Fuel cell system

Abstract

The invention relates to a fuel cell system which comprises a cell unit consisting of an anode collector layer, a cathode collector layer, a thin film electrode array clipped between the anode collector layer and the cathode collector layer, a frame around the thin film electrode array, the anode collector layer and the cathode collector layer, a hydrophilic resistive gas layer positioned below the thin film electrode array and the frame and a hydrophobic breathable layer arranged below the hydrophilic resistive gas layer, and at least one gas discharge channel which is embedded in the frame,exposes one part of the hydrophilic resistive gas layer and contacts the environment adjacent to the cell unit so as to discharge the gas generated by the thin film electrode array outside the cell unit.

Description

technical field [0001] The present invention relates to a fuel cell system, and in particular to a fuel cell system capable of discharging gas generated by reaction therein. Background technique [0002] Fuel Cell (FC) is a power generation device that uses chemical energy to be directly converted into electrical energy. Compared with traditional power generation methods, fuel cells have low pollution, low noise, high energy density, and high energy conversion efficiency. The advantage is that it is a very future-looking clean energy, which can be applied in various fields such as portable electronic products, household power generation systems, transportation tools, military equipment, space industry, and large-scale power generation systems. [0003] Common fuel cells can be roughly divided into the following five types according to the type of electrolyte used: [0004] 1. Alkaline fuel cell (AFC): Potassium hydroxide is used as electrolyte; [0005] 2. Carbonic acid fu...

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Problems solved by technology

[0014] It can be understood from the reaction formula (1) that when the direct methanol fuel cell operates, there will be CO in the anode part 2 Produced, in order to avoid the accumulation of excessive gas pressure at the anode, CO must be timely 2 Excluded from fuel cell systems, when liquid fuels are used for the anode, CO 2 It is easy to separate and exclude from the liquid, but when using the battery system of gaseous fuel, gaseous fuel and CO 2 will not be easily separated and may allow the gaseous fuel to 2 They are discharged out of the system together, causing fuel loss and affecting the fuel conversion efficiency of the fuel cell. In addition, an anode moisture-retaining layer can be provided so that vaporized methanol can pass through the anode moisture-retention layer and enter the anode gas diffusion layer, but the same water vapor in the anode also It will pass through the anode moisture-retaining layer and diffuse to the fuel storage tank, causing the fuel concentration in the fuel storage tank to be diluted, and will lead to an increase in the internal resistance of the membrane electrode resistance, as disclosed in WO2005 / 112172A1 patent application

In addition, CO can be further set 2 The discharge port is located on the side wall of the gasification fuel storage chamber, as disclosed in patent application WO2006 / 040961A1, and the gasification methanol concentration in the gasification fuel storage chamber is second only to the fuel storage tank, but it causes more gasification. Methanol with CO 2 Exhaust, not only pollute the surrounding environment, but also reduce fuel efficiency

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