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

Claim 2:
3. 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:
detecting a failure based on the calculated voltage of the battery and 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 a voltage obtained by the controller dividing the voltage of the battery received from the external apparatus by a predetermined dividing ratio is approximately equal to the voltage measured by the measurement circuit for the failure-detection series-connected circuit.