Proton exchange membrane fuel cell stack activation method

Abstract

The invention discloses an activation method of a proton exchange membrane fuel cell stack. The activation method comprises the following steps: step 1, checking the air tightness of the proton exchange membrane fuel cell stack; step 2, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack, introducing air into the cathode of the proton exchange membrane fuel cell stack, gradually reducing the voltage of the proton exchange membrane fuel cell stack in a constant-voltage mode, and keeping the voltage for 5-10 minutes; 3, cooling the proton exchange membrane fuel cell stack; step 4, repeating the step 2 and the step 3 for 3-5 times, and then stopping air intake of the anode; and 5, introducing hot water into the anode of the proton exchange membrane fuel cell stack until the performance of the proton exchange membrane fuel cell stack is stable. According to the activation method of the proton exchange membrane fuel cell stack provided by the invention, the activation cost is remarkably reduced, and the whole activation process can be completed within about 1 hour.

Description

technical field [0001] The invention relates to the technical field of fuel cells, [0002] In particular, the present invention relates to a method for activating a proton exchange membrane fuel cell stack. Background technique [0003] A proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts the chemical energy stored in fuel into electrical energy without combustion. PEMFC is mainly composed of a bipolar plate, a porous mass transfer layer and a membrane electrode. The membrane electrode is composed of a proton exchange membrane and an electrode coated with a catalyst on both sides. The outside of the electrode is a gas diffusion layer. A single cell is formed by clamping the membrane electrode with a graphite plate or metal plate with a flow channel. A sealing ring is provided between the graphite plate and the gas diffusion layer to ensure the airtightness of the battery. The fuel cell stack is assembled by stacking multiple sin...

AI Technical Summary

Problems solved by technology

At present, the commonly used fuel cell activation methods include electrolytic activation method and constant current natural activation method. The electrolytic activation method is likely to cause problems such as uneven voltage distribution, non-parallel activation effects, and reduced membrane electrode activity; the constant current natural activation method needs to consume a large amount of hydrogen and Additional humidification device, which increases the cost and requires a longer activation time, usually more than 4 hours

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