Protective circuit for a secondary battery pack and method of operating the same
AssigneeSamsung SDI Co., Ltd.
InventorJong Sam Kim
Life of this patent
Estimating the term…
Abstract
A protective circuit for a secondary battery pack advantageously having a simple circuit configuration while maintaining the safety of banks in the circuit. Each protective circuit has banks adapted to be charged or to discharge voltage, each bank being coupled to a controller that senses the charging or discharging voltage of the bank and outputs a predetermined value if overcharging or over-discharging is sensed. A level shifter is adapted to shift the voltage output from the controller to an adjusted voltage approximately equal to the voltage output from one of the other controllers. A switching means controls the stopping of charging or discharging of the banks.
Claims17
A protective circuit for a secondary battery pack comprising
- a first bank to be charged or discharged and having cells coupled in series and in parallel, and
- a second bank to be charged or discharged and coupled in series to the first bank and having a plurality of cells coupled in series and in parallel, the protective circuit comprising:
- a first controller for sensing a charging or discharging voltage of the first bank and outputting a first controller output voltage if overcharging or over-discharging is sensed;
- a second controller for sensing a charging or discharging voltage of the second bank and outputting a second controller output voltage if overcharging or over-discharging is sensed;
- a level shifter for
- adjusting the second controller output voltage to an adjusted voltage output having about a same voltage level as the first controller output voltage;
- a first switch adapted to be toggled on/off in response to the first controller output voltage or the adjusted voltage output from the level shifter;
- and
- a second switch coupled with a large-current line for charging or discharging each of the first bank and the second bank, and adapted to be toggled on/off to stop the charging or discharging of the first bank and the second bank in accordance with whether the first switch is toggled on/off.
A secondary battery pack comprising:
- a first bank to be charged or discharged and having cells coupled in series and in parallel;
- and
- a second bank to be charged or discharged and coupled in series to the first bank and having a plurality of cells coupled in series and in parallel;
- and
- a protective circuit comprising:
- a first controller for sensing a charging or discharging voltage of the first bank and outputting a first controller output voltage if overcharging or over-discharging is sensed;
- a second controller for sensing a charging or discharging voltage of the second bank and outputting a second controller output voltage if overcharging or over-discharging is sensed;
- a level shifter for adjusting the second controller output voltage to an adjusted voltage output having about a same voltage level as the first controller output voltage;
- a first switch adapted to be toggled on/off in response to the first controller output voltage or the adjusted voltage output from the level shifter;
- and
- a second switch coupled with a large-current line for charging or discharging each of the first bank and the second bank, and adapted to be toggled on/off to stop the charging or discharging of the first bank and the second bank in accordance with whether the first switch is toggled on/off.
Dependencies are inferred from the claim text.