A fuel cell bipolar plate and stack

Abstract

The present invention provides a fuel cell bipolar plate and stack, comprising: an anode reactant inlet and a cathode reactant outlet located on the first side of the bipolar plate, an anode reactant outlet located on the second side of the bipolar plate and The cathode reactant inlet, the coolant inlet on the third side of the bipolar plate, the coolant outlet on the fourth or third side of the bipolar plate; the anode reactant channel and the cathode reactant channel on the first side to the second Extending in the direction of the two sides, the cooling liquid channel includes a plurality of interconnected cooling liquid sub-channels, the cooling liquid sub-channel extends from the third side to the fourth side, wherein, in the two adjacent cooling liquid sub-channels The flow direction of the cooling liquid is opposite, which can not only increase the area of ​​the reactant inlet and outlet, prevent the cooling liquid and the reactant from crossing each other, but also help to adjust the length-width ratio of the bipolar plate, improve the mechanical strength of the bipolar plate, and realize the The temperature gradient in the flow direction of the reactants realizes the hydrothermal balance in the fuel cell.

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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