Fuel cell cooling system and temperature control method thereof

Abstract

The invention relates to a fuel cell cooling system and a temperature control method thereof. The fuel cell cooling system comprises a cooling fan, a control module, a current collecting module and atemperature collecting module. The temperature control method comprises the following steps: the control module receives the current signal, obtains the target temperature according to the relationship between the current and the temperature of the fuel cell, receives the temperature signal to obtain the positive and negative sign X of the temperature change slope L and the slope absolute value Y,adjusts the speed of the cooling fan according to the positive and negative sign X and the slope absolute value Y, and returns to the above steps after the cooling fan adjusts the speed until the current temperature is equal to the target temperature. The fuel cell cooling system described above has a simple structure, and the control module adjusts the rotational speed of the cooling fan according to the data of the current collecting module and the temperature collecting module, with fast response speed, high control precision and high stability, thereby greatly improving the work efficiency of the fuel cell, and extending the working life of the fuel cell.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell cooling system and a temperature control method thereof. Background technique [0002] A fuel cell is a power generating device that directly converts chemical energy into electrical energy. The proton exchange membrane fuel cell is one of the fuel cells. The principle is the reverse reaction of electrolyzing water. It consists of an anode, a proton exchange membrane and a cathode. The proton exchange membrane acts as an electrolyte and conducts protons through hydronium ions. The proton transfer rate of the proton exchange membrane directly affects the performance of the battery, and the transfer rate is directly affected by the operating temperature, so the operating temperature of the fuel cell is one of the important factors affecting the performance of the fuel cell. [0003] Under different temperature conditions, the working efficiency of the fuel cell is very differ...

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Problems solved by technology

[0003] Under different temperature conditions, the working efficiency of the fuel cell is very different. For example, if the working temperature of the fuel cell is too low, it will easily lead to the dehydration of the proton exchange membrane and the reduction of the number of hydronium ions, which will slow down the transmission rate of protons and reduce the performance of the battery. , and affect the life of the battery; the operating temperature of the fuel cell is too low, it is easy to form liquid water on the anode side, which is not conducive to the diffusion of hydrogen gas on the anode side, resulting in unstable battery voltage, and can also cause battery voltage reversal, which seriously damages the battery. The temperature of the fuel cell is precisely controlled

[0004] In the traditional technology, the cooling system of the fuel cell includes a temperature sensor, a PID (proportion integral derivative) temperature control system and a cooling fan. The temperature sensor detects, and then the speed of the cooling fan is adjusted by the PID temperature control system. The PID temperature control system has Susceptible to external interference, difficult to set parameters, long adjustment time and other shortcomings, resulting in poor reliability of the cooling system of the fuel cell, low heat dissipation efficiency, low working efficiency of the fuel cell, and short service life of the fuel cell

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