Method for rapidly evaluating and screening self-discharge state of lithium ion battery

• Main Authors: FANG BOJIE, LIU TONG, GU MEIRONG, MEI YUENI, CHENG GUANGYU, CHEN JIAN, WANG KE
• Format: Patent
• Language: Chinese; English
• Published: 12.01.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The method for rapidly evaluating and screening the self-discharge state of the lithium ion battery comprises the following steps of: forming the battery, charging the battery to a 100% SOC (State of Charge) state, and standing for a fixed time; testing open-circuit voltage and internal resistance of the battery at normal temperature; standing the batteries for a fixed time at room temperature, testing open-circuit voltage and internal resistance of the batteries, calculating voltage drop and internal resistance change of the two tests, and removing the batteries with the voltage drop or internal resistance change greater than a preset value; placing the battery under a high-temperature condition, standing for a fixed time, cooling to room temperature, testing open-circuit voltage and internal resistance of the battery, calculating voltage drop and internal resistance change before and after high-temperature standing, and removing the battery with the voltage drop or internal resistance change greater than a