Device and method for stabilizing of voltage of energy storage

PURPOSE: A voltage stabilizing device and method of an energy storing body are provided to minimize system resources which is required for voltage stabilization and to expand life time of a module or unit cell by alleviating deterioration of the unit cell. CONSTITUTION: A bypass part is easily formed by using a bypass circuit which is serially connected to a switch(SW1). A controller(10) executes a monitoring action by detecting voltage of unit cells(110). The controller generates a signal operating the bypass part by comparing detected voltage with reference voltage. The controller comprises a voltage detecting part(11) detecting the voltage of each unit cells, and a control signal generating part(12) which creates a control signal delivered to the bypass part. The controller comprises a storing means of a memory for storing data including the detected voltage and the reference voltage, and a processer for operating all kinds of control commands and calculation. An analog circuit part(20) turns on a first switch.