A method for balancing the water in the proton exchange film fuel battery via the dual-electrode plate

Abstract

The invention relates to keep water balance for proton exchange film fuel cell. Wherein, selecting a bipolar plate contained hydrophilic gel pore; when the cell runs, filling H2 and O2 through two surfaces of the plate, and the cooling water on middle of the plate; in virtue of the cooling water in pipe, adjusting the pressure of reacting gas and water to humidify the fuel cell and discharge the yield water. This invention adjusts the humidification level according to cell output power and has well effect to H2 and O2, is simple both on operation and assembly, and runs stably and durably.

Description

technical field [0001] The invention relates to a method for maintaining water balance in a proton exchange membrane fuel cell. Background technique [0002] Water management is an important issue affecting the practicality of proton exchange membrane fuel cell (PEMFC) technology. During the operation of PEMFC, maintaining the balance of water in PEMFC plays an important role in improving the power of PEMFC, optimizing fuel efficiency, life and safety of PEMFC. plays a key role. The water management of PEMFC mainly includes two aspects: one is to humidify the proton exchange membrane (to prevent the dehydration of the proton exchange membrane and lose the proton conductivity), and the other is to remove the product water of the cathode (to prevent the electrode from being flooded and blocking the gas channel). ), to maintain the water balance in PEMFC. [0003] Proton exchange membrane is one of the core components of PEMFC. Perfluorosulfonic acid membrane is currently the...

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Problems solved by technology

[0011] Trung V (J. Electrochem. Soc., 1996, 143: L103) and Finland's Energy Partners (US6207312B1, WO00 / 17952) combined the interdigitated flow field with the closed flow channel to improve the gas utilization rate , strengthen the convective mass transfer and diffusion mass transfer of the reaction gas in the diffusion layer, so that the water generated by the reaction is driven by the gas flow on both sides of the membrane, and the forced convective reaction gas transfers water in the membrane along the direction of the vertical flow field, so that the battery self- The purpose of humidification, the disadvantage is that a large gas pressure drop is required

However, it is not immune to the problems of machining graphite plates, and the pore size and pore size distribution are difficult to control precisely, and the operability is not strong

[0021] The above-mentioned methods for water balance in PEMFC have certain defects, and cannot complete the humidification of PEMFC and the discharge of product water at the same time

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