Fuel cell system capable of relieving cell water logging

Abstract

The invention discloses a fuel cell system capable of relieving cell water logging. The system comprises an electric pile for producing electricity by using an electrochemical ration between oxygen-containing gas and hydrogen-containing gas, an air supply device for supplying the humidified oxygen-containing gas for the electric pile, a hydrogen supply device for supplying the hydrogen-containing gas for the electric pile and a cooling device for carrying out heat exchange between heat generated in the power generation process and guided cooling water on the electric pile, wherein the cooling device comprises a cooling water tank, a cooling water pump and a cooling flow passage arranged in the electric pile. The system also comprises a condensing device, for condensing air tail gas, which is arranged at an air outlet of the electric pile; a gas outlet of the condensing device is communicated with the outside; and a liquid water outlet of the condensing device is connected with the cooling water tank. According to the fuel cell system, the cell water logging can be relieved effectively, and the power of the electric pile is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell system for alleviating battery flooding. Background technique [0002] Proton exchange membrane fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. Advantages, more and more widespread attention, known as an excellent power source. Water and gas management is one of the key issues that fuel cells urgently need to solve. During the operation of the fuel cell, the water inside the cell should be strictly maintained to balance, so as to solve the contradiction between the membrane's hydration requirement and the prevention of the battery's cathode from being flooded. Currently, the reaction gas is usually humidified to maintain a high water content in the electrode to ensure reasonable proton conductivity. However, during operation, the cathode continuously generates water. When the partial pressure of...

AI Technical Summary

Problems solved by technology

However, during operation, the cathode continuously generates water. When the partial pressure of water vapor reaches its saturated vapor pressure, liquid water will be precipitated, especially at high power. cause "flooding"

The gas transmission channel in the "flooded" area is blocked, which reduces the effective power generation area of ​​the battery, causing a sharp drop in performance, and in severe cases, it will cause the battery to reverse polarity and cause irreversible damage to the battery

[0003] The hydrogen tail gas of traditional fuel cell systems is usually directly discharged into the atmosphere, which will bring many adverse effects, and also reduce the utilization rate of hydrogen, which is generally about 65%-95%.

Relevant researchers burn unreacted hydrogen directly through tail gas catalytic fuel, avoiding the harm caused by hydrogen being directly discharged into the atmosphere, but this cannot solve the problem of hydrogen utilization

In addition, additional exhaust processors are required, often requiring precious metals as catalysts, which increase the volume, weight and cost of the system

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