Vehicle fuel cell system and method for low temperature starting through alloy hydrogen storage material

Abstract

The invention provides a vehicle fuel cell system and method for low temperature starting through an alloy hydrogen storage material. The vehicle fuel cell system comprises a fuel cell stack, an air path subsystem, a hydrogen path subsystem, a cooling liquid path subsystem and a control circuit subsystem, the hydrogen path subsystem comprises an alloy hydrogen storage tank branch path and a high pressure gas bottle branch path, and an alloy hydrogen storage tank is arranged in a water box of the cooling liquid path subsystem. The method for low temperature starting comprises the steps of making a high pressure gas bottle inflate an alloy hydrogen storage tank with hydrogen, when the hydrogen storage material is inflated with hydrogen, conducting heat release, heating cooling liquid in thewater box, when the cooling liquid reaches set temperature, starting a circulation water pump, heating a fuel cell electric stack, when the electric stack reaches set operable temperature, stopping hydrogen inflation and starting the fuel cell system. The vehicle fuel cell system and method have the advantages that fuel is not consumed, and external heating equipment is not added, so that high pressure gas bottle hydrogen storage and hydrogen storage material hydrogen storage supplement each other; when low temperature starting is not needed, the driving mileage of a fuel cell vehicle can alsobe increased.

Description

technical field [0001] The invention belongs to the field of fuel cells, and particularly relates to low-temperature startup of a vehicle fuel cell system. Background technique [0002] Vehicle fuel cell systems will be in a working environment below 0 °C in winter, and even reach a low temperature of -35 °C. In such a low temperature environment, the catalyst activity in the fuel cell is very low, and the water in it will freeze, making it difficult to start the fuel cell system to output electrical energy. [0003] In order to solve the problem of low-temperature start-up of fuel cell systems, in the prior art, there are two types of strategies for low-temperature start-up of fuel cells: one is to use an internal heat source to heat the fuel cell. A startup system that operates at a low current density. For example, when the fuel cell is below a certain temperature (about zero degrees), the startup system that operates at a low current density is turned on to heat the fue...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a method to solve the problem of starting a fuel cell for a vehicle at a low temperature by utilizing the heat release characteristics of an alloy hydrogen storage material during hydrogen charging

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