Bipolar plate for a high-temperature fuel cell, and manufacturing method thereof

Abstract

The invention provides a bipolar plate for a high-temperature fuel cell, and a manufacturing method thereof. In the prior art, the fuel cell stack bipolar plate needs to meet the circulation requirements of fuels, oxidants and cooling mediums. According to the bipolar plate, based on the problem in the prior art, the circumferential surface of a cathode plate is coated with an adhesive material through a screen printing technology and positioning design in a scraping coating manner, wherein the adhesive material meets fuel cell working environment requirements; the cathode plate is precisely aligned to an anode plate through a positioning groove, and standing curing is performed to obtain a bipolar plate; the bipolar plate comprises an anode plate, a cooling channel and a cathode plate, wherein both sides of the cathode plate are respectively provided with a flowing channel, the single surface of the anode plate is provided with a flowing channel, and the cathode plate surface with thecooling medium flowing channel is adhered to the anode plate surface with no flowing channel to form the bipolar plate, and the cooling medium flowing channel is formed between the two plates, such that the cooling medium flowing channel is additionally arranged without the increasing of the thickness; and the adhesive liquid distribution and the thickness can be precisely controlled through thescreen printing technology, such that the two plates can be integrally adhered within a certain adhesive liquid thickness range while the conductivity of the bipolar plate is not affected.

Description

technical field [0001] The invention relates to the technical field of high-temperature fuel cells, in particular to a bipolar plate for high-temperature fuel cells and a manufacturing method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a continuous power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy. Instead of conventional engines, it will become the main source of power for future cars, and can be applied to many fields such as electronic products, aerospace, and fixed power stations. It is one of the ideal forms of "low-carbon economy". [0003] The fuel cell stack bipolar plate (hereinafter referred to as "bipolar plate") is one of the key components of the fuel cell stack system. In the fuel cell stack, the bipolar plate is not only responsible for distributing fuel gas and air, but also realizing the The electrical connection and current collection between the batteries ...

AI Technical Summary

Problems solved by technology

[0006] For the graphite composite bipolar plate used in HT-PEMFC, the cathode and anode cannot be welded like metal plates, or bonded together with conductive adhesive like low temperature fuel cell bipolar plates to meet the circulation of fuel, oxidant and cooling medium , because the operating temperature of HT-PEMFC is as high as 200 ° C, the conductive material of the general conductive tape or conductive glue is conductive carbon powder or metal particles, and the general conductive filler is gold, silver, copper, aluminum, zinc, iron, nickel powder And graphite and some conductive compounds, etc., are affected by components such as resin matrix, conductive particles, dispersing additives and additives. The general conductive tape or conductive glue is used at a temperature of 60-80°C, preferably up to 130°C. Meet the service temperature of HT-PEMFC up to 200℃

There are many choices of high-temperature glue, such as silicone glue, which can withstand temperatures as high as 350°C. However, this type of high-temperature glue is not conductive. If the distribution and thickness of the glue between the two plates are not accurately controlled, the conductivity of the two plates will be affected.

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