Search

CN-121986389-A - Apparatus and method for manufacturing dry film, substrate and energy storage or energy conversion system

CN121986389ACN 121986389 ACN121986389 ACN 121986389ACN-121986389-A

Abstract

The invention relates to a device (200, 300) for producing a dry film (203, 303), comprising a feeder (204, 304) for dry powder (205, 305), a powder mill (210, 310) and a roller device (220, 320). The powder mill (210, 310) has a first body (101) and a second body (201) arranged in such a way that they provide a first gap (102) between the first body (101) and the second body (201), wherein at least the first body (101) or the second body (201) is designed as a rotating body and the first gap (102) is formed to receive dry powder (205, 305) from a feeder and process it into a dry film (203, 303). The roller device (220, 320) comprises at least one roller (301), wherein the roller device (220, 320) is designed to receive the dry film (203, 303) from the powder mill (210, 310). The powder mill (210, 310) and the roller device (220, 320) are decoupled from each other.

Inventors

  • Thomas. Hukford
  • Kay Walters
  • Tosten Boeing
  • Kasten Klein Gris
  • Ronnie Schlegel

Assignees

  • 麦修斯国际有限责任公司
  • 麦修斯国际公司

Dates

Publication Date
20260505
Application Date
20240910
Priority Date
20230928

Claims (20)

  1. 1. An apparatus (200, 300) for manufacturing a dry film (203, 303), preferably for coating on a substrate, in particular a current collector, comprising: -a feeder (204, 304) for feeding dry powder (205, 305); -a powder mill (210, 310) having a first body (101) and a second body (201) arranged to form a first gap (102) between the first body (101) and the second body (201), wherein at least the first body (101) or the second body (101) is designed as a rotating body and the first gap (102) is designed to receive the dry powder (205, 305) from the feeder (204, 304) and process it into a dry film (203, 303), and Roller means (220, 320) comprising at least one roller (301), said roller means (220, 320) being designed to receive said dry film (203, 303) from said powder mill (210, 310), Characterized in that the powder mill (210, 310) and the roller device (220, 320) are decoupled from each other, preferably mechanically and/or thermally decoupled.
  2. 2. The apparatus (200, 300) of claim 1, wherein the powder mill (210, 310) is separate from the roller apparatus (220, 320).
  3. 3. The device (200, 300) according to claim 2, wherein the distance (207, 307) between the powder mill (210, 310) and the roller device (220, 320) is at least twice, preferably at least three times, and particularly preferably at least five times, the first gap (102).
  4. 4. The apparatus (200, 300) of any of the preceding claims, wherein the powder mill (210, 310) and the roller device (220, 320) have independent suspension means.
  5. 5. The apparatus (200, 300) of any of the preceding claims, wherein the powder mill (210, 310) is arranged above the roller device (220, 320).
  6. 6. The apparatus (200, 300) of any of the preceding claims, wherein the powder mill (210, 310) is adjustable relative to the roller apparatus (220, 320).
  7. 7. The apparatus (200, 300) of claim 6, wherein said powder mill (210, 310) is translatably adjustable relative to said roller means (220, 320).
  8. 8. The device (200, 300) of claim 7, wherein the powder mill (210, 310) is designed to be translatably adjustable with respect to the roller device (220, 320) such that the position at which the dry film (203, 303) contacts the roller device (220, 320) is adjustable.
  9. 9. The apparatus (200, 300) of any of claims 6 to 8, wherein the powder mill (210, 310) is rotatably adjustable relative to the roller apparatus (220, 320).
  10. 10. The apparatus (200, 300) of claim 9, wherein the powder mill (210, 310) is rotationally adjustable on a circular path (308) concentric with the at least one roller (301) of the roller arrangement (220, 320).
  11. 11. The device (200, 300) according to any one of claims 6 to 10, wherein the powder mill (210, 310) is adjustable relative to the roller device (220, 320) such that the maximum wrapping rate of the dry film (203, 303) around at least one rotation body (101, 201) of the powder mill (210, 310) and/or the at least one roller (301) of the roller device (210, 310) is greater than 10%, preferably greater than 25%, and particularly preferably greater than 50%.
  12. 12. The device (200, 300) of any of the preceding claims, wherein the first body (101) or the second body (201) of the powder mill (210, 310) is provided as a stationary body.
  13. 13. The device (200, 300) of claim 12, wherein a surface profile of the stationary body facing the first gap (102) is variable at least in a region.
  14. 14. The device (200, 300) of any one of the preceding claims, wherein the first body (101) and/or the second body (201) of the powder mill (210, 310) are designed as a belt.
  15. 15. The device (200, 300) of any of claims 1 to 11, wherein the first body (101) and the second body (201) of the powder mill (210, 310) are designed as rollers (101, 201).
  16. 16. The device (200, 300) of any of the preceding claims, wherein the dry film (203, 303) is free-standing before being received by the roller device (220, 320).
  17. 17. The apparatus (200, 300) of any of the preceding claims, wherein the powder mill (210, 310) and the roller apparatus (220, 320) are each independently temperature controllable.
  18. 18. The device (200, 300) of any of the preceding claims, wherein the first body (101) and/or the second body (102) of the powder mill (210, 310) and/or the at least one roller (301) of the roller device (220, 320) are adjustable.
  19. 19. The device (200, 300) according to any one of the preceding claims, wherein the rotational speed of at least one rotating body (101, 201) in the powder mill (210, 310) and/or the rotational speed of the at least one roller (301) of the roller device (220, 320) is adjustable.
  20. 20. The device (200, 300) according to any one of the preceding claims, comprising at least one temperature detector (801) designed for registering the temperature of the dry film (203, 303), preferably in a region between the powder mill (210, 310) and the roller device (220, 320), preferably in a region immediately before the roller device (220, 320).

Description

Apparatus and method for manufacturing dry film, substrate and energy storage or energy conversion system Technical Field The invention relates to a device and a method for producing a dry film, and to a dry film, a substrate and an energy storage or conversion system. Background In the manufacture of battery electrodes, very thin layers in the range of 50 to 100 micrometers must be applied to a metallic electrical conductor, the so-called current collector, at high speed. This can be done according to the prior art in wet or dry techniques. Wet technology requires the use of solvents that are generally not completely removed, which can adversely affect the lifetime of the electrode. In addition, the subsequent drying process increases energy consumption, making the process more complicated. For example, the drying process known from U.S. Pat. No. 3,930B 2, german patent DE 10 2017 208 220 A1 and International patent WO 2020/148410 A2 is by pressing the dry powder in a powder mill having two rotating bodies, in particular rollers. In the devices currently used, the dry film is further processed in a roller device after the powder mill. Multiple rolls in the roll apparatus can be adjusted to achieve the desired dry film density and quality. However, these devices have two disadvantages, firstly, the processing of the dry powder in the first nip requires a specific material temperature, which can have an effect on the further processing of the dry film, especially in the case of too high temperatures. However, the rollers in powder mills are generally not capable of being adjusted to the particular material temperature required to process the dry powder. Only the first roller of the roller arrangement can therefore have a different temperature, in particular a lower temperature. However, there is still a temperature in the gap between the first roller of the roller arrangement and the powder mill that is undesirable for the process. Furthermore, in the gap between the two rotating bodies of the powder mill, very high shear forces are required for processing the dry powder. This will generate vibrations which will also be transmitted to the subsequent roller arrangement. This makes it difficult, for example, to precisely adjust the gap distance and/or may cause the device to produce natural frequency excitation, thus possibly leading to problems of reduced dry film quality and/or emergency shutdown. Disclosure of Invention It is an object of the present invention to develop an apparatus and method for manufacturing a dry film to improve the control process. This object is achieved by an apparatus for producing a dry film having the features of claim 1, by a method for producing a dry film having the features of claim 30, by a dry film having the features of claim 35, by a substrate having the features of claim 36 and by an energy storage or energy conversion system having the features of claim 37. Advantageous embodiments of the invention are subject matter that may correspond to their respective affiliates. An apparatus for producing a dry film according to the invention for coating a substrate, in particular a current collector, comprises a dry powder feeder, a powder mill and a roller device. The powder mill has a first body and a second body with a first gap between them, wherein at least one of the first body or the second body can act as a rotation body. The first gap is used to receive dry powder from the feeder and process it into a dry film. The roller device has at least one roller for receiving the dry film from the powder mill. The powder mill and the roller device are decoupled (decouple)/separated from each other. By decoupling or separating the powder mill from the roller device, the present invention does not adversely affect the further processing of the dry film, for example in the roller device, or at least reduce such effects, in particular with respect to devices known in the conventional art, during the processing of the dry powder into dry film in the powder mill. In particular, the powder mill and the roller device may be arranged in a mechanical and/or thermal separation, which means that the inherent rigidity of the powder mill and, if necessary, the vibrations may be separated from the roller device, and that the transmission of vibrations between the powder mill and the roller device may be avoided or reduced. Decoupling may also prevent or at least reduce transferred heat. This in turn allows the dry film to be further processed at suitable process temperatures and/or avoids or reduces dry film defects caused by unwanted vibrations. In addition, emergency stops can be avoided or the frequency of emergency stops can be reduced. The term "body" as used herein refers to an object or component that is adapted to provide clearance from a second body. In particular, the body has material properties that allow the dry powder to be processed into a dry film. A rotating body is defined as a