Fuel cell bipolar plate and electric stack

Abstract

The invention provides a fuel cell bipolar plate and an electric stack. The fuel cell bipolar plate comprises an anode reactant inlet and a cathode reactant outlet arranged on the first side of the bipolar plate, an anode reactant outlet and a cathode reactant inlet arranged on the second side of the bipolar plate, a coolant inlet arranged on the third side of the bipolar plate and a coolant outlet arranged on the fourth or third side of the bipolar plate. An anode reactant channel and a cathode reactant channel extend in the direction from the first side to the second side. The coolant channel includes a plurality of coolant sub-channels communicating with each other. The coolant sub-channels extend in the direction from the third side to the fourth side, wherein the flow directions of the coolant in the two adjacent coolant sub-channels are opposite. The area of the reactant inlet and outlet can be increased to prevent the coolant and the reactant from channeling each other, the length-width ratio of the bipolar plate can be adjusted to improve the mechanical strength of the bipolar plate, and the temperature gradient in the flow direction of the reactant can be realized and thusthe water-heat balance in the fuel cell can be realized.

Description

technical field [0001] The invention relates to the technical field of fuel cells, more specifically, to a fuel cell bipolar plate and an electric stack. Background technique [0002] A fuel cell is a power generating device that directly converts the chemical energy present in fuel and oxidant into electrical energy. Fuel cells have been widely used in power supplies for automatic vehicles, communication base stations, and portable electric tools due to their advantages such as easy start-up, high energy density, long life, zero emissions, and high energy conversion efficiency. [0003] When the fuel cell is working, the anode reactant (such as hydrogen) is input to the anode electrode side, the cathode reactant (such as oxygen) is input to the cathode electrode side, and the anode reactant and the cathode reactant undergo redox reactions at the interface between the electrode and the electrolyte. Generate current and output electrical energy. However, since the fuel cell...

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Problems solved by technology

[0006] In view of this, the present invention provides a fuel cell bipolar plate and an electric stack to solve the problem that the cooling liquid inlet and outlet occupy the space on the short side of the bipolar plate, which limits the design of the gas inlet and outlet and reduces the cost of the bipolar plate. Mechanical strength and problems causing blowby between the coolant and the anode or cathode reactants

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