Bipolar plate of fuel cell

Abstract

The invention provides a bipolar plate of a fuel cell. The bipolar plate comprises a polar plate I and a polar plate II which have the same structure, wherein each of the two polar plates comprises agas flow channel, a rib, a first plane, a second plane and a third plane, the first plane is a reference plane of the metal polar plate, the first plane comprises a gas transition area and a sealing ring plane, the second plane is a gas flow channel bottom plane, the second plane is higher than the first plane, gas enters an inlet of a flow channel from the transition area and is in a step shape.After the two polar plates are buckled, an interlayer is formed between the bottom planes of the two gas flow channels, and the interlayer provides a flowing channel for cooling liquid; each gas flowchannel of the polar plate further comprises a cylindrical recess and a hemispherical bulge, and circle centers of the cylindrical recesses and hemispherical bulges are uniformly distributed on the central axis of the gas flow channel at intervals.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to the field of a metal bipolar plate structure in a fuel cell stack and a cooling liquid channel in the fuel cell. Background technique [0002] Since the industrial revolution, clean and cheap energy has gradually become the driving force for the world's increasingly prosperous and economic development. The use of traditional energy sources such as oil, coal, and natural gas has an increasingly significant impact on the environment, and these energy sources are limited energy sources. Unrestricted use will accelerate the depletion of the earth's energy sources. In the face of these problems, the development of fuel cell technology has made breakthroughs in recent years, and the use of fuel cells in the world has also entered a new stage. Fuel cells are used for power supply in automobiles, aerospace and other fields. [0003] The bipolar plate is one of the core components of the fuel c...

AI Technical Summary

Problems solved by technology

The premise that the patent is beneficial to drainage requires the placement direction of the fuel cell (the flow direction of the reaction gas is vertical, and the flow direction is from top to bottom. If it is placed horizontally, flooding will easily occur, and the water generated in the flow channel will easily converging at the bottom of the concave-convex flow channel); the patent requires that the metal plate be processed in two directions, and the stamping process at the intersection of the double flow channel will cause the chamfering radius to be too large, which will affect the structure of the flow channel and the strength of the overall fuel cell, thereby affecting battery performance

The flow channel type coolant is affected by the size of the coolant flow channel, and the flow rate is required to be small, and the cooling efficiency is low. If the flow rate is increased, the pressure will increase. Due to the complex internal structure, the strength of the metal plate is higher. Otherwise, the metal plate will be deformed and affect the performance of the battery

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