A secondary battery system is a secondary battery system including a battery bank including a battery rack including a plurality of battery cells connected in series and a power converter for charging and discharging a power system by one or a plurality of...

An electric energy storage device which includes four energy units with a substantially same voltage value is provided. Each energy unit is provided with a positive electrode and a negative electrode. The electric energy storage device comprises a socket w...

The present application discloses a battery charging case, the battery charging case includes a feeding module, a charging module, and a discharging module. The charging module includes a charging compartment, a screening assembly, and a classification ass...