Etching processing method of conductive partition plate with gas-liquid distribution flow field

Abstract

The invention relates to a conductive partition plate with a gas-liquid redistribution flow field structure and a processing method thereof, wherein the functional partitions such as the sealant line groove, the diversion groove, the gas channel, and the liquid channel are integrated into the same component, and are integrated forming. Compared with the conductive separation plate processed by the traditional technology, the present invention reduces the number of processing times and reduces the processing difficulty, so that the manufacture of the conductive separation plate, the assembly quality of the stack and the positioning accuracy are all guaranteed. The conductive separation plate processed by the present invention does not need to separately reinforce the sealant groove, and can ensure the operation stability of the electrolytic cell under the working condition of producing high-pressure hydrogen (>3.5MPa). Compared with the prior art, the conductive separation plate processed by the technical solution has a simple structure, convenient and reliable installation, reduces the processing steps, and improves the structural reliability.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a conductive partition plate with a gas-liquid redistribution flow field structure. Background technique [0002] The conductive separator is one of the core components of the electrolytic hydrogen production cell, which directly affects the electrolysis efficiency, electrolysis energy consumption, electrolysis cost and the life of the electrolysis cell. [0003] The structure of the existing conductive partition plate for hydrogen production by water electrolysis is relatively complex, including multiple structural modules such as main body, plate frame assembly, and sealing structure. These structural modules are often processed separately as individual components. This kind of conductive partition board has a complex processing process and high positioning accuracy requirements, which brings a lot of inconvenience to the mass production and ...

AI Technical Summary

Problems solved by technology

This kind of conductive partition board has complex processing process and high positioning accuracy requirements, which brings a lot of inconvenience to the mass production and assembly of conductive partition boards

In addition, as an independently processed plate and frame assembly, it needs to be bonded and welded to maintain connection with the main body of the conductive partition. This type of connection will cause problems such as weak connection and excessive deformation of the flatness of the conductive partition. Electrolytic cells run under heated, high-pressure operating conditions

[0004] Specifically, the existing conductive partitions for water electrolysis mainly have the following problems: 1. The plate and frame components of the conductive partition need to be processed separately, causing the plate and frame components and the main body of the conductive partition to be repeatedly processed, resulting in high processing costs. Increase; 2. The position of the positioning hole of the conductive partition plate and the positioning accuracy of the positioning hole of the main body of the conductive partition plate are required to be high, resulting in high assembly difficulty; 3. The existing conductive partition board sealant line groove needs to be bonded , or welding, which complicates the processing process of the conductive separator, and cannot guarantee the reliability of the sealing function of the conductive separator under the high-voltage operation of the electrolytic cell; 4. In the stack of the filter press structure, There are many sealing interfaces of the equipment, and the risk of material leakage inside the stack is high

The conductive separators prepared by the existing whole-board preparation process of conductive separators are used in fuel cells, mostly in the form of stamping and molding. Stamping and molding will cause corresponding grooves and ridges on both sides of the whole board. The structure is not suitable for water electrolysis

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