An electrode forming apparatus, process, and pressure roller for electrode forming.

Abstract

This invention provides an electrode forming apparatus, a process, and a pressure roller for electrode forming. The electrode forming apparatus includes a first pressure roller and a second pressure roller. The inner cavity of the first pressure roller is provided with an air outlet structure connected to an air supply device. The surface of the first pressure roller is provided with a circumferentially distributed roller exhaust structure. The second pressure roller is arranged opposite to the first pressure roller, and a gap is provided between the first and second pressure rollers to roll the electrode material into an electrode film. During use, when the electrode material enters the gap between the first and second pressure rollers, the gas inside the roller cavity is discharged outward through the circumferentially distributed roller exhaust structure on the surface of the first pressure roller during the rolling process. This applies an outward pushing force relative to the surface of the first pressure roller to the electrode material, preventing electrode material particles from remaining embedded on the surface of the first pressure roller after film formation, thereby improving product yield.

Description

Technical Field

[0001] This invention relates to electrode preparation processes, and more particularly to an electrode forming apparatus, process, and pressure roller for electrode forming. Background Technology

[0002] Currently, in the electrode processing, the electrode material needs to be rolled into an electrode film first, and then the electrode film is rolled and laminated with a substrate to form an electrode sheet. Before rolling, the electrode material is usually granular. To ensure good rolling effect during the rolling process, the electrode material particles are generally required to embed to a certain depth into the surface of the roller. This requires the hardness of the particles to be greater than the surface hardness of the roller. Electrode material embedded in the roller surface easily sticks to the roller surface after rolling, leading to not only wasted electrode material but also affecting the yield of the produced electrode sheets. Summary of the Invention

[0003] Therefore, there is a need to provide an electrode forming device, process, and pressure roller for electrode forming, in order to solve the problem that electrode material is easily embedded on the surface of the pressure roller during the formation of electrode film, resulting in slurry waste and affecting product yield.

[0004] To achieve the above objectives, in a first aspect, this application provides an electrode forming apparatus, including a first pressure roller and a second pressure roller. The inner cavity of the first pressure roller is provided with an air outlet structure, which is connected to an air supply device. The roller surface of the first pressure roller is provided with circumferentially distributed roller exhaust structures. The second pressure roller is disposed opposite to the first pressure roller, and a gap is provided between the first pressure roller and the second pressure roller to roll the electrode material into an electrode film.

[0005] In the above scheme, by providing an air outlet structure in the inner cavity of the first pressure roller, which is connected to an air supply device, and by providing a circumferentially distributed roller exhaust structure on the surface of the first pressure roller, during use, when the electrode material enters the gap between the first and second pressure rollers, during the rolling process of the first and second pressure rollers on the electrode material, the air outlet structure in the inner cavity of the first pressure roller exhausts air outward through the circumferentially distributed roller exhaust structure on the surface of the first pressure roller, thereby applying an outward pushing force relative to the surface of the first pressure roller to the electrode material, preventing the electrode material particles from remaining embedded on the surface of the first pressure roller after film formation, thereby improving the product yield.

[0006] In one embodiment of this application, the gas outlet structure is a dispersed gas outlet structure. The gas supplied by the gas supply device first passes through the dispersed gas outlet structure and then through the circumferentially distributed roller exhaust structure before being discharged from the roller surface of the first pressure roller. Because the gas outlet structure is a dispersed gas outlet structure, the gas can be discharged more evenly from the roller surface of the first pressure roller through the circumferentially distributed roller exhaust structure. This prevents the thrust generated by the discharged gas from being larger in some areas and smaller in others on the roller surface of the first pressure roller, resulting in a relatively uniform thickness of the generated electrode film at various locations, effectively improving the product yield.

[0007] In one embodiment of this application, the dispersed gas outlet structure includes a first roller shaft, which is hollow and passes through the inner cavity of the first pressure roller. The surface of the first roller shaft is provided with circumferentially distributed roller shaft exhaust structures, and the inner cavity of the first roller shaft is provided with an air supply port connected to an air supply device. Thus, during the rotation of the driven roller shaft, the air supply device simultaneously supplies air to the air supply port in the inner cavity of the first roller shaft. The gas passes sequentially through the circumferentially distributed roller shaft exhaust structures on the surface of the first roller shaft and the circumferentially distributed roller cylinder exhaust structures on the surface of the first pressure roller before exiting the surface of the first pressure roller. Since both the roller shaft exhaust structures and the roller cylinder exhaust structures are circumferentially distributed on the roller shaft and roller cylinder surfaces, it ensures that the gas is uniformly discharged from both surfaces. Therefore, the thrust exerted on the electrode material by the surface gas discharged from the roller shaft during the rotation of the roller shaft is also relatively uniform, thereby ensuring a uniform electrode film thickness and improving product yield.

[0008] In one embodiment of this application, the total open area of ​​the venting holes on the roller venting structure is larger than the total open area of ​​the venting holes on the roller venting structure. Thus, the gas exits through the roller venting structure at a faster rate than exits through the roller venting structure. Consequently, the pressure in the region between the roller shaft and the roller in the first roller is greater than the external standard atmospheric pressure. Gas that has exited through the roller venting structure but has not yet exited through it exerts pressure on the contact surface between the roller shaft and the roller inside the roller, resulting in a tighter contact between the roller shaft and the roller, thus improving the airtightness between them.

[0009] In one embodiment of this application, the ratio of the total open area of ​​the exhaust holes on the roller exhaust structure to the total open area of ​​the exhaust holes on the roller exhaust structure is 1.05-1.5:1. This ensures that while the exhaust velocity of the roller exhaust structure is greater than that of the roller exhaust structure, the pressure difference between the inside of the roller (the area between the outer surface of the roller and the inner surface of the roller) and the outside environment remains within a predetermined range.

[0010] In one embodiment of this application, the first pressure roller's cylinder and the first roller shaft are airtightly sealed by an elastic seal. The elastic seal can be disposed in the connection area between the first pressure roller's cylinder and the first roller shaft. When the internal pressure of the cylinder is greater than the external air pressure, the elastic seal expands under force, thereby making the connection between the first pressure roller's cylinder and the first roller shaft tighter and effectively improving the airtightness between the inner roller shaft and the outer roller during the use of the first pressure roller.

[0011] In one embodiment of this application, a third pressure roller and a substrate conveying assembly are also included. The third pressure roller is disposed opposite to the second pressure roller, and a gap is provided between the second and third pressure rollers to roll-press the electrode film and the substrate into an electrode sheet. The substrate conveying assembly is used to convey the substrate into the gap between the second and third pressure rollers. In this way, while the first and second pressure rollers are rolling the electrode material into an electrode film, the substrate conveying assembly simultaneously conveys the substrate into the gap between the second and third pressure rollers. The electrode film adheres to the surface of the substrate during the rolling process, thereby obtaining the desired electrode sheet.

[0012] In one embodiment of this application, the first and second pressure rollers are arranged horizontally side by side, and the third pressure roller is arranged horizontally side by side or vertically arranged with the second pressure rollers. When the third pressure roller is arranged horizontally side by side, the electrode material is rolled into an electrode film through the gap between the first and second pressure rollers, and then moved to the gap between the second and third pressure rollers by the transmission action of the second pressure roller. During this process, the substrate conveying component simultaneously conveys the substrate to the gap between the second and third pressure rollers, so the generated electrode film adheres to the surface of the substrate, thereby obtaining a composite electrode sheet. The composite electrode sheet is output by the transmission action of the third pressure roller. When the third and second pressure rollers are arranged vertically, the way the electrode material and substrate obtain the composite electrode sheet is similar to that when the third and second pressure rollers are arranged horizontally side by side, the electrode film rolled between the first and second pressure rollers can be more accurately transferred to the gap between the third and second pressure rollers due to gravity, thereby effectively improving the yield of the obtained electrode sheet.

[0013] In one embodiment of this application, the electrode forming apparatus further includes two pressure roller groups and a substrate conveying assembly. Each pressure roller group includes one first pressure roller and one second pressure roller. The two pressure roller groups are arranged in a mirror-symmetrical manner, with the two second pressure rollers in the two pressure roller groups centrally opposite each other. A gap is provided between the two second pressure rollers to roll and composite the two electrode films with the centrally located substrate into an electrode. The substrate conveying assembly is used to convey the substrate into the gap between the two second pressure rollers. In this way, the substrate required to form the electrode is conveyed from the gap between the second pressure rollers in two adjacent pressure roller groups. The electrode material input into the gap between the first and second pressure rollers of one pressure roller group is first rolled into an electrode film through the gap between the two, and then transferred by the driving action of the second pressure roller in the pressure roller group to the gap between the second and third pressure rollers, and then attached to one side of the substrate. The electrode material input into the gap between the first and second pressure rollers of the other pressure roller group is first rolled into an electrode film through the gap between the two, and then transferred by the driving action of the second pressure roller in the pressure roller group to the gap between the second and third pressure rollers, and then attached to the other side of the substrate. The above method can produce electrode sheets with electrode films attached to both sides, thus meeting different production needs.

[0014] In one embodiment of this application, the two first pressure rollers and two second pressure rollers in the two pressure roller groups are arranged horizontally side by side. This can effectively improve space utilization and also allow the electrode film obtained by rolling through the gap between the first and second pressure rollers in the pressure roller group to be better transferred to one side of the substrate for further composite with the substrate to form an electrode sheet.

[0015] As one embodiment of this application, the electrode forming apparatus further includes a feeding assembly for supplying electrode material into the gap between the first and second pressure rollers. By providing the feeding assembly, it can be ensured that the electrode material being delivered to the gap between the first and second pressure rollers is uninterrupted during the electrode film formation process, thus avoiding the situation where some areas of the electrode surface are without electrode film due to insufficient electrode material, thereby improving product yield.

[0016] In a second aspect, this application provides a pressure roller for forming electrode sheets, which is the first pressure roller involved in the above embodiments.

[0017] In terms of third parties, this application also provides an electrode forming process, including the following steps: feeding electrode material into the gap between a first pressure roller and a second pressure roller, the first pressure roller venting air outward through a roller venting structure circumferentially arranged on its roller surface; the first pressure roller and the second pressure roller rotating in opposite directions roll the electrode material in the gap between them into an electrode film.

[0018] The above solution sets a roller exhaust structure on the roller surface of the first pressure roller. After the electrode material is fed into the gap between the first pressure roller and the second pressure roller, the roller exhaust structure exhausts the air outward to apply an outward pushing force to the electrode material. This prevents the electrode material particles from adhering to the surface of the first pressure roller during the rolling process, thereby effectively avoiding the waste of electrode material. At the same time, it can ensure that the overall thickness of the obtained electrode film is relatively uniform, thus improving the product yield.

[0019] In one embodiment of this application, the first pressure roller venting gas outward through the roller venting structure circumferentially arranged on its roller surface specifically includes: dispersing gas into the inner cavity of the first pressure roller; and venting the gas from the inner cavity of the first pressure roller outward through the roller venting structure circumferentially arranged on the roller surface of the first pressure roller. This ensures that the gas can be uniformly and synchronously discharged from the roller venting structure circumferentially arranged on the roller surface of the first pressure roller, ensuring uniform stress on all positions of the electrode material during the roll forming of the electrode film, and improving product yield.

[0020] As one embodiment of this application, dispersing air supply to the inner cavity of the first pressure roller specifically includes: the first pressure roller dispersing air supply to its inner cavity through a roller shaft exhaust structure disposed on the surface of a hollow first roller shaft that passes through its inner cavity. Thus, when the roller shaft drives the roller to rotate, the roller shaft exhaust structure on the roller shaft surface disperses air supply to its inner cavity, and the gas is then exhausted outward through the circumferentially disposed roller shaft exhaust structure on the roller surface. Because the roller shaft exhaust structure uses dispersed air supply and is circumferentially distributed on the roller surface, air is uniformly discharged from all positions during the roller's rotation, ensuring uniform stress on all positions of the electrode material during the roll forming of the electrode film, thereby improving product yield.

[0021] In one embodiment of this application, the electrode forming process further includes: after the electrode material is rolled into an electrode film, the electrode film is peeled off from the roller surface of the first pressure roller and attached to the roller surface of the second pressure roller. The electrode film attached to the roller surface of the second pressure roller can be laminated with a corresponding substrate through the transmission of the second pressure roller to obtain an electrode sheet, thereby improving product production efficiency.

[0022] In one embodiment of this application, after the electrode material is rolled into an electrode film, the method further includes the following steps: the second pressure roller rotates to feed the electrode film attached to the roller surface of the second pressure roller, together with the provided substrate, into the gap between the second pressure roller and the third pressure roller; the second and third pressure rollers, rotating in opposite directions, roll-press the electrode film and the substrate in the gap between them into an electrode sheet. By setting the third pressure roller, and simultaneously conveying the substrate to the second and third pressure rollers while rolling the electrode film in the gap between the first and second pressure rollers, when the electrode film is transferred to the gap between the second and third pressure rollers, the second and third pressure rollers can further roll-press the electrode film and the substrate into an electrode sheet.

[0023] In one embodiment of this application, electrode material is rolled into an electrode film using two sets of pressure rollers. Each pressure roller set includes one first pressure roller and one second pressure roller, arranged mirror images of each other, with the two second pressure rollers in each set facing each other. After the electrode material is rolled into an electrode film, the method further includes: rotating the second pressure rollers to feed the electrode film attached to the roller surfaces of the two second pressure rollers, along with a provided substrate, into the gap between the two second pressure rollers; and using the two opposing second pressure rollers to roll-press the electrode film and substrate in the gap between them into an electrode sheet. This method allows for the rolling of an electrode sheet with electrode films on both sides.

[0024] As one embodiment of this application, the method further includes the steps of: simultaneously feeding the electrode material into the gap between the first and second pressure rollers, and feeding the provided substrate into the gap between the first and second pressure rollers together, with the substrate located between the electrode material and the rollers of the second pressure roller; and using the opposing first and second pressure rollers to roll the electrode material in the gap between them into an electrode film, while simultaneously rolling the electrode film and the substrate together to form an electrode sheet. In this way, during the process of rolling the electrode material into an electrode film, since the substrate is synchronously input into the gap between the first and second pressure rollers, the first and second pressure rollers simultaneously roll and combine the electrode film and the substrate together to form an electrode sheet while rolling the electrode material in the gap between them into an electrode film, thereby achieving the desired electrode sheet by simply setting the first and second pressure rollers.

[0025] In one embodiment of this application, the volume water content of the electrode material is ≤20%. Currently, to prevent the electrode material from easily embedding into the surface of the first pressure roller during the rolling process, the volume water content of the electrode material is usually required to be greater than 20%. This limits the proportion of solid components in the electrode material, affecting the quality of the electrode film formed by rolling. The roller venting structure on the surface of the first pressure roller designed in this application effectively overcomes the problem of the electrode material easily embedding into the roller surface during the rolling process. Therefore, in actual film formation, the volume water content of the electrode material can be set to less than or equal to 20%, thereby effectively ensuring the quality of the formed electrode film. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the electrode forming apparatus according to a specific embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the assembled structure of the first pressure roller according to a specific embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the disassembled and assembled structure of the first pressure roller according to a specific embodiment of this application;

[0029] Figure 4This is a front view cross-sectional view of the first pressure roller according to a specific embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the first roller shaft according to a specific embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the roller of the first pressure roller according to a specific embodiment of this application;

[0032] Figure 7 This is a side view of the first pressure roller according to a specific embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the electrode forming apparatus according to another specific embodiment of this application;

[0034] Figure 9 This is a schematic diagram of the electrode forming apparatus according to another specific embodiment of this application;

[0035] Figure 10 This is a schematic diagram of the electrode forming apparatus according to another specific embodiment of this application;

[0036] Figure 11 This is a flowchart of the electrode forming process according to a specific embodiment of this application;

[0037] Figure 12 This is a flowchart of an electrode forming process according to another specific embodiment of this application;

[0038] Figure 13 This is a flowchart of an electrode forming process according to another specific embodiment of this application;

[0039] Figure 14 This is a flowchart of an electrode forming process according to another specific embodiment of this application;

[0040] Figure 15 This is a flowchart of an electrode forming process according to another specific embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. First pressure roller;

[0043] 11. The roller of the first pressure roller;

[0044] 111. Exhaust structure; 112. Roller exhaust structure;

[0045] 12. First roller;

[0046] 121. Roller exhaust structure; 122. Air supply port;

[0047] 13. Bearings;

[0048] 14. Bearing seal disc;

[0049] 2. Second pressure roller;

[0050] 3. Third pressure roller;

[0051] 4. Electrode materials;

[0052] 41. Electrode film;

[0053] 5. Substrate;

[0054] 6. Electrode film;

[0055] 7. Feeding assembly;

[0056] 8. Pressure roller assembly. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0063] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] Currently, the preparation of electrode sheets, in addition to rolling the substrate, also requires rolling the electrode material into an electrode film and then laminating it with the substrate to obtain the desired electrode sheet. Electrode materials are usually granular, and during the rolling process, they are easily embedded into the surface of the rollers. This not only wastes raw materials but also results in uneven thickness of the rolled electrode film, affecting product yield.

[0066] To address the problem of coating particles easily embedding into the surface of the rollers during the roll forming process, a coating manufacturing apparatus is proposed. The apparatus includes one or two first rollers for rolling a mixed coating material; and a second roller arranged opposite to the first rollers, with the mixed coating material sandwiched between the first and second rollers. At least one of the first rollers has a surface layer with a hardness lower than that of the coating particles. The mixed coating material is supplied to the gap between the two first rollers or the gap between the first and second rollers, and the mixed coating material is rolled to manufacture a coating. This solution maintains high productivity by providing a surface layer with optimized hardness on the surface of the rollers used to supply the mixed coating material. Even when using wet coatings that do not require a drying process, it can produce high-quality coatings with uniform film thickness.

[0067] However, the inventors have noted that the coating manufacturing apparatus has at least the following disadvantages: (1) It requires at least one of the first rollers to have a surface layer with a lower hardness than the coating particles, which requires increasing the particle hardness of the electrode material 4 or requiring the first roller to be a soft roller, thus limiting the processing scenarios of the electrode film 41; (2) When the electrode material 4 is rolled into a film, it is usually required that the electrode material 4 particles be embedded into the surface of the first roller to a depth of 5%-50% of the particle size itself. After the film is rolled, the particles are easy to remain on the surface of the first roller, resulting in the waste of the electrode material 4; (3) Since the electrode material 4 is required to reach a predetermined value, in order to ensure that the harder electrode material 4 can eventually form the electrode film 41, it is usually required that the volume water content of the electrode material 4 is greater than 20%. The electrode material 4 with a low volume water content cannot be used in the coating manufacturing apparatus of the above scheme.

[0068] To address the technical challenges of current coating manufacturing equipment that requires specific hardness of coating particles and where these particles adhere to the coating rollers during the roll forming process, such as... Figure 1 As shown, in a first aspect, this application provides an electrode sheet 6 forming apparatus, including a first pressure roller 1 and a second pressure roller 2. The inner cavity of the roller 11 of the first pressure roller is provided with an air outlet structure 111, which is connected to an air supply device. The surface of the roller 11 of the first pressure roller is provided with circumferentially distributed roller exhaust structures 112. The second pressure roller 2 is disposed opposite to the first pressure roller 1, and a gap is provided between the first pressure roller 1 and the second pressure roller 2 to roll the electrode material 4 into an electrode film 41.

[0069] The air outlet structure 111 can be directly connected to the air supply device, or it can be connected to the air supply device through an air delivery pipe. The air outlet structure 111 can be an air outlet hole located inside the roller cavity, or it can be an air outlet hole located on the side wall of the roller. When the air outlet structure 111 is an air outlet hole located on the side wall of the roller, the gas supplied by the air supply device first enters the inner cavity of the roller through the air outlet hole on the side wall of the roller, and then is discharged through the roller exhaust structure 112 on the surface of the roller. The air supply device can be a gas tank containing gas, or it can be a gas pump. The gas pump draws in outside air and delivers it to the air outlet structure 111 to realize the function of supplying air to the inner cavity of the roller.

[0070] The roller exhaust structure 112 can be an array of exhaust holes circumferentially distributed on the surface of the first pressure roller 11, or it can be an exhaust gap circumferentially distributed on the surface of the first pressure roller 11. The difference between the exhaust gap and the exhaust hole array is that the multiple exhaust holes in the same exhaust hole array are spaced apart, while the exhaust gap refers to a row of gaps arranged continuously. Preferably, adjacent exhaust hole arrays or exhaust gaps are arranged in parallel, and the distance between each adjacent exhaust hole array or exhaust gap is equal. This makes the gas discharged through the roller exhaust structure 112 more uniform during the rolling process of the first pressure roller 1.

[0071] The electrode forming apparatus of this application has an exhaust structure 111 in the inner cavity of the first pressure roller 11, which is connected to an air supply device, and a circumferentially distributed roller exhaust structure 112 on the surface of the first pressure roller 11. During use, when the electrode material 4 enters the gap between the first pressure roller 1 and the second pressure roller 2, the exhaust structure 111 in the inner cavity of the first pressure roller 11 exhausts air outward through the circumferentially distributed roller exhaust structure 112 on the surface of the first pressure roller 11. This applies an outward pushing force to the electrode material 4 relative to the surface of the first pressure roller 11, preventing the electrode material 4 particles from being embedded on the surface of the first pressure roller 11, thereby improving the product yield.

[0072] like Figure 1 As shown, after the first pressure roller 1 and the second pressure roller 2 roll the electrode material 4 into an electrode film 41, the substrate 5 can be simultaneously conveyed into the gap between the electrode film 41 and the second pressure roller 2, so that the substrate 5 and the electrode film 41 can be combined into an electrode sheet 6 again by the rolling action of the first pressure roller 1 and the second pressure roller 2. The substrate 5 is preferably made of a metal material with good ductility.

[0073] In one embodiment of this application, the gas outlet structure 111 is a dispersed gas outlet structure 111. The gas supplied by the gas supply device first passes through the dispersed gas outlet structure 111, and then passes through the circumferentially distributed roller exhaust structure 112 before being discharged from the surface of the roller 11 of the first pressure roller. Since the gas outlet structure 111 is a dispersed gas outlet structure 111, the gas can be discharged more evenly from the surface of the roller 11 of the first pressure roller after passing through the circumferentially distributed roller exhaust structure 112. This prevents the thrust generated by the discharged gas from being larger in some areas and smaller in others on the surface of the roller 11 of the first pressure roller, resulting in a relatively uniform thickness of the generated electrode film 41 at various locations, effectively improving the product yield.

[0074] As one embodiment of this application, such as Figures 3-7 As shown, the dispersed air outlet structure 111 includes a first roller shaft 12, which is a hollow structure and passes through the inner cavity of the roller 11 of the first pressure roller. The surface of the first roller shaft 12 is provided with circumferentially distributed roller shaft exhaust structures 121, and the inner cavity of the first roller shaft 12 is provided with an air supply port 122, which is connected to an air supply device. Thus, during the rotation of the driven roller shaft, the air supply device simultaneously supplies air to the air supply port 122 in the inner cavity of the first roller shaft 12. The gas passes sequentially through the circumferentially distributed roller shaft exhaust structures 121 on the surface of the first roller shaft 12 and the circumferentially distributed roller exhaust structures 112 on the surface of the roller 11 of the first pressure roller before being discharged from the surface of the roller 11 of the first pressure roller. Since the roller exhaust structure 121 is circumferentially distributed on the roller surface and the roller exhaust structure 112 is circumferentially distributed on the roller surface, it can be ensured that the gas is uniformly discharged on the roller surface and the roller surface. In this way, the thrust exerted by the surface gas of the roller discharged on the electrode material 4 during the rotation of the roller is also relatively uniform, thereby ensuring that the thickness deviation of the formed electrode film 41 is small and improving the yield of the product.

[0075] The roller exhaust structure 121 can be an array of exhaust holes circumferentially distributed on the surface of the first pressure roller 11, or an exhaust gap circumferentially distributed on the surface of the first roller shaft 12. The difference between the exhaust gap and the exhaust hole array is that the multiple exhaust holes in the same exhaust hole array are spaced apart, while the exhaust gap refers to a row of gaps arranged continuously. Preferably, adjacent exhaust hole arrays or exhaust gaps are arranged in parallel, and the distance between each adjacent exhaust hole array or exhaust gap is equal. This ensures that the gas discharged into the inner cavity of the first pressure roller 11 through the roller exhaust structure 121 is uniformly discharged during the driving rotation of the first roller shaft 12. Since the gas in the inner cavity of the first pressure roller 11 is discharged through the roller exhaust structure 112 circumferentially distributed on the surface of the first pressure roller 11, the gas is also uniformly discharged from the surface of the first pressure roller 11. This allows the electrode material 4 to be subjected to more uniform stress during the roll forming of the electrode film 41, ensuring that the thickness deviation of the formed electrode film 41 is small and improving the product yield.

[0076] like Figures 2-4 As shown, the first pressure roller 1 includes a roller, a first roller shaft 12, a bearing sealing disc 14, and bearings 13. The roller 11 of the first pressure roller is sleeved on the first roller shaft 12. The roller 11 of the first pressure roller is connected to both ends of the first roller shaft 12 via bearings 13. When the first roller shaft 12 rotates under the action of the drive mechanism, the bearings 13 at both ends of the first roller shaft 12 rotate synchronously, thereby driving the roller 11 of the first pressure roller. To prevent the bearings 13 from sliding relative to each other inside the roller during rotation, bearing sealing discs 14 for placing the bearings 13 are also sleeved at both ends of the first roller shaft 12.

[0077] like Figure 5 The diagram shown is a schematic representation of a first roller 12 according to a specific embodiment of this application. The first roller 12 is provided with roller venting structures 121 arranged circumferentially on the surface of the roller, for example... Figure 5 The venting structure 121 of the middle roller shaft consists of multiple arrays of venting holes arranged side by side. Each array of venting holes includes multiple venting holes arranged along the axial direction of the roller shaft. In other embodiments, the array of venting holes may also be arranged on the surface of the roller shaft along the rotation direction of the roller shaft, and adjacent arrays of venting holes are preferably arranged parallel to each other at equal intervals. The roller shaft venting structure 121 may also be an array of venting gaps, which includes multiple venting gaps arranged side by side. The venting gaps may be arranged along the rotation direction of the first roller shaft 12 or along the axial direction of the first roller shaft 12, and adjacent venting gaps are preferably arranged parallel to each other at equal intervals.

[0078] The first roller 12 is also provided with an air supply port 122 for connecting to an air supply device to receive gas supplied by the air supply device, for example... Figure 5The air supply port 122 is located on the side wall of the first roller 12. The gas supplied by the air supply device first enters the hollow inner cavity of the first roller 12 through the air supply port 122, and then exits into the inner cavity of the roller through the roller exhaust structure 121 provided on the surface of the first roller 12. In some embodiments, there may be multiple air supply ports 122. For example, one air supply port 122 may be provided on each of the two sides of the first roller 12, and the air supply device may simultaneously supply gas to the two air supply ports 122 when supplying gas.

[0079] like Figure 6 The diagram shown is a schematic representation of the roller 11 of the first pressure roller according to a specific embodiment of this application. A circumferentially arranged roller venting structure 112 is provided on the surface of the roller 11 of the first pressure roller, for example... Figure 6 The middle roller exhaust structure 112 is a multi-group array of exhaust through holes arranged side by side. Each exhaust through hole array includes multiple exhaust through holes arranged along the roller axial direction. In other embodiments, the exhaust through hole array can also be arranged on the surface of the roller along the roller rotation direction, and adjacent exhaust through hole arrays are preferably arranged equidistantly and parallelly. The roller exhaust structure 112 can also be an exhaust gap array, including multiple exhaust gaps arranged side by side. The exhaust gaps can be arranged along the rotation direction of the first roller or along the axial direction of the first roller, and adjacent exhaust gaps are preferably arranged equidistantly and parallelly. The side of the assembled first roller shaft 12 is shown below. Figure 7 As shown.

[0080] In one embodiment of this application, the total open area of ​​the exhaust holes on the roller exhaust structure 121 is greater than the total open area of ​​the exhaust holes on the roller exhaust structure 112. Thus, the gas exits through the roller exhaust structure 121 at a faster rate than it exits through the roller exhaust structure 112. Consequently, the pressure in the region between the roller shaft and the roller in the first roller is greater than the external standard atmospheric pressure. The gas exiting through the roller exhaust structure 121 but not yet through the roller exhaust structure 112 exerts pressure on the contact surface between the roller shaft and the roller inside the roller, resulting in a tighter contact between the roller shaft and the roller, thus improving the airtightness between them.

[0081] In one embodiment of this application, the ratio of the total open area of ​​the exhaust holes on the roller exhaust structure 121 to the total open area of ​​the exhaust holes on the roller exhaust structure 112 is 1.05-1.5:1. This ensures that while the exhaust velocity of the roller exhaust structure 121 is greater than that of the roller exhaust structure 112, the pressure difference between the inside of the roller (the area between the outer surface of the roller and the inner surface of the roller) and the outside environment remains within a predetermined range.

[0082] In one embodiment of this application, the first pressure roller's cylinder 11 and the first roller shaft 12 are airtightly sealed by an elastic seal. The elastic seal can be located in the connection area between the first pressure roller's cylinder 11 and the first roller shaft 12. When the internal pressure of the roller is greater than the external air pressure, the elastic seal expands under force, thereby making the connection between the first pressure roller's cylinder 11 and the first roller shaft 12 tighter, effectively improving the airtightness between the inner roller shaft and the outer roller during use. The elastic seal can be a rubber ring, silicone ring, etc.

[0083] like Figure 8 and Figure 9 As shown, in one embodiment of this application, a third pressure roller 3 and a substrate 5 conveying assembly are also included. The third pressure roller 3 is disposed opposite to the second pressure roller 2, and a gap is provided between the second pressure roller 2 and the third pressure roller 3 to roll and bond the electrode film 41 and the substrate 5 into an electrode sheet 6. The substrate 5 conveying assembly is used to convey the substrate 5 into the gap between the second pressure roller 2 and the third pressure roller 3. In this way, when the first pressure roller 1 and the second pressure roller 2 roll the electrode material 4 into the electrode film 41, the substrate 5 conveying assembly simultaneously conveys the substrate 5 into the gap between the second pressure roller 2 and the third pressure roller 3. The electrode film 41 will adhere to the surface of the substrate 5 during the rolling process, thereby obtaining the desired electrode sheet 6.

[0084] like Figure 8 and Figure 9 As shown, in one embodiment of this application, the first pressure roller 1 and the second pressure roller 2 are arranged horizontally side by side, and the third pressure roller 3 is arranged horizontally side by side or vertically above the second pressure roller 2. The vertical arrangement of the third pressure roller 3 and the second pressure roller 2 can include both being arranged vertically above and below each other, or they can be arranged at an angle above and below each other.

[0085] like Figure 8 As shown, when the third pressure roller 3 and the second pressure roller 2 are arranged horizontally side by side, the electrode material is rolled into an electrode film 41 through the gap between the first pressure roller 1 and the second pressure roller 2, and then moved to the gap between the second pressure roller 2 and the third pressure roller 3 by the transmission action of the second pressure roller 2. During this process, the substrate 5 conveying assembly will simultaneously convey the substrate 5 to the gap between the second pressure roller 2 and the third pressure roller 3, so the generated electrode film 41 will adhere to the surface of the substrate 5, thereby obtaining the composite electrode sheet 6. The composite electrode sheet 6 is output by the transmission action of the third pressure roller 3.

[0086] like Figure 9As shown, when the third pressure roller 3 and the second pressure roller 2 are arranged vertically, the way in which the electrode material 4 and the substrate 5 are used to obtain the composite electrode sheet 6 is similar to that when the third pressure roller 3 and the second pressure roller 2 are arranged horizontally side by side. The difference is that when the third pressure roller 3 and the second pressure roller 2 are arranged horizontally vertically, compared with the way they are arranged side by side, the electrode film 41 obtained by rolling between the first pressure roller 1 and the second pressure roller 2 can be more accurately transferred to the gap between the third pressure roller 3 and the second pressure roller 2 due to gravity, thereby effectively improving the yield of the obtained electrode sheet 6.

[0087] like Figures 8-9 As shown in the figure, in one embodiment of this application, the electrode forming apparatus further includes a feeding assembly 7, which is used to supply electrode material 4 into the gap between the first pressure roller 1 and the second pressure roller 2. By providing the feeding assembly 7, it can be ensured that the electrode material 4 is continuously supplied to the gap between the first pressure roller 1 and the second pressure roller 2 during the generation of the electrode film 41, thus avoiding the situation where some areas on the surface of the obtained electrode sheet 6 are not qualified due to insufficient electrode material 4, thereby improving the product yield.

[0088] like Figure 10 As shown, in one embodiment of this application, the electrode forming apparatus further includes two pressure roller groups 8 and a substrate 5 conveying assembly. Each pressure roller group 8 includes one first pressure roller 1 and one second pressure roller 2. The two pressure roller groups 8 are arranged in a mirror symmetrical manner. The two second pressure rollers 2 in the two pressure roller groups 8 are arranged in the center opposite each other. A gap is provided between the two second pressure rollers 2 to roll and composite the two electrode films 41 with the centrally located substrate 5 to form an electrode 6. The substrate 5 conveying assembly is used to convey the substrate 5 into the gap between the two second pressure rollers 2. In this way, the substrate 5 required to generate the electrode 6 is conveyed through the gap between the second pressure rollers 2 of two adjacent pressure roller groups 8. The electrode material 4 input into the gap between the first pressure roller 1 and the second pressure roller 2 of one pressure roller group 8 is first pressed into an electrode film 41 through the gap between them, and then transferred by the driving action of the second pressure roller 2 in the pressure roller group 8 to the gap between the second pressure roller 2 and the third pressure roller 3, and then attached to one side of the substrate 5. The electrode material 4 input into the gap between the first pressure roller 1 and the second pressure roller 2 of the other pressure roller group 8 is first pressed into an electrode film 41 through the gap between them, and then transferred by the driving action of the second pressure roller 2 in the pressure roller group 8 to the gap between the second pressure roller 2 and the third pressure roller 3, and then attached to the other side of the substrate 5. Through the above scheme, an electrode 6 with electrode films 41 attached to both sides can be obtained, thereby meeting different production needs.

[0089] like Figure 10As shown, in one embodiment of this application, the two first pressure rollers 1 and two second pressure rollers 2 in the two pressure roller groups 8 are arranged horizontally side by side. This can effectively improve space utilization and also allow the electrode film 41 obtained by rolling through the gap between the first pressure rollers 1 and the second pressure rollers 2 in the pressure roller group 8 to be better transferred to one side of the substrate 5 for further composite with the substrate 5 to form an electrode sheet 6.

[0090] In a second aspect, this application provides a pressure roller for electrode forming, which is the first pressure roller 1 described in the above embodiments. The structure of the first pressure roller 1 is as described above. Figures 2-7 The description will not be elaborated here.

[0091] In the third aspect, such as Figure 11 As shown, this application also provides an electrode forming process, including the following steps:

[0092] First, in step S111, the electrode material 4 is fed into the gap between the first pressure roller 1 and the second pressure roller 2. The first pressure roller 1 exhausts air outward through the roller exhaust structure 112 circumferentially arranged on its roller surface.

[0093] Then, in step S112, the first pressure roller 1 and the second pressure roller 2 rotate in opposite directions to roll the electrode material 4 in the gap between them into an electrode film 41.

[0094] The above scheme provides a roller exhaust structure 112 on the surface of the roller 11 of the first pressure roller. After the electrode material 4 is fed into the gap between the first pressure roller 1 and the second pressure roller 2, the roller exhaust structure 112 exhausts air outward to apply an outward pushing force to the electrode material 4. This prevents the particles of the electrode material 4 from adhering to the surface of the first pressure roller 1 during the rolling process, thereby effectively avoiding the waste of the electrode material 4. At the same time, it can ensure that the overall thickness of the obtained electrode film 41 is relatively uniform, thus improving the product yield.

[0095] As one embodiment of this application, such as Figure 12 As shown, the first pressure roller 1 exhausts gas outward through the roller exhaust structure 112 circumferentially arranged on its roller surface. Specifically, this includes: firstly, in step S112, dispersing gas into the inner cavity of the first pressure roller 11; then, in step S113, exhausting the gas from the inner cavity of the first pressure roller 11 outward through the roller exhaust structure 112 on the surface of the first pressure roller 11. This ensures that the gas can be uniformly and synchronously discharged from the roller exhaust structure 112 circumferentially arranged on the surface of the first pressure roller 11, ensuring uniform stress on all positions of the electrode material 4 during the roll forming of the electrode film 41, and improving product yield.

[0096] As one embodiment of this application, dispersing air supply to the inner cavity of the first pressure roller 11 specifically includes: the first pressure roller 1 dispersing air supply to its inner cavity through a roller shaft exhaust structure 121 disposed on the surface of a hollow first roller shaft 12 passing through its inner cavity. In this way, when the roller shaft drives the roller to rotate, the roller shaft exhaust structure 121 on the surface of the roller shaft disperses air supply to its inner cavity, and the gas is then exhausted outward through the roller shaft exhaust structure 112 disposed circumferentially on the surface of the roller. Since the roller shaft exhaust structure 121 adopts dispersed air supply and the roller shaft exhaust structure 121 is circumferentially distributed on the surface of the roller, the air is uniformly discharged at all positions during the rotation of the roller, so that the electrode material 4 is subjected to uniform force at all positions during the roll forming of the electrode film 41, thereby improving the product yield.

[0097] As one embodiment of this application, the electrode forming process further includes: after the electrode material 4 is rolled into an electrode film 41, the electrode film 41 is peeled off from the surface of the roller 11 of the first pressure roller and attached to the surface of the roller 2 of the second pressure roller. The electrode film 41 attached to the surface of the roller 2 can be combined with the corresponding substrate 5 through the transmission of the second pressure roller 2 to obtain the electrode 6, thereby improving the product production efficiency.

[0098] As one embodiment of this application, such as Figure 13 As shown, after the electrode material 4 is rolled into an electrode film 41, the process further includes the following steps: First, in step S131, the second roller 2 rotates to feed the electrode film 41 attached to the roller surface of the second roller 2, together with the provided substrate 5, into the gap between the second roller 2 and the third roller 3; then, in step S132, the second roller 2 and the third roller 3 rotate in opposite directions to roll-press the electrode film 41 and the substrate 5 in the gap between them into an electrode sheet 6. By setting the third roller 3, and while rolling the electrode film 41 in the gap between the first roller 1 and the second roller 2, the substrate 5 is simultaneously conveyed to the second roller 2 and the third roller 3. When the electrode film 41 is transferred to the gap between the second roller 2 and the third roller 3, the second roller 2 and the third roller 3 can further roll-press the electrode film 41 and the substrate 5 into an electrode sheet 6.

[0099] In one embodiment of this application, electrode material 4 is pressed into electrode film 41 by two pressure roller groups 8. Each pressure roller group 8 includes one first pressure roller 1 and one second pressure roller 2, and the two pressure roller groups 8 are arranged in a mirror image of each other. The two second pressure rollers 2 in the two pressure roller groups 8 are arranged opposite each other. Figure 14As shown, after the electrode material 4 is rolled into an electrode film 41, the process further includes the following steps: First, in step S141, the second pressure roller 2 rotates to feed the electrode film 41, which is attached to the roller surface of the two second pressure rollers 2, together with the provided substrate 5, into the gap between the two second pressure rollers 2; then, in step S142, the electrode film 41 and the substrate 5 in the gap between the two second pressure rollers 2, which rotate in opposite directions, are rolled together to form an electrode sheet 6. This method allows for the rolling of electrode sheets 6 with electrode films 41 on both sides.

[0100] As one embodiment of this application, such as Figure 15 As shown, the electrode forming process further includes the following steps: First, in step S151, the electrode material 4 is fed into the gap between the first pressure roller 1 and the second pressure roller 2, while the provided substrate 5 is also fed into the gap between the first pressure roller 1 and the second pressure roller 2. The substrate 5 is located between the electrode material 4 and the second pressure roller 2. Then, in step S152, the electrode material 4 in the gap between the first pressure roller 1 and the second pressure roller 2, which rotate in opposite directions, is rolled into an electrode film 41, and the electrode film 41 and the substrate 5 are rolled together to form an electrode sheet 6. In this way, during the process of rolling the electrode material 4 into an electrode film 41 by the first pressure roller 1 and the second pressure roller 2, since the substrate 5 is synchronously input into the gap between them, the first pressure roller 1 and the second pressure roller 2 will simultaneously roll together the electrode film 41 and the substrate 5 to form an electrode sheet 6 while rolling the electrode material 4 in the gap between them into an electrode film 41. Thus, it is possible to obtain the desired electrode sheet 6 by simply setting the first pressure roller 1 and the second pressure roller 2.

[0101] In one embodiment of this application, the volumetric water content of the electrode material 4 is ≤20%. Currently, to prevent the electrode material 4 from easily embedding into the surface of the first pressure roller 1 during the rolling process, the volumetric water content of the electrode material 4 is usually required to be greater than 20%. This results in a limited proportion of solid components in the electrode material 4, affecting the quality of the electrode film 41 formed by rolling. The roller venting structure 112 on the surface of the first pressure roller 11 designed in this application effectively overcomes the problem of the electrode material 4 easily embedding into the roller surface during the rolling process. Therefore, in actual film formation, the volumetric water content of the electrode material 4 can be set to less than or equal to 20%, thereby effectively ensuring the quality of the formed electrode film 41.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pole piece forming device, characterized by, The electrode film forming device comprises: a first compression roller, a roll inner cavity of the first compression roller is provided with an air outlet structure, the air outlet structure is connected with a gas supply device, a roll surface of the first compression roller is provided with a circumferentially distributed roll exhaust structure; a second compression roller, the first compression roller is arranged opposite to the second compression roller, a gap for rolling the electrode material into an electrode film is arranged between the first compression roller and the second compression roller; the air outlet structure is a dispersed air outlet structure; the dispersed air outlet structure comprises: a first roller shaft, which is a hollow structure, is arranged in the roll inner cavity of the first compression roller; a surface of the first roller shaft is provided with a circumferentially distributed roller shaft exhaust structure, and a gas supply port is arranged in the inner cavity of the first roller shaft, and the gas supply port is connected with the gas supply device.

2. The pole piece forming device of claim 1, wherein A total opening area of exhaust holes on the roller shaft exhaust structure is greater than a total opening area of exhaust holes on the roll exhaust structure.

3. The pole piece forming device of claim 2, wherein A ratio of the total opening area of exhaust holes on the roller shaft exhaust structure to the total opening area of exhaust holes on the roll exhaust structure is 1.05-1.5:

1.

4. The pole piece forming apparatus of claim 1, wherein The roll of the first compression roller and the first roller shaft are airtightly sealed by an elastic sealing element.

5. The pole piece forming device of claim 1, wherein Further comprising: a third compression roller, the second compression roller is arranged opposite to the third compression roller, a gap for rolling the electrode film and the base material into a pole piece is arranged between the second compression roller and the third compression roller; a base material conveying assembly for conveying the base material to the gap between the second compression roller and the third compression roller.

6. The pole piece forming device of claim 5, wherein The first compression roller and the second compression roller are arranged horizontally side by side, and the third compression roller is arranged horizontally side by side with the second compression roller or arranged in an up-down arrangement.

7. The pole piece forming device of claim 1, wherein Further comprising: two compression roller groups, each of the compression roller groups comprises one first compression roller and one second compression roller, the two compression roller groups are arranged in mirror symmetry, two second compression rollers in the two compression roller groups are arranged opposite to each other, and a gap for rolling two electrode films and a centrally arranged base material into a pole piece is arranged between the two second compression rollers; a base material conveying assembly for conveying the base material to the gap between the two second compression rollers.

8. The pole piece forming device of claim 7, wherein, The two first compression rollers and the two second compression rollers in the two compression roller groups are arranged horizontally side by side.

9. The pole piece forming apparatus according to any one of claims 1 to 8, characterized by, Further comprising: a feeding assembly for supplying the electrode material to the gap between the first compression roller and the second compression roller.

10. A press roller for forming an electrode sheet, characterized by comprising: The pole piece forming compression roller is the first compression roller of the pole piece forming device according to any one of claims 1 to 4.

11. A pole piece forming process characterized by, The method comprises the following steps: feeding the electrode material into the gap between the first compression roller and the second compression roller, and the first compression roller exhausts air outward through the circumferentially arranged roll exhaust structure on the roll surface thereof; rotating the first compression roller and the second compression roller towards each other to roll the electrode material in the gap between the first compression roller and the second compression roller into an electrode film; the first compression roller exhausts air outward through the circumferentially arranged roll exhaust structure on the roll surface thereof specifically comprises: dispersively supplying air to the roll inner cavity of the first compression roller; exhausting the air in the roll inner cavity of the first compression roller outward through the roll exhaust structure arranged on the roll surface of the first compression roller; dispersively supplying air to the roll inner cavity of the first compression roller specifically comprises: the first compression roller dispersively supplies air to the roll inner cavity thereof through the roller shaft exhaust structure arranged on the surface of the hollow first roller shaft arranged in the roll inner cavity of the first compression roller.

12. The pole piece forming process of claim 11, wherein, Further comprising: After the electrode material is rolled into an electrode film, the electrode film is peeled off from the roller surface of the first compression roller and attached to the roller surface of the second compression roller.

13. The pole piece forming process of claim 12, wherein, After the electrode material is rolled into an electrode film, the process further comprises the steps of: The second compression roller rotates to send the electrode film attached to the roller surface of the second compression roller together with the provided substrate into the gap between the second compression roller and the third compression roller; The second compression roller and the third compression roller rotate in opposite directions to roll the electrode film and the substrate in the gap between the two rollers into an electrode sheet.

14. The electrode sheet forming process according to claim 12, wherein The electrode material is rolled into an electrode film by two compression roller sets, each of which comprises a first compression roller and a second compression roller, and the two compression roller sets are arranged in mirror symmetry, and the two second compression rollers in the two compression roller sets are arranged oppositely; After the electrode material is rolled into an electrode film, the process further comprises the steps of: The second compression roller rotates to send the electrode film attached to the roller surface of the two second compression rollers together with the provided substrate into the gap between the two second compression rollers; The two second compression rollers rotate in opposite directions to roll the electrode film and the substrate in the gap between the two rollers into an electrode sheet.

15. The pole piece forming process of claim 11, wherein, The process further comprises the steps of: The electrode material is sent into the gap between the first compression roller and the second compression roller, and at the same time, the provided substrate is sent into the gap between the first compression roller and the second compression roller, and the substrate is located between the electrode material and the roller of the second compression roller; The first compression roller and the second compression roller rotate in opposite directions to roll the electrode material in the gap between the two rollers into an electrode film, and at the same time, roll the electrode film and the substrate into an electrode sheet.

16. The pole piece forming process of any one of claims 11 to 15, wherein, The volume water content of the electrode material is less than or equal to 20%.

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