Flow field plate for measuring fuel battery local current density

Abstract

The invention belongs to the field of fuel cells, mainly relates to the field of the internal current measurement of the fuel cells, and discloses a fuel cell current density measurement flow field plate. The fuel cell current density measurement flow field plate comprises a PCB board (1); gas flow channels (2) are engraved on the PCB board (1); a plurality of mutually independent metal plating layer areas (4) are arranged on ribs (3) among the gas flow channels (2); connecting points (5) are arranged on the metal plating layer areas (4); a guide wire (6) is arranged on the back surface of the PCB board (1); one end of the guide wire (6) is electrically connected with one metal plating layer area (4) through the connecting point (5), and the other end of the guide wire (6) is converged on a terminal block (9) through a resistor (7). The use of flow field plate for the measurement of the local current of the fuel cell can allow the regional division to be more detailed and realize the measurement of the two-dimensional local current measurement, the structure is simple, the use is convenient, and the processing cost is low.

Description

technical field [0001] The invention belongs to the field of fuel cells, and mainly relates to the field of measuring the internal current of the fuel cell, in particular to a flow field plate for measuring the local current density of the fuel cell. technical background [0002] As a new type of power generation device, proton exchange membrane fuel cell has been paid more and more attention by various countries. The structure of the proton exchange membrane fuel cell includes: cathode and anode flow field plates, sealing gaskets and membrane electrodes (MEA). The membrane electrode (MEA) consists of a diffusion layer, a catalytic layer and a polymer membrane. The diffusion layer is generally carbon paper or carbon cloth, and the catalytic layer is platinum / carbon particles. The fuel of this battery is hydrogen, the oxidant is oxygen or air, hydrogen is decomposed into protons and electrons in the anode catalytic layer, protons reach the cathode through the proton exchange...

AI Technical Summary

Problems solved by technology

It also has some disadvantages. First of all, it is very difficult to process. It is necessary to fix the copper block on the PCB, and then process the flow channel on the copper block, and ensure that all the end faces of the copper block are on the same plane.

In the entire flow field board structure, the PCB board is only responsible for deriving the current and voltage behind the independent copper block, that is, the PCB board is not in contact with the flow field, and the two are independent of each other. The flow channels and conductive ribs are all processed on the copper block. Therefore, the contact resistance of the wires on the surface of the PCB board and the copper block will cause measurement errors; secondly, the diffusion layer and the catalytic layer need to be divided, so that the structure of the electrode changes and introduces measurement errors

Images