The lithium‐ion battery has the characteristics of low internal resistance, as well as little voltage decrease or temperature increase in a high‐current charge/discharge state. The battery is expected to be used not only in a transportation uses such as electric vehicles (EV), but also for stationary energy storage such as in the stabilization of renewable energy, the adjustment of power grid frequency and power peak‐shaving in factories. Mitsubishi Heavy Industries, Ltd. (MHI) has been developing a large‐scale energy storage system (ESS) using 50Ah‐class P140 lithium‐ion batteries that we developed. This report will describe the development status and application examples.
