Battery monitoring apparatus

1. A battery monitoring apparatus for monitoring a plurality of unit batteries of an assembled battery installed in a vehicle, the unit batteries of the assembled battery being grouped into a plurality of battery blocks,

the battery monitoring apparatus comprising:

a battery ECU;

a plurality of voltage monitors each of which is adapted to be mounted to a corresponding one of the battery blocks; and

a monitor activation device,

wherein

the battery ECU is configured to wirelessly transmit commands to the voltage monitors,

the voltage monitors are configured to detect voltage information of the unit batteries and wirelessly transmit the detected voltage information to the battery ECU, and

the monitor activation device is configured to sequentially activate the voltage monitors with time lags therebetween in a predetermined order recognized by the battery ECU,

wherein

the battery monitoring apparatus is configured so that:

the voltage monitors sequentially start wireless communication with the battery ECU in the predetermined order in which the voltage monitors are sequentially activated by the monitor activation device; and

the battery ECU assigns IDs, via the wireless communication, sequentially to the voltage monitors in the predetermined order.

2. The battery monitoring apparatus as set forth in claim 1 , wherein all the battery blocks are connected in series with each other, and

the predetermined order, in which the voltage monitors are sequentially activated by the monitor activation device, is an order in which electric potentials of the battery blocks respectively corresponding to the voltage monitors decrease or an order in which the electric potentials of the battery blocks respectively corresponding to the voltage monitors increase.

3. The battery monitoring apparatus as set forth in claim 1 , wherein the voltage monitors are further configured to be sequentially activated in the predetermined order in response to electric power sequentially supplied to the voltage monitors in the predetermined order or signals sequentially transmitted to the voltage monitors in the predetermined order.

4. The battery monitoring apparatus as set forth in claim 3 , wherein the monitor activation device comprises the battery ECU, and

each of the voltage monitors is connected with the battery ECU via predetermined wiring.

5. The battery monitoring apparatus as set forth in claim 1 , wherein the monitor activation device comprises the battery ECU,

each of the voltage monitors is connected with the battery ECU via a corresponding one of a plurality of electric power lines,

each of the voltage monitors is configured to be supplied with electric power from the battery ECU via the corresponding electric power line and thereby activated, and

the battery ECU is configured to sequentially start the supply of electric power to the voltage monitors in the predetermined order and thereby sequentially activate the voltage monitors in the predetermined order.

6. The battery monitoring apparatus as set forth in claim 1 , wherein the monitor activation device comprises the battery ECU,

each of the voltage monitors is configured to be activated, upon receipt of a predetermined activation signal, using electric power supplied from an electric power source other than the battery ECU,

each of the voltage monitors is connected with the battery ECU via a corresponding one of a plurality of signal lines that transmit the activation signal, but neither the commands nor the voltage information, and

the battery ECU is configured to send the activation signal, via the corresponding signal lines, sequentially to the voltage monitors in the predetermined order and thereby sequentially activate the voltage monitors in the predetermined order.

7. The battery monitoring apparatus as set forth in claim 6 , wherein for each of the voltage monitors, the electric power source other than the battery ECU is the unit batteries of the battery block corresponding to the voltage monitor.

8. The battery monitoring apparatus as set forth in claim 1 , wherein the monitor activation device comprises the battery ECU and the voltage monitors,

each of the voltage monitors is configured to be activated, upon receipt of a predetermined activation signal, using electric power supplied from an electric power source other than the battery ECU,

the battery ECU is connected with a predetermined one of the voltage monitors via a signal line that transmits the activation signal, but neither the commands nor the voltage information,

all the voltage monitors are connected, via a plurality of connection lines that transmit the activation signal, in series with each other in the predetermined order from the predetermined voltage monitor, and

the battery monitoring apparatus is configured so that:

the battery ECU sends the activation signal to the predetermined voltage monitor via the signal line and thereby activates the predetermined voltage monitor; and then

the remaining voltage monitors are sequentially activated in the predetermined order through successive transmission of the activation signal from each activated one of the voltage monitors to another of the voltage monitors which is connected with the activated voltage monitor via a corresponding one of the connection lines and has not been activated yet.

9. The battery monitoring apparatus as set forth in claim 8 , wherein for each of the voltage monitors, the electric power source other than the battery ECU is the unit batteries of the battery block corresponding to the voltage monitor.

10. A battery monitoring apparatus for monitoring a plurality of unit batteries of an assembled battery installed in a vehicle, the unit batteries of the assembled battery being grouped into a plurality of battery blocks,

the battery monitoring apparatus comprising:

a battery ECU;

a plurality of voltage monitors each of which is adapted to be mounted to a corresponding one of the battery blocks; and

a monitor activation device,

wherein

the battery ECU is configured to wirelessly transmit commands to the voltage monitors,

the voltage monitors are configured to detect voltage information of the unit batteries and wirelessly transmit the detected voltage information to the battery ECU, and

the monitor activation device is configured to sequentially activate the voltage monitors with time lags therebetween in a predetermined order recognized by the battery ECU,

wherein

the voltage monitors are further configured to be sequentially activated in the predetermined order in response to electric power sequentially supplied to the voltage monitors in the predetermined order or signals sequentially transmitted to the voltage monitors in the predetermined order.

11. The battery monitoring apparatus as set forth in claim 10 , wherein the monitor activation device comprises the battery ECU, and

each of the voltage monitors is connected with the battery ECU via predetermined wiring.

12. The battery monitoring apparatus as set forth in claim 11 , wherein the predetermined wiring comprises a plurality of electric power lines,

each of the voltage monitors is connected with the battery ECU via a corresponding one of the electric power lines,

each of the voltage monitors is configured to be supplied with electric power from the battery ECU via the corresponding electric power line and thereby activated, and

the battery ECU is configured to sequentially start the supply of electric power to the voltage monitors in the predetermined order and thereby sequentially activate the voltage monitors in the predetermined order.

13. The battery monitoring apparatus as set forth in claim 11 , wherein each of the voltage monitors is configured to be activated, upon receipt of a predetermined activation signal, using electric power supplied from an electric power source other than the battery ECU,

the predetermined wiring comprises a plurality of signal lines that transmit the activation signal, but neither the commands nor the voltage information,

each of the voltage monitors is connected with the battery ECU via a corresponding one of the signal lines, and

the battery ECU is configured to send the activation signal, via the corresponding signal lines, sequentially to the voltage monitors in the predetermined order and thereby sequentially activate the voltage monitors in the predetermined order.

14. The battery monitoring apparatus as set forth in claim 13 , wherein for each of the voltage monitors, the electric power source other than the battery ECU is the unit batteries of the battery block corresponding to the voltage monitor.

15. The battery monitoring apparatus as set forth in claim 11 , wherein the monitor activation device further comprises the voltage monitors,

each of the voltage monitors is configured to be activated, upon receipt of a predetermined activation signal, using electric power supplied from an electric power source other than the battery ECU,

the predetermined wiring comprises a signal line that transmits the activation signal, but neither the commands nor the voltage information, and a plurality of connection lines that transmit the activation signal,

the battery ECU is connected with a predetermined one of the voltage monitors via the signal line,

all the voltage monitors are connected, via the connection lines, in series with each other in the predetermined order from the predetermined voltage monitor, and

the battery monitoring apparatus is configured so that:

the battery ECU sends the activation signal to the predetermined voltage monitor via the signal line and thereby activates the predetermined voltage monitor; and then

the remaining voltage monitors are sequentially activated in the predetermined order through successive transmission of the activation signal from each activated one of the voltage monitors to another of the voltage monitors which is connected with the activated voltage monitor via a corresponding one of the connection lines and has not been activated yet.

16. The battery monitoring apparatus as set forth in claim 15 , wherein for each of the voltage monitors, the electric power source other than the battery ECU is the unit batteries of the battery block corresponding to the voltage monitor.