A high temperature methanol fuel cell stack with spaced cooling cavity

Abstract

The present invention provides a high temperature methanol fuel cell stack with spaced cooling cavities. The invention includes: a stack unit package integrating a proton exchange membrane, a bipolar plate and a cooling cavity. The cooling cavity includes a detachable first cooling plate and a second cooling plate that can be closely attached. The bonding surfaces of the first cooling plate and the second cooling plate are provided with evenly arranged cooling oil passages. The present invention can not only greatly enhance the overall The heat dissipation capacity of the stack itself, and at the same time, the cooling liquid is circulated in the cold zone cavity composed of the cooling units between each stack unit, so that the heat transfer between each stack unit is fully isolated, preventing the If the number of sections is too large, the heat generation in the middle of the stack will be concentrated after the length of the stack increases, resulting in high temperature in the middle of the stack and inconsistent temperature of the entire stack where the temperature at both ends is low. The overall structure of the invention is compact, and the integrally sealed cooling cavity and the layered bipolar plate also solve the problem that the cooling oil easily contaminates the membrane electrode in the prior art.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a high-temperature methanol fuel cell stack with spaced cooling cavities. Background technique [0002] Fuel cell is a high-efficiency power generation device that directly converts the chemical energy of fuel into electrical energy through chemical reaction without combustion. It has the advantages of high power generation efficiency, less environmental pollution, high reliability and easy waste heat removal. Methanol aqueous solution is used as a fuel, a new type of power source that uses the chemical energy stored in methanol to convert into electrical energy. The high temperature methanol fuel cell further increases the working temperature of the power source compared to the working temperature of the direct methanol fuel cell or the hydrogen fuel cell, and the normal working temperature range is maintained at 160-180 °C. Increasing the working temperature of the power so...

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Problems solved by technology

[0004] Since the high-temperature methanol fuel cell itself will generate a large amount of waste heat during the working process, as the current density of the stack increases, the heat production will also increase. In the case of failure, the existing technology mostly uses coolant to conduct heat, and the sealing of the coolant circulation pipeline can easily lead to membrane electrode pollution, thereby causing serious damage to the stack. At the same time, the arrangement of the cooling system in the prior art It also makes the internal temperature of the battery not uniform enough, and the amount of maintenance in the later period is large.

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