Electrode assembly and device for its manufacture, battery, power-consuming device

Abstract

Electrode arrangement (10) for a battery cell (100), wherein the electrode arrangement (10) comprises a first electrode foil (1) and a second electrode foil (2) having opposite polarities, wherein the first electrode foil (1) and the second electrode foil (2) each comprise a main body (11) and a tab (12) projecting from the main body (11), wherein the first electrode foil (1) and the second electrode foil (2) are wound around a winding axis (K) such that their respective main bodies (11) form a winding body (S);wherein the end of the winding body (S) comprises at least one electrically conductive area (121) and at least one liquid-conducting area (111), wherein the tab (12) extends out of the electrically conductive area (121) and is wrapped at least once and is used for electrical connection with a terminal (1022) of the battery cell (100), wherein the liquid-conducting area (111) and the electrically conductive area (121) are arranged next to each other in the radial direction of the winding body (S) and are used to guide the electrolyte solution into the interior of the winding body (S).

Description

TECHNICAL AREA

[0001] The present application relates to the field of battery technology, in particular an electrode arrangement and a device for its manufacture, a battery, and a power-consuming device. STATE OF THE ART

[0002] Due to the advantages of lithium-ion batteries, such as high energy density, high power density, long cycle life and long shelf life, they are widely used in electric vehicles.

[0003] However, improving the operational performance of batteries for electric vehicles has always posed a challenge for the industry. CONTENT OF THE PRESENT INVENTION

[0004] The aim of this application is to improve the performance of the battery.

[0005] According to a first aspect of the present application, an electrode arrangement for a battery cell is provided, wherein the electrode arrangement comprises a first electrode foil and a second electrode foil having opposite polarities, both the first electrode foil and the second electrode foil each comprising a main body and a tab projecting from the main body, wherein the first electrode foil and the second electrode foil are wound around a winding axis such that their respective main bodies form a winding body;

[0006] The end of the winding body has at least one electrically conductive area and at least one liquid-conducting area; the tab protrudes from the electrically conductive area, is wound at least once, and serves for electrical connection with the terminal of the battery cell, wherein the liquid-conducting area and the electrically conductive area are arranged next to each other in the radial direction of the winding body and are used to guide the electrolyte solution into the interior of the winding body.

[0007] This embodiment of the present application has both an electrically conductive area and a liquid-conducting area at the end of the winding body. Since no tab is provided in the liquid-conducting area, the electrolyte solution in the battery cell can easily flow into the interior of the winding body through the gap between the first and second electrode foils in the liquid-conducting area after the tab in the electrically conductive area has been flattened. This ensures the wetting properties of the electrode arrangement, so that during the charging and discharging process of the battery, the electrolyte solution reacts completely with the active substance on the first and second electrode foils, thus optimizing the performance of the battery cell.

[0008] Since the tab extends continuously and is wrapped at least once around the electrically conductive area, it exhibits good connection strength with the main body in the circumferential direction, thus providing good self-support to the tab root, preventing folding of the tab when a circumferential force is applied, stabilizing the shape of the flattened area, optimizing the welding effect between the tab and the connection, ensuring reliable transmission of electrical energy to the outside through the electrode arrangement, and improving the current-carrying capacity.Furthermore, there is a lower probability that the particles generated during welding of the tab will fall circumferentially between the first electrode foil and the second electrode foil in the fluid-conducting area, which can improve the reliability in the operation of the electrode arrangement and prevent short circuits or scratches of the electrode foil.

[0009] By providing a continuous tab along part of the winding length of the main body, the required current-carrying capacity of the tab can be achieved, eliminating the need for discrete tabs along the entire winding length of the main body and simplifying the tab punching process. Furthermore, when the first and second electrode foils are wound and formed onto the winding body, the need to address the issue of tab alignment is eliminated, simplifying the process and improving the production efficiency of the electrode assembly.

[0010] In some embodiments, the tab is wrapped multiple times in the electrically conductive area.

[0011] In this embodiment of the present application, the tabs are wrapped several times in the electrically conductive area. After the tabs have been flattened, the bent sections of adjacent tabs overlap, thereby further reinforcing the support on the tabs, preventing flattening and folding of the tabs, stabilizing the shape of the bent sections, and optimizing the welding effect between the tabs and the connection. Furthermore, this increases the welding area between the flattened tab and the connection, making the weld between the tab and the connection more robust and ensuring that the electrode arrangement reliably conducts the electrical energy to the outside, thus improving the current-carrying capacity.

[0012] In some embodiments, the sum of the number of electrically conductive areas and liquid-conducting areas is greater than or equal to three, and the electrically conductive areas and the liquid-conducting areas are arranged alternately along the radial direction of the winding body.

[0013] This embodiment of the present application, in which at least three electrically conductive areas and the liquid-conducting area are arranged alternately along the radial direction of the winding body, enables the electrolyte solution entering the interior of the winding body from the liquid-conducting area to reach the electrically conductive areas more easily, which is advantageous for rapid wetting of the electrolyte solution; in addition, this structure can shorten the transmission distance of the electrons from the liquid-conducting area to the electrically conductive area, thereby ensuring timely and effective transmission of the electrons, improving the uniformity of the current distribution and preventing polarization problems in the electrode arrangement.

[0014] In some embodiments, the electrically conductive area is located in the central region along the radial direction at the end of the winding body, and a fluid-conducting area is provided on both sides of the electrically conductive area along the radial direction.

[0015] In this embodiment of the present application, a liquid-conducting region is provided on both sides of the electrically conductive region in the radial direction. The electrolyte solution can simultaneously penetrate the interior of the winding body through these two liquid-conducting regions and reach the portions of the first and second electrode foils located within the electrically conductive region, thereby further improving the wetting properties of the electrolyte solution for the electrode arrangement. Furthermore, the electron transmission distance from the inner and outer liquid-conducting regions to the electrically conductive region can be reduced, improving the uniformity of the current distribution and preventing polarization problems. Additionally, providing a single electrically conductive region facilitates the electrical connection between the tab and the terminal.All of the above-mentioned advantages can improve battery performance.

[0016] In some embodiments, it is provided that at least one of the first electrode foil and the second electrode foil is provided with several tabs spaced at intervals in the winding direction in order to form several electrically conductive areas spaced at intervals in the radial direction at the end of the winding body.

[0017] In this embodiment of the present application, the electrolyte solution, which enters the interior of the winding body through the liquid-conducting area, is simultaneously able to penetrate the electrically conductive area on both sides, thereby allowing the electrolyte solution to reach the part of the first electrode foil and the second electrode foil that is located in the electrically conductive area, thus improving the wetting properties of the electrode arrangement by the electrolyte solution.Furthermore, electrons can simultaneously travel from the liquid-conducting area along the inner radial side and the outer radial side into the electrically conductive area, significantly reducing the electron transfer distance, improving the uniformity of the current distribution, and preventing polarization problems. If the first and second electrode foils are extended to a considerable length, the polarization problem caused by the long local electron transfer distance can be effectively avoided by designing a segmented tab. Additionally, the arrangement of multiple electrically conductive areas allows the overall length of the tab to be extended radially, facilitating the welding of the tab to the adapter and the electrical connection via the adapter. All of the above advantages can improve battery performance.

[0018] In some embodiments, two electrically conductive areas are provided and arranged radially inside and outside the ends of the winding body, respectively, and the fluid-conducting area is located between the two electrically conductive areas.

[0019] In this embodiment of the present application, two electrically conductive areas are located in non-wettable constrictions, such as in the inner ring and outer ring of the electrode arrangement, thereby optimizing the wetting effect and avoiding polarization problems.

[0020] In some embodiments, it is provided that an electrically conductive area and a liquid-conducting area are provided, and the electrically conductive area is located on the radial inside of the liquid-conducting area.

[0021] In this embodiment of the present application, the electrically conductive area is located within the liquid-conducting area. Based on the fact that the wetting properties of the electrode arrangement are ensured by the liquid-conducting area, it is also possible to prevent the tab from coming into contact with the inner wall of the housing after flattening and the formation of a bend section, or from particles falling onto the inner side wall of the housing during welding of the tab and the connection, thus preventing short circuits and improving the operational reliability of the battery cell.

[0022] In some embodiments, it is provided that the fluid-conducting areas at both ends of the winding body have the same radial dimension, and that the electrically conductive areas at both ends of the winding body have the same radial dimension.

[0023] In this embodiment of the present application, the structures at both ends of the winding body are symmetrical, and the first electrode foil and the second electrode foil can be processed into the same structure, which reduces the processing difficulty of the electrode arrangement and improves the production efficiency of the electrode arrangement.

[0024] In some embodiments, the fluid-conducting area at one end of the winding body has the same radial dimension as the electrically conductive area at the other end.

[0025] In this embodiment of the present application, the electrically conductive area and the liquid-conducting area are arranged radially offset at both ends of the winding body S, i.e., the electrically conductive area at one end of the winding body corresponds to the liquid-conducting area at the other end. In this way, the winding body has a liquid-conducting area at every position along the radial direction, which allows the electrolyte solution to penetrate the interior of the winding body more quickly and completely and to make the distribution of the electrolyte solution within the electrode arrangement more uniform, so that during the charging and discharging process of the battery, the electrolyte solution reacts uniformly with the active substance on the first electrode foil and the second electrode foil, thus optimizing the performance of the battery cell.

[0026] In some embodiments, the electrode arrangement also includes a separator for separating the first electrode foil from the second electrode foil; the separator, the main body of the first electrode foil, and the main body of the second electrode foil are wound up and then form the winding body.

[0027] In the direction of extension of the winding axis, the part of the separator located in the fluid-conducting area projects beyond the side of the main body of the first electrode foil and the side of the main body of the second electrode foil.

[0028] In this embodiment of the present application, the separator is designed in a stepped form; by extending the liquid-conducting area, the sides of the separator can extend outwards between the first electrode foil and the second electrode foil and immerse themselves in the electrolyte solution, thereby enabling the separator to more easily absorb the electrolyte solution by capillary action, which improves the wetting properties of the electrode arrangement and thus increases the performance of the battery cell.

[0029] In some embodiments, the electrode arrangement also includes a separator for separating the first electrode foil from the second electrode foil. The main body comprises at least one active substance region and a flow guidance region, arranged side by side along the extension direction of the winding axis, with the flow guidance region being located outside the active substance region. The gap between the surface of the main body in the flow guidance region and the separator is larger than the gap between the surface of the main body in the active substance region and the separator.

[0030] In this embodiment of the present application, the gap between the surface of the main body in the flow-guiding region and the separator is larger than the gap between the surface of the main body in the active substance region and the separator, thus creating a larger capillary gap between the flow-guiding region and the separator. Once the electrolyte solution is drawn into the end of the separator, it allows the rapid entry of the electrolyte solution into the end of the winding body and from there into the active substance region to react with the active substance. This design gradually reduces the gap between the main body and the separator from the outside in, facilitating the rapid entry of the electrolyte solution.

[0031] In some embodiments, the flow guidance area of ​​at least one of the first electrode foil and the second electrode foil includes a wetting area adjacent to the active substance area, and the gap between the surface of the main body located in the wetting area and the separator gradually increases from the inside out along the direction of extension of the winding axis.

[0032] This embodiment of the present application makes it possible to draw the electrolyte solution into the end of the separator and then introduce it through the wetting area into the active substance area, thereby facilitating the rapid penetration of the electrolyte solution into the interior of the winding body for reaction.

[0033] In some embodiments, the flow guidance area comprises a wetting area adjacent to the active substance area, comprising at least one of the first electrode foil and the second electrode foil, and the main body comprises a current collector, an active substance layer, and a wetting layer, wherein the active substance layer is arranged on the surface of the current collector and is located in the active substance area, the wetting layer is located on the surface of the current collector and in the wetting area, and the liquid absorption capacity of the wetting layer is higher than that of the active substance layer.

[0034] In this embodiment of the present application, the wetting layer with a higher liquid absorption capacity than the active substance layer is applied to an area of ​​the main body facing the outside; the material properties of the wetting layer improve the ability of the end of the winding body to absorb the electrolyte solution, so that the electrolyte solution is quickly drawn into the interior of the winding body.

[0035] In some embodiments, the wetting layer is provided to comprise an inorganic ceramic coating, a polymer and an adhesive.

[0036] In some embodiments, it is provided that the flow guidance area of ​​at least one of the first electrode foil and the second electrode foil also includes a guidance area that forms in the area where the current collector extends along the direction of extension of the winding axis beyond the wetting layer.

[0037] In this embodiment of the present application, no coating layer is provided in the guide area, whereby the gap between the current collector in the guide area and the separator is larger than the gap between the surface of the wetting layer and the separator. This allows the formation of multi-stage channels for the absorption of the electrolyte solution at the end of the winding body, which is located in the liquid-conducting area. Furthermore, the distance between the first electrode foil or the second electrode foil and the separator gradually decreases from the guide area and the wetting area towards the active substance area, which can significantly increase the liquid absorption efficiency and improve the wetting properties of the electrode arrangement, thus improving the performance of the battery cell.

[0038] In some embodiments, the first electrode foil is a cathode foil and is successively provided with an active substance area, a wetting area and a guide area from the inside out along the direction of the winding axis, wherein the second electrode foil is an anode foil and is successively provided with an active substance area and a guide area from the inside out along the winding axis.

[0039] This embodiment of the present application takes into account that the cathode foil has a relatively high density and the electrolyte solution penetrates the cathode foil relatively slowly. By adding the wetting area on the cathode foil, the rate at which the electrolyte solution penetrates the active cathode material can be accelerated. The electrolyte solution then enters the anode foil more quickly than the cathode foil, and guiding the electrolyte solution exclusively through the guiding area simplifies the manufacturing process of the anode foil. This embodiment allows the rate at which the electrolyte solution enters the cathode foil and the anode foil to be made approximately equal, thus reducing the production difficulty of the electrode assembly.

[0040] In some embodiments, it is provided that the side of the separator located in the fluid-conducting area of ​​at least one of the first electrode foil and the second electrode foil is located between the outside of the flow guidance area and the outside of the tab.

[0041] In this embodiment of the present application, the side of the separator projects beyond the outside of the flow guidance area, so that the projecting part of the separator can immerse itself in the electrolyte solution to draw in the electrolyte solution by capillary action; furthermore, the side of the separator does not project beyond the outside of the tab, thus preventing the separator from extending too far into the electrically conductive area, which would impair the flattening of the tab and ensure the electrical conductivity of the tab.

[0042] In some embodiments, it is provided that the extension length of the flow guidance area, which extends circumferentially around the winding body, corresponds to the active substance area.

[0043] This embodiment of the present application can reduce the manufacturing difficulties of the electrode foil with the flow guidance area, and the extension length of the flow guidance area corresponds to the extension length of the active substance area, thereby enabling the electrolyte solution to be effectively guided to the active substance area along the entire coating length of the active substance area, ensuring that the electrolyte solution is distributed uniformly over the entire winding length of the electrode foil, thereby improving the performance of the battery cell.

[0044] According to a second aspect of the present application, a battery cell is provided comprising: a housing with an opening; an end cap component for closing an opening, the end cap component comprising an end cap body and a terminal arranged on the end cap body; and an electrode arrangement of the above embodiment, arranged in the housing, the tabs of the first electrode foil or the second electrode foil being electrically connected to the terminal.

[0045] In the battery cell of this embodiment of the present application, the performance of the battery cell can be improved because the electrode arrangement has better wetting properties and the tabs and the connection have a higher electrical connection reliability.

[0046] According to a third aspect of the present application, a battery is provided comprising: the battery cell described in the above embodiment; and the box that serves to hold the battery cell.

[0047] According to a fourth aspect of the present application, a power-consuming device is provided which uses the battery of the embodiment described above, wherein the battery serves to supply electrical energy to the power-consuming device.

[0048] A method for manufacturing an electrode array is provided, which includes the following:

[0049] Providing a first electrode foil and a second electrode foil having opposite polarities, both the first electrode foil and the second electrode foil each comprising a main body and a tab extending from the main body;

[0050] the first electrode foil and the second electrode foil are wound around the winding axis, so that their respective main bodies form a winding body, the end of the winding body includes at least one electrically conductive area and at least one fluid-conducting area;

[0051] The tab is led out of the electrically conductive area and wrapped at least once and serves for electrical connection with the terminal of the battery cell; the liquid-conducting area and the electrically conductive area are arranged next to each other along the radial direction of the winding body and serve to guide the electrolyte solution into the interior of the winding body.

[0052] According to a fifth aspect of the present application, a manufacturing device for the battery is provided, comprising the following: an electrode foil delivery device configured to deliver a first electrode foil and a second electrode foil of opposite polarity, both the first electrode foil and the second electrode foil each comprising a main body and a tab projecting from the main body; and an electrode foil winding device configured such that the first electrode foil and the second electrode foil are wound around the winding axis, so that their respective main bodies form a winding body, the end of the winding body comprising at least one electrically conductive area and at least one fluid-conducting area; The tab is led out of the electrically conductive area and wrapped at least once and serves for electrical connection with the terminal of the battery cell; the liquid-conducting area and the electrically conductive area are arranged next to each other along the radial direction of the winding body and serve to guide the electrolyte solution into the interior of the winding body. BRIEF DESCRIPTION OF THE DRAWING

[0053] To more clearly explain the technical solutions and embodiments of the present application, the drawings that must be used in embodiments of the present application are briefly described below. Obviously, the accompanying drawings in the following description represent only some embodiments of the present application, and other drawings can be derived from them without any creative effort by the person skilled in the art. Fig. Figure 1 is a schematic structural representation of some embodiments of the present application for installing the battery in the vehicle. Fig. Figure 2 is an exploded view of some embodiments of the battery of the present application. Fig. Figure 3 is a schematic structural representation of some embodiments of the battery cell in the battery of the present application. Fig. Figure 4 is a first exploded view of some embodiments of the battery cell in the battery of the present application. Fig. Figure 5 is a second exploded view of some embodiments of the battery cell in the battery of the present application. Fig. Figure 6 is a sectional view of the first embodiment of the battery of the present application. Fig. Figure 7 is a schematic representation of the end surface of the electrode arrangement in the Fig. 6 shown battery. Fig. Figure 8 is a sectional view of the second embodiment of the battery of the present application. Fig. Figure 9 is a schematic representation of the end surface of the electrode arrangement in the Fig. Battery shown in section 8. Fig. Figure 10 is a sectional view of the third embodiment of the battery of the present application. Fig. Figure 11 is a schematic representation of the end surface of the electrode arrangement in the Fig. 10 batteries shown. Fig. 12A, Fig. 12B and Fig. Figures 12C are schematic structural representations of the first electrode foil, the second electrode foil and the separator in some embodiments of the electrode arrangement. Fig. 13A, Fig. 13B and Fig. Figures 13C are schematic structural representations of the first electrode foil, the second electrode foil and the separator in some other embodiments of the electrode arrangement. Fig. 14A, Fig. 14B and Fig. Figures 14C are schematic structural representations of the first electrode foil, the second electrode foil and the separator in some further embodiments of the electrode arrangement. Fig. Figure 15 is a schematic structural representation of the first electrode foil in the battery of the first embodiment, which is described in Fig. 6 is shown. Fig. Figure 16 is a schematic structural representation of the first electrode foil in the battery of the second embodiment, which is described in Fig. 8 is shown. Fig. Figure 17 is a schematic structural representation of the side surface in some embodiments of the first electrode foil. Fig. Figure 18 is a schematic structural representation of the side surface in some other embodiments of the first electrode foil. Fig. Figure 19 is a schematic structural representation of some embodiments in which the first electrode foil, the second electrode foil and the separator are stacked on top of each other before winding. Fig. Figure 20 is a schematic flowchart for some embodiments of the method for manufacturing the electrode arrangement. Fig. Figure 21 is a schematic representation of the module composition of some embodiments of the device for manufacturing the electrode arrangement of the present application. The dimensions in the drawings are not shown in actual proportion.

[0054] Explanation of reference symbols: 10. Electrode array; 1. First electrode foil; 11. Main body section; 111. Liquid-conducting area; 112. Active substance layer; 113. Wetting layer; 114. Current collector; 12. Tab; 121. Electrically conductive area; 122. Transition section; 2. Second electrode foil; 3. Separator; 100. Battery cell; 101. Housing; 1011. Opening; 102. End cap component; 1021. End cap body; 1022. Connector; 1023. Pressure relief component; 1024. Insulating element; 1024'. Protruding section; 1025. Adapter; 1025A. First connector; 1025B. Second connector; 200. Battery; 201. A box; 201A. Recording section; 201B. First cover body; 201C. Second cover body; 300. Vehicle; 301. Axle; 302. Wheel; 303. Engine; 304. Control; 400. Manufacturing device; 410. Electrode foil supply device; 420. Electrode foil winding device; S. Winding body; K. Winding axis; A. Active substance area; B. Flow guidance area; B1. Wetting area; B2. Guidance area. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described below with reference to the accompanying drawings and exemplary embodiments. The following detailed description and the accompanying drawings of the exemplary embodiments serve to illustrate the principles of the present application by way of example; however, they should not be used to limit the scope of the present application, i.e., the present application is not limited to the described exemplary embodiments.

[0056] In describing the present application, it should be noted that, unless otherwise stated, "several" means two or more; the orientations or positional relationships indicated by the terms "top", "bottom", "left", "right", "inside", "outside" and the like are merely for the purpose of simplifying the description of the present application, they are not intended to indicate or imply that the device or element referred to must have a particular orientation or be designed and operated in a particular orientation, and are therefore not to be understood as limiting the present application.

[0057] Furthermore, the terms "first," "second," and "third," and the like, are used for descriptive purposes only and should not be understood as indicating or implying a relative meaning. "Vertical" does not mean vertical in the strict sense, but rather within the range of permissible error tolerance. "Parallel" does not mean parallelism in the strict sense, but rather within the range of permissible error tolerance. The directional terms used in the following description refer to the directions shown in the figure and are not intended to restrict the specific structure of the present application.

[0058] In describing the present application, it should also be noted that the terms "installation", "connecting", and "connecting", unless expressly stated otherwise and limited, are to be understood in the broadest sense; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via an intermediate medium. The person skilled in the art in this field will be able to understand the specific meanings of the foregoing terms in the present application according to specific situations.

[0059] The reference herein to an “embodiment” means that a particular feature, structure, or property described in connection with that embodiment may be included in at least some embodiments of the present application. The occurrence of this phrase at various points in the description does not necessarily all refer to the same embodiment, nor is it an independent or alternative embodiment that mutually excludes other embodiments. It is expressly and implicitly clear to those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0060] In the description of embodiments of the present application, the term “several” refers to more than two (including two), likewise “several groups” refers to more than two groups (including two groups) and “several pieces” refers to more than two pieces (including two pieces).

[0061] In the present application, descriptions of orientations or positional relationships such as "top", "bottom", "upper side", "lower side", "front", "back", "inside" and "outside" are used; this serves only to simplify the description of the present application; they are not intended to indicate or imply that the device referred to must have a particular orientation or be designed and operated in a particular orientation, and are therefore not to be understood as limiting the scope of protection of the present application.

[0062] The battery cell may, for example, comprise a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and the like, the embodiments of which are not limited thereto. The battery cell may have the form of a circular cylinder, a flat body, a cuboid, or other shapes, and the embodiments of which are not limited thereto. Battery cells are generally classified into three types according to the type of encapsulation: cylindrical battery cells, square battery cells, and softpack battery cells, and the embodiments of which are not limited thereto.

[0063] A modern battery cell typically comprises a casing and an electrode assembly housed within the casing, the casing being filled with an electrolyte. The electrode assembly is primarily formed by stacking or winding a first electrode foil and a second electrode foil of opposite polarity, usually with a separator between the first and second electrode foils. The portions of the first and second electrode foils coated with the active substance form the main body of the electrode assembly, while the portions of the first and second electrode foils not coated with the active substance form the first and second tabs, respectively.In a lithium-ion battery, the first electrode foil can be a cathode foil comprising a cathode current collector and an active cathode material layer arranged on both sides of the cathode current collector. The material of the cathode current collector can be, for example, aluminum, and the active cathode material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, or the like. The second electrode foil can be an anode foil comprising an anode current collector and an active anode material layer arranged on both sides of the anode current collector. The material of the anode current collector can be, for example, copper, and the active anode material can be, for example, graphite or silicon. The first and second tabs can be arranged either together at one end of the main body or at two ends of the main body.During the charging and discharging process of the battery cell, the active cathode substance and the active anode substance react with the electrolyte solution, and the tab is connected to the terminal to form an electrical circuit.

[0064] During the processing and assembly of electrode arrays, a large gap forms between adjacent tabs when the electrode foil is welded after winding, and the overall structure is relatively loose. This can lead to incomplete welds and burst points during laser welding. Therefore, it is often necessary to flatten the tabs so they can be bent and deformed, making adjacent tabs more compact. This facilitates the connection between the tab and the terminal and simplifies battery cell assembly. To facilitate the application of an external force to the tab for flattening along the circumference of the electrode array, the tab is generally designed to extend continuously over the entire winding length of the electrode foil.

[0065] The inventors of the present application have found in practice that flattening the tab causes the ends of two adjacent tab layers to come together tightly in a laminated structure, forming a closed structure. Such a closed structure, in a sense, obstructs the path of the electrolyte solution from the outside of the tab into the main body and thus impairs the wetting effect of the electrolyte solution on the active substance in the electrode arrangement. This can lead to insufficient participation of the active cathode substance or active anode substance in the reaction, which potentially impairs the efficiency of the electrode arrangement and thus the battery performance.

[0066] Therefore, the wetting effect of the electrolyte solution on the active substance in the electrode assembly is a crucial factor in ensuring the battery's high performance. The inventors intended to improve the wetting effect by changing the separator material or layer structure; however, this would increase the cost of the electrode assembly and complicate the manufacturing process.

[0067] Another idea is to punch the continuous tab to create several discrete tabs, which are then coiled together to form a stack of tabs. After flattening the tabs, a tabbed area and a tabless area are created around the circumference of the electrode assembly. The tabless area is easily wetted with the electrolyte solution, while the tabbed area serves to connect to the terminal. However, wrinkles form when the tab is flattened after punching. Furthermore, because the tab material is relatively soft, it cannot achieve self-supporting action at the tab root when flattened under circumferential force. This leads to uneven flattening of the flattened area and impairs the subsequent welding effect. In addition, particles generated during tab welding can easily fall between the electrode foils in the tabless area.

[0068] Based on the discovery of the aforementioned problems, the inventors of the present application have improved the structural design of the electrode arrangement in order to enhance the wetting effect of the electrolyte solution on the active substance in the electrode arrangement and to increase the battery's performance. The respective embodiments of the present application are described in more detail below with reference to the accompanying drawings.

[0069] The power-consuming device includes the battery that supplies electrical energy to the device; the device may be a mobile phone, a portable device, a laptop, an electric motorcycle, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool, or the like; for example, a spacecraft includes airplanes, rockets, spaceships, and spacecraft, and so on; an electric toy includes stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and so on; an electric tool includes electric tools for cutting metal, electric tools for grinding, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0070] As in Fig. As shown in Figure 1, the power-consuming device can be a vehicle 300, for example, a vehicle with a new energy source, which may be a purely electric vehicle, a hybrid vehicle, a range-extended vehicle, or the like; alternatively, the power-consuming device could also be a drone, a ship, or the like. Specifically, the vehicle 300 can comprise an axle 301, wheels 302 connected to the axle 301, a motor 303, a controller 304, and a battery 200. The motor 303 drives the axle 301 to rotate, the controller 304 controls the operation of the motor 303, and the battery 200 can be located at the bottom, front, or rear of the vehicle 300 to supply power to the operation of the motor 303 and other components in the vehicle.

[0071] As in Fig. As shown in Figure 2, the battery 200 comprises a box 201 and a battery cell 100. The battery 100 can contain one or more battery cells 100. If multiple battery cells 100 are present, these battery cells 100 can be connected in series, parallel, or mixed configurations. A mixed configuration means that multiple battery cells 100 contain both series and parallel connections. Multiple battery cells 100 can first be connected in series, parallel, or mixed configurations to form a battery module. Subsequently, the multiple battery modules can again be connected in series, parallel, or mixed configurations to form a whole and housed in a box 201. Alternatively, all battery cells 100 can be directly connected in series, parallel, or mixed configurations, and then the entire battery module consisting of all battery cells 100 is housed in the box 201.

[0072] The interior of the box 201 is hollow and serves to hold one or more battery cells 100. Depending on the shape, number, combination, and other requirements of the battery cells 100 held, the box 201 can also have different shapes and sizes. For example, the box 201 can comprise: a receiving section 201A, a first cover body 201B, and a second cover body 201C. The two opposite ends of the receiving section 201A each have an opening. The first cover body 201B and the second cover body 201C each serve to close the openings at both ends of the receiving section 201A. Fig. 2 shows the recording section 201A as a rectangular-cylindrical structure according to the arrangement of the several battery cells 100.

[0073] As in Fig. As shown in Figure 3, the battery cell 100 comprises a housing 101, an end cap component 102 and an electrode assembly 10. The battery cell 100 can be, for example, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a magnesium-ion battery, or the like.

[0074] The housing 101 is a hollow structure that serves to accommodate the electrode arrangement 10, and the housing 101 has an opening 1011; the end cap component 102 serves to close the opening 1011, the end cap component 102 comprises an end cap body 1021 and a connection 1022 arranged on the end cap body 1021, the end cap body 1021 is also provided with a pressure relief component 1023 that reduces the pressure when the internal pressure of the battery cell 100 exceeds a preset value.

[0075] Fig. Figure 3 shows an embodiment with only one electrode arrangement 10. It is understood by those skilled in the art that in other embodiments the battery cell 100 can also comprise several electrode arrangements 10, and the terminal 1022 can also be designed according to the number and arrangement of the electrode arrangements 10. Furthermore, depending on the shape and arrangement of the electrode arrangements 10, as well as the combination of several electrode arrangements 10, the housing 101 can take the form of a circular cylinder, a flat body, a cuboid, or other shapes.

[0076] As in Fig. As shown in Figure 4, the electrode assembly 10 is arranged inside the housing 101, and the first electrode foil and the second electrode foil of opposite polarity each have a tab 12, wherein the tab 12 of the first electrode foil or the tab 12 of the second electrode foil is electrically connected to the terminal 1022. The end cap component 102 may also include an adapter 1025, wherein the adapter 1025 is arranged between the end cap body 1021 and the electrode assembly 10 to establish the electrical connection between the tab 12 and the terminal 1022. As shown in Figure 4, the electrode assembly 10 is arranged inside the housing 101, and the electrode assembly 10 has a tab 12. Fig. As shown in Figure 5, the end cap component 102 can also include an insulating element 1024 arranged between the end cap body 1021 and the adapter 1025 to achieve insulation between the end cap body 1021 and the adapter 1025.

[0077] In the Fig. 4 and Fig. In the five illustrated embodiments, the housing 101 of the battery cell 100 is a hollow cylinder with an opening 1011 at each end, both openings being closed by the end cap component 102. The electrode assembly 10 can be inserted into the housing 101 through the opening 1011. The first electrode foil and the second electrode foil are wound together to form a circular cylindrical electrode assembly 10. The respective tabs 12 of the first electrode foil and the second electrode foil extend from the two axial ends of the electrode assembly 10 and are each electrically connected to the terminal 1022 at the respective end via the adapter 1025.

[0078] In other optional embodiments, the housing 101 of the battery cell 100 is a hollow cylinder that is closed at one end and has an opening 1011 at the other end, which is closed by the end cap component 102. The first electrode foil and the second electrode foil are wound together to form a circular cylindrical electrode arrangement 10. The respective tabs 12 of the first electrode foil and the second electrode foil extend axially from both ends of the electrode arrangement 10, the tab 12 of the first electrode foil, for example the anode foil, being electrically connected to the terminal 1022 via the adapter 1025, and the tab 12 of the second electrode foil, for example the cathode foil, being directly electrically connected to the end wall of the housing 101.

[0079] The structure of the electrode arrangement 10 is described in detail below.

[0080] In some embodiments, such as in the Fig. As shown in Figures 6 to 11, the electrode arrangement 10 is intended to be used for a battery cell 100, wherein the electrode arrangement 10 comprises a first electrode foil 1 and a second electrode foil 2 having opposite polarities, wherein the first electrode foil 1 and the second electrode foil 2 each comprise a main body 11 and a tab 12 projecting from the main body 11, wherein the first electrode foil 1 and the second electrode foil 2 are wound around the winding axis K such that their respective main bodies 11 form a winding body S.

[0081] The end of the winding body S comprises at least one electrically conductive area 121 and at least one liquid-conducting area 111, the tab 12 protrudes from the electrically conductive area 121, wraps around at least once and serves for electrical connection with the terminal 1022 of the battery cell 100, wherein the liquid-conducting area 111 and the electrically conductive area 121 are arranged next to each other in the radial direction of the winding body S and are used to guide the electrolyte solution into the interior of the winding body S.

[0082] The first electrode foil 1 and the second electrode foil 2 have essentially the same shape and can have elongated, strip-like structures. The first electrode foil 1 and the second electrode foil 2 are stacked one on top of the other in a direction perpendicular to the winding axis K, and the resulting winding body S can be a circular cylinder, a flat body, a cuboid, or another shape. For example, the first electrode foil 1 is the cathode foil and the second electrode foil 2 is the anode foil; alternatively, the first electrode foil 1 can be the anode foil and the second electrode foil 2 the cathode foil. The electrode arrangement 10 also includes a separator 3, the separator 3 serving to separate the first electrode foil 1 from the second electrode foil 2. The separator 3, the main body 11 of the first electrode foil 1, and the main body of the second electrode foil 2 are entangled together, thus forming the winding body S.

[0083] Alternatively, one end of the winding body S has at least one electrically conductive region 121 and at least one fluid-conducting region 111. The tab 12 extends from the electrically conductive region 121 and is wrapped around it at least once, so that both the electrically conductive region 121 and the fluid-conducting region 111 form a ring structure. After the tab 12 is flattened, it forms a bend and is electrically connected to the terminal 1022 of the battery cell 100 via this bend, for example by welding. When the first electrode foil 1 or the second electrode foil 2 is unfolded, the tab 12 can be located in the middle region, in the end region, or in other regions of the foil.

[0084] The fluid-conducting area 111 is not provided with a tab 12, and the gap between the first electrode foil 1 or the second electrode foil 2 and the separator 3 is connected to the outside of the electrode arrangement 10, which makes it easier for the electrolyte solution to enter the gap between the first electrode foil 1 or the second electrode foil 2 and the separator 3 and to flow into the interior of the winding body S. The separator 3 can also fully perform its fluid absorption function, so that during the charging and discharging process of the battery, the electrolyte solution reacts completely with the active substance on the first electrode foil 1 and the second electrode foil 2.

[0085] Alternatively, both ends of the winding body S have at least one electrically conductive area 121 and at least one liquid-conducting area 111, the electrolyte solution can wet the interior from the liquid-conducting area 111 at both ends of the winding body S, thereby shortening the wetting path of the electrolyte solution and improving liquid absorption.

[0086] This embodiment of the present application has both an electrically conductive area 121 and a liquid-conducting area 111 at the end of the winding body S. Since no tab 12 is provided in the liquid-conducting area 111, the electrolyte solution in the battery cell 100 can easily flow into the interior of the winding body S through the gap between the first electrode foil 1 and the second electrode foil 2 in the liquid-conducting area 111 after the tab 12 in the electrically conductive area 121 has been flattened. This ensures the wetting properties of the electrode arrangement 10, so that during the charging and discharging process of the battery the electrolyte solution reacts completely with the active substance on the first electrode foil 1 and the second electrode foil 2, thus optimizing the performance of the battery cell 100.

[0087] Since the tab 12 extends continuously and is wrapped at least once around the electrically conductive area 121, it has a good connection strength with the main body 11 in the circumferential direction, which gives the base of the tab 12 good self-support, prevents folding of the tab 12 when smoothing it by applying a circumferential force, stabilizes the shape of the flattened area, optimizes the welding effect between the tab 12 and the connection 1022, ensures the reliable transmission of electrical energy to the outside through the electrode arrangement 10, and improves the current-carrying capacity.Furthermore, the probability is lower that the particles generated during welding of the tab 12 will fall in the circumferential direction between the first electrode foil 1 and the second electrode foil 2 in the fluid-conducting area 111, which can improve the reliability in the operation of the electrode arrangement 10 and prevent short circuits or scratches of the electrode foil.

[0088] By providing a continuous tab 12 along part of the winding length of the main body 11, the current-carrying capacity of the tab 12 can be achieved, thus eliminating the need for discrete tabs 12 along the entire winding length of the main body 11 and simplifying the stamping process of the electrode foil. When the first electrode foil 1 and the second electrode foil are wound and formed onto the winding body S, the need to align the tabs 12 is eliminated, simplifying the process and improving the production efficiency of the electrode assembly 10.

[0089] In some embodiments, such as in the Fig. As shown in Figures 6 to 11, the tab 12 is designed to be wound multiple times in the electrically conductive area 121. The tab 12 can be wound for at least two turns. To achieve, for example, better self-supporting capacity of the tab 12, the number of turns should be at least five; the number of turns can be designed according to the current-carrying capacity and the polarization of the electrode arrangement 10.

[0090] In this embodiment of the present application, the tabs 12 are wrapped several times in the electrically conductive area 121. After the tabs 12 have been flattened, the bent sections of adjacent tabs 12 overlap, thereby further reinforcing the support on the tabs 12, preventing flattening and folding of the tabs, stabilizing the shape of the bent sections, and optimizing the welding effect between the tabs 12 and the terminal 1022. Furthermore, this increases the welding area between the flattened tab 12 and the terminal 1022, making the weld between the tab 12 and the terminal 1022 more robust and ensuring that the electrode arrangement 10 reliably conducts the electrical energy to the outside and improving the current-carrying capacity.

[0091] In some embodiments, the sum of the number of electrically conductive areas 121 and the number of liquid-conducting areas 111 is greater than or equal to three, and the electrically conductive areas and the liquid-conducting areas are arranged alternately along the radial direction of the winding body S. As in Fig. 6 and Fig. Figure 7 shows a single electrically conductive area 121 and two liquid-conducting areas 111; as shown in Fig. 8 and Fig. Figure 9 shows two electrically conductive areas 121 and a single liquid-conducting area 111.

[0092] This embodiment of the present application, in which at least three electrically conductive areas 121 and the liquid-conducting area 111 are arranged alternately along the radial direction of the winding body S, enables the electrolyte solution entering the interior of the winding body S from the liquid-conducting area 111 to reach the electrically conductive areas 121 more easily, which is advantageous for rapid wetting of the electrolyte solution; in addition, this structure can shorten the transmission distance of the electrons from the liquid-conducting area 111 to the electrically conductive area 121, thereby ensuring timely and effective transmission of the electrons, improving the uniformity of the current distribution and preventing polarization problems in the electrode arrangement 10.

[0093] In some embodiments, such as in the Fig. 6 and Fig. As shown in Figure 7, the electrically conductive area 121 is located in the central area along the radial direction at the end of the winding body S, and a fluid-conducting area 111 is provided on each side of the electrically conductive area 121 along the radial direction.

[0094] The term "central area" does not mean that it is located exactly in the middle along the radial direction; the position of the electrically conductive area 121, whether directed radially inwards or outwards, falls within the scope of protection of the present application.

[0095] In this embodiment of the present application, a liquid-conducting region 111 is provided on both sides of the electrically conductive region 121 in the radial direction. The electrolyte solution can simultaneously penetrate through these two liquid-conducting regions 111 into the interior of the winding body S and reach the parts of the first electrode foil 1 and the second electrode foil 2 located in the electrically conductive region 121, thereby further improving the wetting properties of the electrolyte solution of the electrode arrangement 10. Furthermore, the transmission distance of the electrons from the inner liquid-conducting region 111 and the outer liquid-conducting region 111 to the electrically conductive region 121 can be shortened, which improves the uniformity of the current distribution and prevents polarization problems.Furthermore, a single electrically conductive area 121 is provided to facilitate the electrical connection between the tab 12 and the terminal 1022. All of the above advantages can improve battery performance.

[0096] In some embodiments, such as in the Fig. 8 and Fig. As shown in Figure 9, it is provided that at least one of the first electrode foil 1 and the second electrode foil 2 is provided with several tabs 12 spaced apart in the winding direction in order to form several electrically conductive areas 121 spaced apart in the radial direction at the end of the winding body S.

[0097] In the direction of extension of the winding axis K, one side of the main body 11 is provided with at least one of the first electrode foil 1 and the second electrode foil 2 at intervals with two or more tabs 12, each tab 12 forming an electrically conductive area 121 at the end of the winding body S, wherein the electrically conductive area 121 and the fluid-conducting area 111 are arranged alternately in the radial direction. For example, the number of segments of the tab 12 may not exceed ten, depending on the length of the electrode foil.In this embodiment of the present application, the electrolyte solution, which enters the interior of the winding body S through the liquid-conducting area 111, is simultaneously able to penetrate the electrically conductive area 121 on both sides, thereby allowing the electrolyte solution to reach the part of the first electrode foil 1 and the second electrode foil 2 that is located in the electrically conductive area 121, thus improving the wetting properties of the electrode arrangement 10 by the electrolyte solution.Furthermore, electrons can simultaneously travel from the liquid-conducting region 111 along the inner radial side and the outer radial side into the electrically conductive region 121, which significantly reduces the electron transmission distance, improves the uniformity of the current distribution, and prevents polarization problems. If the first electrode foil 1 and the second electrode foil 2 are extended to a considerable length, the polarization problem caused by the long local electron transmission distance can be effectively avoided by designing segmented tabs 12. Moreover, by providing multiple electrically conductive regions 121, the overall length of the tab 12 can be extended in the radial direction, which facilitates welding the tab 12 to the adapter 1025 and electrically connecting it to the terminal 1022 via the adapter 1025.All of the above-mentioned advantages can improve battery performance.

[0098] In some embodiments, such as in the Fig. 8 and Fig. As shown in Figure 9, it is provided that two electrically conductive areas 121 are provided and are located on the inside and outside of the end of the winding body S in a radial direction, the fluid-conducting area 111 is located between the two electrically conductive areas 121.

[0099] The wetting rate varies at different points of the electrode arrangement 10; for example, the parts of the electrode arrangement 10 that are closest to the inner ring and the outer ring are relatively easily wetted with the electrolyte solution. The inner ring is supplied with the electrolyte solution via the central tube, while the outer ring comes into contact with the electrolyte solution via the gap between the housing 101 and the electrode arrangement 10. Therefore, the inner ring and the outer ring of the electrode arrangement 10 are more easily immersed in the electrolyte solution than the central area.

[0100] In this embodiment of the present application, two electrically conductive areas 121 are located in non-wettable constrictions, such as in the inner ring and outer ring of the electrode arrangement 10, thereby optimizing the wetting effect and avoiding polarization problems.

[0101] In some embodiments, such as in the Fig. 10 and Fig. As shown in Figure 11, it is provided that an electrically conductive region 121 and a liquid-conducting region 111 are each provided, wherein the electrically conductive region 121 is located on the radial inside of the liquid-conducting region 111. For example, the radial width of the electrically conductive region 121 can be larger than that of the liquid-conducting region 111 to improve the current-carrying capacity of the electrode arrangement 10.

[0102] In this embodiment of the present application, the electrically conductive area 121 is arranged on the inside of the liquid-conducting area 111, whereby, on the basis that the wetting properties of the electrode arrangement 10 are ensured by the liquid-conducting area 111, it is also possible to prevent the tab 12 from coming into contact with the inner wall of the housing 101 after flattening and forming a bend section, or, during the welding of the tab 12 and the connection 1022, to prevent particles from falling onto the inner side wall of the housing 101 in order to avoid a short-circuit event and to increase the operational safety of the battery cell 100.

[0103] In some embodiments, the fluid-conducting areas 111 at both ends of the winding body S have the same radial dimension, and the electrically conductive areas 121 at both ends of the winding body S also have the same radial dimension. The tabs 12 of the first electrode foil 1 and the second electrode foil 2 are each derived from the two ends of the winding body S. An electrically conductive area 121 and a fluid-conducting area 111 are provided at both ends of the winding body S; the "radial dimensions" include the radial position and the radial size.

[0104] In this embodiment of the present application, the structures at both ends of the winding body S are symmetrical, and the first electrode foil 1 and the second electrode foil 2 can be processed into the same structure, which reduces the processing difficulty of the electrode arrangement 10 and improves the production efficiency of the electrode arrangement 10.

[0105] In further embodiments, the fluid-conducting area (111) at one end of the winding body (S) and the electrically conductive area (121) at the other end have the same radial dimensions. The tabs 12 of the first electrode foil 1 and the second electrode foil 2 are each derived from the two ends of the winding body S. An electrically conductive area 121 and a fluid-conducting area 111 are provided at both ends of the winding body S. The "radial dimensions" include the radial position and the radial size.

[0106] In this embodiment of the present application, the electrically conductive area 121 and the liquid-conducting area 111 are arranged radially offset at both ends of the winding body S, i.e., the electrically conductive area 121 at one end of the winding body S corresponds to the liquid-conducting area 111 at the other end. In this way, the winding body S has a liquid-conducting area 111 at every position along the radial direction, which allows the electrolyte solution to penetrate the interior of the winding body S more quickly and completely and to make the distribution of the electrolyte solution within the electrode arrangement 10 more uniform, so that during the charging and discharging process of the battery, the electrolyte solution reacts uniformly with the active substance on the first electrode foil 1 and the second electrode foil 2, thus optimizing the performance of the battery cell 100.

[0107] In some embodiments, such as in the Fig. 6, Fig. 8 and Fig. As shown in Figure 10, the electrode arrangement 10 also comprises a separator 3, wherein the separator 3 serves to separate the first electrode foil 1 from the second electrode foil 2, the separator 3, the main body 11 of the first electrode foil 1 and the main body of the second electrode foil 2 are entangled together and thus form the winding body S; wherein, in the extension direction of the winding axis K, the part of at least one side of the separator 3 located in the fluid-conducting area 111 projects beyond the side of the main body 11 of the first electrode foil 1 and the side of the main body 11 of the second electrode foil 2.

[0108] Separator 3 can be a long strip structure when unfolded; Separator 3 can be made of PP (polypropylene) or PE (polyethylene); inside there are micropores in the micrometer or nanometer range that allow the passage of metal ions during the charging and discharging process of the battery.

[0109] Optionally, the part of one side of the separator 3 located in the fluid-conducting area 111 projects beyond the side of the main body 11 of the first electrode foil 1 and the side of the main body 11 of the second electrode foil 2 in the direction of extension of the winding axis K; alternatively, as shown in Fig. Figure 13A shows the parts of both sides of the separator 3 located in the fluid-conducting area 111 extending beyond the sides of the main body 11 of the first electrode foil 1 and the main body 11 of the second electrode foil 2.

[0110] In this embodiment of the present application, the separator 3 is designed in a stepped form, wherein the liquid-conducting area 111 is widened so that the sides of the separator 3 between the first electrode foil 1 and the second electrode foil 2 extend outwards in the liquid-conducting area 111 and can immerse themselves in the electrolyte solution. This allows the separator 3 to more easily absorb the electrolyte solution by capillary action, which improves the wetting properties of the electrode arrangement 10 and thus increases the performance of the battery cell 100. Alternatively, as in Fig. As shown in Figure 12A, the separator 3 can also be designed as a long strip structure of the same width.

[0111] In some embodiments, such as in Fig. As shown in Figure 13A, the electrode arrangement 10 also includes a separator 3, the separator 3 serving to insulate the first electrode foil 1 from the second electrode foil 2. The main body 11, comprising at least one of the first electrode foil 1 and the second electrode foil 2, includes an active substance region A and a flow-guiding region B, arranged side by side along the extension direction of the winding axis K. The flow-guiding region B is located outside the active substance region A and serves to direct the electrolyte solution into the interior of the winding body S; as shown in Fig. 17 and Fig. As shown in Figure 18, the gap between the surface of the main body 11 in the flow guidance region B and the separator 3 is larger than the gap between the surface of the main body 11 in the active substance region A and the separator 3.

[0112] For example, the first electrode foil 1 is a cathode foil, and the active substance area A is coated with an active cathode substance, such as a ternary material, lithium manganese oxide or lithium iron phosphate; the second electrode foil 2 consists of the active anode substance, which may be graphite or silicon.

[0113] In this embodiment of the present application, the gap between the surface of the main body 11 in the flow guidance region B and the separator 3 is larger than the gap between the surface of the main body 11 in the active substance region A and the separator 3, thus creating a larger capillary gap between the flow guidance region B and the separator 3. After the electrolyte solution is drawn into the end of the separator 3, it allows the rapid entry of the electrolyte solution into the end of the winding body S and from there into the active substance region A to react with the active substance. This design results in a gradual decrease in the gap between the main body 11 and the separator 3 from the outside to the inside, which facilitates the rapid entry of the electrolyte solution.

[0114] In some embodiments, such as in Fig. As shown in Figure 12A, the flow guidance area B of at least one of the first electrodes 1 and the second electrode foil 2 comprises a wetting area B1 adjacent to the active substance area A, and the gap between the surface of the main body 11 in the wetting area B1 and the separator 3 gradually increases from the inside out along the extension direction of the winding axis K.

[0115] The wetting area B1 can be a long, strip-shaped structure extending along the entire winding direction of the main body 11 and serving to introduce the electrolyte solution. The width of the wetting area B1 in the direction of the winding axis K is smaller than the width of the active substance area A. As shown in Fig. 17 and Fig. As shown in Figure 18, the surface of the wetting area B1 along the extension direction of the winding axis K can be an inclined surface or be designed as an arc, step or the like; any gap between the surface of the wetting area B1 and the separator 3, which gradually increases from the inside out, falls within the scope of protection of the present application.

[0116] This embodiment of the present application makes it possible to draw the electrolyte solution into the end of the separator 3 and then introduce it through the wetting area B1 into the active substance area A, thereby facilitating the rapid penetration of the electrolyte solution into the interior of the winding body S for reaction.

[0117] In some embodiments, such as in the Fig. 17 and Fig. As shown in Figure 18, the flow guidance region B comprises at least one of the first electrode foil 1 and the second electrode foil 2 a wetting region B1, which adjoins the active substance region A, wherein the main body 11 comprises at least one of the first electrode foil 1 and the second electrode foil 2 a current collector 114, an active substance layer 112 and a wetting layer 113, the active substance layer 112 is arranged on the surface of the current collector 114 and is located in the active substance region A, the wetting layer 113 is arranged on the surface of the current collector 114 and is located in the wetting region B1, the liquid absorption capacity of the wetting layer 113 is higher than that of the active substance layer 112.

[0118] The term "liquid absorption capacity" refers to the ability of a coating layer to absorb electrolyte solution per unit area per unit time. For example, the first electrode foil 1 is a cathode foil, and aluminum foil can be used as the current collector 114; the second electrode foil 2 is an anode foil, and copper foil can be used as the current collector 114. The wetting layer 113 comprises, for example, an inorganic ceramic coating, a polymer, and an adhesive. As in Fig. As shown in Figure 17, the side of the wetting layer 113 is flush with the side of the current collector 114, and the side of the separator 3, which is adjacent to the first electrode foil 1, extends beyond the sides of the wetting layer 113 and the current collector 114.

[0119] In this embodiment of the present application, the wetting layer 113, which has a higher liquid absorption capacity than the active substance layer 112, is applied to an area of ​​the main body 11 facing the outside. The material properties of the wetting layer 113 improve the ability of the end of the winding body S to absorb the electrolyte solution, so that the electrolyte solution is quickly drawn into the interior of the winding body S.

[0120] Furthermore, the gap between the surface of the main body 11 in the wetting area B1 and the separator 3 gradually increases from the inside out; that is, the thickness of the wetting layer 113 is less than the thickness of the active substance layer 112. A gap forms between the wetting layer 113 and the separator 3, which gradually expands from the inside out and facilitates the absorption of the electrolyte solution. By improving both the structural design and the material properties, the wetting properties of the electrode arrangement 10 can be further enhanced.

[0121] In some embodiments, such as in Fig. 13A, Fig. 14A, Fig. 14B and Fig. As shown in Figure 18, the flow guidance area B comprises at least one of the first electrode foil 1 and the second electrode foil 2, and furthermore a guidance area B2, wherein the area in which the current collector 114 extends beyond the wetting layer 113 in the direction of the winding axis K forms a guidance area B2.

[0122] Guide area B2 is the area in which the current collector 114 extends beyond the wetting layer 113 in the direction of the winding axis K. No coating layer is present in this area, and the entire portion of the current collector 114 located in guide area B2 is connected to the tab 12. The side of the separator 3 adjacent to the first electrode foil 1 projects beyond the side of the current collector 114, so that the electrolyte solution is first drawn through the separator 3 and then successively passes through guide area B2 and wetting area B1 into the active substance area A.

[0123] In this embodiment of the present application, no coating layer is provided in the guide area B2, whereby the gap between the current collector 114 in the guide area B2 and the separator 3 is larger than the gap between the surface of the wetting layer 113 and the separator 3. This allows the formation of multi-stage channels for the absorption of the electrolyte solution at the end of the winding body S, which is located in the liquid-conducting area 111. The distance between the first electrode foil 1 or the second electrode foil 2 and the separator 3 gradually decreases from the guide area B2 and the wetting area B1 to the active substance area A, which can significantly improve the liquid absorption efficiency and increase the wetting properties of the electrode arrangement 10, thus improving the performance of the battery cell 100.

[0124] In some embodiments, such as in Fig. As shown in Figure 13A, the first electrode foil 1 is a cathode foil and is successively provided from the inside out along the direction of extension of the winding axis K with an active substance area A, a wetting area B1 and a guide area B2; as shown in Fig. As shown in Figure 13B, the second electrode foil 2 is an anode foil and is successively provided along the winding axis K from the inside out with an active substance area A and a guide area B2.

[0125] This embodiment of the present application takes into account that the cathode foil has a relatively high density and the electrolyte solution penetrates the cathode foil relatively slowly. By adding the wetting area B1 on the cathode foil, the rate at which the electrolyte solution penetrates the active cathode material can be accelerated; the electrolyte solution then enters the anode foil more quickly than the cathode foil, and guiding the electrolyte solution exclusively through the guiding area B2 simplifies the manufacturing process of the anode foil. This embodiment allows the rate at which the electrolyte solution enters the cathode foil and the anode foil to be made approximately equal, thus reducing the production difficulty of the electrode assembly 10.Alternatively, the first electrode foil 1 and the second electrode foil 2 can also be configured with the same structure, e.g. both are provided with a wetting area B1, or neither is provided with a wetting area B1.

[0126] In some embodiments, the side of the separator 3 that is located in the fluid-conducting area 111 of at least one of the first electrode foil 1 and the second electrode foil 2 is located between the outside of the flow guidance area B and the outside of the tab 12.

[0127] In this embodiment of the present application, the side of the separator 3 projects beyond the outside of the flow guidance region B, so that the projecting part of the separator 3 can immerse itself in the electrolyte solution to draw in the electrolyte solution by capillary action; furthermore, the side of the separator 3 does not project beyond the outside of the tab 12, thus preventing the separator 3 from extending too far into the electrically conductive region 121, which would impair the flattening of the tab 12 and ensure the electrical conductivity of the tab 12.

[0128] In some embodiments, such as in the Fig. As shown in Figures 12A to 16, the extension length of the flow guidance area B in the circumferential direction around the winding body S corresponds to that of the active substance area A.

[0129] This embodiment of the present application can reduce the manufacturing difficulties of the electrode foil with the flow guidance area B, and the extension length of the flow guidance area corresponds to the extension length of the active substance area A, whereby the electrolyte solution can be effectively guided to the active substance area A along the entire coating length of the active substance area A, thereby ensuring that the electrolyte solution is distributed uniformly over the entire winding length of the electrode foil, thus improving the performance of the battery cell 100.

[0130] Some of the above embodiments use the first electrode foil 1 as an example to illustrate the specific structure of the electrode foil; the second electrode foil 2 may also use the same or a similar structure.

[0131] The construction of the electrode arrangement 10 is described below using some specific examples.

[0132] In the first embodiment, as in the Fig. 6 and Fig. 7 shown, shows Fig. Figure 6 shows only the structure of one end of the battery cell 100, while the structure of the other end can be symmetrical to the end shown in the figure. The housing 101 is provided with an electrode assembly 10, the end of the housing 101 has an opening 1011 and is closed by an end cap component 102, the end cap component 102 comprises an end cap body 1021, a terminal 1022, an insulating element 1024 and an adapter 1025. The insulating element 1024 is arranged on one side of the end cap body 1021 facing the electrode assembly 10, and the adapter 1025 is arranged on one side of the insulating element 1024 facing the electrode assembly 10.

[0133] The electrode arrangement 10 comprises a first electrode foil 1, a second electrode foil 2, and a separator 3. The first electrode foil 1 and the second electrode foil 2 are stacked on top of each other, and the separator 3 serves to separate the first electrode foil 1 from the second electrode foil 2. The first electrode foil 1, the second electrode foil 2, and the separator 3 are intertwined such that the respective main body 11 of the first electrode foil 1 and the second electrode foil 2 each form a winding body S. The end of the winding body S is provided with an electrically conductive region 121 and two liquid-conducting regions 111, which are arranged concentrically, with the electrically conductive region 121 located between the two liquid-conducting regions 111. The tab 12 extends from the electrically conductive region 121 and is wrapped multiple times, for example, six times.After flattening, the tab 12 forms a bent section and is electrically connected to the terminal 1022 at the same end via the adapter 1025. The tab 12 can be bent radially inwards to prevent the bent section from contacting the inner wall of the housing 101 and to reduce the radial dimension of the adapter 1025.

[0134] In the electrically conductive region 121, the first electrode foil 1 has the greatest extension length, followed by the separator 3, and the second electrode foil 2 extends to the horizontal dashed line; in the liquid-conducting region 111, the separator 3 has the greatest extension length, and the first electrode foil 1 and the second electrode foil 2 extend to the horizontal dashed line, with the first electrode foil 1 and the second electrode foil 2 being arranged alternately.

[0135] As in Fig. As shown in Figure 6, the outer ring of the insulating element 1024 is provided with a projecting section 1024' which serves to separate the tab 12 from the housing 101 in order to improve the insulating performance. For example, the adapter 1025 can comprise a first connector 1025A and a second connector 1025B, which are connected to each other, the first connector 1025A being welded to the tab 12, and the second connector 1025B being connected to the terminal 1022.

[0136] In the second embodiment, as in the Fig. 8 and Fig. As shown in Figure 9, the difference from the first embodiment is that at the end of the winding body S, two electrically conductive areas 121 and one liquid-conducting area 111 are arranged concentrically, with the liquid-conducting area 111 being located between the two electrically conductive areas 121. The tab 12 of each electrically conductive area 121 is wrapped multiple times without interruption, for example, 5 times.

[0137] In the third embodiment, as in the Fig. 10 and Fig. As shown in Figure 11, the difference from the first embodiment is that an electrically conductive region 121 and a fluid-conducting region 111 are arranged concentrically at the end of the winding body S, with the fluid-conducting region 111 being located radially outside the electrically conductive region 121. For example, the radial width of the electrically conductive region 121 is larger than the radial width of the fluid-conducting region 111.

[0138] The following are specific examples of implementation to illustrate the construction of the first electrode foil 1, the second electrode foil 2 and the separator 3 after unfolding.

[0139] In the first embodiment, as in Fig. As shown in Figure 12A, the first electrode foil 1 is the cathode foil, the main body 11 of the first electrode foil 1 comprises an active substance region A and a wetting region B1, which are arranged side by side along the extension direction of the winding axis K, with the wetting region B1 being located outside the active substance region A. As shown in Fig. As shown in Figure 17, the current collector 114 can be coated with an active substance layer 112 in the active substance area A, a wetting layer 113 can be applied in the wetting area B1, the liquid absorption capacity of the wetting layer 113 can be higher than that of the active substance layer 112, and the gap between the surface of the wetting layer 113 and the separator 3 gradually decreases from the outside to the inside and is larger than the gap between the active substance layer 112 and the separator 3. The side of the separator 3 can project beyond the side of the first electrode foil 1 by a width of W9.

[0140] The tab 12 projects laterally from the main body 11 along the direction of extension of the winding axis K. The tab 12 may be located near one end of the main body 11 along the winding length. After winding, the electrically conductive area 121 may be located in the inner or outer ring. The wetting layer 113 extends over the entire winding length of the first electrode foil 1, and a small portion of the width of the wetting layer 113, located on the outside of the electrically conductive area 121, may be provided on the tab 12. To reduce the stress on the root area when the tab 12 is flexed and to prevent breakage or stretching of the tab 12, a transition section 122, such as a rounded edge or a chamfer, may be provided at the root point where the tab 12 connects to the main body 11.Optionally, a transition section 122 can also be provided at the corner of the outer side of the tab 12. For example, the radius of the corner of the outer side of the tab 12 is in the range of R3 to R12 and is preferably R8; the radius at the connection with the main body 11 is in a range of values ​​between R1 and R8, preferably R5.

[0141] As in Fig. As shown in 12B, the second electrode foil 2 is the anode foil, the main body 11 of the second electrode foil 2 comprises only the active substance area A, and the tab 12 can be provided at a position of the main body 11 that approaches an end along the winding length.

[0142] As in Fig. As shown in Figure 12C, separator 3 is a rectangular strip-shaped form with a uniform width.

[0143] During winding, the respective tabs 12 of the first electrode foil 1 and the second electrode foil 2 are located on opposite sides in the direction of extension of the winding axis K.

[0144] In the second embodiment, as in Fig. As shown in Figure 13A, the first electrode foil 1 is the cathode foil. The main body 11 of the first electrode foil 1 comprises an active substance region A, a wetting region B1, and a guide region B2, which are arranged side by side along the direction of the winding axis K, with the wetting region B1 being located between the active substance region A and the guide region B2. The wetting region B1 and the guide region B2 extend over the entire winding length of the first electrode foil 1.

[0145] As in Fig. As shown in Figure 18, the current collector 114 can be coated with an active substance layer 112 in the active substance area A, a wetting layer 113 can be applied in the wetting area B1, the liquid absorption capacity of the wetting layer 113 can be higher than that of the active substance layer 112, and the gap between the surface of the wetting layer 113 and the separator 3 gradually decreases from the outside to the inside and is larger than the gap between the active substance layer 112 and the separator 3. The side of the separator 3 can project beyond the side of the guide area B2 by a width of W9'.

[0146] The tab 12 projects from the side of the main body 11 along the direction of extension of the winding axis K; the tab 12 can be located at one end of the main body 11. After winding, the electrically conductive area 121 can be located in the inner ring or the outer ring.

[0147] As in Fig. As shown in Figure 13B, the second electrode foil 2 is the anode foil, the main body 11 of the second electrode foil 2 comprises the active substance region A and the guide region B2, and the tab 12 can be provided at a position of the main body 11 that approaches one end along the winding length. The current collector 114 can be coated with an active substance layer 112 in the active substance region A, and the part of the current collector 114 that extends beyond the side of the active substance region A forms a guide region B2.

[0148] As in Fig. As shown in Figure 13C, the width of the separator 3 in the electrically conductive area 121 is W0, and both sides of the separator 3 in the liquid-conducting area 111 are widened by W1, so that the side of the separator 3 in the liquid-conducting area 111 extends beyond the side of the main body 11 to facilitate liquid absorption.

[0149] During winding, the respective tabs 12 of the first electrode foil 1 and the second electrode foil 2 are located on opposite sides in the direction of extension of the winding axis K.

[0150] In the third embodiment, as in Fig. As shown in Figure 14A, the first electrode foil 1 is the cathode foil and has the same structure as in Figure 14A. Fig. 13A. In the extension direction of the winding axis K, the width of the active substance area A W4, the width of the wetting area B1 W3, the width of the guide area B2 W2 and the width of the tab 12 W5.

[0151] As in Fig. As shown in Figure 14B, the second electrode foil 2 is the anode foil, and its structure is the same as that of Figure 14B. Fig. 14A. In the extension direction of the winding axis K, the width of the active substance area A W8, the width of the wetting area B1 W7, the width of the guide area B2 W6 and the width of the tab 12 W9.

[0152] As in Fig. As shown in Figure 14C, the width of the separator 3 in the electrically conductive area 121 is W0, and both sides of the separator 3 in the liquid-conducting area 111 are widened by W1, so that the side of the separator 3 in the liquid-conducting area 111 extends beyond the side of the main body 11 to facilitate liquid absorption. Alternatively, the separator 3 can also be the one shown in Figure 14C. Fig. exhibit the structure shown in 12C of the same width.

[0153] In further embodiments, as in Fig. As shown in Figure 15, the first electrode foil 1 can be either a cathode foil or an anode foil. The main body 11 of the first electrode foil 1 comprises an active substance region A and a wetting region B1, arranged side by side along the direction of the winding axis K, with the wetting region B1 located outside the active substance region A. The tab 12 can be located in the central region of the main body 11 along the winding length. After winding, the electrically conductive region 121 is located in the central region of the winding body S in the radial direction.

[0154] In further embodiments, as in Fig. As shown in Figure 16, it is provided that the first electrode foil 1 can be a cathode foil or an anode foil, in contrast to Fig. 15 Two tabs 12 are attached to the side of the main body 11 along the extension direction of the winding axis K. These two tabs 12 are spaced apart from each other and are located at the two ends of the main body 11 facing the winding length. After winding, the end of the winding body S is provided with two electrically conductive areas 121 and one liquid-conducting area 111, the liquid-conducting area 111 being located between the two electrically conductive areas 121.

[0155] Fig. Figure 19 is a schematic structural representation of some embodiments in which the first electrode foil 1, the second electrode foil 2, and the separator 3 are stacked on top of each other before winding. For example, the first electrode foil 1 can be an anode foil, and correspondingly, the second electrode foil 2 can be a cathode foil, with the first electrode foil 1 being longer than the second electrode foil 2, and the separator 3 being longer than the first electrode foil 1. The tabs 12 of the first electrode foil 1 and the second electrode foil 2 extend outwards in opposite directions along the winding axis K and are each located at the position of the main body 11 facing the first end along the winding direction, the first end always being the left end, and the tab 12 extends continuously in the direction of the winding length of a portion of the main body 11.

[0156] The main body 11 of the first electrode foil 1 comprises only the active substance coating area A. The main body 11 of the second electrode foil 2 comprises an active substance area A and a wetting area B1, arranged side by side along the direction of the winding axis K, with the wetting area B1 located outside the active substance area A. Along the direction of the winding axis K, the width margins on both sides of the active substance coating area A of the first electrode foil 1 extend beyond the width margins of the corresponding side of the active substance coating area A of the second electrode foil 2. The separator 3 has a uniform width structure. Both sides of the separator 3 extend beyond the sides on the same side of the main body 11 of the first electrode foil 1 and the second electrode foil 2, and do not extend beyond the outer surface of the tab 12.

[0157] The above-mentioned specific embodiments are merely schematic representations of the structural forms and combinations of the first electrode foil 1, the second electrode foil 2 and the separator 3; in actual installation, different combinations of the first electrode foil 1, the second electrode foil 2 and the separator 3 can be used as required.

[0158] Secondly, a method for manufacturing an electrode arrangement 10 is provided, as shown in Fig. 20, in some embodiments the manufacturing process comprises the following: S110. Providing a first electrode foil 1 and a second electrode foil 2 having opposite polarities, wherein the first electrode foil 1 and the second electrode foil 2 each comprise a main body 11 and a tab 12 extending from the main body 11; S120. The first electrode foil 1 and the second electrode foil 2 are wound around a winding axis K such that their respective main bodies 11 form a winding body S, wherein the end of the winding body S comprises at least one electrically conductive region 121 and at least one fluid-conducting region 111;

[0159] The tab 12 is brought out of the electrically conductive area 121 and wrapped at least once and serves for electrical connection with the terminal 1022 of the battery cell 100, the liquid-conducting area 111 and the electrically conductive area 121 are arranged next to each other along the radial direction of the winding body S and serve to guide the electrolyte solution into the interior of the winding body S.

[0160] After winding by S120, the tab 12 at the end of the winding body S is flattened so that the tab 12 forms the bending section which facilitates the electrical connection with the terminal 1022.

[0161] This embodiment of the present application has both an electrically conductive area 121 and a liquid-conducting area 111 at the end of the winding body S. Since no tab 12 is provided in the liquid-conducting area 111, the electrolyte solution in the battery cell 100 can easily flow into the interior of the winding body S through the gap between the first electrode foil 1 and the second electrode foil 2 in the liquid-conducting area 111 after the tab 12 in the electrically conductive area 121 has been flattened. This ensures the wetting properties of the electrode arrangement 10, so that during the charging and discharging process of the battery the electrolyte solution reacts completely with the active substance on the first electrode foil 1 and the second electrode foil 2, thus optimizing the performance of the battery cell 100.

[0162] Since the tab 12 extends continuously and is wrapped at least once around the electrically conductive area 121, it exhibits good circumferential bond strength with the main body 11. This provides good self-support to the base of the tab 12, prevents folding of the tab 12 when a circumferential force is applied, stabilizes the shape of the flattened area, optimizes the welding effect between the tab 12 and the terminal 1022, ensures reliable transmission of electrical energy to the outside through the electrode arrangement 10, and improves the current-carrying capacity. Furthermore, particles generated during the welding of the tab 12 are less likely to fall in the circumferential direction within the fluid-conducting area 111 between the first electrode foil 1 and the second electrode foil 2, which can improve the reliability of the electrode arrangement 10.

[0163] Finally, the present application provides a manufacturing device 400 for an electrode arrangement 10, as shown in Fig.Figure 21 shows the manufacturing device 400. In some embodiments, the manufacturing device 400 comprises an electrode foil supply device 410 and an electrode foil winding device 420. The electrode foil supply device 410 is configured to supply a first electrode foil 1 and a second electrode foil 2 of opposite polarity, wherein the first electrode foil 1 and the second electrode foil 2 each comprise a main body 11 and a tab 12 projecting from the main body 11; the electrode foil winding device 420 is configured such that the first electrode foil 1 and the second electrode foil 2 are wound around a winding axis K such that their respective main bodies 11 form a winding body S, wherein the end of the winding body S comprises at least one electrically conductive region 121 and at least one fluid-conducting region 111.The tab 12 is brought out of the electrically conductive area 121 and wrapped at least once and serves for electrical connection with the terminal 1022 of the battery cell 100, the liquid-conducting area 111 and the electrically conductive area 121 are arranged next to each other along the radial direction of the winding body S and serve to guide the electrolyte solution into the interior of the winding body S.

[0164] The manufacturing device 400 of this embodiment of the present application and the manufacturing process have the same technical effects.

[0165] Although the present application is described with reference to preferred embodiments, various modifications can be made and components replaced by equivalent ones without departing from the scope of the present application. In particular, the technical features mentioned in the individual embodiments can be combined arbitrarily, as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions that fall within the scope of the claims.

Claims

[1] Electrode arrangement (10) for a battery cell (100), wherein the electrode arrangement (10) comprises a first electrode foil (1) and a second electrode foil (2) having opposite polarities, wherein the first electrode foil (1) and the second electrode foil (2) each comprise a main body (11) and a tab (12) extending from the main body (11), wherein the first electrode foil (1) and the second electrode foil (2) are wound around a winding axis (K) such that their respective main bodies (11) form a winding body (S);wherein the end of the winding body (S) comprises at least one electrically conductive area (121) and at least one liquid-conducting area (111), wherein the tab (12) extends out of the electrically conductive area (121) and is wrapped at least once and is used for electrical connection with a terminal (1022) of the battery cell (100), wherein the liquid-conducting area (111) and the electrically conductive area (121) are arranged next to each other in the radial direction of the winding body (S) and are used to guide the electrolyte solution into the interior of the winding body (S). [2] Electrode arrangement (10) according to claim 1, wherein the tab (12) is wrapped multiple times in the electrically conductive area (121). [3] Electrode arrangement (10) according to claim 1 or 2, wherein the sum of the number of electrically conductive areas (121) and liquid-conducting areas (111) is greater than or equal to three, and wherein the electrically conductive areas and the liquid-conducting areas are arranged alternately along the radial direction of the winding body (S). [4] Electrode arrangement (10) according to claim 3, wherein the electrically conductive area (121) is located in the radial central region at the end of the winding body (S), wherein the electrically conductive area (121) is provided on both sides of the radial direction with a fluid-conducting area (111). [5] Electrode arrangement (10) according to one of claims 1 to 3, wherein at least one of the first electrode foil (1) and the second electrode foil (2) is provided with several tabs (12) spaced apart in the winding direction to form several electrically conductive areas (121) spaced apart in the radial direction at the end of the winding body (S). [6] Electrode arrangement (10) according to claim 5, wherein two electrically conductive areas (121) are provided, each located on the inside and outside of the ends of the winding body (S) in a radial direction, wherein the fluid-conducting area (111) is located between the two electrically conductive areas (121). [7] Electrode arrangement (10) according to claim 1 or 2, wherein an electrically conductive area (121) and a liquid-conducting area (111) are provided, and wherein the electrically conductive area (121) is located on the radial inside of the liquid-conducting area (111). [8] Electrode arrangement (10) according to any one of claims 1 to 7, wherein the fluid-conducting areas (111) at both ends of the winding body (S) have the same radial dimension, and wherein the electrically conductive areas (121) at both ends of the winding body (S) have the same radial dimension; or wherein the fluid-conducting area (111) at one end of the winding body (S) and the electrically conductive area (121) at the other end have the same radial dimension. [9] Electrode arrangement (10) according to any one of claims 1 to 8, further comprising a separator (3), wherein the separator (3) is used to separate the first electrode foil (1) from the second electrode foil (2), wherein the separator (3), the main body (11) of the first electrode foil (1) and the main body of the second electrode foil (2) are entangled together and form the winding body (S); wherein, in the extension direction of the winding axis (K), the part of the separator (3) located in the fluid-conducting area (111) projects beyond the side of the main body (11) of the first electrode foil (1) and the side of the main body (11) of the second electrode foil (2). [10] Electrode arrangement (10) according to one of claims 1 to 9, further comprising a separator (3), wherein the separator (3) is used to separate the first electrode foil (1) from the second electrode foil (2), wherein the main body (11) comprises at least one of the first electrode foil (1) and the second electrode foil (2) an active substance region (A) and a flow guidance region (B) arranged side by side along the extension direction of the winding axis (K), wherein the flow guidance region (B) is located outside the active substance region (A), wherein the gap between the surface of the main body (11) in the flow guidance region (B) and the separator (3) is larger than the gap between the surface of the main body (11) in the active substance region (A) and the separator (3). [11] Electrode arrangement (10) according to claim 10, wherein the flow guidance area (B) comprises at least one of the first electrode foil (1) and the second electrode foil (2) a wetting area (B1) adjacent to the active substance area (A), wherein the gap between the surface of the main body (11) in the wetting area (B1) and the separator (3) gradually increases from the inside out along the extension direction of the winding axis (K). [12] Electrode arrangement (10) according to claim 10 or 11, wherein the flow guidance area (B) comprises at least one of the first electrode foil (1) and the second electrode foil (2) a wetting area (B1) adjacent to the active substance area (A), wherein the main body (11) comprises at least one of the first electrode foil (1) and the second electrode foil (2) a current collector (114), an active substance layer (112) and a wetting layer (113), wherein the active substance layer (112) is arranged on the surface of the current collector (114) and is located in the active substance area (A), wherein the wetting layer (113) is arranged on the surface of the current collector (114) and is located in the wetting area (B1), wherein the liquid absorption capacity of the wetting layer (113) is higher than that of the active substance layer (112). [13] Electrode arrangement (10) according to claim 12, wherein the wetting layer (113) comprises an inorganic ceramic coating, a polymer and an adhesive. [14] Electrode arrangement (10) according to claim 12 or 13, wherein the flow guidance area (B) of at least one of the first electrode foil (1) and the second electrode foil (2) also includes a guidance area (B2), wherein the area in which the current collector (114) extends beyond the wetting layer (113) in the direction of the winding axis (K) forms a guidance area (B2). [15] Electrode arrangement (10) according to claim 14, wherein the first electrode foil (1) is a cathode foil and is successively provided from the inside out along the extension direction of the winding axis (K) with an active substance area (A), a wetting area (B1) and a guide area (B2), wherein the second electrode foil (2) is an anode foil and is successively provided along the winding axis (K) from the inside out with an active substance area (A) and a guide area (B2). [16] Electrode arrangement (10) according to one of claims 10 to 15, wherein the side of the separator (3) which is located in the fluid-conducting region (111) of at least one of the first electrode foil (1) and the second electrode foil (2) is located between the outside of the flow guidance region (B) and the outside of the tab (12). [17] Electrode arrangement (10) according to one of claims 10 to 16, wherein the extent length of the flow guidance area (B) in the circumferential direction around the winding body (S) corresponds to that of the active substance area (A). [18] Battery cell (100), comprising: a housing (101) with an opening (1011); an end cap component (102) for closing the opening (1011), wherein the end cap component (102) comprises an end cap body (1021) and a connection (1022) arranged on the end cap body (1021); and an electrode arrangement (10) according to one of claims 1 to 17, which is arranged inside the housing (101), wherein the tab (12) of the first electrode foil (1) or the tab (12) of the second electrode foil (2) is electrically connected to the terminal (1022). [19] Battery (200), comprising: a battery cell (100) according to claim 18; and a box (201) which serves to hold the battery cell (100). [20] Power-consuming device comprising a battery according to claim 19, wherein the battery is used to supply the power-consuming device with electrical energy. [21] Device (400) for manufacturing an electrode arrangement (10), comprising: an electrode foil delivery device (410) configured to provide a first electrode foil (1) and a second electrode foil (2) of opposite polarity, wherein the first electrode foil (1) and the second electrode foil (2) each comprise a main body (11) and a tab (12) projecting from the main body (11); and an electrode foil winding device (420) configured to wind the first electrode foil (1) and the second electrode foil (2) around the winding axis (K) such that their respective main bodies (11) form a winding body (S), wherein the end of the winding body (S) comprises at least one electrically conductive area (121) and at least one fluid-conducting area (111); wherein the tab (12) is brought out of the electrically conductive area (121) and is wrapped at least once and is used for electrical connection with a terminal (1022) of the battery cell (100), wherein the liquid-conducting area (111) and the electrically conductive area (121) are arranged next to each other in the radial direction of the winding body (S) and are used to guide the electrolyte solution into the interior of the winding body (S).

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