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.
BATTERY MANAGEMENT SYSTEM FOR AN ELECTRIC VEHICLE WITH LEAKAGE RESISTANCE DETECTION
BATTERIEVERWALTUNGSSYSTEM FÜR EIN ELEKTROFAHRZEUG MIT LECKWIDERSTANDSBESTIMMUNG
SYSTÈME DE GESTION DE BATTERIE D'UN VÉHICULE ÉLECTRIQUE AVEC DÉTERMINATION DE RÉSISTANCE DE FUITE
2021-03-31
Patent
Electronic Resource
English
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