Electrode plate manufacturing method, electrode plate and battery

Abstract

The invention relates to an efficient electrode pole piece manufacturing method which can efficiently remove crystal water in a battery pole piece and improve the production efficiency and the battery performance. Comprising the following steps: forming a through hole in a metal foil, uniformly coating the surface of the metal foil with slurry, automatically rolling the coated metal foil into a pole piece roll core, placing the pole piece roll core in a vacuum oven, and heating and baking in a negative pressure environment to remove crystal water and cure an electrode material. The metal foil can be designed into a multi-layer stacked structure, a through hole is formed in each metal sub-layer, and the centers of the through holes in the adjacent layers are not overlapped, so that the binding force of the electrode material can be improved while the discharge efficiency of crystal water is enhanced. The method is particularly suitable for being applied to sodium battery positive electrode materials such as Prussian blue and white systems, and the dehydration effect and the production efficiency are both improved. The electrode plate provided by the invention has lower water content after baking, higher drying efficiency and better cycle attenuation performance and energy density.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrode plate manufacturing method, an electrode plate and a battery. Background Art

[0002] As the global demand for clean energy continues to grow, the battery industry is developing at an unprecedented speed, and the improvement of battery performance and the guarantee of safety have become the focus of the industry. In particular, in the process of battery preparation, how to effectively control and minimize the moisture content is directly related to the energy density, cycle life and safety of the battery, and is one of the current problems that need to be solved urgently. Among many new battery technologies, sodium-ion batteries stand out for their advantages such as abundant resources, high cost-effectiveness and environmental friendliness. In particular, their positive electrode materials Prussian blue and its analogues (PB and PBAs) show commercial potential due to their unique three-dimensional rigid open skeleton structure, high theoretical specific capacity, flexible structural adjustability and simple and easy synthesis path.

[0003] However, the inherent challenge of these materials lies in the widespread vacancies and large amounts of crystal water in their crystal skeletons. These water contents are difficult to be completely removed during the vacuum drying stage of conventional electrode manufacturing, which becomes a factor restricting the improvement of battery performance. At present, the industry generally uses aluminum foil as the current collector of battery electrodes, and enhances the conductivity and adhesion of the electrodes by coating them with conductive carbon. However, this manufacturing method exposes the following defects in the drying process: the trace water and crystal water in the electrodes are difficult to completely remove through the traditional vacuum drying process, especially the water inside the electrode core, which greatly reduces the drying efficiency and effect. The trace water or crystal water that is not completely removed may cause a series of problems such as structural collapse and gas production from the decomposition of crystal water during the use of the battery, which seriously damages the performance stability and safety of the battery cell.

[0004] Therefore, it is necessary to develop an innovative electrode plate manufacturing method that can efficiently and thoroughly remove the crystal water in Prussian blue and its analogues electrode materials while maintaining good conductivity and structural stability of the electrode plate. Summary of the invention

[0005] The purpose of the present application is to provide a method for manufacturing an electrode plate, which can efficiently remove the crystal water in the battery plate and improve the infiltration effect and liquid retention capacity of the electrolyte inside the battery cell. The method for manufacturing the electrode plate of the present application includes: Processing the metal foil to form through holes penetrating the metal substrate on the metal foil; The electrode material slurry is evenly coated on the surface of the metal foil by slurry coating; Rolling up the metal foil coated with the electrode material slurry to form an electrode winding core; Placing the electrode core in a vacuum oven and baking the electrode core under negative pressure to form an electrode; Wherein, the aperture of the through hole is in the range of 0.001-10 μm.

[0006] In one embodiment, the step of processing the metal foil specifically includes forming a through hole on the metal sub-layer, stacking two or more metal sub-layers, and having a gap penetrating the metal foil after stacking.

[0007] In one of the embodiments, through holes of the same size and arrangement distribution are formed on each of the metal sub-layers, the centers of the through holes in adjacent metal sub-layers do not overlap, and the apertures of the through holes are in the range of 1-40 μm.

[0008] In one embodiment, the through hole manufacturing method is selected from electron beam etching, chemical etching or laser drilling, and the slurry coating method is selected from transfer coating, extrusion coating or spraying.

[0009] The present application also provides an electrode plate, which is obtained by the aforementioned manufacturing method, and specifically comprises a metal foil material and an electrode material layer; The metal foil material includes a through hole penetrating the metal substrate, and the aperture of the through hole is in the range of 0.001 to 100 μm; The electrode material layer is formed on the surface of the metal foil by slurry coating.

[0010] In one embodiment, the metal foil comprises a plurality of stacked metal sub-layers, and each of the metal sub-layers comprises through holes arranged in a regular and orderly manner.

[0011] In one embodiment, the centers of the through holes of adjacent metal sub-layers do not overlap, and after being stacked, there is a gap that penetrates the metal foil.

[0012] In one of the embodiments, the through hole is perpendicular to the winding direction of the pole piece.

[0013] In one embodiment, the metal foil is selected from pure aluminum foil, pure copper foil, composite aluminum foil or composite copper foil.

[0014] The present application further provides a battery, the positive electrode and / or negative electrode of which adopts the aforementioned electrode plate.

[0015] Compared with the prior art, the present application has the following beneficial effects: the electrode plate manufacturing method of the present application improves the removal efficiency of crystal water by forming a through hole on the metal foil and using negative pressure baking technology, and optimizes the performance of the electrode plate. The metal foil is formed with through holes with a pore size in the range of 0.001~10μm. Through a special directional arrangement, it is ensured that the crystal water molecules can smoothly pass through the pore overlap points between the layers to move to the surface of the plate, thereby improving the dehydration efficiency and reducing the baking time, thereby improving the production efficiency of the battery plate. At the same time, the porous structure enhances the wettability and liquid retention of the electrolyte and improves the performance of the battery cell. In addition, the metal foil can be selected to be composed of multiple stacked metal sublayers, each sublayer is formed with through holes of the same size and arrangement distribution, and the through hole centers of adjacent sublayers do not overlap. The non-overlapping through hole design ensures the stability of the structure and avoids stress concentration problems.

[0016] The porous structure of the electrode plate made by the method of the present application not only improves the dehydration efficiency, but also enhances the wettability and liquid retention of the electrolyte, reduces the polarization of the battery cell, and improves the energy density and cycle attenuation performance of the battery cell. The porous structure also promotes the "anchoring effect" of the positive electrode material, improves the adhesion of the electrode material, reduces the amount of glue used, and improves the overall performance of the core. The electrode plate manufacturing method of the present application and the electrode plate and battery made therefrom, while improving the dehydration efficiency and reducing the production cost, also optimizes the performance of the battery, and has application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of a method for manufacturing an electrode sheet in one embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a battery electrode in one embodiment of the present application; Figure 3 It is a schematic diagram of the overall structure of the metal foil in the battery electrode of the present application; Figure 4 It is a schematic diagram of a partial structural cross-section of a metal foil in a battery electrode of the present application; Figure 5 This is a comparison chart of the water content of electrodes of different substrates after baking under the same conditions; Figure 6 It is a comparison chart of the results of battery cell cycle capacity attenuation with different substrate electrode core layers.

[0018] Description of reference numerals: 100, metal foil; 110, metal sublayer; 200, electrode material layer; 300, through hole. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] Among the many links in battery preparation, the production of electrode plates is particularly critical, which directly affects the energy density, cycle life and safety of the battery, and is related to the efficiency and cost of the entire battery production process. The problem of difficult to effectively remove the crystal water in the traditional electrode plate production process is a major bottleneck restricting the improvement of battery performance. In order to overcome this problem, this application proposes an innovative electrode plate production method, which introduces tiny through holes 300 penetrating through the traditional metal foil 100 and combines it with an optimized negative pressure baking process to achieve efficient removal of crystal water in the electrode plate. Please refer to Figure 1 , Figure 1 : is a flow chart of a method for manufacturing an electrode sheet in an embodiment of the present application, which can efficiently remove the crystal water in the battery sheet and improve the production efficiency of the battery sheet. The method for manufacturing the electrode sheet specifically includes: The metal foil 100 is processed to form a through hole 300 penetrating the metal substrate on the metal foil 100, and the electrode material slurry is evenly coated on the surface of the metal foil 100 by slurry coating. The metal foil 100 coated with the electrode material slurry is rolled up to form a pole piece core, and the pole piece core is placed in a vacuum oven and negative pressure baked to form an electrode pole piece, wherein the aperture of the through hole 300 is in the range of 0.001~10μm.

[0023] First, a metal foil 100 (such as copper foil or aluminum foil) with high purity and excellent conductivity is selected, and impurities such as oil and oxide on the surface are removed through a fine cleaning process to ensure good adhesion of the subsequent coating. Subsequently, a series of through holes 300 penetrating the metal substrate are uniformly and accurately formed on the metal foil 100 using high-precision technologies such as laser drilling or electrochemical corrosion. The electrode material slurry is prepared using advanced stirring and dispersing technology to evenly mix the active material, conductive agent, binder and appropriate amount of solvent in a predetermined proportion to prepare a high solid content, low viscosity, uniform and stable electrode material slurry.

[0024] Using a precision coating machine, using advanced coating technologies such as slit extrusion, spraying or die extrusion, the electrode material slurry is evenly and accurately coated on the surface of the pre-treated metal foil 100. This process strictly controls the coating speed, thickness and uniformity to ensure that the coating quality meets the design requirements, reduce material waste, and improve battery performance consistency. The coated metal foil 100 is smoothly fed into the automatic winding device for tight and uniform winding to form a pole piece core. During the winding process, the tension and density of the core are monitored in real time to avoid defects such as wrinkles and breaks, and to ensure the integrity and structural strength of the pole piece core.

[0025] Negative pressure baking and curing is to place the electrode core in a high vacuum oven, and deeply bake the electrode through a precisely controlled heating program and negative pressure environment. The negative pressure environment helps to accelerate the evaporation of the solvent, reduce the generation of bubbles during the baking process, and avoid adverse reactions between the material and oxygen, moisture, etc. in the air. The baking process ensures the full curing and tight bonding of the electrode material, and improves the structural stability and electrochemical performance of the electrode.

[0026] The crystal water in the electrode material turns into gaseous water molecules at high temperature, moves to the electrode surface through the micropores on the foil surface, and is finally discharged from the electrode core surface. Since the pores of the substrate are arranged in a special direction, even if the core has several layers, the crystal water molecules can still move to the core surface through the pore overlap points between each layer, which greatly improves the dehydration efficiency. Since there are more pores in the porous foil, there are more routes for water molecules to escape. Under the same baking conditions, the battery made of porous substrate has a significant dehydration effect compared with the battery made of ordinary substrate.

[0027] Specifically, the processing step of the metal foil 100 specifically includes forming through holes on the metal sublayer 110, stacking two or more layers of the metal sublayers 110, and having a gap that penetrates the metal foil 100 after stacking. In a further scheme, through holes of the same size and arrangement distribution are formed on each of the metal sublayers 110, the centers of the through holes in adjacent metal sublayers 110 do not overlap, and the aperture of the through holes is in the range of 1-40 μm. Through advanced laser drilling or micro-machining technology, micro-through holes are formed on the metal sublayer 110, and these through holes are not only precisely controllable in size and uniformly distributed, but also stack two or more layers of processed metal sublayers 110, and high-precision positioning technology is used during the stacking process. The through holes of two adjacent metal sublayers 110 are arranged in a staggered manner, that is, the position of the through holes in the upper layer does not completely overlap with the position of the through holes in the lower layer, thereby forming a tortuous channel network in the vertical direction. This staggered stacking design not only ensures that there are vertical channels throughout the entire thickness of the metal foil 100, providing an efficient path for the penetration of electrolytes or active substances, but also provides additional space for accommodating electrode materials. These spaces can serve as "anchor points" to effectively enhance the bonding force between the electrode material and the metal foil 100, and prevent the performance degradation caused by the electrode material falling off or expanding during the charging and discharging process. At the same time, the increased electrode material loading also directly improves the energy density and cycle stability of the battery or supercapacitor. The staggered stacked through-hole structure enhances the overall mechanical strength of the metal foil 100, making it more resistant to stress changes generated during the charging and discharging process. The vertical and tortuous channel network promotes the uniform and rapid penetration of the electrolyte, improves the efficiency of the electrochemical reaction, and thus improves the performance of the battery or supercapacitor.

[0028] In the manufacturing process of the metal foil 100, the production of through holes and the coating of slurry are two important links that affect the performance and quality of the final product. In terms of the method for producing through holes, this application selects electron beam etching, chemical etching or laser drilling, and the slurry coating method selects transfer coating, extrusion coating or spraying. Whether it is electron beam etching, chemical etching or laser drilling, it can achieve micron-level or even nanometer-level processing accuracy to ensure that the size, shape and position of the through hole are accurate. Different technical methods are suitable for different materials, sizes and shape requirements, providing process selection space, which can significantly improve production efficiency and shorten production cycle.

[0029] The battery pole piece of the present application can be used as a positive electrode of a battery or a negative electrode of a battery. For example, when it is applied to the positive electrode of a battery, the positive electrode material of the battery can be selected from lithium battery materials, sodium battery materials, solid-state battery materials, calcium ion battery materials, etc. The lithium battery material can be selected from lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, lithium manganate and ternary materials, etc., and the sodium battery material can be selected from Prussian blue, white system, polyanion system, layered oxide system. The electrode pole piece manufacturing method of the present application is particularly suitable for sodium battery materials, especially for Prussian blue and white system sodium ion battery positive electrode materials. Through the method of the present application, after the winding is completed, the internal water can be conveniently discharged through the through hole, and there is no need to add additional dehydration processing steps and processing stations during the winding process, reducing the improvement of the winding equipment. The battery pole piece can be normally wound during the manufacturing process, and after the winding is completed, multiple coils can be uniformly placed in a vacuum drying device for drying at the same time, and this process is unified and processed in large quantities, which can optimize the production efficiency.

[0030] In addition, in order to ensure that there is a moisture removal path and that it is evenly distributed, in a further technical solution, the aperture of the through hole 300 is greater than the distance between adjacent through holes 300, so that the uncovered hole area can be retained regardless of how it is wound. In the method of forming the metal foil 100 with multiple sub-layers, this setting rule is also adopted to ensure the existence of the moisture removal path, which is conducive to improving the dehydration efficiency, thereby improving the production efficiency.

[0031] See also Figure 2 , Figure 2 : is a schematic diagram of the structure of a battery pole piece in an embodiment of the present application. The present application also provides an electrode pole piece, which is obtained by the aforementioned manufacturing method, specifically comprising a metal foil 100 and an electrode material layer 200. The metal foil 100 comprises a through hole 300 penetrating the metal substrate, and the aperture of the through hole 300 is in the range of 0.001 to 100 μm. The electrode material layer 200 is formed on the surface of the metal foil 100 by slurry coating. The electrode pole piece is mainly composed of two parts: a metal foil 100 and an electrode material layer 200 covering its surface. The metal foil 100, as the substrate of the electrode pole piece, carries active materials to ensure the effective transmission of electrons. There are countless fine through holes 300 running through the inside. The through holes 300 are conducive to the discharge of water inside the coil during the manufacturing process. The structure can also promote the rapid penetration and diffusion of the electrolyte, improve the efficiency of the electrochemical reaction, and effectively alleviate the internal stress caused by the volume change during the charging and discharging process, thereby extending the service life of the electrode. The electrode material layer 200 is evenly and tightly attached to the surface of the metal foil 100 through slurry coating technology. The coating process adopts a high-precision and high-uniformity coating method, such as transfer coating, extrusion coating or spraying, to ensure that the thickness of the electrode material layer 200 is consistent and the coverage is uniform.

[0032] Please read further Figure 3 to Figure 4 , Figure 3 It is a schematic diagram of the overall structure of the metal foil 100 in the battery electrode of the present application. Figure 4 It is a schematic diagram of the partial structural cross-section of the metal foil 100 in the battery electrode of the present application. Specifically, the metal foil 100 includes a plurality of stacked metal sublayers 110, and each of the metal sublayers 110 includes through holes 300 arranged in an orderly manner according to a regular pattern. Inside each metal sublayer 110, through holes 300 arranged in an orderly manner according to a strict regular pattern are introduced. The through holes 300 not only optimize the weight distribution of the material and reduce the overall mass, but also significantly enhance the water permeability, while improving the bonding strength and retaining sufficient mechanical strength and electrical / thermal conductivity. By finely controlling the pore size, shape, distribution density and arrangement, the above requirements can be controlled. For example, by selecting relatively large pores to form larger-sized through holes 300, the water permeability efficiency can be improved.

[0033] Specifically, the centers of the through holes 300 of the adjacent metal sub-layers 110 do not overlap, and there is a gap that penetrates the metal foil 100 after stacking. Since the centers of the through holes 300 do not overlap, a portion that can pass directly (regarded as a through hole 300 as a whole) and a portion similar to a groove are formed, which is conducive to the fixation of the electrode material. In a further technical solution, multiple sub-layers select through holes 300 of different sizes and orderly arrangement. In this way, in the metal foil 100 formed after stacking, due to size differences and distribution, for example, the center layer uses larger holes, and the two layers use relatively small holes, a regular through hole 300 structure and surface morphology will not be formed, which is conducive to the anchoring of the electrode material, thereby improving stability.

[0034] Specifically, the through hole 300 is perpendicular to the winding direction of the pole piece. The through hole 300 is perpendicular to the winding direction. First, it is beneficial for the battery pole piece formed into a coil to be dehydrated. The water removal path is perpendicular to the surface of the coil, which can form the shortest path, which is beneficial to the rapid removal of water. In addition, in specific applications, it is beneficial for the electrolyte to penetrate more quickly and evenly between the pole pieces. This layout reduces the resistance to the flow of the electrolyte, allowing the battery to reach electrochemical equilibrium faster during the charge and discharge process, thereby improving the response speed and cycle stability of the battery. By precisely controlling the position and size of the through hole 300, the effective area of ​​the pole piece can be maximized for coating the active material while ensuring the electrolyte penetration and heat dissipation performance, thereby improving the energy density of the battery without sacrificing battery safety.

[0035] Specifically, the metal foil 100 is selected from one of pure aluminum foil, pure copper foil, composite aluminum foil or composite copper foil.

[0036] The present application further provides a battery, whose positive electrode and / or negative electrode adopts the aforementioned electrode plate, and at least one electrode plate in the positive electrode or the negative electrode of the battery is made by the method of the present application. The battery can be a lithium battery, a sodium battery, a solid-state battery, a calcium ion battery, or other battery with an electrode plate.

[0037] See also Figure 5 , Figure 5 It is a comparison chart of the water content of electrodes made of different substrates after baking under the same conditions. Compared with the electrode electrodes made of traditional foils, the electrode electrodes obtained by the manufacturing method of the present application can significantly reduce the water content of the electrode electrodes after baking. It can be seen that a large number of submicron through holes are prepared on the surface of metal foils 100 such as copper and aluminum. During the drying process, the crystal water inside the material and the electrode core can continuously move to the surface of the electrode and the core through the micropores on the foil surface, and finally leave the electrode. This provides more paths for the crystal water to leave, so that the crystal water inside the electrode and the core can be controlled at a lower level, effectively improving the drying effect, and also reducing the drying time, improving production efficiency, and reducing production costs.

[0038] Please read further Figure 6 , Figure 6 This is a comparison chart of the results of the cell cycle capacity attenuation of different substrate electrode core layers. The electrode electrode formed by the manufacturing method of this application has a porous structure. The battery made of a porous substrate has better cycle attenuation performance than the battery with an ordinary substrate. The presence of a large number of micropores not only improves the roughness of the foil surface, but also allows the positive electrode material to be embedded in the pores to form an "anchoring effect". Thanks to the large number of pores distributed in the substrate, the electrolyte has better wettability and liquid retention, which can effectively improve the adhesion of the electrode material, reduce the amount of glue used, increase the proportion of active substances, and improve the overall energy density of the battery. The micropores inside the substrate can provide more space for the electrolyte, and the electrolyte can fully penetrate on both sides of the substrate through the micropores, improve the infiltration of the electrolyte in the thick electrode, reduce the polarization of the battery cell, and improve the performance of the battery cell.

[0039] As can be seen from the above, the present application proposes a new method for manufacturing electrode plates, which can effectively remove the crystal water in the plates, thereby improving the production efficiency of battery plates. While taking into account the production efficiency, it can also improve the performance of the battery cell by improving the bonding strength of the electrode material and the wettability and liquid retention of the electrolyte. The method includes: through-hole production, using high-precision technologies such as laser drilling, electrochemical corrosion or electron beam etching to form a series of through-holes that penetrate the substrate on the metal foil, and through slit extrusion, spraying or die extrusion and other coating technologies, the slurry is evenly coated on the surface of the pretreated metal foil, and the coated metal foil is automatically rolled into a pole plate core, and then the pole plate core is placed in a high vacuum oven, and dehydrated through a precisely controlled heating program and a negative pressure environment, while ensuring that the electrode material is fully solidified and tightly bonded.

[0040] The specially designed porous metal foil not only forms a vertical and tortuous channel network through the through holes of the multi-layer metal sublayer, but also improves the discharge efficiency of the crystal water, and also enhances the binding force of the electrode material and the cycle stability of the battery. At the same time, the porous structure promotes the rapid penetration of the electrolyte, improving the electrochemical performance and energy density of the battery. The electrode plate of the present application is suitable for a variety of battery types, such as lithium batteries, sodium batteries, solid-state batteries and calcium ion batteries, especially in the application of sodium battery positive electrode materials such as Prussian blue and white systems, showing excellent dehydration effect and production efficiency. Compared with the electrode plate made of traditional foil, the method of the present application significantly reduces the water content after baking, improves the drying effect and production efficiency, and improves the cycle attenuation performance and energy density of the battery.

[0041] The above is only a specific implementation of the present application, and any other improvements made based on the concept of the present application are deemed to be within the protection scope of the present application.

Claims

1. A method for manufacturing an electrode sheet, characterized in that: include: Processing the metal foil (100) to form a through hole (300) penetrating the metal substrate on the metal foil (100); By means of slurry coating, the electrode material slurry is evenly coated on the surface of the metal foil (100); Rolling up the metal foil (100) coated with the electrode material slurry to form an electrode sheet core; Placing the electrode core in a vacuum oven and baking the electrode core under negative pressure to form an electrode; Wherein, the aperture of the through hole (300) is in the range of 0.001-10 μm.

2. The method for manufacturing an electrode sheet according to claim 1, characterized in that: The processing steps of the metal foil (100) specifically include forming a through hole on the metal sublayer (110), and stacking two or more layers of the metal sublayer (110), so that after stacking, there is a gap that penetrates the metal foil (100).

3. The method for manufacturing an electrode sheet according to claim 2, characterized in that: Through holes of the same size and arrangement distribution are formed on each of the metal sub-layers (110); the centers of the through holes in adjacent metal sub-layers (110) do not overlap; and the apertures of the through holes are within the range of 1-40 μm.

4. The method for manufacturing an electrode sheet according to claim 2, characterized in that: The through hole manufacturing method is selected from electron beam etching, chemical etching or laser drilling, and the slurry coating method is selected from transfer coating, extrusion coating or spraying.

5. An electrode sheet obtained by the manufacturing method according to any one of claims 1 to 4, characterized in that: It comprises a metal foil material (100) and an electrode material layer (200); The metal foil (100) comprises a through hole (300) penetrating the metal substrate, and the aperture of the through hole (300) is in the range of 0.001 to 100 μm; The electrode material layer (200) is formed on the surface of the metal foil (100) by means of slurry coating.

6. The electrode plate according to claim 5, characterized in that: The metal foil material (100) comprises a plurality of stacked metal sub-layers (110), and each of the metal sub-layers (110) comprises through holes (300) arranged in a regular and orderly manner.

7. The electrode plate according to claim 6, characterized in that: The centers of the through holes (300) of adjacent metal sub-layers (110) do not overlap, and after being stacked, there is a gap that penetrates the metal foil material (100).

8. The electrode plate according to any one of claims 5 to 7, characterized in that: The through hole (300) is perpendicular to the winding direction of the pole piece.

9. The electrode plate according to claim 5, characterized in that: The metal foil material (100) is selected from one of pure aluminum foil, pure copper foil, composite aluminum foil or composite copper foil.

10. A battery, characterized in that: The positive electrode and / or negative electrode thereof adopts the electrode sheet as described in any one of claims 5 to 9.

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