System and method for testing performance of large-area flat-plate SOFC single battery

Abstract

The invention discloses a system and a method for testing an SOFC single battery. The test system comprises an electronic load, a test room, and a single battery sealing member, a Pt sheet and a Ni sheet current collection layer which are arranged in the test room, wherein the Pt sheet and the Ni sheet current collection layer are connected with the electronic load respectively through a first high-temperature resistant conducting wire, the single battery sealing member is connected with the electronic load through a second high-temperature resistant conducting wire, the test room is connected with ventilating pipes of a cathode inlet, a cathode outlet, an anode inlet and an anode outlet, an anode air flow channel of the single battery sealing member adopts a foam nickel air flow channel, and a cathode air flow channel adopts a platinum gauze wrapped LSM air flow channel. The system is characterized in that the platinum gauze wrapped LSM air flow channel is used as the cathode air flow channel of the single battery, the foam nickel air flow channel is used as the cathode air flow channel, and simultaneously a thick silver wire is used as a current lead wire, thus the system reduces the high-temperature contact resistance and the conducting wire resistance, is advantageous for performing direct current discharge test on the single battery, and reduces the voltage obtained in the discharge process of the single battery to less than 0.5 V.

Description

technical field [0001] The invention relates to a single cell testing technology, in particular to a large-area flat SOFC single cell performance testing system and testing method. Background technique [0002] Solid Oxide Fuel Cell (SOFC for short, Solid Oxide Fuel Cell) has high energy conversion efficiency, environmental friendliness (no combustion process, almost no emission of nitrogen and sulfur oxides, low noise), wide fuel adaptability and reliability Advanced features, known as the 21st century green energy. Solid Oxide Fuel Cell (SOFC) has two types of structures, flat plate and tubular. Flat plate SOFC has the advantages of high power density, simple preparation process, and low preparation cost, which makes medium and low temperature flat plate SOFC become the current research topic of SOFC at home and abroad. Hotspots, especially the testing of the sealing degree and discharge performance of flat SOFC single cells. At present, there are literature reports abou...

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Problems solved by technology

At present, there are literature reports about the test technology of flat SOFC cells, which mainly adopt button batteries with small effective area as the test object, without the need of gas flow channel, because the effective area of ​​the test object (button cell) is small, it cannot Comprehensive response to single-cell performance, with limitations

For the test technology of large-area planar SOFC single cells, the Pt (platinum) sheet collector layer, single cell sealing body, Ni (foam nickel) sheet collector layer are usually installed in the test room in sequence, and the Pt sheet collector layer and single There are gaps between the battery seals to form the cathode gas flow channel of the single cell, there are gaps between the single cell seal and the Ni sheet collector layer to form the anode gas flow channel of the single cell, the Pt sheet collector layer and the Ni sheet collector The current lead is connected to the electrical layer, and the voltage lead is connected to the cell sealing body. The current and voltage are measured through the electronic load connected to the current lead and the voltage lead, so as to realize the test of the sealing performance and discharge performance of the single cell, but this Due to the existence of the cathode and anode gas flow channels, the current flow through the cathode and anode gas flow channels is greatly hindered, resulting in unsatisfactory test results and low reliability. In order to solve this problem, a single cell cathode has also been proposed. The gas channel is made of strontium-doped lanthanum manganate (LSM, La 1-x Sr x MnO 3 ) processed gas channel (hereinafter referred to as the LSM gas channel), although the LSM gas channel can reduce the high-temperature contact resistance, but the high-temperature contact resistance of the LSM gas channel is still relatively large, and the current collection effect is still relatively poor, and the anode The gas flow channel has not been improved, making the SOFC single cell performance test results still unsatisfactory

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