Bipolar plate assembly and fuel cell

Abstract

The invention relates to the technical field of fuel cells, and discloses a bipolar plate assembly and a fuel cell. The bipolar plate assembly comprises a polar plate body, a wedge-shaped structure and a water guide assembly, wherein a gas flow channel is formed in the polar plate body; the wedge-shaped structure is arranged in the gas flow channel, a first inclined face is arranged on the side, which is away from the bottom of the gas flow channel, of the wedge-shaped structure, the first inclined face inclines upwards in the direction from an inlet of the gas flow channel to an outlet of thegas flow channel, and the water guide assembly is arranged on the wedge-shaped structure and used for guiding out water generated by gas fuel reaction. According to the bipolar plate assembly provided by the invention, the longitudinal sectional area of the side, which is close to the outlet of the gas flow channel, of the gas flow channel is smaller than that of the side, which is close to the inlet of the gas flow channel, of the gas flow channel, the gas flowing speed is increased, and uniform distribution of gas concentration in the whole flow field is guaranteed; and by arranging the water guide assembly, water produced by gas fuel reaction can be discharged in time, and gas transmission is prevented from being affected.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a bipolar plate assembly and a fuel cell. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy of a substance into electrical energy. It has high conversion efficiency and is clean and environmentally friendly. As a power supply device, it can continuously output electrical energy as long as there is fuel. As the core component of the fuel cell, the bipolar plate is mainly used to realize the transmission and distribution of reactant substances, support the membrane electrode assembly, collect current, and export the water and heat generated by the fuel reaction to the fuel cell stack. Therefore, the structure of the bipolar plate plays a vital role in the performance of the fuel cell. [0003] The existing bipolar plate is usually provided with a straight channel or a serpentine flow channel. The cross section of...

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Problems solved by technology

[0003] The existing bipolar plate is usually provided with a straight channel or a serpentine flow channel. The cross section of this type of flow channel is a rectangular structure. With this structure, the concentration of the gas at the entrance of the flow channel is relatively high. With the continuous reaction of the gas, Along the flow direction of the gas, the gas concentration in the flow channel decreases continuously, and the distribution of the gas in the entire flow field is extremely uneven. At the same time, the water generated by the gas fuel reaction is not easy to discharge the stack, and it is easy to accumulate in the flow channel, blocking the flow channel, causing Gas transport is blocked, which has a greater impact on the performance of the fuel cell

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