Low-temperature quick starting system and method for fuel cell stack

Abstract

The invention provides a low-temperature quick starting system and method for a fuel cell stack, and the system comprises a special low-temperature starting small circulation system which is composedof a low-temperature starting water tank, a low-temperature starting water pump, four valves and a heat exchange device, wherein the heat exchange device is connected between an outlet and an inlet ofa fuel cell stack cooling cavity in series. The starting method comprises the following steps: opening a valve I and a valve III, closing a valve II and a valve IV, starting a fuel cell, and activating and purging an electric pile; after completion, closing the valve I and the valve III, opening the valve II and the valve IV, starting the low-temperature starting water pump, starting the low-temperature starting special small circulation system, and entering low-temperature starting; after success, opening the valve I and the valve III, closing the valve II and the valve IV, stopping the low-temperature starting water pump, and performing the normal operation of the electric pile. The invention has the beneficial effects that the starting method is simple, practical and effective, the low-temperature starting time is shortened, the power output of low-temperature starting is improved, no external heating unit or extra energy consumption exists, and no damage is caused to the electricpile.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to low-temperature quick-start technology of fuel cell stacks. Background technique [0002] Low-temperature start-up of fuel cells has always been one of the key factors restricting the commercialization of fuel cell vehicles. When the fuel cell stack starts quickly below zero, the water generated by the internal reaction of the battery is easy to freeze in a low-temperature environment, thereby reducing the stack reaction area and blocking the gas channel, resulting in low-temperature start-up failure. Therefore, rapidly raising the internal temperature of the stack to above zero is the key to the low-temperature start-up of the fuel cell. [0003] In order to solve the problem of quick start at low temperature, there are multiple methods in the prior art, and what is closest to the present invention is: [0004] A low-temperature start-up system equipped with a special small...

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Problems solved by technology

[0016] The patent "a thermal management system and method for low-temperature start-up of a fuel cell power generation system" requires an external power supply to provide electric energy, and the supporting equipment is complex and consumes a lot of energy

[0017] The patent "a fast start-up proton exchange membrane fuel cell below 0°C" requires external power supply equipment, which increases the complexity of the system

[0018] The patent "a method for starting a proton exchange membrane fuel cell at sub-zero temperature" will cause a certain degree of corrosion to the electrode and affect its service life

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