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Thermal management method for high temperature proton exchange membrane fuel cell system

A fuel cell system and proton exchange membrane technology, applied in fuel cell heat exchange, fuel cell additives, etc., can solve the problems of catalyst aggregation, battery performance degradation, open circuit voltage drop, etc., and achieve good temperature control stability and operation Reliable and stable, the effect of maintaining stability

Active Publication Date: 2013-04-17
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

In fact, high-temperature direct parking will cause carbon corrosion and catalyst aggregation to intensify under the action of the hydrogen-air interface, which may lead to accelerated decline in fuel cell performance
During the research process, we found that the performance of the high-temperature direct parking battery has dropped significantly, and the open-circuit voltage has dropped significantly after the battery restarts many times, and the battery performance is extremely poor and cannot be measured.

Method used

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  • Thermal management method for high temperature proton exchange membrane fuel cell system
  • Thermal management method for high temperature proton exchange membrane fuel cell system
  • Thermal management method for high temperature proton exchange membrane fuel cell system

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Embodiment 1

[0030] Such as figure 1 Shown is the flow chart of the thermal management system of the proton exchange membrane fuel cell. The thermal management system is composed of temperature sensors, heat exchangers, circulating fluid storage tanks, circulating pumps, two-position two-way solenoid valves and other components. In this embodiment, 10 sections and an effective area of ​​276cm 2 The fuel cell stack adopts pure hydrogen and pure oxygen as fuel and oxidant, the operating temperature of the battery is 110°C, and 90% (volume concentration) ethylene glycol aqueous solution is used as the circulating fluid. In this embodiment, a high-precision constant temperature oil bath (ie, a circulating fluid storage tank) is used, and a tubular radiator (ie, a heat exchanger) is installed in the oil bath as a temperature control device. The oil bath box integrates the functions of heating, temperature control and circulation, so it is more suitable for use in the test system; and the insta...

Embodiment 2

[0037] In this embodiment, a single section with an effective area of ​​276cm 2 The fuel cell was tested with different parking strategies. The above-mentioned fuel cell test system was also used. The operating conditions of the battery were: the reaction gas was pure hydrogen / oxygen, the relative humidity was 59%, the operating pressure was 0.2MPa, and the operating temperature was 110°C. The parking policy is as follows:

[0038] S1: When the battery is discharged at a constant current of 138A, disconnect the load directly, stop at high temperature, and after the pressure in the battery drops to normal pressure, purge the battery with N2 for 5 minutes.

[0039] S2: When the battery is discharged at a constant current of 138A, open the two-position two-way solenoid valve to open, the cooling water cools down the ethylene glycol aqueous solution, and gradually operate the battery temperature. When the battery reaches 60°C, disconnect the load and stop. After the battery press...

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Abstract

The invention relates to a thermal management method for a high temperature proton exchange membrane fuel cell system. The fuel cell system comprises a cooling medium circulating subsystem which comprises a circulating pump, a circulation liquid storage tank and a heat exchanger, wherein the circulation liquid storage tank is filled with a cooling medium which serves as circulation liquid; and the boiling point of the circulation liquid is higher than the operating temperature of a stack or a fuel cell which is between 100 and 200 DEG C, and the circulation liquid has low viscosity, low volatility and nonconductive property. The thermal management method is simple in process and is reliable and stable in operation, a parking policy in the thermal management method is favorable for maintaining the performance stability of the fuel cell, and the thermal management method is suitable for the thermal management of the high temperature proton exchange membrane fuel cell system.

Description

technical field [0001] The invention relates to proton exchange membrane fuel cell system integration and operation technology, in particular to a thermal management technology and start-stop strategy of high-temperature proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency, clean, and environment-friendly power generation device. It is an ideal power source for electric vehicles. application prospects. However, the widely used The representative perfluorinated sulfonic acid membrane fuel cell usually operates at a temperature lower than 80°C, which makes the fuel cell face problems such as poor CO tolerance and difficult water and heat management of the system in practical application. Therefore, increasing the operating temperature of PEMFC to above 100°C, commonly known as high-temperature proton exchange membrane fuel cell (HT-PEMFC), is an important development direction of PEMFC technology. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/04007
CPCY02E60/50
Inventor 李晓锦柯长春洪有陆邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI