Rolling and slitting all-in-one machine for lithium battery pole piece

Abstract

The invention discloses a lithium battery pole piece rolling and slitting all-in-one machine which comprises a frame body and a rolling part arranged on the frame body and used for rolling a pole piece, and further comprises a slitting structure, a second cutting roller comprises a second pressing roller and a second cutter, and a third cutting roller comprises a third pressing roller and a third cutter; after the pole piece is extruded by the second press roll and the third press roll and cooled, an active substance layer on the pole piece is cut through the cooperation of the third press roll and the third cutter, the pole piece passes through the first press roll and the third press roll and passes through the first cutter, the first cutter cuts a current collector on the pole piece, and slitting is completed. Through the combined design of prepressing, low temperature and fitting cutting, the pole piece is cooled, the molecular binding force of an active substance and the temporary binding force of a binder are improved, the hard brittleness and the shear resistance are reduced, and high-quality slitting can be achieved through a common cutter; the tool replacement frequency is reduced, the tool research and development and use cost is reduced, meanwhile, the technological process is simplified, and the production continuity is improved.

Description

A rolling and slitting machine for lithium battery electrodes Technical Field

[0001] This invention relates to the field of lithium battery electrode rolling and slitting technology, and in particular to an integrated rolling and slitting machine for lithium battery electrodes. Background Technology

[0002] In the production of lithium-ion batteries, electrode cutting is one of the key processes, and the cutting quality directly determines the battery's safety, cycle life, and energy density. As power batteries iterate towards higher areal density, higher compaction, and higher energy density, problems such as edge chipping, powder shedding, and interlayer delamination, which are common in the electrode cutting process, are becoming increasingly prominent and have become the core bottleneck restricting battery production efficiency and product qualification rate.

[0003] The essence of electrode chipping during cutting is that the shearing force generated by the blade on the electrode at the moment of cutting causes brittle fracture of the hard and brittle active material layer, rather than ideal plastic cutting. There are three main causes: First, the active material itself is hard and brittle with weak intermolecular bonding, making it prone to particle detachment under shearing force; second, stress concentration occurs during cutting, and the blade does not adhere properly to the electrode, leading to excessive local stress and causing the active material to crack; third, in high-area-density, high-pressure electrodes, there are interlayer gaps between the active material layer and the current collector, resulting in insufficient bonding force, which makes them prone to interlayer delamination under cutting stress, thus forming chipping.

[0004] Currently, high-area-density positive electrodes use diamond-coated cemented carbide circular cutters (hardness HRA95 or higher, improving wear resistance by 3-5 times), silicon-based negative electrodes use micro-toothed circular cutters (the blade is micro-toothed to reduce shearing force with the active material layer), and composite current collector electrodes use ultra-thin blade circular cutters (blade thickness <0.1mm) to reduce the risk of interlayer delamination during slitting. Although this can reduce burrs and edge chipping, it requires frequent tool replacements, and the research and development costs of the tools are high, and the process is complex.

[0005] Therefore, this application proposes an integrated rolling and slitting machine for lithium battery electrode sheets. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems by proposing an integrated rolling and slitting machine for lithium battery electrode sheets.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A rolling and slitting machine for lithium battery electrodes includes a frame, a rolling section disposed on the frame for rolling the electrodes, and a slitting structure.

[0009] The slitting structure includes a first cutting roller, a second cutting roller, and a third cutting roller. The first and third cutting rollers are conveyed with a cooling medium for cooling the electrode sheets. The first cutting roller includes a first pressure roller and a first cutter. The second cutting roller includes a second pressure roller and a second cutter. The third cutting roller includes a third pressure roller and a third cutter.

[0010] After the electrode sheet is squeezed and cooled by the second and third pressure rollers, the active material layer on the electrode sheet is cut by the cooperation of the third pressure roller and the third cutter. The electrode sheet passes through the first and third pressure rollers and the current collector on the electrode sheet is cut by the first and third cutters to complete the slitting.

[0011] Preferably, the frame is provided with an unwinding roller, which is rotatably mounted on the upper end of the frame to support the wound electrode sheets.

[0012] Preferably, it also includes a plurality of first guide rollers, all of which are rotatably mounted on the frame and are distributed at unequal heights on the frame.

[0013] Preferably, the pressure roller section includes two compaction rollers disposed on the frame, the two compaction rollers being distributed vertically for compacting the electrode sheet; when the pressure roller section compacts the electrode sheet using cold rollers, the temperature of the compaction rollers needs to be controlled at room temperature ±5℃; when the pressure roller section compacts the electrode sheet using hot rollers, the temperature of the compaction rollers is controlled at 60-120℃.

[0014] Preferably, both the first and third cutting rollers have internal flow chambers for the flow of a cold medium.

[0015] Both ends of the first cutting roller are provided with a first liquid supply pipe that communicates with the flow chamber;

[0016] Both ends of the third cutting roller are provided with a second liquid supply pipe that communicates with the flow chamber.

[0017] Preferably, the system further includes a supply and circulation mechanism for conveying a cold medium into the flow chamber. The supply and circulation mechanism includes a liquid storage tank, on which a supply pump is mounted. The inlet of the supply pump is connected to the liquid storage tank, and the outlet of the supply pump is connected to a delivery pipe. The delivery pipe is connected to a first supply pipe and a second supply pipe through a first distribution box. A return pipe is connected to the liquid storage tank, and the return pipe is connected to the first supply pipe and the second supply pipe through a second distribution box.

[0018] Preferably, it further includes a heat exchange structure, which is located at the upper end of the liquid storage tank and is sealed and installed through the upper end of the liquid storage tank to reduce the temperature of the cold medium.

[0019] Preferably, the device further includes a winding structure, which is mounted on the frame. The winding structure includes two winding shafts distributed vertically, and multiple winding drums are mounted on each of the two winding shafts. The winding drums are evenly distributed along the axial direction of the winding shafts, and the multiple winding drums on the upper and lower winding shafts are staggered.

[0020] Preferably, it further includes a second guide roller, which is rotatably mounted on the frame and is located above the first cutting roller, the second cutting roller, and the third cutting roller.

[0021] Preferably, when the first cutting roller, the second cutting roller, and the third cutting roller cut the electrode sheet, the first cutting roller, the second cutting roller, and the third cutting roller all abut against the electrode sheet.

[0022] Compared with the prior art, the beneficial effects of this invention are as follows:

[0023] 1. The electrode is cooled by a cold medium at 0-10℃, which improves the bonding force of active material molecules and the temporary bonding force of the binder, and reduces hardness, brittleness and shear resistance; combined with the pre-pressing of the pressure roller to eliminate interlayer gaps, the cutter and the electrode are more closely attached, the shear force is dispersed and stress concentration is avoided.

[0024] 2. Without relying on special high-cost tools such as diamond coatings, micro-toothed or ultra-thin cutting edges, high-quality slitting can be achieved with ordinary tools through the combination design of "pre-compression + low temperature + bonding cutting"; reducing the frequency of tool replacement, lowering the cost of tool research and development and use, while simplifying the process flow and improving production continuity.

[0025] 3. The pressure rollers of the first, second, and third cutting rollers abut against the electrode sheet, and the rubber layer contacts to reduce damage to the electrode sheet. At the same time, they achieve compression and limiting to prevent the electrode sheet from moving axially or radially during cutting.

[0026] In summary, this invention, through a combination of "pre-compression + low temperature + bonding and cutting," cools the electrode sheet, enhances the binding force of active material molecules and the temporary bonding force of the binder, reduces hardness and brittleness and shear resistance, and allows high-quality slitting to be achieved with ordinary cutting tools; it also reduces the frequency of tool replacement, lowers the cost of tool research and development and use, simplifies the process flow, and improves production continuity. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the structure of a rolling and slitting machine for lithium battery electrode sheets proposed in this invention;

[0028] Figure 2 is a schematic diagram of the structure of a rolling and slitting machine for lithium battery electrodes proposed in this invention, viewed from the left side.

[0029] Figure 3 is a schematic diagram of the structure of a rolling and slitting machine for lithium battery electrodes proposed in this invention from a frontal view.

[0030] Figure 4 is a schematic diagram of the structure of the first cutting roller, the second cutting roller and the third cutting roller in the integrated rolling and slitting machine for lithium battery electrode sheets proposed in this invention;

[0031] Figure 5 is a schematic diagram of the structure of the first cutting roller in a rolling and slitting machine for lithium battery electrodes proposed in this invention;

[0032] Figure 6 is a schematic diagram of the first cutting roller, the second cutting roller and the third cutting roller of the integrated rolling and slitting machine for lithium battery electrode sheets proposed in this invention, viewed from the front.

[0033] Figure 7 is a schematic diagram of the structure of the lithium battery electrode sheet wound on the first cutting roller, the second cutting roller and the third cutting roller in the integrated rolling and slitting machine of the present invention.

[0034] In the diagram: 1. Frame, 2. Unwinding roller, 3. Roller pressing section, 4. Liquid supply pipe, 5. Liquid storage tank, 6. First cutting roller, 61. First pressure roller, 62. First annular mounting groove, 63. First cutter, 7. First guide roller, 8. Rewinding drum, 9. Return pipe, 10. Second guide roller, 11. First diversion box, 12. Second diversion box, 13. Second cutting roller, 131. Second pressure roller, 132. Second annular mounting groove, 133. Second cutter, 14. Third cutting roller, 141. Third pressure roller, 142. Third annular mounting groove, 143. Third cutter, 15. First liquid supply pipe, 16. Heat exchange structure, 17. Rewinding shaft, 18. Second liquid supply pipe, 19. Flow chamber, 20. Electrode. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Referring to Figures 1-7, a rolling and slitting machine for lithium battery electrodes includes a frame 1 and a rolling section 3 disposed on the frame 1 for rolling electrodes 20. The rolling section 3 includes two compaction rollers disposed on the frame 1. The two compaction rollers are distributed vertically to compact the electrodes 20. The gap between the two compaction rollers can be adjusted to control the rolling pressure and avoid high pressure causing the active material to fall off, or the current collector (copper foil / aluminum foil) to wrinkle or break.

[0037] The rolling speed must be synchronized with the speed of the preceding coating and drying processes. Excessive speed can lead to electrode slippage and thickness fluctuations, while insufficient speed reduces production efficiency. The rolling speeds for both positive and negative electrodes must be individually matched (negative electrode graphite sheets are prone to powder shedding, so their rolling speed is typically slightly slower than that for the positive electrode). Roller temperature and gap are also crucial. For cold rolling, the roller temperature must be controlled (room temperature ±5℃) to prevent condensation and powder adhesion. For hot rolling (such as high-nickel ternary electrodes), the roller temperature should be controlled between 60-120℃, and the roller gap must be calibrated in real time to avoid the electrode being "thick in the middle and thin at the edges" due to roller wear and deformation.

[0038] It also includes a slitting structure, which includes a first cutting roller 6, and the first cutting roller 6 includes a first pressure roller 61. The outer surface of the first pressure roller 61 is provided with a plurality of first annular mounting grooves 62. The plurality of first annular mounting grooves 62 are linearly arrayed in the axial direction of the first pressure roller 61 (the distance between two adjacent ones is the width of the slitting electrode 20, and different spacing molds can be adapted according to the actual slitting width requirements); wherein, an annular first cutter 63 is installed in the first annular mounting groove 62 for cutting the electrode 20;

[0039] The second cutting roller 13 includes a second pressure roller 131. The outer surface of the second pressure roller 131 is provided with a plurality of second annular mounting grooves 132. The plurality of second annular mounting grooves 132 are linearly arrayed in the axial direction of the second cutting roller 13 (the distance between two adjacent grooves is the width of the slit electrode 20, and different spacing molds can be adapted according to the actual slit width requirements). Among them, annular second cutters 133 are installed in the second annular mounting grooves 132 for cutting the electrode 20.

[0040] The third cutting roller 14 includes a third pressure roller 141. The outer surface of the third pressure roller 141 is provided with a plurality of third annular mounting grooves 142. The plurality of third annular mounting grooves 142 are linearly arrayed in the axial direction of the third cutting roller 14 (the distance between two adjacent grooves is the width of the slit electrode 20, and different spacing molds can be adapted according to the actual slit width requirements). Among them, annular third cutters 143 are installed in the third annular mounting grooves 142 for cutting the electrode 20.

[0041] The second cutter 133 and the third cutter 143 are configured to cut the active material layer on the electrode 20, that is, to cut the active material layer on both sides of the electrode 20. The first cutter 63 and the third cutter 143 are configured to cut the current collector on the electrode 20. The current collector is commonly made of copper foil / aluminum foil. After the current collector is cut, the electrode 20 is cut.

[0042] It is important to note that when cutting the electrode 20, the first pressure roller 61, the second pressure roller 131, and the third pressure roller 141 all abut against the electrode 20. This means that the first pressure roller 61, the second pressure roller 131, and the third pressure roller 141 can compress and limit the electrode 20 on both sides during cutting. This setup allows for pre-rolling the cutting area by the first pressure roller 61, the second pressure roller 131, and the third pressure roller 141 before cutting. This serves several purposes: first, it further compacts the active material layer and the current collector in the cutting area, reducing interlayer gaps and preventing interlayer separation caused by stress during cutting; second, it ensures that the electrode surface in the cutting area is tangential to the cutter, resulting in a closer contact between the blade and the electrode 20, dispersing shearing force and preventing the active material from cracking due to localized stress concentration; and third, the pre-pressing action of the rollers can fix the electrode, preventing it from shaking during cutting and further improving the flatness of the cutting edge.

[0043] The surfaces of the first pressure roller 61, the second pressure roller 131, and the third pressure roller 141 are all provided with a rubber layer. The rubber layer can reduce damage to the electrode 20 by contacting the electrode 20. At the same time, the rubber layer will deform after being squeezed so that the third cutter 143 can cooperate with the first cutter 63 and the second cutter 133 to cut the electrode 20.

[0044] To reduce edge chipping of the active material layer, a cooling medium for cooling the electrode 20 is conveyed in the first cutting roller 6 and the third cutting roller 14. The cooling medium can be water or oil, used to cool the electrode 20; the specific settings are as follows:

[0045] Both the first cutting roller 6 and the third cutting roller 14 have a flow chamber 19 for the flow of cold medium inside. Both ends of the first cutting roller 6 are provided with a first liquid supply pipe 15 communicating with the flow chamber 19. Both ends of the third cutting roller 14 are provided with a second liquid supply pipe 18 communicating with the flow chamber 19. In this way, the cold medium can be delivered into the flow chamber 19 through the first liquid supply pipe 15 and the second liquid supply pipe 18 at one end. After a certain amount of cold medium accumulates in the flow chamber 19, the cold medium will flow out from the first liquid supply pipe 15 and the second liquid supply pipe 18 at the other end. This can continuously change the cold medium in the flow chamber 19, which can better exchange heat with the electrode 20.

[0046] To ensure continuous flow of the refrigerant within the flow chamber 19, a supply and circulation mechanism is provided. This mechanism includes a storage tank 5 fixed to the frame 1 by a bracket, which stores the refrigerant. A supply pump is mounted on the storage tank 5, with a threaded cap at its inlet. A threaded connector is installed on the storage tank 5, with the threaded cap and connector threaded together and both fitted with sealing rings to ensure airtightness and prevent leakage. A delivery pipe 4 is connected to the outlet of the supply pump, and this pipe is connected to a first supply pipe 15 and a second supply pipe 18 via a first distribution box 11. Both the first and second supply pipes 15 and 18 are equipped with rotary joints, the other end of which is connected to the first distribution box 11. This ensures that the refrigerant within the first distribution box 11 can flow into the first and second supply pipes 15 and then into the flow chamber 19 without affecting the rotation of the pipes.

[0047] The liquid storage tank 5 is connected to a return pipe 9, which is connected to the first liquid supply pipe 15 and the second liquid supply pipe 18 through the second distribution box 12. Similarly, the first liquid supply pipe 15 and the second liquid supply pipe 18 are both equipped with rotary joints, and the other end of the rotary joints is connected to the first distribution box 11. This ensures that the rotation of the first liquid supply pipe 15 and the second liquid supply pipe 18 is not affected, while the cold medium in the first liquid supply pipe 15 and the second liquid supply pipe 18 can flow into the second distribution box 12, and finally flow into the liquid storage tank 5 through the return pipe 9, realizing the circulation of the cold medium.

[0048] When the cold medium flows in the flow chamber 19, it can exchange heat and cool the first cutting roller 6 and the third cutting roller 14, thereby exchanging heat and cooling the electrode 20. The low temperature environment of 0-10℃ will increase the intermolecular bonding force of the active material of the electrode (such as high-nickel ternary, lithium iron phosphate, silicon-based), reduce hardness and brittleness, and enhance shear resistance. When the blade cuts through the area, the active material particles will not fall off brittlely, but will be sheared synchronously with the current collector, thus avoiding edge breakage from the root. At the same time, the low temperature will cause the binder (PVDF, CMC) of the electrode to be in a micro-coagulation state, temporarily increasing the bonding force, further preventing powdering of the active material layer and delamination between layers.

[0049] Since the flowing cold medium will be heated by heat exchange, a heat exchange structure 16 is also included. The heat exchange structure 16 is located at the upper end of the liquid storage tank 5 and is sealed through the upper end of the liquid storage tank 5 to reduce the temperature of the cold medium. The heat exchange structure 16 can be a semiconductor refrigeration chip with its cooling end extending into the liquid storage tank 5 and its heating end equipped with a corresponding heat sink to ensure stable operation of the semiconductor refrigeration chip; or a serpentine tube that runs through the liquid storage tank 5, through which cooling water or oil is circulated for heat exchange of the cold medium. Multiple temperature sensors can be installed on the liquid storage tank 5 to monitor the temperature of the cold medium in the liquid storage tank 5 in real time, such as controlling the temperature between 0-10℃.

[0050] For example, high-nickel ternary cathode (NCM811 / 955): High-nickel ternary cathodes have the strongest hardness and brittleness, and the most severe edge chipping when cut. Low temperature of 0-10℃ can significantly reduce its brittleness. The active material layer is pre-pressed and compacted by pressure rollers, and the edge chipping width can be reduced from the traditional 50-80μm to 5-10μm, basically eliminating visible edge chipping. This is the core application scenario of this solution.

[0051] High areal density lithium iron phosphate cathode (areal density > 200g / ㎡): The active material layer of lithium iron phosphate is thick, and interlayer cracking is prone to occur under high pressure. Low temperature of 0-10℃ can improve the temporary adhesion of the binder. Pre-pressing with pressure rollers eliminates interlayer gaps, and the edge breakage can be reduced from 30-50μm to less than 5μm, with no powder shedding.

[0052] The frame 1 is provided with an unwinding roller 2, which is rotatably mounted on the upper end of the frame 1 to support the rolled electrode sheet 20. The electrode sheet 20 on the unwinding roller 2 is guided by a plurality of first guide rollers 7 arranged on the frame 1. Since the plurality of first guide rollers 7 are distributed at different heights on the frame 1, the purpose is to guide the electrode sheet 20 to the first cutting roller 6, the second cutting roller 13 and the third cutting roller 14 with a suitable slope for cutting.

[0053] As shown in Figure 7, the electrode 20 is wound around the first cutting roller 6, the second cutting roller 13, and the third cutting roller 14. After being squeezed and cooled by the second pressure roller 131 and the third pressure roller 141, the active material layer on the electrode 20 is cut by the cooperation of the third pressure roller 141 and the third cutter 143. The electrode 20 with the active material layer cut will surround the surface of the third pressure roller 141. At this time, the third cutter 143 is located in the gap of the active material layer being cut, which can limit the electrode 20 and prevent the electrode 20 from moving axially when passing through the second pressure roller 131 and the third pressure roller 141, ensuring the accuracy and stability of the cutting. When the electrode 20 with the active material layer cut passes between the first pressure roller 61 and the third pressure roller 141, the current collector on the electrode 20 is cut by the first cutter 63 and the third cutter 143, completing the slitting. The slitting electrode 20 surrounds the surface of the first cutting roller 6. The first cutter 63 can limit the slitting electrode 20 so that it will not move radially.

[0054] It also includes a winding structure, which is installed on the frame 1. The winding structure includes two winding shafts 17 distributed vertically. Multiple winding drums 8 are installed on each of the two winding shafts 17. The winding drums 8 are evenly distributed along the axial direction of the winding shafts 17, and the multiple winding drums 8 on the two winding shafts 17 are staggered. The slit electrode sheets 20 are staggered and wound on the winding drums 8, so that the slit electrode sheets 20 can be wound up.

[0055] It also includes a second guide roller 10, which is rotatably mounted on the frame 1. The second guide roller 10 is located above the first cutting roller 6, the second cutting roller 13 and the third cutting roller 14. The electrode sheet 20 guided by the first guide roller 7 is conveyed to the first cutting roller 6, the second cutting roller 13 and the third cutting roller 14 through the second guide roller 10 for slitting.

[0056] The working process of the 20-roller slitting of electrode sheets in this invention is as follows: Core working process

[0057] The rolled electrode sheet 20 is released by the unwinding roller 2 and conveyed to the slitting area at a preset slope by the first guide roller 7 and the second guide roller 10 with unequal height distribution, ensuring stable electrode sheet tension; the electrode sheet is first compacted by the upper and lower compacting rollers of the roller pressing section 3, with cold roller pressing (room temperature ±5℃) or hot roller pressing (60-120℃) adapted according to the electrode sheet type to reduce the interlayer gap between the active material layer and the current collector;

[0058] The electrode sheet is first squeezed and limited by the second pressure roller 131 and the third pressure roller 141. The third cutter 143 cooperates with the second cutter 133 to cut off the active material layers on both sides. At the same time, the cooling medium (0-10℃) in the third cutter 14 cools the electrode sheet. Then the electrode sheet enters between the first pressure roller 61 and the third pressure roller 141. The first cutter 63 and the third cutter 143 cooperate to cut off the current collector, completing the complete slitting.

[0059] After being slit, the electrode sheets are simultaneously wound up by the winding shaft 17 through the staggered winding drums 8, thus preventing the electrode sheets from tangling or wearing out.

[0060] The flow chambers 19 in the first cutting roller 6 and the third cutting roller 14 circulate and transport the refrigerant. The refrigerant circulation is achieved through the supply circulation mechanism (liquid storage tank 5, supply pump, diversion box, etc.). The heat exchange structure 16 maintains the refrigerant at a low temperature of 0-10℃, enhances the molecular bonding force of active substances, and inhibits edge breakage and powder shedding.

[0061] The first cutting roller 6, the second cutting roller 13, and the third cutting roller 14 all abut against the electrode sheet, reducing damage by contacting the rubber layer. At the same time, they compact the electrode sheet to make the cutter fit more tightly, disperse the shearing force, and avoid stress concentration.

[0062] To achieve higher quality slitting of the electrode sheet 20, the second pressure roller 131 can also be hollow in the middle, with both ends connected to the first distribution box 11 and the second distribution box 12 via pipes and rotary joints. This allows the internal cooling medium to be transported, resulting in better cooling of both sides of the electrode sheet.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rolling and slitting machine for lithium battery electrodes, comprising a frame (1) and a rolling section (3) disposed on the frame (1) for rolling electrodes (20), characterized in that, It also includes a slitting structure; the slitting structure includes a first cutting roller (6), a second cutting roller (13), and a third cutting roller (14), wherein the first cutting roller (6) and the third cutting roller (14) are conveyed with a cooling medium for cooling the electrode sheet (20), the first cutting roller (6) includes a first pressure roller (61) and a first cutter (63), the second cutting roller (13) includes a second pressure roller (131) and a second cutter (133), and the third cutting roller (14) includes a third pressure roller (131) and a second cutter (133). 41) and the third cutter (143); after the electrode (20) is squeezed and cooled by the second pressure roller (131) and the third pressure roller (141), the active material layer on the electrode (20) is cut by the cooperation of the third pressure roller (141) and the third cutter (143). When the electrode (20) passes between the first pressure roller (61) and the third pressure roller (141), the current collector on the electrode (20) is cut by the first cutter (63) and the third cutter (143) to complete the slitting.

2. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 1, characterized in that, The frame (1) is provided with an unwinding roller (2), which is rotatably mounted on the upper end of the frame (1) to support the coiled electrode sheet (20).

3. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 1, characterized in that, It also includes multiple first guide rollers (7), which are rotatably mounted on the frame (1) and are distributed at different heights on the frame (1).

4. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 1, characterized in that, The pressure roller section (3) includes two compaction rollers arranged on the frame (1), which are distributed vertically and used to compact the electrode sheet (20). When the pressure roller section (3) compacts the electrode sheet (20) with a cold roller, the temperature of the compaction roller needs to be controlled at room temperature ±5℃. When the pressure roller section (3) compacts the electrode sheet (20) with a hot roller, the temperature of the compaction roller is controlled at 60-120℃.

5. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 1, characterized in that, The first cutting roller (6) and the third cutting roller (14) are both provided with a flow cavity (19) for the flow of cold medium; the first cutting roller (6) is provided with a first liquid supply pipe (15) at both ends that communicates with the flow cavity (19); the third cutting roller (14) is provided with a second liquid supply pipe (18) at both ends that communicates with the flow cavity (19).

6. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 4, characterized in that, It also includes a supply circulation mechanism for conveying cold medium into the flow chamber (19). The supply circulation mechanism includes a liquid storage tank (5), a supply pump is provided on the liquid storage tank (5), the inlet end of the supply pump is connected to the liquid storage tank (5), the outlet end of the supply pump is connected to a liquid delivery pipe (4), the liquid delivery pipe (4) is connected to the first liquid supply pipe (15) and the second liquid supply pipe (18) through the first diversion box (11), and a return pipe (9) is connected on the liquid storage tank (5). The return pipe (9) is connected to the first liquid supply pipe (15) and the second liquid supply pipe (18) through the second diversion box (12).

7. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 6, characterized in that, It also includes a heat exchange structure (16), which is located at the upper end of the liquid storage tank (5) and is sealed through the upper end of the liquid storage tank (5) to reduce the temperature of the cold medium.

8. The integrated rolling and slitting machine for lithium battery electrode sheets according to claim 1, characterized in that, It also includes a winding structure, which is set on the frame (1). The winding structure includes two winding shafts (17) distributed vertically. Multiple winding drums (8) are installed on each of the two winding shafts (17). The winding drums (8) are evenly distributed along the axial direction of the winding shafts (17), and the multiple winding drums (8) on the upper and lower winding shafts (17) are staggered.

9. A rolling and slitting machine for lithium battery electrodes according to claim 1, characterized in that, It also includes a second guide roller (10), which is rotatably mounted on the frame (1) and is located above the first cutting roller (6), the second cutting roller (13) and the third cutting roller (14).

10. A rolling and slitting machine for lithium battery electrodes according to claim 1, characterized in that, When the first cutting roller (6), the second cutting roller (13) and the third cutting roller (14) cut the electrode sheet (20), the first cutting roller (6), the second cutting roller (13) and the third cutting roller (14) all abut against the electrode sheet (20).

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