Onboard fuel cell water management system and method

Abstract

The invention belongs to the field of fuel cells and discloses an onboard fuel cell water management system and method. The system comprises a hydrogen supply component, a first gas-water separator, avoltaic pile, a first drain valve, a second gas-water separator, a second drain valve, an exhaust valve and a circulation pump, wherein the inlet of the first gas-water separator is connected to theoutlet of the hydrogen supply component; the gas outlet of the first gas-water separator is connected to the hydrogen inlet of the voltaic pile; the water outlet of the first gas-water separator is connected to the first drain valve; the inlet of the second gas-water separator is connected to the hydrogen outlet of the voltaic pile; the first gas outlet of the second gas-water separator is connected with the exhaust valve and the first drain valve; the second gas outlet of the second gas-water separator is connected to the inlet of the first gas-water separator through the circulation pump; and the water outlet of the second gas-water separator is connected to the second drain valve. The system configures different drainage and exhaust circuits under different working conditions to preventthe anode of the voltaic pile from being insufficiently humidified or excessively humidified, thereby improving the performance of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a vehicle-mounted fuel cell water management system and method. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is an electrochemical power generation device that uses hydrogen as fuel and oxygen as oxidant. The only reaction product in the fuel cell, water, is formed at the cathode by the combination of hydrogen and oxygen under the action of a catalyst. [0003] In a fuel cell, the presence of liquid water will cause the gas to be unevenly distributed within the electrodes and among the units in the system, which will lead to a decrease in the performance of the fuel cell and cause inconsistent voltages among the individual cells in the system. Too much or too little liquid water will have a negative impact on the proton exchange membrane fuel cell. [0004] At present, in the existing technology, a single gas-water separator and a circ...

AI Technical Summary

Problems solved by technology

This method will make the hydrogen circulated back to the stack from the circulation device almost in a saturated state and still entrain a small amount of liquid water droplets. When mixed with the low-temperature dry hydrogen at the outlet of the pressure regulating valve, the high-temperature and high-humidity return hydrogen will precipitate liquid water, and the liquid water will enter Flooding caused by the anode of the stack will affect the performance of the fuel cell

Images