Analytical Study on Characteristics of Lithium-ion Battery after Applying High Voltage Impulse

摘要

Recently, Lithium-ion Batteries (LiB) have begun to be introduced for electric vehicles and power leveling. In power leveling, it is conceivable that LiB is connected to the grid. Therefore, the possibility that a high voltage pulse such as induced lightning will be applied to LiB must be considered, but it has hardly studied academically. Thus, in this study, high-frequency high-voltage pulse was applied to LiB and its effects were investigated. First, considering the inductance and ground capacitance of the transmission line, high impedance LiB was made by reducing the electrode area. Second, using an impulse noise simulator, voltage pulses with a pulse width of 0.4 [μs] and a voltage of 1 [kV] were applied ten times to the prepared high impedance LiB. It was expected that the capacity of LiB would decrease due to high voltage pulse, however it hardly changed. On the other hand, in the AC impedance analysis of the LiB after applying the high voltage pulse experiment, it was found that the arc of the high frequency side became smaller.