A coating roll structure for a battery electrode

Abstract

The application relates to the technical field of printing equipment, in particular to a coating roller structure for a battery electrode, which comprises a hollow roller, a plug and a bowl body; an inner cavity is formed through the roller along the length direction of the roller; the plug is sealingly arranged at the two ends of the roller, the plug is provided with a mounting hole for inserting a roller shaft, and a hub hole is further formed in the side wall of the mounting hole; the bowl body is sealingly arranged on the side of the plug close to the roller, the bowl body extends into the inner cavity of the roller, the projection of the bowl body covers the mounting hole along the length direction of the roller, and the plug and the bowl body are both made of stainless steel. In the application, the bowl body covers the mounting hole on the inner side of the plug, the communication path between the inner cavity of the roller and the outside is cut off, the risk that cleaning liquid, water vapor or electrode slurry seeps into the inner cavity of the roller through the gap between the roller shaft and the plug is effectively reduced, the rusting risk of the inner side wall of the roller is reduced, and the rustproof performance of the coating roller is improved.

Description

Technical Field

[0001] This application relates to the field of printing equipment technology, and in particular to a coating roller structure for battery electrodes. Background Technology

[0002] In the lithium battery production process, coating rollers are used to uniformly coat the electrode slurry onto the surface of copper / aluminum foil.

[0003] Electrode slurries are typically mixtures of active materials (such as lithium cobalt oxide, lithium iron phosphate, and graphite), conductive agents, binders, and organic solvents (such as NMP) or water. They are extremely sensitive to metal ion contamination, especially variable-valence metal ions such as iron (Fe), copper (Cu), and zinc (Zn). In existing technologies, coating rollers have a hollow structure, making the inner cavity prone to corrosion. Metal impurities generated from rust within the roller cavity may mix into the slurry during the coating process, thus affecting the quality of the electrode slurry. Therefore, when coating rollers are used in the coating process of battery electrode slurries, rust prevention treatment of the coating rollers needs to be a primary consideration.

[0004] Currently, coating rollers are typically made of steel plates. If the entire roller were made of stainless steel, it would increase the manufacturing cost. Therefore, how to balance the manufacturing cost and rust prevention requirements of coating rollers is a research and development topic for those skilled in the art. Summary of the Invention

[0005] To improve the rust resistance of coating rollers, this application provides a coating roller structure for battery electrodes.

[0006] This application provides a coating roller structure for battery electrodes, which adopts the following technical solution: A coating roller structure for battery electrodes includes a hollow roller, a plug, and a bowl. Along the length of the roller, an inner cavity is formed through the roller. The plug is sealed and fixed at both ends of the roller, and has mounting holes for inserting a roller shaft. A hub hole is also formed on the sidewall of the mounting hole. The bowl is sealed and fixed at the side of the plug near the roller, extending into the inner cavity of the roller. Along the length of the roller, the projection of the bowl covers the mounting holes. Both the plug and the bowl are made of stainless steel.

[0007] By adopting the above technical solution, the bowl body covers the mounting hole on the inside of the plug, cutting off the possible communication path between the inner cavity of the roller and the outside world; effectively reducing the risk of cleaning liquid, water vapor or electrode slurry seeping into the inner cavity of the roller through the gap between the roller shaft and the plug, thereby reducing the risk of corrosion of the inner wall of the roller, improving the rust prevention performance of the coating roller, and reducing the risk of corrosion inside the coating roller causing adverse effects on the electrode slurry.

[0008] Optionally, the plug includes an insertion part and an abutment part, the insertion part and the abutment part are integrally formed, and the diameter of the abutment part is larger than the diameter of the insertion part; the insertion part is inserted into the inner cavity of the roller, the abutment part abuts against the roller, and the abutment part is sealed and welded to the roller.

[0009] By adopting the above technical solution, the risk of cleaning fluid penetrating into the inner cavity of the roller can be reduced during subsequent cleaning of the coating roller.

[0010] Optionally, the bowl body includes a bottom wall and a side wall formed by extending from the periphery of the bottom wall towards the same side, the bottom wall and the side wall forming a bowl cavity; a control valve is provided at least one end of the bowl body of the roller, the control valve connects the bowl cavity and the inner cavity, and a clearance distance is provided between the control valve and the roller shaft; gas is supplied to the inner cavity through the control valve, so that the gas pressure in the inner cavity is greater than atmospheric pressure.

[0011] By adopting the above technical solution, gas is injected into the inner cavity through the control valve to test the overall sealing performance of the coating roller, thereby further reducing the risk of external cleaning fluid, water vapor or electrode slurry penetrating into the inner cavity of the roller and improving the rust prevention performance of the coating roller.

[0012] Optionally, the bowl body further includes a connecting ring, which is disposed on the periphery of the bowl side wall away from the bowl bottom wall. The connecting ring is integrally formed with the bowl side wall and is sealed and welded to the plug.

[0013] By adopting the above technical solution, the sealing performance and connection strength between the bowl and the plug are improved.

[0014] Optionally, each of the bowls at both ends of the roller is provided with a control valve; cleaning water flows into the inner cavity of the roller through the control valve at one end of the roller, and the cleaning water in the inner cavity flows out through the control valve at the other end of the roller to clean the side wall of the inner cavity; hot air flows into the inner cavity of the roller through the control valve at one end of the roller, and the hot air in the inner cavity flows out through the control valve at the other end of the roller to dry the inner cavity of the roller.

[0015] By adopting the above technical solution, control valves are symmetrically set at both ends of the roller to form a fluid channel that runs through both ends, thereby realizing closed-loop cleaning and drying operations inside the roller cavity.

[0016] Optionally, a protective component is also included, which is disposed in the cavity of the bowl body, fixed to the bottom wall of the bowl, and covers the control valve; a clearance distance is provided between the protective component and the roller.

[0017] By adopting the above technical solutions, the operational stability and service life of the control valves are improved, and the positive pressure protection, cleaning and drying functions of the internal cavity are continuously effective.

[0018] Optionally, the protective assembly includes a rigid protective cover, a sealing washer, and a fixing nut; the bowl body is provided with a fixing bolt, the rigid protective cover is provided with a connecting lug, the connecting lug has a through hole for the fixing bolt to pass through, the sealing washer is disposed between the rigid protective cover and the bottom wall of the bowl, the fixing nut is threadedly connected to the fixing bolt to force the rigid protective cover to squeeze the sealing washer, and the rigid protective cover covers the control valve.

[0019] By adopting the above technical solution, the adverse effects of water vapor, dust, and slurry impurities on the control valve can be effectively blocked.

[0020] Optionally, it also includes a flexible annular groove, which is sleeved on the outer periphery of the bowl; the flexible annular groove includes a flexible first sidewall and a flexible second sidewall disposed opposite to each other, and a flexible groove bottom wall disposed between the first sidewall and the second sidewall, the flexible first sidewall being fixedly connected to the bowl; the high-pressure gas in the inner cavity forces the flexible groove bottom wall to fit against the plug, and the high-pressure gas in the inner cavity forces the flexible second sidewall to fit against the inner sidewall of the roller, thereby making the flexible annular groove seal the splice seam between the plug and the inner sidewall of the roller.

[0021] By adopting the above technical solutions, the penetration channels of water vapor, cleaning fluid, and slurry impurities are further blocked, thereby improving the sealing performance of the coating roller.

[0022] Optionally, a plurality of pressure relief holes are provided on the flexible second sidewall, the pressure relief holes are arranged in a ring at intervals, and a clearance distance is provided between the pressure relief holes and the plug.

[0023] By adopting the above technical solution, the risk of external electrode slurry and cleaning solution penetrating into the inner cavity can be further reduced.

[0024] Optionally, the inner wall of the second-generation roller is coated with an anti-rust coating.

[0025] By adopting the above technical solution, the anti-rust coating is directly applied to the surface of the carbon steel substrate inside the roller cavity, completely isolating the carbon steel substrate from air, moisture, and residual impurities, thereby further improving the anti-rust performance of the coating roller.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The bowl body covers the mounting hole inside the plug, cutting off the possible communication path between the inner cavity of the roller and the outside world. This effectively reduces the risk of cleaning fluid, water vapor or electrode slurry seeping into the inner cavity of the roller through the gap between the roller shaft and the plug, thereby reducing the risk of corrosion on the inner wall of the roller, improving the rust prevention performance of the coating roller, and reducing the risk of corrosion inside the coating roller causing adverse effects on the electrode slurry. By controlling the valve to fill the inner cavity with gas, the overall sealing performance of the coating roller is tested, which further reduces the risk of external cleaning liquid, water vapor or electrode slurry penetrating into the inner cavity of the roller and improves the rust prevention performance of the coating roller. The anti-rust coating is directly applied to the surface of the carbon steel substrate inside the roller cavity, completely isolating the carbon steel substrate from air, moisture, and residual impurities, thus further improving the anti-rust performance of the coating roller. Attached Figure Description

[0027] Figure 1 This is a longitudinal sectional view of the coating roller structure in Example 1.

[0028] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0029] Figure 3 This is a longitudinal sectional view of the coating roller structure in Example 2.

[0030] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0031] Figure 5 yes Figure 4 A magnified view of point C in the middle.

[0032] Figure 6 This is a longitudinal sectional view of the coating roller structure in Example 3.

[0033] Figure 7 This is a longitudinal sectional view of the coating roller structure in Example 4.

[0034] Figure 8 yes Figure 7 Enlarged view of point D in the middle.

[0035] Explanation of reference numerals in the attached drawings: 1. Roller; 11. Inner cavity; 12. Anti-rust coating; 2. Plug; 21. Insertion part; 22. Abutment part; 23. Mounting hole; 24. Hub hole; 3. Bowl body; 31. Bowl bottom wall; 32. Bowl side wall; 33. Connecting ring; 34. Bowl cavity; 4. Protective component; 41. Rigid protective cover; 411. Connecting ear; 42. Sealing washer; 43. Fixing nut; 6. Fixing bolt; 7. Control valve; 8. Flexible annular groove; 81. Flexible first side wall; 82. Flexible second side wall; 821. Pressure relief hole; 83. Flexible groove bottom wall; 9. Roller shaft; 91. Limiting protrusion. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1 -8 provides further details regarding this application.

[0037] Example 1: This application discloses a coating roller structure for a battery electrode. (Refer to...) Figure 1 The coating roller structure for battery electrodes includes a hollow roller 1, a plug 2, a bowl 3, and a protective component 4.

[0038] Along the length of roller 1, an inner cavity 11 is formed. The sidewall of the inner cavity 11 of roller 1 is coated with an anti-rust coating 12, which can be formed by applying materials such as Teflon or high-performance epoxy resin paint. The anti-rust coating 12 directly covers the carbon steel substrate surface of the inner cavity 11 of roller 1, completely isolating the carbon steel substrate from air, moisture, and residual impurities, reducing the risk of oxidation and corrosion of the inner wall of carbon steel at the substrate level, and further improving the anti-rust performance of the coating roller.

[0039] The plug 2 is sealed and fixed at both ends of the roller 1. The plug 2 includes an insertion part 21 and an abutment part 22, which are integrally formed. The diameter of the abutment part 22 is larger than that of the insertion part 21. The insertion part 21 is inserted into the inner cavity 11 of the roller 1, and the abutment part 22 abuts against the roller 1. The abutment part 22 is sealed and welded to the roller 1. The insertion part 21 and the abutment part 22 of the plug 2 are provided with mounting holes 23 for the roller shaft 9 to be inserted. The side wall of the mounting hole 23 is also provided with a hub hole 24. The corresponding roller shaft 9 is provided with a limiting protrusion 91 that matches the hub hole 24 on its outer periphery, thereby realizing the assembly of the roller and the plug 2. The plug 2 is configured with a stepped insertion part 21 and an abutment part 22, so that after the plug 2 is sealed and welded to the roller 1, the sealing performance between the plug 2 and the roller shaft 9 can be improved; thus, during subsequent cleaning of the coating roller, the risk of cleaning fluid or other substances penetrating into the inner cavity 11 of the roller 1 can be reduced.

[0040] The bowl body 3 is sealed and fixed to the side of the plug 2 near the roller 1. Along the length of the roller 1, the bowl body 3 extends into the inner cavity 11 of the roller 1, and the projection of the bowl body 3 covers the mounting hole 23. In this embodiment, both the plug 2 and the bowl body 3 are made of stainless steel.

[0041] The bowl body 3 includes a bottom wall 31, a side wall 32, and a connecting ring 33. The side wall 32 extends along the periphery of the bottom wall 31 towards the same side, and the bottom wall 31 and the side wall 32 form a bowl cavity 34. The connecting ring 33 is located on the periphery of the side wall 32 away from the bottom wall 31, and the connecting ring 33 is integrally formed with the side wall 32. The connecting ring 33 is sealed and welded to the plug 2. The sealing and welding of the bowl body 3 to the plug 2 through the connecting ring 33 improves the stability and consistency of the welding quality, thereby improving the sealing performance and connection strength between the bowl body 3 and the plug 2.

[0042] The protective component 4 is disposed in the bowl cavity 34 of the bowl body 3 and is fixed to the bottom wall 31 of the bowl. The protective component 4 covers the control valve 7. A clearance distance is provided between the protective component 4 and the roller shaft 9. By using the protective component 4 fixed in the bowl cavity 34 to protect the control valve 7, the influence of external adverse factors such as external impact and water vapor erosion on the control valve 7 can be effectively isolated, thereby improving the operational stability and service life of the control valve 7 and ensuring the continuous effectiveness of the positive pressure protection, cleaning and drying functions of the inner cavity 11.

[0043] The protective component 4 includes a rigid protective cover 41, a sealing washer 42, and a fixing nut 43. A fixing bolt 6 is provided on the bowl body 3. The rigid protective cover 41 has a connecting lug 411 with a through hole for the fixing bolt 6 to pass through. The sealing washer 42 is positioned between the rigid protective cover 41 and the bottom wall 31 of the bowl. The fixing nut 43 is threadedly connected to the fixing bolt 6, forcing the rigid protective cover 41 to press against the sealing washer 42. The rigid protective cover 41 covers the control valve 7. The addition of the sealing washer 42 between the protective cover and the bottom wall 31, along with the tightening of the nut, forms a tight, sealed structure, effectively preventing the adverse effects of moisture, dust, and slurry impurities on the control valve 7.

[0044] The implementation principle of a coating roller structure for battery electrodes in this application embodiment is as follows: The bowl 3 covers the mounting hole 23 inside the plug 2, cutting off the possible communication path between the inner cavity 11 of the roller 1 and the outside (including the shaft end); effectively reducing the risk of cleaning liquid, water vapor or electrode slurry seeping into the inner cavity 11 of the roller 1 through the gap between the roller shaft 9 and the plug 2, thereby reducing the risk of corrosion of the inner wall of the roller 1, improving the rust prevention performance of the coating roller, and reducing the risk of corrosion inside the coating roller causing adverse effects on the electrode slurry.

[0045] Meanwhile, by combining the bowl body 3 and the plug 2, the complex irregular rust-proof structure is disassembled into the connection of two parts, which reduces the processing difficulty and scrap rate of the parts, and has good industrial operability and cost advantages.

[0046] Example 2: This application discloses a coating roller structure for battery electrodes.

[0047] Reference Figure 1 The difference between Embodiment 2 and Embodiment 1 is that: at least one end of the roller 1 has a control valve 7 in the bowl 3, which connects the bowl cavity 34 and the inner cavity 11, and there is a clearance distance between the control valve 7 and the roller shaft 9; gas is supplied to the inner cavity 11 through the control valve 7, so that the gas pressure in the inner cavity 11 is greater than the external gas pressure. In this embodiment, only one end of the roller 1 has a control valve 7 in the bowl 3, and the control valve 7 is located on the bottom wall 31 of the bowl.

[0048] The implementation principle of a coating roller structure for battery electrodes in this application embodiment is as follows: By controlling valve 7 to introduce gas (such as dry nitrogen or air) into the inner cavity 11, a positive pressure is maintained in the inner cavity 11, resulting in a relatively high gas pressure inside the roller 1. This allows for monitoring of the gas pressure in the inner cavity 11, enabling the overall sealing of the coating roller to be checked before installation or during regular maintenance. Simultaneously, the gas pressure within the inner cavity 11 can be used to detect any minute through-hole defects between the plug 2 and the roller 1, further reducing the risk of external cleaning fluid, moisture, or electrode slurry penetrating into the inner cavity 11 of the roller 1, thus improving the rust prevention performance of the coating roller.

[0049] Example 3: This application discloses a coating roller structure for battery electrodes.

[0050] Reference Figure 1 The difference between Embodiment 3 and Embodiment 2 is that both ends of the roller 1 are equipped with control valves 7, and the two control valves 7 are arranged opposite each other. Cleaning water flows into the inner cavity 11 of the roller 1 through the control valve 7 at one end of the roller 1, and the cleaning water in the inner cavity 11 flows out through the control valve 7 at the other end of the roller 1 to clean the side wall of the inner cavity 11; hot air flows into the inner cavity 11 of the roller 1 through the control valve 7 at one end of the roller 1, and the hot air in the inner cavity 11 flows out through the control valve 7 at the other end of the roller 1 to dry the inner cavity 11 of the roller 1.

[0051] The implementation principle of a coating roller structure for battery electrodes in this application embodiment is as follows: Control valves 7 are symmetrically installed at both ends of roller 1, forming a fluid channel that runs through both ends, enabling closed-loop cleaning and drying of the inner cavity 11 of roller 1. This circulating cleaning method, with water entering at one end and exiting at the other, effectively flushes the sidewalls of the inner cavity 11 of roller 1, removing residual dust, welding impurities, and fine contaminants, preventing long-term adhesion of impurities and corrosion, and the generation of metallic contaminants. After cleaning, a convection drying mode, with hot air entering at one end and exhausting at the other, accelerates the rapid evaporation of moisture from the inner cavity 11, maintaining a dry environment and further reducing the risk of corrosion on the inner wall of roller 1. This also reduces the risk of rust impurities from the coating roller falling off and mixing into the battery electrode slurry, ensuring the cleanliness of the coating process and the product qualification rate.

[0052] Example 4: This application discloses a coating roller structure for battery electrodes.

[0053] Reference Figure 1 The difference between Embodiment 4 and Embodiment 2 is that the coating roller structure further includes a flexible annular groove 8, which is fitted around the outer periphery of the bowl 3. The flexible annular groove 8 includes a flexible first sidewall 81 and a flexible second sidewall 82 arranged opposite to each other, and a flexible groove bottom wall 83 disposed between the first and second sidewalls. The flexible first sidewall 81 is fixedly connected to the bowl 3. The high-pressure gas in the inner cavity 11 forces the flexible groove bottom wall 83 to fit against the plug 2, and the high-pressure gas in the inner cavity 11 forces the flexible second sidewall 82 to fit against the inner sidewall of the roller 1, thereby sealing the seam between the plug 2 and the inner sidewall of the roller 1. Simultaneously, the flexible second sidewall 82 has several pressure relief holes 821, which are arranged in a ring at intervals, and a clearance distance is provided between the pressure relief holes 821 and the plug 2.

[0054] The implementation principle of a coating roller structure for battery electrodes in this application embodiment is as follows: The flexible annular groove 8 serves as a secondary sealing and protective structure. Relying on the high-pressure gas pressure within the inner cavity 11 of the roller 1, it can drive the flexible groove to undergo adaptive deformation, forcing the bottom wall 83 of the flexible groove to tightly adhere to the end face of the plug 2. At the same time, it forces the flexible second side wall 82 to expand outward and tightly adhere to the inner circumferential wall of the roller 1. This further blocks the penetration channels of water vapor, cleaning liquid, and slurry impurities, further reducing the corrosion problem of the roller 1 caused by external impurities penetrating into the inner cavity 11, significantly improving the sealing reliability of the coating roller, and further optimizing the coating quality of the product.

[0055] The annularly spaced pressure relief holes 821 reduce the local bulging and uneven adhesion of the flexible second sidewall 82. The fit between the flexible second sidewall 82 and the inner circumferential wall of the roller 1, and between the flexible groove bottom wall 83 and the plug 2, further reduces the risk of external electrode slurry and cleaning fluid penetrating into the inner cavity 11.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A coating roller structure for battery electrodes, characterized in that: It includes a hollow roller (1), a plug (2) and a bowl (3); along the length of the roller (1), the roller (1) has an inner cavity (11) through it; the plug (2) is sealed and fixed at both ends of the roller (1), and the plug (2) has a mounting hole (23) for the roller shaft (9) to be inserted, and the side wall of the mounting hole (23) also has a hub hole (24); the bowl (3) is sealed and fixed on the side of the plug (2) near the roller (1), and the bowl (3) extends into the inner cavity (11) of the roller (1). Along the length of the roller (1), the projection of the bowl (3) covers the mounting hole (23). The plug (2) and the bowl (3) are both made of stainless steel.

2. The coating roller structure for battery electrodes according to claim 1, characterized in that: The plug (2) includes an insertion part (21) and an abutment part (22). The insertion part (21) and the abutment part (22) are integrally formed. The diameter of the abutment part (22) is larger than the diameter of the insertion part (21). The insertion part (21) is inserted into the inner cavity (11) of the roller (1). The abutment part (22) abuts against the roller (1). The abutment part (22) is sealed and welded to the roller (1).

3. The coating roller structure for battery electrodes according to claim 1, characterized in that: The bowl body (3) includes a bottom wall (31) and a side wall (32) formed by extending from the periphery of the bottom wall (31) toward the same side. The bottom wall (31) and the side wall (32) form a bowl cavity (34). The bowl body (3) at at least one end of the roller (1) is provided with a control valve (7). The control valve (7) connects the bowl cavity (34) and the inner cavity (11). There is a clearance distance between the control valve (7) and the roller (9). Gas is delivered to the inner cavity (11) through the control valve (7), so that the gas pressure in the inner cavity (11) is greater than the external gas pressure.

4. The coating roller structure for battery electrodes according to claim 3, characterized in that: The bowl body (3) also includes a connecting ring (33), which is located on the periphery of the bowl side wall (32) away from the bowl bottom wall (31). The connecting ring (33) is integrally formed with the bowl side wall (32), and the connecting ring (33) is sealed and welded to the plug (2).

5. The coating roller structure for battery electrodes according to claim 3, characterized in that: Both ends of the roller (1) are provided with control valves (7); clean water flows into the inner cavity (11) of the roller (1) through the control valve (7) at one end of the roller (1), and the clean water in the inner cavity (11) flows out through the control valve (7) at the other end of the roller (1) to clean the side wall of the inner cavity (11); hot air flows into the inner cavity (11) of the roller (1) through the control valve (7) at one end of the roller (1), and the hot air in the inner cavity (11) flows out through the control valve (7) at the other end of the roller (1) to dry the inner cavity (11) of the roller (1).

6. The coating roller structure for battery electrodes according to claim 3, characterized in that: It also includes a protective component (4), which is disposed in the bowl cavity (34) of the bowl body (3), the protective component (4) is fixed on the bottom wall (31) of the bowl, and the protective component (4) covers the control valve (7); there is a clearance distance between the protective component (4) and the roller (9).

7. The coating roller structure for battery electrodes according to claim 6, characterized in that: The protective component (4) includes a rigid protective cover (41), a sealing washer (42), and a fixing nut (43); the bowl body (3) is provided with a fixing bolt (6), the rigid protective cover (41) is provided with a connecting ear (411), the connecting ear (411) has a through hole for the fixing bolt (6) to pass through, the sealing washer (42) is provided between the rigid protective cover (41) and the bottom wall (31) of the bowl, and the fixing nut (43) is threadedly connected to the fixing bolt (6) to force the rigid protective cover (41) to squeeze the sealing washer (42), and the rigid protective cover (41) covers the control valve (7).

8. The coating roller structure for battery electrodes according to claim 3, characterized in that: It also includes a flexible annular groove (8), which is sleeved on the outer periphery of the bowl (3); the flexible annular groove (8) includes a flexible first sidewall (81) and a flexible second sidewall (82) arranged opposite to each other, and a flexible groove bottom wall (83) disposed between the first sidewall and the second sidewall, the flexible first sidewall (81) being fixedly connected to the bowl (3); the gas in the inner cavity (11) forces the flexible groove bottom wall (83) to fit against the plug (2), and the gas in the inner cavity (11) forces the flexible second sidewall (82) to fit against the inner sidewall of the roller (1), thereby making the flexible annular groove (8) seal the splice between the plug (2) and the inner sidewall of the roller (1).

9. The coating roller structure for battery electrodes according to claim 8, characterized in that: The flexible second sidewall (82) is provided with a plurality of pressure relief holes (821), the pressure relief holes (821) are arranged in a ring at intervals, and there is a clearance distance between the pressure relief holes (821) and the plug (2).

10. The coating roller structure for battery electrodes according to claim 1, characterized in that: The inner wall of the second-generation inner cavity (11) of the roller (1) is coated with an anti-rust coating (12).

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