Continuous Active Balancing for Sodium-Ion Batteries: HiNA 50kW/100kWh Case Study

This paper presents an intelligent continuous active Battery Management System (BMS) implementation in sodium-ion battery (SIB) energy storage systems (ESS). The 50kWh/100kWh SIB-ESS demonstration project by HiNa Battery Technology Co., Ltd. (HiNa), demonstrates better discharge voltage differential consistency 102mV (vs. 240mV without continuous active BMS) and achieving 97.6% capacity retention after 1,500 cycles. The average round-trip efficiency of the 50 kW/100 kWh energy storage station is 93.9%. The demonstration application of full-time active balancing in sodium-ion battery energy storage power stations provides valuable support for the further promotion of large-scale energy storage.