Coating apparatus and pole piece

Abstract

The utility model provides a kind of coating device and pole piece, the coating device of utility model embodiment includes coating assembly, scraping and sucking component. Among them, coating assembly is used to carry out coating active material layer to current collector;Scraping and sucking component is located at the downstream of coating assembly, scraping and sucking component includes doctor blade head, doctor blade head has scraping and sucking mouth and the suction channel of communication scraping and sucking mouth, scraping and sucking mouth is suitable for and current collector is resisted, to form groove position by scraping part active material layer on current collector.Example of the utility model embodiment of coating device can form groove position by completely scraping part active material layer from current collector, greatly improve the rate of pole piece, while also can improve the coating quality of the coating device of utility model embodiment.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, and in particular to a coating device and an electrode sheet. Background Technology

[0002] The electrode sheet usually has slots for installing tabs or protective tape.

[0003] In related technologies, after the electrode coating is completed and dried, grooves are usually formed on the electrode by a scraping process. However, this method cannot completely remove the part of the active material layer that is bonded to the current collector after it is completely dried to form grooves, which seriously affects the electrode yield.

[0004] Therefore, the relevant technology has the problem that it is impossible to completely scrape off part of the active material layer on the current collector to form a groove. Utility Model Content

[0005] This invention provides a coating device to solve the problem in related technologies that the active material layer on the current collector cannot be completely scraped off.

[0006] The coating apparatus of this utility model embodiment includes: A coating assembly for coating an active material layer onto a current collector; A scraping and suction assembly is located downstream of the coating assembly. The scraping and suction assembly includes a scraper head with a scraping and suction port and a suction channel communicating with the scraping and suction port. The scraping and suction port is adapted to abut against the current collector to scrape off a portion of the active material layer on the current collector to form a groove.

[0007] The coating apparatus of this utility model embodiment, by setting a scraping and suction component downstream of the coating component, can immediately form a groove by scraping a portion of the active material layer on the current collector after the coating component has coated the active material layer onto the current collector. Since the active material layer has not yet dried and the adhesion between the active material layer and the current collector is still relatively weak, a portion of the active material layer can be completely scraped off from the current collector to form a groove, thereby greatly improving the yield of the electrode sheet and also improving the coating quality of the coating apparatus of this utility model embodiment.

[0008] Therefore, the coating device of this utility model embodiment can completely scrape off part of the active material layer from the current collector to form a groove, which greatly improves the yield of the electrode and also improves the coating quality of the coating device of this utility model embodiment.

[0009] In some embodiments, the scraper head includes a scraper blade and a side plate, the scraper blade and the side plate being connected together to define the suction channel, the side plate including a first side plate located on both sides of the scraper blade and a second side plate opposite to the scraper blade, the height of the scraper blade being greater than the height of the second side plate.

[0010] In some embodiments, the height difference H1 between the scraper and the second side plate is 0.5~5mm; and / or The distance L2 between the scraper and the second side plate is 0.5~4mm; and / or The width L4 of the scraper is 10~30mm.

[0011] In some embodiments, the height difference H1 between the scraper and the second side plate is 1~3mm; and / or The distance L2 between the scraper and the second side plate is 1~2.5mm; and / or The width L4 of the scraper is 12~26mm.

[0012] In some embodiments, the scraper head is single or multiple, and the multiple scraper heads are spaced apart in the width direction of the electrode sheet.

[0013] In some embodiments, a positioning rod is provided between adjacent scraper heads, one end of the positioning rod is connected to one of the scraper heads, and the other end of the positioning rod is connected to the other scraper head.

[0014] In some embodiments, the scraper head further includes a mixing chamber, and the material suction channel is connected to the mixing chamber; The scraper head also has a diluent inlet, which is connected to the mixing chamber; The scraper head also has a suction port, which is connected to the mixing chamber.

[0015] In some embodiments, the scraping and suction assembly further includes a collection tank and a vacuum device, wherein the inlet of the collection tank is connected to the suction port and the outlet of the collection tank is connected to the vacuum device.

[0016] In some embodiments, the scraping and suction assembly further includes a vacuum detection assembly connected to the suction port to detect the vacuum level of the suction port.

[0017] In some embodiments, the diameter D1 of the diluent inlet is 3~15 mm; and / or The distance L1 between the diluent inlet and the edge of the second side plate adjacent to the collector is 2~10mm; and / or The diameter D2 of the suction port is 5~20mm; and / or The distance L3 between the suction port and the edge of the second side plate adjacent to the collector is 5~40mm; and / or The flow rate Q of the diluent inlet is 1~15 ml / s, and / or The vacuum level P at the suction port is 85~95 kPa.

[0018] In some embodiments, the diameter D1 of the diluent inlet is 5-10 mm; and / or The distance L1 between the diluent inlet and the edge of the second side plate adjacent to the collector is 3~5mm; and / or The diameter D2 of the suction port is 10~15mm; and / or The distance L3 between the suction port and the edge of the second side plate adjacent to the collector is 13~25mm; and / or The flow rate Q of the diluent inlet is 2~10 ml / s; and / or The vacuum level P at the suction port is 80~100 kPa.

[0019] This utility model also provides an electrode sheet.

[0020] The electrode sheet of this utility model embodiment is an electrode sheet coated by the coating device described in the above embodiment.

[0021] In some embodiments, the electrode sheet has the groove, and the dimension L5 of the groove in the length direction of the electrode sheet is 3~15mm, and / or The dimension L6 of the groove in the electrode width direction is 10~30mm, and the dimension L6 of the groove in the electrode width direction is equal to the width L4 of the scraper.

[0022] In some embodiments, the electrode sheet has the groove, and the dimension L5 of the groove in the length direction of the electrode sheet is 4-10 mm, and / or The dimension L6 of the slot in the electrode width direction is 11~26mm. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the coating device according to an embodiment of the present invention; Figure 2This is a schematic diagram of the structure of the scraper suction assembly of the coating device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the installation of the scraper head of the coating device according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the scraper head of the coating device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the electrode sheet according to an embodiment of the present invention.

[0025] In the picture: 100. Coating device; 200. Electrode; 210. Current collector; 220. Active material layer; 230. Tank position; 1. Coating assembly; 2. Scraping and suction assembly; 201. Scraper head; 2011. Scraper suction port; 2012. Suction channel; 2013. Scraper blade; 2014. Side plate; 2015. Mixing chamber; 2016. Diluent inlet; 2017. Suction port; 2018. Collection tank; 2019. Vacuum tank; 202. Vacuum detection assembly; 203. Positioning rod. Detailed Implementation

[0026] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] This utility model provides a coating device 100.

[0030] The coating device 100 of this utility model embodiment includes a coating component 1 and a scraping and suction component 2.

[0031] The coating component 1 is used to coat the current collector 210 with an active material layer 220. The scraping and suction component 2 is located downstream of the coating component 1. The scraping and suction component 2 includes a scraper head 201, which has a scraping and suction port 2011 and a suction channel 2012 communicating with the scraping and suction port 2011. The scraping and suction port 2011 is adapted to abut against the current collector 210 to scrape off part of the active material layer 220 on the current collector 210 to form a groove 230.

[0032] The coating apparatus 100 of this embodiment of the present invention, by providing a scraping and suction component 2 downstream of the coating component 1, can immediately scrape off a portion of the active material layer 220 on the current collector 210 after the coating component 1 has coated the active material layer 220 onto the current collector 210 to form a groove 230. Since the active material layer 220 has not yet dried and the adhesion between the active material layer 220 and the current collector 210 is still relatively weak, a portion of the active material layer 220 can be completely scraped off from the current collector 210 to form the groove 230, thereby greatly improving the yield of the electrode 200 and also improving the coating quality of the coating apparatus 100 of this embodiment of the present invention.

[0033] Therefore, the coating apparatus 100 of this utility model embodiment can completely scrape off part of the active material layer 220 from the current collector 210 to form the groove 230, which greatly improves the yield of the electrode 200 and also improves the coating quality of the coating apparatus 100 of this utility model embodiment.

[0034] In some embodiments, the scraper head includes a scraper blade 2013 and a side plate 2014, which are connected together to define a suction channel 2012. The side plate 2014 includes a first side plate 2014 located on both sides of the scraper blade 2013 and a second side plate 2014 opposite to the scraper blade 2013. The height of the scraper blade 2013 is greater than the height of the second side plate 2014.

[0035] In some embodiments, the height difference H1 between the scraper 2013 and the second side plate 2014 is 0.5~5mm.

[0036] Preferably, the height difference H1 between the scraper 2013 and the second side plate 2014 is 1~3mm.

[0037] Furthermore, the height difference H1 between the scraper 2013 and the second side plate 2014 is 1mm, 2mm and 3mm, respectively.

[0038] It is understandable that the height difference H1 between the scraper 2013 and the second side plate 2014 determines the distance between the suction channel and the electrode. If the height difference H1 between the scraper 2013 and the second side plate 2014 is too large, the scraped active material layer will not be sucked away. If the height difference H1 between the scraper 2013 and the second side plate 2014 is too small, the scraped active material layer will accumulate at the second side plate 2014. Therefore, setting the height difference H1 between the scraper 2013 and the second side plate 2014 to the above range can ensure that all the scraped active material layer is sucked away while preventing the scraped active material layer from accumulating at the second side plate 2014.

[0039] In some embodiments, the distance L2 between the scraper 2013 and the second side plate 2014 is 0.5~4mm.

[0040] Preferably, the distance L2 between the scraper 2013 and the second side plate 2014 is 1~2.5mm.

[0041] Furthermore, the distance L2 between the scraper 2013 and the second side plate 2014 is 1.0mm, 1.5mm, 2.0mm, and 2.5mm.

[0042] It is understandable that the distance L2 between the scraper 2013 and the second side plate 2014 determines the size of the suction channel. If the distance L2 between the scraper 2013 and the second side plate 2014 is too large, it will affect the airflow rate in the suction channel, and thus affect the negative pressure strength in the suction channel, which will lead to the problem that the scraped active material layer cannot be completely sucked up. If the distance L2 between the scraper 2013 and the second side plate 2014 is too small, it will easily lead to the problem of the suction channel being blocked. Therefore, the distance L2 between the scraper 2013 and the second side plate 2014 is set to the above-mentioned size, which can ensure that the scraped active material layer is completely sucked up, while avoiding the scraped active material layer from blocking the suction channel.

[0043] In some embodiments, the width L4 of the scraper 2013 is 10~30mm.

[0044] Preferably, the width L4 of the scraper 2013 is 12~26mm.

[0045] Furthermore, the width L4 of the scraper 2013 is 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, or 26mm.

[0046] It is understood that the width L4 of the scraper 2013 determines the size of the tab groove, and the embodiment of this utility model can be selected and set according to actual needs.

[0047] In some embodiments, the scraper head 201 is single or multiple, and the multiple scraper heads 201 are spaced apart in the width direction of the electrode 200.

[0048] It is understandable that the doctor blade head 201 can be set to be single or multiple, depending on the needs of actual coating production.

[0049] Meanwhile, multiple scraper heads 201 are configured, and multiple scraper heads 201 can simultaneously scrape and absorb the active material coating on the current collector 210 to form grooves 230.

[0050] In some embodiments, a positioning rod 203 is provided between adjacent scraper heads 201, with one end of the positioning rod 203 connected to one of the scraper heads 201 and the other end of the positioning rod 203 connected to the other scraper head 201.

[0051] If multiple scraper heads 201 are provided, and a positioning rod 203 is provided between adjacent scraper heads 201, the distance between adjacent scraper heads 201 can be positioned, thereby positioning the slot 230 on the electrode 200 and avoiding the problem of the slot 230 of the electrode 200 shifting during the scraping and suction process.

[0052] In some embodiments, the scraper head 201 further includes a mixing chamber 2015, and the suction channel 2012 is connected to the mixing chamber 2015; The scraper head 201 also has a diluent inlet 2016, which is connected to the mixing chamber 2015; The scraper head 201 also has a suction port 2017, which is connected to the mixing chamber 2015.

[0053] It is understandable that the active material coating that is scraped off enters the mixing chamber 2015 and is mixed into a mixture, which makes it easier for the mixture to be drawn out of the mixing chamber 2015 through the suction port 2017. This facilitates the removal of the scraped active material coating and also avoids clogging the suction port 2017, thus preventing it from affecting work efficiency.

[0054] In some embodiments, the scraping and suction assembly 2 further includes a liquid collection tank 2018 and a vacuum device 2019, wherein the inlet of the liquid collection tank 2018 is connected to the suction port 2017 and the outlet of the liquid collection tank 2018 is connected to the vacuum device 2019.

[0055] By connecting the vacuum device 2019 to the liquid collection tank 2018, a negative pressure environment can be created inside the liquid collection tank, which makes it easier to draw the mixed liquid in the mixing chamber 2015 into the liquid collection tank.

[0056] In some embodiments, the scraping and suction assembly 2 further includes a vacuum detection assembly 202, which is connected to the suction port 2017 to detect the vacuum level of the suction port 2017.

[0057] By setting a vacuum detection component 202 at the suction port 2017, which can be a vacuum gauge, the vacuum degree of the suction port 2017 can be detected. The vacuum degree of the suction port 2017 can be monitored in real time, and when the vacuum degree of the suction port 2017 is insufficient, the problem can be detected and solved in time.

[0058] In some embodiments, the diameter D1 of the diluent inlet 2016 is 3~15mm.

[0059] Preferably, the diameter D1 of the diluent inlet 2016 is 5~10mm.

[0060] Furthermore, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm are also available.

[0061] It is understandable that the diameter D1 of the diluent inlet affects the diluent inlet flow rate. Under the same diluent inlet flow rate, the smaller D1 is, the higher the flow rate, which is beneficial for flushing the scraped slurry. However, if D1 is too small, the flow resistance will be large, which will affect the diluent inlet flow rate. By setting the diameter D1 of the diluent inlet 2016 to the above orientation, the scraped active material layer can be better absorbed and will not accumulate on the scraper.

[0062] In some embodiments, the distance L1 between the diluent inlet 2016 and the edge of the adjacent current collector 210 of the second side plate 2014 is 2~10mm.

[0063] Preferably, the distance L1 between the diluent inlet 2016 and the edge of the adjacent current collector 210 of the second side plate 2014 is 3~5mm.

[0064] Furthermore, the distance L1 between the diluent inlet 2016 and the edge of the adjacent current collector 210 of the second side plate 2014 is 3mm, 4mm, and 5mm.

[0065] It is understandable that the distance L1 between the diluent inlet 2016 and the edge of the collector 210 adjacent to the second side plate 2014 is designed to ensure that the incoming diluent can better dilute the scraped active material layer. The smaller L1 is, the more directly the incoming diluent can contact the scraped active material layer. However, due to mechanical limitations, it cannot be smaller. The larger L1 is, the farther away from the scraped active material layer, which cannot play a better dilution role, causing the slurry to accumulate on the scraper head, and thus the slurry in the tank area cannot be scraped clean. Therefore, by setting the distance L1 between the diluent inlet 2016 and the edge of the collector 210 adjacent to the second side plate 2014 to the above range, the scraped active material layer can be better diluted, which is beneficial for sucking away the scraped active material layer.

[0066] In some embodiments, the diameter D2 of the suction port 2017 is 5~20mm.

[0067] Preferably, the diameter D2 of the suction port 2017 is 10~15mm.

[0068] Furthermore, the diameter D2 of the suction port 2017 is 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm.

[0069] It is understandable that the diameter D2 of the suction port is to ensure the suction speed of the vacuum. The larger D2 is, the lower the vacuum flow rate, which is not conducive to the removal of the active material layer. The smaller D2 is, the greater the resistance, which reduces the vacuum degree and is also not conducive to the removal of the slurry. By setting the diameter D2 of the suction port 2017 to the above range, the active material layer can be better removed.

[0070] In some embodiments, the distance L3 between the suction port 2017 and the edge of the second side plate 2014 adjacent to the current collector 210 is 5~40mm.

[0071] Preferably, the distance L3 between the suction port 2017 and the edge of the adjacent current collector 210 of the second side plate 2014 is 13~25mm.

[0072] In some embodiments, the flow rate Q of the diluent inlet 2016 is 1~15 ml / s.

[0073] Preferably, the flow rate Q of the diluent inlet 2016 is 2~10 ml / s.

[0074] It is understandable that the diluent inlet flow rate Q is to ensure that the scraped active material layer is diluted. If Q is too large, it will waste diluent; if Q is too small, it will not have a dilution effect. By setting the diluent inlet flow rate Q to the above range, the active material layer can be effectively diluted while avoiding waste of diluent.

[0075] In some embodiments, the vacuum degree P of the suction port 2017 is 80~100 kPa.

[0076] Preferably, the vacuum degree P of the suction port 2017 is 85~95 kPa.

[0077] It is understandable that the vacuum level P is to ensure that the scraped active material layer can be sucked away. The higher the vacuum level, the better. However, the higher the vacuum level, the higher the investment in the vacuum pump. If the vacuum level is too low, the active material layer cannot be sucked away. By setting the vacuum level P to the above range, the cost can be reduced while ensuring that the active material layer is sucked away.

[0078] This utility model also provides an electrode 200.

[0079] The electrode 200 in this embodiment of the present invention is an electrode 200 coated by the coating apparatus 100 described in the above embodiment.

[0080] In some embodiments, the electrode 200 is provided with a slot 230, the dimension L5 of the slot 230 in the length direction of the electrode 200 is 3~15mm, and / or the dimension L6 of the slot 230 in the width direction of the electrode 200 is 10~30mm, and the dimension L6 of the slot 230 in the width direction of the electrode 200 is equal to the width L4 of the scraper 2013.

[0081] Furthermore, the dimensions L5 of the slot 230 along the length of the electrode 200 are 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, and 15mm.

[0082] Furthermore, the dimensions L6 of the slot 230 in the width direction of the electrode 200 are 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, and 30mm.

[0083] In some embodiments, the electrode 200 is provided with a slot 230, the dimension L5 of the slot 230 in the length direction of the electrode 200 is 4~10mm, and / or the dimension L6 of the slot 230 in the width direction of the electrode 200 is 11~26mm.

[0084] It is understood that the above dimensions determine the size of the slot, that is, the size that can accommodate the tab, and those skilled in the art can make the selection according to actual needs.

[0085] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A coating apparatus, characterized in that, include: A coating assembly for coating an active material layer onto a current collector; A scraping and suction assembly is located downstream of the coating assembly. The scraping and suction assembly includes a scraper head with a scraping and suction port and a suction channel communicating with the scraping and suction port. The scraping and suction port is adapted to abut against the current collector to scrape off a portion of the active material layer on the current collector to form a groove.

2. The coating apparatus according to claim 1, characterized in that, The scraper head includes a scraper blade and a side plate, which are connected together to define the material suction channel. The side plate includes a first side plate located on both sides of the scraper blade and a second side plate opposite to the scraper blade. The height of the scraper blade is greater than the height of the second side plate.

3. The coating apparatus according to claim 2, characterized in that, The height difference H1 between the scraper and the second side plate is 0.5~5mm; and / or The distance L2 between the scraper and the second side plate is 0.5~4mm; and / or The width L4 of the scraper is 10~30mm.

4. The coating apparatus according to claim 3, characterized in that, The height difference H1 between the scraper and the second side plate is 1~3mm; and / or The distance L2 between the scraper and the second side plate is 1~2.5mm; and / or The width L4 of the scraper is 12~26mm.

5. The coating apparatus according to claim 1, characterized in that, The scraper head may be single or multiple, and the multiple scraper heads may be spaced apart in the width direction of the electrode sheet.

6. The coating apparatus according to claim 5, characterized in that, A positioning rod is provided between adjacent scraper heads, one end of which is connected to one of the scraper heads and the other end of which is connected to the other scraper head.

7. The coating apparatus according to any one of claims 2-4, characterized in that, The scraper head also has a mixing chamber, and the material suction channel is connected to the mixing chamber; The scraper head also has a diluent inlet, which is connected to the mixing chamber; The scraper head also has a suction port, which is connected to the mixing chamber.

8. The coating apparatus according to claim 7, characterized in that, The scraping and suction assembly also includes a liquid collection tank and a vacuum device. The inlet of the liquid collection tank is connected to the suction port, and the outlet of the liquid collection tank is connected to the vacuum device.

9. The coating apparatus according to claim 7, characterized in that, The scraping and suction assembly also includes a vacuum detection assembly, which is connected to the suction port to detect the vacuum level of the suction port.

10. The coating apparatus according to claim 7, characterized in that, The diameter D1 of the diluent inlet is 3~15mm; and / or The distance L1 between the diluent inlet and the edge of the second side plate adjacent to the collector is 0.1~5mm; and / or The diameter D2 of the suction port is 5~20mm; and / or The distance L3 between the suction port and the edge of the second side plate adjacent to the collector is 5~40mm; and / or The flow rate Q of the diluent inlet is 1~15 ml / s, and / or The vacuum level P at the suction port is 85~95 kPa.

11. The coating apparatus according to claim 10, characterized in that, The diameter D1 of the diluent inlet is 5~10mm; and / or The distance L1 between the diluent inlet and the edge of the second side plate adjacent to the collector is 0.5~2mm; and / or The diameter D2 of the suction port is 10~15mm; and / or The distance L3 between the suction port and the edge of the second side plate adjacent to the collector is 13~25mm; and / or The flow rate Q of the diluent inlet is 2~10 ml / s; and / or The vacuum level P at the suction port is 80~100 kPa.

12. An electrode sheet, characterized in that, The electrode is an electrode coated by the coating apparatus according to any one of claims 1-11.

13. The electrode sheet according to claim 12, characterized in that, The electrode sheet has the groove, and the dimension L5 of the groove in the length direction of the electrode sheet is 3~15mm, and / or The dimension L6 of the groove in the electrode width direction is 10~30mm, and the dimension L6 of the groove in the electrode width direction is equal to the width L4 of the scraper.

14. The electrode sheet according to claim 13, characterized in that, The electrode sheet has the groove, and the dimension L5 of the groove in the length direction of the electrode sheet is 4~10mm, and / or The dimension L6 of the slot in the electrode width direction is 11~26mm.

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