Power system of fuel cell car with ultra-low-temperature cold starting function

Abstract

The invention discloses a power system of a fuel cell car with an ultra-low-temperature cold starting function. The power system comprises a proton exchange membrane fuel cell and a lithium cell, thefeeding end of the proton exchange membrane fuel cell is connected with a power generation hydrogen input pipe and a power generation air input pipe, the power generation hydrogen input pipe is communicated with a hydrogen cylinder, the power generation air input pipe is communicated with an air compressor, a coolant circulation pipe is arranged between the feeding end and the discharging end ofthe proton exchange membrane fuel cell, an air and exhaust gas pipe, a hydrogen circulation pipe, a condensate water outer discharging pipe and a heating exhaust gas pipe are connected at the discharging end of the proton exchange membrane fuel cell, a plurality of heating units are arranged in the proton exchange membrane fuel cell, each heating unit is arranged between one pair of adjacent mono-cells, an exhaust gas heat insulation pipe is arranged outside the lithium cell, and the heating exhaust gas pipe is communicated with the input end of the exhaust gas heat insulation pipe. The powersystem has the advantages that the system can be started at the ultra-low temperature, hydrogen consuming amount of the system is low when cold starting of the system is implemented, the cold starting time is short, and the system is good in running stability.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cell vehicles, in particular to the power system of proton exchange membrane fuel cell vehicles. Background technique [0002] Since the proton exchange membrane fuel cell is an electrochemical power generation device that uses hydrogen and oxygen as raw materials to electrochemically react to generate water and convert chemical energy into electrical energy at the same time, it has the characteristics of cleanness, high efficiency, energy saving and environmental protection, and high energy conversion rate. Therefore, it is more and more widely used in automobiles. [0003] The power system of a proton exchange membrane fuel cell vehicle includes: a proton exchange membrane fuel cell and a lithium battery. There are power generation hydrogen input pipes with power generation hydrogen solenoid valves and power generation air input pipes with power generation air solenoid val...

AI Technical Summary

Problems solved by technology

[0004] The power system in the current proton exchange membrane fuel cell vehicle has the following defects: 1. The water produced by the chemical reaction will remain in the proton exchange membrane fuel cell. In the low temperature environment below freezing point, the liquid in the proton exchange membrane fuel cell Water will freeze, and the reaction heat generated when the proton exchange membrane fuel cell is started is not enough to dissolve the ice, which will affect the start of the entire battery system. In harsh low-temperature environments, the battery operating system may start slowly, difficultly or failure and other issues

2. When the ambient temperature is lower than the freezing point, the efficiency of the lithium battery is greatly reduced, and the power of the lithium battery will be lower than the energy required to start the proton exchange membrane fuel cell

3. In the low temperature environment below freezing point, the lithium battery will greatly consume the power of the proton exchange membrane fuel cell, which will greatly shorten the mileage of the car

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