Pole piece, multi-pole ear electric core and battery

Abstract

This utility model discloses an electrode sheet, a multi-tab battery cell, and a battery. The electrode sheet includes a current collector, an active material layer, and a tab region permeation structure. The current collector has a coated area and an uncoated area, with the uncoated area located on one side of the coated area. The active material layer is coated on the coated area. The tab region permeation structure is formed on the uncoated area. After the electrode sheet is wound into a battery cell, the tab region permeation structure is arranged around the periphery of the battery cell core. The tab region permeation structure is used to form a radial permeation channel for electrolyte in the battery cell tabs. In this way, the tab region permeation structure can break through the limitation of the dense metal layer formed by the tabs in traditional multi-tab batteries, providing a radial permeation path for the electrolyte, improving the electrolyte permeation and wetting speed and uniformity, effectively reducing electrolyte residue at the bottom of the battery, and avoiding problems such as decreased utilization of active materials caused by insufficient local wetting or uneven electrolyte distribution on the battery electrode sheet.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to an electrode sheet, a multi-tab battery cell, and a battery. Background Technology

[0002] The electrolyte, often referred to as the "blood" of a battery, is one of the four core materials in battery technology. It is primarily absorbed by the positive and negative electrodes and the porous separator within the battery cell. During the manufacturing process of cylindrical batteries, the electrolyte wettability and absorption efficiency of the electrodes directly affect the battery's cycle life, energy density, and safety performance. In the winding process of traditional cylindrical batteries, a longitudinal cavity structure is typically formed at the center of the cell, with a diameter of 2-6 mm, and is circular or hexagonal. During the electrolyte injection process, this longitudinal central cavity is often used directly as the injection channel. However, this method easily leads to the electrolyte flowing rapidly along the cavity to the bottom of the battery, causing it to stagnate at the bottom and fail to be fully wetted and absorbed by the cell materials. Furthermore, the compact structure and long radial distance of the cell make it difficult for capillary forces to effectively overcome the gravity of the electrolyte, making it difficult to evenly and fully draw the electrolyte upwards and radially into the porous structure of the entire cell. Uneven electrolyte distribution and insufficient absorption are among the key bottlenecks leading to shortened battery cycle life, limited energy density, and significantly increased safety risks.

[0003] Furthermore, uneven absorption of electrolyte by the positive and negative electrodes of the battery cell can easily affect the electrochemical performance of the battery's active materials, and even reduce the battery's energy density and power density. If the battery electrodes do not absorb electrolyte, those active materials cannot perform, leading to a decrease in battery energy density and power density. Excess electrolyte residue on the electrode surface can also exacerbate side reactions and induce dendrite growth, resulting in a decline in battery cycle performance and safety.

[0004] Especially for cylindrical batteries with multiple or all tabs, the positive tabs form a dense metal plane during the flattening process. While this structure improves the reliability of conductive sheet welding, it also severely hinders the radial penetration of electrolyte between the electrodes, forcing the electrolyte to diffuse in only one direction through the central cavity. This significantly reduces the wetting efficiency of the electrolyte in a uniform distribution within the cell. Taking alkaline nickel-zinc batteries as an example, uneven electrolyte distribution inside the battery not only results in low utilization rates of the positive electrode active material Ni(OH)2 and the negative electrode active material ZnO, but also exacerbates interfacial side reactions. Specifically, excessive wetting of the bottom of the cell by alkaline electrolyte accelerates the local reaction rate, potentially leading to excessive consumption of active materials; while insufficient electrolyte in the middle and upper regions prevents some active materials from participating in electrochemical reactions, resulting in accelerated overall battery capacity decay. Furthermore, excess electrolyte remaining at the bottom of the battery casing for extended periods can lead to slow chemical reactions between alkaline substances in the electrolyte (such as sodium hydroxide, potassium hydroxide, and lithium hydroxide) and the metal current collector or tabs, resulting in corrosion products. Simultaneously, water molecules in the residual electrolyte are prone to electrochemical gas evolution side reactions at the bottom of the battery, causing the nickel-zinc battery casing to bulge or even fail to seal. In existing technologies, uneven electrolyte distribution can cause localized differences in electrochemical reactions, leading to battery capacity decay and exacerbated interfacial side reactions. Therefore, the quality of electrolyte filling in the battery cell directly affects the overall performance of the battery. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electrode, multi-tab cell and battery that can improve the electrolyte penetration and wetting speed and wetting uniformity.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An electrode sheet includes: a current collector, an active material layer, and a tab region permeation structure. The current collector has a coated area and an uncoated area, with the uncoated area located on one side of the coated area. The active material layer is coated on the coated area. The tab region permeation structure is formed on the uncoated area. After the electrode sheet is wound into a battery cell, the tab region permeation structure is arranged around the periphery of the central cavity of the battery cell. The tab region permeation structure is used to form a radial permeation channel for electrolyte in the battery cell tab.

[0008] In one embodiment, the electrode area permeation structure includes multiple through slots, each slot being spaced apart and penetrating the current collector. After the electrode is wound into a battery cell, each slot is connected to form a radial permeation channel for the electrolyte.

[0009] In one embodiment, the depth of the through groove is less than or equal to the width of the uncoated area.

[0010] In one embodiment, the through-slot is rectangular or / and trapezoidal in shape.

[0011] In one embodiment, the electrode area permeation structure includes multiple through holes, each of which penetrates the current collector. After the electrode is wound into a battery cell, each of the through holes is connected to form a radial permeation channel for the electrolyte.

[0012] In one embodiment, the electrode has an electrode end, and the uncoated area at the electrode end is not provided with the tab region penetration structure to form a conductive reinforcement portion. After the electrode is wound into a battery cell, the conductive reinforcement portion is located on the outermost ring of the battery cell.

[0013] A multi-tab battery cell, comprising the aforementioned electrode sheet, wherein the electrode sheet is a positive electrode sheet, the multi-tab battery cell further comprising a negative electrode sheet, a separator sheet and a positive conductive sheet, wherein the positive electrode sheet, the separator sheet and the negative electrode sheet are stacked and wound sequentially to form a core, wherein the uncoated area of ​​the current collector is flattened to form a tab of the positive electrode sheet, and the positive conductive sheet is connected to the tab.

[0014] In one embodiment, the positive electrode conductive sheet has a connecting hole that is connected to the radial permeation channel of the electrolyte.

[0015] In one embodiment, the electrolyte radial permeation channels are provided in multiple ways.

[0016] A battery includes the aforementioned multi-tab battery cell and a battery housing having a receiving cavity in which the multi-tab battery cell is placed.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] 1. The electrode sheet and multi-tab battery cell of this utility model, by setting a tab region permeation structure on the uncoated area, allows the electrode sheet to form a radial permeation channel for electrolyte after being wound into a battery cell. In this way, the tab region permeation structure breaks through the limitation of the dense metal layer formed by the tabs in traditional all-tab or multi-tab batteries, facilitating the radial permeation path for the electrolyte, ensuring uniform electrolyte wetting, effectively reducing electrolyte residue at the bottom, and avoiding problems such as decreased utilization of active materials due to insufficient local wetting.

[0019] 2. The multi-tab battery cell of this utility model sets a tab area permeation structure on the current collector of the positive electrode plate. The tab area permeation structure forms multiple radial permeation channels for electrolyte, thereby constructing a three-dimensional permeation network that is axially and radially connected inside the battery cell. This allows the electrolyte to permeate and diffuse into the battery cell in multiple directions through the central cavity of the battery cell core and the radial permeation channels, thereby significantly improving the wetting speed and uniformity of the electrolyte.

[0020] 3. The multi-tab battery cell of this utility model not only improves the electrolyte penetration ability by setting a tab area penetration structure on the tab (the uncoated area of ​​the current collector) of the positive electrode, but also ensures the metal layer density in the area of ​​the multi-tab battery cell where the tab area penetration structure is not set, and ensures the integrity of the conductive sheet welding interface, which significantly improves the electron transfer efficiency during the battery charging and discharging process, thereby extending the battery's cycle life and rate performance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0022] Figure 1 This is a schematic diagram of the electrode sheet in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a multi-pole battery cell (with a positive conductive sheet) in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a multi-pole battery cell (without a positive conductive sheet) in one embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the positive electrode conductive sheet in one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the electrode structure in another embodiment of the present invention. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a multi-tab battery cell 10 includes electrode sheets 11. The electrode sheet 11 specifically includes a current collector 100, an active material layer 200, and a tab region permeation structure 300. The current collector 100 has a coated area and an uncoated area, with the uncoated area located on one side of the coated area. The active material layer 200 is coated on the coated area. The tab region permeation structure 300 is formed on the uncoated area. After the electrode sheet 11 is wound into a battery cell, the tab region permeation structure 300 is arranged around the periphery of the central cavity of the battery cell. The tab region permeation structure 300 is used to form a radial permeation channel 300a for electrolyte in the battery cell tabs. Thus, through the tab region permeation structure 300, the limitation of the dense metal layer formed by the tabs 110 of traditional all-tab or multi-tab batteries can be overcome, providing a radial permeation path for electrolyte injection, ensuring the uniformity of electrolyte wetting, effectively reducing electrolyte residue at the bottom of the battery, and avoiding problems such as decreased utilization of active materials due to insufficient local wetting.

[0029] The aforementioned electrode 11 can be either a positive electrode 11 or a negative electrode 11, depending on the actual electrolyte injection position. When the electrolyte injection position starts from the positive terminal, the electrode 11 in this invention is a positive electrode 11; when the electrolyte injection position starts from the negative terminal, the electrode 11 in this invention is a negative electrode 11. Preferably, the electrolyte injection position starts from the positive terminal. Therefore, the electrode 11 in this invention is used as the positive electrode 11. In addition, the multi-tab battery cell 10 also includes a negative electrode 11, a separator sheet, and a positive conductive sheet 12. The positive electrode 11, the separator sheet, and the negative electrode 11 are stacked and wound in sequence to form a core. The uncoated area of ​​the current collector 100 is flattened to form the tab 110 of the positive electrode 11. The positive conductive sheet 12 is connected to the tab 110.

[0030] Taking an alkaline nickel-zinc battery as an example, electrode 11 can be a positive electrode containing nickel hydroxide. Current collector 100 can have an areal density of 100-400 g / m³. 2The foamed nickel, with active material layer 200 mainly containing spherical nickel hydroxide active material, and small amounts of functional materials such as metallic nickel powder conductive agent, metal oxide additives, polytetrafluoroethylene (PTFE) binder, carboxymethyl cellulose (CMC) thickener, and styrene-butadiene rubber latex (SBR) binder. The tab region permeation structure 300 is formed on the uncoated area of ​​the foamed nickel. The negative electrode sheet contains active materials such as zinc oxide, metallic zinc powder, and bismuth oxide, as well as small amounts of functional materials such as carboxymethyl cellulose (CMC) thickener and styrene-butadiene rubber latex (SBR) binder. The separator is a composite separator composed of a non-woven fabric separator with macropores and a polymer microporous membrane. Specifically, the non-woven fabric separator is mainly responsible for electrolyte absorption, while the microporous membrane mainly prevents micro-short circuits or short circuits caused by zinc dendrites. Furthermore, the electrolyte injected into nickel-zinc batteries is an alkaline aqueous solution, including substances such as potassium hydroxide, sodium hydroxide, and lithium hydroxide, as well as small amounts of organic or inorganic additives. The concentration of hydroxide ions is between 6 M and 12 M. Electrolyte injection methods can include vacuum injection and centrifugal injection.

[0031] It should be noted that, please refer to... Figure 1 and Figure 3 As shown, the uncoated area of ​​the current collector 100 is flattened to form the tab 110 of the positive electrode 11. Figure 3 The tab 110 of the positive electrode sheet is only a simplified diagram after flattening. That is, the tab area permeation structure 300 is located on the tab 110 of the wound positive electrode sheet 11. By setting the tab area permeation structure 300, an electrolyte radial permeation channel 300a is formed on the tab 110 of the positive electrode sheet 11. This breaks the limitation that the dense metal layer formed at the tab end of the traditional multi-tab battery cannot inject electrolyte. Thus, a three-dimensional permeation network with axial and radial communication is constructed inside the cell. It also allows the electrolyte to permeate and diffuse into the cell through the central cavity of the cell core and the electrolyte radial permeation channel 300a in multiple directions, thereby greatly improving the wetting speed and uniformity of the electrolyte. Furthermore, the permeation structure 300 in the tab region not only enhances the permeation and diffusion capabilities of the electrolyte, but also ensures the density of the metal layer in the areas of the multi-tab cell 10 where the permeation structure 300 in the tab region is not provided. This ensures the integrity of the conductive sheet welding interface, does not damage the performance of the multi-tab cell 10, and ensures that the electron transport performance of the battery is not affected during the charging and discharging process. As a result, the battery has the dual advantages of improved electrolyte absorption efficiency and reduced cell interface impedance.

[0032] Taking alkaline nickel-zinc batteries as an example, the concentration of hydroxide ions in alkaline electrolytes is relatively high, typically between 6 M and 12 M. Due to the high viscosity of the electrolyte, it often cannot penetrate the dense metal layer formed at the tab ends of traditional multi-tab batteries, resulting in poor electrolyte wettability and absorption throughout the cell. By setting a permeation structure 300 in the tab region, the high-viscosity alkaline electrolyte can permeate and diffuse into the cell in multiple directions through the radial permeation channel 300a, thereby significantly improving the wetting speed and uniformity of the alkaline electrolyte.

[0033] Specifically, the tab area permeation structure 300 on the electrode 11 can be a through hole, a through groove, or a composite structure formed by through holes and through grooves, etc. Regardless of the structure, the purpose is to ensure that after the electrode 11 is wound, the tab area permeation structure 300 can form an electrolyte radial permeation channel 300a at the tab end of the electrode 11. Through the electrolyte radial permeation channel 300a, the electrolyte can be injected not only from the central cavity of the core, thereby reducing electrolyte residue at the bottom of the battery cell and improving the uniformity of electrolyte wetting. Two implementation methods of the tab area permeation structure 300 are provided below.

[0034] Please see Figure 1 and Figure 3 As shown, in one embodiment, the electrode area permeation structure 300 includes multiple through slots, each slot is spaced apart and passes through the current collector 100. After the electrode 11 is wound into a battery cell, each through slot is connected to form an electrolyte radial permeation channel 300a.

[0035] It should be noted that after the electrode 11 is wound into a battery cell, the continuous channel formed by the interconnected slots penetrates the flattened positive electrode tab 110. This continuous channel is the electrolyte radial penetration channel 300a. The electrolyte radial penetration channel 300a is arranged around the central cavity of the wound core. Through the electrolyte radial penetration channel 300a, the electrolyte can be injected from the position of the positive electrode tab 110 and penetrate into the interior of the battery cell, forming a three-dimensional penetration network that is connected axially and radially. It should also be noted that the multiple slots are unevenly distributed in the non-coated area.

[0036] Further, please refer to Figure 1 and Figure 5 As shown, the depth of the channel is less than or equal to the width of the uncoated area. The channel structure is an open-cut structure formed by opening from the side of the current collector 100 and extending towards the active material layer 200; wherein, as... Figure 1 As shown, the depth of the channel is equal to the width of the uncoated area. The greater the depth of the channel, the easier it is for the electrolyte to penetrate; for example... Figure 5As shown, the depth of the through groove is less than the width of the uncoated area, retaining more of the conductive area of ​​the current collector 100, thereby increasing the area of ​​the tab. This further increases the contact area between the positive electrode conductive sheet 12 and the positive tab, significantly reducing the interface contact resistance and local current density, improving the electron transport efficiency during battery charging and discharging, and thus extending the battery's cycle life and rate performance. For example, the depth of the through groove is 2 / 3 of the width of the uncoated area. This not only facilitates electrolyte penetration and ensures uniform electrolyte penetration, but also further improves electron transport efficiency.

[0037] Preferably, the through-slot has a rectangular or / and trapezoidal structure. That is, the through-slot can be a rectangular structure, a trapezoidal structure, or a composite structure of rectangular and trapezoidal structures. This structure facilitates cutting and processing. Cutting methods can include laser cutting, mechanical die cutting, plasma cutting, etc. Furthermore, the trapezoidal structure of the through-slot provides better stability, reducing the likelihood of electrode wrinkling or breakage during battery manufacturing, thus improving battery performance consistency. It should also be noted that the electrolyte radial penetration channel 300a formed by the through-slot structure has a larger cross-sectional area, which not only facilitates electrolyte injection and penetration into the cell but is also more suitable for cells with a higher number of electrode windings 11.

[0038] In another embodiment, the tab region permeation structure 300 includes multiple through holes, each penetrating the current collector 100. After the electrode 11 is wound into a battery cell, the through holes connect to form an electrolyte radial permeation channel 300a. After winding, the through hole structure on the uncoated area of ​​the electrode 11 forms an inter-hole communication path in the tab 110 of the positive electrode 11. This inter-hole communication path is the electrolyte radial permeation channel 300a, allowing the electrolyte to achieve radial permeation through the inter-hole through hole path. Furthermore, the through hole structure design requires cutting the uncoated area of ​​the current collector 100 to facilitate subsequent edge-setting and flattening operations of the tab 110.

[0039] Please see Figure 1 or Figure 5 As shown, the electrode 11 has an electrode end, and the non-coated area at the electrode end is not provided with a tab area penetration structure 300 to form a conductive reinforcement part 120. After the electrode 11 is wound into a battery cell, the conductive reinforcement part 120 is located at the outermost ring of the battery cell.

[0040] It should be noted that the electrode end refers to the outermost ring after the electrode is wound into a battery cell. The absence of a tab penetration structure 300 in the uncoated area of ​​this electrode end region means that no through holes or grooves are cut in this area, retaining the current collector body. Therefore, when the electrode is wound into a battery cell, this electrode end region becomes an uncut, complete tab, forming the conductive reinforcement portion 120. This increases the contact area between the positive electrode conductive sheet 12 and the uncoated area of ​​the current collector (corresponding to the positive tab), thereby increasing the electron transport path and enhancing the electron transport capability of the positive tab, improving conductivity, and helping to reduce the battery's internal resistance. In this embodiment, the length of the conductive reinforcement portion 120 is greater than or equal to 2πr, preferably 2πr, where r is the radius of the entire battery cell, and 2πr is the circumference of the battery cell. This does not affect electrolyte penetration and further enhances the conductivity of the positive tab. Please refer to [link to relevant documentation]. Figure 3 and Figure 4 As shown, in one embodiment, the positive electrode conductive sheet 12 of the multi-tab 110 battery cell 10 has a connecting hole 12a, which is connected to the electrolyte radial penetration channel 300a. The positive electrode conductive sheet 12 is connected to the tab 110 (the uncoated area of ​​the current collector 100) of the positive electrode 110 by welding. The welding method may include ultrasonic welding, resistance welding, laser welding, electromagnetic pulse welding, etc. By opening the connecting hole 12a on the positive electrode conductive sheet 12 and making the connecting hole 12a connected to the electrolyte radial penetration channel 300a, the electrolyte injection operation can be performed after the positive electrode conductive sheet 12 is welded, which can facilitate the rapid injection of electrolyte.

[0041] Please see Figure 4 As shown, the diameter of the positive electrode conductive sheet 12 is less than or equal to the diameter of the battery cell to facilitate the assembly of the positive electrode conductive sheet 12. Furthermore, in this embodiment, the positive electrode conductive sheet 12 has a battery cell connecting portion and a welding extension portion 12c. A through hole is formed on the battery cell connecting portion. One end of the welding extension portion 12c is connected to the edge of the battery cell connecting portion, and the other end of the welding extension portion 12c extends away from the battery cell connecting portion. An elongated through hole 12d is formed on the welding extension portion 12c. The battery cell connecting portion is welded to the positive electrode tab of the battery cell, and the welding extension portion 12c is bent and welded to the top of the battery casing. The elongated through hole 12d in the welding extension portion 12c mainly facilitates the bending of the welding extension portion 12c.

[0042] In addition, in the appendix Figure 4In this embodiment, the raised solder joints 12b on the positive electrode conductive sheet 12 are the solder joint locations. The number of solder joints can be selected according to the actual situation of the battery. Increasing the number of solder joints helps to improve the internal resistance of the battery by providing more current transmission paths and reducing contact internal resistance, thereby avoiding local overheating problems. In addition, increasing the number of solder joints helps to improve vibration resistance and improve the stability, reliability and cycle life of battery performance. However, too many solder joints require higher welding process requirements, and improper control can easily lead to problems such as poor soldering and short circuits. In this embodiment, there are 18 welding positions on the positive electrode conductive sheet 12, and the raised solder joints 12b can strengthen the electrical connection between the positive electrode of the cell and the top assembly.

[0043] In one embodiment, multiple radial permeation channels 300a are provided for the electrolyte. This increases the number of electrolyte injection points, thereby further improving the permeation rate and the uniformity of electrolyte wetting. For example, the radial permeation channels 300a can be distributed radially from the central cavity of the core, which can greatly improve the uniformity of electrolyte wetting and effectively avoid the problem of electrolyte residue at the bottom of the battery.

[0044] It should also be noted that, in one embodiment, the electrolyte injection point can utilize only the electrolyte radial penetration channel 300a, allowing the electrolyte to axially penetrate and wet each layer of the core winding, thereby constructing a three-dimensional penetration network that connects axially and radially within the core, ensuring uniform electrode liquid wetting. In another embodiment, the electrolyte injection point can utilize both the central cavity of the core winding and the electrolyte radial penetration channel 300a, enabling the electrolyte to diffuse and penetrate in multiple directions, significantly improving the wetting speed and uniformity of the electrolyte. Furthermore, since there are multiple electrolyte injection points instead of a single injection path through the central cavity, the amount of electrolyte injected into the central cavity is reduced, thereby greatly reducing the chance of electrolyte residue remaining at the bottom of the core.

[0045] A battery includes the aforementioned multi-tab battery cell 10, and a battery casing having a receiving cavity in which the multi-tab battery cell is placed. By incorporating the aforementioned multi-tab battery cell 10, the multi-tab battery can significantly improve the electrolyte wetting efficiency and uniformity, and also ensure the electron transport efficiency of the multi-tab battery cell 10 during charging and discharging, thereby extending the battery's cycle life and rate performance.

[0046] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode sheet, characterized in that, include: A current collector having a coated area and an uncoated area, the uncoated area being located on one side of the coated area; An active material layer is coated on the coating area; The electrode tab area permeation structure is formed on the uncoated area. After the electrode sheet is wound into a battery cell, the electrode tab area permeation structure is arranged around the periphery of the central cavity of the battery cell. The electrode tab area permeation structure is used to make the battery cell electrode tab form an electrolyte radial permeation channel.

2. The electrode sheet according to claim 1, characterized in that, The electrode area permeation structure includes multiple through slots, each slot being spaced apart and penetrating the current collector. After the electrode is wound into a battery cell, each slot is connected to form the electrolyte radial permeation channel.

3. The electrode sheet according to claim 2, characterized in that, The depth of the through groove is less than or equal to the width of the uncoated area.

4. The electrode sheet according to claim 3, characterized in that, The through slot has a rectangular structure and / or a trapezoidal structure.

5. The electrode sheet according to claim 1, characterized in that, The electrode area permeation structure includes multiple through holes, each of which penetrates the current collector. After the electrode is wound into a battery cell, each of the through holes is connected to form the electrolyte radial permeation channel.

6. The electrode sheet according to claim 1, characterized in that, The electrode has an electrode end, and the uncoated area at the electrode end does not have the tab region penetration structure to form a conductive reinforcement portion. After the electrode is wound into a battery cell, the conductive reinforcement portion is located on the outermost ring of the battery cell.

7. A multi-pole battery cell, characterized in that, The battery includes the electrode sheet according to any one of claims 1-6, wherein the electrode sheet is a positive electrode sheet, and the multi-tab battery cell further includes a negative electrode sheet, a separator sheet and a positive conductive sheet, wherein the positive electrode sheet, the separator sheet and the negative electrode sheet are stacked and wound in sequence to form a core, wherein the uncoated area of ​​the current collector is flattened to form the tab of the positive electrode sheet, and the positive conductive sheet is connected to the tab.

8. The multi-pole battery cell according to claim 7, characterized in that, The positive electrode conductive sheet has a connecting hole, which is connected to the radial permeation channel of the electrolyte.

9. The multi-pole battery cell according to claim 7, characterized in that, The electrolyte radial permeation channel is provided with multiple channels.

10. A battery, characterized in that, The battery includes the multi-tab battery cell according to any one of claims 7-9, and further includes a battery housing having a receiving cavity, in which the multi-tab battery cell is placed.

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