A battery monitoring system for electric power tool includes a battery pack for electric power tool and an auxiliary power source. The battery pack has a battery and a monitoring circuit. The battery is provided with at least one battery cell. The monitoring circuit is operated by electric power sup
A battery monitoring system for electric power tool includes a battery pack for electric power tool and an auxiliary power source. The battery pack has a battery and a monitoring circuit. The battery is provided with at least one battery cell. The monitoring circuit is operated by electric power supplied from the battery, and monitors a status of the battery. The auxiliary power source outputs electric power allowing the monitoring circuit to operate. The monitoring circuit is configured such that, when the monitoring circuit is unoperational with the electric power of the battery due to a decrease in a voltage of the battery, the monitoring circuit becomes operational by the electric power supplied from the auxiliary power source.
대표청구항▼
1. A battery monitoring system for electric power tool comprising a battery pack for electric power tool, a battery charger for the electric power tool, and an auxiliary power source, wherein the battery pack includes: a battery that is used as a driving power source for electric power tool and has
1. A battery monitoring system for electric power tool comprising a battery pack for electric power tool, a battery charger for the electric power tool, and an auxiliary power source, wherein the battery pack includes: a battery that is used as a driving power source for electric power tool and has at least one battery cell; anda monitoring circuit that is operated by electric power supplied from the battery and monitors a status of the battery,the battery charger is configured such that the battery charger is detachably attached to the battery pack, and the battery charger generates and outputs charging power for charging the battery, andthe auxiliary power source is provided inside or separately from the battery pack and outputs electric power allowing the monitoring circuit to operate, wherein the monitoring circuit is configured to be operational by the electric power supplied from the auxiliary power source when the monitoring circuit becomes unoperational with the electric power of the battery due to a decrease in a voltage of the battery, and includes: a chargeability determination unit that determines whether or not the battery is in a chargeable state by monitoring the battery; anda signal output unit that outputs, as one of the monitored items, a charge permission signal to the battery charger when the battery is determined to be in a chargeable state by the chargeability determination unit, the charge permission signal indicating that the battery is in a chargeable state,wherein the battery charger outputs the charging power to the battery pack when the charge permission signal is inputted to the battery charger from the battery pack. 2. The battery monitoring system according to claim 1, wherein the at least one battery cell included in the battery is a rechargeable battery cell, andwherein the auxiliary power source is provided inside the battery charger and the auxiliary power source is configured to be capable of supplying the electric power of the auxiliary power source to the battery pack when the battery pack is attached to the battery charger. 3. The battery monitoring system according to claim 1, wherein the battery charger includes a charger-side terminal that outputs the electric power of the auxiliary power source to the battery pack, andwherein the battery pack includes a battery pack-side terminal which is connected to the charger-side terminal when the battery pack is attached to the battery charger, and the electric power of the auxiliary power source outputted from the charger-side terminal is inputted to the battery pack through the battery pack-side terminal. 4. The battery monitoring system according to claim 1, wherein the battery pack includes an output terminal that outputs monitored items by the monitoring circuit to the battery charger, andwherein the battery charger includes an input terminal which is connected to the output terminal when the battery pack is attached to the battery charger, and the monitored items outputted from the output terminal is inputted to the battery charger through the input terminal. 5. The battery monitoring system according to claim 4, wherein the signal output unit outputs the charge permission signal to the output terminal, andwherein the battery charger outputs the charging power to the battery pack when the charge permission signal is inputted to the battery charger from the battery pack via the input terminal. 6. The battery monitoring system according to claim 1, wherein the battery pack further includes a connection detecting unit which detects that the battery pack is attached to the battery charger based on an input of the electric power of the auxiliary power source, when the electric power of the auxiliary power source is inputted to the battery pack as a result of the battery pack being attached to the battery charger. 7. The battery monitoring system according to claim 1, wherein the battery pack further includes a power supply circuit to which the voltage of the battery and the voltage of the auxiliary power source are inputted, and the power supply circuit generates an operating power source for operating the monitoring circuit based on one of the voltage of the battery and the voltage of the auxiliary power source, andwherein the monitoring circuit is configured to be operational with the operating power source generated by the power supply circuit. 8. The battery monitoring system according to claim 7, wherein the power supply circuit generates the operating power source based on a greater one of the voltage of the battery and the voltage of the auxiliary power source. 9. The battery monitoring system according to claim 8, wherein the power supply circuit comprises: a generating circuit to which one of the voltage of the battery and the voltage of the auxiliary power source is inputted, and the generating circuit generating the operating power source based on the voltage inputted;a first diode having a cathode connected to an input side of the generating circuit, and an anode to which the voltage of the battery is inputted, anda second diode having a cathode connected to the input side of the generating circuit, and an anode to which the voltage of the auxiliary power source is inputted. 10. The battery monitoring system according to claim 7, wherein the battery pack further includes an output stopping unit which is provided on a current-carrying path extending from where the voltage of the auxiliary power source is inputted to the battery pack to where the voltage of the auxiliary power source reaches the power supply circuit, and the output stopping unit inhibits the voltage of the battery to be inputted to the power supply circuit from being outputted to an auxiliary power source side via the current-carrying path. 11. The battery monitoring system according to claim 10, wherein the output stopping unit is a third diode having: a cathode connected to the power supply circuit; andan anode to which the voltage of the auxiliary power source is inputted. 12. The battery monitoring system according to claim 10, wherein the output stopping unit is a fuse. 13. A battery pack for electric power tool comprising: a battery having at least one battery cell; anda monitoring circuit that is operated by electric power supplied from the battery, and monitors a status of the battery; wherein the monitoring circuit is configured to be operational by electric power supplied from an auxiliary power source different from the battery when the monitoring circuit is unoperational with electric power of the battery due to a decrease in a voltage of the battery, and includes: a chargeability determination unit that determines whether or not the battery is in a chargeable state by monitoring the battery; anda signal output unit that outputs, as one of the monitored items, a charge permission signal to a battery charger for the electric power tool when the battery is determined to be in a chargeable state by the chargeability determination unit, the charge permission signal indicating that the battery is in a chargeable state, andwherein the battery pack is configured to be supplied with charging power from the battery charger when the charge permission signal is inputted into the battery charger. 14. A battery charger for electric power tool configured such that the battery charger is detachably attached to a battery pack for electric power tool, the battery pack including: a battery having at least one battery cell; anda monitoring circuit being operated by electric power supplied from the battery and monitoring a status of the battery, the monitoring circuit including: a chargeability determination unit that determines whether or not the battery is in a chargeable state by monitoring the battery; anda signal output unit that outputs, as one of the monitored items, a charge permission signal to the battery charger when the battery is determined to be in a chargeable state by the chargeability determination unit, the charge permission signal indicating that the battery is in a chargeable state,wherein the battery charger generates and outputs charging power for charging the battery,wherein the battery charger further includes an auxiliary power source that outputs electric power allowing the monitoring circuit to operate, andwherein the battery charger is configured to be capable of supplying the electric power of the auxiliary power tool to the battery pack when the battery pack is attached to the battery charger, and is configured to output the charging power to the battery pack when the charge permission signal is inputted from the battery pack.
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