Rolling device and control method thereof

Abstract

The invention relates to the technical field of lithium battery production and manufacturing, and discloses a rolling device and a control method thereof.The rolling device comprises a main roller and an expansion part, a first air channel and a second air channel are formed in the main roller, and the second air channel communicates with the first air channel and the expansion part; the controller is used for calculating a preset pressure value required for eliminating wrinkles, the air pressure adjusting mechanism is used for introducing air with the preset pressure value into the first air channel, and the expansion part is driven by air pressure to expand and pushes the blank area of the pole piece to eliminate wrinkles. The wrinkling state is recognized through the visual detection mechanism, the controller calculates the preset pressure value needed for eliminating wrinkles, then the air pressure adjusting mechanism introduces air with the corresponding pressure into the main roller air channel, the expansion part corresponding to the wrinkling area is driven to expand and push the blank area, and therefore wrinkles are eliminated in time. According to the device, the situation that shutdown is needed every time problems occur is avoided, manual intervention can be eradicated, the equipment working efficiency is improved, and the yield is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery production and manufacturing, in particular to a rolling device and a control method thereof. BACKGROUND

[0002] As a green and environmentally friendly battery, lithium ion battery has the advantages of high energy density, high working voltage, high safety performance and long service life, and thus shows superior prospects in portable electronic devices, electric vehicles and energy storage. In the production process of lithium battery, the dried electrode sheet after coating needs to be rolled to reduce the thickness of the electrode sheet to obtain higher compaction. However, under the existing multi-coating mode, due to the thickness difference between the coated area and the uncoated area, i.e. the blank area, in the rolling process, the coated area is stressed, and the foil in the blank area is not stressed, causing the coated area to be extruded and the blank area not to be extruded, thereby causing the blank area to wrinkle. To change the wrinkling state, the current processing method is usually to paste Teflon on the roller. When wrinkles occur, the machine needs to be stopped and the Teflon needs to be re-pasted. At the same time, Teflon is prone to wear during use, which not only affects normal production, but also reduces the quality of the battery. SUMMARY

[0003] The purpose of the present application is to provide a rolling device and a control method thereof to solve the problems in the prior art and effectively reduce the wrinkling of the blank area.

[0004] The present application provides a rolling device, comprising: A rolling mechanism comprising a main roller and an expansion part, the expansion part being arranged along the circumference of the main roller, and the expansion part having an expansion chamber therein, the main roller having a first gas channel and a second gas channel formed therein, the first gas channel extending along the axial direction of the main roller, and the second gas channel extending along the radial direction of the main roller and communicating the first gas channel with the expansion chamber to form a gas pressure transmission path; A visual detection mechanism arranged at the top of the electrode sheet and facing the blank area, for collecting images of the blank area and identifying the wrinkling state; A controller for calculating a preset pressure value required to eliminate wrinkles; A gas pressure adjusting mechanism in communication with the first gas channel for introducing gas with a preset pressure value into the first gas channel and distributing the gas into the expansion chamber, the expansion part being driven to expand by the gas pressure to push the blank area of the electrode sheet to eliminate wrinkles.

[0005] The rolling device described above, wherein preferably, the main roller is provided with a main roller spacer along the circumference, the main roller spacer is provided with a receiving groove at the position corresponding to the expansion part, and the expansion part is embedded in the receiving groove.

[0006] In the roller pressing device described above, preferably, the side of the expansion portion facing the blank area of ​​the electrode sheet has an arc-shaped surface, and the two sides of the expansion portion facing the main roller spacer are respectively provided with stepped fitting portions, the fitting portions being interference-fitted with the main roller spacer.

[0007] In the roller pressing device described above, preferably, the material of the expansion part is any one of rubber, polyurethane or silicone, the surface roughness Ra of the expansion part is ≤1.6, the thickness of the expansion part is 0.5 to 3 mm, and the working pressure of the expansion part is 0 to 1 MPa.

[0008] In the roller pressing device described above, preferably, the main roller spacer is made of either steel or aluminum alloy, the surface roughness Ra of the main roller spacer is ≤3.2, and the thickness of the main roller spacer is in the range of 5 to 20 mm.

[0009] In the roller pressing device described above, preferably, one end of the main roller is provided with a rotary joint, the rotary joint is connected to the output end of the air pressure regulating mechanism through an air pipe, and the input end of the air pressure regulating mechanism is connected to an air source through an air pipe.

[0010] In the roller pressing device described above, preferably, the main roller is provided with a first pressure detection element, which is used to detect a preset pressure value introduced into the first air passage.

[0011] In the roller pressing device described above, preferably, the output end of the visual inspection mechanism is connected to the input end of the controller, and the output end of the controller is connected to the input end of the air pressure regulating mechanism.

[0012] In the roller pressing device described above, preferably, a support frame is provided at the bottom of the main roller, and a second pressure detection element is provided at the bottom of the support frame. The second pressure detection element is used to detect the pressure value between the electrode and the main roller.

[0013] The present invention also provides a control method for adjusting the extension of the blank area of ​​a lithium battery electrode using the above-mentioned device, comprising the following steps: S1. The electrode sheet is conveyed along the upper surface of the main roller, and the vision inspection mechanism collects surface images of the blank area of ​​the electrode sheet in real time and identifies the wrinkling state. S2. The controller calculates the preset pressure value required to eliminate wrinkles based on the wrinkle status information sent by the vision detection mechanism. S3. The controller controls the air pressure regulating mechanism to introduce gas with a preset pressure value into the first air passage. The gas is accurately distributed to the target expansion chamber through the second air passage, causing the expansion part to expand and push the blank area of ​​the electrode sheet to eliminate wrinkles. S4. The visual inspection mechanism acquires new images of the blank area at a preset frequency and feeds them back to the controller; S5. The controller repeats steps S2-S4 according to the wrinkling status of the new blank area image until the visual inspection mechanism recognizes that the blank area is wrinkle-free or the degree of wrinkling meets the preset standard.

[0014] Compared with existing technologies, this invention uses a visual inspection mechanism to collect images of the blank area in real time and identify the wrinkling status. The controller calculates the preset pressure value required to eliminate wrinkles based on the wrinkling information. Then, the air pressure regulating mechanism introduces gas of the corresponding pressure into the main roller air passage, driving the expansion part corresponding to the wrinkled area to expand and push the blank area, thereby eliminating wrinkles in time and allowing the wrinkled part to extend. This device does not require machine stoppage for adjustment like the traditional Teflon pasting method, completely avoiding production interruptions caused by machine stoppage. At the same time, it eliminates the risk of electrode contamination caused by wear of consumables and reduces the cost of consumable replacement. It also has strong mobility and fast response speed, avoiding the need to stop the machine every time a problem occurs. Moreover, it relies heavily on the experience of workers. This invention can eliminate manual intervention, improve equipment working efficiency, and increase the yield rate. Attached Figure Description

[0015] Figure 1 This is a perspective view of the roller pressing device provided in an embodiment of the present invention; Figure 2 This is a partial cross-sectional view of the roller pressing device provided in an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the expansion portion provided in an embodiment of the present invention; Figure 4 This is a flowchart illustrating the adjustment of the blank area extension of the lithium battery electrode provided in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 10. Roller pressing mechanism; 11. Main roller; 110. First air passage; 111. Second air passage; 112. Main roller spacer; 12. Expansion section; 120. Expansion chamber; 121. Arc-shaped surface; 122. Fitting part; 13. Rotary joint; 14. Support frame; 20. Visual inspection agencies; 30. Controller; 31. First pressure sensing element; 32. Second pressure sensing element; 40. Air pressure regulating mechanism; 41. Air source; 42. Air pipe; 50. Electrode; 51. Material area; 52. Blank area. Detailed Implementation

[0017] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] Under the existing multi-coating method, an alternating structure of material area 51 and blank area 52 is formed on the electrode 50. Since the material area 51 has compression space, the blank area 52 has almost no compression space. The rolling process applies uniform pressure to the electrode 50. Therefore, in this case, the blank area 52 will wrinkle. Traditionally, in order to eliminate the wrinkling of the blank area 52, Teflon is usually applied to increase the thickness of the blank area 52. However, in actual applications, the thickness of different incoming materials is different, and the wrinkling situation is also different. Not only is it necessary to manually judge the wrinkling status and replace consumables, but applying Teflon also requires stopping the machine for adjustment, which leads to production interruption. Frequent start-up and shutdown can easily cause tension fluctuations in the electrode 50.

[0019] See Figures 1-3 To address this problem, the present invention provides a roller pressing device, comprising a roller pressing mechanism 10, a vision inspection mechanism 20, a controller 30, and an air pressure regulating mechanism 40, wherein: The rolling mechanism 10 includes a main roller 11 and an expansion section 12. The expansion section 12 is arranged circumferentially along the main roller 11 and has an expansion chamber 120. The main roller 11 has a first air passage 110 and a second air passage 111. The first air passage 110 extends axially along the main roller 11, and the second air passage 111 extends radially along the main roller 11 and connects the first air passage 110 and the expansion chamber 120. The visual inspection mechanism 20 is located on the top of the electrode 50 and faces the blank area 52. It is used to collect images of the blank area 52 and identify the wrinkling state. The controller 30 is used to calculate the preset pressure value required to eliminate wrinkles. The air pressure regulating mechanism 40 is connected to the first air passage 110 and is used to introduce gas of the preset pressure value into the first air passage 110 and distribute the gas into the expansion chamber 120. The expansion section 12 is driven to expand by the air pressure and pushes the blank area 52 of the electrode 50 to eliminate wrinkles.

[0020] In the embodiments provided in this application, the visual inspection mechanism 20 accurately identifies the wrinkled state of the blank area 52, the controller 30 calculates the preset pressure value required to eliminate the wrinkles, and introduces gas at the preset pressure value through the air pressure regulating mechanism 40. The expansion part 12 corresponding to the wrinkled blank area 52 will expand. During the rolling process of the rolling mechanism 10, the expansion part 12 continuously pushes the blank area 52, thereby extending the wrinkled part of the blank area. This device does not require stopping during use and can intervene dynamically in real time, greatly improving the accuracy of wrinkle removal. In addition, traditional Teflon may produce debris after wear, contaminating the surface of the electrode 50. In this embodiment, the expansion part 12 adopts a flexible pushing method driven by air pressure, which can avoid damaging the foil of the electrode 50 and the blank area 52. Moreover, the expansion part 12 has no consumable consumption problem and does not need to be replaced frequently, which can reduce the risk of contamination. It should be noted that because the wrinkled area of ​​the blank area 52 does not make full contact with the expansion cavity 120, after the gas passes through the first air passage 110, the gas acts on the expansion cavity 120, and eventually the surface of the expansion part 12 flattens the wrinkled area. The blank area that has made full contact with the surface of the expansion part 12 is not affected by the change in air pressure or is only slightly affected.

[0021] In this embodiment, the inner diameter of the second airway 111 is in the range of 10 to 25 mm. Its function is to prevent gas from entering the second airway 111 too quickly, which would cause the expansion chamber 120 to expand rapidly and affect the flattening effect.

[0022] See Figure 2 As shown, in some embodiments of this application, the main roller 11 is provided with a main roller sleeve 112 along the circumferential direction. The main roller sleeve 112 has a receiving groove at the position corresponding to the expansion part 12, and the expansion part 12 is embedded in the receiving groove. The receiving groove provides installation space for the expansion part 12 and limits the position of the expansion part 12 to prevent the expansion part 12 from shifting due to the rotation of the main roller 11 or changes in air pressure. When the expansion part 12 is inflated, the receiving groove limits it to prevent the expansion part 12 from over-expanding and deforming or bulging in a non-target direction, ensuring that the expansion force of the expansion part 12 is concentrated on the blank area 52 of the electrode 50, so that the structure of the expansion part 12 is stable.

[0023] See Figure 3 As shown, in one feasible embodiment, the expansion portion 12 has stepped fitting portions 122 on both sides facing the main roller spacer 112, and the fitting portions 122 are interference-fitted with the main roller spacer 112. The stepped fitting portions 122 can make the expansion portion 12 and the main roller spacer 112 form an interference connection, eliminate the gap between the expansion portion 12 and the receiving groove, and make the expansion portion 12 and the main roller spacer 112 tightly engaged, and make the two form a smooth transition. This ensures that when the roller pressing mechanism 10 contacts the electrode 50, the material area 51 and the blank area 52 transition perfectly, and prevents the material area 51 from being damaged due to unevenness at the connection.

[0024] In this embodiment, the number of expansion sections 12 and main roller spacers 112 is increased or decreased according to the number of material areas 51 and blank areas 52 on the electrode sheet 50 to be rolled, and the size of expansion sections 12 and main roller spacers 112 needs to be customized according to the width of material areas 51 and blank areas 52. There should be at least 2 expansion sections 12 and at least 3 main roller spacers 112.

[0025] See Figure 3 As shown, in this embodiment, the side of the expansion portion 12 facing the blank area 52 of the electrode 50 has an arc-shaped surface 121. The wrinkles in the blank area 52 are mostly arc-shaped protrusions. The arc-shaped surface 121 of the expansion portion 12 can better fit the wrinkle shape, and extend the blank area 52 during the rolling process. Moreover, when the arc-shaped surface 121 contacts the electrode 50, it can avoid scratching the foil material of the blank area 52, reducing scratches or tears on the foil surface.

[0026] In some embodiments of this application, the expansion portion 12 is made of any one of rubber, polyurethane, or silicone. The surface roughness Ra of the expansion portion 12 is ≤1.6, the thickness of the expansion portion 12 ranges from 0.5 to 3 mm, and the working pressure of the expansion portion 12 is 0 to 1 MPa. Since the expansion portion 12 needs to be repeatedly inflated and deflated, it requires a flexible material with excellent fatigue resistance and good wear resistance. It can achieve flexible pushing of the blank area 52 through deformation, and avoid rigid contact damage to the foil. The low surface roughness of the expansion portion 12, preferably Ra ≤1.6, is intended to reduce frictional resistance and prevent scratching of the foil surface when the expansion portion 12 contacts the blank area 52 of the electrode 50.

[0027] The main roller spacer 112 is made of either steel or aluminum alloy, with a surface roughness Ra ≤ 3.2 and a thickness ranging from 5 to 20 mm. The main roller spacer 112 provides a stable support frame for the expansion section 12, preventing deformation of the main roller spacer 112 during inflation. Therefore, a rigid material is preferred for the main roller spacer 112. Furthermore, the outer diameter of the main roller spacer 112 ranges from 80 to 200 mm. A larger outer diameter would increase its weight, generating centrifugal force when the roller pressing mechanism 10 rotates, leading to operational imbalance and affecting the flattening effect on the blanking area 52.

[0028] See Figures 1-2As shown, in this embodiment, one end of the main roller 11 is provided with a rotary joint 13. The rotary joint 13 is connected to the output end of the air pressure regulating mechanism 40 through an air pipe 42, and the input end of the air pressure regulating mechanism 40 is connected to an air source 41 through an air pipe 42. The main roller 11 eliminates wrinkles in the blank area 52 by rolling and pressing in conjunction with the expansion section 12. The air source 41 inputs the original air pressure to the air pressure regulating mechanism 40 through the air pipe 42. The air pressure regulating mechanism 40 adjusts the original air pressure to the preset pressure required to eliminate wrinkles according to the instructions of the controller 30. The rotary joint 13 can realize the flexible connection between the static air pipe 42 and the rotating main roller 11, avoiding the air pipe 42 from getting tangled due to the rotation of the main roller 11, ensuring continuous air pressure transmission, and providing a stable air pressure source for the inflation of the expansion section 12. The air pressure regulating mechanism 40 preferably adopts a servo proportional air pressure regulating device, which can output pressure accurately according to instructions, and the error is controlled within ±1%.

[0029] See Figure 2 As shown, in this embodiment, the main roller 11 is provided with a first pressure detection element 31, which is used to detect the preset pressure value entering the first air passage 110. The first pressure detection element 31 can monitor the actual air pressure entering the first air passage 110 in real time, and compare it with the preset pressure value calculated by the controller 30 to verify the effectiveness of air pressure regulation. In addition, by monitoring the actual air pressure of the first air passage 110 in real time, it is also possible to provide early warning of air passage failures, stop the machine in time for troubleshooting, and reduce production losses.

[0030] See Figure 1 As shown, a support frame 14 is provided at the bottom of the main roller 11, and a second pressure detection element 32 is provided at the bottom of the support frame 14. The second pressure detection element 32 is used to detect the pressure value between the electrode 50 and the main roller 11. The support frame 14 is supported on both sides of the main roller 11, and the second pressure detection element 32 is directly opposite the bottom of the support frame 14. It can be used to monitor the actual pressure when the electrode 50 contacts the main roller 11, and prevent the electrode 50 from breaking due to excessive pressure. Both the first pressure detection element 31 and the second pressure detection element 32 are pressure sensors, and the output terminals of both the first pressure detection element 31 and the second pressure detection element 32 are connected to the input terminal of the controller 30 for feedback of pressure signals.

[0031] See Figure 1As shown, in this embodiment, the output of the visual inspection mechanism 20 is connected to the input of the controller 30, and the output of the controller 30 is connected to the input of the air pressure regulating mechanism 40. The visual inspection mechanism 20 adopts a CCD visual inspection device, and the number can be increased according to the field of view of its CCD recognition system, the number of blank areas 52 of incoming materials, and the detection accuracy. At the same time, each CCD recognition system has automatic focusing and automatic inspection functions, and in terms of mechanical installation, it meets the independent adjustment functions in four directions: up, down, left, and right. The CCD visual inspection device is a mature existing technology, and its method for recognizing wrinkles will not be elaborated here.

[0032] See Figure 4 As shown, the present invention also provides a control method for preventing wrinkling of the blank area 52 of the lithium battery electrode 50 using the above-mentioned device, comprising the following steps: S1. The electrode 50 is conveyed along the upper surface of the main roller 11. The vision inspection mechanism 20 collects the surface image of the blank area 52 of the electrode 50 in real time and identifies the wrinkling status. S2. The controller 30 calculates the preset pressure value required to eliminate wrinkles based on the wrinkle status information sent by the vision inspection mechanism 20. S3. The controller 30 controls the air pressure regulating mechanism 40 to introduce gas with a preset pressure value into the first air passage 110. The gas is precisely distributed to the target expansion chamber 120 through the second air passage 111, causing the expansion part 12 to expand and push the blank area 52 of the electrode 50 to eliminate wrinkles. S4. The visual inspection mechanism 20 acquires new images of the blank area 52 at a preset frequency and feeds them back to the controller 30. S5. The controller 30 repeats steps S2-S4 according to the wrinkling status of the new blank area 52 image until the visual inspection agency 20 recognizes that the blank area 52 is not wrinkled or the degree of wrinkling meets the preset standard.

[0033] In this embodiment, a complete closed-loop control is formed by acquiring a new image of the blank area 52 and repeating steps S2-S4 to ensure that wrinkles are completely eliminated. The actual pressure value entering the first air passage 110 is detected by the first pressure detection element 31 and compared with the preset pressure value calculated by the controller 30. During the adjustment process, the actual pressure value is fed back to the controller 30 to achieve closed-loop adjustment. Furthermore, the pressure value between the electrode 50 and the main roller 11 is detected by the second pressure detection element 32 to prevent the electrode 50 from breaking.

[0034] It should be noted that the controller 30 can be equipped with built-in intelligent analysis software. Based on the wrinkling data provided by the vision inspection agency 20, and combined with preset algorithms and parameter models, the required air pressure can be derived in reverse. The wrinkling data includes, but is not limited to, the amplitude, range, density, and location of the wrinkles. The controller 30 is preloaded with a preset mathematical model or database to calculate the preset pressure value required to eliminate the wrinkling state. The preset mathematical model or database can be the optimal elimination pressure corresponding to different wrinkling parameters recorded through a large number of experiments during the research and development stage and stored in the database, or an algorithm model established based on the principles of material mechanics. The controller 30 outputs the preset pressure value through algorithmic formulas, such as dynamic calculations combining the functional relationship between foil elongation and pressure. The above calculation methods are all mature existing technologies and will not be elaborated here.

[0035] The present invention is further verified through the following two embodiments.

[0036] Example 1 The incoming material coating process has 3 material areas 51 and 4 blanking areas 52, with 4 expansion sections 12 and 5 main roller spacers 112. The visual inspection mechanism 20 detects wrinkles in the blanking area 52. The controller 30 calculates that the air pressure inside the expansion section 12 needs to be adjusted to 0.3MPa. The controller 30 inputs the signal to the air pressure regulating device through the signal connection line. After the air pressure regulating device completes the adjustment, the first pressure detection element 31 detects whether the pressure in the first air passage 110 is the air pressure requirement calculated by the controller 30. At the same time, the visual inspection mechanism 20 detects that the wrinkles in the blanking area 52 have disappeared after adjustment.

[0037] Example 2 The difference from Example 1 is that when the visual inspection mechanism 20 detects that the thickness of the material area 51 of the incoming electrode 50 has decreased, the controller 30 adjusts the preset air pressure to 0.25MPa, and the wrinkles can be eliminated after inspection.

[0038] Verification has shown that this invention addresses the wrinkling problem that occurs during the rolling process when existing methods increase the thickness of the material area 51 and the blank area 52 of the electrode sheet 50 are compensated for by pasting Teflon to increase the thickness of the roller. This invention uses visual detection of the wrinkling state, combined with an intelligent algorithm to output a pressure adjustment value to change the state of the expansion section 12, thereby promptly eliminating wrinkles in the blank area 52. It boasts strong maneuverability, fast response speed, and avoids the need to stop the machine every time a problem occurs. Furthermore, it relies heavily on worker experience. This invention eliminates manual intervention, improves equipment efficiency, and increases the yield rate.

[0039] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A roller pressing device, characterized in that, include: A rolling mechanism includes a main roller and an expansion section. The expansion section is arranged circumferentially along the main roller and has an expansion chamber. The main roller has a first air passage and a second air passage. The first air passage extends axially along the main roller, and the second air passage extends radially along the main roller and connects the first air passage and the expansion chamber. A visual inspection mechanism is located on top of the electrode sheet and faces the blank area, used to collect images of the blank area and identify the wrinkled state; The controller is used to calculate the preset pressure value required to eliminate wrinkles; The air pressure regulating mechanism is connected to the first air passage and is used to introduce gas with a preset pressure value into the first air passage and distribute the gas to the expansion chamber. The expansion part expands under the air pressure and pushes the blank area of ​​the electrode to eliminate wrinkles.

2. The roller pressing device according to claim 1, characterized in that, The main roller is provided with a main roller spacer along the circumference, and the main roller spacer is provided with a receiving groove at the position corresponding to the expansion part, and the expansion part is embedded in the receiving groove.

3. The roller pressing device according to claim 2, characterized in that, The expansion section has an arc-shaped surface on the side facing the blank area of ​​the electrode sheet, and stepped fitting parts are provided on both sides of the expansion section facing the main roller sleeve, and the fitting parts are interference fit with the main roller sleeve.

4. The roller pressing device according to claim 1, characterized in that, The expansion part is made of any one of rubber, polyurethane or silicone, the surface roughness Ra of the expansion part is ≤1.6, the thickness of the expansion part is 0.5 to 3 mm, and the working pressure of the expansion part is 0 to 1 MPa.

5. The roller pressing device according to claim 2, characterized in that, The main roller spacer is made of either steel or aluminum alloy, with a surface roughness Ra≤3.2 and a thickness range of 5~20mm.

6. The roller pressing device according to claim 1, characterized in that, One end of the main roller is provided with a rotary joint, which is connected to the output end of the air pressure regulating mechanism through an air pipe, and the input end of the air pressure regulating mechanism is connected to an air source through an air pipe.

7. The roller pressing device according to claim 1, characterized in that, The main roller is equipped with a first pressure detection element, which is used to detect a preset pressure value entering the first air passage.

8. The roller pressing device according to claim 1, characterized in that, The output of the visual inspection mechanism is connected to the input of the controller, and the output of the controller is connected to the input of the air pressure regulating mechanism.

9. The roller pressing device according to claim 1, characterized in that, The bottom of the main roller is provided with a support frame, and the bottom of the support frame is provided with a second pressure detection element. The second pressure detection element is used to detect the pressure value between the electrode and the main roller.

10. A control method for preventing wrinkling in the blank area of ​​lithium battery electrode sheets using the rolling device described in claims 1-9, characterized in that, Includes the following steps: S1. The electrode sheet is conveyed along the upper surface of the main roller, and the vision inspection mechanism collects surface images of the blank area of ​​the electrode sheet in real time and identifies the wrinkling state. S2. The controller calculates the preset pressure value required to eliminate wrinkles based on the wrinkle status information sent by the vision detection mechanism. S3. The controller controls the air pressure regulating mechanism to introduce gas with a preset pressure value into the first air passage. The gas is accurately distributed to the target expansion chamber through the second air passage, causing the expansion part to expand and push the blank area of ​​the electrode sheet to eliminate wrinkles. S4. The visual inspection mechanism acquires new images of the blank area at a preset frequency and feeds them back to the controller; S5. The controller repeats steps S2-S4 according to the wrinkling status of the new blank area image until the visual inspection mechanism recognizes that the blank area is wrinkle-free or the degree of wrinkling meets the preset standard.

Images