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CN-122000271-A - Electrode sheet manufacturing device and electrode sheet manufacturing method

CN122000271ACN 122000271 ACN122000271 ACN 122000271ACN-122000271-A

Abstract

The present invention relates to an electrode sheet manufacturing apparatus and an electrode sheet manufacturing method. The electrode sheet manufacturing apparatus includes a conveying device, a first pressing device, a second pressing device, and a step roller pressing device. The first pressing device is a device for rolling the non-formed portion of the electrode sheet by a pair of rubber rollers. The second pressing means is a means for rolling the active material layer. The step roller pressing device presses the step roller against the non-formed portion of the electrode sheet to apply tension. The upper roller is provided with a shaft and an elastic body. The diameter of the shaft at the portion pressed against the boundary portion between the non-formed portion and the active material layer is larger than the diameter of the shaft at the portion pressed against the outside of the boundary portion. The thickness of the elastic body at the portion pressing the boundary portion is thinner than the thickness of the elastic body at the portion pressing the outside of the boundary portion.

Inventors

  • Umino Daichi
  • NAKAI HARUYA

Assignees

  • 泰星能源解决方案有限公司

Dates

Publication Date
20260508
Application Date
20251106
Priority Date
20241107

Claims (14)

  1. 1. An electrode sheet manufacturing apparatus for manufacturing an electrode sheet having a current collector, an unformed portion, and an active material layer, the current collector being made of a long metal foil, the unformed portion being set at a predetermined position in a width direction of the current collector along a longitudinal direction, the active material layer being formed at a portion of the current collector other than the unformed portion, the electrode sheet manufacturing apparatus comprising: a conveying device that conveys the electrode sheet along a predetermined conveying path; A first pressing device disposed on the transport path, the first pressing device rolling the non-formed portion of the electrode sheet with a pair of rubber rollers; a second pressing device disposed on the transport path downstream of the first pressing device for rolling the active material layer, and A step roller pressing device disposed downstream of the second pressing device on the transport path, for pressing the step roller against the non-formed portion of the electrode sheet to apply tension, The step roller has a step at a portion in contact with a boundary portion of the active material layer in the non-formed portion, and in the step roller, a diameter of the portion in contact with the non-formed portion is larger than a diameter of the portion in contact with the active material layer, At least one rubber roller of the pair of rubber rollers is provided with a shaft and an elastic body wound on the shaft, In the at least one rubber roller, the rubber roller, The diameter of the axis of the portion pressing the boundary portion between the non-formed portion and the active material layer is larger than the diameter of the axis of the portion pressing the outside of the boundary portion, The thickness of the elastic body at the portion pressing the boundary portion is smaller than the thickness of the elastic body at the portion pressing the outside of the boundary portion.
  2. 2. The electrode sheet manufacturing apparatus according to claim 1, wherein, The tension applied to the non-formed portion when the step roller is pressed against the non-formed portion is smaller than the tension applied to the non-formed portion before and after the pair of rubber rollers.
  3. 3. The electrode sheet manufacturing apparatus according to claim 1 or 2, wherein, The at least one rubber roller is provided with: A first part pressing the boundary part, and A second portion and a third portion which press the outside of the boundary portion, In said first portion, the thickness of the elastomer is fixed, In the second portion, the elastic body becomes thicker gradually from the end portion of the first portion toward the axially outer side, In the third portion, the thickness of the elastic body is fixed from the end of the second portion toward the axially outer side.
  4. 4. The electrode sheet manufacturing apparatus according to claim 3, wherein, The at least one rubber roller is disposed at a position corresponding to an end of the active material layer at an inner end, The first portion covers the boundary portion, The length of the second portion is smaller than the width of the non-formed portion, The length of the first portion and the second portion added together is 0.6 times or more and 0.85 times or less of the width of the electrode sheet and the at least one rubber roller overlapped.
  5. 5. The electrode sheet manufacturing apparatus according to claim 3, wherein, The length of at least one of the at least one rubber roller pressed against the electrode sheet and the other rubber roller is 1.2 times or more and 2.1 times or less than the width of the non-formed portion pressed against the pair of rubber rollers.
  6. 6. The electrode sheet manufacturing apparatus according to claim 5, wherein, In the second portion, the elastic body is inclined at an angle of 10 degrees or more and 25 degrees or less so as to become thicker from an end portion of the first portion toward an axially outer side.
  7. 7. The electrode sheet manufacturing apparatus according to claim 5, wherein, The thickness of the elastic body in the third portion is 1.3 times or more and 2.0 times or less than the thickness of the elastic body in the first portion.
  8. 8. A method for manufacturing an electrode sheet including a current collector formed of a long metal foil, an unformed portion set at a predetermined position in a width direction in the current collector along a longitudinal direction, and an active material layer formed in the current collector at a portion other than the unformed portion, the method comprising: A first pressing step of conveying the electrode sheet along a predetermined conveying path and rolling the non-formed portion of the electrode sheet with a pair of rubber rollers; A second pressing step of rolling the active material layer after the first pressing step, and A step roller pressing step of pressing a step roller against the non-formed portion of the electrode sheet to apply tension after the second pressing step, The step roller has a step at a portion in contact with a boundary portion of the active material layer in the non-formed portion, and in the step roller, a diameter of the portion in contact with the non-formed portion is larger than a diameter of the portion in contact with the active material layer, At least one rubber roller of the pair of rubber rollers is provided with a shaft and an elastic body wound on the shaft, In the at least one rubber roller, the rubber roller, The diameter of the axis of the portion pressing the boundary portion between the non-formed portion and the active material layer is larger than the diameter of the axis of the portion pressing the outside of the boundary portion, The thickness of the elastic body at the portion pressing the boundary portion is smaller than the thickness of the elastic body at the portion pressing the outside of the boundary portion.
  9. 9. The method for manufacturing an electrode sheet according to claim 8, wherein, In the step roller pressing step, the tension applied to the non-formed portion when the step roller is pressed against the non-formed portion is made smaller than the tension applied to the non-formed portion before and after the pair of rubber rollers.
  10. 10. The method for manufacturing an electrode sheet according to claim 8 or 9, wherein, The at least one rubber roller is provided with: A first part pressing the boundary part, and A second portion and a third portion which press the outside of the boundary portion, In said first portion, the thickness of the elastomer is fixed, In the second portion, the elastic body becomes thicker gradually from the end portion of the first portion toward the axially outer side, In the third portion, the thickness of the elastic body is fixed from the end of the second portion toward the axially outer side.
  11. 11. The method for manufacturing an electrode sheet according to claim 10, wherein, The at least one rubber roller is disposed at a position corresponding to an end of the active material layer at an inner end, The first portion covers the boundary portion, The length of the second portion is smaller than the width of the non-formed portion, The length of the first portion and the second portion added together is 0.6 times or more and 0.85 times or less of the width of the electrode sheet and the at least one rubber roller overlapped.
  12. 12. The method for manufacturing an electrode sheet according to claim 10, wherein, The length of at least one of the at least one rubber roller pressed against the electrode sheet and the other rubber roller is 1.2 times or more and 2.1 times or less than the width of the non-formed portion pressed against the pair of rubber rollers.
  13. 13. The method for manufacturing an electrode sheet according to claim 12, wherein, In the second portion, the elastic body is inclined at an angle of 10 degrees or more and 25 degrees or less so as to become thicker from an end portion of the first portion toward an axially outer side.
  14. 14. The method for manufacturing an electrode sheet according to claim 12, wherein, The thickness of the elastic body in the third portion is 1.3 times or more and 2.0 times or less than the thickness of the elastic body in the first portion.

Description

Electrode sheet manufacturing device and electrode sheet manufacturing method Technical Field The present invention relates to an electrode sheet manufacturing apparatus and an electrode sheet manufacturing method. Background Japanese patent application laid-open No. 2023-036089 discloses a method for manufacturing an electrode including an applied portion pressing step of pressing an applied portion disposed on a metal foil in a thickness direction and an uncoated portion pressing step of pressing an uncoated portion in the thickness direction. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2023-036089 Disclosure of Invention However, the inventors found that, when the electrode sheet is rolled, wrinkles occur in the electrode sheet even when the uncoated portion is pressed by a pair of elastic rollers. The electrode sheet manufacturing apparatus disclosed herein is an apparatus for manufacturing an electrode sheet having a current collector, an unformed portion, and an active material layer. The current collector is made of a long metal foil. The non-formed portion is set at a predetermined position in the width direction in the current collector along the longitudinal direction. The active material layer is formed in the current collector at a portion other than the non-formed portion. The electrode sheet manufacturing apparatus includes a conveying device, a first pressing device, a second pressing device, and a roller pressing device. The conveying device conveys the electrode sheet along a predetermined conveying path. The first pressing device is disposed on the conveying path, and presses the non-formed portion of the electrode sheet by a pair of rubber rollers. The second pressing device is disposed downstream of the first pressing device on the transport path, and presses the active material layer. The step roller pressing device is disposed downstream of the second pressing device on the conveying path, and presses the step roller against the non-formed portion of the electrode sheet to apply tension. The step roller has a step at a portion in contact with a boundary portion with the active material layer in the non-formed portion. In the step roller, the diameter of the portion in contact with the non-formed portion is larger than the diameter of the portion in contact with the active material layer. At least one rubber roller of the pair of rubber rollers is provided with a shaft and an elastic body wound around the shaft. In at least one rubber roller, the diameter of the shaft at the portion pressed against the boundary portion between the non-formed portion and the active material layer is larger than the diameter of the shaft at the portion pressed against the outside of the boundary portion. In at least one rubber roller, the thickness of the elastic body at the portion where the boundary portion is pressed is thinner than the thickness of the elastic body at the portion where the outside of the boundary portion is pressed. According to this electrode sheet manufacturing apparatus, wrinkling of the electrode sheet is easily suppressed. Drawings Fig. 1 is a flow chart of manufacturing in the method of manufacturing an electrode sheet. Fig. 2 is a schematic view of the electrode sheet 10. Fig. 3 is a schematic view showing another embodiment of the electrode sheet 10. Fig. 4 is a schematic diagram showing an example of the rolling step S6 proposed herein. Fig. 5 is a schematic view of the first pressing device 104. Fig. 6 is a schematic diagram of the step roller pressing step S6 c. Fig. 7 is a schematic view showing the elongation of the electrode sheet 10 rolled in the first pressing step S6 a. Fig. 8 is a schematic view showing the elongation of the current collector 12. Detailed Description An embodiment of the technology disclosed herein will be described below with reference to the drawings. The embodiments described herein are of course not intended to limit the invention in any particular way. The drawings are schematically depicted and do not necessarily reflect objects. The same reference numerals are given to the members and portions having the same functions, and the repetitive description thereof will be omitted as appropriate. In the present specification, the expressions "X to Y" and the like representing the numerical range mean "X or more and Y or less" unless otherwise specified. Fig. 1 is a flow chart of manufacturing in the method of manufacturing an electrode sheet. As shown in fig. 1, the method for manufacturing the electrode sheet includes a conveying step S1, a measuring step S2, a kneading step S3, a coating step S4, a drying step S5, and a rolling step S6. However, the method for manufacturing the electrode sheet may include other steps. Electrode sheet 10 Fig. 2 is a schematic view of the electrode sheet 10. The electrode sheet 10 constitutes a positive electrode sheet or a negative electrode sheet of an electrode body house