Uniform-flow bipolar plate for fuel cell

Abstract

The invention discloses a flow-uniform bipolar plate for a fuel cell, the bipolar plate is mounted by fitting a membrane electrode, after the bipolar plate is mounted, a hydrogen flow channel and an air flow channel are respectively formed between two sides of the bipolar plate and the membrane electrode, and a cooling liquid flow channel is arranged in the middle of the bipolar plate; the sectional areas of the cooling liquid flow channel, the hydrogen flow channel and the air flow channel are gradually increased from the hydrogen, air and cooling liquid inlet end of the electric pile to the direction far away from the hydrogen, air and cooling liquid inlet end of the electric pile by the cooling liquid flow channel section in the middle of the bipolar plate and the hydrogen flow channel and the air flow channel formed by the two sides of the bipolar plate and the membrane electrode. By adopting the bipolar plates with different flow channel sectional areas, the flow and pressure of a plurality of bipolar plate flow channels are balanced, the pressure requirement on an inlet is reduced, and the performance and reliability of the fuel cell are improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a flow uniformity bipolar plate for fuel cells. Background technique [0002] At present, with the wide application of electric vehicles, various battery technologies have been widely developed, which has brought about the innovation of battery technology. Fuel cells have been widely used because they can directly convert chemical energy into electrical energy, but they are widely used in a large number of applications. Later, it was found that when the fuel cell uses the same bipolar plate, the flow distribution of the hydrogen, air and coolant inlets of the fuel cell near the bipolar plate is uneven, which makes the fuel cell have a greater demand for the inlet pressure. The demand is large, and when the inlet pressure is insufficient, the flow of the coolant is likely to be uneven or the flow rate is slow, which cannot meet the cooling demand, thereby affecting ...

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Problems solved by technology

[0002] At present, with the wide application of electric vehicles, various battery technologies have been widely developed, which brings about the innovation of battery technology. Fuel cells have been widely used because they can directly convert chemical energy into electrical energy. It was later found that when the fuel cell uses bipolar plates of the same specification, the flow distribution of the near-end bipolar plate of the fuel cell hydrogen, air and coolant inlet is uneven, which makes the fuel cell have a greater demand for inlet pressure, and due to the pressure on the inlet pressure of the fuel cell The demand is large. When the inlet pressure is insufficient, it is easy to make the flow of the coolant uneven or slow, which cannot meet the cooling demand, and then affect the performance and service life of the fuel cell.

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