Isolated voltage balancing in super-capacitor energy storage system

With obvious advantages compared to electrolytic power, super-capacitors will be acknowledged as a major component in future power systems. Super-capacitor can compensate shortage in power density of lithium ion battery. Due to the characteristics of capacitor parameters discretion, overcharge or undercharge of monomer capacitance usually occurs in the process of charge or discharge, greatly reducing the lifetime of the capacitor. Compared with the existing technology of balancing, the technique in the research has two advantages: first, the voltage high-precision multi-channel voltage acquisition technology, effectively preventing transient impact of voltage on system with acquisition precision of 1mV; second, isolated intelligent balancing technology, calculating SOC of capacitor through MCU with capacitor and MCU part separated by MOS pipe. Experimental results show that the consistency of capacitor units has been significantly improved using intelligent voltage balancing with excellent performance and high equilibrium speed. The system facilitates dynamic voltage and current equilibrium during the whole process of charging. The design of sharing voltage device in super-capacitor energy storage system proves practically effective in industrial applications, and it can promote the marketing application of lithium ion battery and propel the advancement of new energy sources in the future.