Pole piece, battery cell, electric device, and manufacturing method of battery cell

Abstract

The application discloses a pole piece, a battery cell, a power utilization device and a manufacturing method of the battery cell. The pole piece comprises a current collector; the current collector comprises a first conductive layer, a support layer and a second conductive layer which are stacked along a first direction; the support layer has a first surface and a second surface which are opposite along the first direction; the first conductive layer is connected to the first surface of the support layer; the second conductive layer is connected to the second surface of the support layer; the current collector further comprises a conductive member which penetrates through the support layer along the first direction and is fused with the support layer; a first end of the conductive member is fused with the first conductive layer, and a second end of the conductive member is fused with the second conductive layer. According to the pole piece, the battery cell, the power utilization device and the manufacturing method of the battery cell provided by the application, the tab can be reliably connected with the first conductive layer and the second conductive layer without increasing the overall space occupied by the tab area, and the quality of the battery cell is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to an electrode, a battery cell, an electrical device, and a method for manufacturing the battery cell. Background Technology

[0002] The composite current collector is an important component of the electrode, typically consisting of an intermediate layer made of polymer material and metal layers on either side of the intermediate layer. During the manufacturing process of the battery cell, the tabs need to be connected to the two metal layers of the composite current collector to achieve circuit conductivity.

[0003] Improving the connection quality between the tab and the metal layer of the composite current collector has always been a research direction in the industry. Summary of the Invention

[0004] In related technologies, the tabs usually need to be connected to the two metal layers separately through external metal foils. However, the welding method of connecting through metal foils increases the overall space occupied by the tab area. At the same time, due to the large number of welding positions, the probability of over-welding or cold solder joints increases, affecting the quality of the battery cell.

[0005] Therefore, embodiments of this application provide an electrode sheet, a battery cell, an electrical device, and a method for manufacturing the battery cell, which can reliably connect the electrode sheet to the first conductive layer and the second conductive layer without increasing the overall space occupied by the electrode area, thereby improving the quality of the battery cell.

[0006] On one hand, embodiments of this application provide an electrode sheet, wherein the electrode sheet includes a current collector; the current collector includes a first conductive layer, a support layer, and a second conductive layer stacked along a first direction; the support layer has a first side and a second side opposite to each other along the first direction; the first conductive layer is connected to the first side of the support layer; the second conductive layer is connected to the second side of the support layer; the current collector also includes a conductive member, the conductive member penetrates the support layer along the first direction and is fused to the support layer; a first end of the conductive member is fused to the first conductive layer, and a second end of the conductive member is fused to the second conductive layer.

[0007] In some embodiments, the conductive member is tapered, with the dimension of the first end along the second direction being greater than the dimension of the second end along the second direction, and the dimension of the first end along the third direction being greater than the dimension of the second end along the third direction; the first direction, the second direction, and the third direction are perpendicular to each other.

[0008] In some embodiments, the end face of the first end is connected to the surface of the first conductive layer facing the support layer; or, the end face of the first end protrudes from the first surface of the support layer, and a portion of the conductive member is inserted into the first conductive layer along the first direction; or, the conductive member penetrates the first conductive layer along the first direction, and the end face of the first end is flush with the surface of the first conductive layer away from the support layer; or, the conductive member penetrates the first conductive layer along the first direction, and the end face of the first end protrudes from the surface of the first conductive layer away from the support layer.

[0009] In some embodiments, the end face of the second end is connected to the surface of the second conductive layer facing the support layer; or, the end face of the second end protrudes from the second surface of the support layer, and a portion of the conductive member is inserted into the second conductive layer along the first direction; or, the conductive member penetrates the second conductive layer along the first direction, and the end face of the second end is flush with the surface of the second conductive layer away from the support layer; or, the conductive member penetrates the second conductive layer along the first direction, and the end face of the second end protrudes from the surface of the second conductive layer away from the support layer.

[0010] In some embodiments, the conductive member penetrates the first conductive layer along a first direction, with the end face of the first end flush with or protruding from the surface of the first conductive layer away from the support layer; the end face of the second end is in contact with the surface of the second conductive layer facing the support layer, or the end face of the second end protrudes from the second surface of the support layer, and a portion of the conductive member is inserted into the second conductive layer along the first direction.

[0011] In some embodiments, the end face of the first end is connected to the surface of the first conductive layer facing the support layer; or the end face of the first end protrudes from the first surface of the support layer, and a portion of the conductive member is inserted into the first conductive layer along the first direction; the conductive member penetrates the second conductive layer along the first direction, and the end face of the second end is flush with or protrudes from the surface of the second conductive layer away from the support layer.

[0012] In some embodiments, the conductive member has a dimension of 50 μm to 90 μm along the first direction, and a dimension of 0.5 μm to 3 μm along the second and third directions; the first, second, and third directions are perpendicular to each other.

[0013] On the other hand, embodiments of this application provide a battery cell, wherein the battery cell includes a tab; and an electrode sheet as described above; the tab is fused to a first end or a second end of a conductive member.

[0014] In some implementations, the conductive member is connected to the tab along a first direction.

[0015] In some embodiments, the conductive member is a burr structure protruding from the tab.

[0016] In another aspect, embodiments of this application provide a method for manufacturing a battery cell, wherein the method for manufacturing the battery cell as described above includes: setting a support layer, wherein the support layer has a first surface and a second surface opposite to each other along a first direction; setting a conductive member, wherein the conductive member penetrates the support layer along the first direction, and a first end of the conductive member protrudes or is flush with the first surface, and a second end of the conductive member protrudes or is flush with the second surface; setting a first conductive layer, wherein the first end of the conductive member is welded to the first surface and the first conductive layer by resistance welding; setting a second conductive layer, wherein the second end of the conductive member is welded to the second surface and the second conductive layer by resistance welding; and welding and fixing the tab to the conductive member by resistance welding.

[0017] In some embodiments, the end face of the first end of the conductive member is flush with or protrudes from the surface of the first conductive layer away from the support layer, and a portion of the conductive member penetrates through the first conductive layer, the end face of the second end of the conductive member protrudes from the second surface, and a portion of the conductive member is inserted into the second conductive layer.

[0018] In some embodiments, the method of manufacturing the battery cell further includes burring the tabs, so that burrs are formed on at least one side surface of the tabs along a first direction, and the burrs serve as conductive components.

[0019] In another aspect, embodiments of this application provide an electrical device, wherein the electrical device includes the electrode or battery cell as described above.

[0020] The electrode sheet, battery cell, electrical device, and battery cell manufacturing method of this application embodiment, by setting a conductive component through the support layer and using pressure fusion resistance welding, connects the first end of the conductive component to the first conductive layer and the second end of the conductive component to the second conductive layer, which can effectively conduct the first conductive layer and the second conductive layer. In subsequent processing, the electrode tab can be welded and fixed to the conductive component to realize the circuit conduction, eliminating the use of external metal foil, reducing the impact on the overall space occupied by the electrode tab area, and improving the quality of the battery cell. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a partial structural schematic diagram of a battery cell provided in one embodiment of this application;

[0023] Figure 2 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application;

[0024] Figure 3 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application;

[0025] Figure 4 This is a flowchart of a method for manufacturing a battery cell according to another embodiment of this application.

[0026] Explanation of icon numbers:

[0027] 100. Current collector;

[0028] 1. Support layer; 11. First surface; 12. Second surface;

[0029] 2. First conductive layer;

[0030] 3. Second conductive layer;

[0031] 4. Conductive component; 41. First end; 42. Second end;

[0032] 200, Polar Ear;

[0033] X, first direction;

[0034] Y, the second direction;

[0035] Z, Third-party orientation. Detailed Implementation

[0036] The following detailed descriptions are exemplary and not limiting, intended to provide a basic understanding of the present application, and are not intended to identify key or decisive elements of the application or to limit the scope of protection. The terms "first," "second," etc., in the specification, claims, or accompanying drawings are used to distinguish different objects, not to describe a specific order or hierarchy.

[0037] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In the embodiments of this application, "aligned" includes not only the case of absolute alignment, but also the case of approximate alignment as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the included angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the included angle between two surfaces is 0° to 10°, or if there is a preset height difference between the two surfaces, the two surfaces can be considered parallel.

[0039] The first direction X, the second direction Y, and the third direction Z described in the embodiments of this application are only for the purpose of more clearly illustrating the specific structure of this application in conjunction with the accompanying drawings, and this application is not limited thereto.

[0040] Optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0041] The electrode, battery cell, electrical device, and method of manufacturing the battery cell of this application are described below with reference to the accompanying drawings.

[0042] like Figure 1 As shown in the figure, this application provides an electrode sheet, wherein the electrode sheet includes a current collector 100, and the current collector 100 includes a first conductive layer 2, a support layer 1 and a second conductive layer 3 stacked along a first direction X.

[0043] The first conductive layer 2 and the second conductive layer 3 are made of metal, and the support layer 1 is made of insulating polymer material.

[0044] The support layer 1 has a first surface 11 and a second surface 12 facing away from each other along the first direction X; the first conductive layer 2 is connected to the first surface 11 of the support layer 1; the second conductive layer 3 is connected to the second surface 12 of the support layer 1; the first conductive layer 2, the support layer 1 and the second conductive layer 3 are fixedly connected to form an integral sheet structure.

[0045] The current collector 100 also includes a conductive member 4, which penetrates the support layer 1 along a first direction X and is fused to the support layer 1. The first end 41 of the conductive member 4 is fused to the first conductive layer 2, and the second end 42 of the conductive member 4 is fused to the second conductive layer 3. The conductive member 4 is fixed to the first conductive layer 2 and the second conductive layer 3 by pressure fusion resistance welding, which has the advantages of high productivity, small weld deformation, and easy automation. The conductive member 4 is made of metal and has good conductivity. By setting the conductive member 4, circuit conduction between the first conductive layer 2 and the second conductive layer 3 can be achieved, improving the reliability of the connection between the conductive member 4 and the first conductive layer 2, and between the conductive member 4 and the second conductive layer 3. In subsequent processing, the tab 200 can be welded to the conductive member 4 to achieve circuit conduction and improve the quality of the battery cell. At the same time, it eliminates the need for external metal foil in related technologies, reduces the overall space occupied at the connection point between the current collector 100 and the tab 200, and simplifies processing.

[0046] like Figure 2 As shown, in some embodiments, the conductive member 4 is conical, with the dimension of the first end 41 along the second direction Y being greater than the dimension of the second end 42 along the second direction Y, and the dimension of the first end 41 along the third direction Z being greater than the dimension of the second end 42 along the third direction Z.

[0047] Optionally, the conductive member 4 is conical or pyramidal in shape. The conical shape of the conductive member 4 is conducive to guiding the conductive member 4 to pass smoothly through the support layer 1.

[0048] Optionally, the support layer 1 has pre-formed holes corresponding to the conductive member 4, allowing the conductive member 4 to pass through. When the conductive member 4 is conical, the step of pre-forming the holes can be omitted, and the smaller end of the conductive member 4 can be used to pierce through the support layer.

[0049] like Figures 1 to 3 As shown, in some embodiments, the end face of the first end 41 is in contact with the surface of the first conductive layer 2 facing the support layer 1, thereby realizing circuit conduction between the conductive member 4 and the first conductive layer 2.

[0050] In some embodiments, the end face of the first end 41 protrudes from the first surface of the support layer 1, and the first end 41 is inserted into the first conductive layer 2 along the first direction X. While realizing the circuit connection between the conductive member 4 and the first conductive layer 2, it increases the connection area between the conductive member 4 and the first conductive layer 2, thereby improving the reliability of the structural connection and circuit connection between the conductive member 4 and the first conductive layer 2.

[0051] In some embodiments, the conductive member 4 penetrates the first conductive layer 2 along the first direction X, and the end face of the first end 41 is flush with the surface of the first conductive layer 2 away from the support layer 1. Compared with the previous embodiment, this can further increase the connection area between the conductive member 4 and the first conductive layer 2, and improve the connection area between the conductive member 4 and the first conductive layer 2. At the same time, in the subsequent process of connecting the tab 200, the conductive member 4 can directly contact and connect with the tab 200 to realize circuit conduction.

[0052] In some embodiments, the conductive member 4 penetrates the first conductive layer 2 along the first direction X, and the end face of the first end 41 protrudes from the surface of the first conductive layer 2 away from the support layer 1. This not only increases the connection area between the conductive member 4 and the first conductive layer 2, but also allows the portion of the conductive member 4 protruding from the surface of the first conductive layer 2 away from the support layer 1 to be inserted into the electrode 200 in the subsequent process of connecting the tab 200. This increases the connection area between the conductive member 4 and the tab 200, improves the structural connection strength between the conductive member 4 and the tab 200, and makes it less likely for the conductive member 4 and the tab 200 to separate and cause the circuit to break, thereby improving the circuit conduction quality.

[0053] In some embodiments, the end face of the second end 42 is connected to the surface of the second conductive layer 3 facing the support layer 1, thereby enabling circuit conduction between the conductive member 4 and the second conductive layer 3.

[0054] In some embodiments, the end face of the second end 42 protrudes from the second surface of the support layer 1, and the end face of the second end 42 is inserted into the second conductive layer 3 along the first direction X. While realizing the circuit connection between the conductive member 4 and the second conductive layer 3, the connection area between the conductive member 4 and the second conductive layer 3 is increased, thereby improving the reliability of the structural connection and circuit connection between the conductive member 4 and the second conductive layer 3.

[0055] In some embodiments, the conductive member 4 penetrates the second conductive layer 3 along the first direction X, and the end face of the second end 42 is flush with the surface of the second conductive layer 3 away from the support layer 1. Compared with the previous embodiment, this can further increase the connection area between the conductive member 4 and the second conductive layer 3, and improve the connection area between the conductive member 4 and the second conductive layer 3. At the same time, in the subsequent process of connecting the tab 200, the conductive member 4 can directly contact and connect with the tab 200 to realize circuit conduction.

[0056] In some embodiments, the conductive member 4 penetrates the second conductive layer 3 along the first direction X, and the end face of the second end 42 protrudes from the surface of the second conductive layer 3 away from the support layer 1. This not only increases the connection area between the conductive member 4 and the second conductive layer 3, but also allows the portion of the conductive member 4 protruding from the surface of the second conductive layer 3 away from the support layer 1 to be inserted into the electrode 200 in the subsequent process of connecting the tab 200. This increases the connection area between the conductive member 4 and the tab 200, improves the structural connection strength between the conductive member 4 and the tab 200, and makes it less likely for the conductive member 4 and the tab 200 to separate and cause the circuit to break, thereby improving the circuit conduction quality.

[0057] The connection methods between the conductive component 4 and the first conductive layer 2, and between the conductive component 4 and the second conductive layer 3, can be flexibly combined to form a variety of optional schemes.

[0058] Optionally, in some embodiments, the conductive member 4 penetrates the first conductive layer 2 along the first direction X, and the end face of the first end 41 is flush with or protrudes from the surface of the first conductive layer 2 away from the support layer 1; in the subsequent process of connecting the tab 200, the first end 41 of the conductive member 4 can be directly connected to the tab 200, thereby improving the structural connection strength between the conductive member 4 and the tab 200, making it less likely for the conductive member 4 and the tab 200 to separate and cause the circuit to break, thus improving the reliability of circuit conduction.

[0059] Optionally, in some embodiments, the end face of the second end 42 is in contact with the surface of the second conductive layer 3 facing the support layer 1, or the end face of the second end 42 protrudes from the second surface of the support layer 1, and a portion of the conductive member 4 is inserted into the second conductive layer 3 along the first direction X. In the subsequent process of connecting the tab 200, the second end 42 of the conductive member 4 can be directly connected to the tab 200, thereby improving the structural connection strength between the conductive member 4 and the tab 200, making it less likely for the conductive member 4 and the tab 200 to separate and cause the circuit to break, thus improving the reliability of circuit conduction.

[0060] In some embodiments, the conductive member 4 has a size of 50 μm to 90 μm along the first direction X to accommodate the support layer 1 with different thicknesses along the first direction X. The size of the conductive member 4 along the first direction X should be greater than or equal to the size of the support layer 1 along the first direction X so that the conductive member 4 can penetrate the support layer 1 and connect to the first conductive layer 2 and the second conductive layer 3 respectively, thereby realizing the circuit conduction between the first conductive layer 2 and the second conductive layer 3.

[0061] The conductive component 4 has dimensions of 0.5μm to 3μm along the second direction Y and the third direction Z to ensure that there is a suitable connection area between the conductive component 4 and the first conductive layer 2 and between the second end 42 and the second conductive layer 3, thereby improving the effectiveness of connection and circuit conduction.

[0062] This application provides a battery cell, wherein the battery cell includes a tab 200 and an electrode sheet as described above; the tab 200 is fused to a first end 41 or a second end 42 of a conductive member 4.

[0063] In some embodiments, the conductive member 4 penetrates the first conductive layer 2 or the second conductive layer 3 along the first direction X and connects to the tab 200. In some embodiments, the conductive member 4 is formed by protrusion from the surface of the tab 200, that is, the conductive member 4 and the tab 200 are integrally formed and connected, which can effectively improve the connection reliability between the conductive member 4 and the tab 200.

[0064] In some embodiments, the conductive member 4 is a burr structure protruding from the tab, which penetrates the first conductive layer 2 and the support layer 1 in a piercing manner and then connects to the second conductive layer 3, or penetrates the second conductive layer 3 and the support layer 1 in a piercing manner and then connects to the first conductive layer 2. This improves the connection reliability between the conductive member 5 and the tab 200 while simplifying the connection steps between the tab 200 and the current collector 100.

[0065] In this embodiment of the battery cell, a conductive member 4 is provided to penetrate the support layer 1, and the first end 41 of the conductive member 4 is fused to the first conductive layer 2, and the second end 42 of the conductive member 4 is fused to the second conductive layer 3. This effectively connects the first conductive layer 2 and the second conductive layer 3. In subsequent processing, the tab 200 can be welded and fixed to the conductive member 4 to achieve circuit conduction, eliminating the need for external metal foil, reducing the impact on the overall space occupied by the tab 200 area, and improving the quality of the battery cell.

[0066] like Figure 4 As shown, this application provides a method for manufacturing a battery cell, wherein the method can be used to manufacture the battery cell described above. The method for manufacturing the battery cell includes:

[0067] A support layer 1 is provided, which has a first side 11 and a second side 12 facing away from each other along the first direction X. The support layer 1 is made of an insulating polymer material.

[0068] A conductive component 4, made of metal, is provided. The conductive component 4 penetrates the support layer 1 along the first direction X, and the first end 41 of the conductive component 4 protrudes or is flush with the first surface 11, for connection and circuit conduction with the first conductive layer 2 in subsequent processes. The second end 42 of the conductive component 4 protrudes or is flush with the second surface 12, for connection and circuit conduction with the second conductive layer 3 in subsequent processes.

[0069] A first conductive layer 2 is provided, and the first end 41 of the conductive component 4 is welded to the first surface 11 and the first conductive layer 2 by pressure fusion resistance welding. A second conductive layer 3 is provided, and the second end 42 of the conductive component 4 is welded to the second surface 12 and the second conductive layer 3 by pressure fusion resistance welding, thereby realizing the structural and circuit connection between the first conductive layer 2 and the second conductive layer 3. Pressure fusion resistance welding has the advantages of high productivity, small deformation of welded parts, and easy automation.

[0070] In some embodiments, the method of manufacturing the battery cell also includes welding the first end 41 of the conductive member 4 to the tab 200 by pressure welding resistance welding, which has the advantages of high productivity, small deformation of the welded parts and easy automation.

[0071] In some embodiments, the manufacturing method of the battery cell further includes welding and fixing the second end 42 of the conductive member 4 to the tab 200 by pressure welding resistance welding. Since the conductive member 4 has a conical structure and the second end 42 is small in size, after welding the tab 200 to the second end 42 of the conductive member 4, the conical surface of the conductive member 4 has a tightening effect on the first conductive layer 2, the support layer 1 and the second conductive layer 3, which improves the connection reliability between the first conductive layer 2, the support layer 1 and the second conductive layer 3, and can reduce the possibility of delamination or separation between the first conductive layer 2, the support layer 1 and the second conductive layer 3 leading to electrical connection failure.

[0072] In some embodiments, the end face of the first end 41 of the conductive member 4 is flush with or protrudes from the surface of the first conductive layer 2 away from the support layer 1, and a portion of the conductive member 4 penetrates the first conductive layer 2, which can increase the connection area between the conductive member 4 and the first conductive layer 2 and improve the circuit conduction effect between the conductive member 4 and the first conductive layer 2.

[0073] The end face of the second end 42 of the conductive member 4 protrudes from the second surface 12, and the conductive member is at least partially inserted into or penetrates the second conductive layer 3, which can increase the connection area between the conductive member 4 and the second conductive layer 3 and improve the circuit conduction effect between the conductive member 4 and the second conductive layer 3.

[0074] In some embodiments, the method of manufacturing the battery cell further includes deburring the tab 200, so that a burr is formed on at least one side surface of the tab 200 along the first direction X, and the burr serves as a conductive member 4. In the embodiments of this application, the conductive member 4 and the tab 200 are integrally formed and connected, which can effectively improve the reliability of the structural connection and electrical connection between the tab 200 and the conductive member 4.

[0075] This application provides an electrical device, which includes the electrode or battery cell as described above.

[0076] The electrical device of this application embodiment, by setting a conductive member 4 through the support layer 1, and fusing the first end 41 of the conductive member 4 with the first conductive layer 2 and the second end 42 of the conductive member 4 with the second conductive layer 3, can effectively conduct the first conductive layer 2 and the second conductive layer 3. In the subsequent processing, the tab 200 can be connected to the conductive member 4 to realize the circuit conduction, eliminating the need for external metal foil, reducing the impact on the overall space occupied by the tab 200 area, and improving the quality of the battery cell.

[0077] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode sheet, characterized in that, The electrode includes a current collector: The current collector includes a first conductive layer, a support layer, and a second conductive layer stacked along a first direction; The support layer has a first side and a second side that are opposite to each other along the first direction; The first conductive layer is connected to the first surface; The second conductive layer is connected to the second surface; The current collector further includes a conductive member that penetrates the support layer along the first direction and is fused to the support layer; a first end of the conductive member is fused to the first conductive layer, and a second end of the conductive member is fused to the second conductive layer.

2. The electrode sheet according to claim 1, characterized in that, The conductive component is conical, with the dimension of the first end along the second direction being greater than the dimension of the second end along the second direction, and the dimension of the first end along the third direction being greater than the dimension of the second end along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

3. The electrode sheet according to claim 1 or 2, characterized in that, The end face of the first end is connected to the surface of the first conductive layer facing the support layer; Alternatively, the end face of the first end protrudes from the first surface of the support layer, and a portion of the conductive member is inserted into the first conductive layer along the first direction; Alternatively, the conductive member penetrates the first conductive layer along the first direction, and the end face of the first end is flush with the surface of the first conductive layer away from the support layer. Alternatively, the conductive member penetrates the first conductive layer along the first direction, and the end face of the first end protrudes from the surface of the first conductive layer away from the support layer.

4. The electrode sheet according to claim 1 or 2, characterized in that, The end face of the second end is connected to the surface of the second conductive layer facing the support layer; Alternatively, the end face of the second end protrudes from the second surface of the support layer, and a portion of the conductive member is inserted into the second conductive layer along the first direction; Alternatively, the conductive member penetrates the second conductive layer along the first direction, and the end face of the second end is flush with the surface of the second conductive layer away from the support layer. Alternatively, the conductive member penetrates the second conductive layer along the first direction, and the end face of the second end protrudes from the surface of the second conductive layer away from the support layer.

5. The electrode sheet according to claim 2, characterized in that, The conductive member penetrates the first conductive layer along the first direction, and the end face of the first end is flush with or protrudes from the surface of the first conductive layer away from the support layer. The end face of the second end is in contact with the surface of the second conductive layer facing the support layer, or the end face of the second end protrudes from the second surface of the support layer, and a portion of the conductive member is inserted into the second conductive layer along the first direction.

6. The electrode sheet according to claim 2, characterized in that, The first end is connected to the surface of the first conductive layer facing the support layer; or the end face of the first end protrudes from the first surface of the support layer, and a portion of the conductive member is inserted into the first conductive layer along the first direction; The conductive member penetrates the second conductive layer along the first direction, and the end face of the second end is flush with or protrudes from the surface of the second conductive layer away from the support layer.

7. The electrode sheet according to claim 1, characterized in that, The conductive component has a dimension of 50 μm to 90 μm along the first direction, and the conductive component has a dimension of 0.5 μm to 3 μm along the second and third directions; The first direction, the second direction, and the third direction are perpendicular to each other.

8. A battery cell, characterized in that, The battery cell includes: Extreme ear; and The electrode sheet as described in any one of claims 1 to 7; The electrode tab is fused to the first or second end of the conductive member.

9. The battery cell according to claim 8, characterized in that, The conductive component is connected to the tab along the first direction.

10. The battery cell according to claim 8, characterized in that, The conductive component has a burr structure that protrudes from the tab.

11. A method for manufacturing a battery cell, characterized in that, A method for manufacturing a battery cell as described in any one of claims 8 to 10, the method comprising: A support layer is provided, and along a first direction, the support layer has a first side and a second side facing away from each other; A conductive component is provided, which penetrates the support layer along the first direction, and the first end of the conductive component protrudes or is flush with the first surface, and the second end of the conductive component protrudes or is flush with the second surface. A first conductive layer is provided, and the first end of the conductive component is welded to the first surface and the first conductive layer by pressure fusion resistance welding. A second conductive layer is provided, and the second end of the conductive component is welded to the second surface and the second conductive layer by pressure fusion resistance welding. The electrode tab is welded and fixed to the conductive component by pressure fusion resistance welding.

12. The method for manufacturing a battery cell according to claim 11, characterized in that, The first end face of the conductive member is flush with or protrudes from the surface of the first conductive layer away from the support layer, and a portion of the conductive member penetrates the first conductive layer. The end face of the second end of the conductive member protrudes from the second surface, and the conductive member is partially inserted into the second conductive layer.

13. The method for manufacturing a battery cell according to claim 11, characterized in that, The method for manufacturing the battery cell further includes: The electrode tab is deburred so that burrs are formed on at least one side surface of the electrode tab along the first direction, and the burrs serve as the conductive component.

14. An electrical appliance, characterized in that, The electrical device includes the electrode as described in any one of claims 1 to 7 or the battery cell as described in any one of claims 8 to 10.

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