Apparatus for Removing Coating Material for Battery Plate and Method for Removing Coating Material for Battery Plate

Abstract

Disclosed is an apparatus and method for removing a coating material from a battery plate, the battery plate including a current collector and a coating material attached to a surface of the current collector. The apparatus includes a positioning member, a spray port, and a suction port, the positioning member includes a side plate that surrounds and forms a hollow space and contacts the current collector to isolate the coating material from the predetermined area within the hollow space, the spray port is located within the hollow space and communicates with a liquid source to spray a liquid onto the coating material from the predetermined area, and the suction port is located within the hollow space and communicates with a vacuum generator to suck the coating material from the current collector.

Description

Technical Field

[0001] This application claims the priority of Chinese Patent Application No. 202110744365.5, titled "Apparatus for Removing Coating Material for Battery Electrode Plate and Method for Removing Coating Material for Battery Electrode Plate", filed with the China National Intellectual Property Administration on July 1, 2021, and all of its contents are incorporated herein by reference.

[0002] This application relates to the manufacture of battery electrode plates, and more particularly, to an apparatus for removing coating material for battery electrode plates and a method for removing coating material for battery electrode plates.

Background Art

[0003] With the wide application of lithium-ion batteries, research on the optimization of the performance of lithium-ion batteries has also attracted attention. Improving the energy density of lithium-ion batteries has always been the focus of people's attention. To improve the energy density of lithium-ion batteries, it is possible to start from the inherent properties of the battery materials themselves, and it is also possible to start from the perspective of the structure of lithium-ion batteries. In order to improve the energy density of lithium-ion batteries and reduce the internal impedance of the battery due to the battery structure, the position of the tab on the battery electrode plate in the lithium-ion battery has begun to change from the installation position at the end of the early electrode plate to the central position of the electrode plate, that is, the coating material area of the battery electrode plate. The change in the position of the tab means a change in the manufacturing method of the battery electrode plate. The tab is located in the coating material area of the battery electrode plate. When there is an electrode coating layer, the tab cannot be welded to the current collector of the electrode. Therefore, it is necessary to first remove the coating material corresponding to the tab in the coating material area. Currently, the commonly used methods for removing the coating material include mechanical scraping cleaning method, chemical cleaning method and laser cleaning method. Regarding the mechanical scraping cleaning method, since the metal scraper is directly in contact with the surface of the current collector, there is not only a certain production risk, but also a problem that if the gap between the scraper and the battery electrode plate is too large, the coating material will remain and cannot be completely cleaned. If the gap between the scraper and the battery electrode plate is too small, the current collector of the battery may be damaged or cut, and the adhesion of the powder generated during scraping to the battery electrode plate will also increase the defective rate of the manufacture of the battery electrode plate. Regarding the chemical cleaning method, there are problems such as causing certain pollution to the environment, having a bad working environment and low production efficiency. Regarding the laser cleaning method, since the laser energy distribution is non-uniform, the battery electrode plate is easily damaged, and the surface of the electrode plate is easily oxidized, resulting in a decrease in strength. Therefore, it is necessary to remove the coating material in a specific area of the battery electrode plate by a more preferable method. Summary of the Invention

[0004] In order to solve the technical problem that there are various drawbacks in the method for removing the coating material of the battery electrode plate in the prior art, the present application provides a coating material removing device for a battery electrode plate and a method for removing the coating material for a battery electrode plate. By using the coating material removing device for a battery electrode plate to remove the material, the coating material at the position where it is necessary to weld the tab on the battery electrode plate can be efficiently and effectively removed, and the degree of damage to the current collector and the residue of the coating material on the current collector after removing the material can be significantly reduced.

[0005] To achieve the above object, according to a first aspect, in the coating material removing device for a battery electrode plate according to the present application, the battery electrode plate includes a current collector and a coating material attached to the surface of the current collector, and the coating material removing device for a battery electrode plate removes the coating material in a predetermined area of the battery electrode plate and includes a positioning member, a spray port, and a suction port. The positioning member is formed to surround a hollow space and includes side plates that contact the current collector to isolate the coating material in the predetermined area into the hollow space. The spray port is located in the hollow space and communicates with a liquid source to spray a liquid that increases the fluidity of the coating material in the predetermined area onto the coating material in the predetermined area. The suction port is located in the hollow space and communicates with a vacuum generating device to suck the coating material in the predetermined area from the current collector.

[0006] In an embodiment of the present application, the positioning member further includes a top plate, the side plates are installed at the periphery of the top plate, and contact the current collector to seal the hollow space.

[0007] In an embodiment of the present application, the suction port has a suction port surface surrounding a passage communicating with the hollow space, and at least a part of the suction port surface is trumpet-shaped opening towards the hollow space.

[0008] In an embodiment of the present application, the side plates include an inner side plate and an outer side plate, the inner side plate and the outer side plate are installed spaced apart to form a suction pipeline, the suction pipeline communicates with the suction port, and one end of the outer side plate close to the battery electrode plate contacts the current collector.

[0009] In one embodiment of the present application, the side plates include an inner plate and an outer plate, the top plate includes an inner top plate and an outer top plate, the inner plate and the inner top plate are connected to form the inner wall of the suction pipe, the outer plate and the outer top plate are connected to form the outer wall of the suction pipe, the suction pipe communicates with the suction port, and one end of the outer plate adjacent to the battery plate contacts the current collector to seal the hollow space.

[0010] In one embodiment of the present application, the suction port is formed at one end of the suction line adjacent to the battery plate.

[0011] In one embodiment of the present application, one end of the inner plate adjacent to the battery plate contacts the surface of the coating material in the predetermined area away from the surface of the current collector.

[0012] In one embodiment of the present application, a main spray conduit is installed inside the top plate, and the main spray conduit forms the spray port on the side of the top plate that is close to the battery plate, and the spray port communicates with a liquid source via the main spray conduit to spray the liquid onto the coating material in the predetermined area.

[0013] In one embodiment of the present application, the battery plate coating material removal device further includes a spray plate, which is installed in the hollow space and has a plurality of spray pipes communicating with the main spray pipe, and the spray ports are formed on the sides of the plurality of spray pipes away from the main spray pipe.

[0014] According to the above technical means, the coating material removing device for battery electrode plates of the present application can accurately remove the coating material in a predetermined area on the battery electrode plate for welding tabs. The positioning member included in this device can lock a predetermined area where the coating material needs to be removed. When the side plate of the positioning member contacts the current collector, it can separate the predetermined area where the coating material needs to be removed from the non-predetermined area where the coating material does not need to be removed, so that when removing the coating material from the predetermined area, it will not affect the coating material in the non-predetermined area, improving the accuracy of coating material removal. Also, the coating material removing device for battery electrode plates further includes a spray port, which communicates with a liquid source and sprays liquid into a predetermined area isolated by the positioning member to reduce the viscosity of the coating material in the predetermined area, which is beneficial for the absorption of the coating material in this area. Furthermore, the coating material removing device for battery electrode plates further includes a suction port, which can suck the coating material in a predetermined area with low viscosity from the current collector. Since the method of sucking the coating material is used, compared with the mechanical scraping cleaning method, chemical cleaning method and laser cleaning method in the prior art, the method of sucking can greatly reduce the damage to the battery electrode plate, reduce the residue of the coating material on the current collector, and further improve the yield of welding the tab to the current collector. Moreover, the coating material removing device for battery electrode plates according to the present application integrates a positioning member with the functions of positioning and isolation, a spray port with the function of spraying liquid, and a suction port with the function of sucking the coating material, so that the coating material in a predetermined area of the battery electrode plate can be conveniently, quickly and efficiently removed, improving the production efficiency of the battery electrode plate.

[0015] According to a second aspect, the method for removing the coating material for battery electrode plates according to the present application uses the above coating material removing device for battery electrode plates to remove the coating material in a predetermined area of the battery electrode plate. A step of isolating the coating material in the predetermined area into the hollow space by arranging the positioning member on the battery electrode plate so that the side plate contacts the current collector. A step of ejecting liquid from a spray port in the hollow space to infiltrate the coating material in the predetermined area. and sucking the infiltrated coating material from the predetermined area through the suction port from the current collector.

[0016] In one embodiment of the present application, after the infiltrated coating material in the predetermined area is sucked from the current collector through the suction port, the method further includes the steps of spraying a liquid onto the current collector from which the coating material has been sucked, and sucking the liquid from the current collector through the suction port.

[0017] In one embodiment of the present application, after spraying the liquid onto the current collector to which the coating material has been suctioned and suctioning the liquid from the current collector through the suction port, the method further includes a step of performing a drying treatment on the battery plate.

[0018] In one embodiment of the present application, the standard for spraying the liquid is to spray 1 to 3 g of liquid onto a given area per square centimeter.

[0019] In one embodiment of the present application, a vacuum generator is connected to the suction port, and the vacuum level of the vacuum generator is 50 to 300 kPa.

[0020] The above-mentioned method for removing coating material from a battery plate can conveniently and effectively remove the coating material at the position where the tab needs to be installed, which is advantageous for welding the tab to the current collector and improves the yield of the tab welding.

[0021] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief description of the drawings]

[0022]

Fig. 1-1

Fig. 1-2

Fig. 2

Fig. 3

Fig. 4

Fig. 5

DETAILED DESCRIPTION OF THE INVENTION

[0023] In order to more clearly illustrate the technical problems, technical means, and beneficial effects to be solved by the present application, the present application will be described in more detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described in this specification are only for interpreting the present application and do not limit the present application.

[0024] A lithium-ion battery includes a battery electrode plate. The battery electrode plate 1 includes a current collector 11, a coating material 12 attached to the surface of the current collector 11, and a tab 13 welded to the current collector 11. Usually, as shown in FIG. 1-1, the end of the current collector 11 is a blank current collector used for welding the tab 13, and the other part is used for coating the coating material 12. When the lithium-ion battery discharges, taking the negative electrode plate as an example, electrons are transmitted to the external circuit through the current collector 11 and the electrode tab 13. However, since the path for electrons to be transmitted to the external circuit for the coating material at one end away from the tab 13 is long, some heat is generated in the process of electron transmission, causing a loss of battery capacity and being disadvantageous for improving the energy density of the battery. Therefore, in order to solve this problem, the position of the tab 13 on the battery electrode plate 1 can be changed. As shown in FIG. 1-2, by moving the position of the tab 13 from the end of the current collector 11 to the central part of the current collector 11 or a position close to the central part of the current collector 11, the path for transmitting electrons between the battery electrode plate 1 and the external circuit is shortened, the loss of battery energy density due to electron transmission is reduced, which is advantageous for improving the battery energy density. Since the tab 13 cannot be directly welded to the coating material 12, it is necessary to remove the coating material 12 at the welding position of the tab, and thus the current collector 11 and the tab 13 can be welded by exposing the current collector 11.

[0025] Based on this, as shown in FIGS. 2, 3, and 4, the coating material removing device 100 for a battery electrode plate according to the present application can be used to remove the coating material 12 in a predetermined region 14 of the battery electrode plate, and the predetermined region 14 is a region for welding the tab 13. The coating material removing device 100 for a battery electrode plate includes a positioning member 2, a spray port 3, and a suction port 4. The positioning member 2 includes a side plate 21. The space formed by surrounding the side plate 21 is defined as a hollow space 22. When the coating material removing device for the battery electrode plate is used to remove the coating material in a predetermined region 14 of the battery electrode plate, it is necessary to bring the positioning member 2 into contact with the battery electrode plate 1. The side plate 21 contacts the current collector 11 to isolate the coating material in the predetermined region 14 into the hollow space 22. The side plate 21 contacting the current collector 11 means that the side plate 21 penetrates the coating material 12 and contacts the current collector 11. The spray port 3 is installed in the hollow space 22 and communicates with a liquid source to spray a liquid that increases the fluidity of the coating material in the predetermined region 14 onto the coating material in the predetermined region 14. The suction port 4 is installed in the hollow space 22 and communicates with a vacuum generating device to suck the coating material in the predetermined region 14 from the current collector 11.

[0026] As will be understood hereinafter, the coating material removing device for a battery electrode plate includes a positioning member 2. By contacting the current collector 11 with the side plate 21, the coating material that needs to be removed can be separated from the coating material that does not need to be removed. Based on this, the spray port communicating with the liquid source can spray liquid onto the coating material that needs to be removed. After the coating material is infiltrated by the liquid, its viscosity is reduced, its fluidity is improved, which is advantageous for suction. The spray port 3 is installed in the hollow space 22, and since the side plate 21 isolates the coating material that needs to be removed from the coating material that does not need to be removed, the sprayed liquid does not contact the area where the coating material does not need to be removed. That is, the coating material that does not need to be removed is not affected by the liquid. In this way, an accurate removal process can be performed on the coating material in the predetermined area 14 without affecting the coating material that does not need to be removed, thereby improving the accuracy of coating material removal. Also, the suction port 4 installed in the hollow space 22 only sucks the coating material in the predetermined area 14 isolated in the hollow space 22 from the current collector 11 and does not affect the coating material that does not need to be removed outside the hollow space 22, so it does not affect the subsequent use effect of the battery electrode plate 1.

[0027] In one embodiment, as shown in FIGS. 3 and 4, a suction pipeline 5 is installed inside the side plate 21. The side plate 21 includes an inner side plate 211 close to the hollow space 22 and an outer side plate 212 away from the hollow space 22. The suction port 4 has a suction port surface 42 surrounding a passage 41 communicating with the hollow space 22, and at least a part of the suction port surface 42 is trumpet-shaped opening towards the hollow space 22.

[0028] In one embodiment of the present application, the suction port 4 is located within the coating material 12, and the distance from the part of the suction port 4 away from the side plate 21 to the current collector 11 is greater than the distance from the part of the suction port 4 close to the side plate 21 to the current collector 11.

[0029] That is, the plane where the supply location of the suction port 4 is located is not parallel to the current collector 11, but forms a certain angle. Compared with the case where the supply location of the suction port is parallel to the current collector 11, such an installation can increase the supply amount at the supply location, that is, it is more advantageous for putting the coating material into the suction port.

[0030] As shown in FIGS. 3 and 4, in one embodiment of the present application, the positioning member 2 further includes a top plate 23. The side plate 21 is installed at the periphery of the top plate 23 to form a hollow space 22, and contacts the current collector 11 to seal the hollow space 22.

[0031] That is, the top plate 23 and the side plate 21 are formed to surround a hollow space 22 with one end open. When the side plate 21 contacts the current collector 11, the current collector 11 can seal this opening, and the coating material 12 in the predetermined area 14 is also isolated by this opening.

[0032] In one embodiment of the present application, a suction pipeline 5 is installed inside the side plate 21. The suction pipeline 5 forms a first discharge port on the side close to the battery electrode plate 1 of the side plate 21, and forms a second discharge port on the side away from the battery electrode plate 1 of the side plate. The first discharge port communicates with the suction port 4, and the second discharge port communicates with the vacuum generating device. Due to the action of the vacuum generating device, the coating material in the predetermined area 14 is sucked from the current collector 11 through the suction port 4 and the suction pipeline 5.

[0033] As shown in FIG. 4 , in one embodiment of the present application, a suction pipe 5 is installed inside a side panel 21, which includes an inner panel 211 close to the hollow space 22 and an outer panel 212 remote from the hollow space 22. The inner panel 211 and the outer panel 212 are installed at a distance from each other to form the suction pipe 5; that is, the inner panel 211 and the outer panel 212 are installed at a certain distance from each other, and the outer panel 212 surrounds and forms the hollow space 22. The inner panel 211 is installed within the hollow space 22 so as to surround the outer panel 212. A beam 213 is installed at one end of the inner panel 211 and the outer panel 212 remote from the battery plate 1, and the beam 213 connects the inner panel 211 and the outer panel 212. The space surrounded by the inner panel 211, the outer panel 212, and the beam 213 and open at both ends forms the suction pipe 5. The arrow in the suction pipe 5 in the figure indicates the direction in which the coating material is sucked.

[0034] Furthermore, the suction pipe 5 has a second outlet formed in the beam 213 that communicates with a vacuum generator, and a first outlet formed at one end of the suction pipe 5 that is close to the battery plate 1, i.e., at a position that can contact the coating material 12 on the inner plate 211, and the first outlet is the suction port 4.

[0035] Furthermore, one end of the inner plate 211 close to the battery plate 1 and one end of the outer plate 212 close to the battery plate 1 together form a suction port 4, and the opening of the suction pipe 5 surrounded by the inner plate 211, the outer plate 212 and the beam 213 becomes a second suction port, and one end of the outer plate 212 close to the battery plate 1 contacts the current collector 11 to isolate the coating material in the specified area 14 within the hollow space 22, and one end of the inner plate 211 close to the battery plate 1 contacts the surface of the coating material 12 in the specified area 14 away from the current collector.

[0036] That is, at one end of the side plate 21 close to the battery electrode plate 1, the outer side plate 212 and the inner side plate 211 are not flush. The outer side plate 212 protrudes more than the inner side plate 211. When positioning the coating material in the predetermined region 14 using the positioning member 2, the outer side plate 212 contacts the current collector 11 for positioning. Since the inner side plate 211 is short, it cannot contact the current collector 11 but can contact the coating material 12. It can not only contact the surface of the coating material layer away from the current collector 11 but also be inserted into the coating material layer to contact the coating material, and it only needs not to contact the current collector 11. Preferably, the inner side plate 211 contacts the surface of the coating material layer.

[0037] At one end of the side plate 21 close to the battery electrode plate 1, by forming the suction port 4 with a certain height difference between the inner side plate 211 and the outer side plate 212, the installation of the suction port 4 alone in the hollow space 22 can be avoided, the number of components can be reduced, and the structure of the device can be simplified. Also, the inner side plate 211 does not contact the current collector 11 but only contacts the coating material 12. In this way, the coating material can be effectively sucked from the surface of the current collector. By contacting the surface of the coating material 12, the inner side plate 211 can sufficiently increase the area of the suction port 4 and suck the coating material 12 efficiently and quickly. Further, the end face of the inner side plate 211 close to the battery electrode plate 1 is not parallel to the battery electrode plate 1. That is, one end of the end face of the inner side plate 211 close to the battery electrode plate 1 close to the outer side plate 212 is closer to the battery electrode plate 1 than the end away from the outer side plate 212, which can increase the supply amount, that is, it is more advantageous for putting the coating material into the suction port.

[0038] As shown in FIG. 3, in one embodiment of the present application, a suction pipeline 5 is installed in both the top plate 23 and the side plate 21. The suction pipeline 5 is composed of an inner wall and an outer wall. The side plate 21 includes an inner side plate 211 close to the hollow space 22 and an outer side plate 212 away from the hollow space 22. The top plate 23 includes an inner top plate 231 close to the hollow space 22 and an outer top plate 232 away from the hollow space 22. The inner side plate 211 and the inner top plate 231 are connected to form the inner wall of the suction pipeline 5, and the outer side plate 212 and the outer top plate 232 are connected to form the outer wall of the suction pipeline 5. The suction pipeline 5 and the suction port 4 communicate with a vacuum generator through the suction pipeline 5 to suck the coating material 12 in a predetermined area 14 from the current collector 11.

[0039] As shown in FIG. 3, in one embodiment of the present application, a spray main pipeline 6 is installed inside the top plate. The coating material removing device for battery electrodes further includes a spray plate 7. The spray plate 7 is installed in the hollow space 22, and a plurality of spray pipelines 8 communicating with the spray main pipeline 6 are installed inside. Spray ports 3 are formed on the side of the plurality of spray pipelines 8 away from the spray main pipeline 6. The spray ports 3 communicate with a liquid source through the spray main pipeline 6 and the plurality of spray pipelines 8 to spray liquid onto the coating material in a predetermined area 14.

[0040] Furthermore, the spray plate 7 faces the battery electrode plate 1, and the spray ports 3 are located on the surface of the spray plate 7 close to the battery electrode plate 1.

[0041] Furthermore, a plurality of spray ports 3 are installed on the spray plate 7.

[0042] That is, in this embodiment, the spray plate 7 is similar to a shower head in daily life. By having a plurality of spray ports 3, the spray efficiency can be improved. Also, most preferably, the spray plate 7 is installed parallel to the battery electrode plate 1, so that the liquid ejected from the spray plate 7 can be directly sprayed onto the coating material in the predetermined area 14, enabling all the coating materials 12 in the predetermined area 14 to quickly contact the sprayed liquid, and improving the infiltration efficiency of the coating material in the predetermined area 14.

[0043] As shown in FIG. 4, in one embodiment of the present application, a main spray pipeline 6 is installed inside the top plate 23. The main spray pipeline 6 forms a spray port 3 on the side close to the battery electrode plate 1 of the top plate 23. The spray port 3 communicates with a liquid source through the main spray pipeline 6 to spray liquid onto the coating material in a predetermined area 14.

[0044] In the present application, the side plate 21 contacts the current collector 11 of the battery electrode plate. The shape and dimensions of the area formed by the side plate 21 surrounded by the battery electrode plate 1 are determined based on the shape and dimensions of the area where the coating material of the battery electrode plate needs to be removed, which are designed in advance. In the prior art, the tab 13 welded to the current collector 11 is composed of a tab body and a tab film. A part of the tab body is welded to the current collector 11, and the other part protrudes from the current collector 11. Since the part of the tab body welded to the current collector 11 is usually rectangular, the shape of the area formed by the side plate 21 surrounded by the battery electrode plate 1 is rectangular, and the area of the formed surrounded area is larger than the area of the part of the tab body welded to the current collector.

[0045] In another aspect, as shown in FIG. 5, the method for removing the coating material for the battery electrode plate according to the present application uses the above device for removing the coating material for the battery electrode plate to remove the coating material in a predetermined area of the battery electrode plate. The method includes the following steps (1) to (4).

[0046] In step (1), the coating material removal area is positioned. As shown in FIG. 5(a), the positioning member 2 is arranged in a predetermined area 14 of the battery electrode plate 1, that is, the area where the coating material needs to be removed. By making the side plate 21 penetrate the coating material 12 and contact the current collector 11, the coating material in the predetermined area 14 can be isolated in the hollow space 22, that is, the side plate 21 surrounds the coating material in the predetermined area 14 in the hollow space 22.

[0047] The provision of the side plate 21 allows the predetermined region 14 to be isolated independently, thereby isolating the coating material that needs to be removed from the coating material that does not need to be removed, thereby preventing the coating material that needs to be removed from spilling over onto the coating material that does not need to be removed, resulting in the removal of the coating material that does not need to be removed and resulting in a failure in the production of the electrode plate. Therefore, the clever design and application of the side plate 21 improves the accuracy of removing the coating material in the predetermined region of the battery electrode plate, and improves the production yield of the battery electrode plate.

[0048] In step (2), the liquid is sprayed. As shown in FIG. 5(b), the spraying process needs to be started after positioning and isolating the coating material in the predetermined area 14. The spray nozzle 3 located in the hollow space 22 is connected to the liquid source, and the liquid is sprayed from the spray nozzle 3 into the hollow space 22 so that it can fully contact the coating material in the predetermined area 14. The arrow in the figure indicates the direction of the liquid spray.

[0049] In step (1), the side plate 21 isolates the coating material in the designated area 14, so that the liquid sprayed from the spray nozzle 3 does not come into contact with the coating material outside the designated area, and only the coating material in the designated area 14 comes into contact with the liquid, causing the liquid to permeate the coating material in the designated area 14, reducing the viscosity of the coating material and increasing the fluidity of the coating material in the designated area 14, making it easier to absorb and remove.

[0050] In step (3), the coating material is removed by suction. As shown in FIG. 5(c), after the liquid sprayed in step (2) has soaked the coating material in the designated area 14, the suction removal process can begin. A vacuum generator is connected to the suction port 4 located in the hollow space 22, and the coating material in the designated area 14 can be sucked through the suction port 4 under negative pressure. The arrow in the figure indicates the suction direction of the coating material.

[0051] Due to the presence of the side plate 21 and the fact that only the coating material in the specified area 14 is infiltrated with the liquid, fluidity is improved, so that when the suction port 4 sucks the material, it sucks in only the coating material in the specified area 14, and the coating material outside the specified area is not affected.

[0052] To ensure that the coating material in the predetermined area is completely removed, as shown in (d) of FIG. 5, after removing the coating material in the predetermined area in step (3), step (4) may be performed to clean the predetermined area 14. That is, after completing step (3), the spraying process is started again to distribute the liquid sprayed from the spray nozzle 3 onto the current collector 11 in the predetermined area 14, and the suction process is started to suck up the liquid on the current collector 11 in the predetermined area 14, thereby cleaning the predetermined area 14. The arrows indicate the direction of liquid spraying and the direction of liquid suction.

[0053] After cleaning in step (4), the coating material in the predetermined area 14 can be completely removed, so that the surface of the current collector in the predetermined area is sufficiently clean for easy welding of the tab.

[0054] Furthermore, in step (2), the standard for spraying the liquid is to spray 1 to 3 g of liquid onto a predetermined area per square centimeter.

[0055] Furthermore, in step (3), the degree of vacuum of the vacuum generating device is 50 to 300 kPa.

[0056] Furthermore, in step (4), the standard for spraying the liquid is to spray 1 to 3 g of liquid onto a predetermined area per square centimeter, and the vacuum level of the vacuum generator is 50 to 300 kPa.

[0057] Furthermore, in step (1), the battery plate 1 is a battery plate on whose surface the coating material is not dried. The coating material that is not dried is easily soaked in and absorbed by the liquid sprayed from the spray nozzle.

[0058] Furthermore, after the above operation, the battery plate may be subjected to a drying treatment.

[0059] Furthermore, the liquid is an organic solvent, and the organic solvent is at least one selected from ester solvents and ether solvents. The ester solvent is at least one selected from ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethyl acetate, methyl acetate, ethyl propionate, methyl propionate, propyl propionate, and butyrolactone. The ether solvent is at least one selected from ether, tetrahydrofuran, and furan.

Example

[0060] This example is an example of the assembly of a lithium-ion battery. In this example, the current collector is an aluminum foil, and the coating material is a positive electrode active paste.

[0061] Regarding the preparation of the positive electrode active paste, lithium cobaltate, conductive carbon, and PVDF were added to NMP (N-methyl-2-pyrrolidone) at a mass ratio of 97:1.5:1.5 and mixed, and mechanically stirred uniformly to produce a paste. The viscosity of the produced positive electrode active paste was 5000 cp, and the solid content was 80%.

[0062] Regarding the production of the positive electrode plate, the above positive electrode active paste was applied to an aluminum foil, and the obtained surface density was 14 mg / cm 2 was.

[0063] Regarding the removal of the coating material in a predetermined area, the coating material in a predetermined area of the above positive electrode plate was removed using the coating material removal device for battery electrode plates of the present application. The positioning member was moved, the side plate was passed through the coating material layer and contacted with the current collector, the spraying process was started, 1.5 g of NMP was sprayed on the coating material in a predetermined area per square centimeter, after waiting for 1 s, the vacuum generator was started, the degree of vacuum was set to 90 kPa, and the pressure was maintained for 3 s to suck and remove the coating material in the predetermined area. The spraying process was started again, 1.5 g of NMP was sprayed on the predetermined area per square centimeter, the vacuum generator was started, the pressure was maintained for 1 s, and the cleaning of the current collector in the predetermined area was completed.

[0064] A tab was welded within a predetermined region of the manufactured positive electrode plate, and a lithium-ion battery was assembled.

Example

[0065] This example is another example of the assembly of a lithium-ion battery. In this example, the current collector was an aluminum foil, and the coating material was a positive electrode active paste.

[0066] Regarding the preparation of the positive electrode active paste, lithium cobaltate, conductive carbon, and PVDF were added to NMP (N-methyl-2-pyrrolidone) in a mass ratio of 90:5:5 and mixed, and mechanically stirred uniformly to produce a paste. The viscosity of the produced positive electrode active paste was 3000 cp, and the solid content was 60%.

[0067] Regarding the manufacture of the positive electrode plate, the above positive electrode active paste was applied to the aluminum foil, and the obtained surface density was 11 mg / cm 2 was.

[0068] Regarding the removal of the coating material in a predetermined region, the coating material in a predetermined region of the above positive electrode plate was removed using the coating material removal device for a battery electrode plate of the present application. The positioning member was moved, the side plate was made to penetrate the coating material layer and contact the current collector, the spraying process was started, 1 g of NMP was sprayed onto the coating material in a predetermined region per square centimeter, after waiting for 0.5 s, the vacuum generating device was started, the degree of vacuum was set to 200 kPa, and the pressure was maintained for 0.5 s to suck and remove the coating material in the predetermined region. The spraying process was started again, 1.5 g of NMP was sprayed onto the predetermined region per square centimeter, and at the same time, the vacuum generating device was started, the pressure was maintained for 1 s, and the cleaning of the current collector in the predetermined region was completed.

[0069] A tab was welded within a predetermined region of the manufactured positive electrode plate, and a lithium-ion battery was assembled.

Example

[0070] This example is another example of assembling a lithium ion battery, in which the current collector was aluminum foil and the coating material was a positive electrode active paste.

[0071] To prepare the positive electrode active paste, lithium cobalt oxide, conductive carbon, and PVDF were added to NMP (N-methyl-2-pyrrolidone) in a mass ratio of 99:0.5:0.5, mixed, and mechanically stirred to produce a paste. The viscosity of the positive electrode active paste was 7000 cp, and the solid content was 85%.

[0072] For the production of the positive electrode plate, the positive electrode active paste was applied to aluminum foil, and the resulting surface density was 17 mg / cm 2 It was.

[0073] To remove the coating material from a predetermined area, the coating material was removed from the predetermined area of the positive electrode plate using the battery electrode plate coating material removal device of the present invention. The positioning member was moved, and the side plate was brought into contact with the current collector through the coating material layer. The spraying process was initiated, and 3 g of NMP was sprayed onto the coating material of the predetermined area per square centimeter. After waiting for 3 seconds, the vacuum generator was started, the vacuum level was set to 90 kPa, and the pressure was maintained for 3 seconds to remove the coating material by suction. The spraying process was then restarted, and 1.5 g of NMP was sprayed onto the predetermined area per square centimeter. The vacuum generator was also started, and the pressure was maintained for 1 second to complete the cleaning of the current collector.

[0074] A tab was welded to a predetermined area of the positive electrode plate produced above, and a lithium ion battery was assembled. [Example]

[0075] This example is another example of assembling a lithium ion battery, in which the current collector was copper foil and the coating material was a negative electrode active paste.

[0076] Regarding the preparation of the negative electrode active paste, graphite, conductive carbon, styrene-butadiene rubber, and sodium carboxymethyl cellulose were added to deionized water at a mass ratio of 96:1.5:1.5:1.0 and mechanically stirred uniformly to produce a paste. The viscosity of the produced negative electrode active paste was 3500 cp, and the solid content was 80%.

[0077] Regarding the production of the negative electrode plate, the above positive electrode active paste was applied to a copper foil, and the obtained surface density was 8 mg / cm 2 It was.

[0078] Regarding the removal of the coating material in a predetermined area, the coating material in a predetermined area of the above negative electrode plate was removed using the coating material removal device for a battery electrode plate of the present application. The positioning member was moved, the side plate was made to penetrate the coating material layer and contact the current collector, the spraying process was started, 1 g of NMP was sprayed onto the coating material in a predetermined area per square centimeter, after waiting for 3 s, the vacuum generating device was started, the degree of vacuum was set to 100 kPa, and the pressure was maintained for 1 s to suck and remove the coating material in the predetermined area. The spraying process was started again, 1 g of NMP was sprayed onto the predetermined area per square centimeter, the vacuum generating device was started, the pressure was maintained for 1 s, and the cleaning of the current collector in the predetermined area was completed.

[0079] A tab was welded in a predetermined area of the above-produced negative electrode plate to assemble a lithium-ion battery.

Example

[0080] This example is another example of the assembly of a lithium-ion battery. In this example, the current collector was a copper foil, and the coating material was a negative electrode active paste.

[0081] Regarding the preparation of the negative electrode active paste, graphite, conductive carbon, styrene-butadiene rubber, and sodium carboxymethyl cellulose were added to deionized water at a mass ratio of 90:3.5:3.5:3.0 and mechanically stirred uniformly to produce a paste. The viscosity of the produced negative electrode active paste was 2000 cp, and the solid content was 60%.

[0082] Regarding the production of the negative electrode plate, the above positive electrode active paste was applied to a copper foil, and the obtained surface density was 6 mg / cm 2 was obtained.

[0083] Regarding the removal of the coating material in a predetermined area, the coating material in a predetermined area of the above negative electrode plate was removed using the coating material removal device for battery electrode plates of the present application. The positioning member was moved, the side plate was made to penetrate the coating material layer and contact the current collector, the spraying process was started, 0.2 g of NMP was sprayed onto the coating material in a predetermined area per square centimeter, after waiting for 0.2 s, the vacuum generator was started, the degree of vacuum was set to 300 kPa, and the pressure was maintained for 0.3 s to suck and remove the coating material in the predetermined area. The spraying process was started again, 1 g of NMP was sprayed onto the predetermined area per square centimeter, the vacuum generator was started, the pressure was maintained for 1 s, and the cleaning of the current collector in the predetermined area was completed.

[0084] A tab was welded within a predetermined area of the above-produced negative electrode plate to assemble a lithium-ion battery.

Example

[0085] This example is another example of the assembly of a lithium-ion battery. In this example, the current collector was a copper foil, and the coating material was a negative electrode active paste.

[0086] Regarding the preparation of the negative electrode active paste, graphite, conductive carbon, styrene-butadiene rubber, and sodium carboxymethyl cellulose were added to deionized water at a mass ratio of 98:0.7:0.7:0.6 and mechanically stirred uniformly to produce a paste. The viscosity of the produced negative electrode active paste was 6000 cp, and the solid content was 80%.

[0087] Regarding the production of the negative electrode plate, the above positive electrode active paste was applied to a copper foil, and the obtained surface density was 10 mg / cm 2 was obtained.

[0088] Regarding the removal of the coating material in a predetermined area, the coating material in the predetermined area of the negative electrode plate was removed using the coating material removal device for battery electrode plates of the present application. The positioning member was moved, the side plate was made to penetrate the coating material layer and contact the current collector, the spraying process was started, 2 g of NMP was sprayed onto the coating material in the predetermined area per square centimeter, after waiting for 3 s, the vacuum generating device was activated, the degree of vacuum was set to 100 kPa, and the pressure was maintained for 1 s to suck and remove the coating material in the predetermined area. The spraying process was started again, 1 g of NMP was sprayed onto the predetermined area per square centimeter, the vacuum generating device was activated, and the pressure was maintained for 1 s to complete the cleaning of the current collector in the predetermined area.

[0089] Tabs were welded within a predetermined area of the manufactured negative electrode plate above, and a lithium-ion battery was assembled. (Comparative Example 1)

[0090] For the positive electrode plate manufactured in Example 3, the coating material in a predetermined area was removed using a laser cleaning device, and other steps were not changed. (Comparative Example 2)

[0091] For the negative electrode plate manufactured in Example 6, the coating material in a predetermined area was removed using a laser cleaning device, and other steps were not changed.

[0092] Experimental measurement (1) Measurement of the residue of the coating material in a predetermined area of the battery electrode plate and measurement of the surface damage of the current collector in the predetermined area Regarding the positive and negative electrode plates manufactured in Examples 1 to 6 and Comparative Examples 1 and 2, the residue situation of the coating material in the predetermined area and the damage situation of the current collector in the predetermined area were observed with a 30-fold magnifying glass, and the measurement results are shown in Table 1.

[0093] (2) Measurement of the capacity of the lithium-ion battery Battery capacity measurements were performed on the lithium-ion batteries manufactured in Examples 1 to 6 and Comparative Examples 1 to 2. First, the lithium-ion battery was allowed to stand for 3 min, then constant-current charged to 4.3 V at a charging current of 0.5 C, and then constant-voltage charged to 0.05 C to obtain the initial charging capacity AGC0. After standing for 3 min, it was then discharged at a constant current of 0.5 C to 3.0 V to obtain the initial discharge capacity D0. After standing for 3 min, the measurement of the lithium-ion battery capacity was completed, and the measurement results are shown in Table 1. [Table 1]

[0094] As can be seen from the measurement results in Table 1, when removing the coating material from the positive and negative electrode plates by the coating material removal method for battery electrode plates according to the present application, compared with the conventional method for removing the coating material from the battery electrode plate, the residue of the coating material on the surface of the current collector in a predetermined area is less, and the damage to the current collector after removing the coating material is also small. Therefore, when this battery electrode plate is used for battery assembly, the battery performance is more excellent.

[0095] The above are only preferred embodiments of the present application and do not limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should all be included within the protection scope of the present application. [Explanation of Reference Numerals]

[0096] 1 Battery electrode plate 11 Current collector 12 Coating material 13 Tab 14 Predetermined area 100 Coating material removal device for battery electrode plates 2 Positioning member 21 Side plate 211 Inner side plate 212 Outer side plate 22 Hollow space 23 Top plate 231 Inner top plate 232 Outer top plate 3 Spray port 4 Suction port 5 Suction line 6 Main spray pipe 7 Spray plate 8 Spray line 41 Passageway through which the suction port takes in and communicates with the hollow space 42 Suction port surface 213 Beam

Claims

1. A coating material removing device (100) for a battery electrode plate, wherein the battery electrode plate (1) includes a current collector (11) and a coating material (12) attached to the surface of the current collector, the coating material removing device (100) for the battery electrode plate removes the coating material (12) in a predetermined area (14) of the battery electrode plate (1), the coating material removing device (100) for the battery electrode plate includes a positioning member (2), a spray port (3), and a suction port (4), the positioning member (2) includes side plates (21), a hollow space (22) is surrounded by the side plates (21), and the side plates (21) contact the current collector (11) to isolate the coating material (12) in the predetermined area (14) into the hollow space (22), the spray port (3) is located in the hollow space (22), communicates with a liquid source, sprays liquid onto the coating material (12) in the predetermined area (14), and increases the fluidity of the coating material (12) in the predetermined area (14) by the liquid, the suction port (4) is located in the hollow space (22), communicates with a vacuum generating device, and sucks the coating material (12) in the predetermined area (14) from the current collector, the side plates (21) include an inner side plate (211) and an outer side plate (212), the inner side plate (211) and the outer side plate (212) are spaced apart and form a suction pipeline (5) therebetween, the suction pipeline (5) communicates with the suction port (4), and one end of the outer side plate (212) close to the battery electrode plate (1) contacts the current collector (11). A coating material removing device for a battery electrode plate, characterized in that.

2. The positioning member (2) further includes a top plate (23), the side plates (21) are installed at the periphery of the top plate (23), and contact the current collector (11) to seal the hollow space (22). The coating material removing device for a battery electrode plate according to Claim 1, characterized in that.

3. The suction port (4) has a suction port surface (42) surrounding a passage (41) communicating with the hollow space (22), and at least a part of the suction port surface (42) is in a trumpet shape opening toward the hollow space (22). The coating material removing device for a battery electrode plate according to Claim 1, characterized in that.

4. The side plate (21) includes an inner side plate (211) and an outer side plate (212), the top plate (23) includes an inner top plate (231) and an outer top plate (232), the inner side plate (211) and the inner top plate (231) are connected to form the inner wall of the suction pipeline (5), the outer side plate (212) and the outer top plate (232) are connected to form the outer wall of the suction pipeline (5), the inner wall of the suction pipeline (5) and the outer wall of the suction pipeline (5) form the suction pipeline (5), the suction pipeline (5) communicates with the suction port (4), and one end of the outer side plate (212) close to the battery electrode plate (1) contacts the current collector (11) to seal the hollow space (22). The coating material removing device for battery electrode plates according to claim 2, characterized in that.

5. One end of the suction pipeline (5) close to the battery electrode plate (1) forms the suction port (4). The coating material removing device for battery electrode plates according to claim 1, characterized in that.

6. One end of the inner side plate (211) close to the battery electrode plate (1) contacts the coating material (12) in the predetermined area (14) and has a space from the current collector (11), and forms the suction port (4). The coating material removing device for battery electrode plates according to claim 1, characterized in that.

7. The distance between the part of the suction port (4) away from the inner side plate (211) and the current collector (11) is greater than the distance between the part of the suction port (4) close to the inner side plate (211) and the current collector (11). The coating material removing device for battery electrode plates according to claim 6, characterized in that.

8. One end of the inner side plate (211) close to the battery electrode plate (1) contacts the surface of the coating material (12) in the predetermined area (14) away from the current collector (11). The coating material removing device for battery electrode plates according to claim 1, characterized in that.

9. A spray main pipeline (6) is arranged inside the top plate (23), a spray port (3) is formed on the side of the spray main pipeline (6) close to the battery electrode plate (1) of the top plate (23), and the spray port (3) communicates with a liquid source through the spray main pipeline (6) to spray liquid on the coating material (12) in the predetermined area (14). The coating material removing device for battery electrode plates according to claim 2, characterized in that.

10. 10. The battery electrode plate coating material removal device according to claim 9, further comprising a spray plate (7), the spray plate (7) being disposed within the hollow space (22), a plurality of spray pipes (8) communicating with the main spray pipe (6) being disposed within the spray plate (7), and the spray ports (3) being formed on the sides of the plurality of spray pipes (8) away from the main spray pipe (6).

11. A method for removing a coating material from a predetermined region of a battery plate using the battery plate coating material removing device according to any one of claims 1 to 10, placing the positioning member on the battery plate so that the side plate contacts the current collector and isolates the coating material in the predetermined area within the hollow space; A step of spraying a liquid from a spray nozzle in the hollow space to wet the coating material in the predetermined area; and sucking the coating material that has soaked in the predetermined area from the current collector through the suction port.

12. After the coating material infiltrated in the predetermined area is sucked from the current collector through the suction port, 12. The method for removing a coating material from a battery plate according to claim 11, further comprising the steps of spraying a liquid onto the current collector from which the coating material has been sucked, and sucking the liquid from the current collector through a suction port.

13. A liquid is sprayed onto the current collector to which the coating material has been sucked, and the liquid is sucked from the current collector through a suction port, The method for removing a coating material from a battery plate according to claim 12, further comprising the step of subjecting the battery plate to a drying treatment.

14. The method for removing coating material for battery electrode plates according to claim 11, wherein the standard for spraying the liquid is to spray 1 to 3 g of liquid per square centimeter area on the predetermined area.

15. 12. The method for removing a coating material for a battery electrode plate according to claim 11, wherein a vacuum generator is connected to the suction port (4), and the vacuum level of the vacuum generator is 50 to 300 kPa.

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