A kind of pem stack and system for cold start staged preheating

Abstract

The invention discloses a PEM electric pile with a cold start different-stage preheating mode, and a system. The PEM electric pile is divided into three assemblies by thermal isolation structures, wherein the first assembly comprises a bipolar plate and an MEA assembly; the second assembly comprises end plates, an insulating plate and a collector plate assembly; the third assembly comprises a cooling medium and a pipeline and equipment; the thermal isolation structures comprise a thermal isolation structure arranged on the inner wall of a fuel supply system, a thermal isolation structure arranged on the inner wall of a cooling medium circulation system, and a thermal isolation structure arranged on the inner wall of an oxidizing agent supply system and a thermal insulation plate; the end plates are positioned on the two sides of the electric pile, and inlet-outlet channels of the fuel supply system, the oxidizing agent supply system and cooling medium circulation system are formed in the end plates; the insulating plate is positioned between the end plates and the thermal insulation plate; a groove is formed in one side close to the thermal insulation plate, and the thermal insulation plate is placed in the groove; the thermal insulation plate is positioned in the insulating plate groove for isolating the first assembly and the second assembly; a groove is formed in one side close to the collector plate, and the collector plate is arranged in the groove; and the collector plate is embedded in the insulating plate groove.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a PEM electric stack and system for staged preheating at cold start. Background technique [0002] Proton exchange membrane fuel cells have the advantages of high energy conversion efficiency, environmental friendliness, and no noise, and have become the preferred power source to solve the problems of environmental pollution and energy depletion. [0003] When the proton exchange membrane fuel cell is working, there is a large amount of water inside, including the water generated by the reaction and the water used for humidification during the reaction. In the low temperature environment of the proton exchange membrane fuel cell, the liquid water inside the battery may freeze, which may make it difficult to start, prolong the start-up time, and damage the membrane electrode structure. [0004] In order to ensure successful start-up, the stack needs to be prehea...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems in the prior art that the preheating method of the fuel cell stack does not consider the thermal insulation structure of the fuel cell stack and the system during the staged preheating, so that the preheating energy consumption is large and the preheating speed is slow, etc., to provide a suitable fuel cell stack. PEM stack and system for graded preheating during cold start

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