Proton exchange membrane fuel cell bipolar plate based on symmetrical serpentine structure flow field

Abstract

The invention discloses a proton exchange membrane fuel cell bipolar plate based on a symmetrical serpentine structure flow field. The bipolar plate comprises a gas flow field (1) and is characterizedin that the gas flow field (1) is symmetrically distributed in a serpentine shape; a reaction gas inlet (2) and a generated product outlet (10) of the gas flow field (1) are respectively positioned at two ends of one diagonal line of the gas flow field (1) and are diagonally distributed, and a ridge (3) positioned in a connecting line of the reaction gas inlet (2) and the generated product outlet(10) divides a flow channel starting from the reaction gas inlet (2) into two parts of snake-shaped flow channels which are symmetrically arranged. Compared with a traditional snakelike flow field, the symmetrical snakelike structure flow field overcomes the defect that the pressure drop of the snakelike flow field is large, enhances the gas transmission performance, enables the gas distributionto be more uniform, improves the generated water discharge performance of the fuel cell, enables the overall current density distribution to be more uniform, and thus improves the overall performanceof the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cell bipolar plates, in particular to a proton exchange membrane fuel cell bipolar plate based on a symmetrical serpentine structure flow field. Background technique [0002] The proton exchange membrane fuel cell has the advantages of environmental protection, high energy conversion efficiency and low operating temperature, and has a very good application prospect. It is considered to be the most ideal energy conversion device. As an integral part of the fuel cell, the bipolar plate is The role in battery performance is critical. [0003] There are flow fields of various shapes on the bipolar plate. The reaction gas diffuses to the gas catalytic layer through the flow field, and then produces a chemical reaction in the catalytic layer. At the same time, the reaction product liquid water is discharged from the fuel cell through the flow field. The uneven distribution of gas ...

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Problems solved by technology

The parallel flow field has multiple flow channels between the inlet and the outlet. The advantage is that the pressure difference between the flow channels is small, but the disadvantage is that when one flow channel is blocked, the gas will disperse to other flow channels, resulting in gas distribution. Unevenness; the advantage of the serpentine flow field is that its large pressure drop is easy to drain, but the gas is unevenly distributed in the middle and rear of the flow channel, which in turn affects the performance of the fuel cell; the interdigitated flow field promotes gas convection, but the pressure difference Too large, not suitable for high-power stacks

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