Cathode protection system and method for air battery

Abstract

The invention discloses a cathode protection system and method for an air battery. The system comprises: an oil storage tank, a metering pump, an electrolyte liquid storage tank, an electrolyte pump and an electrolyte venting valve. The inlet and outlet of the oil storage tank are connected to the metering pump through oil conveying pipelines. The metering pump is connected to an oil-way inlet andan oil-way outlet of the air battery through an oil conveying pipeline. The outlet of the electrolyte liquid storage tank is connected to the electrolyte pump through a liquid conveying pipeline. Theelectrolyte pump is connected to the electrolyte inlet of the air battery through a liquid conveying pipeline. The inlet of the electrolyte liquid storage tank is connected to the electrolyte ventingvalve through a liquid conveying pipeline. The electrolyte venting valve is connected to the electrolyte outlet of the air battery through a liquid conveying pipeline. By implementing the system andmethod of the invention, the problem of severe anode corrosion under the open state of the metal air battery is solved, and the metal air battery system is promoted to be practical and market-oriented, so that the large-scale application of the metal air battery can be realized.

Description

technical field [0001] The invention relates to the technical field of metal-air batteries, in particular to a cathodic protection system and method for air batteries. Background technique [0002] A metal-air battery uses a metal with a relatively negative electrode potential, such as magnesium, aluminum, zinc, mercury, iron, etc. as the negative electrode, and uses oxygen or pure oxygen in the air as the positive electrode. Metal-air batteries have attracted much attention for their ultra-high theoretical specific energy (for example, the theoretical specific energy of aluminum metal-air batteries is 8046Wh / kg), and are considered to be the most promising options for off-grid energy supply systems and power plant range extension. power supply. However, since the metal activity of the anode is greater than that of hydrogen, the metal anode will undergo a hydrogen evolution reaction in aqueous solution, and there will be a serious self-corrosion reaction. Under no-load cond...

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Problems solved by technology

[0008] However, the above-mentioned solutions are all at the expense of specific energy and specific power of the battery. Alloying and hydrogen evolution inhibitors can effectively reduce the corrosion rate of air batteries under working conditions, but additional solutions and related containers are required in open-circuit conditions. ; Although the use of gel and ionic liquid electrolytes can reduce the corrosion rate of the anode by about three orders of magnitude, it will also reduce the conductivity of the electrolyte at the same time, thereby significantly reducing the specific power of the battery. These methods make the system structure and control system complex , difficult to commercialize

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