APPARATUS AND METHOD FOR DETECTING FAULTS OF BATTERY HEATING SYSTEM AND RELAYS

摘要

Disclosed is a method and system for detecting faults of a battery heating system and relays. In particular, a method for detecting welding of each relay such as a main relay, a precharge relay or a heater relay and a method for detecting a fault of a battery heating system such as a short circuit, disconnection or damage of each heater are provided by sensing a voltage. In the methods, the on/off state of the heater relay and the high voltage relays is controlled through a predetermined process to detect a fault of the heater relay or the high voltage relay, and welding of the heater relay or the high voltage relay is then detected from a voltage for fault detection which is sensed through a voltage sensing circuit unit for fault detection.

主权项

1. An apparatus for detecting faults of a heater relay and high voltage relays in a battery heating system which includes a heater installed in each battery module of a battery pack to heat the battery module, the heater relay configured to selectively apply power to the heaters connected in series, and the high voltage relays of (+) and (−) power lines connected to the battery pack, the apparatus comprising:
a voltage sensing circuit unit configured to detect a fault and configured to sense a voltage for fault detection when the faults of the heater relay and the high voltage relays are detected; and a battery management system (BMS) configured to operate the on/off of the heater relay and the high voltage relays and detect welding of the heater relay and the high voltage relays from the voltage for fault detection.