Active-draining fuel battery bipolar plate with veined interdigitated flow field

Abstract

The invention relates to an active-draining fuel battery bipolar plate with a veined interdigitated flow field. The active-draining fuel battery bipolar plate comprises a bipolar plate body provided with the interdigitated flow field which is circular or equilateral polygonal; with the central point of the flow field as the center of a circle, the interdigitated flow field a local flow field whichis divided into n parts averagely, wherein n is not less than 2; the local flow field comprises a reaction gas inlet, a reaction gas outlet, a veined gas inlet channel, and a serpentine gas outlet and water drain channel, wherein the reaction gas inlet is arranged at the outer end of the veined gas inlet channel, and the reaction gas outlet is arranged at the outer end of the serpentine gas outlet and water drain channel. According to the technical scheme, mass transfer of the whole battery is more uniform; the design of the active-draining channel can promote draining of water in the gas outlet channel, water generated in the reaction can be diffused to the gas outlet channel more easily, and further water retention at the gas inlet is reduced.

Description

technical field [0001] The invention relates to a bipolar plate of a proton exchange membrane fuel cell, in particular to a bipolar plate of an active drainage vein-shaped interdigitated flow field fuel cell. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) has considerable market application prospects because of its high energy conversion rate, no pollution, fast start-up and other advantages. Compared with a heat engine, the chemical energy of a fuel cell is directly converted into electrical energy without the need for an initial conversion into heat. Therefore, the conversion is not limited by the Carnot cycle, and theoretically a high efficiency of 90% conversion can be achieved. [0003] The core of a fuel cell is a membrane electrode and a bipolar plate. Membrane electrodes are places for electrochemical reactions; bipolar plates provide gas distribution and current collection. In order to complete the two tasks of gas distribution and curren...

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Problems solved by technology

[0009] In the current existing technology, due to the large pressure drop of the traditional interdigitated flow field, when the battery output is working, the inhomogeneity of the distribution of reactants in the effective area makes the electrochemical reaction in the area insufficient, resulting in the reaction between the reactants and the motor. The utilization rate is reduced, which will affect the stability of the current output. At the same time, in the interdigitated flow field, the end of the flow channel is blocked, and the gas is forced to enter the adjacent flow channel through the diffusion layer under the current collection spine. The main disadvantage of this kind of flow field is that due to the accumulation of water generated by the battery at the outlet of the battery, more liquid water will easily cause the battery to flood and affect the performance of the battery.

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