Patent ID: 11874332
Assignee: DENSO TEN LIMITED
Field: Measurement (Instruments)
Classification: CPC G  B  Y | IPC G

Claim 0:
1. A failure detection apparatus comprising:
a first switch configured to be connected to a positive electrode of a battery;
a second switch configured to be connected to a negative electrode of the battery;
detection resistances that are connected in series between the first switch and the second switch;
a measurement circuit that measures a voltage of the detection resistances; and
a controller configured to:
(i) turn on both the first switch and the second switch to form a failure-detection series-connected circuit consisting of the battery and the detection resistances, and (ii) operate in a failure detection mode with the first and second switches turned on to detect a failure based on the voltage measured by the measurement circuit, wherein the failure detection mode includes the controller:
calculating a voltage of the battery based on the voltage measured by the measurement circuit for the failure-detection series-connected circuit,
detecting a failure by comparing the calculated voltage of the battery to a voltage of the battery received from an external apparatus that is external to the failure detection apparatus, and
determining that there is no failure when the calculated voltage of the battery is approximately equal to the voltage of the battery received from the external apparatus.