Electrode assembly and rubberizing method thereof, battery monomer, battery and electric device

Abstract

The invention is suitable for the technical field of power batteries, and provides an electrode assembly and a rubberizing method thereof, a battery monomer, a battery and a power utilization device. The first covering part is arranged on the surface of the electrode assembly, and an information pattern is arranged on the first covering part; the second covering part is arranged on the surface of the electrode assembly, and the information pattern is exposed out of the second covering part; the second covering part covers the surface of the electrode assembly, so that the electrode assembly is protected through the second covering part, and the influence of the external environment on the electrode assembly is reduced; when the second covering part covers the electrode assembly, the information pattern can be exposed out of the second covering part, so that the influence of the second covering part on the first covering part is reduced, and the identification equipment can conveniently identify information recorded on the first covering part.

Description

Technical Field

[0001] 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

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

[0003] 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 electrodes or diaphragms of the battery cells during production and transportation, and the QR code tape records the product information. During the production process of battery cells, it is easy for the QR code tape to be difficult to identify. Summary of the invention

[0004] In view of the above problems, the present application provides an electrode assembly and a gluing method thereof, 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.

[0005] In a first aspect, some embodiments of the present application provide an electrode assembly, including:

[0006] Electrode assembly;

[0007] A first covering member is disposed on the surface of the electrode assembly, and an information pattern is disposed on the first covering member;

[0008] The second covering member is arranged on the surface of the electrode assembly, and the information pattern is exposed outside the second covering member.

[0009] 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.

[0010] In some embodiments, the second covering member is spaced apart from the first covering member.

[0011] In the technical solution of this embodiment, the second cover is spaced apart from the first cover to reduce the influence of the second cover on the first cover, so that the first cover can be better exposed to the outside world, so that the identification device can identify the information recorded on the first cover.

[0012] In some embodiments, the second covering member is provided with an avoidance hole, and the first covering member is accommodated in the avoidance hole.

[0013] 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 and reduce the area of ​​the first surface exposed to the outside, thereby improving the protective effect of the second covering member on the electrode assembly.

[0014] In some embodiments, the avoidance hole includes at least two avoidance side walls, and two adjacent avoidance side walls are connected by rounded corners.

[0015] In the technical solution of this embodiment, 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 member 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 possibility of the second covering member being torn during the tensioning process.

[0016] In some embodiments, a distance between a side wall of the first cover and an adjacent side wall of the avoidance member is greater than zero.

[0017] 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, thereby providing an error space for the process in which the second cover is arranged on the first surface during the processing step.

[0018] 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.

[0019] 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 also 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.

[0020] 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;

[0021] Or surface includes a first surface surrounding the electrode assembly.

[0022] 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, thereby increasing the compatibility of the electrode assembly gluing method.

[0023] In some embodiments, a distance between any edge of a projection of the second cover on the first surface and an adjacent edge of the first surface is greater than zero.

[0024] 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 easy to extend beyond the first surface, thereby reducing the occurrence of debris adhering to the second cover.

[0025] 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.

[0026] The technical solution of this embodiment provides some spacing ranges 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.

[0027] In a second aspect, some embodiments of the present application further provide a method for gluing an electrode assembly, comprising:

[0028] A first covering member is arranged on the surface of the electrode assembly, and an information pattern is arranged on the first covering member;

[0029] A second cover is arranged on the surface, and the information pattern is exposed outside the second cover.

[0030] In the technical solution of this embodiment, an information pattern is provided on the first cover so that the identification device can recognize the information recorded in the information pattern, and the first cover is first provided on the surface of the electrode assembly to meet the requirements of the processing procedure; 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 devices of subsequent processes can recognize the information recorded on the first cover.

[0031] In some embodiments, in the step of disposing a second covering member on the surface, the second covering member is disposed spaced apart from the first covering member.

[0032] In the technical solution of this embodiment, the second cover is spaced apart from the first cover to reduce the influence of the second cover on the first cover, so that the first cover can be better exposed to the outside world, so that the identification device can identify the information recorded on the first cover.

[0033] In some embodiments, before the step of providing the second cover on the surface, the electrode assembly gluing method further includes:

[0034] Providing a second cover member, and setting a position avoidance hole on the second cover member;

[0035] In the step of arranging the second covering member on the surface, the first covering member is located in the avoiding hole.

[0036] 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 and reduce the area of ​​the first surface exposed to the outside, thereby improving the protective effect of the second covering member on the electrode assembly.

[0037] In some embodiments, the avoidance hole includes at least two avoidance side walls, and two adjacent avoidance side walls are connected by rounded corners.

[0038] In the technical solution of this embodiment, 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 member 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 possibility of the second covering member being torn during the tensioning process.

[0039] In some embodiments, a distance between a side wall of the first cover and an adjacent side wall of the avoidance member is greater than zero.

[0040] 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, thereby providing an error space for the process in which the second cover is arranged on the first surface during the processing process.

[0041] 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.

[0042] 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 also 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.

[0043] 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;

[0044] Or surface includes a first surface surrounding the electrode assembly.

[0045] 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.

[0046] In some embodiments, in the step of disposing the 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.

[0047] In the technical solution of this embodiment, the projection area between the second cover and the first surface is made smaller than the projection area of ​​the first surface, even if the second cover cannot completely cover the first surface, so as to reduce the situation where the second cover extends to 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 arrangement can reduce the situation where the second cover adheres to foreign matter.

[0048] In some embodiments, a distance between any edge of the projection of the second cover on the first surface and an adjacent edge of the first surface is greater than zero.

[0049] 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 easy to extend beyond the first surface, thereby reducing the occurrence of debris adhering to the second cover.

[0050] 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.

[0051] The technical solution of this embodiment provides some spacing ranges 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.

[0052] 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;

[0053] The electrode assembly gluing method also includes:

[0054] The third cover is disposed on the first surface, wherein the third cover and the first cover are respectively disposed on different first surfaces.

[0055] 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, and at this time, the third cover does not have the problem of avoiding position and covering information.

[0056] In some embodiments, a distance between any edge of a projection of the third cover on the first surface and an adjacent edge of the first surface is greater than zero.

[0057] Similar to the second cover, the third cover is also prone to sticking debris when it extends beyond the first surface. Accordingly, in the technical solution of this embodiment, the distance between the edge of the projection of the third 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 third cover and the edge of the adjacent first surface, so that any side of the third cover is not likely to extend beyond the first surface, thereby reducing the occurrence of debris sticking to the third cover.

[0058] 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.

[0059] The technical solution of this embodiment provides some spacing ranges between the projected edge of the third covering member on the first surface and the adjacent edge of the first surface, so that the third covering member is not easily extended beyond the first surface. At the same time, it can also enable the third covering member to cover more area of ​​the first surface to better protect the electrode assembly.

[0060] In some embodiments, before the step of providing the first covering member on the surface of the electrode assembly, the electrode assembly gluing method further includes:

[0061] The electrode assembly is pre-pressed and shaped.

[0062] 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.

[0063] In some embodiments, the electrode assembly gluing method further comprises:

[0064] 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 the area of ​​the first surface, and the second surface is adjacent to the first surface.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In a fifth aspect, some embodiments of the present application further provide an electrical device, comprising a battery provided by some embodiments of the fourth aspect.

[0069] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0071] Figure 1 A schematic diagram of the structure of an electrical device provided in some embodiments of the present application.

[0072] Figure 2 Schematic diagram of the exploded structure of a battery provided in some embodiments of the present application.

[0073] Figure 3 Schematic diagram of the explosion structure of a battery cell provided in some embodiments of the present application.

[0074] Figure 4 A front view schematic diagram of an electrode assembly provided in some embodiments of the present application.

[0075] Figure 5 A schematic rear view of an electrode assembly provided in some embodiments of the present application.

[0076] Figure 6 A schematic flow chart of a method for gluing an electrode assembly provided in some embodiments of the present application.

[0077] Figure 7 A schematic flow chart of a method for gluing an electrode assembly provided in some other embodiments of the present application.

[0078] Figure 8 A schematic flow chart of a method for gluing an electrode assembly provided in some further embodiments of the present application.

[0079] Fig. 9 A schematic flow chart of a method for gluing an electrode assembly provided in some other embodiments of the present application.

[0080] The meanings of the marks in the figure are:

[0081] 100. Electrical devices;

[0082] 10. Motor;

[0083] 20. Controller;

[0084] 200. Battery;

[0085] 30. Box body; 31. First part; 32. Second part;

[0086] 300, battery cell;

[0087] 41. housing; 42. end cover;

[0088] 400. Electrode assembly;

[0089] 51. first surface; 52. second surface;

[0090] 60. A first covering member;

[0091] 70, second cover; 71, avoidance hole; 711, avoidance side wall; 712, rounded corner;

[0092] 80. The third covering member. DETAILED DESCRIPTION

[0093] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0095] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0096] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0097] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0098] 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).

[0099] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0100] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0101] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0102] During the production process of battery cells, it is usually necessary to stick small tape with product information (such as QR code tape, barcode 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 tape on the battery cells to reduce damage to the battery cell's electrodes or diaphragms during production and transportation.

[0103] According to the processing procedures of battery cells, after the electrode assembly is formed, it is necessary to stick a small tape first, so that the relevant equipment in the subsequent cold pressing, testing and other processes can obtain product information. The sticking of protective tape usually needs to be done after the cold pressing and other processes, because after the electrode assembly is formed, there are usually gaps inside it, which makes the overall structure loose. If the protective tape is directly pasted, it is easy to cause wrinkles in the tape, which will also have a negative impact on the shaping, cold pressing and other processes, and easily cause the electrode assembly as a whole to have wrinkles and other undesirable conditions.

[0104] 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.

[0105] Based on this, according to the process requirements, the small tape will be pasted on the electrode assembly before the protective tape, which will result in the protective tape covering the small tape after the protective tape is pasted, and will have a negative impact on the subsequent processing equipment's recognition of product information.

[0106] In order to facilitate subsequent equipment to identify the product information recorded on the small tape after the protective tape is pasted, the small tape can be pasted after the protective tape is pasted. However, this will result in the equipment in the various processes (cold pressing, testing, etc.) after the electrode assembly is formed and between the protective tape being pasted being pasted, unable to directly identify the product information through the small tape, and can only obtain product information through other means, which can easily lead to problems such as cumbersome operation process and reduced production efficiency.

[0107] Based on the above considerations, in order to solve the problem that the identification device is difficult to identify 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.

[0108] 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, thereby facilitating the identification equipment in subsequent processes to obtain product information.

[0109] The electrode assembly gluing method disclosed in the embodiment 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.

[0110] For the convenience of description, the following embodiments are described by taking an electric device 100 of an embodiment of the present application as a vehicle as an example.

[0111] refer to Figure 1 , Figure 1 A schematic diagram of the structure when the power-consuming device 100 provided for some embodiments of the present application is a vehicle. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 200 is provided inside the vehicle, and the battery 200 may be provided at the bottom, head or tail of the vehicle. The battery 200 may be used to power the vehicle, for example, the battery 200 may 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 driving the vehicle.

[0112] In some embodiments of the present application, the battery 200 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0113] refer to Figure 2 , Figure 2Schematic diagram of the exploded structure of the battery 200 provided in some embodiments of the present application. The battery 200 includes a box 30 and a battery cell 300, and the battery cell 300 is accommodated in the box 30. Among them, the box 30 is used to provide a storage space for the battery cell 300, and the box 30 can adopt a variety of structures. In some embodiments, the box 30 may include a first part 31 and a second part 32, the first part 31 and the second part 32 cover each other, and the first part 31 and the second part 32 jointly define a storage space for accommodating the battery cell 300. The second part 32 may be a hollow structure with one end open, the first part 31 may be a plate-like structure, and the first part 31 covers the open side of the second part 32, so that the first part 31 and the second part 32 jointly define a storage space; the first part 31 and the second part 32 may also be hollow structures with one side open, and the open side of the first part 31 covers the open side of the second part 32. Of course, the box 30 formed by the first part 31 and the second part 32 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0114] 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 mixed connection. A mixed connection means that the multiple battery cells 300 are both connected in series and in parallel. The multiple battery cells 300 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 300 is accommodated in the box 30; of course, the battery 200 may also be a battery module formed by connecting multiple battery cells 300 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 30. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar component for realizing electrical connection between the multiple battery cells 300.

[0115] Each battery cell 300 may be a secondary battery or a primary battery, or 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.

[0116] refer to Figure 3 , Figure 3 The exploded structure diagram of the battery cell 300 provided in some embodiments of the present application. The battery cell 300 refers to the smallest unit constituting the battery 200. As shown in the figure, the battery cell 300 includes an end cap 42, a housing 41, an electrode assembly 400 and other functional components.

[0117] The end cap 42 refers to a component that covers the opening of the shell 41 to isolate the internal environment of the battery cell 300 from the external environment. Without limitation, the shape of the end cap 42 can be adapted to the shape of the shell 41 to match the shell 41. Optionally, the end cap 42 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 42 is not easily deformed when squeezed and collided, so that the battery cell 300 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 42. The electrode terminal can be used to electrically connect to the electrode assembly 400 for outputting or inputting electrical energy of the battery cell 300. In some embodiments, the end cap 42 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. The material of the end cap 42 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 42, and the insulating member may be used 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 plastic, rubber, or the like.

[0118] The shell 41 is a component used to cooperate with the end cap 42 to form the internal environment of the battery cell 300, wherein the formed internal environment can be used to accommodate the electrode assembly 400, the electrolyte and other components. The shell 41 and the end cap 42 can be independent components, and an opening can be set on the shell 41, and the internal environment of the battery cell 300 is formed by covering the opening with the end cap 42 at the opening. Without limitation, the end cap 42 and the shell 41 can also be integrated. Specifically, the end cap 42 and the shell 41 can form a common connection surface before other components are put into the shell, and when the interior of the shell 41 needs to be encapsulated, the end cap 42 covers the shell 41. The shell 41 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 41 can be determined according to the specific shape and size of the electrode assembly 400. The material of the shell 41 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0119] The electrode assembly 400 is a component in the battery cell 300 where an electrochemical reaction occurs. One or more electrode assemblies 400 may be included 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 of 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.

[0120] In a first aspect, some embodiments of the present application provide an electrode assembly 400, referring to Figure 4 , Figure 5 ,in, Figure 4 This is a front view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application. Figure 5 A schematic rear view of an electrode assembly 400 provided in some embodiments of the present application.

[0121] 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 disposed on the surface of the electrode assembly 400, and an information pattern is disposed on the first covering member 60; the second covering member 70 is disposed on the surface of the electrode assembly 400, and the information pattern can be exposed outside the second covering member 70.

[0122] The electrode assembly 400 refers to a structure composed of a diaphragm and an electrode plate; the first cover 60 refers to a structure capable of covering a portion of the surface of the electrode assembly 400, and an information pattern is provided on the first cover 60 to carry product information; the second cover 70 refers to a structure capable of covering the surface of the electrode assembly 400.

[0123] The information pattern exposed outside the second cover 70 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.

[0124] 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 influence of the external environment on the electrode assembly 400 is reduced, so as to protect 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 as to facilitate the identification device to identify the information recorded on the first covering member 60.

[0125] refer to Figure 4 In some embodiments, the second covering member 70 is spaced apart from the first covering member 60 .

[0126] 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.

[0127] 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, so that the identification device can recognize the information recorded on the first cover 60 .

[0128] refer to Figure 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 .

[0129] 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 .

[0130] 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 surface area of ​​the electrode assembly 400, reducing the surface area 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.

[0131] refer to Figure 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 via a rounded corner 712 .

[0132] 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; 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 two adjacent avoidance side walls 711 being directly connected and forming an edge, the setting of the rounded corner 712 can reduce stress concentration.

[0133] 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, in this embodiment, two adjacent avoidance side walls 711 of the avoidance hole 71 are connected by 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 possibility of the second covering member 70 being torn during the tensioning process.

[0134] refer to Figure 4 In some embodiments, the distance between the side wall of the first cover member 60 and the adjacent avoidance side wall 711 is greater than zero.

[0135] The side wall of the first cover 60 refers 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 wall of the first cover 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 cover 60; the distance between the side wall of the first cover 60 and the avoidance side wall 711 can reduce the requirements of the process on the equipment accuracy, thereby reducing the processing difficulty and improving the product yield.

[0136] In the present embodiment, the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is made greater than zero, so that the first cover 60 can be accommodated in the avoidance hole 71, thereby 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. At the same time, it can reduce the occurrence of the first cover 60 being blocked by the second cover 70, thereby providing an error space for the process in which the second cover 70 is arranged on the surface of the electrode assembly 400 during the processing process.

[0137] refer to Figure 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.

[0138] 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.

[0139] 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, which can easily adapt to the equipment accuracy in step S902 and enable the second cover 70 to have a better protective effect on the electrode assembly 400.

[0140] The present 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 accommodating the first cover 60 in the avoidance hole 71 when the second cover 70 is disposed on the surface of the electrode assembly 400, thereby reducing the occurrence of the first cover 60 being blocked by the second cover 70, and at the same time, it can also 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.

[0141] refer to Figure 4 In some embodiments, the surface of the electrode assembly 400 includes two oppositely disposed first surfaces 51, and the first covering member 60 and the second covering member 70 are disposed on the same first surface 51; or the surface of the electrode assembly 400 includes a first surface 51 that surrounds the electrode assembly 400.

[0142] When the surface of the electrode assembly 400 includes two first surfaces 51 disposed opposite to each other, that is, the electrode assembly 400 has a plurality of 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, that is, there are other surfaces on the side of the electrode assembly 400 that are not covered by the second cover 70.

[0143] When the surface of the electrode assembly 400 includes a first surface 51 surrounding 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.

[0144] 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. The second covering member 70 can 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 types of electrode assemblies 400, thereby increasing the compatibility of the electrode assembly gluing method.

[0145] refer to Figure 4In some embodiments, the distance between any edge of the projection of the second cover 70 on the first surface 51 and the adjacent edge of the first surface 51 is greater than zero.

[0146] 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.

[0147] Since the second cover 70 extends beyond the first surface 51, dust, metal debris or other foreign impurities are easily adhered, and the foreign impurities adhered to the second cover 70 may have a negative impact on the electrode assembly 400. Accordingly, 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 easy to extend beyond the first surface 51, thereby reducing the occurrence of foreign matter adhering to the second cover 70.

[0148] refer to Figure 4 In some embodiments, the spacing 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 spacing may be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or other values.

[0149] 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 protective 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 protective effect of the second covering member 70 on the electrode assembly 400.

[0150] The distance between any edge of the projection of the second cover 70 on the first surface 51 and the adjacent edge of the first surface 51 is less than or equal to 3 mm, which can not only 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.

[0151] This embodiment provides some spacing ranges 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.

[0152] In a second aspect, some embodiments of the present application also provide a method for gluing an electrode assembly, referring to Figures 4 to 6 ,in, Figure 4 This is a front view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application. Figure 5 A rear view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application, Figure 6 A schematic flow chart of a method for gluing an electrode assembly provided in some embodiments of the present application.

[0153] In some embodiments of the present application, the electrode assembly gluing method includes:

[0154] S901 : a first cover 60 is disposed on the surface of the electrode assembly 400 , and an information pattern is disposed on the first cover 60 .

[0155] 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 for electrochemical reaction. The electrode assembly 400 can make the diaphragm, the positive pole piece and the negative pole piece be formed by a stacking process, or can make the diaphragm, the positive pole piece and the negative pole piece be formed by 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.

[0156] The first cover 60 refers to a structure that can cover part of the surface of the electrode assembly 400; an information pattern is provided on the first cover 60 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, and can also be provided on the surface of the electrode assembly 400 by other methods.

[0157] 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 .

[0158] S902 : placing a second cover 70 on the surface, with the information pattern exposed outside the second cover 70 .

[0159] 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 corresponding surface of the 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, and can also be set on the surface of the electrode assembly 400 by other methods.

[0160] The second cover 70 may cover only part of the surface of the electrode assembly 400 , or may cover 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 .

[0161] The information pattern exposed outside the second cover 70 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.

[0162] 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 covers the edge of the first cover 60 to reveal the information pattern to the outside; 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.

[0163] 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 influence 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.

[0164] In some embodiments, in the step of disposing the second cover 70 on the surface, that is, in the step S902 , the second cover 70 is disposed spaced apart from the first cover 60 .

[0165] 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.

[0166] Under the premise that the second cover 70 is spaced apart from the first cover 60, the second cover 70 should cover a larger area of ​​the first surface 51 as much as possible to protect a larger area of ​​the electrode assembly 400. Accordingly, the spaced apart arrangement of the second cover 70 and the first cover 60 can be achieved in a variety of ways. In some embodiments, the first cover 60 can be arranged at the edge of the first surface 51, and 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, and 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 and do not cover 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 by other methods, 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.

[0167] 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, so that the identification device can recognize the information recorded on the first cover 60 .

[0168] According to some embodiments of the present application, reference Figure 4 , Figure 5 , Figure 7 ,in, Figure 4 This is a front view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application. Figure 5 A rear view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application, Figure 7 A schematic flow chart of the step of setting the avoidance hole 71 in the method for gluing an electrode assembly provided in some embodiments of the present application.

[0169] 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:

[0170] S903 : providing a second cover member 70 , and setting a position avoidance hole 71 on the second cover member 70 .

[0171] 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, and 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.

[0172] 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 .

[0173] In step S902, the first covering member 60 is located in the avoiding hole 71, that is, when the second covering member 70 is arranged on the surface of the electrode assembly 400, the avoiding 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 avoiding hole 71.

[0174] 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 surface area of ​​the electrode assembly 400, reducing the surface area 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.

[0175] refer to Figure 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 via a rounded corner 712 .

[0176] 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 enclose the avoidance hole 71 .

[0177] According to the shape of the avoidance hole 71, there are at least two avoidance side walls 711. For example, when the avoidance hole 71 is a square, there are four avoidance side walls 711; for another example, when the avoidance hole 71 is a triangle, there are three avoidance side walls 711; for another example, when the avoidance hole 71 is an ellipse, there are two avoidance side walls 711.

[0178] Two adjacent avoidance side walls 711 are connected via 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 provision of rounded corners 712 can reduce stress concentration.

[0179] After the second cover 70 is disposed 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.

[0180] 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, in this embodiment, two adjacent avoidance side walls 711 of the avoidance hole 71 are connected by 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 possibility of the second covering member 70 being torn during the tensioning process.

[0181] refer to Figure 4 In some embodiments, the distance between the side wall of the first cover member 60 and the adjacent avoidance side wall 711 is greater than zero.

[0182] 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 avoiding hole 71, the distance between the side wall of the first covering member 60 and the avoiding side wall 711 is greater than zero, that is, the area of ​​the avoiding hole 71 is greater than the area of ​​the first covering member 60.

[0183] Because the avoidance hole 71 needs to be opposite to the first cover 60 when the second cover 70 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 requirement of the process on the equipment precision, thereby reducing the processing difficulty and improving the product yield.

[0184] In the present embodiment, the distance between the side wall of the first cover 60 and the adjacent avoidance side wall 711 is made greater than zero, so that the first cover 60 can be accommodated in the avoidance hole 71, thereby 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. At the same time, it can reduce the occurrence of the first cover 60 being blocked by the second cover 70, thereby providing an error space for the process in which the second cover 70 is arranged on the surface of the electrode assembly 400 during the processing process.

[0185] refer to Figure 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.

[0186] 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, the 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 precision of the processing equipment, the distance of 0 can easily cause the second cover 70 to partially block the first cover 60, thereby causing a negative impact on the identification device's recognition of the product information recorded on the first cover 60.

[0187] The larger the distance between the side wall of the first covering member 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 covering member 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 covering member 70 on the electrode assembly 400.

[0188] 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, which can easily adapt to the equipment accuracy in step S902 and enable the second cover 70 to have a better protective effect on the electrode assembly 400.

[0189] The present 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 accommodating the first cover 60 in the avoidance hole 71 when the second cover 70 is disposed on the surface of the electrode assembly 400, thereby reducing the occurrence of the first cover 60 being blocked by the second cover 70, and at the same time, it can also 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.

[0190] According to some embodiments of the present application, reference Figure 3 ,refer to Figure 4 , Figure 5 ,in, Figure 3 Schematic diagram of the exploded structure of a battery cell 400 provided in some embodiments of the present application, Figure 4 This is a front view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application. Figure 5 A schematic rear view of an electrode assembly 400 provided in some embodiments of the present application.

[0191] In some embodiments of the present application, the surface of the electrode assembly 400 includes two oppositely disposed first surfaces 51, and the first covering member 60 and the second covering member 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.

[0192] Similar to some embodiments of the first aspect, when the surface of the electrode assembly 400 includes two first surfaces 51 disposed opposite to each other, that is, the electrode assembly 400 has a plurality of 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, that is, there are other surfaces on the side of the electrode assembly 400 that are not covered by the second cover 70.

[0193] 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 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.

[0194] 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. The second covering member 70 can 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 types of electrode assemblies 400, thereby increasing the compatibility of the electrode assembly gluing method.

[0195] refer to Figure 4 , Figure 5 In some embodiments, in the step of setting the second covering member 70 on the surface, that is, in step S902 , the projection area of ​​the second covering member 70 on the first surface 51 is smaller than the area of ​​the first surface 51 .

[0196] The projection area of ​​the second cover 70 on the first surface 51 is the area that the second cover 70 can cover, so that the projection area of ​​the second cover 70 and the first surface 51 is smaller than the area of ​​the first surface 51, that is, the second cover 70 cannot completely cover the first surface 51, and the second cover 70 does not cover the edge of the first surface 51, so that the second cover 70 is not easy to extend beyond the first surface 51.

[0197] 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 projection 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.

[0198] 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.

[0199] Accordingly, in this embodiment, the projection area of ​​the second cover 70 on the first surface 51 is smaller than the projection area of ​​the first surface 51, even if the second cover 70 cannot completely cover the first surface 51, so as to reduce the situation where the second cover 70 extends 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 situation where the second cover 70 adheres to foreign matter.

[0200] refer to Figure 4 In some embodiments, the distance between any edge of the projection of the second cover 70 on the first surface 51 and the adjacent edge of the first surface 51 is greater than zero.

[0201] 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 completely fall on the first surface 51; when the second cover 70 is arranged on the first surface 51, any edge of the second cover 70 is not easy to extend beyond the first surface 51.

[0202] 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 easy to extend beyond the first surface 51, thereby reducing the occurrence of debris adhering to the second cover 70.

[0203] refer to Figure 4 In some embodiments, the spacing 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 spacing may be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or other values.

[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; because the second cover 70 is used to protect the first surface 51, the distance can theoretically be 0, but affected by the precision 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 impacts on the electrode assembly 400.

[0205] The larger the distance between any edge of the projection of the second covering member 70 on the first surface 51 and the adjacent edge of the 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 protective 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 S902, and the better the protective effect of the second covering member 70 on the electrode assembly 400.

[0206] The distance between any edge of the projection of the second cover 70 on the first surface 51 and the adjacent edge of the first surface 51 is less than or equal to 3 mm, which can not only 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.

[0207] This embodiment provides some spacing ranges 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.

[0208] According to some embodiments of the present application, reference Figure 4 , Figure 5 , Figure 8 ,in, Figure 4 This is a front view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application. Figure 5 A rear view schematic diagram of an electrode assembly 400 provided in some embodiments of the present application, Figure 8 Schematic diagram of a process of applying glue to an electrode assembly including a third cover 80 in some embodiments of the present application

[0209] 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 any one of the two first surfaces 51 ;

[0210] The electrode assembly gluing method also includes:

[0211] 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 .

[0212] The third cover 80 refers to a structure that can cover the first surface 51, and 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, and can also be set on the first surface 51 by other methods.

[0213] The third cover 80 may cover only a portion of the first surface 51 , or may cover 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 .

[0214] 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. Furthermore, 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.

[0215] 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 only one 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.

[0216] refer to Figure 5 In some embodiments, the distance between any edge of the projection of the third cover 80 on the first surface 51 and the adjacent edge of the first surface 51 is greater than zero.

[0217] 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 easy to extend beyond the first surface 51, that is, the projection of the third cover 80 on the first surface 51 can completely fall on the first surface 51; when the third cover 80 is arranged on the first surface 51, any edge of the third cover 80 is not easy to extend beyond the first surface 51.

[0218] 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.

[0219] 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.

[0220] Accordingly, similar to the second cover 70 in some embodiments, the present embodiment enables 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 to be greater than zero, so that 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.

[0221] refer to Figure 5 In some embodiments, the spacing 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 spacing may be 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm or other values.

[0222] The distance between any edge of the projection of the third covering member 80 on the first surface 51 and the edge of the adjacent first surface 51 is the distance shown by H2 in the figure; since the third covering member 80 is used to protect the first surface 51, the distance can theoretically be 0, but affected by the precision of the processing equipment, the distance of 0 can easily cause the third covering member 80 to extend beyond the first surface 51, thereby easily adhering to impurities and causing negative impacts on the electrode assembly 400.

[0223] The larger the distance between any edge of the projection of the third covering member 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 protective effect of the third covering member 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 protective effect of the third covering member 80 on the electrode assembly 400.

[0224] 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 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.

[0225] This embodiment provides some spacing ranges 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.

[0226] According to some embodiments of the present application, reference Fig. 9 , Fig. 9A schematic flow chart of a method for gluing an electrode assembly provided in some embodiments of the present application.

[0227] In some embodiments of the present application, before step S901, the electrode assembly gluing method further includes:

[0228] S906: Pre-pressing and shaping the electrode assembly 400.

[0229] When manufacturing the electrode assembly 400, the positive electrode sheet, the separator, the negative electrode sheet, and the separator are usually arranged in the order of stacking and forming the electrode assembly 400. If the internal gap of the electrode assembly 400 is large and the electrode assembly 400 is relatively fluffy as a whole, it is easy to cause the separator and the electrode sheet to be loosely bonded, and it is easy to cause the separator to wrinkle and the electrode assembly 400 to be loose, which in turn is easy to cause the resistance of the lithium ion embedding from the positive electrode to the negative electrode to increase, which is easy to cause lithium precipitation. After long-term circulation, lithium dendrites are formed to penetrate the glue-coated separator, causing internal short circuits in the electrode assembly 400 and leading to safety hazards.

[0230] 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 separator 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 separator and the electrode sheet bonded more tightly, and enable the electrode assembly 400 to form the desired shape.

[0231] At the same time, compared with the fluffy electrode assembly 400, the first cover 60 is more easily arranged on the electrode assembly 400 after pre-pressing and shaping, and placing step S906 before step S901 can also reduce the negative impact of the first cover 60 on pre-pressing and shaping.

[0232] 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 first covering member 60 to be adhered to the electrode assembly 400 .

[0233] refer to Fig. 9 In some embodiments, before S906, the electrode assembly gluing method further includes:

[0234] S905: providing a plurality of electrode sheets and diaphragms, and laminating the electrode sheets and diaphragms to obtain an electrode assembly 400.

[0235] The electrode sheets include a positive electrode sheet and a negative electrode sheet. The positive electrode sheet and the negative electrode sheet are stacked, and a separator is arranged between adjacent positive electrode sheets and negative electrode sheets. Then, the stacked positive electrode sheets, negative electrode sheets and separators are stacked to obtain the electrode assembly 400.

[0236] Lamination processing refers to a formation method of 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 are alternately stacked, and then a separator is set between adjacent positive electrode sheets 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.

[0237] 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.

[0238] refer to Fig. 9 In some embodiments, the electrode assembly gluing method further includes:

[0239] S909 : disposing 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 the area of ​​the first surface 51 , and the second surface 52 is adjacent to the first surface 51 .

[0240] 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.

[0241] The area of ​​the second surface 52 is smaller than that of the first surface 51, that is, the first surface 51 is the larger surface of the electrode assembly 400, and the first cover 60 is arranged on the larger surface of the electrode assembly 400 to facilitate identification equipment in each process or product information recorded on the first cover 60; at the same time, because the first cover 60 is usually facing upward to facilitate identification equipment to obtain information, the first cover 60 is arranged on the larger surface of the electrode assembly 400. It can also make the other first surface 51 opposite to the first cover 60 contact with the conveying device. Because the first surface 51 is larger in area, this arrangement can make the electrode assembly 400 more stable during the conveying process and less prone to displacement, tipping or flipping.

[0242] The fourth covering member refers to a structure capable of covering the second surface 52, and the fourth covering member is used to protect the corresponding second surface 52; the material of the fourth covering member may be paper, plastic or other materials; the shape of the fourth covering member may be round, square or other shapes; the fourth covering member may be pasted on the second surface 52, or may be provided on the second surface 52 by other methods.

[0243] The fourth cover may cover only a portion of the second surface 52 , or may cover 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 .

[0244] Step S909 is used to place the fourth cover on two opposite second surfaces 52. This step can be set before or after step S902. That is, the present application does not impose any particular limitation on the order of setting the second cover 70 and the fourth cover.

[0245] 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.

[0246] refer to Fig. 9 In some embodiments, before step S902, the electrode assembly gluing method further includes:

[0247] S907: performing cold pressing treatment on the electrode assembly 400.

[0248] 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 the internal resistance, reducing the polarization loss, and extending the cycle life of the battery 200.

[0249] 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 .

[0250] 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 .

[0251] refer to Fig. 9 In some embodiments, before step S902, the electrode assembly gluing method further includes:

[0252] S908: Perform a withstand voltage test on the electrode assembly 400.

[0253] The withstand voltage test refers to a test for detecting 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 .

[0254] 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, a voltage test is performed on the electrode assembly 400 to 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 from the material or further processed in time, thereby reducing the impact on subsequent processes and improving production efficiency.

[0255] 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 electrode sheet and the negative electrode sheet; specifically, a certain voltage can be added 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, and the size of the resistance can be used to determine whether the electrode assembly 400 is short-circuited.

[0256] 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.

[0257] In a third aspect, some embodiments of the present application also provide a battery cell 300, including an electrode assembly 400 formed by the gluing method of the battery 200 assembly provided in some embodiments of the first aspect, or including the electrode assembly 400 provided in some embodiments of the second aspect.

[0258] refer to Figure 3 The battery cell 300 includes an end cover 42, a shell 41, an electrode assembly 400 and other functional components.

[0259] 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 housing 41 is a component used to cooperate with the end cap 42 to form the internal environment of the battery cell 300, wherein the formed internal environment can be used to accommodate the electrode assembly 400, electrolyte and other components. In the battery cell 300, there can be one electrode assembly 400, or there can be two or more.

[0260] 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.

[0261] refer to Figure 2 The battery 200 includes a box body 30 and a battery cell 300, and the battery cell 300 is accommodated in the box body 30. The box body 30 is used to provide a storage space for the battery cell 300, and the box body 30 can adopt a variety of structures, for example, the box body 30 can be cylindrical, rectangular or other shapes.

[0262] 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 a plurality of battery cells 300 , and the plurality of battery cells 300 may be connected in series, in parallel, or in mixed connection.

[0263] 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.

[0264] 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 car, 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.

[0265] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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: Electrode assembly; 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 or 3, 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 12 or 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 electrode assembly gluing method according to any one of claims 12 to 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: A third cover is disposed on the first surface, wherein the third cover and the first cover are respectively disposed on different first surfaces.

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 includes the electrode assembly according to any one of claims 1-9; or the electrode assembly formed by the electrode assembly gluing method according to 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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