Lithium ion battery thermal runaway safety assessment method under vibration working condition

• Main Authors: WANG GANG, HE MINGZE, HOU ZHENKANG, LI YANG, LI WENHUA, HAO YONGYAO
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a lithium ion battery thermal runaway safety assessment method under a vibration condition. The method comprises the following steps: S1, acquiring a vibration characteristic data set; s2, under the vibration working condition of the vibration characteristic data set, performing a cyclic charge-discharge aging test on the tested battery to obtain a plurality of discharge data sets; s3, traversing all the discharge data sets to obtain a test battery discharge capacity change curve; s4, dividing a test battery discharge capacity change curve to obtain at least three aging attenuation stages; s5, calculating a standard attenuation parameter set of each aging attenuation stage; s6, establishing a battery capacity evaluation model; s7, inputting the predicted discharge data into the battery capacity evaluation model to obtain the predicted battery discharge capacity of the ith charge-discharge cycle of the to-be-evaluated battery; s8, analyzing the aging stage of the battery, and obtaining a