BATTERY MANAGEMENT SYSTEM FOR AN ELECTRIC VEHICLE WITH LEAKAGE RESISTANCE DETECTION

The present invention relates to a battery management system for an electric vehicle. The battery management system comprises a first terminal (105) for electrically connecting one terminal (505) of a battery (500) of the electric vehicle,a second terminal (110) for electrically connecting an electric load of the electric vehicle, and a third terminal (115) for electrically connecting a chassis (600) of the electric vehicle. Further the battery management system comprises a first determination circuit (130, 230) conductively coupled with a first node (120) between the first terminal (105) and the second terminal (110) and conductively coupled with a second node (125) to the third terminal (115), the first determination circuit (130, 230) comprising: a first voltage divider which comprises a first series circuit with at least a first resistor (135) and a second resistor (140), a first switch (145) which is conductively coupled to the first resistor (135), so that, when the first switch is ON, the first resistor (135) is short-circuited and that, when the first switch (145) is OFF, the first resistor (135) is not short-circuited, and a first measurement circuit (150) configured to measure a first voltage across the second resistor (140), when the first switch (145) is OFF, and to measure a second voltage across the second resistor (140), when the first switch (145) is ON. Further the battery management system comprises a processing circuit configured to determine a leakage path resistance between an other terminal (510) of the battery (500) and the chassis (600) of the electric vehicle based on the first voltage and the second voltage.