Fuel cell stack anode water management control system and control method

Abstract

The invention relates to a fuel cell stack anode water management control system and control method, and the fuel cell stack comprises a first hydrogen circulation port and a second hydrogen circulation port which are arranged at an anode, and an air inlet and an air outlet which are arranged at a cathode, the control system comprises a first electromagnetic valve arranged at the first hydrogen circulation opening, a second electromagnetic valve and a third electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are arranged at the second hydrogen circulation opening and are connected in parallel, the second electromagnetic valve is connected with a hydrogen source, and the first electromagnetic valve and the third electromagnetic valve are opened or closed at the same time; and at most only one of the second electromagnetic valve and the third electromagnetic valve is opened. Water distribution in the fuel cell anode flow channel tends to be balanced, so that the reliability of the fuel cell is improved, and the service life of the fuel cell is prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell stack anode water management control system and control method. Background technique [0002] The fuel cell stack is a power generation device that directly converts the chemical energy of fuel into electrical energy. It has the advantages of high power density, no pollution, and low noise, and has broad application prospects. Fuel cells can be divided into proton exchange membrane fuel cells, direct methanol fuel cells, alkaline fuel cells, solid oxide fuel cells, molten salt fuel cells, microbial fuel cells, etc. [0003] When the fuel cell stack is working, an electrochemical reaction takes place inside it. Take the proton exchange membrane fuel cell (PEMFC) as an example. With hydrogen as fuel, the electrode reaction of PEMFC is as follows: [0004] Anode: H 2 →2H + +2e - [0005] Cathode: 0.5O 2 +2H + +2e - →H 2 o [0006] It can be seen from the e...

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Problems solved by technology

However, the method of using a hydrogen circulation pump has the disadvantages of large volume and weight, high power consumption, and high cost. The use of an ejector will limit the stack to work normally under fixed working conditions, and both methods can only circulate in one direction , does not fundamentally solve the problem of uneven water distribution inside the fuel cell stack, which has a great impact on stability and reliability

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