CN-121973538-A - Preparation equipment and method for dry intermittent coating type pole piece

CN121973538ACN 121973538 ACN121973538 ACN 121973538ACN-121973538-A

Abstract

The invention relates to the technical field of lithium battery manufacturing, in particular to equipment and a method for preparing a dry intermittent coating type pole piece. The dry intermittent coating type pole piece preparation equipment comprises a film supply device, an unreeling device and a covering device, wherein the unreeling device is used for supplying a first current collector and a second current collector, the covering device comprises a first covering station and a second covering station, the first covering station is used for receiving a first continuous film and the first current collector and performing first covering, and the second covering station is used for receiving the first current collector and the second current collector after the first covering and performing second covering. Through accurate alignment during secondary coating, the membrane in the weak bonding area is directly transferred to the strong bonding area of another current collector on line, so that two intermittent coating pole pieces with complete patterns are synchronously formed in one step.

Inventors

ZHANG TONG
XIE CHENLIN
WEN PENGCHAO
KONG SHAOFENG

Assignees

奇瑞汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. The preparation equipment of the dry intermittent coating type pole piece is characterized by comprising a film supply device, an unreeling device and a laminating device; The film supply device is used for supplying a first continuous film; The unreeling device is used for supplying a first current collector and a second current collector, and the surfaces of the first current collector and the second current collector are alternately provided with a bottom coating region (11) and a blank region (12) along the length direction; The coating device comprises a first coating station and a second coating station, wherein the first coating station is used for receiving the first continuous membrane and the first current collector and carrying out first coating, the second coating station is used for receiving the first current collector and the second current collector after the first coating and carrying out second coating, a blank area (12) of the second current collector is opposite to a prime coating area (11) of the first current collector during the second coating, and the prime coating area (11) of the second current collector is opposite to the blank area (12) of the first current collector so as to obtain two single-sided intermittent coating pole pieces with the membrane covered by the prime coating area (11) of the first current collector and the prime coating area (11) of the second current collector.
2. The apparatus for preparing a dry intermittent coated pole piece according to claim 1, wherein the film supplying means is further adapted to supply a second continuous film; the unreeling device is also used for supplying a third current collector, and the surface of the third current collector is alternately provided with a bottom coating region (11) and a blank region (12) along the length direction; The laminating device further comprises a third laminating station and a fourth laminating station, wherein the third laminating station is used for receiving one of the second continuous film and the two single-sided intermittent coating pole pieces and laminating the second continuous film and the two single-sided intermittent coating pole pieces for the third time, the fourth laminating station is used for receiving the single-sided intermittent coating pole pieces and the third current collector after the third laminating and laminating the fourth current collector for the fourth time, when the fourth laminating is performed, a blank area (12) of the third current collector is opposite to a base coat area (11) of the single-sided intermittent coating pole pieces, the blank area (11) of the third current collector is opposite to the blank area (12) of the single-sided intermittent coating pole pieces, so that the double-sided intermittent coating pole pieces with the film are laminated on two sides of the base coat area (11) of the single-sided intermittent coating pole pieces, and the other single-sided intermittent coating pole pieces with the film are laminated on the base coat area (11) of the third current collector.
3. The apparatus for producing a dry-process intermittently coated pole piece according to claim 2, wherein the unreeling device is further configured to separately supply a single-sided intermittently coated pole piece as the third current collector, wherein, at the time of the fourth coating, the single-sided intermittently coated pole piece separately supplied is opposed to the single-sided intermittently coated pole piece subjected to the third coating with one side thereof not coated with a film, and a blank area (12) thereof is opposed to a primer area (11) of the single-sided intermittently coated pole piece, and the blank area (11) thereof is opposed to the blank area (12) of the single-sided intermittently coated pole piece, so as to obtain a double-sided intermittently coated pole piece with both sides of the two-sided primer areas (11) coated with a film sheet.
4. A dry intermittent coated pole piece manufacturing apparatus according to any of claims 1-3, characterized in that the film feeding means comprises a feeding assembly (1) and a film forming roll set (2), the feeding assembly (1) being adapted to feed dry powder and the film forming roll set (2) being adapted to roll the dry powder into a continuous film.
5. A dry intermittent coated pole piece manufacturing apparatus as claimed in any one of claims 1-3, further comprising a winding device for winding the formed intermittent coated pole piece.
6. A device for preparing a dry intermittent coated pole piece according to any of claims 1-3, characterized in that the laminating means comprises at least one laminating roller set (3), the roller gap in the laminating roller set (3) being used to form a laminating station.
7. The apparatus for producing a dry intermittent coated pole piece according to any one of claims 1 to 3, further comprising at least one of a trimming device, a scrap recycling device, a transfer roller device, a thickness areal density detecting device, a tension controlling device, a defect detecting device, and an alignment controlling device.
8. A method for preparing a dry intermittent coating type pole piece, characterized in that the preparation device of the dry intermittent coating type pole piece according to claim 1 is adopted, and the preparation method of the dry intermittent coating type pole piece comprises the following steps: Feeding the first continuous film sheet through a film feeding device; the first current collector and the second current collector are supplied through the unreeling device, and the surfaces of the first current collector and the second current collector are alternately provided with a bottom coating region (11) and a blank region (12) along the length direction; At a first lamination station of the lamination device, performing first lamination on the first continuous membrane and the first current collector; And in a second lamination station of the lamination device, carrying out second lamination on the first current collector and the second current collector after the first lamination, and enabling a blank area (12) of the second current collector to be opposite to a prime coating area (11) of the first current collector, wherein the prime coating area (11) of the second current collector is opposite to the blank area (12) of the first current collector, so that two single-sided intermittent coating pole pieces with the diaphragms are laminated on the prime coating area (11) of the first current collector and the prime coating area (11) of the second current collector.
9. A method for preparing a dry intermittent coating type pole piece, characterized in that the preparation device of the dry intermittent coating type pole piece according to claim 2 is adopted, and the preparation method of the dry intermittent coating type pole piece comprises the following steps: Feeding the first continuous film sheet through a film feeding device; the first current collector and the second current collector are supplied through the unreeling device, and the surfaces of the first current collector and the second current collector are alternately provided with a bottom coating region (11) and a blank region (12) along the length direction; At a first lamination station of the lamination device, performing first lamination on the first continuous membrane and the first current collector; In a second lamination station of the lamination device, the first current collector after the first lamination is subjected to the second lamination with the second current collector, a blank area (12) of the second current collector is opposite to a prime coating area (11) of the first current collector, the prime coating area (11) of the second current collector is opposite to the blank area (12) of the first current collector, and two single-sided intermittent coating pole pieces with membrane sheets are coated on the prime coating area (11) of the first current collector and the prime coating area (11) of the second current collector; Feeding a second continuous film sheet through a film feeding device; the third current collector is supplied by an unreeling device, and the surface of the third current collector is alternately provided with a bottom coating region (11) and a blank region (12) along the length direction; In a third lamination station of the lamination device, carrying out third lamination on the second continuous membrane and one of the two obtained single-sided intermittent coating pole pieces; And in a fourth coating station of the coating device, coating the single-sided intermittent coating pole piece subjected to the third coating with a third current collector for the fourth time, enabling a blank area (12) of the third current collector to be opposite to a prime coating area (11) of the single-sided intermittent coating pole piece subjected to the third coating, enabling the prime coating area (11) of the third current collector to be opposite to the blank area (12) of the single-sided intermittent coating pole piece subjected to the third coating, and obtaining a double-sided intermittent coating pole piece with both sides of the prime coating area (11) of the single-sided intermittent coating pole piece coated with a membrane and another single-sided intermittent coating pole piece with the membrane coated by the prime coating area (11) of the third current collector.
10. A method for preparing a dry intermittent coating type pole piece, characterized in that the preparation device of the dry intermittent coating type pole piece according to claim 3 is adopted, and the preparation method of the dry intermittent coating type pole piece comprises the following steps: Feeding the first continuous film sheet through a film feeding device; the first current collector and the second current collector are supplied through the unreeling device, and the surfaces of the first current collector and the second current collector are alternately provided with a bottom coating region (11) and a blank region (12) along the length direction; At a first lamination station of the lamination device, performing first lamination on the first continuous membrane and the first current collector; In a second lamination station of the lamination device, the first current collector after the first lamination is subjected to the second lamination with the second current collector, a blank area (12) of the second current collector is opposite to a prime coating area (11) of the first current collector, the prime coating area (11) of the second current collector is opposite to the blank area (12) of the first current collector, and two single-sided intermittent coating pole pieces with membrane sheets are coated on the prime coating area (11) of the first current collector and the prime coating area (11) of the second current collector; Feeding a second continuous film sheet through a film feeding device; a piece of single-sided intermittent coating pole piece is independently supplied by an unreeling device; In a third lamination station of the lamination device, carrying out third lamination on the second continuous membrane and one of the two obtained single-sided intermittent coating pole pieces; And in a fourth coating station of the coating device, coating the single-sided intermittent coating pole piece subjected to the third coating with the single-sided intermittent coating pole piece which is independently supplied for the fourth time, enabling a blank area (12) of the single-sided intermittent coating pole piece which is independently supplied to be opposite to a base coating area (11) of the single-sided intermittent coating pole piece subjected to the third coating, and enabling the base coating area (11) of the single-sided intermittent coating pole piece which is independently supplied to be opposite to the blank area (12) of the single-sided intermittent coating pole piece which is subjected to the third coating, so as to obtain the double-sided intermittent coating pole piece with two sides of the base coating area (11) coated with the membrane.

Description

Preparation equipment and method for dry intermittent coating type pole piece Technical Field The invention relates to the technical field of lithium battery manufacturing, in particular to equipment and a method for preparing a dry intermittent coating type pole piece. Background The dry electrode process is used as a solvent-free pole piece production technology, and has the potential advantages of environmental protection, low cost, high energy density and the like. However, the existing dry process generally can only produce a pole piece (continuous coated pole piece) with an active material layer continuously coated on the surface of a current collector, and it is difficult to directly prepare a coated intermittent coated pole piece. In the prior art, although a scheme is tried to realize dry intermittent coating by cutting redundant films after pre-gluing and compounding on a current collector, the scheme introduces a high-precision cutting procedure, so that equipment is complex, waste materials are generated, the edges of pole pieces are possibly damaged, and the production cost and the quality control difficulty are increased. Therefore, a new technical scheme capable of directly, efficiently and non-waste preparing the dry intermittent coating type pole piece is needed. Disclosure of Invention The invention aims to provide a preparation device and a preparation method for a dry intermittent coating type pole piece, which are used for solving the technical problems of complex equipment, material waste, potential quality risk, low efficiency and the like caused by the fact that the existing dry process is required to depend on a subsequent cutting procedure when the intermittent coating pole piece is prepared. In a first aspect, the invention provides a preparation device of a dry intermittent coating type pole piece, which comprises a film supply device, an unreeling device and a laminating device; The film supply device is used for supplying a first continuous film; The unreeling device is used for supplying a first current collector and a second current collector, and the surfaces of the first current collector and the second current collector are alternately provided with a bottom coating region and a blank region along the length direction; The coating device comprises a first coating station and a second coating station, wherein the first coating station is used for receiving the first continuous membrane and the first current collector and carrying out first coating, the second coating station is used for receiving the first current collector and the second current collector after the first coating and carrying out second coating, a blank area of the second current collector is opposite to a base coat area of the first current collector during the second coating, and the base coat area of the second current collector is opposite to the blank area of the first current collector so as to obtain two single-sided intermittent coating pole pieces with the membrane covered on the base coat area of the first current collector and the base coat area of the second current collector. In an alternative embodiment, the film supply device is further configured to supply a second continuous film sheet; The unreeling device is also used for supplying a third current collector, and the surface of the third current collector is alternately provided with a bottom coating region and a blank region along the length direction; The laminating device further comprises a third laminating station and a fourth laminating station, wherein the third laminating station is used for receiving one of the second continuous film and the two single-sided intermittent coating pole pieces and laminating for the third time, the fourth laminating station is used for receiving the single-sided intermittent coating pole pieces and the third current collector after lamination for the third time and laminating for the fourth time, when lamination is performed for the fourth time, the blank area of the third current collector is opposite to the base coat area of the single-sided intermittent coating pole pieces, the base coat area of the third current collector is opposite to the blank area of the single-sided intermittent coating pole pieces, so that the double-sided intermittent coating pole pieces with the films are laminated on two sides of the base coat area of the single-sided intermittent coating pole pieces, and the other single-sided intermittent coating pole pieces with the films are laminated on the base coat area of the third current collector. In an alternative embodiment, the unreeling device is further used for separately supplying a single-sided intermittent coating pole piece as the third current collector, wherein during the fourth coating, one side of the single-sided intermittent coating pole piece which is not coated with a film is opposite to the single-sided intermittent coating pole piece which is coated with th