The main parameter indexLithium ion batteries have high energy density, high conversion efficiency, long cycle life, no memory effect, no charge and discharge time delay, low self-discharge rate, width, and environment friendly advantages such as working temperature range, thus it becomes an ideal carrier of electric power and has been widely used in various fieldsIn general, we in the use of lithium ion battery, it will focus on some technical indicators, as the main factor to measure its performance "and".