Liquid scraping cleaning device and method for lithium battery diaphragm after extraction

Abstract

The invention discloses a liquid scraping and cleaning device and method after lithium battery diaphragm extraction, the liquid scraping and cleaning device after lithium battery diaphragm extraction comprises a liquid scraping roller, the two ends of the liquid scraping roller are respectively provided with a distance adjusting mechanism, and the two ends of the liquid scraping roller are respectively assembled on the two distance adjusting mechanisms in a sliding manner; a liquid scraping roller moving motor for driving the liquid scraping roller to move is arranged on the distance adjusting mechanism, and the moving direction of the liquid scraping roller is perpendicular to the axis of the liquid scraping roller; tension sensors are respectively arranged at two ends of the liquid scraping roller; a cleaning mechanism is arranged on one side of the liquid scraping roller and comprises a cleaning appliance parallel to the liquid scraping roller and supporting mechanisms connected to the two ends of the cleaning appliance, the supporting mechanisms are slidably assembled on the distance adjusting mechanism, and a cleaning mechanism moving motor for driving the supporting mechanisms to drive the cleaning appliance to move is arranged on the distance adjusting mechanism. The moving direction of the supporting mechanism is perpendicular to the axis of the liquid scraping roller, and the length of the cleaning appliance is larger than that of the liquid scraping roller.

Description

Technical Field

[0001] The invention relates to a device and method for cleaning scraping liquid after extraction of a lithium battery diaphragm, belonging to the technical field of lithium battery diaphragm production. Background Art

[0002] Lithium-ion batteries mainly consist of four key parts, namely the positive electrode, negative electrode, electrolyte and separator. As an important component of lithium-ion batteries, the separator is located between the positive and negative electrodes, isolating the positive and negative electrodes and preventing short circuits, while allowing lithium ions to pass through.

[0003] In the production process of lithium battery diaphragms, extraction is a key process in diaphragm production. The extraction process is to use an extractant to extract paraffin oil from the diaphragm to form a porous structure. However, due to the volatile nature of the extractant itself, the consumption in production is relatively large. In order to reduce the consumption of the extractant, a scraping roller is added at the outlet of the diaphragm leaving the extraction tank to scrape the extractant on the surface of the diaphragm, which has the effect of reducing the liquid on the diaphragm and achieving the dual effects of reducing the consumption of the extractant and drying the membrane surface. However, there are some key issues in the current design of extraction and drying that need to be solved urgently.

[0004] Firstly, during the use of the scraper roller, there is a problem that the scraper roller cannot be cleaned online and foreign matter cannot be collected after cleaning, which causes foreign matter to scratch the membrane surface during the long-term use of the scraper roller, resulting in longitudinal continuous bright spots, affecting the voltage resistance of the diaphragm; during the regular interruption and cleaning process, the extraction agent in the extraction tank needs to be emptied, resulting in a lot of time waste, seriously affecting production efficiency.

[0005] Secondly, there is the problem of uneven scraping during the scraping process, which leads to the problem of longitudinal continuous bright spots and oil spots on the membrane surface. The scraping roller distance needs to be adjusted regularly according to the thickness of the membrane. During the adjustment of the scraping roller, the distance between the scraping roller and the membrane surface can only be set by visual observation, which mainly depends on the operator's experience and cannot give a clear indication and appropriate range; the adjustment takes a long time, and sometimes it needs to be adjusted repeatedly according to the membrane surface to achieve the expected effect.

[0006] Again, after the adjustment of the scraper roller is completed, due to the change in the amount of liquid on the membrane surface, problems such as electrostatic breakdown, foreign matter accumulation, water spots on the membrane surface, and longitudinal continuous bright spots are likely to occur, and the subsequent process parameters need to be adjusted to match.

[0007] In summary, the extraction scraping cleaning and supporting parameters of the prior art need to be further designed and optimized to solve the above problems and improve the production efficiency and quality of the diaphragm. Summary of the invention

[0008] The purpose of the present invention is to provide a post-extraction scraping liquid cleaning device for lithium battery diaphragms, which is used to solve the technical problems of uneven scraping liquid after extraction of lithium battery diaphragms in the prior art, and bright spots and oil spots on the membrane surface after scraping liquid. At the same time, the present invention also provides a post-extraction scraping liquid cleaning method for lithium battery diaphragms.

[0009] The present invention adopts the following technical scheme: a post-scraping cleaning device for lithium battery diaphragm extraction, comprising a scraping device, a distance adjustment mechanism and a cleaning mechanism, the scraping device comprising a scraping roller, both ends of the scraping roller are respectively provided with distance adjustment mechanisms, and the moving direction of the scraping roller is perpendicular to the axis of the scraping roller; a cleaning mechanism is provided on one side of the scraping roller, the cleaning mechanism comprises a cleaning tool arranged parallel to the scraping roller and a supporting mechanism connected to both ends of the cleaning tool, the moving direction of the supporting mechanism is perpendicular to the axis of the scraping roller, and the cleaning tool is used to scrape liquid and impurities on the surface of the scraping roller.

[0010] The two ends of the scraper roller are respectively slidably assembled on two distance adjustment mechanisms, and the distance adjustment mechanism is provided with a scraper roller moving motor for driving the scraper roller to move; tension sensors are respectively provided at the two ends of the scraper roller, and the tension sensors are used to detect the tension at the two ends of the scraper roller; the support mechanism is slidably assembled on the distance adjustment mechanism, and the distance adjustment mechanism is provided with a cleaning mechanism moving motor for driving the support mechanism to drive the cleaning tool to move; the length of the cleaning tool is greater than the length of the scraper roller.

[0011] The distance adjustment mechanism includes a base, on which a wiper roller moving track and a cleaning mechanism moving track are provided, both ends of the wiper roller are respectively connected with wiper roller sliders, the end of the wiper roller is rotatably assembled on the wiper roller slider, the wiper roller slider is slidably assembled on the wiper roller moving track, the wiper roller moving motor is connected to the wiper roller slider and drives the wiper roller slider to move; a cleaning mechanism slider slidably assembled on the cleaning mechanism moving track is fixedly connected to the support mechanism, and the cleaning mechanism moving motor is connected to the cleaning mechanism slider.

[0012] One end of the scraper roller is also connected to a scraper roller rotating motor for driving the scraper roller to rotate.

[0013] The base adopts an L-shaped bracket, which has an upwardly arranged horizontal surface and a vertically arranged vertical surface. The vertical surfaces of the two L-shaped brackets are close to each other, the scraper roller moving track is arranged on the horizontal surface of the L-shaped bracket, and the cleaning mechanism moving track is arranged on the vertical surface of the L-shaped bracket.

[0014] The distance adjustment mechanism includes a base, on which a wiper roller moving track and a cleaning mechanism moving track are provided, both ends of the wiper roller are respectively connected with wiper roller sliders, the end of the wiper roller is rotatably assembled on the wiper roller slider, the wiper roller slider is slidably assembled on the wiper roller moving track, the wiper roller moving motor is connected to the wiper roller slider and drives the wiper roller slider to move; a cleaning mechanism slider slidably assembled on the cleaning mechanism moving track is fixedly connected to the support mechanism, and the cleaning mechanism moving motor is connected to the cleaning mechanism slider.

[0015] One end of the scraper roller is also connected to a scraper roller rotating motor for driving the scraper roller to rotate.

[0016] The base adopts an L-shaped bracket, which has an upwardly arranged horizontal surface and a vertically arranged vertical surface. The vertical surfaces of the two L-shaped brackets are close to each other, the scraper roller moving track is arranged on the horizontal surface of the L-shaped bracket, and the cleaning mechanism moving track is arranged on the vertical surface of the L-shaped bracket.

[0017] The support mechanism adopts a drainage pipe with a gate-shaped structure, and the drainage pipe includes a horizontal section and vertical sections respectively connected to both ends of the horizontal section. The cleaning device has two groups, and the two groups of cleaning tools are respectively connected to the upper and lower positions of the horizontal section of the drainage pipe. The cleaning tool located at the upper side is arranged obliquely upward, and the cleaning tool located at the lower side is arranged obliquely downward. Liquid inlet holes are evenly opened on the horizontal section of the drainage pipe. In specific use, one group of cleaning tools can be selected according to the steering requirements of the scraper roller.

[0018] The cleaning tool is a scraper or a wire mesh.

[0019] A foreign matter collection box is arranged below the cleaning tool, a filter screen is arranged in the foreign matter collection box, and a liquid guide tube is connected to the bottom of the foreign matter collection box.

[0020] A method for cleaning scraping liquid after extraction of lithium battery diaphragm, comprising the following steps: (1) moving a scraping roller to a position close to a membrane surface by a scraping roller moving motor, adjusting the distance between the left and right ends of a scraping device according to the tension value on both sides of the scraping roller, keeping the tension on both sides of the scraping roller the same, and setting the initial tension value of both ends of the scraping roller to be above 100 kg; (2) when the scraping roller rotates following the diaphragm transmission system, adjusting the tension of the scraping roller to increase the tension at both ends of the scraping roller, and the scraping roller contacts the membrane surface to remove the residual liquid on the diaphragm membrane surface; (3) when the scraping roller rotates following the diaphragm transmission system, using a cleaning mechanism to clean the surface of the scraping roller, contacting the surface of the scraping roller with a cleaning tool to scrape off the liquid and foreign matter on the surface of the scraping roller, filtering the scraped liquid and foreign matter, and recovering the excess extractant; or, the scraping roller rotates driven by the scraping roller rotating motor, flushing the scraping roller, filtering the flushed liquid and foreign matter, and recovering the excess extractant.

[0021] Preferably, in step (1), the initial tension value range of the two ends of the scraping roller is set to 100kg-125kg.

[0022] Preferably, in step (2), the increment of the tension of the scraping roller is 20-60 kg.

[0023] Preferably, in step (3), when the scraping roller rotates counterclockwise, a cleaning device is used that is set obliquely downward, and the cleaning device and the axis of the scraping roller have an angle of 30-70°, and the cleaning device scrapes liquid and impurities from the bottom of the scraping roller upward; when the scraping roller rotates clockwise, a cleaning device is used that is set obliquely upward, and the cleaning device and the axis of the scraping roller have an angle of 30-70°, and the cleaning device scrapes liquid and impurities from the top of the scraping roller downward; in step (2), in the diaphragm transmission system, the roller temperature of the temperature control roller is set between 25-35°C, and the roller speed ratio of the temperature control roller is between 0.999-0.102.

[0024] A diaphragm obtained by the above-mentioned lithium battery diaphragm extraction and scraping liquid cleaning method.

[0025] The beneficial effects of the present invention are as follows: the present invention moves the scraping roller to a position close to the membrane surface through the scraping roller moving motor, adjusts the distance between the left and right ends of the scraping device according to the tension values ​​on both sides of the scraping roller, keeps the tension on both sides of the scraping roller consistent, observes the membrane surface, and achieves the best scraping effect without deviation and wrinkles on the roller surface, realizes data visualization and precision of the scraping device, and achieves the purpose of standardization. The initial value of the scraping roller tension is set under the best effect. In the case of film breaking or product thickness adjustment, the distance between the scraping roller and the membrane surface is fine-tuned to achieve consistency of tension on both sides, which prevents the deviation of the membrane surface and inaccurate observation with the naked eye. The present invention cleans the scraping roller online through a cleaning mechanism, and production does not need to be interrupted when cleaning the roller surface, which reduces the consumption of the extractant. The present invention can solve the technical problems of uneven scraping after diaphragm extraction and bright spots and oil spots on the membrane surface after scraping. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a post-scraping cleaning device for lithium battery diaphragm extraction according to an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cleaning mechanism; Figure 3 yes Figure 1 A partial enlarged view of the cleaning mechanism; Figure 4 It is the tension test data table at both ends of the scraper roller; Figure 5 It is the experimental data table of the tension increase at both ends of the scraping roller; Figure 6It is a cleaning tool angle adjustment experimental data table; Figure 7 It is the experimental data table of roller temperature and roller speed ratio of temperature-controlled roller; Figure 8 It is a schematic diagram of the angle between the cleaning mechanism and the wiper roller.

[0027] In the figure: 1- scraper roller; 2- foreign matter collection box; 3- cleaning mechanism moving motor; 4- cleaning mechanism moving track; 5- scraper roller moving motor; 6- tension sensor; 7- scraper roller rotation motor; 8- scraper roller moving track; 9- base, 10- liquid inlet hole; 11- cleaning tool; 12- drainage pipe. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] A post-scraping cleaning device for scraping liquid from a lithium battery diaphragm according to an embodiment of the present invention comprises a scraping device, the scraping device comprising a scraping roller 1, two ends of the scraping roller 1 are respectively provided with distance adjustment mechanisms, the two ends of the scraping roller 1 are respectively slidably mounted on two distance adjustment mechanisms, the distance adjustment mechanism is provided with a scraping roller moving motor 5 for driving the scraping roller to move, the moving direction of the scraping roller 1 is perpendicular to the axis of the scraping roller 1; two ends of the scraping roller 1 are respectively provided with tension sensors 6, the tension sensor 6 is used to detect the tension at the two ends of the scraping roller 1; one side of the scraping roller 1 is provided with a cleaning mechanism, the cleaning mechanism comprises a cleaning tool 11 arranged parallel to the scraping roller and a supporting mechanism connected to the two ends of the cleaning tool 11, the supporting mechanism is slidably mounted on the distance adjustment mechanism, the distance adjustment mechanism is provided with a cleaning mechanism moving motor 3 for driving the supporting mechanism to drive the cleaning tool to move, the moving direction of the supporting mechanism is perpendicular to the axis of the scraping roller, the cleaning tool 11 is used to scrape liquid and impurities on the surface of the scraping roller 1, and the length of the cleaning tool 11 is greater than the length of the scraping roller 1.

[0030] The distance adjustment mechanism includes a base 9, on which a wiper roller moving track 8 and a cleaning mechanism moving track 4 are provided. The two ends of the wiper roller 1 are respectively connected with wiper roller sliders, and the end of the wiper roller 1 is rotatably mounted on the wiper roller slider, and the wiper roller slider is slidably mounted on the wiper roller moving track 8. The wiper roller moving motor 8 is connected to the wiper roller slider and drives the wiper roller slider to move; the support mechanism is fixedly connected with a cleaning mechanism slider slidably mounted on the cleaning mechanism moving track 4, and the cleaning mechanism moving motor 3 is connected to the cleaning mechanism slider. One end of the wiper roller 1 is also connected with a wiper roller rotating motor 7 for driving the wiper roller 1 to rotate. The base 9 adopts an L-shaped bracket, and the L-shaped bracket has a horizontal surface set upward and a vertical surface set vertically. The vertical surfaces of the two L-shaped brackets are close to each other. The wiper roller moving track 7 is set on the horizontal surface of the L-shaped bracket, and the cleaning mechanism moving track 4 is set on the vertical surface of the L-shaped bracket.

[0031] The support mechanism adopts a drainage pipe 12 with a gate-shaped structure. The drainage pipe 12 includes a horizontal section and vertical sections respectively connected to the two ends of the horizontal section. There are two groups of cleaning tools 11. The two groups of cleaning tools 11 are respectively connected to the upper and lower positions of the horizontal section of the drainage pipe. Liquid inlet holes 10 are evenly opened on the horizontal section of the drainage pipe 12. The cleaning tools located at the top are set obliquely upward, and the cleaning tools located at the bottom are set obliquely downward. During specific use, one group of cleaning tools can be selected according to the steering requirements of the scraper roller 1. A foreign matter collection box 2 is provided below the cleaning tool 11, and a filter screen is provided in the foreign matter collection box 2. A liquid guide tube (not shown in the drawings) is connected to the bottom of the foreign matter collection box. The cleaning tool adopts a scraper or a screen. The cleaning tool in this embodiment adopts a scraper.

[0032] The post-extraction scraping and cleaning method of the lithium battery diaphragm of this embodiment comprises the following steps: (1) Move the scraper roller to a position close to the membrane surface by means of a scraper roller moving motor, and adjust the distance between the left and right ends of the scraper device according to the tension values ​​on both sides of the scraper roller to keep the tension on both sides of the scraper roller the same. Set the initial tension value at both ends of the scraper roller to be above 100 kg. Preferably, set the initial tension value at both ends of the scraper roller to a range of 100 kg to 125 kg. (2) When the scraping roller rotates with the diaphragm transmission system, the tension of the scraping roller is adjusted to increase the tension at both ends of the scraping roller. The scraping roller contacts the membrane surface to remove the residual liquid on the diaphragm membrane surface. The preferred scraping roller tension increment is 20~60Kg; in the diaphragm transmission system, the roller temperature of the temperature control roller is set between 25-35℃, and the roller speed ratio of the temperature control roller is between 0.999-0.102.

[0033] (3) When the scraper roller rotates following the diaphragm transmission system, the surface of the scraper roller is cleaned by a cleaning mechanism, and the cleaning device contacts the surface of the scraper roller to scrape off the liquid and foreign matter on the surface of the scraper roller, and the scraped liquid and foreign matter are filtered to recover the excess extractant; or, the scraper roller is rotated by the scraper roller rotation motor, and the scraper roller is rinsed, and the rinsed liquid and foreign matter are filtered to recover the excess extractant.

[0034] When the scraping roller rotates counterclockwise, a cleaning device is set obliquely downward, and the cleaning device has an angle of 30-70° with the axis of the scraping roller. The cleaning device scrapes liquid and impurities from the bottom of the scraping roller upward; when the scraping roller rotates clockwise, a cleaning device is set obliquely upward, and the cleaning device has an angle of 30-70° with the axis of the scraping roller. The cleaning device scrapes liquid and impurities from the top of the scraping roller downward.

[0035] The present invention sets tension sensors at both ends of the scraping roller, uses digital tension sensors, and finds the best tension as the optimal zero point (i.e. calibration) through designing experiments. The specific experiments are as follows: the tension setting range of the left end of the scraping roller is 50kg-400kg, and the tension setting range of the right end is 50kg-400kg. Through multiple experiments under different tension conditions, the amount of liquid on the membrane surface and the deviation of the membrane surface are collected to find the best adjustment zero point, which is used as the initial value of the tension at both ends of the scraping roller. The experimental results are as follows: Figure 4 As shown in the table, the results show that: when the tension at both ends of the tension roller is inconsistent, the membrane surface deviates; when the tension at both ends is 50kg, the membrane surface is in non-uniform contact with the scraping roller; when the tension at both ends is above 150kg, the amount of liquid on the membrane surface begins to decrease; when the tension at both ends is 100kg-125kg, the membrane surface is in full contact with the scraping roller and the amount of liquid is large, which is the best effect as the initial zero point.

[0036] The initial zero point refers to the initial value of the tension at both ends of the scraping roller when the scraping roller is close to the film surface.

[0037] In this embodiment, a scraper is used as a cleaning device. The thickness of the scraper is 0.5mm-5mm, the length is 4.1m (longer than the scraper roller), and the width is 2cm. The scraper is made of polytetrafluoroethylene. By adjusting the cleaning device at different angles of 0°-180° and the scraper roller tension increment of 20kg-120kg, the best cleaning effect of the scraper roller is collected and used as a reference parameter. Specific experimental data are as follows Figure 5 The results show that when the speed of the scraper roller decreases continuously in the process of close contact with the scraper roller until the tension increases by about 100kg, the scraper roller stops completely. According to the actual rotation of the scraper roller on site, the scraper roller has a better rotation effect when the tension increases by about 20kg-60kg, and the scraper roller cleaning effect is better.

[0038] The tension increment of the scraper roller refers to the tension value increased on the basis of the original tension of the scraper roller when the scraper roller is in normal scraping operation.

[0039] The tension of the scraper roller is increased by 50kg. When the scraper roller rotates normally, the angle adjustment test results of the scraper roller cleaning device are as follows: Figure 6 Table and Figure 8 As shown in the schematic diagram of the middle angle, the results show that when the scraper roller rotates counterclockwise, the cleaning effect is better when the angle between the scraper and the central axis of the scraper roller is 30-70°; when the scraper roller rotates clockwise, the cleaning effect is better when the angle between the scraper and the central axis of the scraper roller is 30°-70°.

[0040] The angle of the scraper can be adjusted by adding a position adjustment knob between the cleaning tool 11 and the drainage pipe 12, or the cleaning tool 11 can be disassembled and manually installed according to different angles.

[0041] In order to solve the problems of static electricity, water spots, bright spots and so on on the film surface after the scraping roller is close to the film surface, the tension of the scraping roller, the temperature of the temperature control roller and the roller speed ratio are adjusted, and the problems of static electricity, water spots and bright spots are collected. According to the exploration of the state of liquid on the film surface when the scraping roller is close to the film surface, the tension of the scraping roller is selected between 100-400kg for the experiment. When the tension of the scraping roller is 300kg, the static electricity in the drying room begins to exceed the standard, and the actual static electricity value reaches 2.3-5kv. It cannot be improved by reducing the roller temperature and roller speed ratio simultaneously. When the scraping tension is lower than 150kg, the water spots on the film surface cannot be eliminated by adjusting the roller speed ratio and roller temperature, and bright spots appear in the middle of the film surface. In summary, the verification results show that the best is when the scraping roller tension is 150-300kg.

[0042] Select the scraping roller tension of 150kg, adjust the roller temperature and roller speed ratio to match, and verify the results as follows Figure 7 The results show that: under the same doctor roller tension, static electricity and wrinkles are better at low temperature and high speed ratio, but water spots are better at high roller temperature. Taking into account the three defects and the actual adjustment state, the roller temperature of the temperature control roller is set between 25-35℃, and the roller speed ratio of the temperature control roller is between 0.999-0.102.

[0043] The present invention moves the scraping roller to a position close to the film surface by a scraping roller moving motor, adjusts the distance between the left and right ends of the scraping device according to the tension values ​​on both sides of the scraping roller, keeps the tension on both sides of the scraping roller consistent, observes the film surface, and achieves the best scraping effect without deviation and roller surface wrinkles, realizes data visualization and precision of the scraping device, and achieves the purpose of standardization. The initial value of the scraping roller tension is set under the best effect. In the case of film breaking or product thickness adjustment, the consistency of the tension on both sides is achieved by fine-tuning the distance between the scraping roller and the film surface, thereby preventing the film surface from deviation and inaccurate observation with the naked eye.

[0044] When the scraping roller rotates with the transmission system and the non-scraping roller rotation motor drives the rotation, the position of the cleaning mechanism is adjusted to make the tension at both ends of the scraping roller consistent, so that the scraping roller can be cleaned in the process of self-rotation driven by the membrane surface under constant tension conditions. After cleaning, the cleaning mechanism is driven back to its original position by the cleaning mechanism moving motor 3, and the flushing device is started to flush the cleaning mechanism, so as to achieve the purpose of online cleaning. Foreign matter attached to the cleaning mechanism flows to the foreign matter collection box after flushing, and after being filtered by the filter, the excess extractant flows back to the extraction tank for continued use.

[0045] When the scraper roller is driven by the scraper roller rotating motor to rotate, the scraper roller moving motor 5 is used to drive and adjust the position of the scraper roller so that the scraper roller is close to the cleaning mechanism. Under a fixed tension, the scraper roller is driven by the scraper roller rotating motor to rotate, and the flushing device is turned on synchronously to clean and flush the scraper roller. After the foreign matter and the extractant pass through the filtering device at the bottom, the excess extractant flows back to the extraction tank for continued use. A filter screen and a conduit are added to the foreign matter collection box to filter foreign matter and guide the extractant.

[0046] In this embodiment, the motor drives the scraping roller and the cleaning mechanism to move along the track, so that the distance between the scraping roller and the membrane surface, and the distance between the cleaning tool and the scraping roller can be controlled. The cleaning tool can be selected according to the material of the scraping roller, and a screen or a scraper of corresponding material can be used, and can be set at the upper or lower position of the scraping roller according to the rotation direction of the scraping roller.

[0047] The present invention can reduce the adjustment time and zero-finding time of the scraping device by arranging a tension sensor and adding a cleaning mechanism, thereby reducing the consumption of the extractant. By referring to the tension data, the risk of membrane surface deviation and membrane surface wrinkling is reduced, and the risk of film breakage is reduced, thereby improving production capacity. The scraping roller is cleaned online by the cleaning mechanism, and production does not need to be interrupted when cleaning the roller surface, thereby reducing the consumption of the extractant.

Claims

1. A cleaning device for scraping liquid after extraction of lithium battery diaphragm, characterized in that: It includes a scraping device, a distance adjustment mechanism and a cleaning mechanism. The scraping device includes a scraping roller. Distance adjustment mechanisms are respectively provided at both ends of the scraping roller. The moving direction of the scraping roller is perpendicular to the axis of the scraping roller. A cleaning mechanism is provided on one side of the scraping roller. The cleaning mechanism includes a cleaning tool arranged parallel to the scraping roller and a supporting mechanism connected to both ends of the cleaning tool. The moving direction of the supporting mechanism is perpendicular to the axis of the scraping roller. The cleaning tool is used to scrape liquid and impurities on the surface of the scraping roller.

2. The post-extraction scraping liquid cleaning device for lithium battery diaphragm according to claim 1, characterized in that: The two ends of the scraper roller are respectively slidably assembled on two distance adjustment mechanisms, and the distance adjustment mechanism is provided with a scraper roller moving motor for driving the scraper roller to move; tension sensors are respectively provided at the two ends of the scraper roller, and the tension sensors are used to detect the tension at the two ends of the scraper roller; the support mechanism is slidably assembled on the distance adjustment mechanism, and the distance adjustment mechanism is provided with a cleaning mechanism moving motor for driving the support mechanism to drive the cleaning tool to move; the length of the cleaning tool is greater than the length of the scraper roller.

3. The post-extraction scraping liquid cleaning device for lithium battery diaphragm according to claim 2, characterized in that: The distance adjustment mechanism includes a base, on which a wiper roller moving track and a cleaning mechanism moving track are provided, both ends of the wiper roller are respectively connected with wiper roller sliders, the end of the wiper roller is rotatably assembled on the wiper roller slider, the wiper roller slider is slidably assembled on the wiper roller moving track, the wiper roller moving motor is connected to the wiper roller slider and drives the wiper roller slider to move; a cleaning mechanism slider slidably assembled on the cleaning mechanism moving track is fixedly connected to the support mechanism, and the cleaning mechanism moving motor is connected to the cleaning mechanism slider.

4. The post-extraction scraping liquid cleaning device for lithium battery diaphragm according to claim 2, characterized in that: One end of the scraper roller is also connected to a scraper roller rotating motor for driving the scraper roller to rotate.

5. The post-extraction scraping liquid cleaning device for lithium battery diaphragm according to claim 3, characterized in that: The base adopts an L-shaped bracket, which has an upwardly arranged horizontal surface and a vertically arranged vertical surface. The vertical surfaces of the two L-shaped brackets are close to each other, the scraper roller moving track is arranged on the horizontal surface of the L-shaped bracket, and the cleaning mechanism moving track is arranged on the vertical surface of the L-shaped bracket.

6. The post-extraction scraping liquid cleaning device for lithium battery diaphragm according to claim 1, characterized in that: The support mechanism adopts a drainage pipe with a gate-shaped structure, and the drainage pipe includes a horizontal section and vertical sections respectively connected to both ends of the horizontal section. The cleaning device has two groups, and the two groups of cleaning tools are respectively connected to the upper and lower positions of the horizontal section of the drainage pipe. The cleaning tool located at the upper side is arranged obliquely upward, and the cleaning tool located at the lower side is arranged obliquely downward. Liquid inlet holes are evenly opened on the horizontal section of the drainage pipe. The cleaning tool is a scraper or a wire mesh.

7. The post-extraction scraping liquid cleaning device for lithium battery diaphragm according to claim 1, characterized in that: A foreign matter collection box is arranged below the cleaning tool, a filter screen is arranged in the foreign matter collection box, and a liquid guide tube is connected to the bottom of the foreign matter collection box.

8. A method for cleaning a lithium battery diaphragm after scraping liquid after extraction, characterized in that: (1) Move the scraper roller to a position close to the membrane surface through the scraper roller moving motor. According to the tension value on both sides of the scraper roller, adjust the distance between the left and right ends of the scraper device to keep the tension on both sides of the scraper roller the same. Set the initial tension value of both ends of the scraper roller to be above 100 kg; (2) When the scraper roller rotates following the diaphragm transmission system, adjust the tension of the scraper roller to increase the tension at both ends of the scraper roller. The scraper roller contacts the membrane surface to remove the residual liquid on the diaphragm membrane surface; (3) When the scraper roller rotates following the diaphragm transmission system, use the cleaning mechanism to clean the surface of the scraper roller. The cleaning tool contacts the surface of the scraper roller to scrape off the liquid and foreign matter on the surface of the scraper roller. Filter the scraped liquid and foreign matter to recover the excess extractant; Alternatively, the scraping roller is driven by a scraping roller rotating motor to rotate, the scraping roller is rinsed, the rinsed liquid and foreign matter are filtered, and the excess extractant is recovered.

9. The method for cleaning the lithium battery diaphragm after extraction by scraping liquid according to claim 8, characterized in that: In step (1), the initial tension value range of the two ends of the scraping roller is set to 100kg-125kg; In step (2), the increment of the tension of the scraping roller is 20-60 kg; In step (3), when the scraping roller rotates counterclockwise, a cleaning tool is used that is set obliquely downward, and the cleaning tool and the axis of the scraping roller have an angle of 30-70 degrees, and the cleaning tool scrapes liquid and impurities from the bottom of the scraping roller upward; when the scraping roller rotates clockwise, a cleaning tool is used that is set obliquely upward, and the cleaning tool and the axis of the scraping roller have an angle of 30-70 degrees, and the cleaning tool scrapes liquid and impurities from the top of the scraping roller downward; In step (2), in the diaphragm transmission system, the roller temperature of the temperature control roller is set between 25-35° C., and the roller speed ratio of the temperature control roller is between 0.999-0.

102.

10. A diaphragm obtained by the post-extraction scraping and cleaning method for a lithium battery diaphragm according to claim 8.

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