Manifold device for fuel cell stack

Abstract

The invention provides a manifold device for a fuel cell stack. The manifold device comprises an intake manifold and an exhaust manifold which are symmetrically arranged up and down, the inlet of theintake manifold and the outlet of the exhaust manifold are respectively positioned at the left and right sides of the fuel cell stack, and a plurality of air inlets are uniformly formed at the bottomof the air inlet manifold at intervals and correspond to the gas inlets of the unit cells in the fuel cell stack respectively. A plurality of exhaust ports are uniformly formed at the top of the exhaust manifold at intervals and correspond to the exhaust ports of the unit cells in the fuel cell stack respectively, and a gas homogenizing device is arranged in the gas inlet manifold and is used foradjusting the gas inlet uniformity of the unit cells, so that the uniformity of flow distribution of reaction gas entering the unit cells can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cell stacks, in particular to a manifold device for fuel cell stacks. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy in fuel into electrical energy. It can be used as a The main power source of various transportation vehicles. In order to meet the power requirements, a certain number of unit cells are usually assembled in series to form a stack to ensure sufficient output power. [0003] The fuel cell inlet and outlet gas manifolds are respectively responsible for distributing the externally supplied fluid to each unit cell for reaction, and collecting and discharging the remaining gas from the stack. The fuel cell manifold is affected by factors such as flow resistance and throttling. It is difficult to ensure uniform intake pressure and intake volume of each battery unit in the stack. The resulting problem is that there are difference...

AI Technical Summary

Problems solved by technology

The fuel cell manifold is affected by factors such as flow resistance and throttling. It is difficult to ensure uniform intake pressure and intake volume of each battery unit in the stack. The resulting problem is that there are differences in performance between battery units, and further The performance of the battery unit with insufficient gas volume is low, and the battery unit with too much gas volume causes waste of gas due to excess gas, resulting in a decrease in the output power of the stack

[0004] At present, in the existing fuel cell stack manifold, the flow uniformity of the reactant gas flowing through each unit cell in the stack is not ideal, and the gas flow rate of the battery cells at both ends is quite different.

Using a tapered manifold, although the uniformity of the gas is slightly improved, the effect is not enough to meet the purpose of greatly improving the uniformity of gas distribution. In addition, there are differences in the size of the bipolar plates, which is not convenient for mass production

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