Prediction and control of corrosion in pouch Li-ion battery
20 Ah lithium iron phosphate pouch Li-ion battery is taken as the research object,the reliability and feasibility of determination based on side voltage (voltage between cathode tab and aluminum laminated film) and side resistance (resistance between anode tab and aluminum laminated film) for the corrosion of aluminum laminated film are compared.Ion short-circuit can be determined by measuring the damage area of the polypropylene (PP) layer by electrochemical copper plating method.It is found that the side resistance is more accurate than the side voltage to determine ion short-circuit.The electronic short-circuit is simulated by paralleling different electric resistances between the anode tab and the aluminum laminated film.It is found that the side voltage is more accurate than the side resistance to determine electronic short-circuit.According to the statistics of battery production process data,the ion short-circuit cannot be completely avoided,so controlling electronic short-circuit is a better choice to prevent the corrosion of pouch batteries.The corrosion current of aluminum foil is tested by the three-electrode method,and the corrosion life of aluminum laminated film under different side voltages is calculated and predicted.Controlling the side voltage value lower than 2.413 V can ensure that the pouch battery does not undergo corrosion leakage during the service life.
国家科技期刊平台
NSTL
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