Cell balance device and battery system
AssigneeSeiko Instruments Inc.
InventorsAtsushi Sakurai, Hiroshi Saito
Life of this patent
Estimating the term…
Abstract
Provided are a cell balance device for protecting a switch circuit from an overcurrent flow. The cell balance device includes: a plurality of electric accumulator connection terminals each connected to one of a node and two terminals of electric accumulators connected in series; a voltage hold device connection terminal connected to a voltage hold device; a plurality of first switch circuits provided between the plurality of electric accumulator connection terminals and the voltage hold device; a control circuit for controlling ON/OFF of the plurality of first switch circuits based on a synchronization signal; and an overcurrent detection circuit for detecting an overcurrent flowing through each of the plurality of first switch circuits.
Claims4
A cell balance device for a battery system for adjusting a cell balance of a plurality of electric accumulators connected in series, the cell balance device comprising:
- a plurality of electric accumulator connection terminals each configured to connect to one of a node and two terminals of the plurality of electric accumulators;
- a voltage hold device connection terminal configured to connect to a voltage hold device;
- a plurality of first switch circuits between the plurality of electric accumulator connection terminals and the voltage hold device;
- a receiving terminal for receiving a synchronization signal;
- a transmitting terminal for transmitting the synchronization signal;
- a control circuit for controlling ON/OFF of the plurality of first switch circuits based on the synchronization signal;
- and
- an overcurrent detection circuit for detecting an overcurrent flowing through each of the plurality of first switch circuits.
A battery system, comprising:
- a plurality of electric accumulators connected in series;
- a plurality of voltage hold devices connected in series;
- a clock generation circuit for outputting a synchronization signal;
- and
- a plurality of the cell balance devices,
- wherein the plurality of the cell balance devices each comprise:
- a plurality of electric accumulator connection terminals each connected to one of a node and two terminals of the plurality of electric accumulators,
- a voltage hold device connection terminal connected to one of a node and two terminals of the plurality of voltage hold devices,
- a plurality of first switch circuits between the plurality of electric accumulator connection terminals and the voltage hold device connection terminal,
- a receiving terminal for receiving the synchronization signal,
- a transmitting terminal for transmitting the synchronization signal,
- a control circuit for controlling ON/OFF of the plurality of first switch circuits based on the synchronization signal, and
- an overcurrent detection circuit for detecting an overcurrent flowing through each of the plurality of first switch circuits.
A battery system, comprising:
- a plurality of electric accumulators connected in series;
- a plurality of voltage hold devices connected in series;
- a clock generation circuit for outputting a synchronization signal;
- and
- a plurality of the cell balance devices,
- wherein the plurality of the cell balance devices each comprise:
- a plurality of electric accumulator connection terminals each connected to one of a node and two terminals of the plurality of electric accumulators,
- and a voltage hold device connection terminal connected to one of a node and two terminals of the plurality of voltage hold devices,
- a plurality of first switch circuits between the plurality of electric accumulator connection terminals and the voltage hold device connection terminal,
- a receiving terminal for receiving the synchronization signal,
- a transmitting terminal for transmitting the synchronization signal,
- a control circuit for controlling ON/OFF of the plurality of first switch circuits based on the synchronization signal, and
- an overcurrent detection circuit for detecting an overcurrent flowing through each of the plurality of first switch circuits,
- wherein the overcurrent detection circuit comprises:
- a second switch circuit which is controlled so as to be turned ON/OFF simultaneously with the each of the plurality of first switch circuits;
- a constant current circuit for allowing a constant current to flow through the second switch circuit;
- and
- a comparator circuit for comparing a voltage based on an ON-state resistance of the each of the plurality of first switch circuits and a current flowing through the each of the plurality of first switch circuits and a voltage based on an ON-state resistance of the second switch circuit and the constant current.
Dependencies are inferred from the claim text.