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Fuel cell stack starting method

A technology of fuel cell stacks and stacks, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of not disclosing the specific operating conditions of the stack start-up, slow start-up speed of the fuel cell stack, etc., and reduce the voltage of the stack , increase the current, the effect of fast start-up speed

Active Publication Date: 2021-06-11
SHANGHAI SHENLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

resulting in slower start-up of the fuel cell stack
[0003] The methods in the prior art are mainly for the start-up of fuel cells below 0°C, and do not disclose the specific operating conditions for start-up applicable to the stack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for starting a fuel cell stack, the method is as follows: according to a loading speed of 15A / s, load to a warm-up current of 145A, during the loading process, the metering ratio of hydrogen is the flow rate of St.a=1.2, and the metering ratio of air is St. .c=1.5, after the current rises to 145A, reduce the air metering ratio to 1.01. The voltage, current and cooling water inlet and outlet temperature curves during the loading process are as follows: Figure 2-3 shown. It takes about 112s for the stack to heat up from room temperature to 50°C.

Embodiment 2

[0055] A method for starting a fuel cell stack, the method is as follows: according to a loading speed of 15A / s, load to a warm-up current of 290A, during the loading process, the metering ratio of hydrogen is the flow rate of St.a=1.2, and the metering ratio of air is St. .c=1.5, after the current rises to 290A, reduce the air metering ratio to 1.05. The voltage, current and cooling water inlet and outlet temperature curves during the loading process are as follows: Figure 4-5 shown. It takes about 52s for the stack to heat from room temperature to 50°C.

Embodiment 3

[0057] A method for starting a fuel cell stack, the method is as follows: according to a loading speed of 15A / s, load to a warm-up current of 290A, during the loading process, the metering ratio of hydrogen is the flow rate of St.a=1.2, and the metering ratio of air is St. .c=1.5, after the current rises to 290A, keep the flow of hydrogen and air constant, the current rises rapidly to 340A, and the time for the stack to heat from room temperature to 50°C is about 53s.

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Abstract

The invention relates to a fuel cell stack starting method which comprises the following steps of (1) introducing hydrogen and air of a certain stoichiometric ratio into a fuel cell stack, and carrying out electrochemical reaction; (2) loading to a warm-up current at a certain current loading speed; and (3) when the current of the electric pile reaches the warm-up current, reducing the air stoichiometric ratio or continuously improving the current intensity, so that the starting speed of the electric pile is higher. Compared with the prior art, the method is suitable for starting at the temperature above zero, and compared with a conventional starting method, the warm-up time is shorter.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for starting a fuel cell stack. Background technique [0002] When the fuel cell is started from normal temperature, in order to avoid excessive water production under high current, which will cause the stack to flood and other start-up failures, it is generally necessary to control the speed of current loading during start-up, or maintain a period of time at a relatively low current. Time to warm up the stack before further loading to the target high current. As a result, the start-up speed of the fuel cell stack is relatively slow. [0003] The methods in the prior art are mainly for the start-up of the fuel cell below 0°C, and do not disclose the specific operating conditions for the start-up of the electric stack. In addition, the problems and risks faced by starting at sub-zero temperature are different from the problems and risks of starting at above-zero temperature (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04302H01M8/04225H01M8/04537
CPCH01M8/04302H01M8/04225H01M8/04268H01M8/04574Y02E60/50
Inventor 汤千秋甘全全戴威
Owner SHANGHAI SHENLI TECH CO LTD