초록 ▼

Disclosed is a series connection circuit for secondary batteries for preventing a reduction of energy usable as the builtup battery due to a difference of DOD of the batteries and a difference of voltage detection level of voltage detectors. The circuit includes voltage detectors for detecting the t

Disclosed is a series connection circuit for secondary batteries for preventing a reduction of energy usable as the builtup battery due to a difference of DOD of the batteries and a difference of voltage detection level of voltage detectors. The circuit includes voltage detectors for detecting the terminal voltage of the secondary batteries thereby to calculate the respective values of DOD thereof, transistors for discharging the secondary batteries independently, a charging unit to charge the secondary batteries and a controller for controlling the independent discharging operation of the transistors corresponding to the respective values of DOD. With the arrangement mentioned above, it is possible to equalize the values of DOD, whereby the reduction of usable energy caused by the increasing of difference of DOD can be prevented.

대표청구항 ▼

A series connection circuit for builtup battery consisting of a plurality of secondary batteries which are connected in series with each other, each of said batteries having a terminal voltage changeable corresponding to a value of DOD (Depth of discharge: %), said circuit comprising: voltage detect

A series connection circuit for builtup battery consisting of a plurality of secondary batteries which are connected in series with each other, each of said batteries having a terminal voltage changeable corresponding to a value of DOD (Depth of discharge: %), said circuit comprising: voltage detecting means for detecting the terminal voltage of said secondary batteries thereby to calculate the respective values of DOD thereof; discharge switching means for discharging said secondary batteries independently; charging means connected with both ends of said builtup battery to charge said secondary batteries; and control means for controlling the independent discharging operation of said discharge switching means corresponding to the respective values of DOD obtained by said voltage detecting means.