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EP-4295960-B1 - COATING SYSTEM

EP4295960B1EP 4295960 B1EP4295960 B1EP 4295960B1EP-4295960-B1

Inventors

  • PENG, Angong
  • TANG, Zhenguang
  • SHANG, Hongwu
  • YANG, Pengjun
  • LIN, Yinxiang

Dates

Publication Date
20260513
Application Date
20230228

Claims (12)

  1. A coating system for coating a substrate (10), wherein the substrate (10) comprises a first coating region (11) and a second coating region (13) adjacent to the first coating region (11), whereby the coating system comprises: a first gravure mechanism (100) configured to apply a first functional layer (20) onto the first coating region (11); and a second gravure mechanism (200) located in a transporting direction of the substrate downstream from the first gravure mechanism (100), wherein the second gravure mechanism (200) is configured to: receive the substrate (10) having the first functional layer (20), and apply a second functional layer (30) made of a material different from that of the first functional layer (20) onto the second coating region (13) distinct from the first coating region; characterized in that the first gravure mechanism (100) includes a pressing roller (110) and a first gravure roller (120) a winding roller for placing the substrate (10), the pressing roller (110) and the first gravure roller (120) are disposed adjacent to each other and are configured to rotate simultaneously in different directions to transport the substrate (10); wherein the winding roller is located in the transporting direction of the substrate (10) upstream from the first gravure roller (120) and is higher than the first gravure roller (120) in a vertical direction.
  2. The coating system according to claim 1, characterized in that the first gravure mechanism (100) comprises a first gravure roller (120) and a first liquid storage tank (130) loading the first functional layer (20), wherein the first gravure roller (120) is rotatable relative to the first liquid storage tank (130) and is partly located in the first liquid storage tank (130), and surface of the substrate (10) is tangent to that of the first gravure roller (120), wherein the first gravure roller (120) is rotated to pick up and apply the first functional layer (20).
  3. The coating system according to claim 2, characterized in that the first gravure roller (120) comprises a first roller body (121), wherein surface of the first roller body (121) is provided with a first engraving region (122) having a plurality of first reticulated patterns (1221), width of the first engraving region (122) being equal to that of the first coating region (11).
  4. The coating system according to claim 3, characterized in that the second coating region (13) is disposed at an edge of an outer periphery of the first coating region (11), wherein the substrate (10) further comprises a blank region (12) located at a side of the second coating region (13) facing away from the first coating region (11), the surface of the first roller body (121) is provided with a first blank-leaving region (123) adjacent to the first engraving region (122), and the first blank-leaving region (123) has a smooth surface, width of the first blank-leaving region (123) being greater than that of the blank region (12).
  5. The coating system according to claim 4, characterized in that the first engraving region (122) is provided in a quantity of at least two, and one first blank-leaving region (123) is disposed between every two adjacent first engraving regions (122).
  6. The coating system according to any one of claims 4 to 5, characterized in that the first gravure mechanism (100) further comprises a scraper (140), wherein a blade of the scraper (140) is tangent to surfaces of the first engraving region (122) and the first blank-leaving region (123).
  7. The coating system according to any one of claims 4 to 6, characterized in that in the transporting direction of the substrate (10) downstream from the first gravure mechanism (100), the second gravure mechanism (200) comprises a second gravure roller (210) and a second liquid storage tank (220) loading the second functional layer (30), wherein the second gravure roller (210) is rotatable relative to the second liquid storage tank (220) and is partly located in the second liquid storage tank (220), and the surface of the substrate (10) is tangent to that of the second gravure roller (210), wherein the second gravure roller (210) is rotated to pick up and apply the second functional layer (30).
  8. The coating system according to claim 7, characterized in that the second gravure roller (210) comprises a second roller body (211), wherein surface of the second roller body (211) is provided with a second engraving region (212) and a second blank-leaving region (213), and a sum of the widths of the second blank-leaving region (213) and the second engraving region (212) being equal to the width of the blank region (12); and surface of the second engraving region (212) is provided with a plurality of second reticulated patterns (2121), and the second blank-leaving region (213) has a smooth surface.
  9. The coating system according to claim 8, characterized in that the second roller body (211) further comprises an escape groove (214), wherein the escape groove (214) runs through a circumferential side of the second roller body (211) to communicate with outside, width of the escape groove (214) being equal to that of the first coating region (11).
  10. The coating system according to claim 8, characterized in that one second blank-leaving region (213) is disposed between every two adjacent escape grooves (214), and edges of two ends of each of the escape grooves (214) are both provided with one second engraving region (212).
  11. The coating system according to any one of claims 7 to 10, characterized in that the coating system further comprises a second through roller (400), wherein the second through roller (400) is disposed between the second gravure roller (210) and the first gravure roller (120).
  12. The coating system according to any preceding claim, characterized in that the coating system further comprises a first through roller (300), wherein the first through roller (300) is disposed between the winding roller and the pressing roller (110).

Description

TECHNICAL FIELD This application relates to the field of traction battery technologies, and more specifically, to a coating system. BACKGROUND During preparation of an electrode plate, a primer coating is typically first applied onto a substrate, and then after the primer coating is dried, an active material layer and an insulation glue layer are simultaneously applied. During coating, slurries of the active material layer and the insulation glue layer are suitable to be mixed together, resulting in an excessively thin edge or an excessively thick edge of the active material layer, thus impacting service life and safety of the battery and leading to a high scrap rate and defect rate of the substrate. CN 211 404 608 U discloses a heat-resistant cohesive low-cost coating film which comprises a base material layer and a functional layer, and the functional layer is formed on at least one surface of the base material layer; wherein the functional layer comprises an inorganic functional layer and an organic functional layer. US 2012/183681 A1 discloses that before the application of a liquid application agent to a base material having at least an outer surface of uneven shape, a low-viscosity liquid having a lower viscosity than that of the application agent is applied to a region of the base material, the application agent being supposed to be applied to the region. The low-viscosity liquid is preferably a liquid having compatibility with the application agent. SUMMARY In view of this, this application provides a coating system as defined in the appended claims. A coating system for coating a substrate, where the substrate includes a first coating region and a second coating region adjacent to the first coating region, and the coating system includes a first gravure mechanism and a second gravure mechanism, where the first gravure mechanism is configured to apply a first functional layer onto the first coating region, and the second gravure mechanism is located in a transporting direction of the substrate downstream from the first gravure mechanism and able to receive the substrate having the first functional layer and apply a second functional layer made of a material different from that of the first functional layer onto the second coating region. In the coating system, with provision of first gravure mechanism and the second gravure mechanism, when the substrate is continuously transported in a same direction, the two functional layers made of different materials can be sequentially applied onto corresponding regions of the substrate, and then an active material layer is applied, facilitating improving continuity and efficiency of coating and decreasing a scrap rate and defect rate of the substrate. In an embodiment, the first gravure mechanism includes a first gravure roller and a first liquid storage tank loading the first functional layer, where the first gravure roller is rotatable relative to the first liquid storage tank and is partly located in the first liquid storage tank, and surface of the substrate is tangent to that of the first gravure roller, where the first gravure roller is rotated to pick up and apply the first functional layer. In this way, as the first gravure roller rotates, the first gravure roller can pick up the first functional layer that is in the first liquid storage tank and print and apply it onto the first coating region. In one embodiment, the first gravure roller includes a first roller body, where surface of the first roller body is provided with a first engraving region having a plurality of first reticulated patterns, width of the first engraving region being equal to that of the first coating region. In this way, when the first roller body rotates, slurry in the first liquid storage tank can be attached into the first reticulated pattern, facilitating application of the slurry. In one embodiment, the second coating region is disposed at an edge of an outer periphery of the first coating region, where the substrate further includes a blank region located at a side of the second coating region facing away from the first coating region, the surface of the first roller body is provided with a first blank-leaving region adjacent to the first engraving region, and the first blank-leaving region has a smooth surface, width of the first blank-leaving region being greater than that of the blank region. In this way, the first blank-leaving region of the first roller body can be in one-to-one correspondence with the blank region of the substrate to meet requirements of coating. In one embodiment, the first engraving region is provided in a quantity of at least two, and one first blank-leaving region is disposed between every two adjacent first engraving regions. In this way, efficiency of coating and efficiency of subsequent processing can be effectively improved. In one embodiment, the first gravure mechanism further includes a scraper, where a blade of the scraper is tangent to sur