Multi-series connection type battery cell pack for reducing self-consumption over a long period of time
First Claim
1. A multi-series connection type battery cell pack, characterized by comprising a plurality of series-connected battery cells, a charge/discharge control switch connected between said plurality of battery cells and an output terminal to perform charge/discharge control, a plurality of protective circuits for dividing said plurality of battery cells into a plurality of blocks to detect at least the voltage of each battery cell, a computing circuit for computation of pack detection signals including detection signals of said plurality of protective circuits and a level conversion circuit for unifying voltages references of said detection signals between said plurality of protective circuits and said computing circuit, wherein said plurality of protective circuits are joined in parallel with said battery cells in a multistage fashion.
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Abstract
The invention provides a multi-series connection type battery cell pack, characterized by comprising a plurality of series-connected battery cells 1, a charge/discharge control switch 2 for performing charge/discharge control, a plurality of protective circuits 3-1 and 3-2 for dividing the plurality of battery cells 1 into a plurality of blocks to detect at least the voltage of each battery cell, a computing circuit 5 for performing computation of pack detection signals and a level conversion circuit 4 for unifying voltages references of the detection signals between the plurality of protective circuits 3-1 and 3-2 and the computing circuit 5, wherein the plurality of protective circuits 3-1 and 3-2 are joined in parallel with the battery cells 1 in a multistage fashion. It is thus possible to unify the voltage references while computation and communication are executed irrespective of control. It is then possible to manage the battery cell pack in a unified manner using a microcomputer or the like and, hence, to determine management specific to batteries and operational criteria specific to battery products at users'"'"' disposal. It is also possible to make a switching between a mode wherein current consumption in the pack minimizes and a normal operation mode and, hence, switch the pack over to the minimum current consumption mode when it is not in use, thereby reducing the failure rate during long-term storage.
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Citations
9 Claims
- 1. A multi-series connection type battery cell pack, characterized by comprising a plurality of series-connected battery cells, a charge/discharge control switch connected between said plurality of battery cells and an output terminal to perform charge/discharge control, a plurality of protective circuits for dividing said plurality of battery cells into a plurality of blocks to detect at least the voltage of each battery cell, a computing circuit for computation of pack detection signals including detection signals of said plurality of protective circuits and a level conversion circuit for unifying voltages references of said detection signals between said plurality of protective circuits and said computing circuit, wherein said plurality of protective circuits are joined in parallel with said battery cells in a multistage fashion.
- 5. A multi-series connection type battery cell pack, characterized by comprising a plurality of series-connected battery cells, a charge/discharge control switch connected between said plurality of battery cells and an output terminal to perform charge/discharge control, a protective circuit for detecting at least the voltage of each of said plurality of battery cells and a control circuit for communicating with external equipment to manage and control signals in said pack, inclusive of detection signals, wherein said control circuit has a switching function of making a switching between a mode wherein current consumption in said pack minimizes and a normal operation mode.
- 8. A charger that makes use of a battery cell pack function, characterized by comprising therein a plurality of series-connected battery cells, a detection circuit for detecting at least the voltages and charging currents of said plurality of battery cells and a control circuit having a communication function capable of communicating with external equipment and for managing and controlling detection signals, which comprises a charging unit for charging said battery cell pack from a charging power source and a charge control means for communicating with said control circuit in said battery cell pack to acquire and compute said detection signals thereby controlling said charging unit.
Specification