HYBRID ELECTRICAL POWER SYSTEM FOR INDUSTRIAL ELECTRIC VEHICLE AND METHOD OF OPERATION THEREOF

摘要

A hybrid electrical power system for an electric vehicle, particularly an industrial electric vehicle such as an electric forklift, comprises a fuel cell stack, a DC/DC converter and a Li-ion battery. The DC/DC converter comprises a transformer for converting a voltage of direct current generated by the fuel cell stack to another voltage, and a controller for generating a reference voltage for the another voltage to approach. When the reference voltage is set to be larger than the another voltage, the fuel cell stack provides power to drive the vehicle and charge the Li-ion battery. When the reference voltage is set to be not larger than the voltage of direct current from the Li-ion battery, both the Li-ion battery and the fuel cell stack provide power to drive the vehicle.

主权项

1. A hybrid electrical power system for a vehicle comprising:
a fuel cell stack which generates electricity by a chemical reaction between a fuel and oxygen; a direct current/direct current (DC/DC) converter in electrical connection with the fuel cell stack for converting a voltage of direct current generated by the fuel cell stack into another voltage of direct current, the DC/DC converter comprising a transformer for performing the voltage conversion and a controller for setting a reference voltage to the transformer for the another voltage to approach, the DC/DC converter having an output configured for electrical connection with an electric motor of the vehicle; and a rechargeable battery in electrical coupling with the output of the DC/DC converter and configured for electrical connection with the electric motor of the vehicle.