Battery pole piece cleaning device and battery pole piece cleaning method

Abstract

The invention relates to the technical field of battery pole piece cleaning, in particular to a battery pole piece cleaning device, a battery pole piece comprises a current collector and a coating layer attached to the surface of the current collector, the battery pole piece cleaning device comprises a suction nozzle, the suction nozzle is provided with a cavity, the cavity is defined by a side plate and a scraper, and a material suction opening and a spraying opening are formed in the cavity. Scraping and sucking of the scraper are carried out at the same time through one suction nozzle, the force of the scraper can be reduced with the assistance of suction force, the foil is not prone to being scratched, scraping is carried out while sucking is carried out, the sucking efficiency can be improved, the affected area of sucking is easy to control, and meanwhile the defects of scraping and sucking are overcome. In addition, the invention further discloses a battery pole piece cleaning method comprising the battery pole piece cleaning device.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pole piece cleaning, and in particular to a battery pole piece cleaning device and a battery pole piece cleaning method. Background Art

[0002] Lithium-ion batteries have been increasingly widely used in mobile phones, computers, tablets, Bluetooth headsets, power tools, automobiles, energy storage and other fields. People have higher requirements for the charging time of lithium-ion batteries. At present, the center-mounted tab structure is widely used to improve the fast charging performance of batteries. The center-mounted tab is to form an empty foil area at a certain position between the positive and negative electrodes in a certain way, and weld the tab in the empty foil area.

[0003] The existing technologies for forming the empty foil area mainly include the following methods: 1. Laser cleaning process: coating, roller slitting, laser cleaning and paste coating are performed in sequence to obtain the pole piece placed in the middle of the pole ear; however, in the laser cleaning process, the efficiency of the laser cleaning machine is low and the cost of use is high. Secondly, there are many quality abnormalities during the laser cleaning process, and problems such as unclean slot cleaning or light transmission in the slot cleaning often occur. These problems often lead to poor pole ear welding in the winding process; 2. Mechanical scraping and cleaning method: it uses a metal scraper to directly contact the collector surface, which has certain production risks. Moreover, when the gap between the scraper and the battery pole piece is too large, paint residue and unclean cleaning will occur. When the gap between the scraper and the battery pole piece is too small, the battery collector will be scratched or even broken; 3. Foam glue process: pre-pasting foam glue, coating, and removing the paste at the foam glue are performed in sequence to obtain the pole piece placed in the middle of the pole ear, but in the foam glue process, the conventional peeling of the adhesive tape has certain difficulties, and it will also cause certain damage to the metal foil surface, or there will be waste of slurry.

[0004] Based on this, there is an urgent need to invent a battery pole piece cleaning device and a battery pole piece cleaning method to solve the above-mentioned technical problems. Summary of the invention

[0005] One of the purposes of the present invention is to provide a battery pole piece cleaning device to address the deficiencies of the prior art. The cleaning device can achieve rapid cleaning of the pole piece and the cleaning process is not likely to damage the current collector and will not generate pollution during the cleaning process.

[0006] In order to solve the above technical problems, this application adopts the following technical solutions:

[0007] A battery pole piece cleaning device is provided, which is suitable for cleaning battery pole pieces. The battery pole pieces include a current collector and a coating layer attached to the surface of the current collector, and include a suction nozzle. The suction nozzle has a cavity, and the cavity is surrounded by a side plate and a scraper. A suction port and a spray port are arranged in the cavity.

[0008] Specifically, the suction nozzle further includes a top plate, the side plate and the scraper are arranged on the periphery of the top plate to form the cavity, and the side plate and the scraper are in contact with the current collector to seal the cavity.

[0009] Specifically, the side plate includes a first side plate located on both sides of the scraper and a second side plate opposite to the scraper, the height of the second side plate is smaller than that of the scraper, and the difference in height between the scraper and the second side plate is greater than the height of the coating layer and less than 2 times the height of the coating layer.

[0010] Specifically, the spraying port is arranged on the second side plate, and the scraper is located opposite to the spraying port.

[0011] Specifically, the blade of the scraper is perpendicular to the pole piece.

[0012] Specifically, a roller is arranged below the suction nozzle.

[0013] Specifically, it also includes a transverse adjustment mechanism and a longitudinal adjustment mechanism. The longitudinal adjustment mechanism is connected to the suction nozzle and is used to adjust the suction nozzle to move up and down. The transverse adjustment mechanism is connected to the longitudinal adjustment mechanism and is used to adjust the suction nozzle to move left and right.

[0014] Specifically, the suction port is connected to the suction pipe, and the spray port is connected to the spray pipe.

[0015] The beneficial effects of the present invention are as follows: scraping and sucking materials with a scraper can be performed simultaneously through a suction nozzle, the suction force can be used to reduce the scraper force, and the foil is not easily scratched. Scraping while sucking materials can improve the suction efficiency. The cavity setting makes it easy to control the affected area of ​​suction to prevent the suction from affecting nearby coatings. At the same time, the shortcomings of scraping and sucking materials are overcome, and no pollution is generated during the cleaning process.

[0016] The second object of the present invention is to provide a battery pole piece cleaning method, characterized in that the above-mentioned battery pole piece cleaning device is used to remove the coating material in the predetermined removal area of ​​the pole piece, comprising the following steps:

[0017] Step 1: The longitudinal adjustment mechanism drives the suction nozzle to press down, and the suction nozzle is pressed into the coating layer to the current collector at a preset pressure, and the cavity of the suction nozzle covers part of the predetermined removal area and forms a seal.

[0018] Step 2: The pole piece moves forward and the scraper scrapes up the coated material. At the same time, the diluent is sprayed out from the spray port, and negative pressure is formed at the suction port to suck the material.

[0019] Step three: After the suction nozzle passes through the predetermined material removal area, the longitudinal adjustment mechanism drives the suction nozzle to rise, and at the same time stops the suction port from sucking material and the spray port from spraying diluent.

[0020] Specifically, the diluent is water or NMP. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 This is one of the structural schematic diagrams of Example 1 of the present invention;

[0023] Figure 2 is a cross-sectional view of Example 1 of the present invention;

[0024] Figure 3 This is the second structural diagram of Example 1 of the present invention;

[0025] Figure 4 This is a diagram of the empty foil area of ​​the pole piece in the present invention.

[0026] Wherein: 1-suction nozzle; 11-cavity; 111-side plate; 1111-first side plate; 1112-second side plate; 112-scraper; 113-suction port; 1131-suction pipe; 114-spraying port; 1141-spraying pipe; 115-top plate; 2-lateral adjustment mechanism; 3-longitudinal adjustment mechanism;

[0027] 1'-coating layer; 2'-empty foil area; 3'-current collector. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings, but this is not intended to limit the present invention.

[0030] like Figure 4As shown, lithium-ion batteries have been increasingly widely used in mobile phones, computers, tablets, Bluetooth headsets, power tools, automobiles, energy storage and other fields. People have higher requirements for the charging time of lithium-ion batteries. The electrons in the battery pole pieces need to pass through the pole ears for charging and discharging. Therefore, the transmission paths of electrons at different positions are different. In order to reduce the transmission paths of electrons, the center pole ear structure is currently widely used to improve the fast charging performance of the battery cell. The center pole ear is formed by a certain method at a certain position between the positive and negative pole pieces to form an empty foil area 2', and the pole ear is welded in the empty foil area 2'.

[0031] The applicant has found that the following methods are mainly used to form the empty foil area 2' in the existing technology: laser cleaning process: coating, roller cutting, laser cleaning paste, to obtain the empty foil area 2'; mechanical scraping cleaning method: using a metal scraper to directly contact the surface of the current collector 3', scraping the paste to obtain the empty foil area 2'; foam glue process: pre-pasting foam glue, coating, and removing the paste at the foam glue to obtain the empty foil area 2', among which the mechanical scraping cleaning method is the most commonly used method, which has the advantages of low cost, simplicity, and no pollution. However, the mechanical scraping cleaning method uses a scraper to directly contact the battery pole piece. When the gap between the scraper and the battery pole piece is too large, paint residue will be generated, and the problem of unclean cleaning will occur. When the gap between the scraper and the battery pole piece is too small, the battery current collector 3' will be scratched or even broken. In addition, the slurry on both sides of the scraper is piled up due to extrusion, resulting in uneven thickness of the plate.

[0032] For this reason, the prior art generally provides a larger gap between the scraper and the battery pole piece so that paint will remain after scraping with the scraper, and then uses a wiping device to wipe the remaining paint, thereby ensuring that no paint remains in the pole piece.

[0033] However, in actual use, there may be larger particles in the residual coating. Removing the residual coating by wiping may cause friction between the coating particles and the current collector 3', resulting in scratches on the current collector 3', or even the coating particles scratching the current collector 3'. It is difficult to control the wiping force when using the wiping method, especially at the edge of the empty foil area 2', it is more likely to cause uneven force due to the deformation of the current collector 3' during wiping, resulting in poor wiping effect at the edge of the empty foil area 2'.

[0034] like Figure 1As shown, the present application simultaneously scrapes and sucks the coating layer 1' on the pole piece. The airflow or air pressure generated during the scraping and sucking process can help remove the residual coating and reduce the direct contact between the scraper and the battery pole piece. During scraping, the gap between the scraper and the current collector 3' can be cleaned by airflow to ensure that the coating is completely cleaned after the scraper passes. By cleaning the residual coating by sucking, the coating cleaning process will not damage the current collector 3', and the coating scraped by the scraper can be cleaned away in time, which can prevent the accumulation of coating from causing uneven thickness of the pole piece coating. Figure 1 As shown, the present application simultaneously scrapes and absorbs the paint on the pole piece. The airflow or air pressure generated during the suction process when the scraper 112 is scraping can help remove the residual paint and reduce the direct contact between the scraper 112 and the battery pole piece. When scraping, the gap between the scraper 112 and the current collector 3' can be cleaned by the airflow to clean the paint in the gap, ensuring that the paint can be completely cleaned after the scraper 112 passes. By cleaning the residual paint by suction, the current collector 3' will not be damaged during the paint cleaning process, and the paint scraped out by the scraper 112 can be cleaned away in time, which can prevent the accumulation of paint from causing uneven thickness of the pole piece paint.

[0035] Example 1

[0036] like Figure 1-4 As shown, a battery pole piece cleaning device comprises a suction nozzle 1, which contacts with the battery pole piece to clean the paint layer 1' of the pole piece to form an empty foil area 2', the suction nozzle 1 has a cavity 11 with an open end, and the cavity 11 is surrounded by a side plate 111 and a scraper 112. When the suction nozzle 1 is used to clean the paint layer 1' of the pole piece, the open end is downward to cover the preset part of the paint layer 1' to be cleaned, wherein the side plate 111 is used to provide support, and the scraper 112 is used to scrape the paint layer 1', and a suction port 113 and a spray port 114 are provided in the cavity 11, the suction port 113 is connected to the vacuum generator outside the suction nozzle 1 to suck away the scraped paint, and the spray port 114 is connected to the liquid replenishing tank to spray a diluent, which can dilute the paint to increase the fluidity of the paint and facilitate the scraping and suction of the paint.

[0037] Specifically, the suction nozzle 1 also includes a top plate 115, a side plate 111 and a scraper 112 are arranged on the periphery of the top plate 115 to form a cavity 11, and the side plate 111 and the scraper 112 are in contact with the current collector 3' to seal the cavity 11. When the side plate 111 and the scraper 112 move downward to contact the current collector 3', the opening of the cavity 11 is blocked by the current collector 3' to seal the cavity 11. Through this sealing, the paint layer 1' in the preset cleaning area and the paint layer 1' that does not need to be cleaned can be isolated, the sprayed diluent can only act on the paint in the cavity 11, and the suction port 113 can only act on the paint layer 1' in the cavity 11 to suck away the paint, effectively isolating the paint layer 1' that needs to be cleaned from the area that does not need to be cleaned, so that the spraying and suction process accurately acts on the preset cleaning area, thereby improving the accuracy of suction.

[0038] Preferably, the side plate 111 includes a first side plate 1111 located on both sides of the scraper 112 and a second side plate 1112 opposite to the scraper 112, the height of the second side plate 1112 is smaller than the scraper 112, and the difference in height between the scraper 112 and the second side plate 1112 is greater than the height of the coating layer 1' and less than 2 times the height of the coating layer 1'. In order to ensure the suction capacity of the suction nozzle 1, it is necessary to ensure that the cavity 11 can be sealed when the coating of the electrode is sucked in order to maintain a good suction force, and in order to ensure the scraping capacity of the scraper, it is necessary to leave a gap for the coating to enter the scraper for scraping the coating, and in order to ensure the sealing performance and leave a gap for the coating to enter, the difference in height of the scraper 112 and the second side plate 1112 is set to be greater than the height of the coating layer 1' and less than 2 times the height of the coating layer 1'. Within this range, the gap left by the second side plate 1112 will not be too small to cause the coating to be unable to enter or be squeezed when entering, nor will it be too large to cause the sealing performance in the cavity 11 to decrease, thereby weakening the suction capacity. In order to ensure that the paint at the preset position on the pole piece can be effectively cleaned by the scraper 112, it is necessary to comprehensively consider the layout between the scraper 112 and the side plate 111, and set the first side plate 1111 on both sides of the scraping area of ​​the scraper 112 to prevent the paint scraped by the scraper 112 from accumulating, and set the second side plate 1112 at a position opposite to the scraper 112, and the width of the second side plate 1112 is the same as the width of the scraper 112, so that the width of the paint entering the cavity 11 is the same as the width of the scraper 112, so that the paint entering the cavity 11 can be evenly removed under the action of the scraper 112.

[0039] Preferably, the spray port 114 is arranged on the second side plate 1112, and the scraper 112 is relative to the spray port 114. The position setting of the spray port 114 is related to the dilution effect of the thinner on the paint. When the scraper 112 and the spray port 114 are relatively arranged, the thinner can be directly sprayed on the scraper 112 to dilute the paint on the scraper 112 in time, ensure the cleaning of the scraper 112 in time to prevent the paint from accumulating on the scraper 112, and ensure the stable operation of the suction effect of the suction port 113 at the blade edge. When the scraper 112 is scraping, the airflow is stably transmitted in the gap between the scraper 112 and the current collector 3', and the airflow plays an auxiliary role in cleaning the paint.

[0040] When the spray port 114 is set at a relative position to the scraper 112, the suction port 113 is preferably set on the first side plate 1111. This arrangement is conducive to a more reasonable flow direction of the diluent, so that the diluent moves to the suction port 113 after being sprayed onto the paint for dilution, thereby improving the dilution efficiency of the diluent.

[0041] Preferably, the blade of the scraper 112 is perpendicular to the pole piece, which helps to better adjust the pressure of the scraper 112 on the current collector 3' and make the scraper 112 cut the coating layer 1' more smooth so that lithium is not easily deposited at the edge of the empty foil area 2'.

[0042] Preferably, a roller is provided under the suction nozzle 1. The function of the roller is to provide support, so that the pressure between the scraper 112 and the current collector 3' can be controlled by controlling the downward pressure of the cylinder to control the scraping effect. In order to avoid damage to the surface of the foil by the hard roller during the production process, the roller is preferably made of soft material, and the soft material of the roller can disperse the pressure of the scraper 112, alleviate the problem of uneven pressure, ensure the uniform distribution of the coating and better coating quality. Because the positive electrode material is corrosive, the roller is preferably made of corrosion-resistant EPDM rubber or polyvinyl chloride rubber. More preferably, the scraper 112 is made of Teflon material. The Teflon scraper 112 has excellent chemical resistance and low friction properties, reducing the adhesion of the coating.

[0043] Preferably, it also includes a transverse adjustment mechanism 2 and a longitudinal adjustment mechanism. The longitudinal adjustment mechanism is connected to the suction nozzle 1 and is used to adjust the suction nozzle 1 to move up and down. The transverse adjustment mechanism 2 is connected to the longitudinal adjustment mechanism and is used to adjust the suction nozzle 1 to move left and right. The transverse adjustment mechanism 2 and the longitudinal adjustment mechanism can be set as a transverse adjustment cylinder and a longitudinal adjustment cylinder. The setting provides precise control so that the suction nozzle 1 can be adjusted in multiple directions to adapt to different operating requirements.

[0044] Preferably, the suction port 113 is connected to the suction pipe 1131 to transmit the material to the collecting device, which helps to effectively collect materials and reuse the collected paint. The spray port 114 is connected to the spray pipe 1141 to accurately spray the paint.

[0045] Example 2

[0046] A battery pole piece cleaning method, using the above-mentioned battery pole piece cleaning device to remove the coating material in the predetermined removal area of ​​the pole piece, comprises the following steps:

[0047] Step 1: Apply the coating on the current collector 3', and then move the current collector 3' coated with the coating to the battery pole cleaning device and keep moving.

[0048] Step 2: Use photoelectric signals to sense the pole piece head, and calculate the distance between the pole piece head and the predetermined material removal area through the encoder. When the pole piece is calculated to move to the set position, the longitudinal adjustment mechanism is lowered by the high-speed solenoid valve to drive the suction nozzle 1 downward. The suction nozzle 1 is pressed into the coating layer 1' to the current collector 3' at a preset pressure, and the cavity 11 of the suction nozzle 1 covers part of the predetermined material removal area and forms a seal.

[0049] Step 3: The pole piece moves forward and the scraper 112 scrapes up the coating material. At the same time, the spray port 114 sprays out the diluent, and a negative pressure is formed at the suction port 113 to suck the material.

[0050] Step 4: The encoder calculates the slot width. When the suction nozzle 1 passes through the predetermined material removal area, the high-speed solenoid valve causes the longitudinal adjustment mechanism to drive the suction nozzle 1 to rise, and at the same time stops the suction port 113 from sucking materials and the spray port 114 from spraying diluent.

[0051] The above steps are repeated sequentially to form a pole piece having an empty foil area 2'.

[0052] Preferably, the diluent is water or NMP, which can evaporate in the subsequent drying process of the electrode to prevent the electrode from being affected, and the recovered coating can be reused through simple treatment.

[0053] Preferably, the moving speed of the pole piece is in the range of 0.1 m / s-0.4 m / s, the vacuum degree of the negative pressure is in the range of 50-200 kPa, and the flow rate of the diluent is in the range of 5 ml / s-20 ml / s.

[0054] Example 3

[0055] Prepare coating: Mix active material, binder and conductive agent into a homogeneous slurry.

[0056] Coating: The coating is evenly coated on the current collector 3', and the surface density of the coating layer 1' is 14 mg / cm 2 .

[0057] Cleaning the empty foil area 2': Start the battery pole piece cleaning device, according to the thickness of the current collector 3', control the cylinder to descend so that the distance between the roller and the suction nozzle is equal to the thickness of the current collector 3', and control the pole piece moving speed to 0.25m / s, the vacuum degree to 100kPa, and the diluent flow rate to 10ml / s, and clean the pole piece in the predetermined area. After the pole piece is cleaned, the pole piece with an empty foil area 2' is obtained. Figure 4 shown.

[0058] Comparative Example 1

[0059] The difference from the third embodiment is that a laser cleaning device is used to clean the pole piece in a predetermined area.

[0060] The other steps are the same as those in Example 3 and will not be described again here.

[0061] Comparative Example 2

[0062] The difference from the third embodiment is that a scraper cleaning machine (the scraper cleaning machine only cleans with a scraper) is used to clean the electrode in a predetermined area.

[0063] The other steps are the same as those in Example 3 and will not be described again here.

[0064] Comparative Example 3

[0065] The difference from the third embodiment is that a suction cleaning device is used (the scraper cleaning machine only cleans by suction) to clean the electrode in the predetermined area.

[0066] The other steps are the same as those in Example 3 and will not be described again here.

[0067] Current collector surface damage test

[0068] The coating residue in the predetermined area of ​​the current collector 3' and the damage of the current collector 3' were observed using a 50x microscope.

[0069] Cleaning empty foil area speed test

[0070] Clean the empty foil area 2' of the same size, and record the time taken from the start of cleaning the empty foil area 2' to the completion of cleaning the empty foil area. Repeat the test 10 times and take the average value of the time taken.

[0071] The test results are shown in Table 1

[0072] Table 1

[0073] Paint residue Current collector damage Time(s) Example 3 none none 0.08 Comparative Example 1 Small amount none 1 Comparative Example 2 Small amount obvious 0.08 Comparative Example 3 none none 2

[0074] It can be seen from Example 3 and Comparative Examples 1-3 that after cleaning the pole piece, the battery pole piece cleaning device of the present application leaves no coating residue on the pole piece empty foil area 2 ′ and no current collector 3 ′ damage, and the cleaning time is short.

[0075] The above description shows and describes several preferred embodiments of the present invention, but as before, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept of this article through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A battery pole piece cleaning device, suitable for cleaning a battery pole piece, wherein the battery pole piece comprises a current collector and a coating layer attached to the surface of the current collector, characterized in that: The invention comprises a suction nozzle (1), wherein the suction nozzle (1) has a cavity (11), wherein the cavity (11) is surrounded by a side plate (111) and a scraper (112), and a suction port (113) and a spray port (114) are arranged in the cavity (11).

2. The battery pole cleaning device according to claim 1, characterized in that: The suction nozzle (1) further comprises a top plate (115), the side plate (111) and the scraper (112) are arranged on the periphery of the top plate (115) to form the cavity (11), and the side plate (111) and the scraper (112) are in contact with the current collector to seal the cavity (11).

3. The battery pole cleaning device according to claim 2, characterized in that: The side plate (111) comprises a first side plate (1111) located on both sides of the scraper (112) and a second side plate (1112) opposite to the scraper (112), the height of the second side plate (1112) being smaller than that of the scraper (112), and the difference between the height of the scraper (112) and the second side plate (1112) being greater than the height of the coating layer and less than twice the height of the coating layer.

4. The battery pole cleaning device according to claim 3, characterized in that: The spraying port (114) is arranged on the second side plate (1112), and the scraper (112) is located opposite to the spraying port (114).

5. The battery pole cleaning device according to claim 1, characterized in that: The blade of the scraper (112) is perpendicular to the pole piece.

6. The battery pole cleaning device according to claim 1, characterized in that: A supporting roller is arranged below the suction nozzle (1).

7. The battery pole cleaning device according to claim 1, characterized in that: It also comprises a transverse adjustment mechanism (2) and a longitudinal adjustment mechanism (3); the longitudinal adjustment mechanism (3) is connected to the suction nozzle (1) and is used to adjust the suction nozzle (1) to move up and down; the transverse adjustment mechanism (2) is connected to the longitudinal adjustment mechanism (3) and is used to adjust the suction nozzle (1) to move left and right.

8. The battery pole cleaning device according to claim 1, characterized in that: The suction port (113) is connected to a suction pipe (1131), and the spray port (114) is connected to a spray pipe (1141).

9. A battery pole cleaning method, characterized in that: The battery pole piece cleaning device according to any one of claims 1 to 8 is used to remove the coating material in the predetermined removal area of ​​the pole piece, comprising the following steps: Step 1: The longitudinal adjustment mechanism (3) drives the suction nozzle (1) to press downward, and the suction nozzle (1) is pressed into the coating layer to the current collector at a preset pressure, and the cavity (11) of the suction nozzle (1) covers a portion of the predetermined removal area and forms a seal; Step 2: The pole piece moves forward and the scraper (112) scrapes up the coated material. At the same time, the spray port (114) sprays out the diluent, and a negative pressure is formed at the suction port (113) to suck the material. Step three: After the suction nozzle (1) passes through the predetermined material removal area, the longitudinal adjustment mechanism (3) drives the suction nozzle (1) to rise, and simultaneously stops the suction port (113) from sucking material and the spray port (114) from spraying diluent.

10. The battery pole piece cleaning method according to claim 9, characterized in that: The diluent is water or NMP.

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