Fuel cell flow guiding bipolar plate capable of draining in time and conveniently, and fuel cell system

Abstract

The invention belongs to the technical field of a fuel cell, and relates to a fuel cell flow guiding bipolar plate capable of draining in time and conveniently, and a fuel cell system. An oxidizing agent inlet and outlet, a fuel inlet and outlet, and a cooling liquid inlet and outlet, and flow guiding grooves connected with each fluid are formed in the flow guiding bipolar plate; independent and split draining channels are formed in multiple positions of at least one surface of the flow guiding plate; and the draining channels are connected with corresponding flow guiding grooves, so that theaccumulated and generated water in each region where the reactant fluid flows through in the flow guiding grooves can be drained in time through the draining channels. Compared with the prior art, theflow guiding plate can drain water in time, the generated water is shorter in flowing distance in the polar plate flowing channel more smoothly with higher efficiency, thereby effectively eliminatinga phenomenon of water accumulation and water blocking.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and specifically proposes a new fuel cell diversion bipolar plate and a fuel cell system with timely and convenient drainage. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through an electrode reaction. A fuel cell is generally constructed of a plurality of cells, each cell comprising two electrodes (anode and cathode) separated by an electrolyte element and assembled in series with each other to form a fuel cell stack. The electrochemical reaction is achieved by supplying the appropriate reactants to each electrode, ie fuel to one electrode and oxidant to the other, creating a potential difference between the electrodes and thereby generating electrical energy. [0003] In order to supply each electrode with reactants, specific interface elements commonly referred to as "bipolar plates" and arran...

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Problems solved by technology

[0005] This design is to design more fluid inlets and outlets, and design the diversion groove as a straight-flow groove or a near-flow groove as much as possible. Compared with the traditional serpentine flow path, it does reduce the situation of water blocking. Due to the limitation of the size of the flow plate, the design of this straight channel makes hydrogen and air be discharged from the stack before they can react, a large amount of air is wasted or excess hydrogen is circulated, which will inevitably cause the mechanical work of transporting air or circulating hydrogen. consumption increases, thereby reducing the efficiency of the fuel cell system

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