Battery cell, battery, electric apparatus, and battery processing device and method

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), an electric apparatus, and a battery processing device (2000) and method. The battery cell (10) comprises an electrode assembly (11). The electrode assembly (11) comprises a positive electrode sheet (111), a negative electrode sheet (112), and a separator (113). The positive electrode sheet (111), the negative electrode sheet (112) and the separator (113) are stacked or wound. Part of the separator (113) extends beyond the edges of the positive electrode sheet (111) and the edges of the negative electrode sheet (112) to form edge sealing portions (1131), and at least part of the edge sealing portions (1131) is fixedly connected. In this way, the separator (113) can stably and firmly wrap the positive electrode sheet (111) and the negative electrode sheet (112), thereby mitigating the problem of connection of the positive electrode sheet (111) and the negative electrode sheet (112) caused by folding of the separator (113), and thus improving the reliability of the battery cell (10).

Description

Battery cell, battery, power-consuming device, battery processing equipment and method

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed on January 2, 2024 with the State Intellectual Property Office of the People's Republic of China, with application number 202410010963.3 and application name "Battery Cell, Battery, Electrical Device, Battery Processing Equipment and Method", the entire contents of which are incorporated by reference into this application. Technical Field

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

[0004] In related art, a battery cell generally includes a housing and an electrode assembly at least partially disposed within the housing. The electrode assembly is primarily formed by stacking or winding a positive electrode sheet and a negative electrode sheet, with a separator disposed between the positive and negative electrode sheets.

[0005] In some cases, the diaphragm has the risk of folding, and when folding, the diaphragm will not be able to wrap the electrode sheet, resulting in the positive electrode sheet and the negative electrode sheet overlapping and causing the electrode assembly to self-discharge. Summary of the Invention

[0006] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery, an electrical device, a battery processing equipment and a method, which can improve the technical problem of the positive electrode and the negative electrode overlapping caused by the folding of the diaphragm.

[0007] The technical solution adopted in the embodiment of this application is:

[0008] In the first aspect, an embodiment of the present application provides a battery cell, including an electrode assembly, the electrode assembly including a positive electrode sheet, a negative electrode sheet and a separator, the positive electrode sheet, the negative electrode sheet and the separator are stacked or wound; part of the separator extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet to form a sealing edge, and at least part of the sealing edge is fixedly connected.

[0009] The battery cell provided in the embodiments of the present application is configured such that at least a portion of the diaphragm extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet to form an edge seal, and at least a portion of the edge seal is fixedly connected, so that at least a portion of the diaphragm is fixedly connected to the edge of the positive electrode sheet and the edge of the negative electrode sheet, thereby fixing the position of at least a portion of the diaphragm to a certain extent. In this way, the diaphragm can stably and securely wrap the positive electrode sheet and the negative electrode sheet to achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of the positive electrode sheet and the negative electrode sheet overlapping due to the folding of the diaphragm, and thus improving the reliability of the battery cell.

[0010] In some embodiments, the edge sealing portions outside the edge of the same end of the positive electrode sheet and the negative electrode sheet are fixedly connected.

[0011] In this way, the edge sealing portions at each end can wrap the positive electrode sheet and the negative electrode sheet at the corresponding ends, so that the diaphragm can stably achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of overlapping the positive electrode sheet and the negative electrode sheet at the corresponding ends.

[0012] In some embodiments, the edge sealing portions outside the edges of the same end of the positive electrode sheet and the negative electrode sheet are fixedly connected to form a fixed area, and the fixed areas are arranged at intervals or continuously.

[0013] Such an arrangement makes the fixing operation of the edge banding portion very flexible.

[0014] In addition, by spacing the fixed areas outside the edges of the same end of the positive electrode sheet and the negative electrode sheet, it is convenient for the electrolyte to infiltrate from the edge sealing portion to the middle position of the electrode assembly, thereby improving the infiltration efficiency of the electrode assembly.

[0015] In some embodiments, a positive electrode tab and a negative electrode tab are provided at intervals at one end of the electrode assembly along the first direction, or a positive electrode tab and a negative electrode tab are provided at opposite ends of the electrode assembly along the first direction; the positive electrode tab is connected to the positive electrode sheet, the negative electrode tab is connected to the negative electrode sheet, and a sealing edge portion is provided on the outside of at least one end of the positive electrode sheet and the negative electrode sheet along the first direction.

[0016] Such an arrangement allows the edge sealing portions outside at least one end of the positive electrode sheet and the negative electrode sheet along the first direction to be fixedly connected, so that the diaphragm can wrap the positive electrode sheet and the negative electrode sheet at at least one end of the electrode assembly along the first direction, thereby improving the problem of overlapping of the positive electrode sheet and the negative electrode sheet at at least one end in the first direction.

[0017] In some embodiments, edge sealing portions are provided outside opposite ends of the positive electrode sheet and the negative electrode sheet along the first direction, and the edge sealing portions outside each end of the positive electrode sheet and the negative electrode sheet along the first direction are fixedly connected.

[0018] In this way, the problem of overlapping the positive electrode sheet and the negative electrode sheet at the opposite ends in the first direction can be improved.

[0019] In some embodiments, the positive electrode tab and the negative electrode tab are spaced apart at one end of the electrode assembly along the first direction, and the positive electrode sheet and the negative electrode sheet have an edge sealing portion outside one end of the positive electrode tab and the negative electrode tab; the edge sealing portion outside one end of the positive electrode sheet and the negative electrode sheet have the positive electrode tab and the negative electrode tab is fixedly connected and fixed to the positive electrode tab and / or the negative electrode tab.

[0020] Such an arrangement can improve the problem of the positive electrode tab being overlapped with the negative electrode sheet after being bent; and / or can improve the problem of the negative electrode tab being overlapped with the positive electrode sheet after being bent.

[0021] In some embodiments, the positive electrode tab and the negative electrode tab are respectively provided at opposite ends of the electrode assembly along the first direction, and edge sealing portions are provided outside the opposite ends of the positive electrode sheet and the negative electrode sheet along the first direction;

[0022] The positive electrode sheet and the negative electrode sheet have an edge seal outside one end of the positive electrode tab that is fixedly connected and fixed to the positive electrode tab; and / or, the positive electrode sheet and the negative electrode sheet have an edge seal outside one end of the negative electrode tab that is fixedly connected and fixed to the negative electrode tab.

[0023] This arrangement, on the one hand, can alleviate the problem of self-discharge of the electrode assembly caused by the positive electrode tab overlapping the negative electrode tab; and / or can alleviate the problem of self-discharge of the electrode assembly caused by the negative electrode tab overlapping the positive electrode tab. On the other hand, it helps to increase the electrolyte infiltration speed and infiltration amount, thereby improving the electrolyte infiltration of the battery cell and the cycle performance of the battery cell.

[0024] In some embodiments, the positive electrode sheet, the negative electrode sheet and the separator are stacked along the second direction; at least one end of the positive electrode sheet and the negative electrode sheet along the third direction is provided with an edge sealing portion; wherein the first direction, the second direction and the third direction intersect each other in pairs.

[0025] Such an arrangement allows the edge sealing portions outside at least one end of the positive electrode sheet and the negative electrode sheet along the third direction to be fixedly connected, so that the diaphragm can wrap the positive electrode sheet and the negative electrode sheet at at least one end of the electrode assembly along the third direction, thereby improving the problem of overlapping of the positive electrode sheet and the negative electrode sheet at at least one end in the third direction.

[0026] In some embodiments, edge sealing portions are provided outside the opposite ends of the positive electrode sheet and the negative electrode sheet along the third direction, and the edge sealing portions outside each end of the positive electrode sheet and the negative electrode sheet along the third direction are fixedly connected.

[0027] In this way, the problem of overlapping the positive electrode sheet and the negative electrode sheet at the opposite ends in the third direction can be improved.

[0028] In some embodiments, the edge sealing portion is heat sealed;

[0029] Alternatively, the diaphragm is provided with an adhesive layer at the edge sealing portion, and the edge sealing portion is fixedly connected via the adhesive layer.

[0030] Such an arrangement provides more operating modes for fixing the edge sealing portion and higher flexibility.

[0031] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0032] The battery provided in the embodiment of the present application, by adopting the battery cells involved above, can improve the problem of overlap of the positive and negative pole pieces caused by folding of the diaphragm, thereby improving the reliability of the battery cells and further improving the reliability of the battery.

[0033] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0034] The electrical device provided in the embodiment of the present application can improve the reliability of the battery cell by adopting the battery cell or battery involved above, thereby improving the reliability of the battery and further improving the reliability of the electrical device.

[0035] In a fourth aspect, an embodiment of the present application provides a battery processing device, which is applied to a battery cell; comprising:

[0036] The edge sealing device is used to fix and connect at least part of the edge sealing portion of the diaphragm that extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet.

[0037] The battery processing equipment provided in the embodiments of the present application, by providing an edge sealing device, can fix at least a portion of the edge sealing portion of the diaphragm that extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet, so that at least a portion of the diaphragm is fixedly connected to the edge of the positive electrode sheet and the edge of the negative electrode sheet, thereby making the position of at least a portion of the diaphragm fixed to a certain extent. In this way, the diaphragm can stably and securely wrap the positive electrode sheet and the negative electrode sheet to isolate the positive electrode sheet and achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of the positive electrode sheet and the negative electrode sheet overlapping due to the folding of the diaphragm, and thus improving the reliability of the battery cell.

[0038] In some embodiments, the edge sealing device includes:

[0039] Connectors;

[0040] The heating element is arranged on the connecting element and is used to heat the edge sealing portion to fix the edge sealing portion.

[0041] With such an arrangement, the edge sealing portion can be heat-sealed and fixed.

[0042] In some embodiments, the edge sealing device includes a heating element; or, the edge sealing device includes multiple heating elements, and the multiple heating elements are arranged at intervals on one side of the connecting member.

[0043] Such an arrangement enables the fixed areas formed by fixing the edge sealing portion at the same end of the electrode assembly to be arranged continuously or at intervals.

[0044] In some embodiments, the battery processing equipment further comprises:

[0045] An assembly device for assembling the electrode assembly to form a battery cell;

[0046] A stacking device is used to stack multiple battery cells to form a battery.

[0047] With this arrangement, a battery can be obtained.

[0048] In a fifth aspect, an embodiment of the present application provides a battery processing method, which is applied to a battery cell; comprising:

[0049] At least a portion of the edge sealing portion of the diaphragm that extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet is fixedly connected.

[0050] The battery processing method provided in the embodiment of the present application fixes at least a portion of the edge sealing portion of the diaphragm that extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet, so that at least a portion of the diaphragm is fixedly connected to the edge of the positive electrode sheet and the edge of the negative electrode sheet, thereby fixing the position of at least a portion of the diaphragm to a certain extent. In this way, the diaphragm can stably and securely wrap the positive electrode sheet and the negative electrode sheet to isolate the positive electrode sheet and achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of the positive electrode sheet and the negative electrode sheet overlapping due to the folding of the diaphragm, and thus improving the reliability of the battery cell.

[0051] In some embodiments, fixing and connecting at least a portion of the edge seal portion of the separator that extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet includes:

[0052] The edge sealing portion of the separator located outside the edge of the same end of the positive electrode sheet and the negative electrode sheet is fixedly connected.

[0053] In this way, the edge sealing portions at each end can wrap the positive electrode sheet and the negative electrode sheet at the corresponding ends, so that the diaphragm can stably achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of overlapping the positive electrode sheet and the negative electrode sheet at the corresponding ends.

[0054] In some embodiments, fixing and connecting the edge sealing portion of the separator outside the edge of the same end of the positive electrode sheet and the negative electrode sheet includes:

[0055] Pressing the edge sealing device onto the edge sealing portion of the diaphragm beyond the edge of the same end of the positive electrode sheet and the negative electrode sheet;

[0056] The edge sealing device heats the edge sealing portion.

[0057] By adopting the above technical solution, the edge sealing portion is fixed by heat sealing.

[0058] In some embodiments, before fixing and connecting at least a portion of the edge sealing portion of the separator that extends beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet, the method includes:

[0059] The positive electrode sheet, the negative electrode sheet and the separator are stacked or wound.

[0060] In this way, after the positive electrode sheet, the negative electrode sheet and the separator are stacked or wound to form an electrode assembly, the edge sealing portion is fixedly connected.

[0061] 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

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. 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 any creative work.

[0063] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0064] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0065] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0066] FIG4 is a partially expanded schematic diagram of the electrode assembly of the battery cell provided in FIG3 of the present application;

[0067] FIG5 is a schematic diagram of a battery cell provided in some other embodiments of the present application;

[0068] FIG6 is a schematic diagram of an electrode assembly of the battery cell provided in FIG5 ;

[0069] FIG7 is a schematic diagram of an electrode assembly of a battery cell provided in some other embodiments of the present application;

[0070] FIG8 is a cross-sectional view taken along AA in FIG6 ;

[0071] FIG9 is a schematic diagram of FIG8 before the edge sealing portion is fixed;

[0072] FIG10 is a side view of the electrode assembly provided in FIG6 according to some embodiments;

[0073] FIG11 is a side view of the electrode assembly provided in FIG6 under other embodiments;

[0074] FIG12 is a cross-sectional view taken along line BB of FIG7 ;

[0075] FIG13 is a schematic diagram of battery processing equipment provided by some embodiments of the present application;

[0076] FIG14 is a schematic diagram of an edge sealing device of a battery processing equipment provided by some embodiments of the present application;

[0077] FIG15 is a schematic diagram of an edge sealing device of a battery processing equipment provided in other embodiments of the present application;

[0078] FIG16 is a flow chart of a battery processing method provided in some embodiments of the present application.

[0079] Among them, the figure marks in the figure are: 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-casing; 201-accommodation space; 21-first part; 22-second part; 11-electrode assembly; 111-positive electrode sheet; 112-negative electrode sheet; 113-diaphragm; 1131-edge sealing part; 1132-main body; 114-positive electrode tab; 115-negative electrode tab; 12-shell assembly; 121-shell; 122-end cover; 2000-battery processing equipment; 2100-edge sealing device; 2110-connector; 2120-heating element; 2200-assembly device; 2300-stacking device; 2400-winding device; m-fixing area; a-main structure; L-center axis; Z-first direction; Y-second direction; X-third direction. DETAILED DESCRIPTION

[0080] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0081] Unless otherwise specified, all implementations and optional implementations of the embodiments of the present application can be combined with each other to form a new technical solution.

[0082] Unless otherwise specified, all technical features and optional technical features of the embodiments of the present application can be combined with each other to form a new technical solution.

[0083] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0085] In the description of the embodiments of the present application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0086] In the description of the embodiments of this application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," and the like should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0087] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0088] In the description of the embodiments of this application, unless otherwise expressly specified or limited, the technical terms "adjacent" and "adjacent" refer to proximity in position. For example, for components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, meaning A2 is adjacent to B. Alternatively, B is adjacent to A2, or in other words, A2 is adjacent to B. For another example, if there are multiple components C, namely C1, C2, ..., CN, and one of the components C, such as C2, is closer to component B than the other components C, then B is adjacent to C2, or in other words, C2 is adjacent to B.

[0089] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0090] A battery cell typically includes a housing and an electrode assembly at least partially disposed within the housing. The electrode assembly is the component within the battery cell where the electrochemical reaction occurs. The electrode assembly is primarily composed of a stacked or wound arrangement of positive and negative electrode sheets, with a separator disposed between the positive and negative electrode sheets. The separator is an insulating structure with insulating properties, used to insulate the positive and negative electrode sheets, thereby reducing the problem of self-discharge in the electrode assembly caused by overlapping positive and negative electrode sheets.

[0091] In some cases, after the positive electrode sheet, negative electrode sheet, and separator form an electrode assembly, there is a risk that the separator may fold over. This folding of the separator may result in the separator being unable to wrap around the electrode sheet, causing the positive and negative electrode sheets to overlap and leading to self-discharge in the electrode assembly. The electrode sheet referred to herein can be either a positive electrode sheet or a negative electrode sheet.

[0092] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, an electrical device, a battery processing equipment, and a method. By extending at least a portion of the diaphragm beyond the edge of the positive electrode sheet and the edge of the negative electrode sheet to form an edge seal, and at least a portion of the edge seal is fixedly connected, so that at least a portion of the diaphragm is fixedly connected outside the edge of the positive electrode sheet and the edge of the negative electrode sheet, thereby fixing the position of at least a portion of the diaphragm to a certain extent. In this way, the diaphragm can stably and securely wrap the positive electrode sheet and the negative electrode sheet to achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of overlapping of the positive electrode sheet and the negative electrode sheet caused by folding of the diaphragm, and thus improving the reliability of the battery cell.

[0093] It should be noted here that battery processing equipment and methods refer to battery processing equipment and battery processing methods.

[0094] In some embodiments, the battery cells and batteries involved in the embodiments of the present application can be used in electrical devices that use the battery cells or batteries as a power source.

[0095] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like. According to the drive mode, vehicles may be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0096] In other embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, such as energy storage containers, energy storage cabinets, and the like.

[0097] The battery involved in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0098] In some embodiments, the battery may be a battery module. When multiple battery cells are present, the multiple battery cells are arranged and secured to form a battery module. For example, the multiple battery cells may be secured to form a battery module using cable ties or other similar means. For example, the multiple battery cells may also be secured to form a battery module using end plates, side plates, or other similar means.

[0099] In other embodiments, the battery may be a battery pack, which may include a housing and battery cells. As an example, the battery cells may be directly housed in the housing. As an example, multiple battery cells may be first formed into a battery module and then housed in the housing.

[0100] The battery cells referred to in the embodiments of this application are the smallest units that store and output electrical energy. These cells can be secondary batteries or primary batteries. They can be, but are not limited to, metal batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries. They can be cylindrical, flat, rectangular, or other shapes.

[0101] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0102] In some embodiments, please refer to FIG1 , which is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The interior of the vehicle 1000 is provided with the above-mentioned battery 100, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0103] In some embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0104] In some embodiments, please refer to Figure 2, which is an exploded schematic diagram of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 has a structure with a storage space 201 therein and can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 21 and a second portion 22, which overlap each other and together define the storage space 201.

[0105] The first portion 21 may be a hollow structure with an opening at one end, and the second portion 22 may be a plate-like structure. The second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodation space 201. Alternatively, referring to FIG. 2 , the first portion 21 and the second portion 22 may both be hollow structures with an opening at one end, with the open side of the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodation space 201.

[0106] The box body 20 composed of the first part 21 and the second part 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0107] In some embodiments, referring to FIG. 2 , multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 10 may be directly accommodated in the aforementioned accommodation space 201 of the housing 20. In other embodiments, multiple battery cells 10 may also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form a battery module, and the battery module may be accommodated in the aforementioned accommodation space 201 of the housing 20. In still other embodiments, multiple battery cells 10 may also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form multiple battery modules, and then the multiple battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the aforementioned accommodation space 201 of the housing 20.

[0108] In some embodiments, the housing 20 of the battery 100 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may form at least a portion of the chassis of the vehicle 1000, or a portion of the housing 20 may form at least a portion of a cross member or a longitudinal member of the vehicle 1000.

[0109] In some embodiments, please refer to Figures 3 to 7 together, and in combination with other drawings. Figure 3 is a schematic diagram of the decomposition of the battery cell 10 provided in some embodiments of the present application, Figure 4 is a partially expanded schematic diagram of the electrode assembly 11 of the battery cell 10 provided in some embodiments of the present application, Figure 5 is a schematic diagram of the battery cell 10 provided in other embodiments of the present application, and Figure 6 is a schematic diagram of the electrode assembly 11 of the battery cell 10 provided in other embodiments of the present application. Figure 7 is a schematic diagram of the electrode assembly 11 of the battery cell 10 provided in still other embodiments of the present application, specifically a schematic diagram of the electrode assembly 11 along the second direction Y involved below. Among them, in Figures 3 to 6, the electrode assembly 11 is mainly composed of a positive electrode sheet 111, a negative electrode sheet 112 and a separator 113 wound together, which is a winding structure involved below. In Figure 7, the electrode assembly 11 is mainly composed of a positive electrode sheet 111, a negative electrode sheet 112 and a separator 113 stacked together, which is a stacked structure involved below.

[0110] The battery cell 10 may include an electrode assembly 11 .

[0111] The electrode assembly 11 is the component within the battery cell 10 where the electrochemical reaction occurs. The electrode assembly 11 is primarily composed of a positive electrode sheet 111 and a negative electrode sheet 112 wound together, forming a wound structure, as shown in Figures 3 to 6 . Alternatively, the electrode assembly 111 is primarily composed of a stacked positive electrode sheet 111 and a stacked negative electrode sheet 112, forming a stacked structure, as shown in Figure 7 . A separator 113 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112.

[0112] When the electrode assembly 11 is a wound structure, the positive electrode sheet 111 , the negative electrode sheet 112 and the separator 113 are wound.

[0113] When the electrode assembly 11 has a stacked structure, multiple separators 113 can be alternately stacked between the positive electrode sheet 111 and the negative electrode sheet 112, that is, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked to form the electrode assembly 11, as shown in FIG7 ; alternatively, the separator 113 can be arranged between the positive electrode sheet 111 and the negative electrode sheet 112 in a winding manner, that is, the separator 113 is bent during the process of alternatingly stacking the positive electrode sheet 111 and the negative electrode sheet 112, so that the separator 113 is provided between the positive electrode sheet 111 and the negative electrode sheet 112. That is, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are wound.

[0114] Among them, both the positive electrode sheet 111 and the negative electrode sheet 112 have active materials. The electrode assembly 11 is also provided with a positive electrode tab 114 and a negative electrode tab 115. The positive electrode tab 114 is connected to the positive electrode sheet 111, and the negative electrode tab 115 is connected to the negative electrode sheet 112. The positive electrode tab 114 and the negative electrode tab 115 can be located together at one end of the electrode assembly 11, as shown in Figures 3 and 4; or, the positive electrode tab 114 and the negative electrode tab 115 can also be located at opposite ends of the electrode assembly 11, as shown in Figures 5 to 7. The diaphragm 113 is an insulating structure with insulating properties, which is used to achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112, so as to improve the problem of self-discharge of the electrode assembly 11 caused by overlapping the positive electrode sheet 111 and the negative electrode sheet 112.

[0115] In the battery cell 10 , the shape of the electrode assembly 11 can be cylindrical, square, flat, etc.

[0116] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0117] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound structure, a stacked structure, etc.

[0118] In some embodiments, the battery cell 10 may further include an electrolyte, which functions to conduct ions between the positive electrode sheet 111 and the negative electrode sheet 112. During the movement of ions between the positive electrode sheet 111 and the negative electrode sheet 112, the ions must pass through the separator 113 between the positive electrode sheet 111 and the negative electrode sheet 112. The electrolyte involved in the embodiments of the present application may be liquid, gel, or solid.

[0119] In some embodiments, referring to Figures 3 to 5 in conjunction with other figures, the battery cell 10 may further include a housing assembly 12 . The housing assembly 12 is a component or assembly used to define the internal environment of the battery cell 10 . The electrode assembly 11 and the electrolyte are housed within the housing assembly 12 .

[0120] In some embodiments, please refer to Figures 3 to 5 together, and in conjunction with other figures. The shell assembly 12 may include a shell 121 and an end cap 122. The shell 121 and the end cap 122 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 121 and the end cap 122 is used to accommodate the electrode assembly 11 and the electrolyte. The shell 121 and the end cap 122 may be independent components. Specifically, the shell 121 has an opening, and the end cap 122 is provided at the opening of the shell 121 to jointly define the internal environment of the battery cell 10 with the shell 121 and isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell 121 and the end cap 122 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 122 and the shell 121 before the electrode assembly 11 is placed in the shell. After the electrode assembly 11 is placed in the shell, when the electrode assembly 11 needs to be encapsulated, the end cap 122 is used to cover the shell 121.

[0121] The number of the end cap 122 may be one, as shown in FIG3 . Alternatively, the number of the end cap 122 may be two, and the two end caps 122 are respectively disposed at opposite ends of the housing 121 , as shown in FIG5 .

[0122] The shell 121 may be cylindrical, square, or other shapes, depending on the shape and size of the electrode assembly 11. Furthermore, the shell 121 and the end cap 122 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0123] Please refer to Figures 3 to 7 together, and in conjunction with other drawings. In Figure 4, part of the positive electrode sheet 111, part of the negative electrode sheet 112 and part of the separator 113 are unfolded, and the outlines of the unfolded positive electrode sheet 111 and the unfolded negative electrode sheet 112 are drawn with dotted lines, and the edge sealing portion 1131 of the separator 113 is the shaded area. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 11, and the electrode assembly 11 includes a positive electrode sheet 111, a negative electrode sheet 112 and a separator 113. In some possible designs, please refer to Figure 7, the positive electrode sheet 111, the negative electrode sheet 112 and the separator 113 are stacked to form a stacked structure of the electrode assembly 11; or, in other possible designs, please refer to Figures 3 to 6 together, the positive electrode sheet 111, the negative electrode sheet 112 and the separator 113 are wound to form a wound structure of the electrode assembly 11. In this way, a separator 113 is provided between the positive electrode sheet 111 and the negative electrode sheet 112, so that the separator 113 can provide insulation between the positive electrode sheet 111 and the negative electrode sheet 112. Part of the separator 113 extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112 to form a sealing edge 1131. At least a portion of the sealing edge 1131 is fixedly connected.

[0124] The edge seal 1131 refers to a portion of the separator 113, specifically the portion of the separator 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112. It can be understood that the separator 113 includes a main body 1132 and an edge seal 1131 connected to the main body 1132. At least a portion of the main body 1132 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112 to provide insulation between the positive electrode sheet 111 and the negative electrode sheet 112. The remaining portion of the separator 113, excluding the main body 1132, extends beyond the edge of the positive electrode sheet 111 and the negative electrode sheet 112 to form the edge seal 1131. Specifically, at least a portion of the main body 1132 of the separator 113 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112, so that the separator 113 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112. The main body 1132 of the separator 113 , the positive electrode sheet 111 , and the negative electrode sheet 112 constitute the main structure a of the electrode assembly 11 .

[0125] In some possible designs, the main body 1132 is only disposed between the positive electrode sheet 111 and the negative electrode sheet 112 to achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112. Alternatively, in other possible designs, a portion of the main body 1132 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112 to achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112; another portion of the main body 1132 is disposed on the outer side of the overall structure formed by the positive electrode sheet 111 and the negative electrode sheet 112, thereby wrapping the overall structure formed by the positive electrode sheet 111 and the negative electrode sheet 112. This can improve the problem of overlap between the electrode assembly 11 and the external electrical structure, as shown in FIG7 .

[0126] As an example, when the electrode assembly 11 is a stacked structure, a portion of the main body 1132 is arranged between the positive electrode sheet 111 and the negative electrode sheet 112; along the stacking direction of the positive electrode sheet 111 and the negative electrode sheet 112, another portion of the main body 1132 can be arranged on the opposite sides of the overall structure formed by the positive electrode sheet 111 and the negative electrode sheet 112, that is, the electrode assembly 11 has the main body 1132 of the diaphragm 113 on both opposite sides of the stacking direction of the positive electrode sheet 111 and the negative electrode sheet 112.

[0127] It should be noted that both the positive electrode sheet 111 and the negative electrode sheet 112 are sheet-like structures. Thus, each of the positive electrode sheet 111 and the negative electrode sheet 112 has four sides. The edge of the positive electrode sheet 111 refers to the side edge of the positive electrode sheet 111. The edge of the negative electrode sheet 112 refers to the side edge of the negative electrode sheet 112.

[0128] In some possible designs, as shown in Figures 3 to 6, the electrode assembly 11 has a wound structure. Specifically, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 can be wound around a central axis L, and the central axis L is parallel to the first direction Z. The edge of the positive electrode sheet 111 can include the edge of one end of the positive electrode sheet 111 along the first direction Z or the edges of two opposite ends, or can also include the edge of one end of the positive electrode sheet 111 along the winding direction of the positive electrode sheet 111 or the edges of two opposite ends. Correspondingly, the edge of the negative electrode sheet 112 can include the edge of one end of the negative electrode sheet 112 along the first direction Z or the edges of two opposite ends, or can also include the edge of one end of the negative electrode sheet 112 along the winding direction of the negative electrode sheet 112 or the edges of two opposite ends. The winding direction of the positive electrode sheet 111, the winding direction of the separator 113, and the winding direction of the negative electrode sheet 112 are substantially the same and can be collectively referred to as the winding direction of the electrode assembly 11. It is understood that the portion of the separator 113 extending beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112 may include the case where the portion of the separator 113 extends beyond the edge of one end or the edges of both opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z, or may also include the case where the portion of the separator 113 extends beyond the edge of one end or the edges of both opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the winding direction of the electrode assembly 11. That is, the edge of at least one of the four opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z and the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the winding direction of the electrode assembly 11 may be provided with an edge seal 1131. In other words, at least one of the opposite ends of the electrode assembly 11 along the first direction Z and the opposite ends of the electrode assembly 11 along the winding direction of the electrode assembly 11 has an edge seal 1131. As an example, part of the diaphragm 113 extends beyond the edge of one end of the positive electrode sheet 111 and the negative electrode sheet 112 along the winding direction of the electrode assembly 11, so that in the winding direction of the electrode assembly 11, the diaphragm 113 continues to be wound after the positive electrode sheet 111, the negative electrode sheet 112 and the diaphragm 113 are wound, that is, the electrode assembly 11 is terminated with the diaphragm 113 after the winding is completed.

[0129] In some other possible designs, as shown in FIG7 , the electrode assembly 11 is a stacked structure. Specifically, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked along the second direction Y. The edge of the positive electrode sheet 111 may include the edge of one end of the positive electrode sheet 111 along the first direction Z or the edges of two opposite ends, and may also include the edge of one end of the positive electrode sheet 111 along the third direction X or the edges of two opposite ends. The edge of the negative electrode sheet 112 may include the edge of one end of the negative electrode sheet 112 along the first direction Z or the edges of two opposite ends, and may also include the edge of one end of the negative electrode sheet 112 along the third direction X or the edges of two opposite ends. It is understood that the portion of the separator 113 extending beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112 may include the case where the portion of the separator 113 extends beyond the edge of one end or the edges of both opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z, or may also include the case where the portion of the separator 113 extends beyond the edge of one end or the edges of both opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X. That is, the edge of at least one of the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z and the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X may be provided with an edge seal 1131. In other words, at least one of the opposite ends of the electrode assembly 11 along the first direction Z and the opposite ends of the electrode assembly 11 along the third direction X has an edge seal 1131.

[0130] The second direction Y intersects the first direction Z, the first direction Z intersects the third direction X, and the second direction Y intersects the third direction X. The first direction Z and the second direction Y intersect each other, meaning that the first direction Z and the second direction Y may form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction Y are not parallel. The first direction Z and the second direction Y may be perpendicular to each other or not. The first direction Z and the second direction Y may be intersecting directions located on the same plane or on different planes, and the projection of the second direction Y on the plane containing the first direction Z may intersect the first direction Z. Accordingly, the meaning of the first direction Z intersecting the third direction X and the second direction Y intersecting the third direction X can be interpreted similarly and will not be repeated here. As an example, the first direction Z and the second direction Y are perpendicular, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X. In some cases, the first direction Z may be the length or height direction of the battery cell 10, the second direction Y may be the thickness direction of the battery cell 10, and the third direction X may be the width direction of the battery cell 10.

[0131] At least a portion of the edge seals 1131 are fixedly connected, which means that among all the edge seals 1131 of the electrode assembly 11, a portion of the edge seals 1131 are fixedly connected; or, alternatively, all the edge seals 1131 are fixedly connected. Specifically, among the four ends of the electrode assembly 11, namely, the two opposite ends along the first direction Z, the two opposite ends along the winding direction of the electrode assembly 11, or the two opposite ends along the first direction Z, the two opposite ends along the third direction X, at least one end of the electrode assembly 11 has an edge seal 1131. When only one end of the electrode assembly 11 has an edge seal 1131, the edge seal 1131 at that end is fixedly connected. When multiple ends of the electrode assembly 11 have edge seals 1131, the edge seals 1131 at each end of the electrode assembly 11 are fixedly connected, as shown in Figures 4 to 7; alternatively, the edge seals 1131 at some ends of the electrode assembly 11 are fixedly connected, while the edge seals 1131 at other ends of the electrode assembly 11 are not fixedly connected. Specifically, when the edge seals 1131 at multiple ends of the electrode assembly 11 are fixedly connected, the edge seals 1131 at each end of the electrode assembly 11 are individually fixedly connected; alternatively, the edge seals 1131 at at least two ends of the electrode assembly 11 are fixedly connected together, for example, the edge seals 1131 at adjacent ends of the electrode assembly 11 are fixedly connected together.

[0132] For example, as shown in Figures 4 and 6, the electrode assembly 11 has a wound structure, and the electrode assembly 11 has edge sealing portions 1131 at both opposite ends along the first direction Z. As an example, as shown in Figures 4 and 6, the edge sealing portions 1131 at each end of the electrode assembly 11 are fixedly connected; as another example, the edge sealing portion 1131 at one end of the electrode assembly 11 is fixedly connected, and the edge sealing portion 1131 at the other end of the electrode assembly 11 is not fixedly connected. The edge sealing portion 1131 at one end of the electrode assembly 11 and the edge sealing portion 1131 at the other end of the electrode assembly 11 can be fixedly connected separately, or they can be fixed together.

[0133] For another example, as shown in FIG7 , the electrode assembly 11 has a stacked structure, and the four ends of the electrode assembly 11, namely, the opposite ends along the first direction Z and the opposite ends along the third direction X, all have edge seals 1131. As an example, as shown in FIG7 , the edge seals 1131 at each end of the electrode assembly 11 are fixedly connected; as another example, the edge seals 1131 at some ends of the electrode assembly 11 are fixedly connected, and the edge seals 1131 at other ends of the electrode assembly 11 are not fixedly connected. When the edge seals 1131 at multiple ends of the electrode assembly 11 are fixedly connected, the edge seals 1131 at each end of the electrode assembly 11 are individually fixedly connected, or the edge seals 1131 at at least two ends of the electrode assembly 11 are fixed together.

[0134] By fixing at least a portion of the edge sealing portion 1131 so that the position of at least a portion of the edge sealing portion 1131 is fixed to a certain extent, the insulating effect of the separator 113 on the positive electrode sheet 111 and the negative electrode sheet 112 can be maintained. For example, the edge sealing portions 1131 formed by the separator 113 on opposite sides of the positive electrode sheet 111 are fixedly connected, so that the edge sealing portions 1131 formed by the separator 113 on opposite sides of the positive electrode sheet 111 can stably and securely wrap the positive electrode sheet 111, thereby allowing the separator 113 to stably isolate the positive electrode sheet 111 from the adjacent negative electrode sheet 112, thereby preventing the problem of overlapping of the positive electrode sheet 111 and the adjacent negative electrode sheet 112 to a certain extent. For another example, the edge sealing portions 1131 formed by the diaphragm 113 located on opposite sides of the negative electrode sheet 112 are fixedly connected, so that the edge sealing portions 1131 formed by the diaphragm 113 located on opposite sides of the negative electrode sheet 112 stably and securely wrap the negative electrode sheet 112, so that the diaphragm 113 can stably isolate the negative electrode sheet 112 and the adjacent positive electrode sheet 111, thereby preventing the problem of overlapping of the negative electrode sheet 112 and the adjacent positive electrode sheet 111 to a certain extent.

[0135] The battery cell 10 provided in the embodiment of the present application forms an edge-sealing portion 1131 by extending at least a portion of the diaphragm 113 beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, and at least a portion of the edge-sealing portion 1131 is fixedly connected, so that at least a portion of the diaphragm 113 is fixedly connected outside the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, thereby making the position of at least a portion of the diaphragm 113 fixed to a certain extent. In this way, the diaphragm 113 can stably and securely wrap the positive electrode sheet 111 and the negative electrode sheet 112 to isolate the positive electrode sheet 111 and the negative electrode sheet 112, thereby achieving insulation between the positive electrode sheet 111 and the negative electrode sheet 112, thereby improving the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 due to folding of the diaphragm 113, thereby improving the reliability of the battery cell 10.

[0136] In addition, by fixing at least a portion of the diaphragm 113 to the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, the insulating protection effect of the diaphragm 113 between the positive electrode sheet 111 and the negative electrode sheet 112 can be improved. In this way, the step of compositely fixing the diaphragm 113 to the positive electrode sheet 111 can be omitted, and the step of compositely fixing the diaphragm 113 to the negative electrode sheet 112 can also be omitted. Based on this, on the one hand, the problem of poor air permeability of the diaphragm 113 caused by composite fixing of the diaphragm 113 to the positive electrode sheet 111 and the composite fixing of the diaphragm 113 to the negative electrode sheet 112 can be improved. In this way, the problem of poor ion conductivity of the diaphragm 113 caused by poor air permeability of the diaphragm 113 can be improved, and the ion conductivity of the diaphragm 113 can be improved, thereby improving the charge and discharge performance of the battery cell 10, and further improving the dynamic performance of the battery cell 10. On the other hand, it can also improve the problem that the adhesion performance of the diaphragm 113 is deteriorated due to the composite fixation of the diaphragm 113 on the positive electrode plate 111 and the composite fixation of the diaphragm 113 on the negative electrode plate 112, and thus improve the problem that the adhesion performance of the diaphragm 113 is deteriorated, resulting in the electrode assembly 11 being unable to be firmly fixed together after shaping and thus easily falling apart. In this way, the structural integrity of the electrode assembly 11 can be improved, and thus it helps to improve the charge and discharge performance of the battery cell 10, thereby improving the dynamic performance of the battery cell 10.

[0137] In some embodiments, please refer to Figures 4, 6, 9, and other accompanying figures. Figure 8 is a cross-sectional view taken along line AA of Figure 6, and Figure 9 is a schematic diagram of the edge seal 1131 of Figure 8 before being fixed. The edge seal 1131 located outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112 is fixedly connected.

[0138] It is understood that the edge seals 1131 at the same end of the electrode assembly 11 are fixed together. Specifically, when only one end of the electrode assembly 11 has an edge seal 1131, the edge seals 1131 are fixed together. When the electrode assembly 11 has edge seals 1131 at multiple ends, only one of the edge seals 1131 is fixed together; alternatively, the edge seals 1131 at at least two ends are fixedly connected, and the edge seals 1131 at the same end are fixedly connected.

[0139] The edge sealing portions 1131 at at least two ends are fixedly connected, and the edge sealing portions 1131 at the same end are fixedly connected respectively, which means that among the edge sealing portions 1131 at at least two ends of the electrode assembly 11, the edge sealing portion 1131 at one end is fixedly connected separately, and the edge sealing portion 1131 at the other end is also fixedly connected separately, that is, the edge sealing portions 1131 at at least two ends of the electrode assembly 11 are fixed separately.

[0140] As an example, when the electrode assembly 11 has a wound structure, as shown in Figures 4 and 6, the electrode assembly 11 has edge seals 1131 at both opposite ends along the first direction Z. Only the edge seal 1131 at one end of the electrode assembly 11 is fixedly connected; alternatively, the edge seals 1131 at both opposite ends of the electrode assembly 11 are fixed.

[0141] As another example, when the electrode assembly 11 has a stacked structure, as shown in FIG7 , the electrode assembly 11 has edge seals 1131 at both opposite ends along the first direction Z and at both opposite ends along the third direction X. The edge seal 1131 at only one end of the electrode assembly 11 is fixedly connected; alternatively, the edge seals 1131 at at least both ends of the electrode assembly 11 are fixedly connected.

[0142] By fixing the edge sealing portion 1131 outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112, the edge sealing portion 1131 formed by the diaphragm 113 on the opposite sides of any positive electrode sheet 111 at the same end of the electrode assembly 11 is fixedly connected, thereby wrapping the positive electrode sheet 111. In addition, the edge sealing portion 1131 formed by the diaphragm 113 on the opposite sides of any negative electrode sheet 112 is fixedly connected, thereby wrapping the negative electrode sheet 112. In this way, the edge sealing portion 1131 at each end can wrap the positive electrode sheet 111 and the negative electrode sheet 112 at the corresponding end, so that the diaphragm 113 can stably achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112, thereby improving the problem of overlapping the positive electrode sheet 111 and the negative electrode sheet 112 at the corresponding end. For example, as shown in Figures 8 and 9, the edge sealing portion 1131 of one end (the left end) of the electrode assembly 11 along the first direction Z is separately fixedly connected to achieve wrapping and insulation of the positive electrode sheet 111 and the negative electrode sheet 112 along one end of the first direction Z, thereby improving the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 at one end of the first direction Z. The edge sealing portion 1131 of the other end (the right end) of the electrode assembly 11 along the first direction Z is also separately fixedly connected to achieve wrapping and insulation of the positive electrode sheet 111 and the negative electrode sheet 112 along the other end of the first direction Z, thereby improving the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 at the other end of the first direction Z.

[0143] In some embodiments, please refer to Figures 10 and 11 in conjunction with other figures. Figure 10 is a side view of the electrode assembly 11 provided in Figure 6 in some embodiments, and Figure 11 is a side view of the electrode assembly 11 provided in Figure 6 in other embodiments. Figures 10 and 11 provide side views of the electrode assembly 11, specifically schematic views of the electrode assembly 11 from a perspective in the first direction Z, specifically the left view of Figure 6. In Figures 10 and 11, the shaded area represents the fixed region m. The edge seal 1131 located outside the edge of the common end of the positive electrode sheet 111 and the negative electrode sheet 112 is fixedly formed with the fixed region m. Furthermore, the fixed regions m located outside the edge of the common end of the positive electrode sheet 111 and the negative electrode sheet 112 may be arranged continuously, as shown in Figure 10; alternatively, the fixed regions m located outside the common end of the positive electrode sheet 111 and the negative electrode sheet 112 may be arranged at intervals, as shown in Figure 11.

[0144] The fixed area m refers to the area where the edge sealing portion 1131 is fixedly connected, that is, the specific location where the edge sealing portion 1131 is fixedly connected.

[0145] The fixing regions m outside the edges of the positive electrode sheet 111 and the negative electrode sheet 112 at the same end are continuously arranged, which means that there is only one fixing region m at the same end of the electrode assembly 11 .

[0146] The fixed areas m outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112 are arranged at intervals, which means that there are multiple fixed areas m at the same end of the electrode assembly 11, and the multiple fixed areas m are distributed at intervals.

[0147] Such an arrangement makes the fixing operation of the edge sealing portion 1131 very flexible.

[0148] In addition, by spacing the fixed area m outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112, it is convenient for the electrolyte to penetrate from the edge sealing portion 1131 to the middle position of the electrode assembly 11, thereby improving the wetting efficiency of the electrode assembly 11.

[0149] The fixed area m can be in a square, circle, triangle or other shapes.

[0150] In some embodiments, please refer to Figures 4 to 7 in conjunction with other drawings. In some possible designs, as shown in Figure 4, a positive electrode tab 114 and a negative electrode tab 115 are provided at intervals at one end of the electrode assembly 11 along the first direction Z; or, in other possible designs, as shown in Figures 5 to 7, a positive electrode tab 114 and a negative electrode tab 115 are provided at opposite ends of the electrode assembly 11 along the first direction Z. The positive electrode tab 114 is connected to the positive electrode sheet 111, and the negative electrode tab 115 is connected to the negative electrode sheet 112. An edge sealing portion 1131 is provided on the outside of at least one end of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z.

[0151] It is understood that the electrode assembly 11 further includes a positive electrode tab 114 and a negative electrode tab 115. As shown in FIG4 , the positive electrode tab 114 and the negative electrode tab 115 are spaced apart and arranged at one end of the electrode assembly 11 along the first direction Z; or, as shown in FIG5 to FIG7 , the positive electrode tab 114 and the negative electrode tab 115 are respectively arranged at opposite ends of the electrode assembly 11 along the first direction Z. It is also understood that the positive electrode sheet 111, the negative electrode sheet 112, and the main body 1132 of the separator 113 are stacked or wound to form the main structure a. As shown in FIG4 , the positive electrode tab 114 and the negative electrode tab 115 are spaced apart and arranged at one end of the main structure a along the first direction Z; or, as shown in FIG5 to FIG7 , the positive electrode tab 114 and the negative electrode tab 115 are respectively arranged at opposite ends of the main structure a along the first direction Z.

[0152] The positive electrode tab 114 is connected to the positive electrode sheet 111 so that the positive electrode tab 114 and the positive electrode sheet 111 are electrically connected, so that the positive electrode tab 114 can serve as a current transmission end for the positive electrode sheet 111. The negative electrode tab 115 is connected to the negative electrode sheet 112 so that the negative electrode tab 115 and the negative electrode sheet 112 are electrically connected, so that the negative electrode tab 115 can serve as a current transmission end for the negative electrode sheet 112.

[0153] A sealing edge portion 1131 is provided on the outside of at least one end of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z, which means that a sealing edge portion 1131 is provided on at least one end of the electrode assembly 11 along the first direction Z. It can also be understood that the main structure a is connected to the sealing edge portion 1131 at least at one end along the first direction Z.

[0154] Based on this, when the electrode assembly 11 is provided with an edge seal 1131 at one end along the first direction Z, the edge seal 1131 can be fixedly connected. When the electrode assembly 11 is provided with edge seals 1131 at both opposite ends along the first direction Z, the edge seals 1131 at the opposite ends of the electrode assembly 11 along the first direction Z can each be fixedly connected separately; alternatively, the edge seal 1131 at one end of the electrode assembly 11 along the first direction Z can be fixedly connected.

[0155] Such an arrangement allows the edge sealing portions 1131 outside at least one end of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z to be fixedly connected, so that the diaphragm 113 can wrap the positive electrode sheet 111 and the negative electrode sheet 112 at at least one end of the electrode assembly 11 along the first direction Z, thereby improving the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 at at least one end in the first direction Z.

[0156] It should be noted that in some possible designs, as shown in FIG4 , when the positive electrode tab 114 and the negative electrode tab 115 are spaced apart at one end of the electrode assembly 11 along the first direction Z: when a sealing edge portion 1131 is provided at one end of the electrode assembly 11 along the first direction Z, the sealing edge portion 1131 can be provided at the end of the electrode assembly 11 without the positive electrode tab 114 and the negative electrode tab 115; the sealing edge portion 1131 can also be provided at the end of the electrode assembly 11 with the positive electrode tab 114 and the negative electrode tab 115. In this way, the sealing edge portion 1131 can block the positive electrode tab 114 and the negative electrode tab 115 after being fixedly connected, thereby improving the problem of the positive electrode tab 114 contacting the negative electrode sheet 112 after being bent, causing self-discharge of the electrode assembly 11, and also improving the problem of the negative electrode tab 115 contacting the positive electrode sheet 111 after being bent, causing self-discharge of the electrode assembly 11. When the electrode assembly 11 is provided with edge sealing portions 1131 at the two opposite ends along the first direction Z, as shown in FIG4 , the edge sealing portion 1131 at one end can block the positive electrode tab 114 and the negative electrode tab 115 after being fixedly connected, thereby improving the problem of the positive electrode tab 114 contacting the negative electrode sheet 112 after being bent, causing self-discharge of the electrode assembly 11, and also improving the problem of the negative electrode tab 115 contacting the positive electrode sheet 111 after being bent, causing self-discharge of the electrode assembly 11.

[0157] In other possible designs, as shown in Figures 5 to 7, when the positive electrode tab 114 and the negative electrode tab 115 are respectively arranged at opposite ends of the electrode assembly 11 along the first direction Z: when the electrode assembly 11 has a sealing edge 1131 at one end along the first direction Z, the sealing edge 1131 can be located at the end of the electrode assembly 11 having the positive electrode tab 114, so that after being fixedly connected, the positive electrode tab 114 can be blocked, thereby improving the problem of the positive electrode tab 114 contacting the negative electrode sheet 112 after being bent, causing self-discharge of the electrode assembly 11; the sealing edge 1131 can also be located at the end of the electrode assembly 11 having the negative electrode tab 115, so that after being fixedly connected, the negative electrode tab 115 can be blocked, thereby improving the problem of the negative electrode tab 115 contacting the positive electrode sheet 111 after being bent, causing self-discharge of the electrode assembly 11. When the electrode assembly 11 has edge sealing portions 1131 at opposite ends along the first direction Z, as shown in Figures 5 to 7, the edge sealing portion 1131 at one end can block the positive electrode tab 114 after being fixedly connected, so as to improve the problem of the positive electrode tab 114 contacting the negative electrode sheet 112 after being bent, causing self-discharge of the electrode assembly 11; the edge sealing portion 1131 at the other end can block the negative electrode tab 115 after being fixedly connected, so as to improve the problem of the negative electrode tab 115 contacting the positive electrode sheet 111 after being bent, causing self-discharge of the electrode assembly 11.

[0158] In some embodiments, referring to Figures 4 to 7 in conjunction with other figures, edge seals 1131 are provided on opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z. The edge seals 1131 located on opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z are fixedly connected.

[0159] It can be understood that the electrode assembly 11 is provided with edge sealing portions 1131 at both opposite ends along the first direction Z. Among the edge sealing portions 1131 at both opposite ends of the electrode assembly 11 along the first direction Z, the edge sealing portions 1131 at each end are fixedly connected.

[0160] This arrangement allows the separator 113 to be fixedly connected to opposite ends of the electrode assembly 11 along the first direction Z, thereby wrapping the positive electrode sheet 111 and the negative electrode sheet 112 at opposite ends of the electrode assembly 11 along the first direction Z. In this way, the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 at opposite ends of the first direction Z can be improved.

[0161] In some embodiments, referring to FIG. 4 and in conjunction with other figures, a positive electrode tab 114 and a negative electrode tab 115 are spaced apart and disposed at one end of the electrode assembly 11 along a first direction Z. In the first direction Z, an edge seal 1131 is disposed on one end of the positive electrode tab 114 and the negative electrode tab 115 of the positive electrode sheet 111 and the negative electrode sheet 112. Moreover, in the first direction Z, the positive electrode sheet 111 and the negative electrode sheet 112 have an edge sealing portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115, which are fixedly connected and fixed to the positive electrode tab 114; or, in the first direction Z, the positive electrode sheet 111 and the negative electrode sheet 112 have an edge sealing portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115, which are fixedly connected and fixed to the negative electrode tab 115; or, as shown in Figure 4, in the first direction Z, the positive electrode sheet 111 and the negative electrode sheet 112 have an edge sealing portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115, which are fixedly connected and fixed to the positive electrode tab 114 and the negative electrode tab 115.

[0162] The positive electrode sheet 111 and the negative electrode sheet 112 have an edge seal 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115, which is fixedly connected and fixed to the positive electrode tab 114. This can improve the problem of the positive electrode tab 114 overlapping the negative electrode sheet 112 after being bent. The positive electrode sheet 111 and the negative electrode sheet 112 have an edge seal 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115, which is fixedly connected and fixed to the negative electrode tab 115. This can improve the problem of the negative electrode tab 115 overlapping the positive electrode sheet 111 after being bent. The positive electrode sheet 111 and the negative electrode sheet 112 are fixedly connected by the edge sealing portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115, and fixed to the positive electrode tab 114 and the negative electrode tab 115, which can improve the problem of the positive electrode tab 114 overlapping the negative electrode sheet 112 and the negative electrode tab 115 overlapping the positive electrode sheet 111.

[0163] In some embodiments, referring to Figures 5 to 7 in conjunction with other figures, the positive electrode tab 114 and the negative electrode tab 115 are respectively disposed at opposite ends of the electrode assembly 11 along the first direction Z, and the positive electrode sheet 111 and the negative electrode sheet 112 are each provided with an edge seal 1131 at opposite ends along the first direction Z. In some possible designs, the positive electrode sheet 111 and the negative electrode sheet 112 have a sealed edge portion 1131 outside one end of the positive electrode tab 114, which is fixedly connected and fixed to the positive electrode tab 114; or, in other possible designs, the positive electrode sheet 111 and the negative electrode sheet 112 have a sealed edge portion 1131 outside one end of the negative electrode tab 115, which is fixedly connected and fixed to the negative electrode tab 115; or, in some other possible designs, the positive electrode sheet 111 and the negative electrode sheet 112 have a sealed edge portion 1131 outside one end of the positive electrode tab 114, which is fixedly connected and fixed to the positive electrode tab 114, and the positive electrode sheet 111 and the negative electrode sheet 112 have a sealed edge portion 1131 outside one end of the negative electrode tab 115, which is fixedly connected and fixed to the negative electrode tab 115.

[0164] It can be understood that the positive electrode tab 114 and the negative electrode tab 115 are respectively provided at two opposite ends of the electrode assembly 11 along the first direction Z, and both opposite ends of the electrode assembly 11 along the first direction Z have edge sealing portions 1131 .

[0165] The edge seal 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the positive electrode tab 114; the edge seal 1131 at the other end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the negative electrode tab 115. Alternatively, the edge seal 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the positive electrode tab 114. Alternatively, the edge seal 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the negative electrode tab 115.

[0166] The edge sealing portion 1131 is fixedly connected and fixed to the positive electrode tab 114, which can improve the problem of the positive electrode tab 114 overlapping the negative electrode tab 112 causing self-discharge of the electrode assembly 11. The edge sealing portion 1131 is fixedly connected and fixed to the negative electrode tab 115, which can improve the problem of the negative electrode tab 115 overlapping the positive electrode tab 111 causing self-discharge of the electrode assembly 11.

[0167] Furthermore, by disposing the positive electrode tab 114 and the negative electrode tab 115 at opposite ends of the electrode assembly 11 along the first direction Z, the battery cell 10 can be provided with an injection hole at at least one end in a direction perpendicular to the first direction Z. Thus, when electrolyte injection is performed, the battery cell 10 is in a lying position with the first direction Z parallel to the horizontal plane. For example, the electrode assembly 11 is in the position shown in FIG. 6 , where the injection hole is located above the electrode assembly 11. Based on this, after the electrolyte is injected into the battery cell 10, because the separator 113 extends beyond the opposite ends of the positive electrode tab 111 and the negative electrode tab 112 along the first direction Z to form the sealing edge 1131, the electrolyte can penetrate the sealing edge 1131 at the opposite ends of the electrode assembly 11 along the first direction Z, and then penetrate upward, gradually penetrating toward the middle position of the electrode assembly 11 along the first direction Z. This helps to increase the electrolyte penetration speed and penetration amount, thereby improving the electrolyte penetration of the battery cell 10 and the cycle performance of the battery cell 10.

[0168] In some embodiments, please refer to Figures 7 and 12 together, and in conjunction with other drawings. Figure 12 is a cross-sectional view along line BB of Figure 7. The positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked along the second direction Y, so that the electrode assembly 11 is a stacked structure. An edge seal 1131 is provided on at least one end of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X. The first direction Z and the second direction Y intersect, the first direction Z and the third direction X intersect with each other, and the second direction Y and the third direction X intersect.

[0169] It can be understood that, as shown in FIG12 , the positive electrode sheets 111 and the negative electrode sheets 112 are alternately stacked along the second direction Y, and a separator 113 is stacked between any adjacent positive electrode sheets 111 and negative electrode sheets 112 in the second direction Y. That is, in the second direction Y, the electrode assembly 11 is mainly stacked in the order of positive electrode sheet 111, separator 113, negative electrode tab 115, separator 113, positive electrode sheet 111, and so on.

[0170] In some possible designs, the electrode assembly 11 is provided with an edge seal 1131 at one end along the third direction X, and the edge seal 1131 can be fixedly connected. In other possible designs, the electrode assembly 11 is provided with edge seals 1131 at opposite ends along the third direction X, and the edge seals 1131 at opposite ends of the electrode assembly 11 along the third direction X can each be individually fixedly connected; alternatively, the edge seal 1131 at one end of the electrode assembly 11 along the third direction X is fixedly connected.

[0171] Such arrangement enables the sealing edge portions 1131 outside at least one end of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X to be fixedly connected, so that the diaphragm 113 can wrap the positive electrode sheet 111 and the negative electrode sheet 112 at at least one end of the electrode assembly 11 along the third direction X, thereby improving the problem of overlapping at at least one end of the positive electrode sheet 111 and the negative electrode sheet 112 in the third direction X.

[0172] In some embodiments, referring to FIG. 7 and FIG. 12 in conjunction with other drawings, edge seals 1131 are provided on opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X. The edge seals 1131 located on opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X are fixedly connected.

[0173] It can be understood that the electrode assembly 11 is provided with edge sealing portions 1131 at both opposite ends along the third direction X, and the edge sealing portions 1131 at both opposite ends of the electrode assembly 11 along the third direction X are fixedly connected.

[0174] This arrangement allows the separator 113 to be fixedly connected to the opposite ends of the electrode assembly 11 along the third direction X, thereby wrapping the positive electrode sheet 111 and the negative electrode sheet 112 at the opposite ends of the electrode assembly 11 along the third direction X. In this way, the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 at the opposite ends of the third direction X can be improved.

[0175] In some embodiments, the edge sealing portion 1131 is heat sealed.

[0176] Heat sealing refers to sealing the edges by heating. It is understood that after the positive electrode sheet 111, the negative electrode sheet 112 and the separator 113 form the electrode assembly 11, the edge sealing portion 1131 can be heated to melt and fix the edge sealing portion 1131 after heating.

[0177] Alternatively, in some other embodiments, the diaphragm 113 is provided with an adhesive layer at the edge sealing portion 1131 , and the edge sealing portion 1131 is fixedly connected via the adhesive layer.

[0178] The adhesive layer refers to a layer structure with adhesive ability, and may be, but is not limited to, a glue layer with adhesive ability.

[0179] At least one of the two opposing sides of the separator 113 may have an adhesive layer, and the adhesive layer is located at the edge of the separator 113. In this way, when the separator 113, the positive electrode sheet 111, and the negative electrode sheet 112 form the electrode assembly 11, the edge portion 1131 can be bonded and fixed by the adhesive layer.

[0180] Such an arrangement allows for more operating methods for fixing the edge sealing portion 1131 and provides greater flexibility.

[0181] Referring to FIG. 2 and other accompanying drawings, the battery 100 provided in the embodiment of the present application includes a battery cell 10. The battery cell 10 in this embodiment is identical to the battery cell 10 in the previous embodiment. For details, please refer to the description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0182] The battery 100 provided in the embodiment of the present application, by adopting the battery cell 10 involved above, can improve the problem of the positive electrode sheet 111 and the negative electrode sheet 112 being overlapped due to the folding of the diaphragm 113, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery 100.

[0183] Referring to FIG1 , the electrical device provided in an embodiment of the present application includes a battery cell 10 or a battery 100. The battery cell 10 and battery 100 in this embodiment are identical to those in the previous embodiment. For details, please refer to the description of the battery cell 10 and battery 100 in the previous embodiment, which will not be repeated here.

[0184] The electrical device provided in the embodiment of the present application can improve the reliability of the battery cell 10 by adopting the battery cell 10 or the battery 100 mentioned above, thereby improving the reliability of the battery 100 and further improving the reliability of the electrical device.

[0185] Please refer to Figure 13 in conjunction with other accompanying drawings. Figure 13 is a schematic diagram of a battery processing device 2000 provided in some embodiments of the present application. The battery processing device 2000 provided in the embodiments of the present application is applied to a battery cell 10. It can be understood that the battery processing device 2000 is used to process the battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. Please refer to the relevant description of the battery cell 10 in the previous embodiment for details, which will not be repeated here.

[0186] The battery processing equipment 2000 provided in the present application includes an edge sealing device 2100, which is used to fix and connect at least a portion of the edge sealing portion 1131 of the diaphragm 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112.

[0187] The edge sealing device 2100 is a device for fixing and connecting the edge sealing portion 1131 of the diaphragm 113 .

[0188] As an example, the edge sealing device 2100 may be, but is not limited to, a resistive heating device. The edge sealing device 2100 may heat the edge sealing portion 1131 by energizing the edge sealing device 2100, thereby heat-sealing and fixing the edge sealing portion 1131.

[0189] The battery processing equipment 2000 provided in the embodiment of the present application can fix at least a portion of the edge sealing portion 1131 of the diaphragm 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112 by providing an edge sealing device 2100, so that at least a portion of the diaphragm 113 is fixedly connected to the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, thereby making the position of at least a portion of the diaphragm 113 fixed to a certain extent. In this way, the diaphragm 113 can stably and securely wrap the positive electrode sheet 111 and the negative electrode sheet 112 to isolate the positive electrode sheet 111 and the negative electrode sheet 112, thereby achieving insulation between the positive electrode sheet 111 and the negative electrode sheet 112, thereby improving the problem of the positive electrode sheet 111 and the negative electrode sheet 112 overlapping due to the folding of the diaphragm 113, and thus improving the reliability of the battery cell 10.

[0190] In some embodiments, please refer to Figures 13 to 15 in conjunction with other figures. Figure 14 is a schematic diagram of an edge sealing device 2100 of a battery processing device 2000 provided in some embodiments of the present application, and Figure 15 is a schematic diagram of an edge sealing device 2100 of a battery processing device 2000 provided in other embodiments of the present application. The edge sealing device 2100 includes a connector 2110 and a heater 2120. The heater 2120 is disposed on the connector 2110 and is used to heat the edge sealing portion 1131 to secure the edge sealing portion 1131.

[0191] The heating element 2120 refers to a component for heating, and the connecting element 2110 refers to a component for connecting the heating element 2120. The heating element 2120 may be, but is not limited to, a heating resistor.

[0192] Specifically, during operation, the connecting member 2110 can be driven to move so that the heating member 2120 moves to the edge sealing portion 1131 driven by the connecting member 2110. In this way, the edge sealing portion 1131 can be heated by the heating member 2120, thereby achieving heat sealing and fixing of the edge sealing portion 1131.

[0193] With such an arrangement, the edge sealing portion 1131 can be heat-sealed and fixed.

[0194] In some embodiments, referring to FIG. 14 and in combination with other drawings, the edge sealing device 2100 includes a heating element 2120 .

[0195] With this arrangement, when the edge sealing device 2100 heats the edge sealing portion 1131 at the same end of the electrode assembly 11, the heating element 2120 of the edge sealing device 2100 can be brought into contact with the edge sealing portion 1131 at the same end of the electrode assembly 11. In this way, the edge sealing portion 1131 at the same end of the electrode assembly 11 can be heated and fixed to form a fixed region m, that is, the fixed regions m at the same end of the electrode assembly 11 are continuously arranged.

[0196] Alternatively, in other embodiments, please refer to FIG. 15 and other drawings. The edge sealing device 2100 includes a plurality of heating elements 2120 , which are spaced apart and disposed on one side of the connecting element 2110 .

[0197] With this arrangement, when the edge sealing device 2100 heats the edge sealing portion 1131 at the same end of the electrode assembly 11, the multiple spaced-apart heating elements 2120 of the edge sealing device 2100 can contact the edge sealing portion 1131 at the same end of the electrode assembly 11. Each heating element 2120 can heat and fix the edge sealing portion 1131 to form a fixed region m. In this way, the edge sealing portion 1131 at the same end of the electrode assembly 11 can be heated and fixed to form multiple spaced-apart fixed regions m, that is, the fixed regions m at the same end of the electrode assembly 11 are spaced apart.

[0198] It should be noted here that when heat sealing the edge sealing portion 1131, the edge sealing portion 1131 at the same end of the electrode assembly 11 can be heat sealed and fixed by one edge sealing device 2100, or the edge sealing portion 1131 at the same end of the electrode assembly 11 can be heat sealed and fixed by multiple edge sealing devices 2100.

[0199] As an example, as shown in Figure 12, two edge sealing devices 2100 can be respectively located on opposite sides of the electrode assembly 11 along the second direction Y, so that the two edge sealing devices 2100 respectively heat seal the edge sealing portion 1131 at the same end of the electrode assembly 11 on opposite sides of the second direction Y, so that the edge sealing portion 1131 can be located in the middle position of the electrode assembly 11 along the second direction Y after heat sealing and fixation.

[0200] It should be noted that after the positive electrode sheet 111 , the negative electrode sheet 112 and the separator 113 are stacked or wound to form the electrode assembly 11 , the edge sealing portion 1131 of the separator 113 is heat-sealed and fixed by the edge sealing device 2100 .

[0201] In some embodiments, referring to FIG. 13 and in conjunction with other figures, the battery processing apparatus 2000 further includes an assembly device 2200 and a stacking device 2300 . The assembly device 2200 is used to assemble the electrode assembly 11 to form a battery cell 10 . The stacking device 2300 is used to stack multiple battery cells 10 to form a battery 100 .

[0202] The assembling device 2200 is a device for assembling the electrode assembly 11 to form a battery cell 10 , and the stacking device 2300 is a device for stacking a plurality of battery cells 10 to form a battery 100 .

[0203] It can be understood that when the battery processing equipment 2000 is working, the edge sealing portion 1131 of the electrode assembly 11 can be heat-sealed and fixed by the edge sealing device 2100; then, the electrode assembly 11, the shell 121, the end cover 122, etc. are assembled to form a battery cell 10 by the assembly device 2200; finally, multiple battery cells 10 are stacked to form a battery 100 by the stacking device 2300.

[0204] With such configuration, the battery 100 can be obtained.

[0205] In some embodiments, please continue to refer to FIG. 13 and other figures. The battery processing equipment 2000 may further include a winding device 2400 , which is a device for winding the positive electrode sheet 111 , the negative electrode sheet 112 , and the separator 113 to form the electrode assembly 11 .

[0206] Specifically, the winding device 2400 winds the positive electrode sheet 111 , the negative electrode sheet 112 and the separator 113 , thereby obtaining the electrode assembly 11 having a wound structure.

[0207] Please refer to Figure 16 in conjunction with other accompanying drawings. Figure 16 is a flow chart of a method for processing a battery 100 provided in some embodiments of the present application. The method for processing a battery 100 provided in the embodiments of the present application is applied to a battery cell 10. It can be understood that the method for processing a battery 100 is used to process a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0208] The battery 100 processing method provided in the present application includes the following steps:

[0209] S10 , fixing and connecting at least a portion of the edge sealing portion 1131 of the separator 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112 .

[0210] The battery 100 processing method provided in the embodiment of the present application fixes at least a portion of the edge sealing portion 1131 of the diaphragm 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, so that at least a portion of the diaphragm 113 is fixedly connected to the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, thereby fixing the position of at least a portion of the diaphragm 113 to a certain extent. In this way, the diaphragm 113 can stably and securely wrap the positive electrode sheet 111 and the negative electrode sheet 112 to isolate the positive electrode sheet 111 and the negative electrode sheet 112, thereby achieving insulation between the positive electrode sheet 111 and the negative electrode sheet 112, thereby improving the problem of overlapping of the positive electrode sheet 111 and the negative electrode sheet 112 due to the folding of the diaphragm 113, thereby improving the reliability of the battery cell 10.

[0211] In some embodiments, step S10 of fixing and connecting at least a portion of the edge sealing portion 1131 of the separator 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112 includes the following steps:

[0212] S11 , fixing and connecting the edge sealing portion 1131 of the separator 113 outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112 .

[0213] As an example, as shown in Figures 4 to 6, 8, and 9, the positive electrode sheet 111 and the negative electrode sheet 112 are each provided with an edge seal 1131 at opposite ends along the first direction Z. Of the edge seals 1131 at the opposite ends, only the edge seal 1131 at one end is fixedly connected; alternatively, the edge seals 1131 at each end are separately fixedly connected.

[0214] As another example, as shown in Figures 7 and 12, edge seals 1131 are provided at opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z, and at opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X. The edge seals 1131 at each of the four ends are individually fixedly connected; alternatively, the edge seals 1131 at some of the ends are individually fixedly connected.

[0215] By fixing the edge sealing portion 1131 outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112, the edge sealing portion 1131 formed by the diaphragm 113 on the opposite sides of any positive electrode sheet 111 at the same end of the electrode assembly 11 is fixedly connected, thereby wrapping the positive electrode sheet 111. In addition, the edge sealing portion 1131 formed by the diaphragm 113 on the opposite sides of any negative electrode sheet 112 is fixedly connected, thereby wrapping the negative electrode sheet 112. In this way, the edge sealing portion 1131 at each end can wrap the positive electrode sheet 111 and the negative electrode sheet 112 at the corresponding end, so that the diaphragm 113 can stably achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112, thereby improving the problem of overlapping the positive electrode sheet 111 and the negative electrode sheet 112 at the corresponding end.

[0216] In some embodiments, step S11 of fixing and connecting the edge sealing portion 1131 of the separator 113 outside the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112 includes the following steps:

[0217] S111, pressing the edge sealing device 2100 onto the edge sealing portion 1131 of the separator 113 that extends beyond the edge of the same end of the positive electrode sheet 111 and the negative electrode sheet 112;

[0218] Specifically, in this step, the heating element 2120 of the edge sealing device 2100 is pressed onto the edge sealing portion 1131 of the diaphragm 113 .

[0219] S112 , the edge sealing device 2100 heats the edge sealing portion 1131 .

[0220] Specifically, in this step, the heating element 2120 is used to heat the edge sealing portion 1131 so that the edge sealing portion 1131 is melted and fixed.

[0221] By adopting the above technical solution, the edge sealing portion 1131 is fixed by heat sealing.

[0222] In some embodiments, before step S10 of fixing and connecting at least a portion of the edge sealing portion 1131 of the separator 113 that extends beyond the edge of the positive electrode sheet 111 and the edge of the negative electrode sheet 112, the following steps are included:

[0223] S20 , stacking or winding the positive electrode sheet 111 , the negative electrode sheet 112 and the separator 113 .

[0224] It is understood that the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are first stacked to form the electrode assembly 11 having a stacked structure; alternatively, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are first wound to form the electrode assembly 11 having a wound structure. The edge sealing device 2100 then secures the edge 1131 of the electrode assembly 11.

[0225] In this way, after the positive electrode sheet 111 , the negative electrode sheet 112 and the separator 113 are stacked or wound to form the electrode assembly 11 , the edge sealing portion 1131 is fixed.

[0226] As one embodiment of the present application, as shown in Figures 5, 6, 8, and 9, a battery cell 10 includes an electrode assembly 11, which includes a positive electrode sheet 111, a negative electrode sheet 112, a separator 113, a positive electrode tab 114, and a negative electrode tab 115. The positive electrode sheets 111 and the negative electrode sheets 112 are alternately stacked and wound, with at least a portion of the separator 113 disposed between the positive electrode sheet 111 and the negative electrode sheet 112. The positive electrode tab 114 and the negative electrode tab 115 are respectively disposed at opposite ends of the electrode assembly 11 along a first direction Z, with the positive electrode tab 114 connected to the positive electrode sheet 111 and the negative electrode tab 115 connected to the negative electrode sheet 112. The separator 113 extends beyond the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z to form a sealing edge 1131 , and the sealing edge 1131 outside each end of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z is heat-sealed and fixed.

[0227] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A battery cell (10), wherein, It includes an electrode assembly (11), and the electrode assembly (11) includes a positive electrode tab (111), a negative electrode tab (112), and a separator (113). The positive electrode tab (111), the negative electrode tab (112), and the separator (113) are arranged in a stacked or wound manner; a part of the separator (113) extends beyond the edges of the positive electrode tab (111) and the negative electrode tab (112) to form a sealing edge portion (1131), and at least a part of the sealing edge portion (1131) is fixedly connected.

2. The battery cell (10) according to claim 1, wherein, The sealing edge portion (1131) located outside the edges of the positive electrode tab (111) and the negative electrode tab (112) at the same end is fixedly connected.

3. The battery cell (10) according to claim 2, wherein, The sealing edge portion (1131) located outside the edges of the positive electrode tab (111) and the negative electrode tab (112) at the same end is fixedly connected to form a fixed area (m), and the fixed area (m) is arranged at intervals or continuously.

4. The battery cell (10) according to claim 2 or 3, wherein, One end of the electrode assembly (11) along the first direction (Z) is provided with a positive electrode ear (114) and a negative electrode ear (115) at intervals, or the opposite ends of the electrode assembly (11) along the first direction (Z) are respectively provided with a positive electrode ear (114) and a negative electrode ear (115); the positive electrode ear (114) is connected to the positive electrode tab (111), the negative electrode ear (115) is connected to the negative electrode tab (112), and the sealing edge portion (1131) is provided outside at least one end of the positive electrode tab (111) and the negative electrode tab (112) along the first direction (Z).

5. The battery cell (10) according to claim 4, wherein, The sealing edge portion (1131) is provided outside both opposite ends of the positive electrode tab (111) and the negative electrode tab (112) along the first direction (Z), and the sealing edge portion (1131) located outside each end of the positive electrode tab (111) and the negative electrode tab (112) along the first direction (Z) is fixedly connected.

6. The battery cell (10) according to claim 4 or 5, wherein, The positive electrode ear (114) and the negative electrode ear (115) are arranged at intervals at one end of the electrode assembly (11) along the first direction (Z), and the sealing edge portion (1131) is provided outside the end of the positive electrode tab (111) and the negative electrode tab (112) where the positive electrode ear (114) and the negative electrode ear (115) are located; the sealing edge portion (1131) located outside the end of the positive electrode tab (111) and the negative electrode tab (112) where the positive electrode ear (114) and the negative electrode ear (115) are located is fixedly connected and fixed to the positive electrode ear (114) and / or the negative electrode ear (115).

7. The battery cell (10) according to claim 4 or 5, wherein, The positive electrode ear (114) and the negative electrode ear (115) are respectively arranged at the opposite ends of the electrode assembly (11) along the first direction (Z), and the sealing edge portion (1131) is provided outside both opposite ends of the positive electrode tab (111) and the negative electrode tab (112) along the first direction (Z); One end of the positive electrode tab (114) of the positive electrode plate (111) is fixedly connected to the edge sealing portion (1131) outside the end, and is fixed to the positive electrode tab (114); and / or, one end of the negative electrode tab (115) of the positive electrode plate (111) and the negative electrode plate (112) is fixedly connected to the edge sealing portion (1131) outside the end and is fixed to the negative electrode tab (115).

8. The battery cell (10) according to any one of claims 4-7, wherein, The positive electrode plate (111), the negative electrode plate (112) and the separator (113) are stacked along the second direction (Y); at least one end of the positive electrode plate (111) and the negative electrode plate (112) along the third direction (X) is provided with the edge sealing portion (1131); wherein, the first direction (Z), the second direction (Y) and the third direction (X) are mutually intersecting in pairs.

9. The battery cell (10) according to claim 8, wherein, Both ends of the positive electrode plate (111) and the negative electrode plate (112) along the third direction (X) are provided with the edge sealing portion (1131), and the edge sealing portions (1131) located at each end of the positive electrode plate (111) and the negative electrode plate (112) along the third direction (X) are fixedly connected.

10. The battery cell (10) according to any one of claims 1-9, wherein, The edge sealing portion (1131) is fixed by heat sealing; Alternatively, the separator (113) is provided with an adhesive layer at the edge sealing portion (1131), and the edge sealing portion (1131) is fixedly connected through the adhesive layer.

11. A battery (100), wherein, Comprising the battery cell (10) according to any one of claims 1-10.

12. An electrical device, wherein, Comprising the battery cell (10) according to any one of claims 1-10; or, comprising the battery (100) according to claim 11.

13. A battery processing device (2000), wherein, Applied to the battery cell (10) according to any one of claims 1-10; the battery processing device (2000) comprises: An edge sealing device (2100) for fixedly connecting at least a part of the edge sealing portion (1131) of the separator (113) exceeding the edges of the positive electrode plate (111) and the negative electrode plate (112).

14. The battery processing equipment (2000) according to claim 13, wherein, The edge sealing device (2100) comprises: A connecting member (2110); A heating member (2120) arranged on the connecting member (2110) and used for heating the edge sealing portion (1131) to fix the edge sealing portion (1131).

15. The battery processing equipment (2000) according to claim 14, wherein, The edge sealing device (2100) comprises one heating member (2120); or, the edge sealing device (2100) comprises a plurality of heating members (2120), and the plurality of heating members (2120) are arranged at intervals on one side of the connecting member (2110).

16. The battery processing equipment (2000) according to any one of claims 13-15, wherein, The battery processing device (2000) further comprises: An assembling device (2200) for assembling the electrode assembly (11) to form a battery cell (10); A stacking device (2300) for stacking a plurality of the battery cells (10) to form a battery (100).

17. A method for processing a battery (100), wherein, Applied to the battery cell (10) according to any one of claims 1-10; the battery (100) processing method comprises: Fix and connect at least a part of the edge sealing part (1131) of the separator (113) that extends beyond the edges of the positive electrode plate (111) and the negative electrode plate (112).

18. The method for processing the battery (100) according to claim 17, wherein, The step of fixing and connecting at least a part of the edge sealing part (1131) of the separator (113) that extends beyond the edges of the positive electrode plate (111) and the negative electrode plate (112) includes: Fix and connect the edge sealing part (1131) of the separator (113) that extends beyond the edges of the positive electrode plate (111) and the negative electrode plate (112) at the same end of the positive electrode plate (111) and the negative electrode plate (112).

19. The method for processing the battery (100) according to claim 18, wherein, The step of fixing and connecting the edge sealing part (1131) of the separator (113) that extends beyond the edges of the positive electrode plate (111) and the negative electrode plate (112) at the same end of the positive electrode plate (111) and the negative electrode plate (112) includes: Press the edge sealing device (2100) on the edge sealing part (1131) of the separator (113) that extends beyond the edges of the positive electrode plate (111) and the negative electrode plate (112) at the same end; The edge sealing device (2100) heats the edge sealing part (1131).

20. The method for processing a battery (100) according to any one of claims 17-19, wherein, Before the step of fixing and connecting at least a part of the edge sealing part (1131) of the separator (113) that extends beyond the edges of the positive electrode plate (111) and the negative electrode plate (112), it includes: Stack or wind the positive electrode plate (111), the negative electrode plate (112) and the separator (113).

Images