Lithium ion battery self-discharge screening and matching method

• Main Authors: QIU FENG, ZHOU DEQING, WANG YONGJUN, ZHANG QIANBING, SU XIAOLIU
• Format: Patent
• Language: Chinese; English
• Published: 24.04.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a lithium ion battery self-discharge screening and matching method. The method comprises the steps of charging a capacity-graded battery to a preset state of charge, and selecting alternative batteries of which the battery voltage is within a set range; According to the method, the battery is capacity-graded; the battery with the first-grade capacity is tested, meanwhile, the subsequent voltage difference and the numerical value of the DC internal resistance DCIR are analyzed, so as to guarantee that the difference among the capacity, the self-discharge voltage and the internal resistance of the assembled battery is small; the problems of large voltage difference, rapid capacity attenuation and the like in the using process of the lithium ion battery due to mismatching of the assembled battery are solved; high-temperature shelving of the battery is beneficial to infiltration of the electrolyte of the lithium ion battery, and micro short-circuit points in the battery can be aggravated du