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CN-117334942-B - Carbon paper hydrophobic equipment for fuel cell gas diffusion layer and preparation method

CN117334942BCN 117334942 BCN117334942 BCN 117334942BCN-117334942-B

Abstract

The invention relates to a carbon paper hydrophobic device for a gas diffusion layer of a fuel cell and a preparation method thereof. The invention comprises a hydrophobic liquid preparation system, a hydrophobic liquid drying system and a drying system, wherein the hydrophobic liquid preparation system comprises a water tank and a preparation tank which are connected, deionized water in the water tank can be conveyed into the preparation tank and mixed with PTFE solution in the preparation tank to obtain hydrophobic liquid, the hydrophobic liquid preparation system comprises a carbon paper roller conveying line, an impregnating module and a liquid rolling module which are sequentially connected, the impregnating tank is connected with the preparation tank, the hydrophobic liquid can be conveyed into the impregnating tank from the preparation tank, the carbon paper roller conveying line is used for conveying carbon paper into the impregnating tank to impregnate the carbon paper through the impregnating tank, the liquid rolling module is used for extruding redundant hydrophobic liquid from the impregnated carbon paper, and the drying system is in butt joint with the hydrophobic system to dry the carbon paper subjected to liquid rolling. The invention can realize continuous water repellency of the carbon paper to meet continuous production of the fuel cell and improve the water repellency uniformity of the gas diffusion layer in the preparation process.

Inventors

  • ZHANG LIMIN
  • GUO HAIPENG
  • LIU WENMING
  • ZHANG YIHUANG
  • GUO XIANBIN

Assignees

  • 无锡威孚高科技集团股份有限公司

Dates

Publication Date
20260508
Application Date
20231031

Claims (8)

  1. 1. A fuel cell gas diffusion layer carbon paper hydrophobic device, comprising: a hydrophobic liquid preparation system (10) comprising a water tank (11) and a preparation tank (21) which are connected, wherein deionized water in the water tank (11) can be conveyed into the preparation tank (21) and mixed with PTFE solution in the preparation tank (21) to obtain a hydrophobic liquid; the dewatering system (20) comprises a carbon paper roller conveying line (22), an impregnating module (23) and a liquid rolling module (24) which are sequentially connected, wherein the impregnating module (23) comprises an impregnating tank (23-1), the impregnating tank (23-1) is connected with the preparation tank (21), the dewatering liquid can be conveyed into the impregnating tank (23-1) by the preparation tank (21), the carbon paper roller conveying line (22) is used for conveying carbon paper into the impregnating tank (23-1) so as to impregnate the carbon paper through the impregnating tank (23-1), and the liquid rolling module (24) is used for extruding excessive dewatering liquid from the impregnated carbon paper; A drying system (30) which is in butt joint with the drainage system (20) so as to dry the rolled carbon paper; The carbon paper roller conveying line (22) comprises a conveying roller line (22-1), the conveying roller line (22-1) comprises a single roller conveying area and an upper double roller conveying area and a lower double roller conveying area, the single roller conveying area comprises a plurality of groups of single rollers which are arranged at equal intervals, the upper double roller conveying area and the lower double roller conveying area comprise a plurality of groups of upper double rollers which are arranged at equal intervals, the distance between two adjacent single rollers and between two adjacent upper double rollers is smaller than the length of carbon paper, the carbon paper is conveyed to the upper double roller conveying area and the lower double roller conveying area through the single roller conveying area and is clamped and advanced through the upper double roller and the lower double roller, the conveying roller line (22-1) comprises an inlet section which is inclined at 30-80 degrees downwards from the horizontal plane of the dipping tank (23-1), an dipping section which is parallel to the horizontal plane of the dipping tank (23-1) and an outlet section which is inclined at 30-80 degrees upwards from the horizontal plane of the dipping tank (23-1) along the conveying direction; The conveying roller line (22-1) is provided with anti-deviation baffles (22-3) on two lateral sides, a guide protection screen (22-2) is arranged below the longitudinal direction, and the horizontal plane of the guide protection screen (22-2) is lower than 3-5mm of the tangent point of the upper roller and the lower roller, so that sagging of the carbon paper due to the influence of gravity in the conveying process is avoided.
  2. 2. The carbon paper dewatering equipment for the gas diffusion layer of the fuel cell according to claim 1, wherein a first magnetic pump (12) and a first mass flowmeter (13) are sequentially connected between the water tank (11) and the preparation tank (21), and a first diaphragm pump (14) is connected between the preparation tank (21) and the dipping tank (23-1).
  3. 3. A fuel cell gas diffusion layer carbon paper drainage apparatus according to claim 1, characterized in that the preparation tank (21) is a stirred tank, and the preparation tank (21) and the impregnation tank (23-1) are each equipped with a linear density detector (15).
  4. 4. A fuel cell gas diffusion layer carbon paper dewatering device according to claim 1 or 3, characterized by further comprising a supplementary tank (16), a second magnetic pump (17) and a second mass flow meter (18) being connected between the supplementary tank (16) and the preparation tank (21).
  5. 5. The carbon paper dewatering equipment for a gas diffusion layer of a fuel cell according to claim 1, wherein the dipping tank (23-1) is provided with a waste outlet, the waste outlet is connected with a second diaphragm pump (19), the dipping tank (23-1) is provided with a cooling pipeline, a liquid level sensor, a concentration sensor and a filter, the cooling pipeline is flatly paved on the inner wall of the dipping tank (23-1) and connected to a water chiller, the liquid level sensor and the concentration sensor are all positioned in the middle of the bottom of the dipping tank (23-1) and connected to an upper computer, and the filter is positioned between the preparation tank (21) and the dipping tank (23-1) and connected by a pipeline.
  6. 6. The carbon paper dewatering equipment for a gas diffusion layer of a fuel cell according to claim 1, wherein the liquid rolling module (24) comprises a liquid rolling roller set, a scraper (24-3) is arranged on one side of a roller surface of the liquid rolling roller set, a liquid receiving box is arranged on the lower side of the liquid rolling roller set, residual solution on the liquid rolling roller set is cleaned by the scraper (24-3) and flows back into the dipping tank (23-1) after being collected by the liquid receiving box, the liquid rolling roller set comprises an upper liquid rolling roller (24-1) and a lower liquid rolling roller (24-2) which rotate relatively, and the upper liquid rolling roller (24-1) is connected with a cylinder (24-4) to adjust a gap between the upper liquid rolling roller (24-1) and the lower liquid rolling roller (24-2).
  7. 7. The carbon paper dewatering equipment for a gas diffusion layer of a fuel cell according to claim 1, wherein the drying system (30) comprises a tunnel type oven, a stainless steel mesh conveying belt (34) is arranged in the oven, a nozzle for blowing air is arranged right above the stainless steel mesh conveying belt (34), the internal temperature control range of the oven is 20-150 ℃, and the oven is heated by arranging a stainless steel electric heating pipe (33) and is exhausted by arranging an exhaust fan.
  8. 8. A method of producing a gas diffusion layer using the apparatus according to any one of claims 1 to 7, comprising: Delivering deionized water in a water tank (11) into the preparation tank (21) and mixing the deionized water with PTFE solution in the preparation tank (21) to obtain a hydrophobic liquid; -transferring the hydrophobic liquid from the preparation tank (21) into the impregnation tank (23-1); conveying the carbon paper into the impregnating tank (23-1) through a carbon paper roller conveying line (22) so as to impregnate the carbon paper through the impregnating tank (23-1); extruding redundant hydrophobic liquid of the impregnated carbon paper through a liquid rolling module (24); the rolled carbon paper is conveyed to a drying system (30) for drying by a carbon paper roller conveying line (22); And after the drying is finished, manually taking out the carbon paper and stacking.

Description

Carbon paper hydrophobic equipment for fuel cell gas diffusion layer and preparation method Technical Field The invention relates to the technical field of fuel cells, in particular to carbon paper hydrophobic equipment for a gas diffusion layer of a fuel cell and a preparation method thereof. Background The Gas Diffusion Layer (GDL) is one of the key components of a proton exchange membrane fuel cell (PEM) Membrane Electrode Assembly (MEA), with GDL performance being closely related to membrane electrode performance, which directly affects cell performance. The role of the gas diffusion layer in the fuel cell is ① to support the catalytic layer, stabilize the electrode structure, ② to provide gas, electron, and water drainage channels for the electrode reaction, ③ to transfer reactants (fuel and catalyst), ④ to ensure electrical conductivity between the bipolar plate and the catalytic layer. When the fuel cell generates electricity, the anode generates hydrogen oxidation reaction to generate protons and electrons, the generated electrons reach the cathode through an external circuit, the generated protons are transferred to the cathode through the proton exchange membrane, and the cathode oxygen obtains electrons and reacts with the protons to generate water. The generated water needs to be rapidly discharged through the gas diffusion layer, and if the gas diffusion layer cannot rapidly discharge the water, the generated water can cause flooding of the catalytic layer, so that the further progress of the reaction is affected. The existing gas diffusion layer preparation methods are two, namely coil preparation, mass production scale comparison, equipment volume enlargement, high cost, a water drain tank and a drying oven which are long enough to meet the product requirement, one production line is tens of meters long, and sheet preparation, manual batching, manual dipping and manual drying are adopted, so that the preparation is generally used for laboratory property preparation, and the efficiency and the yield are low. Disclosure of Invention Therefore, the invention provides the carbon paper hydrophobic equipment for the gas diffusion layer of the fuel cell and the preparation method thereof, which can realize continuous hydrophobic of the carbon paper to meet continuous production of the fuel cell, can realize automatic hydrophobic of the carbon paper of the gas diffusion layer, have higher working efficiency, save manpower and improve hydrophobic uniformity of the gas diffusion layer in the preparation process. In order to solve the above technical problems, the present invention provides a carbon paper hydrophobic device for a gas diffusion layer of a fuel cell, comprising: The deionized water in the water tank can be conveyed into the preparation tank and mixed with the PTFE solution in the preparation tank to obtain a hydrophobic liquid; The dewatering system comprises a carbon paper roller conveying line, an impregnating module and a liquid rolling module which are sequentially connected, wherein the impregnating module comprises an impregnating tank, the impregnating tank is connected with the preparation tank, and the hydrophobic liquid can be conveyed into the impregnating tank from the preparation tank; And the drying system is in butt joint with the drainage system so as to dry the rolled carbon paper. In one embodiment of the present invention, a first magnetic pump and a first mass flowmeter are sequentially connected between the water tank and the preparation tank, and a first diaphragm pump is connected between the preparation tank and the immersion tank. In one embodiment of the present invention, the preparation tank is a stirred tank, and the preparation tank and the immersion tank are each provided with a linear density detector. In one embodiment of the present invention, the magnetic pump further comprises a replenishing tank, and a second magnetic pump and a second mass flowmeter are connected between the replenishing tank and the preparation tank. In one embodiment of the invention, the dipping tank is provided with a waste discharge port, the waste discharge port is connected with a second diaphragm pump, the dipping tank is provided with a cooling pipeline, a liquid level sensor, a concentration sensor and a filter, the cooling pipeline is horizontally paved on the inner wall of the dipping tank and is connected to a water chiller, the liquid level sensor and the concentration sensor are all positioned in the middle of the bottom of the dipping tank and are connected to an upper computer, and the filter is positioned between the preparation tank and the dipping tank and is connected by a pipeline. In one embodiment of the invention, the carbon paper roller conveying line comprises a conveying roller line, the conveying roller line comprises a single roller conveying area and an upper double roller conveying area and a lower double roller conveying area, the single roller conveyi