Fuel cell voltage attenuation quick determination method and device

Abstract

The present invention discloses a quick voltage attenuation measuring method and the device thereof for the fuel cell, and belongs to the clean energy technology field. The quick measuring device is used to respectively connect the test circuit of the fuel cell to be tested and the sub-circuit of a reference cell with the in-phase input terminal and the reversed phase input terminal of a differential amplifier, and to connect the output terminal of the differential amplifier with a microprocessor. The quick measuring method is used to first determine the voltage attenuation and the power attenuation as a physical quantity for representing the service life or the durability of the fuel cell, to transform the measuring object from the output voltage of a single-plate or a galvanic pile intothe attenuation or the relative attenuation of the output voltage of the single-plate or the galvanic pile at the front stage, and to measure the attenuation of the output voltage directly, and a normal precise amplifier and a simulated switch can be adopted at the back stage; the output of the differential amplifier can be send to the microprocessor for a further process after being transformed by the modulus, thus the voltage attenuation and the power attenuation of the fuel cell to be tested can be obtained for estimating the service life or the durability of the fuel cell.

Description

technical field The invention belongs to the technical field of clean energy, and in particular relates to a fuel cell voltage decay rapid measurement method and device related to proton exchange membrane fuel cell durability, life evaluation technology and fuel cell optimization control and management. Background technique In practical applications, fuel cell products usually need to connect multiple single-piece fuel cell units in series. The structure is that multiple single-piece stacks are assembled into a whole, which is called a fuel cell stack. The single pieces are usually connected in series. , share a set of fuel inlet and outlet and cooling water inlet and outlet. The output current of the electric stack is drawn from the monoliths at both ends of the electric stack. The voltage of the stack is equal to the sum of the voltages of the individual monoliths connected in series. According to the theory of mathematical statistics and reliability, it can be known th...

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Problems solved by technology

Its disadvantage is that it is difficult to achieve high resolution / accuracy / stability in a large range, and if the performance is to be improved, the cost will rise sharply

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