Importance

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Abstract

The battery condition such as the voltage of individual batteries for constructing a battery set is intended to be measured by using a simple system. Further, it is also intended to save the electric power consumption. For this purpose, a battery condition-detecting unit is arranged closely with respect to each of the individual batteries for constructing the battery set. Information is transmitted by using an optical signal between the respective battery condition-detecting units and a single transmitting/receiving unit connected to a managing ECU. The battery condition-detecting unit is started up (woken up) on the basis of a request for the detection of the battery condition made by the managing ECU, and it detects the battery condition of the corresponding individual battery. When the detected battery condition is sent to the managing ECU by means of the serial communication with the optical signal, the battery condition-detecting unit is allowed to be in a start-up-waiting state (sleep state).

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First Claim