Battery module
A battery module according to an embodiment includes a battery; a breaker that switches electrical connection of an output line from the battery to outside; a power source switch circuit that receives an internal source voltage supplied from the battery, an external source voltage supplied from an external power source, and an boot signal from outside, and switches a source of power that supplies source voltage from the external power source to the battery when at least one of the external source voltage and the boot signal is at a second level; and a control circuit that uses, as power supply, the source voltage that is output from the power source switch circuit, and controls operation of the breaker and of the power source switch circuit.
1. A battery module, comprising:
a battery;
a breaker that controls conduction and insulation operations by one-shot pulses and switches electrical connection of an output line from the battery to outside;
a power source switch circuit that receives an internal source voltage supplied from the battery, an external source voltage supplied from an external power source, and a boot signal from outside, and switches a source of power that supplies source voltage from the external power source to the battery when at least one of the external source voltage and the boot signal is at a second level lower than a first level; and
a control circuit that uses, as a power supply, the source voltage that is output from the power source switch circuit, and controls operation of the breaker and of the power source switch circuit,
wherein the control circuit turns OFF the breaker and stops the supply of the source voltage when a period during which the external source voltage or the boot signal is at the second level exceeds a predetermined threshold.
2. The battery module according to claim 1 , wherein the control circuit turns OFF the breaker and stops supplying the source voltage when the battery voltage becomes equal to or less than a discharge end voltage in a period in which the external source voltage or the boot signal is at the second level.
3. The battery module according to claim 1 , wherein the control circuit turns OFF the breaker and stops supplying the source voltage when, after a boot, the boot signal reaches the second level and a shutdown command is received.
4. The battery module according to claim 1 , wherein the power source switch circuit has a capacitor capable of holding, for a predetermined period of time, a voltage for switching the breaker.
5. The battery module according to claim 1 , wherein the control circuit controls the power source switch circuit and switches the source of power that supplies the source voltage from the battery to the external power source, when at least one of the external source voltage and the boot signal has reached the first level from the second level so that both of the external source voltage and the boot signal are at the first level.