Power supply control apparatus and battery unit

1. A power supply control apparatus for a power supply system, the power supply system including a first storage battery and a second storage battery that are connected in parallel to a power generator, and a switch on an electrical path that connects the first storage battery and the second storage battery, the switch being between the first storage battery and a connection point on the electrical path to which the power generator is connected, wherein the power supply control apparatus is configured to be started by input of a startup signal from outside the power supply control apparatus and control open and closed states of the switch, wherein the power supply control apparatus is configured to communicate with an other control apparatus via a communication line, the other control apparatus configured to be started by the startup signal, the power supply control apparatus comprising:

a processor configured to:

determine occurrence of a startup signal abnormality due to the startup signal not being received by the power supply control apparatus in a normal manner;

determine if the processor is in communication with the other control apparatus if the startup signal abnormality occurs; and

operate the switch to a closed state in response to a determination (1) of the occurrence of the startup signal abnormality and (2) communication between the processor and the other control apparatus.

2. The power supply control apparatus according to claim 1 , wherein:

the power supply control apparatus is applied to an in-vehicle power supply system that is mounted in a vehicle and in which communication via the communication line is performed in accompaniment with a power supply switch of the vehicle being turned on and the startup signal is supplied to the power supply control apparatus in accompaniment with the power supply switch being turned on; and

after the processor determines that the startup signal abnormality has occurred, the processor sets the switch to the closed state as a result of communication with the other control apparatus being performed and sets the switch to an open state as a result of communication with the other control apparatus not being performed.

3. The power supply control apparatus according to claim 2 , wherein:

the processor is configured to determine that input of the startup signal has returned to normal based on the startup signal being received by the power supply control apparatus in a state in which communication with the other control apparatus is not being performed after the startup signal abnormality is determined to have occurred.

4. The power supply control apparatus according to claim 3 , wherein:

the processor is configured to determine that input of the startup signal has returned to normal based on an amount of time within which input of the startup signal is continued being equal to or greater than a predetermined amount of time, in response to the startup signal being subsequently received by the power supply control apparatus after the startup signal abnormality is determined to have occurred.

5. The power supply control apparatus according to claim 4 , wherein:

the startup signal is provided as a plurality of startup signals respectively received by the power supply control apparatus from a plurality of routes; and

the processor is configured to determine that the startup signal abnormality has occurred in response to input of at least a portion of the startup signals being stopped.

6. The power supply control apparatus according to claim 5 , wherein:

the power supply control apparatus is applied to the power supply system that includes the switch as a first switch, and a second switch that is provided between the second storage battery and the connection point on the electrical path; and

the processor is configured to operate the first switch to the closed state and the second switch to the open state in response to the startup signal abnormality being determined to have occurred.

7. The power supply control apparatus according to claim 1 , wherein:

the power supply control apparatus is applied to an in-vehicle power supply system that is mounted in a vehicle and in which communication via the communication line is performed in accompaniment with a power supply switch of the vehicle being turned on and the startup signal is supplied to the power supply control apparatus in accompaniment with the power supply switch being turned on; and

the processor is configured to determine that input of the startup signal has returned to normal based on the startup signal being received by the power supply control apparatus in a state in which communication with the other control apparatus is not being performed after the startup signal abnormality is determined to have occurred.

8. The power supply control apparatus according to claim 1 , wherein:

the processor is configured to determine that input of the startup signal has returned to normal based on an amount of time within which input of the startup signal is continued being equal to or greater than a predetermined amount of time, in response to the startup signal being subsequently received by the power supply control apparatus after the startup signal abnormality is determined to have occurred.

9. The power supply control apparatus according to claim 1 , wherein:

the startup signal is provided as a plurality of startup signals respectively received by the power supply control apparatus from a plurality of routes; and

the processor is configured to determine that the startup signal abnormality has occurred in response to input of at least a portion of the startup signals being stopped.

10. The power supply control apparatus according to claim 1 , wherein:

the power supply control apparatus is applied to the power supply system that includes the switch as a first switch, and a second switch that is provided between the second storage battery and the connection point on the electrical path; and

the processor is configured to operate the first switch to the closed state and the second switch to the open state in response to the startup signal abnormality being determined to have occurred.

11. A battery unit comprising:

a power supply control apparatus that is applied to a power supply system, the power supply system including: a first storage battery and a second storage battery that are connected in parallel to a power generator; and a switch on an electrical path that connects the first storage battery and the second storage battery, the switch being between the first storage battery and a connection point on the electrical path to which the power generator is connected, wherein the power supply control apparatus is started by input of a startup signal from outside the power supply control apparatus and controls open and closed states of the switch, wherein the power supply control apparatus is configured to communicate with an other control apparatus via a communication line, the other control apparatus configured to be started by the startup signal, the power supply control apparatus comprising

a processor configured to:

determine whether a startup signal abnormality due to the startup signal not being received by the power supply control apparatus in a normal manner has occurred;

determine if the processor is in communication with the other control apparatus; and

operate the switch to a closed state in response to the startup signal abnormality being determined to have occurred and a determination that the processor is in communication with the other control apparatus;

a first terminal that is connected to the first storage battery;

a second terminal that is connected to the power generator;

a signal input terminal to which the startup signal is received; and

a connection path that connects the first terminal and the second terminal, wherein

the switch is provided on the connection path, and

the second storage battery is provided in the battery unit.