Distributed measurement and control device for the internal temperature of fuel cell and electric pile thereof

Abstract

The invention provides a distributed measurement and control device for the internal temperature of a fuel cell. The distributed measurement and control device comprises a double-sided temperature measurement and control plate and an upper computer. The double-sided temperature measurement and control board is arranged between any two adjacent fuel cell units and consists of a plurality of measurement and control units arranged in an array, and each measurement and control unit comprises a top copper-clad gold-plated partition, a top wiring layer, a top power supply layer, an on-off control layer, a buried resistance layer, a bottom power supply layer, a bottom wiring layer and a bottom copper-clad gold-plated partition; the top layer copper-clad gold-plated partition and the bottom layer copper-clad gold-plated partition are correspondingly provided with metalized via holes and temperature acquisition unit grooves internally provided with temperature sensitive elements, and detection signals are transmitted to the signal processing module through the corresponding top layer wiring layer or the bottom layer wiring layer for signal processing; a heating branch composed of a PMOS tube and a thermal resistor is arranged between the top power supply layer and the bottom power supply layer, the grid electrode controls the PMOS tube to be switched on or switched off according to a voltage control signal of the signal processing module, and temperature compensation of the thermal resistor is achieved.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a distributed measurement and control device for internal temperature of a fuel cell and an electric stack thereof. Background technique [0002] Because of its high efficiency, low pollution, no noise and other characteristics, fuel cells are generally valued by countries all over the world. Among them, proton exchange membrane fuel cells (Proton exchange membrane fuel cells, PEMFC) also have the advantages of rapid start-up at room temperature, no electrolyte loss, easy drainage, long life, high power ratio and energy ratio, and have been gradually applied in aerospace ships. , automotive, backup power lights field. [0003] Among the parameters affecting the performance of PEMFC, the influence of temperature is very significant. According to the Nernst equation, under the same gas pressure, the voltage of the fuel cell increases linearly with the cell temperature. In f...

AI Technical Summary

Problems solved by technology

[0005] In addition, if the temperature difference in a single cell is too large, it will cause the membrane to be heated unevenly, thereby reducing the life of the battery; if the temperature difference between the cells in the stack is too large, it is difficult to control the working temperature of the stack at this time. It will cause the uniformity of each single cell to decrease and reduce the output performance of the stack

At the same time, this uneven distribution of temperature will affect the activity of the enzyme on the membrane electrode, which is reflected in the uneven distribution of the strength of the reaction; the difference in the degree of reaction in different areas of the stack will further aggravate the uneven temperature

In order to avoid the uniformity of stack performance caused by this positive feedback relationship, and to minimize the influence of temperature factors on different areas of the battery during the research process, it is necessary to design an online partition detection device that can actively control temperature

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