewall of the avoidance member is greater than zero.

[0019] In the technical solution of this embodiment, the distance between the side wall of the first cover and the avoidance side wall is made greater than zero, so that the first cover can be accommodated in the avoidance hole, reducing the difficulty of accommodating the first cover in the avoidance hole when the second cover is arranged on the first surface, and at the same time can reduce the situation where the information pattern is blocked by the second cover, providing an error space for the process of setting the second cover on the first surface in the processing process.

[0020] In some embodiments, a distance between a side wall of the first cover and an adjacent side wall of the avoidance member is less than or equal to 1 mm.

[0021] The technical solution of this embodiment provides a spacing range between the side walls of the first cover and the avoidance side walls to reduce the difficulty of accommodating the first cover in the avoidance hole when the second cover is arranged on the first surface, reduce the occurrence of the first cover being blocked by the second cover, and at the same time reduce the exposed area of ​​the first surface in the space between the side walls of the first cover and the avoidance side walls, so that the second cover can better play the role of protecting the electrode assembly.

[0022] In some embodiments, the electrode assembly includes two first surfaces disposed opposite to each other, and the first cover and the second cover are disposed on the same first surface;

[0023] Or the surface includes a first surface surrounding the electrode assembly.

[0024] In the technical solution of this embodiment, the electrode assembly can be formed by a lamination process or a winding process, that is, the electrode assembly gluing method can be applied to various types of electrode assemblies, increasing the compatibility of the electrode assembly gluing method.

[0025] In some embodiments, a distance between any edge of the projection of the second covering element on the first surface and an adjacent edge of the first surface is greater than zero.

[0026] In the technical solution of this embodiment, the distance between the edge of the projection of the second cover on the first surface and the edge of the adjacent first surface is made greater than zero, that is, there is a gap between any side of the second cover and the edge of the adjacent first surface, so that any side of the second cover is not likely to extend beyond the first surface, thereby reducing the occurrence of debris adhering to the second cover.

[0027] In some embodiments, a distance between an edge of a projection of the second cover on the first surface and an edge of an adjacent first surface is less than or equal to 3 mm.

[0028] The technical solution of this embodiment provides a spacing range between the projected edge of the second cover on the first surface and the adjacent edge of the first surface, so that the second cover is not easily extended beyond the first surface. At the same time, it can also enable the second cover to cover more area of ​​the first surface to better protect the electrode assembly.

[0029] In a second aspect, some embodiments of the present application further provide a method for gluing an electrode assembly, comprising:

[0030] A first covering member is provided on the surface of the electrode assembly, wherein the first covering member is provided with an information pattern;

[0031] A second covering member is arranged on the surface, and the information pattern is exposed outside the second covering member.

[0032] In the technical solution of this embodiment, an information pattern is set on the first cover to facilitate the identification device to identify the information recorded in the information pattern, and the first cover is first set on the surface of the electrode assembly to meet the processing requirements; the second cover covers the surface of the electrode assembly to protect the electrode assembly through the second cover and reduce the impact of the external environment on the electrode assembly; when the second cover covers the electrode assembly, the information pattern can be exposed outside the second cover, so that the identification equipment of subsequent processes can recognize the information recorded on the first cover.

[0033] In some embodiments, in the step of disposing a second covering member on the surface, the second covering member is spaced apart from the first covering member.

[0034] In the technical solution of this embodiment, the second cover is spaced apart from the first cover to reduce the impact of the second cover on the first cover, so that the first cover can be better exposed to the outside world, making it easier for the identification device to recognize the information recorded on the first cover.

[0035] In some embodiments, before the step of providing the second covering member on the surface, the electrode assembly gluing method further comprises:

[0036] Providing a second cover member, and setting a position avoidance hole on the second cover member;

[0037] In the step of arranging the second covering member on the surface, the first covering member is located in the avoiding hole.

[0038] In the technical solution of this embodiment, a avoidance hole is provided on the second covering member, so that when the second covering member is provided on the first surface, the first covering member can be located in the avoidance hole, so that the second covering member can cover a larger area of ​​the first surface, reducing the area of ​​the first surface exposed to the outside world, thereby improving the protection effect of the second covering member on the electrode assembly.

[0039] In some embodiments, the avoidance hole includes at least two avoidance side walls, and two adjacent avoidance side walls are connected by rounded corners.

[0040] In the technical solution of this embodiment, the two adjacent avoidance side walls of the avoidance hole are connected by rounded corners. Compared with the two avoidance side walls being directly connected and forming a sharp corner, the setting of the rounded corners can reduce the stress concentration at the connection point of the two avoidance side walls; because the second covering part usually needs to be tensioned to reduce wrinkles after being arranged on the first surface, the setting of the rounded corners can reduce stress concentration, thereby reducing the occurrence of the second covering part being torn during the tensioning process.

[0041] In some embodiments, a distance between a sidewall of the first cover and an adjacent sidewall of the avoidance member is greater than zero.

[0042] In the technical solution of this embodiment, the distance between the side wall of the first cover and the avoidance side wall is made greater than zero, so that the first cover can be accommodated in the avoidance hole, reducing the difficulty of accommodating the first cover in the avoidance hole when the second cover is arranged on the first surface, and at the same time can reduce the situation where the first cover is blocked by the second cover, providing error space for the process of setting the second cover on the first surface in the processing process.

[0043] In some embodiments, a distance between a side wall of the first cover and an adjacent side wall of the avoidance member is less than or equal to 1 mm.

[0044] The technical solution of this embodiment provides a spacing range between the side walls of the first cover and the avoidance side walls to reduce the difficulty of accommodating the first cover in the avoidance hole when the second cover is arranged on the first surface, reduce the occurrence of the first cover being blocked by the second cover, and at the same time reduce the exposed area of ​​the first surface in the space between the side walls of the first cover and the avoidance side walls, so that the second cover can better play the role of protecting the electrode assembly.

[0045] In some embodiments, the surface includes two first surfaces disposed opposite to each other, and the first cover and the second cover are disposed on the same first surface;

[0046] Or the surface includes a first surface surrounding the electrode assembly.

[0047] In the technical solution of this embodiment, the surface of the electrode assembly may include two oppositely arranged first surfaces. In this case, the electrode assembly may be formed by a lamination process or a winding process, and the second covering member may protect a first surface of the electrode assembly; the surface of the electrode assembly may also include a first surface surrounding the electrode assembly. In this case, the electrode assembly is formed by winding; that is, the electrode assembly gluing method can be applied to various types of electrode assemblies, thereby increasing the compatibility of the electrode assembly gluing method.

[0048] In some embodiments, in the step of disposing the second covering member on the surface, a projected area of ​​the second covering member on the first surface is smaller than an area of ​​the first surface.

[0049] In the technical solution of this embodiment, the projected area between the second cover and the first surface is made smaller than the projected area of ​​the first surface, so as to reduce the occurrence of the second cover extending to the first surface, even if the second cover cannot completely cover the first surface; because the second cover extends beyond the first surface to adhere to external impurities (such as dust, metal debris, etc.), it is easy to have a negative impact on the yield of the electrode assembly. This setting can reduce the occurrence of the second cover adhering to foreign matter.

[0050] In some embodiments, a distance between any edge of the projection of the second covering element on the first surface and an adjacent edge of the first surface is greater than zero.

[0051] In the technical solution of this embodiment, the distance between the edge of the projection of the second cover on the first surface and the edge of the adjacent first surface is made greater than zero, that is, there is a gap between any side of the second cover and the edge of the adjacent first surface, so that any side of the second cover is not likely to extend beyond the first surface, thereby reducing the occurrence of debris adhering to the second cover.

[0052] In some embodiments, a distance between an edge of a projection of the second cover on the first surface and an edge of an adjacent first surface is less than or equal to 3 mm.

[0053] The technical solution of this embodiment provides a spacing range between the projected edge of the second cover on the first surface and the adjacent edge of the first surface, so that the second cover is not easily extended beyond the first surface. At the same time, it can also enable the second cover to cover more area of ​​the first surface to better protect the electrode assembly.

[0054] In some embodiments, the surface includes two first surfaces disposed opposite to each other, and the first cover is disposed on either of the two first surfaces;

[0055] The electrode assembly gluing method further includes:

[0056] The third covering member is disposed on the first surface, wherein the third covering member and the first covering member are respectively disposed on different first surfaces.

[0057] In the technical solution of this embodiment, a third cover is provided, and the third cover is provided on the first surface opposite to the first cover, so that the third cover can protect the corresponding first surface; because a first cover is provided on the electrode assembly for the identification device to obtain information, the first cover may not be provided on the first surface corresponding to the third cover. At this time, the third cover does not have the problem of avoiding position and covering information.

[0058] In some embodiments, a distance between any edge of the projection of the third covering element on the first surface and an adjacent edge of the first surface is greater than zero.

[0059] Similar to the second cover, the third cover is also susceptible to debris sticking to it if it extends beyond the first surface. Therefore, in the technical solution of this embodiment, the spacing between the edge of the third cover's projection on the first surface and the adjacent edge of the first surface is greater than zero. This ensures that there is a gap between each side of the third cover and the adjacent edge of the first surface. This prevents either side of the third cover from extending beyond the first surface, thereby reducing the likelihood of debris sticking to the third cover.

[0060] In some embodiments, a distance between an edge of a projection of the third cover on the first surface and an edge of an adjacent first surface is less than or equal to 3 mm.

[0061] The technical solution of this embodiment provides a spacing range between the projected edge of the third cover on the first surface and the adjacent edge of the first surface, so that the third cover is not easily extended beyond the first surface. At the same time, it can also enable the third cover to cover more area of ​​the first surface to better protect the electrode assembly.

[0062] In some embodiments, before the step of providing the first covering member on the surface of the electrode assembly, the electrode assembly adhesive laminating method further comprises:

[0063] The electrode assembly is pre-pressed and shaped.

[0064] In the technical solution of this embodiment, before the step of providing the first covering member on the surface of the electrode assembly, a step of pre-pressing and shaping the electrode assembly is provided to facilitate the adhesion of the first covering member to the electrode assembly.

[0065] In some embodiments, the electrode assembly gluing method further includes:

[0066] The fourth covering member is disposed on two opposite second surfaces of the electrode assembly, wherein the area of ​​the second surface is smaller than that of the first surface, and the second surface is adjacent to the first surface.

[0067] In the technical solution of this embodiment, a fourth cover is provided to protect the two second surfaces opposite to the electrode assembly, so as to cooperate with the second cover to better protect the electrode assembly; at the same time, the area of ​​the second surface is made smaller than the area of ​​the first surface, that is, the first cover is provided on the surface with a larger area of ​​the electrode assembly, so as to reduce the difficulty of fixing the first cover and also facilitate the identification device to identify the information recorded on the first cover.

[0068] In a third aspect, some embodiments of the present application further provide a battery cell, including an electrode assembly formed by the battery assembly gluing method provided by some embodiments of the first aspect; or an electrode assembly provided by some embodiments of the second aspect.

[0069] In a fourth aspect, some embodiments of the present application further provide a battery, comprising the battery cell provided by some embodiments of the third aspect.

[0070] In a fifth aspect, some embodiments of the present application further provide an electrical device, comprising the battery provided in some embodiments of the fourth aspect.

[0071] The above description is only an overview of the technical solution of this application. In order to more clearly understand the technical means of this application, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of this application more obvious and easy to understand, the following are the technical solutions of this application. Specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0073] FIG1 is a schematic structural diagram of an electrical device provided in some embodiments of the present application;

[0074] FIG2 is a schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0075] FIG3 is a schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0076] FIG4 is a schematic front view of an electrode assembly provided in some embodiments of the present application;

[0077] FIG5 is a rear view schematic diagram of an electrode assembly provided in some embodiments of the present application;

[0078] FIG6 is a schematic flow chart of a method for gluing an electrode assembly according to some embodiments of the present application;

[0079] FIG7 is a schematic flow chart of a method for gluing an electrode assembly according to other embodiments of the present application;

[0080] FIG8 is a schematic flow chart of a method for gluing an electrode assembly according to some further embodiments of the present application;

[0081] FIG9 is a flow chart of a method for gluing an electrode assembly according to some other embodiments of the present application.

[0082] The meanings of the marks in the figure are:

[0083] 100. Electrical devices;

[0084] 10. Motor;

[0085] 20. Controller;

[0086] 200, battery;

[0087] 30. Box body; 31. First part; 32. Second part;

[0088] 300, battery cell;

[0089] 41. Shell; 42. End cover;

[0090] 400, electrode assembly;

[0091] 51. First surface; 52. Second surface;

[0092] 60. First covering member;

[0093] 70. Second cover; 71. Avoidance hole; 711. Avoidance side wall; 712. Rounded corner;

[0094] 80. The third covering member.

[0095] Modes for Carrying Out the Invention

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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).

[0102] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0103] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," 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.

[0104] 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.

[0105] During the production process of battery cells, it is usually necessary to stick small adhesive tape with product information (such as QR code adhesive tape, barcode adhesive tape, etc.) on the battery cells to facilitate subsequent production equipment to obtain product parameter information; at the same time, it is also necessary to stick protective adhesive tape on the battery cells to reduce damage to the battery cell's electrodes or diaphragms during production and transportation.

[0106] According to the battery cell processing procedures, after the electrode assembly is formed, a small piece of tape needs to be applied. This allows the relevant equipment in subsequent cold pressing and testing processes to obtain product information. The application of protective tape is usually performed after the cold pressing process. After the electrode assembly is formed, there are usually gaps within it, resulting in a loose overall structure. If the protective tape is applied directly, it will easily cause wrinkles in the tape, which will also negatively affect the shaping and cold pressing processes and easily cause the electrode assembly to wrinkle and other undesirable conditions.

[0107] Since the main function of the small tape is to record product information, the area of ​​the small tape is usually small, and it can be pasted first without causing negative impact on the subsequent processes of the electrode assembly.

[0108] Based on this, according to the process requirements, the small tape will be pasted on the electrode assembly before the protective tape. This will result in the protective tape covering the small tape after the protective tape is pasted, and have a negative impact on the subsequent processing equipment's recognition of product information.

[0109] To facilitate subsequent equipment to recognize the product information recorded on the small tape after the protective tape is applied, the small tape can be applied after the protective tape is applied. However, this will result in the equipment in the various processes (cold pressing, testing, etc.) after the electrode assembly is formed and between the application of the protective tape being applied being unable to directly recognize the product information through the small tape and will have to obtain the product information through other means, which can easily lead to problems such as cumbersome operation and reduced production efficiency.

[0110] Based on the above considerations, in order to solve the problem that the identification device is difficult to recognize the QR code tape after the protective tape is pasted, and at the same time to reduce the negative impact on production efficiency, the embodiment of the present application provides an electrode assembly gluing method, in which a first cover with an information pattern is provided to facilitate the identification equipment in each process to obtain product information, and a second cover is provided to protect the electrode assembly. After the second cover is provided on the electrode assembly, the information pattern can be exposed outside the second cover to reduce the obstruction or covering of the information pattern by the second cover.

[0111] Because the information pattern can be revealed outside the second cover, in such an electrode assembly gluing method, the first cover can be pasted first after the electrode assembly is formed, and the second cover can be pasted after the electrode assembly is cold pressed and other processes, and the information pattern of the first cover is exposed. In this way, when there are no obvious wrinkles on the second cover, the negative impact of the second cover on the first cover, etc. is reduced or avoided, which facilitates the identification equipment in subsequent processes to obtain product information.

[0112] The electrode assembly gluing method disclosed in the embodiments of the present application is used to produce electrode assemblies, which can be used as electrochemical reaction components of battery cells, and battery cells can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0113] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device 100 according to an embodiment of the present application.

[0114] Referring to Figure 1, Figure 1 is a structural diagram of the power-consuming device 100 provided in some embodiments of the present application when it is a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 200 is provided inside the vehicle, and the battery 200 can be provided at the bottom, head or tail of the vehicle. The battery 200 can be used to power the vehicle, for example, the battery 200 can be used as an operating power source for the vehicle. The vehicle may also include a controller 20 and a motor 10, and the controller 20 is used to control the battery 200 to power the motor 10, for example, for starting, navigating and operating power requirements during driving of the vehicle.

[0115] In some embodiments of the present application, the battery 200 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0116] Referring to Figure 2, Figure 2 is a schematic diagram of the exploded structure of a battery 200 provided in some embodiments of the present application. The battery 200 includes a housing 30 and a battery cell 300, and the battery cell 300 is accommodated in the housing 30. The housing 30 is used to provide a storage space for the battery cell 300, and the housing 30 can adopt a variety of structures. In some embodiments, the housing 30 may include a first portion 31 and a second portion 32, the first portion 31 and the second portion 32 covering each other, and the first portion 31 and the second portion 32 jointly define a storage space for accommodating the battery cell 300. The second portion 32 may be a hollow structure with one end open, and the first portion 31 may be a plate-like structure, and the first portion 31 covers the open side of the second portion 32, so that the first portion 31 and the second portion 32 jointly define a storage space; the first portion 31 and the second portion 32 may also be hollow structures with one side open, and the open side of the first portion 31 covers the open side of the second portion 32. Of course, the box body 30 formed by the first part 31 and the second part 32 can be in various shapes, such as a cylinder, a cuboid, etc.

[0117] In the battery 200, there may be multiple battery cells 300, and the multiple battery cells 300 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 300. The multiple battery cells 300 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 300 may be housed within the housing 30. Of course, the battery 200 may also be formed by first connecting multiple battery cells 300 in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the housing 30. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar component for electrically connecting the multiple battery cells 300.

[0118] Each battery cell 300 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 300 may be cylindrical, flat, rectangular, or in other shapes.

[0119] Referring to Figure 3, Figure 3 is a schematic diagram of an exploded view of a battery cell 300 provided in some embodiments of the present application. A battery cell 300 is the smallest unit that makes up a battery 200. As shown, the battery cell 300 includes an end cap 42, a housing 41, an electrode assembly 400, and other functional components.

[0120] The end cap 42 is a component that covers the opening of the housing 41 to isolate the internal environment of the battery cell 300 from the external environment. The shape of the end cap 42 can be adapted to the shape of the housing 41 to fit the housing 41. Optionally, the end cap 42 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 42 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 300. Functional components such as electrode terminals can be provided on the end cap 42. The electrode terminals can be used to electrically connect to the electrode assembly 400 to output or input electrical energy to or from the battery cell 300. In some embodiments, the end cap 42 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. The end cap 42 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this. In some embodiments, an insulating member may be provided inside the end cap 42 to isolate the electrical connection components in the housing 41 from the end cap 42 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0121] The housing 41 is a component that cooperates with the end cap 42 to form the internal environment of the battery cell 300. This internal environment can be used to accommodate the electrode assembly 400, electrolyte, and other components. The housing 41 and end cap 42 can be separate components. An opening can be provided in the housing 41, and the end cap 42 is placed over the opening to form the internal environment of the battery cell 300. Alternatively, the end cap 42 and housing 41 can be integrated. Specifically, the end cap 42 and housing 41 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 41 is to be enclosed, the end cap 42 is placed over the housing 41. The housing 41 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 41 can be determined based on the specific shape and size of the electrode assembly 400. The housing 41 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0122] The electrode assembly 400 is a component in the battery cell 300 where electrochemical reactions occur. One or more electrode assemblies 400 may be contained in the housing 41. The electrode assembly 400 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. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode assembly 400, and the portions of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the electrode assembly 400 or respectively at both ends of the electrode assembly 400. During the charge and discharge process of the battery 200, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0123] In the first aspect, some embodiments of the present application provide an electrode assembly 400, referring to Figures 4 and 5, wherein Figure 4 is a front view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, and Figure 5 is a rear view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application.

[0124] In some embodiments of the present application, the electrode assembly 400 includes: an electrode assembly 400, a first covering member 60 and a second covering member 70; the first covering member 60 is arranged on the surface of the electrode assembly 400, and an information pattern is provided on the first covering member 60; the second covering member 70 is arranged on the surface of the electrode assembly 400, and the information pattern can be exposed outside the second covering member 70.

[0125] The electrode assembly 400 refers to a structure consisting of a diaphragm and an electrode plate; the first cover 60 refers to a structure that can cover part of the surface of the electrode assembly 400, and the first cover 60 is provided with an information pattern to carry product information; the second cover 70 refers to a structure that can cover the surface of the electrode assembly 400.

[0126] The information pattern is exposed outside the second cover 70, which means that the second cover 70 does not block or cover the information pattern, that is, the second cover 70 is not likely to have a negative impact on the recognition of the information pattern, so that the recognition equipment in subsequent processes can recognize the product information recorded in the information pattern.

[0127] In this embodiment, the second covering member 70 covers the surface of the electrode assembly 400, so that the electrode assembly 400 is protected by the second covering member 70, and the impact of the external environment on the electrode assembly 400 is reduced, thereby playing a role in protecting the electrode assembly 400; when the second covering member 70 covers the electrode assembly 400, the information pattern can be exposed outside the second covering member 70, so that the identification device can recognize the information recorded on the first covering member 60.

[0128] 4 , in some embodiments, the second cover 70 is spaced apart from the first cover 60 .

[0129] The second cover 70 and the first cover 60 are arranged at intervals, which means that the second cover 70 and the first cover 60 do not cover each other on the surface of the electrode assembly 400, so as to reduce the situation where the second cover 70 covers the first cover 60, thereby alleviating the negative impact that the second cover 70 may have on the identification of the first cover 60 by the identification equipment in each process.

[0130] In this embodiment, the second cover 70 is spaced apart from the first cover 60 to reduce the impact of the second cover 70 on the first cover 60 , so that the first cover 60 can be better exposed to the outside world, making it easier for identification equipment to recognize the information recorded on the first cover 60 .

[0131] 4 , in some embodiments, the second cover member 70 is provided with an avoidance hole 71 , and the first cover member 60 is accommodated in the avoidance hole 71 .

[0132] The avoidance hole 71 refers to a through hole formed on the second cover 70 . When the second cover 70 is disposed on the surface of the electrode assembly 400 , the first cover 60 can be located in the avoidance hole 71 .

[0133] In this embodiment, a avoidance hole 71 is provided on the second covering member 70, so that when the second covering member 70 is provided on the surface of the electrode assembly 400, the first covering member 60 can be located in the avoidance hole 71, so that the second covering member 70 can cover a larger area of ​​the surface of the electrode assembly 400, reducing the area of ​​the surface of the electrode assembly 400 exposed to the outside, thereby improving the protective effect of the second covering member 70 on the electrode assembly 400.

[0134] 4 , in some embodiments, the avoidance hole 71 includes at least two avoidance side walls 711 , and two adjacent avoidance side walls 711 are connected by a rounded corner 712 .

[0135] The avoidance side wall 711 refers to the side wall of the avoidance hole 71, and multiple avoidance side walls 711 can form the avoidance hole 71; two adjacent avoidance side walls 711 are connected by a rounded corner 712, that is, two adjacent avoidance side walls 711 are provided with a rounded corner 712; compared with the two adjacent avoidance side walls 711 being directly connected and forming an edge, the setting of the rounded corner 712 can reduce stress concentration.

[0136] Since the second covering member 70 usually needs to be tensioned to reduce wrinkles after being arranged on the surface of the electrode assembly 400, accordingly, this embodiment connects the two adjacent avoidance side walls 711 of the avoidance hole 71 through a rounded corner 712. Compared with the two avoidance side walls 711 being directly connected and forming a sharp corner, the setting of the rounded corner 712 can reduce the stress concentration at the connection point between the two avoidance side walls 711, thereby reducing the occurrence of the second covering member 70 being torn during the tensioning process.

[0137] 4 , in some embodiments, the distance between the sidewall of the first covering member 60 and the adjacent avoidance sidewall 711 is greater than zero.

[0138] The side walls of the first cover 60 refer to the wall surfaces around the first cover 60. When the first cover 60 is accommodated in the avoidance hole 71, the distance between the side walls of the first cover 60 and the avoidance side walls 711 is greater than zero, that is, the area of ​​the avoidance hole 71 is greater than the area of ​​the first cover 60; the distance between the side walls of the first cover 60 and the avoidance side walls 711 can reduce the requirements of the process on the equipment accuracy, thereby reducing the processing difficulty and improving the product yield.

[0139] In this embodiment, the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is greater than zero, so that the first cover 60 can be accommodated in the avoidance hole 71, reducing the difficulty of accommodating the first cover 60 in the avoidance hole 71 when the second cover 70 is arranged on the surface of the electrode assembly 400, and at the same time, it can reduce the occurrence of the first cover 60 being blocked by the second cover 70, providing error space for the process of setting the second cover 70 on the surface of the electrode assembly 400 in the processing process.

[0140] 4 , in some embodiments, the spacing between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is less than or equal to 1 mm. Specifically, the spacing may be 1 mm, 0.8 mm, 0.6 mm, 0.4 mm, 0.2 mm, 0.1 mm or other values.

[0141] The distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is the distance shown as h in the figure. The larger the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711, the lower the precision requirement for the equipment in step S902, but the larger the surface area of ​​the electrode assembly 400 exposed to the outside world, that is, the worse the protection effect of the second cover 70 on the electrode assembly 400; the smaller the distance, the higher the precision requirement for the equipment in step S902, and the better the protection effect of the second cover 70 on the electrode assembly 400.

[0142] The distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is less than or equal to 1 mm, which can easily adapt to the equipment accuracy in step S902 and enable the second cover 70 to have a better protection effect on the electrode assembly 400.

[0143] This embodiment provides some spacing ranges between the side walls of the first cover 60 and the avoidance side walls 711 to reduce the difficulty of the first cover 60 being accommodated in the avoidance hole 71 when the second cover 70 is arranged on the surface of the electrode assembly 400, reduce the occurrence of the first cover 60 being blocked by the second cover 70, and at the same time reduce the exposed area of ​​the surface of the electrode assembly 400 in the space between the side walls of the first cover 60 and the avoidance side walls 711, so that the second cover 70 can better play the role of protecting the electrode assembly 400.

[0144] 4 , in some embodiments, the surface of the electrode assembly 400 includes two oppositely disposed first surfaces 51 , the first cover 60 and the second cover 70 are disposed on the same first surface 51 ; or the surface of the electrode assembly 400 includes a first surface 51 surrounding the electrode assembly 400 .

[0145] When the surface of the electrode assembly 400 includes two opposing first surfaces 51, that is, the electrode assembly 400 has multiple different surfaces, the electrode assembly 400 can be formed by a lamination process or a winding process. The second cover 70 and the first cover 60 are disposed on the same first surface 51. That is, the second cover 70 is only disposed on one of the first surfaces 51 and does not cover other surfaces of the electrode assembly 400. In other words, there are other surfaces on the side of the electrode assembly 400 that are not covered by the second cover 70.

[0146] When the surface of the electrode assembly 400 includes a first surface 51 that surrounds the electrode assembly 400 , that is, the electrode assembly 400 includes a first surface 51 that is continuous and surrounds the electrode assembly 400 , the electrode assembly 400 may be formed by a winding process.

[0147] In the technical solution of this embodiment, the surface of the electrode assembly 400 may include two oppositely arranged first surfaces 51. In this case, the electrode assembly 400 may be formed by a lamination process or a winding process, and the second covering member 70 may protect a first surface 51 of the electrode assembly 400. The surface of the electrode assembly 400 may also include a first surface 51 surrounding the electrode assembly 400. In this case, the electrode assembly 400 is formed by winding. That is, the electrode assembly gluing method can be applied to various different types of electrode assemblies 400, thereby increasing the compatibility of the electrode assembly gluing method.

[0148] 4 , in some embodiments, a distance between any edge of the projection of the second cover 70 on the first surface 51 and an adjacent edge of the first surface 51 is greater than zero.

[0149] The distance between any edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H1 in the figure. This setting means that any point of the projection of the second cover 70 on the first surface 51 is not likely to extend beyond the first surface 51.

[0150] Because the second cover 70 extends beyond the first surface 51, it is susceptible to the adhesion of dust, metal debris, or other foreign matter. Foreign matter adhering to the second cover 70 may negatively impact the electrode assembly 400. Accordingly, in this embodiment, the spacing between the edge of the second cover 70 projected onto the first surface 51 and the adjacent edge of the first surface 51 is greater than zero. This ensures that a gap exists between each side of the second cover 70 and the adjacent edge of the first surface 51. This prevents either side of the second cover 70 from extending beyond the first surface 51, thereby reducing the likelihood of foreign matter adhering to the second cover 70.

[0151] Referring to Figure 4, in some embodiments, the distance between the edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is less than or equal to 3 mm. Specifically, the distance can be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or other values.

[0152] The distance between any edge of the projection of the second covering member 70 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H1 in the figure; the larger the distance between any edge of the projection of the second covering member 70 on the first surface 51 and the edge of the adjacent first surface 51, the lower the precision requirement for the equipment in step S904, but the larger the area of ​​the first surface 51 exposed to the outside world, that is, the worse the protection effect of the second covering member 70 on the electrode assembly 400; the smaller the distance, the higher the precision requirement for the equipment in step S904, and the better the protection effect of the second covering member 70 on the electrode assembly 400.

[0153] The distance between any edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is less than or equal to 3 mm, which can not only more easily adapt to the equipment precision in step S902, but also enable the second cover 70 to have a better protective effect on the electrode assembly 400.

[0154] This embodiment provides a spacing range between the projected edge of the second cover 70 on the first surface 51 and the adjacent edge of the first surface 51, so that the second cover 70 is not easily extended beyond the first surface 51. At the same time, it can also enable the second cover 70 to cover more area of ​​the first surface 51 to better protect the electrode assembly 400.

[0155] On the second aspect, some embodiments of the present application also provide a method for gluing an electrode assembly, referring to Figures 4 to 6, wherein Figure 4 is a front view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, Figure 5 is a rear view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, and Figure 6 is a flow chart of the method for gluing an electrode assembly provided in some embodiments of the present application.

[0156] In some embodiments of the present application, the electrode assembly gluing method includes:

[0157] S901 : a first cover 60 is provided on the surface of the electrode assembly 400 , and an information pattern is provided on the first cover 60 .

[0158] Among them, similar to some embodiments of the first aspect, the electrode assembly 400 refers to a structure composed of a diaphragm and a pole piece. The electrode assembly 400 is used to generate an electrochemical reaction. The electrode assembly 400 can form the diaphragm, the positive pole piece and the negative pole piece through a lamination process, or can form the diaphragm, the positive pole piece and the negative pole piece through a winding process. Therefore, the surface of the electrode assembly 400 may include multiple different surfaces, or may include a surface surrounding the electrode assembly 400.

[0159] The first cover 60 refers to a structure that can cover part of the surface of the electrode assembly 400; the first cover 60 is provided with an information pattern to carry product information, and the information pattern can be text, or a barcode, a QR code or other pattern; the material of the first cover 60 can be paper, plastic or other materials; the shape of the first cover 60 can be round, square or other shapes; the first cover 60 can be pasted on the surface of the electrode assembly 400, or can be provided on the surface of the electrode assembly 400 by other methods.

[0160] Since the main function of the first cover 60 is to record product information, the area of ​​the first cover 60 does not need to be too large, that is, the first cover 60 can only cover a portion of the surface of the electrode assembly 400 .

[0161] S902 : placing a second cover 70 on the surface, with the information pattern exposed outside the second cover 70 .

[0162] The second cover 70 refers to a structure that can cover the surface of the electrode assembly 400. The second cover 70 is used to protect the surface of the corresponding electrode assembly 400. The material of the second cover 70 can be paper, plastic or other materials. The shape of the second cover 70 can be round, square or other shapes. The second cover 70 can be pasted on the surface of the electrode assembly 400, or it can be set on the surface of the electrode assembly 400 by other methods.

[0163] The second cover 70 may cover only part of the surface of the electrode assembly 400 or the entire surface of the electrode assembly 400 . The second cover 70 may protect the electrode assembly 400 to reduce the impact of the external environment on the electrode assembly 400 .

[0164] The information pattern is exposed outside the second cover 70, which means that the second cover 70 does not block or cover the information pattern, that is, the second cover 70 is not likely to have a negative impact on the recognition of the information pattern, so that the recognition equipment in subsequent processes can recognize the product information recorded in the information pattern.

[0165] Regarding the specific method of revealing the information pattern outside the second cover 70; in some embodiments, the second cover 70 and the first cover 60 can be spaced apart so that the second cover 70 and the first cover 60 do not cover each other; in other embodiments, because the information pattern usually does not cover the entire first cover 60, the second cover 70 can cover the edge of the first cover 60 to reveal the information pattern to the outside world; it can be understood that revealing the information pattern outside the second cover 70 can also be achieved in other ways, for example, by changing the shape of the first cover 60, changing the shape of the second cover 70, etc., and is not limited to the above two methods.

[0166] In this embodiment, an information pattern is provided on the first cover 60 so that the identification device can identify the information recorded in the information pattern, and the first cover 60 is first provided on the surface of the electrode assembly 400 to meet the processing requirements, so that the identification devices of the subsequent processes can more easily obtain product information; the second cover 70 covers the surface of the electrode assembly 400, so that the electrode assembly 400 is protected by the second cover 70, and the impact of the external environment on the electrode assembly 400 is reduced, so as to play a role in protecting the electrode assembly 400; when the second cover 70 covers the electrode assembly 400, the information pattern can be exposed outside the second cover 70, so that the identification device can identify the information recorded on the first cover 60.

[0167] In some embodiments, in the step of disposing the second cover 70 on the surface, ie, in step S902 , the second cover 70 is spaced apart from the first cover 60 .

[0168] Similar to some embodiments of the first aspect, the second covering member 70 and the first covering member 60 are arranged at intervals, which means that the second covering member 70 and the first covering member 60 do not cover each other on the surface of the electrode assembly 400, so as to reduce the situation where the second covering member 70 covers the first covering member 60, thereby alleviating the negative impact that the second covering member 70 may have on the identification of the first covering member 60 by the identification equipment in each process.

[0169] Under the premise that the second cover 70 is spaced apart from the first cover 60, the second cover 70 should cover as much area of ​​the first surface 51 as possible to protect a larger area of ​​the electrode assembly 400. Accordingly, the spacing between the second cover 70 and the first cover 60 can be achieved in various ways. In some embodiments, the first cover 60 can be arranged at the edge of the first surface 51. In this case, the second cover 70 can cover a larger area of ​​the first surface 51 to better protect the electrode assembly 400. In other embodiments, a window can also be provided on the second cover 70. When the second cover 70 is provided on the first surface 51, the window is opposite to the first cover 60, so that the second cover 70 can be spaced apart from the first cover 60 without covering each other, and the second cover 70 can cover a larger area of ​​the first surface 51 to better protect the electrode assembly 400. It can be understood that the spacing between the second cover 70 and the first cover 60 can also be achieved in other ways, and can also be achieved by changing the shape of the first cover 60, changing the shape of the second cover 70, etc., and is not limited to the above two methods.

[0170] In this embodiment, the second cover 70 is spaced apart from the first cover 60 to reduce the impact of the second cover 70 on the first cover 60 , so that the first cover 60 can be better exposed to the outside world, making it easier for identification equipment to recognize the information recorded on the first cover 60 .

[0171] According to some embodiments of the present application, refer to Figures 4, 5, and 7, wherein Figure 4 is a front view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, Figure 5 is a rear view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, and Figure 7 is a flow chart of the step of setting the avoidance hole 71 in the electrode assembly gluing method provided in some embodiments of the present application.

[0172] In some embodiments of the present application, before the step of providing the second cover 70 on the surface, that is, before step S902 , the electrode assembly gluing method further includes:

[0173] S903 : providing a second cover member 70 , and setting a position-avoiding hole 71 on the second cover member 70 .

[0174] Similar to some embodiments of the first aspect, the avoidance hole 71 refers to a through hole formed on the second cover 70. When the second cover 70 is arranged on the surface of the electrode assembly 400, the first cover 60 can be located in the avoidance hole 71; the avoidance hole 71 can be arranged at any position of the second cover 70. For example, the avoidance hole 71 can be arranged at the edge, corner, center or other position of the second cover 70. The specific position of the avoidance hole 71 is determined according to the position of the first cover 60; the shape of the avoidance hole 71 can be square, circular or other shapes, and the shape of the avoidance hole 71 can also be determined according to the shape of the first cover 60; the avoidance hole 71 can be formed on the second cover 70 by laser processing, stamping or other methods.

[0175] The step S903 is mainly used to set the avoidance hole 71 on the second cover 70 , so the step S903 can be set between S901 and S902 , or before S901 .

[0176] In step S902, the first covering member 60 is located in the avoidance hole 71, that is, when the second covering member 70 is arranged on the surface of the electrode assembly 400, the avoidance hole 71 is opposite to the first covering member 60, so that after the second covering member 70 is arranged on the surface of the electrode assembly 400, the first covering member 60 can be located in the avoidance hole 71.

[0177] In this embodiment, a avoidance hole 71 is provided on the second covering member 70, so that when the second covering member 70 is provided on the surface of the electrode assembly 400, the first covering member 60 can be located in the avoidance hole 71, so that the second covering member 70 can cover a larger area of ​​the surface of the electrode assembly 400, reducing the area of ​​the surface of the electrode assembly 400 exposed to the outside, thereby improving the protective effect of the second covering member 70 on the electrode assembly 400.

[0178] 4 , in some embodiments, the avoidance hole 71 includes at least two avoidance side walls 711 , and two adjacent avoidance side walls 711 are connected by a rounded corner 712 .

[0179] Similar to some embodiments of the first aspect, the avoidance side wall 711 refers to the side wall of the avoidance hole 71 , and a plurality of avoidance side walls 711 can form the avoidance hole 71 .

[0180] Depending on the shape of the avoidance hole 71, there are at least two avoidance side walls 711. For example, when the avoidance hole 71 is square, there are four avoidance side walls 711; for another example, when the avoidance hole 71 is triangular, there are three avoidance side walls 711; for another example, when the avoidance hole 71 is elliptical, there are two avoidance side walls 711.

[0181] Two adjacent avoidance side walls 711 are connected by rounded corners 712, that is, two adjacent avoidance side walls 711 are provided with rounded corners 712; compared with two adjacent avoidance side walls 711 being directly connected and forming edges, the setting of the rounded corners 712 can reduce stress concentration.

[0182] After the second cover 70 is arranged on the surface of the electrode assembly 400, it is usually necessary to stretch the second cover 70 to reduce wrinkles. At this time, the rounded corner 712 of the avoidance hole 71 can reduce the stress concentration at the intersection of two adjacent avoidance side walls 711, thereby reducing the occurrence of tearing.

[0183] Since the second covering member 70 usually needs to be tensioned to reduce wrinkles after being arranged on the surface of the electrode assembly 400, accordingly, this embodiment connects the two adjacent avoidance side walls 711 of the avoidance hole 71 through a rounded corner 712. Compared with the two avoidance side walls 711 being directly connected and forming a sharp corner, the setting of the rounded corner 712 can reduce the stress concentration at the connection point between the two avoidance side walls 711, thereby reducing the occurrence of the second covering member 70 being torn during the tensioning process.

[0184] 4 , in some embodiments, the distance between the sidewall of the first covering member 60 and the adjacent avoidance sidewall 711 is greater than zero.

[0185] Similar to some embodiments of the first aspect, the side wall of the first covering member 60 refers to the wall surfaces around the first covering member 60. When the first covering member 60 is accommodated in the avoidance hole 71, the distance between the side wall of the first covering member 60 and the avoidance side wall 711 is greater than zero, that is, the area of ​​the avoidance hole 71 is greater than the area of ​​the first covering member 60.

[0186] Because the second cover 70 needs to make the avoidance hole 71 opposite to the first cover 60 when it is arranged on the surface of the electrode assembly 400, and the second cover 70 needs to reduce the obstruction of the first cover 60 after the second cover 70 is arranged on the surface of the electrode assembly 400, there are precision requirements for the corresponding equipment in the step S902; and the distance between the side wall of the first cover 60 and the avoidance side wall 711 can reduce the equipment precision requirements of this process, thereby reducing the processing difficulty and improving the product yield.

[0187] In this embodiment, the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is greater than zero, so that the first cover 60 can be accommodated in the avoidance hole 71, reducing the difficulty of accommodating the first cover 60 in the avoidance hole 71 when the second cover 70 is arranged on the surface of the electrode assembly 400, and at the same time, it can reduce the occurrence of the first cover 60 being blocked by the second cover 70, providing error space for the process of setting the second cover 70 on the surface of the electrode assembly 400 in the processing process.

[0188] 4 , in some embodiments, the spacing between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is less than or equal to 1 mm. Specifically, the spacing may be 1 mm, 0.8 mm, 0.6 mm, 0.4 mm, 0.2 mm, 0.1 mm or other values.

[0189] Similar to some embodiments of the first aspect, the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is the distance shown by h in the figure. Theoretically, this distance can be 0. When the second cover 70 covers the edge of the first cover 60, the distance can also be a negative number. Affected by the accuracy of the processing equipment, the distance of 0 can easily cause the second cover 70 to block part of the first cover 60, thereby having a negative impact on the identification device's recognition of the product information recorded on the first cover 60.

[0190] The larger the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711, the lower the precision requirement for the equipment in step S902, but the larger the surface area of ​​the electrode assembly 400 exposed to the outside world, that is, the worse the protection effect of the second cover 70 on the electrode assembly 400; the smaller the distance, the higher the precision requirement for the equipment in step S902, and the better the protection effect of the second cover 70 on the electrode assembly 400.

[0191] The distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is less than or equal to 1 mm, which can easily adapt to the equipment accuracy in step S902 and enable the second cover 70 to have a better protection effect on the electrode assembly 400.

[0192] This embodiment provides some spacing ranges between the side walls of the first cover 60 and the avoidance side walls 711 to reduce the difficulty of the first cover 60 being accommodated in the avoidance hole 71 when the second cover 70 is arranged on the surface of the electrode assembly 400, reduce the occurrence of the first cover 60 being blocked by the second cover 70, and at the same time reduce the exposed area of ​​the surface of the electrode assembly 400 in the space between the side walls of the first cover 60 and the avoidance side walls 711, so that the second cover 70 can better play the role of protecting the electrode assembly 400.

[0193] According to some embodiments of the present application, refer to Figure 3, Figure 4, and Figure 5, where Figure 3 is a schematic diagram of the exploded structure of the battery cell 300 provided in some embodiments of the present application, Figure 4 is a schematic diagram of the front view of the electrode assembly 400 provided in some embodiments of the present application, and Figure 5 is a schematic diagram of the rear view of the electrode assembly 400 provided in some embodiments of the present application.

[0194] In some embodiments of the present application, the surface of the electrode assembly 400 includes two oppositely arranged first surfaces 51, and the first covering member 60 and the second covering member 70 are arranged on the same first surface 51; or the surface of the electrode assembly 400 includes a first surface 51 surrounding the electrode assembly 400.

[0195] Similar to some embodiments of the first aspect, when the surface of the electrode assembly 400 includes two oppositely disposed first surfaces 51, that is, the electrode assembly 400 has multiple different surfaces, the electrode assembly 400 can be formed by a lamination process or a winding process. The second cover 70 and the first cover 60 are disposed on the same first surface 51, that is, the second cover 70 is only disposed on a certain first surface 51 and does not cover other surfaces of the electrode assembly 400. In other words, there are other surfaces on the side of the electrode assembly 400 that are not covered by the second cover 70.

[0196] When the surface of the electrode assembly 400 includes a first surface 51 that surrounds the electrode assembly 400, that is, the electrode assembly 400 includes a first surface 51 that is continuous and surrounds the electrode assembly 400, then the electrode assembly 400 can be formed by a winding process. Since the second covering member 70 is used to cover the portion of the first surface 51 that is not covered by the first covering member 60, the second covering member 70 can surround the electrode assembly 400 and cover most of the area of ​​the first surface 51. Since the first surface 51 is a continuous surface that surrounds the electrode assembly 400, the second covering member 70 can cover most of the area of ​​the side of the electrode assembly 400.

[0197] In the technical solution of this embodiment, the surface of the electrode assembly 400 may include two oppositely arranged first surfaces 51. In this case, the electrode assembly 400 may be formed by a lamination process or a winding process, and the second covering member 70 may protect a first surface 51 of the electrode assembly 400. The surface of the electrode assembly 400 may also include a first surface 51 surrounding the electrode assembly 400. In this case, the electrode assembly 400 is formed by winding. That is, the electrode assembly gluing method can be applied to various different types of electrode assemblies 400, thereby increasing the compatibility of the electrode assembly gluing method.

[0198] 4 and 5 , in some embodiments, in the step of disposing the second cover 70 on the surface, ie, in step S902 , the projected area of ​​the second cover 70 on the first surface 51 is smaller than the area of ​​the first surface 51 .

[0199] The projected area of ​​the second cover 70 on the first surface 51 is the area that the second cover 70 can cover. The projected area of ​​the second cover 70 and the first surface 51 is smaller than the area of ​​the first surface 51, which means that the second cover 70 cannot completely cover the first surface 51. The second cover 70 does not cover the edge of the first surface 51, making it difficult for the second cover 70 to extend beyond the first surface 51.

[0200] It can be understood that the main function of the second cover 70 is to protect the corresponding first surface 51. Under the premise that it is not easy to extend beyond the first surface 51, the difference between the projected area of ​​the second cover 70 on the first surface 51 and the area of ​​the first surface 51 should be small, so that the second cover 70 can cover more area of ​​the first surface 51, thereby better protecting the first surface 51.

[0201] Because the second cover 70 extends beyond the first surface 51, it is easy for dust, metal debris or other external impurities to adhere to it. The external impurities adhered to the second cover 70 may have a negative impact on the electrode assembly 400. For example, the metal debris adhered to the second cover 70 may enter the electrode assembly 400 and cause a short circuit.

[0202] Accordingly, in this embodiment, the projected area of ​​the second cover 70 on the first surface 51 is smaller than the projected area of ​​the first surface 51, even if the second cover 70 cannot completely cover the first surface 51, so as to reduce the occurrence of the second cover 70 extending to the edge of the first surface 51 or even beyond the edge; because the second cover 70 extends beyond the first surface 51 to adhere to external impurities, it is easy to have a negative impact on the yield of the electrode assembly 400. This arrangement can reduce the occurrence of impurities adhering to the second cover 70.

[0203] 4 , in some embodiments, a distance between any edge of the projection of the second cover 70 on the first surface 51 and an adjacent edge of the first surface 51 is greater than zero.

[0204] Similar to some embodiments of the first aspect, the distance between any edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H1 in the figure. This setting means that any point of the projection of the second cover 70 on the first surface 51 is not easy to extend beyond the first surface 51, that is, the projection of the second cover 70 on the first surface 51 can fall completely on the first surface 51; when the second cover 70 is provided on the first surface 51, any edge of the second cover 70 is not easy to extend beyond the first surface 51.

[0205] In this embodiment, the distance between the edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is greater than zero, that is, there is a gap between any side of the second cover 70 and the edge of the adjacent first surface 51, so that any side of the second cover 70 is not likely to extend beyond the first surface 51, thereby reducing the occurrence of debris adhering to the second cover 70.

[0206] Referring to Figure 4, in some embodiments, the distance between the edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is less than or equal to 3 mm. Specifically, the distance can be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or other values.

[0207] Similar to some embodiments of the first aspect, the distance between any edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H1 in the figure; because the second cover 70 is used to protect the first surface 51, the distance can theoretically be 0, but due to the accuracy of the processing equipment, the distance of 0 can easily cause the second cover 70 to extend beyond the first surface 51, thereby easily adhering impurities and easily causing negative effects on the electrode assembly 400.

[0208] The larger the distance between any edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51, the lower the precision requirement for the equipment in step S902, but the larger the area of ​​the first surface 51 exposed to the outside world, that is, the worse the protection effect of the second cover 70 on the electrode assembly 400; the smaller the distance, the higher the precision requirement for the equipment in step S902, and the better the protection effect of the second cover 70 on the electrode assembly 400.

[0209] The distance between any edge of the projection of the second cover 70 on the first surface 51 and the edge of the adjacent first surface 51 is less than or equal to 3 mm, which can not only more easily adapt to the equipment precision in step S902, but also enable the second cover 70 to have a better protective effect on the electrode assembly 400.

[0210] This embodiment provides a spacing range between the projected edge of the second cover 70 on the first surface 51 and the adjacent edge of the first surface 51, so that the second cover 70 is not easily extended beyond the first surface 51. At the same time, it can also enable the second cover 70 to cover more area of ​​the first surface 51 to better protect the electrode assembly 400.

[0211] According to some embodiments of the present application, refer to Figures 4, 5, and 8, wherein Figure 4 is a front view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, Figure 5 is a rear view schematic diagram of the electrode assembly 400 provided in some embodiments of the present application, and Figure 8 is a flow diagram of the electrode assembly gluing method provided in some embodiments of the present application including the third covering member 80.

[0212] In some embodiments of the present application, the surface of the electrode assembly 400 includes two first surfaces 51 disposed opposite to each other, and the first covering member 60 is disposed on either of the two first surfaces 51 ;

[0213] The electrode assembly gluing method further includes:

[0214] S904 : disposing the third cover 80 on the first surface 51 , wherein the third cover 80 and the first cover 60 are respectively disposed on different first surfaces 51 .

[0215] The third cover 80 refers to a structure that can cover the first surface 51. The third cover 80 is used to protect the corresponding first surface 51. The material of the third cover 80 can be paper, plastic or other materials. The shape of the third cover 80 can be round, square or other shapes. The third cover 80 can be adhered to the first surface 51 or can be set on the first surface 51 by other methods.

[0216] The third cover 80 may cover only a portion of the first surface 51 or the entire first surface 51 . The third cover 80 may protect the corresponding first surface 51 to reduce the impact of the external environment on the first surface 51 .

[0217] The third cover 80 and the first cover 60 are located on different first surfaces 51. Since the second cover 70 is provided on the first surface 51 where the first cover 60 is located to protect the corresponding first surface 51, the third cover 80 is provided on the first surface 51 opposite to the first cover 60 to protect the first surface 51. Since the third cover 80 and the first cover 60 are provided on different first surfaces 51, the third cover 80 does not need to consider blocking the first cover 60, and the third cover 80 should cover more area of ​​the corresponding first surface 51 to better provide a protective effect.

[0218] In this embodiment, a third cover 80 is provided, and the third cover 80 is provided on the first surface 51 opposite to the first cover 60, so that the third cover 80 can protect the corresponding first surface 51; because a first cover 60 is provided on the electrode assembly 400 for the identification device to obtain information, the first cover 60 may not be provided on the first surface 51 corresponding to the third cover 80. At this time, the third cover 80 does not have the problem of avoiding position and covering information.

[0219] 5 , in some embodiments, a distance between any edge of the projection of the third cover 80 on the first surface 51 and an adjacent edge of the first surface 51 is greater than zero.

[0220] The distance between any edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H2 in the figure. This setting means that any point of the projection of the third cover 80 on the first surface 51 is not likely to extend beyond the first surface 51, that is, the projection of the third cover 80 on the first surface 51 can fall completely on the first surface 51; when the third cover 80 is set on the first surface 51, any edge of the third cover 80 is not likely to extend beyond the first surface 51.

[0221] It can be understood that the main function of the third cover 80 is to protect the corresponding first surface 51. Under the premise that it is not easy to extend beyond the first surface 51, the distance between any edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51 should be small, so that the third cover 80 can cover more area of ​​the first surface 51, thereby better protecting the first surface 51.

[0222] Because the third cover 80 extends beyond the first surface 51, it is easy for dust, metal debris or other external impurities to adhere to it. The external impurities adhered to the third cover 80 may have a negative impact on the electrode assembly 400. For example, the metal debris adhered to the third cover 80 may enter the electrode assembly 400 and cause a short circuit.

[0223] Accordingly, similar to the second cover 70 in some embodiments, this embodiment makes the distance between the edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51 greater than zero, that is, there is a gap between any side of the third cover 80 and the edge of the adjacent first surface 51, so that any side of the third cover 80 is not easy to extend beyond the first surface 51, thereby reducing the occurrence of debris adhering to the third cover 80.

[0224] Referring to Figure 5, in some embodiments, the distance between the edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51 is less than or equal to 3 mm. Specifically, the distance can be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or other values.

[0225] The distance between any edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H2 in the figure; because the third cover 80 is used to protect the first surface 51, the distance can theoretically be 0, but due to the accuracy of the processing equipment, the distance of 0 can easily cause the third cover 80 to extend beyond the first surface 51, thereby easily adhering impurities and easily causing negative effects on the electrode assembly 400.

[0226] The larger the distance between any edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51, the lower the precision requirement for the equipment in step S904, but the larger the area of ​​the first surface 51 exposed to the outside world, that is, the worse the protection effect of the third cover 80 on the electrode assembly 400; the smaller the distance, the higher the precision requirement for the equipment in step S904, and the better the protection effect of the third cover 80 on the electrode assembly 400.

[0227] The distance between any edge of the projection of the third cover 80 on the first surface 51 and the edge of the adjacent first surface 51 is less than or equal to 3 mm, which can not only more easily adapt to the equipment precision in step S902, but also enable the third cover 80 to have a better protective effect on the electrode assembly 400.

[0228] This embodiment provides a spacing range between the projected edge of the third cover 80 on the first surface 51 and the adjacent edge of the first surface 51, so that the third cover 80 is not easily extended beyond the first surface 51. At the same time, it can also enable the third cover 80 to cover more area of ​​the first surface 51 to better protect the electrode assembly 400.

[0229] According to some embodiments of the present application, refer to Figure 9, which is a schematic flow chart of the electrode assembly gluing method provided in some embodiments of the present application.

[0230] In some embodiments of the present application, before step S901, the electrode assembly gluing method further includes:

[0231] S906: Pre-pressing and shaping the electrode assembly 400.

[0232] During the manufacture of the electrode assembly 400, the positive electrode sheet, separator, negative electrode sheet, and separator are typically stacked in the order of layers to form the electrode assembly 400. If the internal gaps within the electrode assembly 400 are large and the electrode assembly 400 is relatively loose, this can easily lead to loose adhesion between the separator and the electrode sheets, wrinkling of the separator, and loosening of the electrode assembly 400. This, in turn, can increase the resistance to lithium ions being deintercalated from the positive electrode and then intercalated into the negative electrode, leading to lithium deposition. After long-term cycling, lithium dendrites can form, penetrating the coated separator and causing an internal short circuit in the electrode assembly 400, potentially leading to safety hazards.

[0233] In order to reduce the pores inside the electrode assembly 400 and reduce the bulkiness of the electrode assembly 400, it is necessary to pre-press and shape the positive electrode sheet, the diaphragm and the negative electrode sheet after they are stacked to form the electrode assembly 400, so as to reduce the gap inside the electrode assembly 400, make the diaphragm and the electrode sheet bonded more tightly, and enable the electrode assembly 400 to form the desired shape.

[0234] At the same time, compared with the fluffy electrode assembly 400, the first cover 60 is easier to be set on the pre-pressed and shaped electrode assembly 400, and setting step S906 before step S901 can also reduce the negative impact of the first cover 60 on the pre-pressing and shaping.

[0235] In this embodiment, before providing the electrode assembly 400 having two oppositely disposed first surfaces 51 , a step of pre-pressing and shaping the electrode assembly 400 is provided to facilitate the adhesion of the first cover 60 to the electrode assembly 400 .

[0236] 9 , in some embodiments, before step S906 , the electrode assembly gluing method further includes:

[0237] S905: providing a plurality of electrode sheets and diaphragms, and laminating the electrode sheets and diaphragms to obtain an electrode assembly 400.

[0238] The electrode sheets include positive electrode sheets and negative electrode sheets. The positive electrode sheets and negative electrode sheets are stacked, and a separator is set between adjacent positive electrode sheets and negative electrode sheets. The stacked positive electrode sheets, negative electrode sheets and separators are then laminated to obtain the electrode assembly 400.

[0239] Lamination processing refers to a method of forming the electrode assembly 400, which corresponds to the winding process; in some embodiments, the lamination processing method can be to set a separator on both sides of the negative electrode sheet, and make the negative electrode sheet and the separator bend in an S shape, and there are multiple stacked flat parts in the bent negative electrode sheet, and then the positive electrode sheet is cut off, and the cut positive electrode sheet is placed between the two opposite flat parts of the bent negative electrode sheet; in other embodiments, both the positive electrode sheet and the negative electrode sheet can be cut off, and the positive electrode sheet and the negative electrode sheet can be alternately stacked, and then a separator is set between adjacent positive and negative electrode sheets; it can be understood that lamination processing can also be achieved in other ways, not limited to the above two ways.

[0240] In this embodiment, the electrode assembly 400 is formed by a lamination process. Since the lamination process requires the second cover 70 to protect the electrode assembly 400, the electrode assembly 400 is limited to being formed by the lamination process so that the electrode assembly gluing method can not only protect the electrode assembly 400, but also facilitate the identification device to obtain information.

[0241] Referring to FIG9 , in some embodiments, the electrode assembly gluing method further includes:

[0242] S909 : Dispose a fourth covering member on two opposite second surfaces 52 of the electrode assembly 400 , wherein the area of ​​the second surface 52 is smaller than that of the first surface 51 , and the second surface 52 is adjacent to the first surface 51 .

[0243] The second surface 52 refers to a surface of the electrode assembly 400 that is adjacent to the first surface 51 . The electrode assembly 400 has two second surfaces 52 , and the two second surfaces 52 are disposed opposite to each other.

[0244] The area of ​​the second surface 52 is smaller than that of the first surface 51, that is, the first surface 51 is the surface with a larger area of ​​the electrode assembly 400, and the first cover 60 is arranged on the surface with a larger area of ​​the electrode assembly 400 to facilitate the identification equipment in each process or the product information recorded on the first cover 60; at the same time, because the first cover 60 is usually facing upward to facilitate identification and acquisition of information, arranging the first cover 60 on the surface with a larger area of ​​the electrode assembly 400 can also make the other first surface 51 opposite to the first cover 60 contact with the conveying device, and because the area of ​​the first surface 51 is larger, this arrangement can make the electrode assembly 400 more stable during the conveying process, and is not prone to displacement, tipping or flipping.

[0245] The fourth cover refers to a structure that can cover the second surface 52, and the fourth cover is used to protect the corresponding second surface 52; the material of the fourth cover can be paper, plastic or other materials; the shape of the fourth cover can be round, square or other shapes; the fourth cover can be adhered to the second surface 52, and can also be provided on the second surface 52 by other methods.

[0246] The fourth cover may cover only a portion of the second surface 52 or the entire second surface 52 . The fourth cover may protect the corresponding second surface 52 to reduce the impact of the external environment on the second surface 52 .

[0247] Step S909 is used to place the fourth cover on the two opposite second surfaces 52. This step can be set before or after step S902. That is, this application does not impose any special restrictions on the order of setting the second cover 70 and the fourth cover.

[0248] In this embodiment, a fourth cover is provided to protect the two second surfaces 52 opposite to the electrode assembly 400, so as to cooperate with the second cover 70 to better protect the electrode assembly 400; at the same time, the area of ​​the second surface 52 is made smaller than the area of ​​the first surface 51, that is, the first cover 60 is provided on the surface with a larger area of ​​the electrode assembly 400, so as to reduce the difficulty of fixing the first cover 60, and also facilitate the identification device to identify the information recorded on the first cover 60.

[0249] 9 , in some embodiments, before step S902 , the electrode assembly gluing method further includes:

[0250] S907: performing a cold pressing process on the electrode assembly 400.

[0251] Cold pressing refers to a process for compressing the electrode assembly 400. The electrode assembly 400 can be cold pressed by passing it through two opposing pressing rollers, or it can be cold pressed by other means. The main function of cold pressing is to increase the compaction density of the positive and negative electrode materials, thereby increasing the discharge capacity of the battery cell 300, reducing internal resistance, reducing polarization loss, and extending the cycle life of the battery 200.

[0252] At the same time, the electrode assembly 400 that is compacted after the cold pressing process can also facilitate better fixing of the second cover 70 to the electrode assembly 400 .

[0253] In this embodiment, the electrode assembly 400 after the first cover 60 is fixed is subjected to a cold pressing process to reduce the gap inside the electrode assembly 400 , so as to facilitate the subsequent fixing of the second cover 70 to the electrode assembly 400 .

[0254] 9 , in some embodiments, before step S902 , the electrode assembly gluing method further includes:

[0255] S908: Perform a voltage withstand test on the electrode assembly 400.

[0256] The withstand voltage test refers to a test used to detect the internal circuit condition of the electrode assembly 400. For example, the withstand voltage test can detect a short circuit condition of the electrode assembly 400.

[0257] After the electrode assembly 400 is wound or stacked, it is usually necessary to perform shaping, cold pressing and other treatments on the electrode assembly 400. Foreign matter may enter the electrode assembly 400 in each process. Therefore, after the shaping, cold pressing and other treatments, performing a voltage test on the electrode assembly 400 can detect the circuit status inside the electrode assembly 400 and the yield of the electrode assembly 400. If the electrode assembly 400 is unqualified, it can be removed in time or further processed, thereby reducing the impact on subsequent processes and improving production efficiency.

[0258] The voltage resistance test can determine whether there are foreign particles inside the electrode assembly 400 that cause a short circuit, and can also determine the distance between the positive and negative electrodes. Specifically, a certain voltage can be applied between the positive and negative electrodes of the electrode assembly 400, and the resistance between the positive and negative electrodes can be obtained through the leakage current between the positive and negative electrodes. The size of the resistance can be used to determine whether the electrode assembly 400 is short-circuited.

[0259] In this embodiment, the electrode assembly 400 is subjected to a withstand voltage test after the first cover 60 is fixed to determine the yield of the electrode assembly 400, so as to facilitate timely processing of defective electrode assemblies 400, thereby achieving the effect of improving processing efficiency.

[0260] In a third aspect, some embodiments of the present application also provide a battery cell 300, including an electrode assembly 400 formed by the battery 200 assembly gluing method provided in some embodiments of the first aspect, or including the electrode assembly 400 provided in some embodiments of the second aspect.

[0261] 3 , a battery cell 300 includes an end cap 42 , a housing 41 , an electrode assembly 400 , and other functional components.

[0262] The end cap 42 is a component that fits over the opening of the housing 41 to isolate the internal environment of the battery cell 300 from the external environment. The housing 41 is used in conjunction with the end cap 42 to form an internal environment within the battery cell 300. This internal environment can accommodate the electrode assembly 400, electrolyte, and other components. A battery cell 300 may have one, two, or more electrode assemblies 400.

[0263] In a fourth aspect, some embodiments of the present application further provide a battery 200, including an electrode assembly 400 formed by the battery 200 assembly gluing method provided by some embodiments of the first aspect, or including the electrode assembly 400 provided by some embodiments of the second aspect; or including the battery cell 300 provided by some embodiments of the third aspect.

[0264] 2 , the battery 200 includes a housing 30 and battery cells 300, wherein the battery cells 300 are accommodated in the housing 30. The housing 30 is used to provide a space for accommodating the battery cells 300, and the housing 30 can adopt various structures, for example, the housing 30 can be cylindrical, rectangular, or other shapes.

[0265] In the battery 200 , the battery cell 300 may be a square-shell battery cell 300 or a cylindrical battery cell 300 ; there may be multiple battery cells 300 , and the multiple battery cells 300 may be connected in series, in parallel, or in mixed connection.

[0266] In the fifth aspect, some embodiments of the present application also provide an electrical device 100, including an electrode assembly 400 formed by the gluing method of the battery 200 assembly provided by some embodiments of the first aspect, or including the electrode assembly 400 provided by some embodiments of the second aspect; or including the battery cell 300 provided by some embodiments of the third aspect, or the battery 200 provided by some embodiments of the fourth aspect.

[0267] The electric device 100 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.

[0268] 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. An electrode assembly, characterized in that: include: A first covering member is disposed on the surface of the electrode assembly, and an information pattern is disposed on the first covering member; The second covering member is disposed on the surface of the electrode assembly, and the information pattern is exposed outside the second covering member.

2. The electrode assembly according to claim 1, characterized in that: The second covering member is spaced apart from the first covering member.

3. The electrode assembly according to claim 2, characterized in that: The second covering member is provided with an avoidance hole, and the first covering member is accommodated in the avoidance hole.

4. The electrode assembly according to claim 3, characterized in that: The avoidance hole comprises at least two avoidance side walls, and two adjacent avoidance side walls are connected via rounded corners.

5. The electrode assembly according to claim 3 or 4, characterized in that: The distance between the side wall of the first covering member and the adjacent side wall of the avoiding position is greater than zero.

6. The electrode assembly according to claim 5, characterized in that: The distance between the side wall of the first covering member and the adjacent side wall of the avoiding position is less than or equal to 1 mm.

7. The electrode assembly according to any one of claims 1 to 6, characterized in that: The electrode assembly comprises two first surfaces arranged opposite to each other, and the first covering member and the second covering member are arranged on the same first surface; Or the surface includes a first surface surrounding the electrode assembly.

8. The electrode assembly according to claim 7, characterized in that: A distance between any edge of the projection of the second covering member on the first surface and an adjacent edge of the first surface is greater than zero.

9. The electrode assembly according to claim 8, characterized in that: A distance between an edge of a projection of the second covering member on the first surface and an adjacent edge of the first surface is less than or equal to 3 mm.

10. A method for gluing an electrode assembly, characterized in that: include: A first covering member is arranged on the surface of the electrode assembly, wherein the first covering member is provided with an information pattern; A second covering member is arranged on the surface, and the information pattern is exposed outside the second covering member.

11. The method for gluing an electrode assembly according to claim 10, characterized in that: In the step of arranging a second covering member on the surface, the second covering member is arranged to be spaced apart from the first covering member.

12. The method for gluing an electrode assembly according to claim 10 or 11, characterized in that: Before the step of providing the second covering member on the surface, the electrode assembly gluing method further includes: Providing the second covering member, and setting a position avoidance hole on the second covering member; In the step of arranging the second covering member on the surface, the first covering member is located in the avoiding hole.

13. The method for gluing an electrode assembly according to claim 12, characterized in that: The avoidance hole comprises at least two avoidance side walls, and two adjacent avoidance side walls are connected via rounded corners.

14. The method for gluing an electrode assembly according to claim 13, characterized in that: The distance between the side wall of the first covering member and the adjacent side wall of the avoiding position is greater than zero.

15. The method for gluing an electrode assembly according to claim 13 or 14, characterized in that: The distance between the side wall of the first covering member and the adjacent side wall of the avoiding position is less than or equal to 1 mm.

16. The electrode assembly gluing method according to any one of claims 10 to 15, characterized in that: The surface includes two first surfaces arranged opposite to each other, and the first covering member and the second covering member are arranged on the same first surface; Or the surface includes a first surface surrounding the electrode assembly.

17. The method for gluing an electrode assembly according to claim 16, characterized in that: In the step of disposing a second covering member on the surface, a projection area of ​​the second covering member on the first surface is smaller than an area of ​​the first surface.

18. The method for gluing an electrode assembly according to claim 17, characterized in that: A distance between any edge of the projection of the second covering member on the first surface and an adjacent edge of the first surface is greater than zero.

19. The method for gluing an electrode assembly according to claim 17 or 18, characterized in that: A distance between an edge of a projection of the second covering member on the first surface and an adjacent edge of the first surface is less than or equal to 3 mm.

20. The method for gluing an electrode assembly according to any one of claims 10 to 19, characterized in that: The surface includes two first surfaces disposed opposite to each other, and the first covering member is disposed on any one of the two first surfaces; The electrode assembly gluing method further comprises: The third cover is disposed on the first surface, wherein the third cover and the first cover are disposed on different surfaces. on the first surface.

21. The method for gluing an electrode assembly according to claim 20, characterized in that: A distance between any edge of the projection of the third covering member on the first surface and an adjacent edge of the first surface is greater than zero.

22. The method for gluing an electrode assembly according to claim 20 or 21, characterized in that: A distance between an edge of a projection of the third covering member on the first surface and an adjacent edge of the first surface is less than or equal to 3 mm.

23. The method for gluing an electrode assembly according to any one of claims 20 to 22, characterized in that: Before the step of providing the first covering member on the surface of the electrode assembly, the electrode assembly gluing method further includes: The electrode assembly is pre-pressed and shaped.

24. The method for gluing an electrode assembly according to any one of claims 20 to 23, characterized in that: The electrode assembly gluing method further comprises: A fourth covering member is disposed on two opposite second surfaces of the electrode assembly, wherein the area of ​​the second surface is smaller than the area of ​​the first surface, and the second surface is adjacent to the first surface.

25. A battery cell, characterized in that: It comprises the electrode assembly as described in any one of claims 1-9; or the electrode assembly formed by the electrode assembly gluing method as described in any one of claims 10-24.

26. A battery, characterized in that: Comprising the battery cell as claimed in claim 25.

27. An electrical device, characterized in that: Comprising a battery as claimed in claim 26.

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