Single slice battery essential resistance and voltage on-line testing system for fuel cell pile

Abstract

The invention relates to an online system for testing the essential resistance and the voltage of a single cell of a fuel cell stack, comprising a testing unit, a programmed AC driving source, a blocking condenser, an electric current detecting module, a keyboard, an LCD unit and a storage unit, which is characterized in that the programmed AC driving source is serially connected with the blocking condenser and then parallel connected with an output end of a fuel cell, and the testing unit is used for controlling the frequency and the amplitude value of the AC driving source periodically through a communication interface and collecting the voltage and the electric current signals of each single cell in order for computing essential resistance; the electric current detecting module, the keyboard, the LCD unit and the storage unit are respectively connected with the testing unit which communicates with a main controller of galvanic pile and other equipments through the communication interface. The invention has compact and legible circuit, high reliability, moderate cost, high measurement precision, quick measurement speed and ample and scalable interfaces, and the invention satisfies the requirements of the real-time and high-precision testing of the essential resistance and the voltage of the single cell of the fuel cell stack.

Description

technical field [0001] The invention belongs to a system for testing the internal resistance and voltage of a series power supply unit, in particular to an on-line testing system for the internal resistance and voltage of a fuel cell stack monolithic battery. Background technique [0002] A fuel cell is a device that converts chemical energy stored in fuel and oxidant into electrical energy through an electrochemical reaction. The biggest feature of this device is that no combustion is involved in the reaction process, so its energy conversion efficiency is not limited by the "Carnot cycle", and the actual efficiency is 2 to 3 times that of ordinary internal combustion engines. In addition, it also has the advantages of high energy, low noise, no pollution, and zero emissions. Therefore, countries all over the world regard it as one of the major research projects to solve the problems of environment and energy shortage. According to the fuel cell power requirements in pract...

AI Technical Summary

Problems solved by technology

These devices test the internal resistance of the fuel cell by controlling the electronic load. Since the load carried by the actual fuel cell stack cannot be controlled according to the test requirements, their method cannot be used for online testing.

[0004] Most of the above-mentioned testers also have the function of testing the voltage of a fuel cell single cell, but the single cell impedance test and the single cell voltage test are carried out separately, which also limits its function.

Images