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A high temperature fuel cell stack

A fuel cell stack and high temperature technology, applied in fuel cells, fuel cell additives, solid electrolyte fuel cells, etc., can solve problems such as difficult water discharge and flooding, reduce corrosion, increase battery life, and improve stability Effect

Active Publication Date: 2020-01-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the water generated in the high-temperature proton exchange membrane fuel cell system is difficult to discharge during the start-stop process and cause flooding, and proposes an effective water removal method

Method used

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  • A high temperature fuel cell stack
  • A high temperature fuel cell stack
  • A high temperature fuel cell stack

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Experimental program
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Effect test

specific Embodiment approach

[0019] Specific implementation methods include:

[0020] End plate 1, used for fluid distribution and current collection; Molecular sieve coating 2, removes water during battery startup and shutdown; Anode catalyst layer 3, Catalyzes the oxidation reaction of fuel; Proton exchange membrane 4, Transports protons, isolates cathode and anode reactants ; The cathode catalytic layer 5 catalyzes the reduction reaction of oxygen; the bipolar plate 6 distributes the fluid of the cathode and anode reactants. working principle:

[0021] The molecular sieve coating 2 is coated on the flow channel of the end plate 1 and the bipolar plate 6, the anode catalytic layer 3, the proton exchange membrane 4 and the cathode catalytic layer 5 together form a membrane electrode assembly MEA, and the MEA is assembled with the end plate and the bipolar plate and between the bipolar plates.

[0022] High-temperature proton exchange membrane fuel cells use PBI membranes, and their proton transport doe...

Embodiment approach 1

[0024] Embodiment 1: In this embodiment, 20 single cells are placed between two end plates to form a high-temperature fuel cell stack, and the inner surface of the end plate near the single cell and the surfaces on both sides of the bipolar plate are coated with 3A molecular sieve coating. Layer, the thickness of the molecular sieve membrane is 0.005mm.

[0025] The high-temperature fuel cell stack assembled in this way did not find obvious decline in battery performance after continuous start and stop 100 times, while the high-temperature fuel cell stack coated with the molecular sieve membrane was tested under the same conditions as the above-mentioned high-temperature fuel cell stack After 73 times of starting and stopping, there was an obvious decline in battery performance due to flooding. Through the comparison of the two methods, it is found that the above method can effectively improve the flooding phenomenon caused by the high-temperature fuel cell stack during start-...

Embodiment approach 2

[0026] Embodiment 2: In this embodiment, 20 single cells are placed between two end plates to form a high-temperature fuel cell stack, and the inner surface of the end plate near the single cell and the surfaces on both sides of the bipolar plate are coated with 5A molecular sieve coating Layer, the thickness of the molecular sieve membrane is 0.01mm.

[0027] The high-temperature fuel cell stack assembled in this way did not find obvious decline in battery performance after continuous start and stop 100 times, while the high-temperature fuel cell stack coated with the molecular sieve membrane was tested under the same conditions as the above-mentioned high-temperature fuel cell stack After 73 times of starting and stopping, there was an obvious decline in battery performance due to flooding. Through the comparison of the two methods, it is found that the above method can effectively improve the flooding phenomenon caused by the high-temperature fuel cell stack during start-up...

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Abstract

A high temperature fuel cell stack, comprising two end plates and a single cell placed between the two end plates, the single cell includes a bipolar plate and a membrane electrode, on the inner side of the end plate close to the single cell The surface and / or the surfaces of both sides of the bipolar plate are coated with a molecular sieve coating. According to the design of the invention, the problem of battery performance degradation caused by water not being discharged in time during the start-up and shutdown of the high-temperature proton exchange membrane fuel cell can be effectively solved. Improve the stability of the battery during operation, so that the battery life can be improved. It solves the flooding phenomenon caused by the generated water not being removed in time during the operation of the battery, reduces the corrosion of the catalyst carrier, noble metal catalyst and diffusion layer in the membrane electrode, and improves the stability of the membrane electrode. The water removal method of the invention has a simple structure and can effectively remove water without adding external facilities.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a high-temperature fuel cell stack. Background technique [0002] A fuel cell is a device that converts chemical energy stored in compound fuels directly into electrical energy through a chemical reaction. A proton exchange membrane fuel cell usually consists of an anode, a cathode and a proton exchange membrane. During the operation of the battery, the fuel undergoes an oxidation reaction on the surface of the anode catalyst to generate protons and electrons. The protons reach the cathode through the proton exchange membrane, oxygen undergoes a reduction reaction with the protons on the surface of the cathode catalyst to generate water, and the electrons do work through the external circuit to reach the cathode. [0003] A large amount of water will be generated during the discharge process of the proton exchange membrane fuel cell. Due to the high operating temperature of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/247H01M8/12H01M8/0228H01M8/04291
CPCH01M8/0228H01M8/04291H01M8/12H01M8/247Y02E60/50
Inventor 孙公权孙雪敬杨林林孙海戚甫来
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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