Electrical characteristics analysis of 18650 lithium-ion battery pack with the earthquake vibration condition

Abstract

Nowadays, the usage of lithium-ion batteries is an increase highly for electric vehicles (EVs), energy storage systems (ESSs), and portable electrical devices. The electrical characteristics of lithium-ion batteries are changed by discharge/charge current magnitudes, depth of discharge (DoD), environment temperature, degradation, and so on. In addition, the mechanical stress such as vibration and shock are degraded due to deformation of electrode or stress of electrolyte. The previous literatures of vibration are limited to the conditions of electric vehicle and satellites. These vibrations are tested on a single axis. However, earthquake vibration is applied to three axes simultaneously. A lot of literatures have analyzed the change of single cell's electrical characteristics with mathematical analysis method. In this paper, lithium-ion battery module which is consisted of 14 series and 20 parallel by 18650 cylindrical cells is tested to analyze the change of electrical characteristics such as cell-to-cell voltage difference, internal resistance, discharge capacity and temperature difference in module by the earthquake vibration.