Internal water content control system and method of fuel cell

Abstract

The invention provides an internal water content system and method of a fuel cell. The system comprises a water content detection system, wherein the water content detection system is arranged at two ends of an electric stack of the fuel cell and is used for detecting water content in a proton membrane in the electric stack of the fuel cell, the water content detection system comprises a ultrasonic wave generator and a ultrasonic receiver, and a controller is connected to the water content detection system and is used for adjusting air supply quantity of an air inlet and exhaust system of the fuel cell according to the water content, received by the water content detection system, of the proton membrane. The water content detection system is used for detecting the water content in the fuel cell, the water content of the proton membrane can be calculated according to the internal water content, and the air supply quantity of the air inlet and exhaust system is adjusted by the controller according to the water content of the proton membrane. By the system, the problems that the generation power of the fuel cell is reduced and the service lifetime of the proton membrane is reduced due to non-uniform water content of the proton membrane during the application of the fuel cell in the prior art are solved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a system and method for controlling water content inside a fuel cell. Background technique [0002] When the hydrogen fuel cell is working, hydrogen and oxygen in the air will produce water in the electrochemical process, and part of the water will wet the proton membrane. The proton membrane can increase the power generation efficiency in a wet state, so that the stack generates electricity, and part of the water will be with the The flow of hydrogen or air exits the stack. [0003] Therefore, it is necessary to detect and control the water content of the proton membrane in the fuel cell stack. This part of water is the water produced after the electrochemical reaction of the stack. The atomized state is stored in the hydrogen channel and air channel of the stack, and finally discharged through the water channel. The proton membrane in the stack needs water to improve the catalytic a...

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Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a fuel cell internal water content control system and method to solve the problem of fuel cell power generation decline and proton membrane failure caused by the uneven water content of the proton membrane in the prior art when the fuel cell is in use. The problem of reduced service life

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