Self wetting micro high efficiency thermal self circulation cooling proton exchange fuel cell system

Abstract

The fuel cell system is composed of integrative galvanic pile module and recirculation cooler of micro channel (RCMC). The galvanic pile includes terminal plates, afflux metal plate, and single cell units (SCU) connected to each other. Fuel inlet and outlet are made on terminal plates. Two terminal plates are positioned on two ends of the galvanic pile module. Through rubber pads, inner sides of two terminal plates are jointed to two pieces of afflux metal plate. One or more SCU are jointed between two pieces of afflux metal plate. SCU consists of jointed bipolar plate of graphite and electrode of self-humidified membrane. RCMC includes condenser tube, micro channel built in bipolar plate of graphite, and tiny check valve at entrance. Through tiny check valves at entrance and exit, two ends of condenser tube are connected to micro channel. Features are: preventing membrane from dehydration, discharging quantity of heat effectively so as to keep electrical property in good state.

Description

technical field [0001] The invention relates to fuel cell technology, in particular to a self-humidification miniature high-efficiency thermodynamic self-circulation cooling proton exchange membrane fuel cell system. Background technique [0002] Proton exchange membrane fuel cell is the fifth generation fuel cell which is developing rapidly after alkaline fuel cell, phosphoric acid fuel cell, molten carbonate fuel cell and solid oxide fuel cell. It has the advantages of cleanliness, low noise, low operating temperature, high current density, high energy conversion efficiency, and environmental friendliness. It is the most promising power source for pollution-free and zero-emission electric vehicles. In addition to the fuel cell stack, this fuel cell system also needs auxiliary systems such as fuel and oxidant supply systems, electronic intelligent control, and heat dissipation devices. The fuel hydrogen supply generally has a hydrogen humidificat...

AI Technical Summary

Problems solved by technology

[0004] 1. For a proton exchange membrane fuel cell that uses air at atmospheric pressure as an oxygen source, if air extraction or blowing is used as its power, when the air passes through the through-type flow channel of the bipolar plate of the stack, the water will flow from the cathode to the anode. The reverse osmosis phenomenon is weakened. If the hydrogen gas in the anode is not humidified, the membrane on the anode side will be dehydrated, thereby further reducing the electrical performance of the originally low-power stack.

[0005] 2. The proton exchange membrane fuel cell system that uses an external humidification system and a compressor to provide a high-pressure oxygen source is bulky, heavy, and not compact in structure, and is not suitable for use as a mobile power source, especially as a mobile vehicle Power supply

If the heat energy generated during operation cannot be released in time, the temperature of the battery stack will be too high, which will lead to dehydration of the membrane, the proton conductivity of the membrane will decrease, and the performance of the battery will deteriorate.

[0007] 4. The traditional water cooling system contains a circulation pump. Since it is only liquid-phase heat transfer, the temperature difference between the inlet and outlet is not large. When there is more heat, more water is needed, which makes the whole system too complicated and bulky; It dissipates less heat and cannot solve the problem of dehydration of the anode side membrane well, so it is not suitable for power sources with high heat generation

[0008] 5. The working temperature of the air-cooled stack is low (about 40°C), the catalytic activity of the electrode electrocatalyst is low, and the output power of the stack is also very low

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