The backup power system in the data center faces requirements such as high energy consumption, high load-bearing capacity, and large space. Therefore, we have developed lithium-ion batteries with high power density, high reliability, and high safety to solve these problems. This session will show the structural composition and operating principle of our battery system, as well as its applicability to different backup levels, ranging from 10 minutes to over 2 hours of backup time, as well as our safety design considerations