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CN-122025514-A - Device and method for processing and producing electrode film of solid-state battery

CN122025514ACN 122025514 ACN122025514 ACN 122025514ACN-122025514-A

Abstract

The invention relates to the field of battery manufacturing, in particular to a device and a method for processing and producing an electrode film of a solid-state battery. The device comprises a drying box, a winding and unwinding assembly, a pressure roller assembly, a control assembly, a temperature control system and the like. The method comprises the steps of firstly carrying out unidirectional transmission drying on an electrode film to a semi-dry state under a micro-positive pressure inert atmosphere, then switching the transmission direction, carrying out first low-pressure roller pressing under the semi-dry state, then carrying out multiple-time roller pressing with gradual boosting through multiple-time reciprocating transmission according to the requirement, and finally completing drying. The invention integrates drying and multistage rolling, and solves the problems of atmosphere pollution caused by material transfer, insufficient particle crushing or densification caused by single full-dry rolling and the like in the traditional process.

Inventors

  • Bai Qingru
  • LIU XIAOLEI
  • JIANG YONG

Assignees

  • 中宸距弛(甘肃)新能源有限公司

Dates

Publication Date
20260512
Application Date
20260107

Claims (10)

  1. 1. The device for processing and producing the solid-state battery electrode film is characterized by comprising a drying box (1), wherein the drying box (1) comprises a winding and unwinding assembly, a pressure roller assembly, a control assembly (3) and a temperature control system, and the temperature control system comprises a temperature sensor and a heating pipe; The winding and unwinding assembly comprises a supporting frame (7), the supporting frame (7) is connected with a drying oven (1), the supporting frame (7) is rotationally connected with a rotating shaft (10), the rotating shaft (10) is rotationally and hermetically connected with the drying oven (1), the drying oven (1) is connected with a motor (14), the rotating shaft (10) is connected with the output end of the motor (14), the winding and unwinding assembly is provided with two groups, the two rotating shafts (10) are respectively connected with a first winding shaft (6) and a second winding shaft (11), and the first winding shaft (6) and the second winding shaft (11) are respectively detachably connected with a material roll and a winding drum; The pressure roller assembly comprises a vertical frame (8), the vertical frame (8) is connected with a drying oven (1), the vertical frame (8) is rotationally connected with a driven roller (9), the vertical frame (8) is slidably connected with a sliding block (12), the sliding block (12) is rotationally connected with a pressure roller (15), the sliding block (12) is connected with a pressing block (13), the drying oven (1) is connected with an electric telescopic rod (2), and the telescopic end of the electric telescopic rod (2) is connected with the pressing block (13).
  2. 2. The device for processing and producing the electrode film of the solid-state battery, as set forth in claim 1, is characterized in that the rotating shaft (10) is rotatably connected with a double-end-face mechanical seal assembly, the double-end-face mechanical seal assembly is connected with the drying box (1), a sliding seal sleeve is arranged at a penetrating sliding position between the telescopic end of the electric telescopic rod (2) and the drying box (1), the stand (8) is connected with a guide plate (5), the sliding block (12) is provided with a guide chute, the guide plate (5) is embedded into the guide chute, and the side wall of the guide chute is in sliding fit connection with the guide plate (5).
  3. 3. The device for processing and producing the electrode film of the solid-state battery, as set forth in claim 1, is characterized in that the inner container of the drying box (1) is made of 316L stainless steel, the inner wall is polished, the roughness Ra is less than or equal to 0.8 mu m, the drying box (1) is rotatably connected with a box door (4), the box door (4) is connected with a fluororubber sealing rubber ring, the heating pipe and the temperature sensor are respectively embedded into the side wall of the drying box (1), the heating pipe is used for heating the interior of the box, and the temperature sensor is used for monitoring the temperature in the box.
  4. 4. The device for processing and producing the solid battery electrode film is characterized in that the pressure roller (15) and the driven roller (9) are made of zirconia ceramic, the roller surface roughness Ra of the pressure roller (15) and the driven roller (9) is less than or equal to 0.2 mu m, a heating element is arranged in the pressure roller (15), the heating element is an armored heating rod, the armored heating rod is a 316L stainless steel package, a nickel-chromium heating wire and magnesium oxide are arranged in the armored heating rod in an insulating mode, a rotary conductive slip ring is arranged at one end portion of the pressure roller (15), a lead wire of the armored heating rod is led out through the rotary conductive slip ring, the lead wire is prevented from winding when the pressure roller (15) rotates, and the rotary conductive slip ring is electrically connected with a temperature control system.
  5. 5. The device for processing and producing the electrode film of the solid-state battery according to claim 1, wherein a nitrogen inlet port is arranged at the top of the drying box (1), the nitrogen inlet port is provided with a flow controller, the replacement of air in the box can be realized, the micro positive pressure of 0.005-0.01MPa is maintained in the drying and rolling processes, and the flow controller is electrically connected with the control assembly (3).
  6. 6. The device for processing and producing the solid-state battery electrode film according to claim 1, wherein the control assembly (3) comprises a touch screen and a control button, the control assembly (3) is connected with the drying box (1) and can preset drying temperature, rolling pressure and transmission speed parameters, and the control assembly is electrically connected with the motor (14), the electric telescopic rod (2) and the temperature control system to realize linkage control.
  7. 7. The device for processing and producing the electrode film of the solid-state battery according to claim 1, wherein the material roll and the winding drum are respectively connected with bolts in a threaded manner, the first winding drum (6) and the second winding drum (11) are respectively provided with mounting holes, the bolts are in threaded connection with the mounting holes, flat pasting areas are reserved on the outer peripheral surfaces of the material roll and the winding drum, the roughness Ra of the flat pasting areas is less than or equal to 1.6 mu m, the flat pasting areas are used for pasting and fixing the end parts of the electrode coating film through adhesive tapes, and the adhesive tapes adopt high-temperature-resistant polyimide adhesive tapes.
  8. 8. A method for producing a solid-state battery electrode film, for use in the apparatus for producing a solid-state battery electrode film according to any one of claims 1 to 7, comprising the steps of: S1, feeding and installing, namely installing a material roll on a first reel (6), installing a winding drum on a second reel (11), dragging the initial end of an electrode coating film to bypass the gap between a pressure roller (15) and a driven roller (9), and finally flatly attaching the initial end to a flatly attaching area of the winding drum, attaching and compacting the initial end in the width direction of a film layer by adopting an adhesive tape, and attaching the adhesive tape to the back of a current collector of the electrode coating film to finish the fixation of the electrode coating film and the winding drum; S2, one-way semi-drying, namely closing a box door (4), firstly filling high-purity nitrogen into a drying box (1) to normal pressure through a nitrogen inlet, repeating the process for 1-2 times to fully replace air, then adjusting a flow controller to maintain the environment in the box at a nitrogen micro-positive pressure state of 0.005-0.01MPa, starting a temperature control system to set the drying temperature to 80-120 ℃, and synchronously rotating a motor (14) of a first reel (6) and a second reel (11) at the same speed to enable the second reel (11) to roll an electrode coating film, wherein the transmission speed is 1-2m/min, the drying time is 1-2 hours until the solvent residue is less than or equal to 5%, and the pressure roller (15) is kept in a lifted state, and the gap between the pressure roller and a driven roller (9) is more than or equal to 5mm; S3, reverse rolling activation, namely switching two motors (14) to turn through a control assembly (3), so that a first reel (6) and a second reel (11) are reversely driven, at the moment, an electric telescopic rod (2) pushes a sliding block (12) to move downwards, a pressure roller (15) is driven to pressurize according to a gradient of 0.5MPa to 2MPa, in the process, the micro-positive pressure inert atmosphere established in the S2 and the preset drying temperature are maintained to continuously work, and secondary drying and primary rolling are completed in the reverse transmission process, wherein the solvent residue is less than or equal to 1%, and the temperature of the pressure roller (15) and the drying temperature are kept consistent in the rolling process; S4, reciprocating optimization and final drying, namely setting a pressure roller (15) to roll through a control assembly (3) for 1-3 times according to the density requirement of the electrode film, switching the motor (14) to turn each time, gradually adjusting the pressure to 3-5 MPa, maintaining the transmission speed of each time to be 1-2m/min, maintaining the micro-positive pressure inert atmosphere and the drying temperature in the whole reciprocating process and the subsequent final drying stage, and maintaining the drying temperature and the micro-positive pressure inert atmosphere to carry out final drying for 0.5-1 hour after the reciprocating rolling is finished, so that the solvent residue is less than or equal to 0.1%, thereby finishing the electrode film processing.
  9. 9. A method for producing an electrode film for a solid-state battery according to claim 8, further comprising, before said step S1, an initial curing step of passing said electrode coating film through a preheating zone so that the surface layer slurry thereof forms a dry film shell having self-supporting strength, and then winding it to form a roll carrying the electrode coating film, said roll being mounted in said step S1.
  10. 10. The method for producing a solid-state battery electrode film according to claim 8, wherein the temperature of the pressure roller (15) is kept at the same level as the drying temperature and the transfer speed is maintained at 1-2m/min each time of reciprocal rolling in the steps S3 and S4.

Description

Device and method for processing and producing electrode film of solid-state battery Technical Field The invention relates to the field of battery manufacturing, in particular to a device and a method for processing and producing an electrode film of a solid-state battery. Background Solid-state batteries become one of the core development directions of next-generation energy storage devices due to the advantages of high energy density, good safety, long cycle life and the like. The electrode film is used as a core component of the solid-state battery, and the processing quality of the electrode film directly determines the electrochemical performance and service stability of the battery. The traditional rolling method is single and fixed pressure compacting, and is difficult to carry out targeted optimization according to the shrinkage characteristics and mechanical strength of the electrode film in different drying stages. Brittle solid electrolyte particles are easily crushed when the pressure is too high, and the compactness is insufficient when the pressure is too low. Disclosure of Invention The present invention is intended to provide an apparatus and a method for processing and producing an electrode film of a solid-state battery, which solve the problems set forth in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: the device for processing and producing the solid-state battery electrode film comprises a drying box, wherein the drying box comprises a winding and unwinding assembly, a pressure roller assembly, a control assembly and a temperature control system, and the temperature control system comprises a temperature sensor and a heating pipe; The winding and unwinding assembly comprises a supporting frame, the supporting frame is connected with a drying box, the supporting frame is rotationally connected with a rotating shaft, the rotating shaft is rotationally and hermetically connected with the drying box, the drying box is connected with a motor, the rotating shaft is connected with an output end of the motor, the winding and unwinding assembly is provided with two groups, the two rotating shafts are respectively connected with a first winding shaft and a second winding shaft, and the first winding shaft and the second winding shaft are respectively and detachably connected with a material winding drum and a winding drum; The pressure roller assembly comprises a vertical frame, the vertical frame is connected with a drying oven, the vertical frame is rotationally connected with a driven roller, the vertical frame is in sliding connection with a sliding block, the sliding block is rotationally connected with a pressure roller, the sliding block is connected with a pressing block, the drying oven is connected with an electric telescopic rod, and the telescopic end of the electric telescopic rod is connected with the pressing block. The rotary shaft is rotatably connected with a double-end-face mechanical sealing assembly, the double-end-face mechanical sealing assembly is connected with the drying box, a sliding sealing sleeve is arranged at a penetrating sliding position of a telescopic end of the electric telescopic rod and the drying box, the vertical frame is connected with a guide plate, the sliding block is provided with a guide chute, the guide plate is embedded into the guide chute, and the side wall of the guide chute is in sliding fit connection with the guide plate. Preferably, the inner container of the drying box is made of 316L stainless steel, the inner wall is polished, the roughness Ra is less than or equal to 0.8 mu m, the drying box is rotationally connected with a box door, the box door is connected with a fluororubber sealing rubber ring, the heating pipe and the temperature sensor are respectively embedded into the side wall of the drying box, the heating pipe is used for heating the inside of the box, and the temperature sensor is used for monitoring the temperature in the box. Preferably, the pressure roller and the driven roller are made of zirconia ceramic, the roughness Ra of the roller surfaces of the pressure roller and the driven roller is less than or equal to 0.2 mu m, a heating element is arranged in the pressure roller, the heating element is an armored heating rod, the armored heating rod is in 316L stainless steel packaging, a built-in nickel-chromium heating wire and magnesium oxide are filled in an insulating manner, a rotary conductive slip ring is arranged at one end part of the pressure roller, a lead wire of the armored heating rod is led out through the rotary conductive slip ring, the lead wire is prevented from winding when the pressure roller rotates, and the rotary conductive slip ring is electrically connected with a temperature control system. Preferably, a nitrogen inlet interface is arranged at the top of the drying box, the nitrogen inlet interface is provided with a f