Pole piece and battery cell
By setting holes in the current collector and filling them with conductive components to form a continuous conductive network, the problem of small contact area between the active material and the current collector is solved, achieving efficient electron transport and high capacity and long lifespan of the active layer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HU ZHOU YAO NING GU TAI DIAN CHI YAN JIU YUAN YOU XIAN GONG SI
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-02
AI Technical Summary
In existing technologies, the contact area between the active material of the electrode and the current collector is small, resulting in a large interfacial resistance, obstructed electron transport path, and reduced transport efficiency.
Multiple first holes are provided on the current collector, and second conductive parts are filled in the holes to make them electrically connected to the first conductive parts. At the same time, a first conductive layer and an active layer, including a conductive polymer and an inorganic conductive layer, are provided between the current collector and the active body to form a continuous conductive network, increase the contact area and form a three-dimensional conductive network.
It effectively reduces interface resistance, improves electron transport path, increases electron transport efficiency, enhances charge and discharge performance, and extends the service life of the active layer.
Smart Images
Figure CN224318468U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to an electrode and a battery cell. Background Technology
[0002] Electrodes typically consist of a current collector and an active material, with the active material covering the sidewalls of the current collector. In related technologies, the contact area between the active material and the current collector is small, resulting in a high interfacial resistance, which in turn obstructs the electron transport path and reduces transport efficiency. Utility Model Content
[0003] To address the aforementioned technical problems, embodiments of this application provide an electrode and a battery cell that can reduce interface resistance, improve the problem of obstructed electron transport paths, and enhance electron transport efficiency.
[0004] Firstly, an electrode sheet is provided, comprising:
[0005] The current collector has multiple first holes;
[0006] The first conductive layer includes a first conductive portion and a second conductive portion. The first conductive portion is disposed on at least one side of the current collector, and the second conductive portion is filled into a plurality of the first holes. The second conductive portion is electrically connected to the first conductive portion.
[0007] An active material is disposed on the side of the first conductive portion away from the current collector.
[0008] According to a first aspect of this application, the first conductive portion and / or the second conductive portion comprises a conductive polymer.
[0009] According to a first aspect of this application, the active body comprises:
[0010] The second conductive layer is disposed on the side of the first conductive portion away from the current collector;
[0011] An active layer is disposed on the side of the second conductive layer opposite to the first conductive portion.
[0012] According to a first aspect of this application, the second conductive layer comprises an inorganic conductive layer.
[0013] According to a first aspect of this application, the active body further includes:
[0014] A protective layer is disposed on the side of the active layer opposite to the second conductive layer.
[0015] According to a first aspect of this application, the protective layer comprises a ceramic layer.
[0016] According to a first aspect of this application, the active layer is provided with a plurality of second holes, the second holes penetrating the active layer along the thickness direction of the active layer.
[0017] According to a first aspect of this application, the aperture of the second hole is A, wherein A satisfies: 0.1μm≤A≤1μm.
[0018] According to a first aspect of this application, the porosity of the current collector is B, wherein B satisfies: 50% ≤ B ≤ 80%; wherein the porosity characterizes the percentage between the volume of the plurality of first pores and the volume of the current collector.
[0019] Secondly, a battery cell is also provided, including:
[0020] The electrode sheet as described in the previous embodiment.
[0021] The electrode and battery cell provided in this application embodiment, by providing a first conductive portion between the current collector and the active body, and providing a plurality of first holes on the current collector, and filling the plurality of first holes with a second conductive portion, can achieve at least the following technical effects: First, the first and second conductive portions themselves have high conductivity, which can form a continuous conductive network between the current collector and the active body. This can effectively reduce the interface resistance, improve the problem of blocked electron transport paths, and improve electron transport efficiency. Second, the second conductive portion filling the first hole and being electrically connected to the first conductive portion can increase the contact area between the first conductive portion and the current collector. This can further reduce the interface resistance, improve the problem of blocked electron transport paths, and improve electron transport efficiency. Third, the second conductive portion filling the first hole and being electrically connected to the first conductive portion can form a three-dimensional conductive network in the thickness direction of the current collector. This can further reduce the interface resistance, improve the problem of blocked electron transport paths, and improve electron transport efficiency. Attached Figure Description
[0022] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.
[0023] Figure 1 A schematic diagram of the structure of an electrode provided in an exemplary embodiment of this application from a first-view perspective.
[0024] Figure 2A schematic diagram of the structure of an electrode provided in an exemplary embodiment of this application from a second perspective.
[0025] Figure 3 This is a schematic diagram of the structure of a current collector provided for an exemplary embodiment of this application.
[0026] Figure 4 This is a schematic diagram of the structure of the active layer provided in an exemplary embodiment of this application.
[0027] Reference numerals: 100-Electrode; 110-Current collector; 111-First hole; 120-First conductive part; 130-Active body; 131-Second conductive layer; 132-Active layer; 1321-Second hole; 133-Protective layer. Detailed Implementation
[0028] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.
[0029] Figure 1 A schematic diagram of the structure of an electrode provided in an exemplary embodiment of this application from a first-view perspective. Figure 2 This is a schematic diagram of the structure of an electrode provided in an exemplary embodiment of this application from a second viewpoint. Figure 1 and Figure 2 As shown, the electrode 100 provided in this application embodiment may include a current collector 110, which is generally made of metal and can be used to transfer electrons.
[0030] It should be noted that the electrode 100 provided in this application embodiment can be used as a positive electrode or a negative electrode.
[0031] It should be noted that the current collector 110 typically includes copper foil and aluminum foil. Specifically, copper foil has excellent conductivity and good performance stability in negative electrode potential environments; therefore, copper foil is often used as the current collector 110 in negative electrode sheets. Aluminum foil, on the other hand, has the advantages of being lightweight and low-cost, and its performance is stable in positive electrode potential environments; therefore, aluminum foil is often used as the current collector 110 in positive electrode sheets.
[0032] like Figure 2 As shown, the electrode 100 may further include a first conductive layer and an active body 130. The first conductive layer includes a first conductive portion 120, which is disposed on at least one side of the current collector 110. The active body 130 is disposed on the side of the first conductive portion 120 away from the current collector 110.
[0033] It should be noted that electrons can be transferred between the active body 130 and the current collector 110 through the first conductive part 120.
[0034] Furthermore, Figure 3 This is a schematic diagram of the current collector structure provided in an exemplary embodiment of this application. The first conductive layer may further include a second conductive portion (not shown in the figure). The current collector 110 is provided with a plurality of first holes 111, and the second conductive portion fills into the first holes 111, and the second conductive portion is electrically connected to the first conductive portion. In this way, firstly, the first conductive portion 120 and the second conductive portion themselves have high conductivity, which can form a continuous conductive network between the current collector 110 and the active body 130, reduce the interface resistance, improve the problem of blocked electron transport path, and improve the electron transport efficiency; secondly, the second conductive portion filling into the first holes can increase the contact area between the first conductive portion 120 and the current collector 110, reduce the interface resistance, improve the problem of blocked electron transport path, and improve the electron transport efficiency; thirdly, the first conductive portion 120 and the second conductive portion can form a three-dimensional conductive network in the thickness direction of the current collector 110, which can further reduce the interface resistance, improve the problem of blocked electron transport path, and improve the electron transport efficiency.
[0035] In one embodiment, a first conductive portion 120 is provided on each of the opposite sides of the current collector 110, and the aforementioned active body 130 is provided on each of the first conductive portions 120 on both sides. A plurality of first holes 111 penetrate the current collector 110 along the thickness direction, and the first conductive portions 120 on both sides of the current collector 110 are electrically connected to the second conductive portions within the first holes 111. In this way, the electron transport efficiency between the active bodies 130 on both sides and the current collector 110 can be increased, thereby improving the charge / discharge rate performance.
[0036] In one embodiment, a plurality of first holes 111 are arranged in an array on the current collector 110, with the same number of first holes 111 in each column. This makes it easy to quickly form a plurality of first holes 111 on the current collector 110, thereby improving the processing efficiency of the plurality of first holes 111.
[0037] In one embodiment, a plurality of first holes 111 can be formed on the current collector 110 by means of laser processing, chemical etching or other methods.
[0038] The electrode 100 provided in this application embodiment, by providing a first conductive portion 120 between the current collector 110 and the active body 130, and by providing a plurality of first holes 111 on the current collector 110, with the second conductive portion filling the plurality of first holes 111, can achieve at least the following technical effects: First, the first conductive portion 120 and the second conductive portion themselves have high conductivity, and can form a continuous conductive network between the current collector 110 and the active body 130. This effectively reduces interface resistance, improves the problem of blocked electron transport paths, and increases electron transport efficiency; Second, the second conductive portion fills the first holes 111. Within the first hole 111, the second conductive part is electrically connected to the first conductive part 120, which increases the contact area between the first conductive part 120 and the current collector 110. This further reduces the interface resistance, improves the problem of blocked electron transport paths, and increases electron transport efficiency. Third, the second conductive part fills the first hole 111 and is electrically connected to the first conductive part 120, so that the first conductive part 120 and the second conductive part can form a three-dimensional conductive network in the thickness direction of the current collector 110. This further reduces the interface resistance, improves the problem of blocked electron transport paths, and increases electron transport efficiency.
[0039] It should be noted that the porosity of the current collector 110 is B. Porosity can be understood as the percentage between the volume of the multiple first pores 111 and the volume of the current collector 110.
[0040] It should be understood that if the porosity B is too large, it will affect the overall structural strength of the current collector 110 and shorten its service life. If the porosity B is too small, the second conductive part will not be easy to fill the first hole 111, which will result in a smaller contact area between the first conductive part 120 and the current collector 110. This will easily increase the interface resistance between the first conductive part 120 and the current collector 110 and affect the electron transmission efficiency.
[0041] Therefore, in this embodiment, the porosity B of the current collector 110 is limited to the following range: 50% ≤ B ≤ 80%. This effectively improves the aforementioned problems caused by a large or small porosity B.
[0042] In one embodiment, the porosity B of the current collector 110 can be selected as 50%, 60%, 80%, etc.
[0043] It should be noted that the first conductive part 120 and / or the second conductive part may include a conductive polymer.
[0044] Firstly, conductive polymers possess high electrical conductivity, approaching that of metals, effectively reducing interfacial resistance and improving electron transport efficiency. Secondly, conductive polymers are typically high-molecular-weight materials with a degree of flexibility. During changes in the volume of the active body 130, they act as a buffer between the active body 130 and the current collector 110, preventing stress from directly acting on the active body 130 and thus preventing breakage. Thirdly, conductive polymers exhibit good ductility. Specifically, the surface of the current collector 110 has a microscopic rough structure; the ductile conductive polymer can better fill these grooves, achieving a tighter fit. This effectively increases the contact area between the conductive polymer and the current collector 110, reducing interfacial resistance and improving electron transport efficiency.
[0045] In one embodiment, the conductive polymer may include polyaniline (PAN I), polythiophene (PT), polyacetylene (PA), etc.
[0046] In one embodiment, the first conductive portion 120 and the second conductive portion may be made of the same type of conductive polymer. For example, both the first conductive portion 120 and the second conductive portion may be made of polyaniline (PAN I).
[0047] In one embodiment, the first conductive portion 120 and the second conductive portion may also be made of different types of conductive polymers. For example, the first conductive portion 120 may be made of polyaniline (PAN I), and the second conductive portion may be made of polythiophene (PT).
[0048] In one embodiment, a second conductive portion can be filled into the first hole 111 first, and then a first conductive portion 120 can be formed by coating the surface of the current collector 110.
[0049] In one embodiment, a first conductive layer can be directly coated on the current collector 110, a portion of which fills the first hole 111 to form a second conductive portion; the other portion of the first conductive layer is disposed on the surface of the current collector 110 to form a first conductive portion 120.
[0050] like Figure 2 As shown, the active body 130 may include a second conductive layer 131 and an active layer 132. The second conductive layer 131 is disposed on the side of the first conductive portion 120 away from the current collector 110, and the active layer 132 is disposed on the side of the second conductive layer 131 away from the first conductive portion 120.
[0051] It should be noted that the second conductive layer 131 is in direct contact with the first conductive part 120, and electrons can be rapidly transferred between the second conductive layer 131 and the first conductive part 120.
[0052] It should be noted that during the coating process, the second conductive layer 131 and the active layer 132 are coated on the first conductive portion 120, and the second conductive layer 131 and the active layer 132 can form an integrated structure. The aforementioned second conductive portion fills into a plurality of first holes 111, and the first conductive portion 120 and the second conductive portion are electrically connected. The first conductive portion 120, the second conductive portion, and the current collector 110 can also form an integrated structure. In this way, on the one hand, the integrated structure of the second conductive layer 131 and the active layer 132 can increase the contact area between the second conductive layer 131 and the active layer 132, reduce the interface resistance, and improve the electron transport efficiency between the second conductive layer 131 and the active layer 132; on the other hand, the integrated structure of the first conductive portion 120, the second conductive portion, and the current collector 110 can increase the contact area between the first conductive portion 120 and the current collector 110, reduce the interface resistance, and improve the electron transport efficiency between the first conductive portion 120 and the current collector 110. By combining the aforementioned first conductive part 120 with the second conductive layer 131 in direct contact, the electron transfer efficiency between the active layer 132 and the current collector 110 can be further improved.
[0053] In one embodiment, the second conductive layer 131 may include an inorganic conductive layer, which can be understood as a conductive material obtained primarily from inorganic materials. Compared to the aforementioned conductive polymers, inorganic conductive layers exhibit higher conductivity and higher electron transport efficiency. It should be noted that the reason why inorganic conductive layers were not used for the first conductive portion 120 and the second conductive portion is that: the first conductive portion 120 and the second conductive portion need to be in direct contact with the current collector 110; therefore, good ductility needs to be considered when selecting materials for the first conductive portion 120 and the second conductive portion. Thus, in practical applications, conductive polymers with high conductivity and excellent ductility are typically selected for the first conductive portion 120 and the second conductive portion.
[0054] In one embodiment, the inorganic conductive layer may include carbon nanotubes, graphene, etc.
[0055] It should be noted that during the charging and discharging process, the active layer 132 can achieve the insertion and extraction of ions through redox reactions, as well as the conduction of electrons through external circuits, thereby achieving the beneficial effects of storing and releasing electrical energy.
[0056] In one implementation, the active layer 132 can be selected from NCM811 (lithium nickel cobalt manganese oxide), NCA (nickel cobalt aluminum), NCMA (nickel cobalt manganese aluminum), etc. All of the above materials have high capacity characteristics and can be used in high-capacity battery cells.
[0057] It should be noted that, in practical applications, the first conductive part 120 and the second conductive layer 131 can be relatively fixed together using an adhesive to prevent delamination and cracking. The adhesive can fill the gaps between the first conductive part 120 and the second conductive layer 131, increasing the contact area between them, reducing interface resistance, and improving electron transport efficiency.
[0058] In one embodiment, the adhesive may be an organic adhesive; alternatively, an inorganic adhesive may also be used. Related technologies provide detailed descriptions of the material selection for both organic and inorganic adhesives, which will not be repeated here.
[0059] like Figure 2 As shown, the active body 130 may further include a protective layer 133, which is disposed on the side of the active layer 132 away from the second conductive layer 131.
[0060] It should be noted that in practical applications, the active layer 132 is in contact with the electrolyte, and ions can be conducted to the active layer 132 or from the active layer 132 to the electrolyte, achieving charge balance through ion intercalation and deintercalation.
[0061] It should be noted that during the contact between the active layer 132 and the electrolyte, in addition to the aforementioned ion intercalation / deintercalation reaction, side reactions also occur between the active layer 132 and the electrolyte. These side reactions can easily lead to the production of byproducts with high impedance (such as Li2CO3) on the surface of the active layer 132, which can affect the ion conduction efficiency. Furthermore, some side reactions also generate a significant amount of heat, affecting the performance of the active layer 132. Therefore, a protective layer 133 is provided on the surface of the active layer 132 (the side of the active layer 132 facing away from the second conductive layer 131). On the one hand, the protective layer 133 has ion conductivity, and ions in the electrolyte can achieve intercalation-deintercalation reaction with the active layer 132 through the protective layer 133, that is, the protective layer 133 will not affect the ion conduction efficiency. On the other hand, the protective layer 133 can block the electrolyte and the active layer 132, preventing the electrolyte from directly contacting the active layer 132. This can effectively suppress side reactions between the electrolyte and the active layer 132, prevent side reaction products from affecting the ion conduction efficiency, and reduce the heat generated by side reactions of the electrolyte, improve the thermal stability of the active layer 132, and extend the service life of the active layer 132.
[0062] It should be noted that the protective layer 133 may include a ceramic layer. Firstly, the ceramic layer possesses excellent corrosion resistance, enabling it to permanently isolate the electrolyte from the active layer 132 and prevent side reactions between them. Secondly, the ceramic layer possesses high mechanical strength, providing rigid support, improving the overall structural strength of the active body 130, and extending its service life.
[0063] In one embodiment, the ceramic layer may include Al2O3, TiO2, AlN, etc.
[0064] Figure 4 This is a schematic diagram of the structure of the active layer provided in an exemplary embodiment of this application. Figure 4 As shown, the active layer 132 is provided with a plurality of second holes 1321, which penetrate the active layer 132 along the thickness direction of the active layer 132.
[0065] It should be understood that in related technologies, when the active layer 132 does not have a second pore 1321, ions need to gradually diffuse from the surface of the active layer 132 to its interior, resulting in a low diffusion rate. However, with the second pore 1321 provided in the active layer 132, ions can quickly reach the interior of the active layer 132 through the second pore 1321. In this way, the second pore 1321 can serve as a channel for rapid ion diffusion, shortening the ion diffusion path and effectively increasing the ion diffusion rate.
[0066] It should be noted that, as mentioned earlier, after the active layer 132 is provided with the second pore 1321, ions can quickly diffuse into the interior of the active layer 132 during charging and discharging. This has several advantages: first, it can improve the problem of polarization easily occurring on the surface of the active layer 132; second, the active layer 132 is less prone to side reactions in a low polarization state, which can reduce structural damage to the active layer 132 and thus extend the cycle life of the battery cell; third, the increased ion diffusion rate can support rapid ion transport under high current, effectively improving the fast charging performance of the battery cell.
[0067] In one embodiment, a plurality of second holes 1321 are arranged in an array on the active layer 132, with the same number of second holes 1321 in each column. This allows for the rapid formation of a plurality of second holes 1321 on the active layer 132, thereby improving the processing efficiency of the plurality of second holes 1321.
[0068] In one embodiment, after the active layer 132 can be coated, a plurality of second pores 1321 are formed on the active layer 132 by a directional freeze-drying process.
[0069] It should be noted that, as Figure 3As shown, the pore size of the second pore 1321 is A. If the pore size of the second pore 1321 is too large, it will affect the overall structural integrity of the active layer 132, causing the active layer 132 to crack during the volume expansion or contraction process of charging and discharging; if the pore size of the second pore 1321 is too small, it will affect the diffusion rate of ions and significantly increase the difficulty of processing and manufacturing.
[0070] Therefore, in this embodiment, the aperture A of the second hole 1321 is limited to the following range: 0.1μm ≤ A ≤ 1μm. This effectively improves the aforementioned problems caused by the aperture A of the second hole 1321 being too large or too small.
[0071] It should be noted that, as mentioned above, the active body 130 in this embodiment adopts a three-layer structure, which allows the active body 130 to have the advantages of high conductivity, high capacity, and long lifespan. Specifically, firstly, by bonding the second conductive layer 131 to the first conductive part 120, the electron transport efficiency can be improved. Furthermore, by integrating the second conductive layer 131 and the active layer 132, the contact area between the second conductive layer 131 and the active layer 132 can be increased, reducing the interface resistance and improving the electron transport efficiency between the second conductive layer 131 and the active layer 132, thereby achieving high conductivity of the active body 130. Secondly, the active layer 132 itself is made of a material with high capacity characteristics, thereby achieving high capacity performance of the active body 130. Thirdly, the protective layer 133 reduces side reactions between the electrolyte and the active layer 132, improves the thermal stability of the active layer 132, and extends the lifespan of the active layer 132.
[0072] It should be noted that in practical applications, the active body 130 can achieve a three-layer structure through an integrated coating process in a single coating. Furthermore, during the coating process, a freeze-drying process can be used to form multiple second pores 1321 on the active layer 132. This effectively simplifies the process flow, reduces production costs, and prevents the risk of peeling between different layers in the active body 130.
[0073] The embodiments of this application will be further described below in conjunction with the manufacturing process of electrode 100.
[0074] For the preparation of the current collector 110 and the first conductive layer: multiple first holes 111 can be formed by laser processing on the current collector 110. The current collector 110 is immersed in a solution of conductive polymer and vacuum pressurized so that the conductive polymer fills the first holes 111. After curing, the conductive polymer filled into the first holes 111 forms the second conductive part 120. The conductive polymer applied to the surface of the current collector 110 forms the first conductive part 120. The first conductive part 120, the second conductive part and the current collector 110 form an integrated structure.
[0075] For the coating of active body 130: a multi-stage slit extrusion integrated coating technology is used to coat the second conductive layer 131, the active layer 132 and the protective layer 133. Through a drying and curing process, the second conductive layer 131, the active layer 132 and the protective layer 133 form an integrated structure.
[0076] For the formation of the second pore 1321, after the active layer 132 is coated, a directional freezing (freezing temperature is usually in the range of -30℃ to -50℃) and vacuum drying process is used to form multiple second pores 1321 in the active layer 132.
[0077] This application embodiment also provides a battery cell, which may include the electrode 100 as described in the previous embodiment and has all the functions of the electrode 100. It should be noted that the beneficial effects of this battery cell can be referred to the beneficial effects of the aforementioned electrode 100.
[0078] In one embodiment, the battery cell may further include a separator, a housing, etc. The separator is disposed between the positive electrode and the negative electrode to prevent the positive electrode and the negative electrode from directly contacting each other, but allows ions to pass through without affecting the redox reaction. The electrode 100 is disposed inside the housing, which provides protection and a sealed environment.
[0079] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0080] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.
[0081] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.
[0082] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0083] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. An electrode sheet, characterized in that, include: The current collector has multiple first holes; The first conductive layer includes a first conductive portion and a second conductive portion. The first conductive portion is disposed on at least one side of the current collector, and the second conductive portion is filled into a plurality of the first holes. The second conductive portion is electrically connected to the first conductive portion. An active material is disposed on the side of the first conductive portion away from the current collector.
2. The electrode sheet according to claim 1, characterized in that, The first conductive portion and / or the second conductive portion comprises a conductive polymer.
3. The electrode sheet according to claim 2, characterized in that, The active body includes: The second conductive layer is disposed on the side of the first conductive portion away from the current collector; An active layer is disposed on the side of the second conductive layer opposite to the first conductive portion.
4. The electrode sheet according to claim 3, characterized in that, The second conductive layer includes an inorganic conductive layer.
5. The electrode sheet according to claim 3, characterized in that, The active agent further includes: A protective layer is disposed on the side of the active layer opposite to the second conductive layer.
6. The electrode sheet according to claim 5, characterized in that, The protective layer includes a ceramic layer.
7. The electrode sheet according to claim 3, characterized in that, The active layer is provided with a plurality of second holes, which penetrate the active layer along the thickness direction of the active layer.
8. The electrode sheet according to claim 7, characterized in that, The aperture of the second hole is A, and A satisfies: 0.1μm≤A≤1μm.
9. The electrode sheet according to any one of claims 1 to 8, characterized in that, The porosity of the current collector is B, which satisfies: 50% ≤ B ≤ 80%; wherein, the porosity represents the percentage between the volume of the plurality of first pores and the volume of the current collector.
10. A battery cell, characterized in that, include: The electrode as described in any one of claims 1 to 9.