Battery cells, battery devices and power-consuming devices

Abstract

The present application provides a battery cell, a battery device and an electric device. The battery cell includes an electrode assembly, the electrode assembly includes a first pole piece, the first pole piece includes a first body and a plurality of first pole ears, the first pole ear is connected to one end of the first body along the first direction, and the plurality of first pole ears are arranged at equal intervals along the winding direction of the first pole piece; all the first pole ears are stacked along the second direction and form a first common stacking area, in a projection plane perpendicular to the second direction, the orthographic projections of the areas of any two first pole ears located in the first common stacking area overlap, in the first common stacking area, two adjacent first pole ears are connected, in the projection plane perpendicular to the second direction, the ratio of the orthographic projection area of ​​the first common stacking area to the orthographic projection area of ​​any first pole ear is greater than or equal to 0.5, which is conducive to uniform current density distribution and better firmness of connection between each first pole ear and connection between each stacked first pole ear and electrode lead-out portion.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] Batteries are widely used in new energy vehicles, electronic equipment and other fields. As the demand for batteries increases, higher requirements are placed on battery reliability. As the market's requirements for battery life increase, the requirements for battery reliability are also increasing. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, wherein the battery cell includes an electrode assembly, wherein the electrode assembly is a winding structure, wherein the electrode assembly includes a first pole sheet, wherein the first pole sheet includes a first main body and a plurality of first pole ears, wherein the first pole ears are connected to one end of the first main body along a first direction, and the plurality of first pole ears are arranged at equal intervals along the winding direction of the first pole sheet; all the first pole ears are stacked along a second direction and form a first common stacking area, and in a projection plane perpendicular to the second direction, the orthographic projections of areas where any two of the first pole ears are located in the first common stacking area overlap, and the first direction and the second direction intersect, and in the first common stacking area, two adjacent first pole ears are connected; in a projection plane perpendicular to the second direction, the ratio of an area of ​​an orthographic projection of the first common stacking area to an area of ​​an orthographic projection of any of the first pole ears is greater than or equal to 0.5.

[0005] In the above technical solution, multiple first pole ears are arranged at equal intervals along the winding direction of the first pole sheet, which is conducive to uniform current density distribution, reducing the risk of lithium deposition in the battery cell, and improving the reliability of the battery cell. All first pole ears are stacked along the second direction to form a first common stacking area. In the projection plane perpendicular to the second direction, the orthographic projections of the area where any two first pole ears are located in the first common stacking area overlap, which reduces the degree of misalignment between the first pole ears after winding, facilitates the connection between the first pole ears, improves the connection firmness, and is also conducive to aligning the connection equipment with the stacked multiple first pole ears and electrode lead-out parts (such as current collecting components), thereby improving the connection firmness of the stacked multiple first pole ears and electrode lead-out parts, reducing the risk of detachment, and thus helping to improve the reliability of the battery cell. All first pole ears are stacked along the second direction to form a first common stacking area. In the projection plane perpendicular to the second direction, the orthographic projections of the area where any two first pole ears are located in the first common stacking area overlap. In the first common stacking area, two adjacent first pole ears are connected, which is also conducive to improving the current capacity after the multiple first pole ears are stacked and connected, thereby improving the charging speed of the battery cell. Therefore, in this solution, multiple first pole tabs are arranged at equal intervals along the winding direction of the first pole sheet, and all the first pole tabs are stacked along the second direction to form a first common stacking area. In the projection plane perpendicular to the second direction, the orthographic projections of the areas of any two first pole tabs located in the first common stacking area overlap, so that the current distribution is uniform, the risk of lithium deposition in the battery cell is reduced, and the connection between each first pole tab and the connection between each stacked first pole tab and the electrode lead-out portion is better, thereby improving the reliability of the battery cell, and it is also beneficial to improve the current capacity after the multiple first pole tabs are stacked and connected, thereby improving the charging speed of the battery cell. In the projection plane perpendicular to the second direction, the ratio of the orthographic projection area of ​​the first common stacking area to the orthographic projection area of ​​any first pole tab is greater than or equal to 0.5, so that the connection area between each first pole tab is larger, and the connection stability between each first pole tab and the connection stability between the stacked multiple first pole tabs and the electrode lead-out portion is further improved, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0006] In some embodiments of the first aspect of the present application, along the winding direction of the first pole piece, each of the first pole ears has a first end and a second end, the first end is farther away from the winding starting end of the first pole piece than the second end, and the distance from the first ends of multiple first pole ears to the first common stacking area gradually increases from both sides to the middle in the second direction.

[0007] In the above technical scheme, since the circumference of the coil layer of the first pole piece wound close to the winding axis is smaller than the circumference of the coil layer far away from the winding axis, the distance from the first end of the winding starting end of the first pole piece farther away from the first pole piece along the winding direction to the first common stacking area gradually increases from both sides to the middle in the second direction, which is convenient for arranging the adjacent first pole ears along the winding direction with equal spacing, which is beneficial to uniform current density distribution, reducing the risk of lithium plating, and improving the reliability of battery cells.

[0008] In some embodiments of the first aspect of the present application, the distance from the second ends of the plurality of first electrode tabs to the first common stacking region gradually decreases from both sides to the middle in the second direction.

[0009] In the above technical scheme, the distance from the first end of the plurality of first pole ears which is farther away from the winding starting end of the first pole sheet along the winding direction to the first common stacking area gradually increases from both sides to the middle in the second direction, and the distance from the second end of the plurality of first pole ears which is closer to the winding starting end of the first pole sheet along the winding direction to the first common stacking area gradually decreases from both sides to the middle in the second direction, which facilitates the realization of equal width of each first pole ear along the winding direction and equal spacing between adjacent first pole ears, which is beneficial to uniform current density distribution, reduces the risk of lithium plating, improves the reliability of battery cells, reduces the process difficulty, and facilitates the manufacturing and forming of the first pole sheet.

[0010] In some embodiments of the first aspect of the present application, along the winding direction of the first pole piece, the sizes of the plurality of first pole ears are equal.

[0011] In the above technical solution, along the winding direction of the first pole piece, the sizes of the plurality of first pole ears are equal, which can reduce the difficulty of the process and facilitate the manufacturing and forming of the first pole piece.

[0012] In some embodiments of the first aspect of the present application, the difference in distances from the second ends of two adjacent first electrode tabs to the first common stacking region is less than or equal to 2 mm.

[0013] In the above technical solution, the difference in the distances from the second ends of two adjacent first pole ears to the first common stacking area is less than or equal to 2 mm, so that after winding, the degree of misalignment between adjacent first pole ears is small, so that the area where the first pole ears are located outside the first common stacking area is smaller, and conversely, the area where the first pole ears are located in the first common stacking area is larger, which can not only reduce the area where the first pole ears are not involved in the connection, but also make the connection area between each first pole ear large enough, which is beneficial to improve the connection stability between each first pole ear and the connection stability between multiple first pole ears and electrode lead-out parts after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0014] In some embodiments of the first aspect of the present application, a difference in distances from the first ends of two adjacent first electrode tabs to the first common stacking region is less than or equal to 2 mm.

[0015] In the above technical solution, the difference in the distances from the first ends of two adjacent first pole ears to the first common stacking area is less than or equal to 2 mm, so that after winding, the misalignment between the two adjacent first pole ears is small, so that the area where the first pole ears are located outside the first common stacking area is smaller, and conversely, the area where the first pole ears are located in the first common stacking area is larger, which can not only reduce the area where the first pole ears are not involved in the connection, but also make the connection area between each first pole ear large enough, which is beneficial to improve the connection stability between each first pole ear and the connection stability between multiple first pole ears and the electrode lead-out portion after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0016] In some embodiments of the first aspect of the present application, the plurality of first pole ears include a plurality of intermediate pole ears and two edge pole ears, the two edge pole ears are the two first pole ears that are farthest apart, the first pole ear located between the two edge pole ears is the intermediate pole ear, and along the opposite direction of the winding direction of the first pole sheet, the edge pole ear exceeds the second end of the intermediate pole ear, and the second ends of the plurality of intermediate pole ears are flush.

[0017] In the above technical solution, the two edge pole ears that are farthest apart extend beyond the second end of the middle pole ear in the opposite direction of the winding direction of the first pole sheet, and the second ends of the multiple middle pole ears are flush, which is beneficial to increasing the area of ​​the first common stacking region, improving the connection stability between the various first pole ears and the connection stability between the multiple first pole ears and the electrode lead-out parts after stacking, making the internal structure of the battery more stable and improving the reliability of the battery cell.

[0018] In some embodiments of the first aspect of the present application, the distance that the edge tab extends beyond the second end of the middle tab is less than or equal to 2 mm.

[0019] In the above technical solution, the distance that the edge pole ear exceeds the second end of the middle pole ear is less than or equal to 2 mm, so that after winding, the degree of misalignment between the edge pole ear and the middle pole ear is small, so that the area where the edge pole ear is located outside the first common stacking area is smaller, and conversely, the area where the edge pole ear is located in the first common stacking area is larger, which can not only reduce the area where the edge pole ear is not involved in the connection, but also make the connection area between each first pole ear large enough, which is beneficial to improve the connection stability between each first pole ear and the connection stability between multiple first pole ears and electrode lead-out parts after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0020] In some embodiments of the first aspect of the present application, the plurality of first pole tabs include two edge pole tabs, the two edge pole tabs are the two first pole tabs farthest apart, and the first ends of the two edge pole tabs are flush with an edge of the first common stacking region.

[0021] In the above technical solution, the first ends of the two edge pole ears are flush with the edge of the first common stacking area, and one end of the edge pole ear is located outside the first common stacking area, which is convenient for equidistant arrangement of two adjacent first pole ears along the winding direction, and also makes the structure of multiple first pole ears more regular after stacking, which is convenient for connecting multiple first pole ears and connecting multiple first pole ears after stacking with the electrode lead-out part.

[0022] In some embodiments of the first aspect, along the winding direction of the first pole sheet, each of the first pole ears has a first end and a second end, and the first end is farther away from the winding starting end of the first pole sheet than the second end; the multiple first pole ears include a separating pole ear, a first side pole ear and a second side pole ear, and the first side pole ear and the second side pole ear are respectively located on both sides of the separating pole ear in the second direction, and the separating pole ear exceeds the first end of the first side pole ear and the first end of the second side pole ear along the winding direction of the first pole sheet, and the first end of the first side pole ear and the first end of the second side pole ear are flush.

[0023] In the above technical solution, the separating pole ear exceeds the first end of the first side pole ear and the first end of the second side pole ear along the winding direction of the first pole sheet, and the first end of the first side pole ear is flush with the first end of the second side pole ear, which is beneficial to increase the area of ​​the first common stacking region, improve the connection stability between each first pole ear and the connection stability between the multiple first pole ears and the electrode lead-out parts after stacking, make the internal structure of the battery more stable, improve the reliability of the battery cell, and also help to improve the current carrying capacity of the first common stacking region.

[0024] In some embodiments of the first aspect of the present application, there are multiple first side tabs and / or multiple second side tabs.

[0025] In the above technical solution, there are multiple first side pole ears and / or second side pole ears, so that the number of first pole ears is large, which is conducive to improving the current capacity and charging speed, and making the current distribution more uniform, reducing the risk of lithium plating in the battery cell, and improving the reliability of the battery cell.

[0026] In some embodiments of the first aspect of the present application, the distance from the second ends of the plurality of first electrode tabs to the first common stacking region gradually decreases from both sides to the middle in the second direction.

[0027] In the above technical solution, the separating pole ear exceeds the first end of the first side pole ear and the first end of the second side pole ear in the opposite direction of the winding direction of the first pole sheet, the first end of the first side pole ear is flush with the first end of the second side pole ear, and the distance from the second ends of the multiple first pole ears to the first common stacking area gradually decreases from both sides to the middle in the second direction, which is conducive to achieving equal spacing between adjacent first pole ears, and is conducive to increasing the area of ​​the first common stacking area, improving the connection stability between each first pole ear and the connection stability between the multiple first pole ears and the electrode lead-out portion after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0028] In some embodiments, the distance that the separating pole tab extends beyond the first end of the first side pole tab along the winding direction of the first pole piece is less than or equal to 2 mm, and the distance that the separating pole tab extends beyond the first end of the second side pole tab along the winding direction of the first pole piece is less than or equal to 2 mm.

[0029] In the above technical solution, the distance that the separating pole ear exceeds the first end of the first side pole ear along the winding direction of the first pole sheet is less than or equal to 2 mm, and the distance that the separating pole ear exceeds the first end of the second side pole ear along the winding direction of the first pole sheet is less than or equal to 2 mm, so that after winding, the degree of misalignment between the separating pole ear, the first side pole ear and the second side pole ear is small, so that the area where the first pole ear is located outside the first common stacking area is smaller, and conversely, the area where the first pole ear is located in the first common stacking area is larger, which can not only reduce the area where the first pole ear is not involved in the connection, but also make the connection area between each first pole ear large enough, which is beneficial to improve the connection stability between each first pole ear and the connection stability between multiple first pole ears and electrode lead-out parts after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0030] In some embodiments of the first aspect of the present application, the first end of the first side tab and the first end of the second side tab are both flush with the edge of the first common stacking region, and the second end of the partition tab is flush with the edge of the first common stacking region.

[0031] In the above technical solution, the first end of the first side pole ear and the first end of the second side pole ear are both flush with the edge of the first common stacking area, and the second end of the separating pole ear is flush with the edge of the first common stacking area. Then, only one end of the first side pole ear, the second side pole ear and the separating pole ear is located outside the first common stacking area, which is convenient for equidistant arrangement of two adjacent first pole ears along the winding direction, and also makes the structure of multiple first pole ears more regular after stacking, which is convenient for connecting multiple first pole ears and connecting multiple first pole ears after stacking with the electrode lead-out portion.

[0032] In some embodiments of the first aspect of the present application, the electrode assembly also includes a second pole piece, the second pole piece has opposite polarity to the first pole piece, the second pole piece includes a second body and a plurality of second pole ears, the second pole ear is connected to one end of the second body along the first direction, and the plurality of second pole ears are arranged at equal intervals along the winding direction of the second pole piece; all the second pole ears are stacked along a third direction and form a second common stacking area, and in a projection plane perpendicular to the third direction, the orthographic projections of any two of the second pole ears located in the second common stacking area overlap, the first direction and the third direction intersect, and in the second common stacking area, two adjacent second pole ears are connected.

[0033] In the above technical solution, multiple second pole ears are arranged at equal intervals along the winding direction of the second pole sheet, which is conducive to uniform current density distribution, reducing the risk of lithium deposition in the battery cell, and improving the reliability of the battery cell. All second pole ears are stacked along the third direction to form a second common stacking area. In the projection plane perpendicular to the third direction, the orthographic projections of the area where any two second pole ears are located in the second common stacking area overlap, which reduces the degree of misalignment between the second pole ears after winding, facilitates the connection between the second pole ears, improves the connection firmness, and is also conducive to aligning the connection equipment with the stacked multiple second pole ears and electrode lead-out parts (such as current collecting components), thereby improving the connection firmness of the stacked multiple second pole ears and electrode lead-out parts, reducing the risk of detachment, and thus helping to improve the reliability of the battery cell. All second pole ears are stacked along the third direction to form a second common stacking area. In the projection plane perpendicular to the third direction, the orthographic projections of the area where any two second pole ears are located in the second common stacking area overlap. In the second common stacking area, two adjacent second pole ears are connected, which is also conducive to improving the current capacity after the multiple second pole ears are stacked and connected, thereby improving the charging speed of the battery cell. Therefore, in this scheme, by equidistantly arranging a plurality of second pole ears along the winding direction of the second pole sheet, and stacking all the second pole ears along the third direction to form a second common stacking area, in the projection plane perpendicular to the third direction, the orthographic projections of the area where any two second pole ears are located in the second common stacking area overlap, thereby making the current distribution uniform, thereby further reducing the risk of lithium deposition in the battery cell, and making the connection between the respective second pole ears and the connection between the stacked second pole ears and the electrode lead-out portion more secure, thereby improving the reliability of the battery cell, and also being beneficial to improving the current carrying capacity after the plurality of second pole ears are stacked and connected, thereby further improving the charging speed of the battery cell.

[0034] In some embodiments of the first aspect of the present application, in a projection plane perpendicular to the third direction, a ratio of an area of ​​an orthographic projection of the second common stacking region to an area of ​​an orthographic projection of any second pole tab is greater than or equal to 0.5.

[0035] In the above technical solution, in the projection plane perpendicular to the third direction, the ratio of the area of ​​the orthographic projection of the second common stacking region to the area of ​​the orthographic projection of any second pole ear is greater than or equal to 0.5, so that the connection area between each second pole ear is larger, and the connection stability between each second pole ear and the connection stability between the stacked multiple second pole ears and the electrode lead-out portion are further improved, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0036] In a second aspect, an embodiment of the present application provides a battery device, comprising a battery cell provided by any of the above embodiments.

[0037] In the above technical solution, the battery cell provided by any of the above embodiments has good reliability, and the battery device equipped with the battery cell also has good reliability.

[0038] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any of the above embodiments or a battery device provided by the above embodiments.

[0039] In the above technical solutions, the battery cells and battery devices provided in any of the above embodiments have good reliability, so that the power consumption reliability of the power-consuming device powered by the battery cells or battery devices is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0042] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0043] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0044] Figure 4 An axonometric view of a battery cell provided for some embodiments of the present application;

[0045] Figure 5 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0046] Figure 6 To observe along the second direction Figure 5A view of a plurality of first pole ears in FIG. 1 (the dotted lines are the first and second ends of the first pole ears that are blocked);

[0047] Figure 7 for Figure 5 A view of a plurality of first tabs of the middle electrode assembly observed along a first direction;

[0048] Figure 8 A schematic diagram of the structure of an electrode assembly provided in some other embodiments of the present application;

[0049] Fig. 9 for Figure 8 A view of a plurality of first tabs of the middle electrode assembly observed along a first direction;

[0050] Fig.10 A schematic diagram of the structure of an electrode assembly provided in some further embodiments of the present application;

[0051] Fig.11 for Fig.10 A view of a plurality of first tabs of the middle electrode assembly observed along a first direction;

[0052] Fig.12 A schematic diagram of the structure of an electrode assembly provided in some other embodiments of the present application;

[0053] Fig.13 for Fig.12 A view of a plurality of first tabs of the middle electrode assembly observed along a first direction;

[0054] Fig.14 A schematic diagram of the structure of an electrode assembly provided in yet other embodiments of the present application;

[0055] Fig.15 for Fig.14 A view of a plurality of first tabs of the middle electrode assembly observed along a first direction;

[0056] Fig.16 A schematic diagram of the structure of an electrode assembly provided in some other embodiments of the present application;

[0057] Fig.17 To observe along the second direction Figure 5 A view of a plurality of second pole ears in FIG. 1 (the dotted lines are the third and fourth ends of the second pole ears that are blocked);

[0058] Fig.18 for Fig.16 A view of a plurality of second tabs of the middle electrode assembly viewed along a first direction.

[0059] Icon: 1000-vehicle; 100-battery device; 10-box; 11-first box; 12-second box; 20-battery cell; 21-housing; 211-shell; 2111-opening; 212-end cover; 22-electrode assembly; 22a-straight area; 22b-bending area; 22c-winding center hole; 221-first pole piece; 2211-first body; 2212-first pole ear; 22121-first end; 22122-second end; 22123-middle pole ear; 22124-edge pole ear; 22125-middle Inter-pole ear; 22126-separating pole ear; 22127-first side pole ear; 22128-second side pole ear; 222-second pole piece; 2221-second body; 2222-second pole ear; 22221-third end; 22222-fourth end; 223-isolating membrane; Q1-first common stacking region; Q2-second common stacking region; 23-electrode terminal; 200-controller; 300-motor; X-first direction; Y-second direction; Y'-third direction; Z-fourth direction; K-winding direction; A1-first side; A2-second side. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0062] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0063] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0066] The term “plurality” used in this application refers to two or more (including two).

[0067] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0068] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0069] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0070] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0071] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0072] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and its modified compounds, etc.

[0074] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0075] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0076] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0078] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0080] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0081] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0082] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0084] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0085] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0086] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0087] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0088] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0089] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0090] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0091] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0092] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0093] As an example, the separator may be disposed continuously and disposed between any adjacent positive electrode sheets or negative electrode sheets by winding.

[0094] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0095] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0096] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0097] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0098] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0099] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0100] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0101] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0102] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0103] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0104] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0105] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0106] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0107] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0108] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, the reliability of the battery must also be considered.

[0109] For battery cells with a wound electrode assembly, the uneven current density distribution inside the battery cells will increase the risk of lithium plating, reducing the reliability of the battery cells; and during the winding process, the pole ears are seriously misaligned, resulting in reduced connection strength between the pole ears and between the stacked pole ears and the electrode lead-out parts, thereby further reducing the reliability of the battery cells.

[0110] Based on the above considerations, in order to alleviate the problem of reduced reliability of battery cells caused by uneven current density distribution and serious misalignment of pole ears, an embodiment of the present application provides a battery cell, wherein the battery cell includes an electrode assembly, the electrode assembly is a winding structure, the electrode assembly includes a first pole sheet, the first pole sheet includes a first main body and a plurality of first pole ears, the first pole ear is connected to one end of the first main body along a first direction, and the plurality of first pole ears are arranged at equal intervals along the winding direction of the first pole sheet; all the first pole ears are stacked along the second direction and form a first common stacking area, and in a projection plane perpendicular to the second direction, the orthographic projections of the areas where any two first pole ears are located in the first common stacking area overlap, the first direction and the second direction intersect, and in the first common stacking area, two adjacent first pole ears are connected; in a projection plane perpendicular to the second direction, the ratio of the area of ​​the orthographic projection of the first common stacking area to the area of ​​the orthographic projection of any of the first pole ears is greater than or equal to 0.5.

[0111] Multiple first pole ears are arranged at equal intervals along the winding direction of the first pole sheet, which is conducive to uniform current density distribution, reducing the risk of lithium deposition in the battery cell, and improving the reliability of the battery cell. All first pole ears are stacked along the second direction to form a first common stacking area. In the projection plane perpendicular to the second direction, the orthographic projections of the area where any two first pole ears are located in the first common stacking area overlap, which reduces the degree of misalignment between the first pole ears after winding, facilitates the connection between the first pole ears, improves the connection firmness, and is also conducive to the connection equipment aligning the stacked multiple first pole ears and electrode lead-out parts (such as current collecting components), thereby improving the connection firmness of the stacked multiple first pole ears and electrode lead-out parts, reducing the risk of detachment, and thus helping to improve the reliability of the battery cell. All first pole ears are stacked along the second direction to form a first common stacking area. In the projection plane perpendicular to the second direction, the orthographic projections of the area where any two first pole ears are located in the first common stacking area overlap. In the first common stacking area, two adjacent first pole ears are connected, which is also conducive to improving the current capacity after the multiple first pole ears are stacked and connected, thereby improving the charging speed of the battery cell.

[0112] Therefore, in this solution, multiple first pole tabs are arranged at equal intervals along the winding direction of the first pole sheet, and all the first pole tabs are stacked along the second direction to form a first common stacking area. In the projection plane perpendicular to the second direction, the orthographic projections of the areas of any two first pole tabs located in the first common stacking area overlap, so that the current distribution is uniform, the risk of lithium deposition in the battery cell is reduced, and the connection between each first pole tab and the connection between each stacked first pole tab and the electrode lead-out portion is better, thereby improving the reliability of the battery cell, and it is also beneficial to improve the current capacity after the multiple first pole tabs are stacked and connected, thereby improving the charging speed of the battery cell. In the projection plane perpendicular to the second direction, the ratio of the orthographic projection area of ​​the first common stacking area to the orthographic projection area of ​​any first pole tab is greater than or equal to 0.5, so that the connection area between each first pole tab is larger, and the connection stability between each first pole tab and the connection stability between the stacked multiple first pole tabs and the electrode lead-out portion is further improved, so that the internal structure of the battery is more stable and the reliability of the battery cell is improved.

[0113] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0114] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0115] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100 inside, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000.

[0116] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0117] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0118] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 may include a case 10 and a battery cell 20 . The case 10 is used to accommodate the battery cell 20 .

[0119] Among them, a closed space for accommodating the battery cell 20 is formed inside the box 10. The box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first box 11 and a second box 12, and the first box 11 and the second box 12 are buckled with each other. The first box 11 and the second box 12 can be in various shapes, such as a cuboid, a cylinder, etc. The first box 11 can be a hollow structure with one side open, and the second box 12 can also be a hollow structure with one side open. The open side of the second box 12 is buckled with the open side of the first box 11 to form a box 10 with a closed space. It is also possible that the first box 11 is a hollow structure with one side open, and the second box 12 is a plate-like structure. The second box 12 is buckled on the open side of the first box 11, so as to form a box 10 with a accommodating space.

[0120] In the battery device 100, there may be one or more battery cells 20. If there are more than one battery cell 20, the battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 20 are connected in series and in parallel. A battery module may be formed by connecting a plurality of battery cells 20 in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole and accommodated in the box 10. Alternatively, all the battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 20 is accommodated in the box 10.

[0121] In some embodiments, the battery device 100 may further include a busbar, through which multiple battery cells 20 may be electrically connected to each other, so as to realize series connection, parallel connection or mixed connection of multiple battery cells 20. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0122] Please refer to Figure 3 and Figure 4 , Figure 3 An exploded view of a battery cell 20 provided in some embodiments of the present application; Figure 4 for Figure 3 The battery cell 20 is shown in an isometric view. The battery cell 20 may include a housing 21 and an electrode assembly 22 , wherein the electrode assembly 22 is accommodated in the housing 21 .

[0123] In some embodiments, the housing 21 may include a shell 211 and an end cap 212, wherein the shell 211 has an opening 2111, and the end cap 212 closes the opening 2111 of the shell 211. The closing here means covering or closing, which may be sealed or unsealed.

[0124] The shell 211 is a component for accommodating the electrode assembly 22. The shell 211 may be a hollow structure with an opening 2111 formed at one end, or a hollow structure with openings 2111 formed at opposite ends. The shell 211 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The material of the shell 211 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 22 may be partially located in the shell 211, or may be completely located in the shell 211.

[0125] The end cap 212 and the shell 211 together define a receiving space for accommodating the electrode assembly 22 and other components. The end cap 212 can be connected to the shell 211 by welding, crimping, etc. to close the opening 2111 of the shell 211. The shape of the end cap 212 can be adapted to the shape of the shell 211. For example, the shell 211 is a rectangular parallelepiped structure, and the end cap 212 is a rectangular plate structure adapted to the shell 211. For another example, the shell 211 is a cylindrical structure, and the end cap 212 is a circular plate structure adapted to the shell 211. The material of the end cap 212 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 and the shell 211 can be the same or different.

[0126] In the embodiment where the housing 211 forms an opening 2111 at one end, one end cap 212 may be provided accordingly. In the embodiment where the housing 211 forms openings 2111 at two opposite ends, two end caps 212 may be provided accordingly, and the two end caps 212 respectively close the two openings 2111 of the housing 211, and the two end caps 212 and the housing 211 together define a receiving space.

[0127] In some embodiments, the battery cell 20 may further include an electrode terminal 23, which is disposed on the housing 21, and the electrode terminal 23 is used to electrically connect to the tab of the electrode assembly 22 to input or output the electrical energy of the battery cell 20. The electrode terminal 23 may be disposed on the shell 211 of the housing 21, or may be disposed on the end cover 212 of the housing 21. The electrode terminal 23 may be directly connected to the tab, for example, the electrode terminal 23 is welded to the tab. The electrode terminal 23 may also be indirectly connected to the tab, for example, the electrode terminal 23 is indirectly connected to the tab through a current collecting member. The current collecting member may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0128] As an example, Figure 3 and Figure 4As shown, an opening 2111 is formed at one end of the shell 211, and there is one end cap 212 in the shell 21, and one end cap 212 closes one opening 2111 of the shell 211. Two electrode terminals 23 are provided on the end cap 212, and the two electrode terminals 23 are respectively a positive electrode terminal 23 and a negative electrode terminal 23. A positive electrode tab and a negative electrode tab are formed at one end of the electrode assembly 22 facing the end cap 212, and the positive electrode terminal 23 is electrically connected to the positive electrode tab, and the negative electrode terminal 23 is electrically connected to the negative electrode tab.

[0129] Combined with reference Figure 3 , Figure 4 and Figure 5 , Figure 5 A schematic diagram of the structure of an electrode assembly 22 provided in some embodiments of the present application. The embodiment of the present application provides a battery cell 20, the battery cell 20 includes an electrode assembly 22, the electrode assembly 22 is a winding structure, the electrode assembly 22 includes a first pole piece 221, the first pole piece 221 includes a first main body 2211 and a plurality of first pole ears 2212, the first pole ear 2212 is connected to one end of the first main body 2211 along the first direction X, and the plurality of first pole ears 2212 are arranged at equal intervals along the winding direction K of the first pole piece 221; all the first pole ears 2212 are stacked along the second direction Y and form a first common stacking area Q1, in a projection plane perpendicular to the second direction Y, the orthographic projections of any two first pole ears 2212 located in the first common stacking area Q1 overlap, the first direction X and the second direction Y intersect, and in the first common stacking area Q1, two adjacent first pole ears 2212 are connected.

[0130] The electrode assembly 22 includes a positive electrode sheet, a negative electrode sheet and a separator 223, wherein the separator 223 is used to insulate and separate the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the negative electrode sheet and the separator 223 are stacked in a certain order and wound around a winding axis to form a wound electrode assembly 22. Figure 5 As shown, the electrode assembly 22 includes a straight area 22a and two bending areas 22b, and the two bending areas 22b are respectively connected to the two ends of the straight area 22a in the fourth direction Z to form a flat electrode assembly 22. The fourth direction Z is perpendicular to the extension direction of the winding axis of the electrode assembly 22.

[0131] In other embodiments, the electrode assembly 22 may also be a cylindrical structure.

[0132] The positive electrode sheet includes a positive current collecting layer, a positive active material layer and a positive electrode ear. Along the thickness direction of the positive electrode sheet, at least one side of the positive current collecting layer is provided with a positive active material layer. The positive electrode ear is connected to one end of the positive electrode ear along the width direction of the positive electrode sheet, and the positive electrode ear and the positive current collecting layer together form the positive current collector of the positive electrode sheet. The positive current collecting layer and the positive electrode ear can be integrally formed, for example, by die-cutting the same current collector to form an integral positive current collecting layer and positive electrode ear, which is convenient for the manufacturing and forming of the positive electrode sheet and is conducive to improving production efficiency.

[0133] The positive electrode current collecting layer and the positive electrode tab may also be separate structures. For example, different current collectors are die-cut separately to form separate positive electrode current collecting layer and positive electrode tab, and then the positive electrode current collecting layer and the positive electrode tab are connected as one through conductive glue, welding and other connection methods to form the positive electrode current collector of the positive electrode sheet, making the structural setting of the positive electrode current collector more flexible.

[0134] The positive electrode sheet includes a plurality of positive electrode tabs, which are arranged at intervals along the winding direction of the positive electrode sheet and connected to the same end of the positive current collecting layer along the width direction of the positive electrode sheet.

[0135] In some embodiments, the positive electrode current collector layer and the positive electrode active material layer together form a positive electrode body of the positive electrode sheet.

[0136] The negative electrode sheet includes a negative current collecting layer, a negative active material layer and a negative electrode tab. Along the thickness direction of the negative electrode sheet, at least one side of the negative current collecting layer is provided with a negative active material layer. The negative electrode tab is connected to one end of the negative electrode tab along the negative electrode sheet, and the negative electrode tab and the negative current collecting layer together form a negative current collector of the negative electrode sheet. The negative current collecting layer and the negative electrode tab can be integrally formed, for example, by die-cutting the same current collector to form an integral negative current collecting layer and negative electrode tab, which is convenient for manufacturing and forming the negative electrode sheet and is conducive to improving production efficiency.

[0137] The negative electrode current collecting layer and the negative electrode tab may also be separate structures. For example, different current collectors are die-cut separately to form separate negative electrode current collecting layer and negative electrode tab, and then the negative electrode current collecting layer and the negative electrode tab are connected as one through conductive glue, welding and other connection methods to form the negative electrode current collector of the negative electrode sheet, making the structural setting of the negative electrode current collector more flexible.

[0138] The negative electrode sheet includes a plurality of negative electrode tabs, which are arranged at intervals along the winding direction of the negative electrode sheet and connected to the same end of the negative current collecting layer along the width direction of the negative electrode sheet.

[0139] In some embodiments, the negative electrode current collector layer and the negative electrode active material layer together form the negative electrode body of the negative electrode sheet.

[0140] The winding direction of the negative electrode sheet is the same as the winding direction of the positive electrode sheet. The length direction of the positive electrode sheet corresponds to the winding direction of the positive electrode sheet, and the length direction of the negative electrode sheet corresponds to the winding direction of the negative electrode sheet. The width direction of the positive electrode sheet, the width direction of the negative electrode sheet and the first direction X are all parallel to the extension direction of the winding axis of the electrode assembly 22.

[0141] The first pole piece 221 can be a positive pole piece or a negative pole piece. When the first pole piece 221 is a positive pole piece, the first body 2211 is a positive pole body, and the first pole ear 2212 is a positive pole ear. When the first pole piece 221 is a negative pole piece, the first body 2211 is a negative pole body, and the first pole ear 2212 is a negative pole ear. Figure 5 FIG. 2 shows a case where the first electrode piece 221 is a positive electrode piece.

[0142] like Figure 5 As shown, a plurality of first electrode tabs 2212 are stacked on one side of the winding center hole 22c of the electrode assembly 22 along the second direction Y. The plurality of first electrode tabs 2212 may be located in the straight region 22a or in the same bending region 22b. Figure 5 FIG. 2 shows a situation where a plurality of first pole tabs 2212 are located in the straight region 22 a . After winding is completed, the first pole tabs 2212 are still flat along the winding direction K of the first pole piece 221 , which is convenient for welding.

[0143] The second direction Y may be any direction perpendicular to the extension direction of the winding axis of the electrode assembly 22, and the second direction Y may be perpendicular to the first direction X. Figure 5 As shown, the first direction X, the second direction Y and the fourth direction Z are perpendicular to each other.

[0144] Along the winding direction K of the first pole piece 221, multiple first pole ears 2212 are arranged at equal intervals, wherein the multiple first pole ears 2212 are not arranged at absolutely equal intervals. Due to limitations of production equipment, production process, etc., there may be a certain error in the spacing between some first pole ears 2212. Exemplarily, the allowable error of the spacing difference between adjacent first pole ears 2212 is ±10mm.

[0145] In the first common stacking region Q1 , two adjacent first electrode tabs 2212 may be connected by welding or by bonding with a conductive adhesive.

[0146] The multiple first pole tabs 2212 are arranged at equal intervals along the winding direction K of the first pole sheet 221, which is conducive to uniform current density distribution, reducing the risk of lithium deposition in the battery cell 20, and improving the reliability of the battery cell 20. All the first pole tabs 2212 are stacked along the second direction Y to form a first common stacking area Q1. In the projection plane perpendicular to the second direction Y, the orthographic projections of the areas of any two first pole tabs 2212 located in the first common stacking area Q1 overlap, which reduces the degree of misalignment between the first pole tabs 2212 after winding, facilitates the connection between the first pole tabs 2212, improves the connection firmness, and is also conducive to the connection equipment aligning the stacked multiple first pole tabs 2212 and the electrode lead-out portion (such as the current collecting member), thereby improving the connection firmness between the stacked multiple first pole tabs 2212 and the electrode lead-out portion, reducing the risk of separation, and thus helping to improve the reliability of the battery cell 20. All the first pole ears 2212 are stacked along the second direction Y to form a first common stacking area Q1. In the projection plane perpendicular to the second direction Y, the orthographic projections of any two first pole ears 2212 located in the first common stacking area Q1 overlap. In the first common stacking area Q1, two adjacent first pole ears 2212 are connected, which is also beneficial to improving the current carrying capacity after the multiple first pole ears 2212 are stacked and connected, thereby improving the charging speed of the battery cell 20. Therefore, in this scheme, multiple first pole ears 2212 are arranged at equal intervals along the winding direction K of the first pole sheet 221, and all the first pole ears 2212 are stacked along the second direction Y to form a first common stacking area Q1. In the projection plane perpendicular to the second direction Y, the orthographic projections of the areas where any two first pole ears 2212 are located in the first common stacking area Q1 overlap, so that the current distribution is uniform, the risk of lithium deposition in the battery cell 20 is reduced, and the connection between each first pole ear 2212 and the connection between each stacked first pole ear 2212 and the electrode lead-out portion are more secure, thereby improving the reliability of the battery cell 20, and is also beneficial to improving the current carrying capacity after the multiple first pole ears 2212 are stacked and connected, thereby improving the charging speed of the battery cell 20.

[0147] It should be noted that the aforementioned electrode lead-out portion is a component electrically connected to the electrode assembly 22. If the electrode lead-out portion is connected to the positive electrode tab, the electrode lead-out portion forms the positive electrode of the battery cell 20. If the electrode lead-out portion is connected to the negative electrode tab, the electrode lead-out portion forms the negative electrode of the battery cell 20, and the battery cell 20 can be charged or discharged through the electrode lead-out portion. There are many forms of the electrode lead-out portion, for example, the electrode lead-out portion can be an electrode terminal 23, that is, the electrode terminal 23 is connected to the first common stacking area Q1; for example, the electrode lead-out portion can include a current collecting member and an electrode terminal 23, and the electrode terminal 23 and the first common stacking area Q1 are connected through the current collecting member; for another example, the electrode lead-out portion can be a shell 211, and the first common stacking area Q1 is connected to the shell 211.

[0148] like Figure 6 As shown, in some embodiments, in a projection plane perpendicular to the second direction Y, a ratio of an area of ​​an orthographic projection of the first common stack region Q1 to an area of ​​an orthographic projection of any first pole tab 2212 is greater than or equal to 0.5.

[0149] Exemplarily, the projection area of ​​one of the two first pole ears 2212 farthest apart in the second direction Y in the projection plane perpendicular to the second direction Y is S, and the orthographic projection area of ​​the first common stack region Q1 in the projection plane perpendicular to the second direction Y is S1, S1 / S≥0.5.

[0150] In the projection plane perpendicular to the second direction Y, the ratio of the orthographic projection area of ​​the first common stack region Q1 to the orthographic projection area of ​​any first pole tab 2212 may be 0.5, 0.55, 0.6, 0.65, 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0151] In the projection plane perpendicular to the second direction Y, the ratio of the area of ​​the orthographic projection of the first common stacking region Q1 to the area of ​​the orthographic projection of any first pole ear 2212 is greater than or equal to 0.5, so that the connection area between each first pole ear 2212 is larger, and the connection stability between each first pole ear 2212 and the connection stability between the stacked multiple first pole ears 2212 and the electrode lead-out portion are further improved, so that the internal structure of the battery is more stable and the reliability of the battery cell 20 is improved.

[0152] like Figure 5 , Figure 7-Figure 9 As shown, in some embodiments, along the winding direction K of the first pole piece 221, each first pole ear 2212 has a first end 22121 and a second end 22122, the first end 22121 is farther away from the winding starting end of the first pole piece 221 than the second end 22122, and the distance from the first end 22121 of the plurality of first pole ears 2212 to the first common stacking region Q1 gradually increases from both sides to the middle in the second direction Y.

[0153] The first end 22121 and the second end 22122 are also two opposite ends of the first pole tab 2212 in the width direction. The distance from the first end 22121 of the first pole tab 2212 to the first common stacking region Q1 refers to the distance between the first end 22121 and the first common stacking region Q1 in the direction from the first end 22121 to the second end 22122. The distances from the first ends 22121 of the plurality of first pole tabs 2212 to the first common stacking region Q1 may increase gradually in an equal series from both sides to the middle in the second direction Y, and the distances from the first ends 22121 of the plurality of first pole tabs 2212 to the first common stacking region Q1 may increase gradually in a non-arithmetic series from both sides to the middle in the second direction Y.

[0154] like Figure 5 , Figure 7 As shown, the one of the plurality of first pole tabs 2212 whose first end 22121 is farthest from the first common stacking region Q1 is the middle pole tab 22123, and the middle pole tab 22123 has a first side A1 facing the winding center hole 22c and a second side A2 away from the winding center hole 22c. On the first side A1, of two adjacent first pole tabs 2212, the one close to the middle pole tab 22123 exceeds the first end 22121 of the one far from the middle pole tab 22123 along the direction from the second end 22122 to the first end 22121. On the second side A2, of two adjacent first pole tabs 2212, the one close to the middle pole tab 22123 exceeds the first end 22121 of the one close to the middle pole tab 22123 along the direction from the second end 22122 to the first end 22121.

[0155] At least one of the first ends 22121 of the two first pole tabs 2212 that are farthest apart in the second direction Y among the plurality of first pole tabs 2212 is the first end 22121 closest to the first common stacking region Q1 among all the first ends 22121. It can be understood that at least one of the first ends 22121 of the two first pole tabs 2212 that are farthest apart is flush with the edge of the first common stacking region Q1. Figure 5 , Figure 7-Figure 9 As shown, in some embodiments, the first ends 22121 of the two first pole tabs 2212 that are farthest apart are flush with each other, and the first ends 22121 of the two first pole tabs 2212 that are farthest apart are both flush with the edge of the first common stack region Q1.

[0156] Since the circumference of the coil layer of the first pole piece 221 wound close to the winding axis is smaller than the circumference of the coil layer away from the winding axis, the distance from the first end 22121 of the first pole piece 221 which is farther away from the winding starting end of the first pole piece 221 along the winding direction K to the first common stacking area Q1 gradually increases from both sides to the middle in the second direction Y, which is convenient for arranging the adjacent first pole pieces 2212 along the winding direction K with equal spacing, thereby facilitating uniform current density distribution, reducing the risk of lithium plating, and improving the reliability of the battery cell 20.

[0157] In an embodiment where the distance between the first ends 22121 of the plurality of first tabs 2212 and the first common stacking region Q1 increases gradually from both sides to the middle in the second direction Y, as shown in FIG. Figure 5-Figure 7 As shown, in some embodiments, the distance from the second ends 22122 of the plurality of first electrode tabs 2212 to the first common stacking region Q1 decreases gradually from both sides to the middle in the second direction Y.

[0158] The distance from the second end 22122 of the first pole tab 2212 to the first common stacking region Q1 refers to the distance between the second end 22122 and the first common stacking region Q1 in the direction from the first end 22121 to the second end 22122. The distances from the second ends 22122 of the plurality of first pole tabs 2212 to the first common stacking region Q1 may gradually decrease in an equal series from both sides to the middle in the second direction Y, and the distances from the second ends 22122 of the plurality of first pole tabs 2212 to the first common stacking region Q1 may gradually decrease in a non-arithmetic series from both sides to the middle in the second direction Y.

[0159] On the first side A1, of the two adjacent first pole ears 2212, the one away from the middle pole ear 22123 extends beyond the second end 22122 of the one close to the middle pole ear 22123 along the direction from the first end 22121 to the second end 22122. On the second side A2, of the two adjacent first pole ears 2212, the one away from the middle pole ear 22123 extends beyond the first end 22121 of the one close to the middle pole ear 22123 along the direction from the first end 22121 to the second end 22122.

[0160] The second end 22122 of the middle pole tab 22123 is closest to the first common stacking region Q1. Specifically, the second end 22122 of the middle pole tab 22123 may be flush with the edge of the first common stacking region Q1. It can be understood that the second end 22122 of the middle pole tab 22123 and the first end 22121 of at least one of the two first pole tabs 2212 that are farthest apart are respectively two edges of the first common stacking region Q1. In other words, the first common stacking region Q1 is located between the second end 22122 of the middle pole tab 22123 and the first end 22121 of at least one of the two first pole tabs 2212 that are farthest apart.

[0161] The distance from the first end 22121 of the first pole ears 2212 which is farther away from the winding starting end of the first pole piece 221 along the winding direction K to the first common stacking area Q1 gradually increases from both sides to the middle in the second direction Y, and the distance from the second end 22122 of the first pole ears 2212 which is closer to the winding starting end of the first pole piece 221 along the winding direction K to the first common stacking area Q1 gradually decreases from both sides to the middle in the second direction Y, which facilitates the realization of equal width of each first pole ear 2212 along the winding direction K and equal spacing between adjacent first pole ears 2212, which is beneficial to uniform current density distribution, reduces the risk of lithium plating, improves the reliability of the battery cell 20, and reduces the process difficulty, which facilitates the manufacturing of the first pole piece 221.

[0162] exist Figure 5 , Figure 7 In the embodiment shown in FIG. 2 , along the winding direction K of the first pole piece 221 , the sizes of the plurality of first pole tabs 2212 may be equal or unequal.

[0163] In some embodiments, along the winding direction K of the first pole piece 221 , the sizes of the plurality of first pole tabs 2212 are equal. It can be understood that the plurality of first pole tabs 2212 have the same width. Figure 5 and Figure 7 FIG. 2 shows a situation where the sizes of the plurality of first pole tabs 2212 along the winding direction K of the first pole piece 221 are equal.

[0164] Along the winding direction K of the first pole piece 221 , the sizes of the plurality of first pole tabs 2212 are equal, which can reduce the process difficulty and facilitate the manufacturing and forming of the first pole piece 221 .

[0165] In some embodiments, the difference in distances between the second ends 22122 of two adjacent first electrode tabs 2212 and the first common stacking region Q1 is less than or equal to 2 mm.

[0166] For example, Figure 7 As shown, the distances from the second ends 22122 of two adjacent first pole tabs 2212 to the first common stacking region Q1 are H1 and H2, respectively, and H2-H1≤2mm; the distances from the second ends 22122 of another group of two adjacent first pole tabs 2212 to the first common stacking region Q1 are H3 and H4, respectively, and H4-H3≤2mm. The difference in the distances from the second ends 22122 of any two groups of two adjacent first pole tabs 2212 to the first common stacking region Q1 can be the same or different. For example, Figure 7 In some embodiments, H2-H1= H4-H3. In other embodiments, H2-H1≠ H4-H3.

[0167] The difference in distances from the second ends 22122 of two adjacent first pole ears 2212 to the first common stacking region Q1 can also be equivalent to the distance between the second ends 22122 of two adjacent first pole ears 2212 in the direction from the first end 22121 to the second end 22122, that is, the distance between the second ends 22122 of two adjacent first pole ears 2212 in the direction from the first end 22121 to the second end 22122 is less than or equal to 2 mm.

[0168] The difference in distances from the second ends 22122 of two adjacent first electrode tabs 2212 to the first common stacking region Q1 may be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 2 mm, etc.

[0169] The difference in distances from the second ends 22122 of two adjacent first pole ears 2212 to the first common stacking area Q1 is less than or equal to 2 mm, so that after winding, the misalignment between adjacent first pole ears 2212 is small, so that the area of ​​the first pole ears 2212 outside the first common stacking area Q1 is smaller, and conversely, the area of ​​the first pole ears 2212 located in the first common stacking area Q1 is larger, which can not only reduce the area where the first pole ears 2212 are not involved in the connection, but also make the connection area between each first pole ear 2212 large enough, which is beneficial to improve the connection stability between each first pole ear 2212 and the connection stability between the multiple first pole ears 2212 and the electrode lead-out portion after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell 20 is improved.

[0170] like Figure 5 , Figure 7-Figure 9 As shown, in some embodiments, the difference in distances from the first ends 22121 of two adjacent first electrode tabs 2212 to the first common stacking region Q1 is less than or equal to 2 mm.

[0171] For example, Figure 7 As shown, the distances from the first ends 22121 of two adjacent first pole tabs 2212 to the first common stacking region Q1 are H5 and H6, respectively, and H6-H5≤2mm; the distances from the first ends 22121 of another group of two adjacent first pole tabs 2212 to the first common stacking region Q1 are H7 and H8, respectively, and H8-H7≤2mm. The difference in the distances from the second ends 22122 of any two groups of two adjacent first pole tabs 2212 to the first common stacking region Q1 can be the same or different. Fig. 9 As shown, the distances from the first ends 22121 of two adjacent first pole tabs 2212 to the first common stacking region Q1 are H9 and H10, respectively, and H10-H9≤2mm; the distances from the first ends 22121 of another group of two adjacent first pole tabs 2212 to the first common stacking region Q1 are H11 and H12, respectively, and H12-H11≤2mm.

[0172] The difference in distances between the second ends 22122 of any two adjacent first tabs 2212 and the first common stacking region Q1 may be the same or different. Figure 7 In some embodiments, H6-H5= H8-H7. In other embodiments, H6-H5≠H8-H7. Fig. 9 In some embodiments, H10-H9= H12-H11. In other embodiments, H10-H9≠H12-H11.

[0173] The difference in distances from the first ends 22121 of two adjacent first pole ears 2212 to the first common stacking region Q1 can also be equivalent to the distance between the first ends 22121 of two adjacent first pole ears 2212 in the direction from the first end 22121 to the second end 22122, that is, the distance between the first ends 22121 of two adjacent first pole ears 2212 in the direction from the first end 22121 to the second end 22122 is less than or equal to 2 mm.

[0174] The difference in distances from the first ends 22121 of two adjacent first electrode tabs 2212 to the first common stacking region Q1 may be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 2 mm, etc.

[0175] The difference in distances from the first ends 22121 of two adjacent first pole ears 2212 to the first common stacking area Q1 is less than or equal to 2 mm, so that after winding, the misalignment between the two adjacent first pole ears 2212 is small, so that the area of ​​the first pole ears 2212 outside the first common stacking area Q1 is smaller, and conversely, the area of ​​the first pole ears 2212 located in the first common stacking area Q1 is larger, which can not only reduce the area where the first pole ears 2212 are not involved in the connection, but also make the connection area between each first pole ear 2212 large enough, which is beneficial to improve the connection stability between each first pole ear 2212 and the connection stability between the multiple first pole ears 2212 and the electrode lead-out portion after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell 20 is improved.

[0176] In an embodiment where the distance between the first ends 22121 of the plurality of first tabs 2212 and the first common stacking region Q1 increases gradually from both sides to the middle in the second direction Y, as shown in FIG. Figure 8 , Fig. 9 As shown, the multiple first pole ears 2212 include multiple intermediate pole ears 22125 and two edge pole ears 22124. The two edge pole ears 22124 are the two first pole ears 2212 that are farthest apart. The first pole ear 2212 located between the two edge pole ears 22124 is the intermediate pole ear 22125. Along the opposite direction of the winding direction K of the first pole piece 221, the edge pole ear 22124 exceeds the second end 22122 of the intermediate pole ear 22125, and the second ends 22122 of the multiple intermediate pole ears 22125 are flush.

[0177] Looking at the structure after stacking multiple first tabs 2212, the edge tab 22124 can extend beyond the second end 22122 of the middle tab 22125 along the direction from the first end 22121 to the second end 22122. The distances by which the two edge tabs 22124 extend beyond the second end 22122 of the middle tab 22125 can be the same or different. Fig. 92 shows the situation where the second ends 22122 of the two edge tabs 22124 are flush, and the distances that the two edge tabs 22124 extend beyond the second end 22122 of the middle tab 22125 are the same.

[0178] The second ends 22122 of all the middle tabs 22125 are flush with the edge of the first common stack region Q1. The first ends 22121 of the two edge tabs 22124 may be flush or may not be flush. Figure 8 , Fig. 9 FIG. 2 shows a situation where the first ends 22121 of the two edge regions are flush.

[0179] The first end 22121 of at least one of the two edge pole ears 22124 is flush with the edge of the first common stack area Q1, that is, the second end 22122 of the middle pole ear 22125 and the first end 22121 of at least one of the two edge pole ears 22124 together form the two edges of the first common stack area Q1. In other words, the first common stack area Q1 is located between the second ends 22122 of all the middle pole ears 22125 and the first ends 22121 of the edge pole ears 22124.

[0180] The two edge pole ears 22124 that are farthest apart extend beyond the second end 22122 of the middle pole ear 22125 in the opposite direction of the winding direction K of the first pole sheet 221, and the second ends 22122 of the plurality of middle pole ears 22125 are flush, which is beneficial to increasing the area of ​​the first common stacking region Q1, improving the connection stability between the first pole ears 2212 and the connection stability between the stacked plurality of first pole ears 2212 and the electrode lead-out portion, thereby making the internal structure of the battery more stable and improving the reliability of the battery cell 20.

[0181] In some embodiments, the distance that the edge tab 22124 extends beyond the second end 22122 of the middle tab 22125 is less than or equal to 2 mm.

[0182] like Fig. 9 As shown, one edge pole ear 22124 extends beyond the second end 22122 of the middle pole ear 22125 by a distance D1, and the other edge pole ear 22124 extends beyond the second end 22122 of the middle pole ear 22125 by a distance D2, D1≤2mm, D2≤2mm.

[0183] The distance that the edge tab 22124 extends beyond the second end 22122 of the middle tab 22125 may be 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, etc.

[0184] The distances that the two edge tabs 22124 extend beyond the second end 22122 of the middle tab 22125 may be the same, ie, D1=D2, or may be different, ie, D1≠D2.

[0185] The distance that the edge pole ear 22124 exceeds the second end 22122 of the middle pole ear 22125 is less than or equal to 2 mm, so that after winding, the degree of misalignment between the edge pole ear 22124 and the middle pole ear 22125 is small, so that the area of ​​the edge pole ear 22124 outside the first common stacking area Q1 is smaller, and conversely, the area of ​​the edge pole ear 22124 located in the first common stacking area Q1 is larger, which can not only reduce the area where the edge pole ear 22124 is not involved in the connection, but also make the connection area between each first pole ear 2212 large enough, which is beneficial to improve the connection stability between each first pole ear 2212 and the connection stability between the multiple first pole ears 2212 after stacking and the electrode lead-out portion, so that the internal structure of the battery is more stable and the reliability of the battery cell 20 is improved.

[0186] exist Figure 8 , Fig. 9 In the illustrated embodiment, the plurality of first electrode tabs 2212 include two edge electrode tabs 22124 . The two edge electrode tabs 22124 are two first electrode tabs 2212 that are farthest apart. The first ends 22121 of the two edge electrode tabs 22124 are flush with the edge of the first common stack region Q1 .

[0187] It can be understood that the second end 22122 of the middle pole tab 22125 and the first end 22121 of the two edge pole tabs 22124 together form two edges of the first common stacking region Q1. In other words, the first common stacking region Q1 is located between the second ends 22122 of all the middle pole tabs 22125 and the first ends 22121 of the edge pole tabs 22124.

[0188] The first ends 22121 of the two edge pole ears 22124 are flush with the edge of the first common stacking area Q1, and one end of the edge pole ear 22124 is located outside the first common stacking area Q1, which is convenient for equidistant arrangement of two adjacent first pole ears 2212 along the winding direction K, and also makes the structure of multiple first pole ears 2212 more regular after stacking, which is convenient for connecting multiple first pole ears 2212 and connecting multiple first pole ears 2212 after stacking with the electrode lead-out portion.

[0189] In an embodiment where the distance between the first ends 22121 of the plurality of first tabs 2212 and the first common stacking region Q1 increases gradually from both sides to the middle in the second direction Y, as shown in FIG. Fig.10 , Fig.11As shown, the second ends 22122 of all the first pole ears 2212 can be flush, which is beneficial to increasing the area of ​​the first common stacking region Q1, further improving the connection stability between the various first pole ears 2212 and the connection stability between the stacked multiple first pole ears 2212 and the electrode lead-out portion, making the internal structure of the battery more stable and improving the reliability of the battery cell 20.

[0190] In other embodiments, Fig.12 , Fig.13 As shown, along the winding direction K of the first pole piece 221, each first pole ear 2212 has a first end 22121 and a second end 22122, and the first end 22121 is farther away from the winding starting end of the first pole piece 221 than the second end 22122; the multiple first pole ears 2212 include a separating pole ear 22126, a first side pole ear 22127 and a second side pole ear 22128, and the first side pole ear 22127 and the second side pole ear 22128 are respectively located on both sides of the separating pole ear 22126 in the second direction Y, and the separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 along the winding direction K of the first pole piece 221, and the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 are flush.

[0191] There may be one or more first side tabs 22127. There may be one or more second side tabs 22128. The number of first side tabs 22127 may be the same as or different from the number of second side tabs 22128. The first end 22121 of the first side tab 22127 and the first end 22121 of the second side tab 22128 are both flush with the edge of the first common stacking region Q1.

[0192] The separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 along the winding direction K of the first pole piece 221. Referring to the structure after multiple first pole ears 2212 are stacked, the separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 along the direction from the second end 22122 to the first end 22121.

[0193] The separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 along the winding direction K of the first pole sheet 221, and the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 are flush, which is beneficial to increase the area of ​​the first common stacking area Q1, improve the connection stability between each first pole ear 2212 and the connection stability between the stacked multiple first pole ears 2212 and the electrode lead-out portion, make the internal structure of the battery more stable, improve the reliability of the battery cell 20, and also help to improve the current flow capacity of the first common stacking area Q1.

[0194] like Fig.13 As shown, in some embodiments, there are multiple first side tabs 22127 and / or second side tabs 22128 .

[0195] It can be understood that there are multiple first-side tabs 22127 and multiple second-side tabs 22128; or there is one first-side tab 22127 and multiple second-side tabs 22128; or there are multiple first-side tabs 22127 and one second-side tab 22128.

[0196] There are multiple first-side pole ears 22127 and / or second-side pole ears 22128, so that the number of first pole ears 2212 is large, which is beneficial to improving the current capacity and charging speed, and making the current distribution more uniform, reducing the risk of lithium deposition in the battery cell 20, and improving the reliability of the battery cell 20.

[0197] In an embodiment where the separating tab 22126 extends beyond the first end 22121 of the first side tab 22127 and the first end 22121 of the second side tab 22128 along the winding direction K of the first pole piece 221, and the first end 22121 of the first side tab 22127 and the first end 22121 of the second side tab 22128 are flush, as shown in FIG. Fig.12 , Fig.13 As shown, the distances from the second ends 22122 of the plurality of first electrode tabs 2212 to the first common stacking region Q1 gradually decrease from both sides to the middle in the second direction Y.

[0198] The second end 22122 of the partitioning tab 22126 is the one closest to the first common stacking region Q1 among the first ends 22121 of all the first tabs 2212 . Specifically, the second end 22122 of the partitioning tab 22126 is flush with the edge of the first common stacking region Q1 .

[0199] The separating pole ear 22126 extends beyond the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 in the opposite direction of the winding direction K of the first pole sheet 221, the first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 are flush, and the distance from the second ends 22122 of the plurality of first pole ears 2212 to the first common stacking region Q1 gradually decreases from both sides to the middle in the second direction Y, which is conducive to achieving equal spacing between adjacent first pole ears 2212, and is conducive to increasing the area of ​​the first common stacking region Q1, improving the connection stability between the first pole ears 2212 and the connection stability between the plurality of first pole ears 2212 after stacking and the electrode lead-out portion, making the internal structure of the battery more stable and improving the reliability of the battery cell 20.

[0200] like Fig.13 As shown, in some embodiments, the distance that the separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 along the winding direction K of the first pole piece 221 is less than or equal to 2 mm, and the distance that the separating pole ear 22126 exceeds the first end 22121 of the second side pole ear 22128 along the winding direction K of the first pole piece 221 is less than or equal to 2 mm.

[0201] The distance D3 of the separating electrode tab 22126 beyond the first end 22121 of the first side electrode tab 22127 along the winding direction K of the first electrode sheet 221 is, where D3≤2 mm.

[0202] Since the first end 22121 of the first side pole ear 22127 is flush with the first end 22121 of the second side pole ear 22128, the distance that the separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 along the winding direction K of the first pole piece 221 is the same as the distance that the separating pole ear 22126 exceeds the first end 22121 of the second side pole ear 22128 along the winding direction K of the first pole piece 221.

[0203] The distance that the separating tab 22126 exceeds the first end 22121 of the first side tab 22127 along the winding direction K of the first pole piece 221 can be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2.0 mm, etc. The distance that the separating tab 22126 exceeds the first end 22121 of the second side tab 22128 along the winding direction K of the first pole piece 221 can be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2.0 mm, etc.

[0204] The distance that the separating pole ear 22126 exceeds the first end 22121 of the first side pole ear 22127 along the winding direction K of the first pole piece 221 is less than or equal to 2 mm, and the distance that the separating pole ear 22126 exceeds the first end 22121 of the second side pole ear 22128 along the winding direction K of the first pole piece 221 is less than or equal to 2 mm, so that after winding, the misalignment degree between the separating pole ear 22126, the first side pole ear 22127 and the second side pole ear 22128 is small, so that the first pole ear 2212 is located at the same position as the first pole ear 22128. The area outside the first common stacking area Q1 is smaller, and conversely, the area of ​​the first pole ear 2212 located in the first common stacking area Q1 is larger, which can not only reduce the area where the first pole ear 2212 does not participate in the connection, but also make the connection area between each first pole ear 2212 large enough, which is beneficial to improve the connection stability between each first pole ear 2212 and the connection stability between the multiple first pole ears 2212 and the electrode lead-out part after stacking, so that the internal structure of the battery is more stable and the reliability of the battery cell 20 is improved.

[0205] like Fig.12 , Fig.13 As shown, in some embodiments, the first end 22121 of the first side tab 22127 and the first end 22121 of the second side tab 22128 are both flush with the edge of the first common stack region Q1, and the second end 22122 of the partition tab 22126 is flush with the edge of the first common stack region Q1.

[0206] It can be understood that the first common stack region Q1 is located between the first end 22121 of the first side tab 22127 and the second end 22122 of the partition tab 22126 .

[0207] The first end 22121 of the first side pole ear 22127 and the first end 22121 of the second side pole ear 22128 are both flush with the edge of the first common stacking area Q1, and the second end 22122 of the separating pole ear 22126 is flush with the edge of the first common stacking area Q1. Then, only one end of the first side pole ear 22127, the second side pole ear 22128 and the separating pole ear 22126 is located outside the first common stacking area Q1, so that it is convenient to arrange two adjacent first pole ears 2212 along the winding direction K at equal intervals, and also makes the structure of the multiple first pole ears 2212 after stacking more regular, so as to facilitate the connection of the multiple first pole ears 2212 and the connection of the multiple first pole ears 2212 after stacking with the electrode lead-out portion.

[0208] like Fig.14 , Fig.15As shown, along the winding direction K of the first pole piece 221, each first pole ear 2212 has a first end 22121 and a second end 22122, the first end 22121 is farther away from the winding starting end of the first pole piece 221 than the second end 22122, and the distance from the second ends 22122 of the multiple first pole ears 2212 to the first common stacking area Q1 gradually decreases from both sides to the middle in the second direction Y, and the first ends 22121 of all the first pole ears 2212 are flush, which is beneficial to increase the area of ​​the first common stacking area Q1, improve the connection stability between the various first pole ears 2212 and the connection stability between the multiple first pole ears 2212 after stacking and the electrode lead-out portion, so that the internal structure of the battery is more stable, the reliability of the battery cell 20 is improved, and it is also beneficial to improve the current flow capacity of the first common stacking area Q1.

[0209] The electrode assembly 22 also includes a second pole piece 222 having a polarity opposite to that of the first pole piece 221. The second pole piece 222 includes a second body 2221 and a plurality of second pole tabs 2222. The second pole tab 2222 is connected to one end of the second body 2221 along the first direction X. The plurality of second pole tabs 2222 are stacked along the third direction. In an embodiment in which the plurality of first pole tabs 2212 are arranged at equal intervals along the winding direction K of the first pole piece 221, the plurality of second pole tabs 2222 may be arranged at non-equal intervals along the winding direction K of the second pole piece 222 to reduce the degree of misalignment between the second pole tabs 2222.

[0210] When the second pole tabs 2222 are arranged at unequal intervals and the plurality of second pole tabs 2222 have the same width, all the second pole tabs 2222 may completely overlap when viewed along the third direction. Figure 8 shown.

[0211] like Fig.16 , Fig.17 As shown, in other embodiments, the electrode assembly 22 also includes a second pole piece 222, the second pole piece 222 has an opposite polarity to the first pole piece 221, the second pole piece 222 includes a second main body 2221 and a plurality of second pole ears 2222, the second pole ear 2222 is connected to one end of the second main body 2221 along the first direction X, and the plurality of second pole ears 2222 are arranged at equal intervals along the winding direction K of the second pole piece 222; all the second pole ears 2222 are stacked along the third direction and form a second common stacking area Q2, in a projection plane perpendicular to the third direction, the orthographic projections of any two second pole ears 2222 located in the second common stacking area Q2 overlap, the first direction X and the third direction intersect, and in the second common stacking area Q2, two adjacent second pole ears 2222 are connected.

[0212] The first electrode piece 221 is a positive electrode piece, and the second electrode piece 222 is a negative electrode piece. If the first electrode piece 221 is a negative electrode piece, the second electrode piece 222 is a positive electrode piece. Fig.16, the first electrode piece 221 is a positive electrode piece, and the second electrode piece 222 is a negative electrode piece.

[0213] Along the winding direction K of the second pole piece 222, the plurality of second pole ears 2222 are arranged at equal intervals, wherein the plurality of second pole ears 2222 are not arranged at absolutely equal intervals. Due to limitations of production equipment, production process, etc., there may be certain errors in the spacing between some second pole ears 2222. Exemplarily, the allowable error of the spacing difference between adjacent first pole ears 2212 is ±10 mm.

[0214] like Fig.16 As shown, a plurality of second pole tabs 2222 are stacked along the third direction on one side of the winding center hole 22c of the electrode assembly 22. The plurality of second pole tabs 2222 may be located in the straight region 22a or in the same bending region 22b. Fig.16 2 shows that the second pole tabs 2222 are located in the straight area 22a. After winding, the second pole tabs 2222 are still flat along the winding direction K of the second pole piece 222, which is convenient for welding. The winding direction K of the second pole piece 222 is the same as the winding direction K of the first pole piece 221.

[0215] The third direction may be any direction perpendicular to the extension direction of the winding axis of the electrode assembly 22, and the third direction may be perpendicular to the first direction X. The third direction may be parallel to the second direction Y, such as Fig.17 As shown, the first direction X, the second direction Y and the fourth direction Z are perpendicular to each other, and the second direction Y and the third direction are parallel.

[0216] In the second common stacking region Q2 , two adjacent second electrode tabs 2222 may be connected by welding or by bonding with a conductive adhesive.

[0217] The plurality of second pole tabs 2222 are arranged at equal intervals along the winding direction K of the second pole sheet 222, which is conducive to uniform current density distribution, reduces the risk of lithium deposition in the battery cell 20, and improves the reliability of the battery cell 20. All the second pole tabs 2222 are stacked along the third direction to form a second common stacking area Q2. In the projection plane perpendicular to the third direction, the orthographic projections of the areas of any two second pole tabs 2222 located in the second common stacking area Q2 overlap, which reduces the degree of misalignment between the second pole tabs 2222 after winding, facilitates the connection between the second pole tabs 2222, improves the connection firmness, and is also conducive to the connection equipment aligning the stacked plurality of second pole tabs 2222 and the electrode lead-out portion (such as the current collecting member), thereby improving the connection firmness between the stacked plurality of second pole tabs 2222 and the electrode lead-out portion, reducing the risk of separation, and thus facilitating the improvement of the reliability of the battery cell 20. All the second pole ears 2222 are stacked along the third direction to form a second common stacking area Q2. In the projection plane perpendicular to the third direction, the positive projections of any two second pole ears 2222 located in the second common stacking area Q2 overlap. In the second common stacking area Q2, two adjacent second pole ears 2222 are connected, which is also beneficial to improving the current carrying capacity after the multiple second pole ears 2222 are stacked and connected, thereby improving the charging speed of the battery cell 20. Therefore, in this scheme, a plurality of second pole ears 2222 are arranged at equal intervals along the winding direction K of the second pole sheet 222, and all the second pole ears 2222 are stacked along the third direction to form a second common stacking area Q2. In the projection plane perpendicular to the third direction, the orthographic projections of the areas of any two second pole ears 2222 located in the second common stacking area Q2 overlap, thereby making the current distribution uniform, thereby further reducing the risk of lithium deposition in the battery cell 20, and making the connection between the respective second pole ears 2222 and the connection between the stacked second pole ears 2222 and the electrode lead-out portion more secure, thereby improving the reliability of the battery cell 20, and also being beneficial to improving the current carrying capacity after the plurality of second pole ears 2222 are stacked and connected, thereby further improving the charging speed of the battery cell 20.

[0218] like Fig.17 As shown, in some embodiments, in a projection plane perpendicular to the third direction, a ratio of an area of ​​an orthographic projection of the second common stack region Q2 to an area of ​​an orthographic projection of any second pole tab 2222 is greater than or equal to 0.5.

[0219] Exemplarily, the projection area of ​​one of the two second pole ears 2222 farthest from each other in the third direction in the projection plane perpendicular to the third direction is S', the orthographic projection area of ​​the second common stack region Q2 in the projection plane perpendicular to the third direction is S2, and S2 / S'≥0.5.

[0220] In the projection plane perpendicular to the third direction, the ratio of the area of ​​the orthographic projection of the second common stack region Q2 to the area of ​​the orthographic projection of any second pole ear 2222 may be 0.5, 0.55, 0.6, 0.65, 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0221] In the projection plane perpendicular to the third direction, the ratio of the area of ​​the orthographic projection of the second common stacking region Q2 to the area of ​​the orthographic projection of any second pole ear 2222 is greater than or equal to 0.5, so that the connection area between each second pole ear 2222 is larger, and the connection stability between each second pole ear 2222 and the connection stability between the stacked multiple second pole ears 2222 and the electrode lead-out portion are further improved, so that the internal structure of the battery is more stable and the reliability of the battery cell 20 is improved.

[0222] After the plurality of second pole tabs 2222 are arranged at equal intervals along the winding direction K of the second pole piece 222 and stacked along the third direction to form a second common stacking region Q2, the structural form of the plurality of second pole tabs 2222 can refer to the plurality of first pole tabs 2212. For example, Fig.16 , Fig.18 As shown, along the winding direction K of the second pole piece 222, each second pole ear 2222 has a third end 22221 and a fourth end 22222, the third end 22221 is farther away from the winding starting end of the second pole piece 222 than the fourth end 22222, and the distance from the third end 22221 of the plurality of second pole ears 2222 to the second common stacking area Q2 gradually increases from both sides to the middle in the third direction, and the distance from the fourth end 22222 of the plurality of first pole ears 2212 to the second common stacking area Q2 gradually decreases from both sides to the middle in the third direction.

[0223] The embodiment of the present application further provides a battery device 100 , and the battery device 100 includes the battery cell 20 provided in any of the above embodiments.

[0224] The battery cell 20 provided in any of the above embodiments has good reliability, and the battery device 100 including the battery cell 20 also has good reliability.

[0225] The embodiment of the present application further provides an electrical device, which includes the battery cell 20 provided by any of the above embodiments or the battery device 100 provided by the above embodiments.

[0226] The battery cell 20 and the battery device 100 provided in any of the above embodiments have good reliability, so that the power consumption reliability of the power-consuming device powered by the battery cell 20 or the battery device 100 is good.

[0227] The embodiment of the present application provides a battery cell 20, which includes a wound electrode assembly 22, wherein the electrode assembly 22 includes a straight region 22a and two bending regions 22b, wherein the two bending regions 22b are respectively connected to two ends of the straight region 22a along a fourth direction Z. The electrode assembly 22 includes a first pole piece 221, a second pole piece 222 and a separator 223, wherein the first pole piece 221 is a positive pole piece, and the second pole piece 222 is a negative pole piece. The first pole piece 221 includes a first main body 2211 and a plurality of first pole tabs 2212, wherein the first pole tab 2212 is connected to one end of the first main body 2211 along the first direction X, and the plurality of first pole tabs 2212 are arranged at equal intervals along the winding direction K of the first pole piece 221; the second pole piece 222 includes a second main body 2221 and a plurality of second pole tabs 2222, wherein the second pole tab 2222 is connected to one end of the second main body 2221 along the first direction X, and the plurality of second pole tabs 2222 are arranged at equal intervals along the winding direction K of the second pole piece 222. All the first pole tabs 2212 are stacked along the second direction Y and form a first common stacking region Q1. In a projection plane perpendicular to the second direction Y, the orthographic projections of any two first pole tabs 2212 located in the first common stacking region Q1 overlap, the first direction X and the second direction Y intersect, and in the first common stacking region Q1, two adjacent first pole tabs 2212 are connected. All the second pole tabs 2222 are stacked along the third direction to form a second common stacking area Q2. In the projection plane perpendicular to the third direction, the orthographic projections of the areas of any two second pole tabs 2222 located in the second common stacking area Q2 overlap. In the first common stacking area Q1, two adjacent first pole tabs 2212 are welded. In the second common stacking area Q2, two adjacent second pole tabs 2222 are welded. The first direction X, the second direction Y, and the fourth direction Z are perpendicular to each other, and the second direction Y is parallel to the third direction. In the projection plane perpendicular to the second direction Y, the ratio of the orthographic projection area of ​​the first common stacking area Q1 to the orthographic projection area of ​​any first pole tab 2212 is greater than or equal to 0.5. In the projection plane perpendicular to the third direction, the ratio of the orthographic projection area of ​​the second common stacking area Q2 to the orthographic projection area of ​​any second pole tab 2222 is greater than or equal to 0.5.

[0228] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0229] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: An electrode assembly is a winding structure, the electrode assembly includes a first pole piece, the first pole piece includes a first body and a plurality of first pole ears, the first pole ear is connected to one end of the first body along a first direction, and the plurality of first pole ears are arranged at equal intervals along the winding direction of the first pole piece; all the first pole ears are stacked along a second direction on one side of the winding center hole of the electrode assembly and form a first common stacking area, in a projection plane perpendicular to the second direction, the orthographic projections of any two first pole ears located in the first common stacking area overlap, the first direction and the second direction intersect, and in the first common stacking area, two adjacent first pole ears are connected; Along the winding direction of the first pole piece, each of the first pole ears has a first end and a second end opposite to each other, the plurality of first pole ears include a plurality of middle pole ears and two edge pole ears, the two edge pole ears are the two first pole ears farthest apart, the first pole ear located between the two edge pole ears is the middle pole ear, and the edge of the first common stacking region includes the first end of at least one edge pole ear and the second end of at least one middle pole ear; In a projection plane perpendicular to the second direction, a ratio of an area of ​​an orthographic projection of the first common stacking region to an area of ​​an orthographic projection of any of the first electrode tabs is greater than or equal to 0.

5.

2. The battery cell according to claim 1, characterized in that: Along the winding direction of the first pole piece, each of the first pole ears has a first end and a second end, the first end is farther away from the winding starting end of the first pole piece than the second end, and the distance from the first ends of multiple first pole ears to the first common stacking area gradually increases from both sides to the middle in the second direction.

3. The battery cell according to claim 2, characterized in that: The distances from the second ends of the plurality of first electrode tabs to the first common stacking region gradually decrease from both sides to the middle in the second direction.

4. The battery cell according to claim 3, characterized in that: Along the winding direction of the first pole piece, the sizes of the plurality of first pole tabs are equal.

5. The battery cell according to claim 3, characterized in that: The difference in distances from the second ends of two adjacent first electrode tabs to the first common stacking region is less than or equal to 2 mm.

6. The battery cell according to claim 2, characterized in that: The difference in distances from the first ends of two adjacent first electrode tabs to the first common stacking region is less than or equal to 2 mm.

7. The battery cell according to claim 2, characterized in that: The multiple first pole ears include multiple middle pole ears and two edge pole ears, the two edge pole ears are the two first pole ears that are farthest apart, the first pole ear located between the two edge pole ears is the middle pole ear, and along the opposite direction of the winding direction of the first pole sheet, the edge pole ear exceeds the second end of the middle pole ear, and the second ends of the multiple middle pole ears are flush.

8. The battery cell according to claim 7, characterized in that: The distance that the edge tab extends beyond the second end of the middle tab is less than or equal to 2 mm.

9. The battery cell according to claim 2, characterized in that: The plurality of first electrode tabs include two edge electrode tabs, the two edge electrode tabs are two first electrode tabs that are farthest apart, and the first ends of the two edge electrode tabs are flush with an edge of the first common stacking region.

10. The battery cell according to claim 1, characterized in that: Along the winding direction of the first pole piece, each of the first pole lugs has a first end and a second end, and the first end is farther away from the winding start end of the first pole piece than the second end; The plurality of first pole tabs include a separating pole tab, a first side pole tab, and a second side pole tab. The first side pole tab and the second side pole tab are respectively located on both sides of the separating pole tab in the second direction. The separating pole tab extends beyond the first end of the first side pole tab and the first end of the second side pole tab along the winding direction of the first pole sheet. The first end of the first side pole tab and the first end of the second side pole tab are flush.

11. The battery cell according to claim 10, characterized in that: There are multiple first-side electrode tabs and / or multiple second-side electrode tabs.

12. The battery cell according to claim 10, characterized in that: The distances from the second ends of the plurality of first electrode tabs to the first common stacking region gradually decrease from both sides to the middle in the second direction.

13. The battery cell according to claim 10, characterized in that: The distance that the separating pole tab extends beyond the first end of the first side pole tab along the winding direction of the first pole sheet is less than or equal to 2 mm, and the distance that the separating pole tab extends beyond the first end of the second side pole tab along the winding direction of the first pole sheet is less than or equal to 2 mm.

14. The battery cell according to claim 10, characterized in that: The first end of the first side tab and the first end of the second side tab are both flush with the edge of the first common stacking region, and the second end of the partition tab is flush with the edge of the first common stacking region.

15. The battery cell according to claim 1, characterized in that: The electrode assembly also includes a second pole piece, which has an opposite polarity to the first pole piece, and includes a second main body and a plurality of second pole ears, wherein the second pole ear is connected to one end of the second main body along the first direction, and the plurality of second pole ears are arranged at equal intervals along the winding direction of the second pole piece; all the second pole ears are stacked along a third direction to form a second common stacking area, and in a projection plane perpendicular to the third direction, the orthographic projections of any two of the second pole ears located in the second common stacking area overlap, the first direction and the third direction intersect, and in the second common stacking area, two adjacent second pole ears are connected.

16. The battery cell according to claim 15, characterized in that: In a projection plane perpendicular to the third direction, a ratio of an area of ​​an orthographic projection of the second common stacking region to an area of ​​an orthographic projection of any second electrode tab is greater than or equal to 0.

5.

17. A battery device, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 16.

18. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 16 or the battery device according to claim 17.

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