Patent ID: 9383415
Filing Date: 2016-07-05
CPC Classification: G01R,H01M,Y02E

Claim Text:
1. A battery system comprising: at least one contactor; a battery including a plurality of battery cells and defining an input side, the battery being configured to be connected on the input side to a direct voltage intermediate circuit via the at least one contactor; a diagnostic device configured to diagnose a state of the at least one contactor; and a monitoring circuit including (i) a first branch in which the at least one contactor is located, and (ii) a second branch which is connected parallel thereto and in which a voltage source configured to generate a reference voltage is connected, the second branch further comprising: the diagnostic device being configured to measure a voltage drop across the shunt resistor and to determine the diagnostic current based on the measured voltage drop; the voltage source being configured as a potential-separated voltage source; the potential-separated voltage source being a winding of a flyback converter; and wherein the diagnostic device is configured to evaluate a diagnostic current which is dependent on the reference voltage and flows in the monitoring circuit and serves to determine a fault state of the at least one contactor based on a measured current value or a current profile of the diagnostic current.