Patent ID: 9184602
Filing Date: 2015-11-10
Classification: H02J

Abstract:
1. A cell balancing circuit, comprising: a plurality of battery cells coupled in series; balancing switches, each balancing switch being coupled in parallel to a respective battery cell; balancing resistors, each balancing resistor being coupled in series to the respective battery cell; a balancing controller that individually controls the balancing switches such that the battery cells are discharged through the balancing resistors; and positive temperature coefficient (PTC) elements, each PTC element being positioned adjacent to a respective balancing resistor such that each PTC element senses a temperature of the respective balancing resistor, and each PTC element being electrically coupled to the respective balancing switch coupled in series to a respective balancing resistor such that each PTC element controls the respective balancing switch based on the sensed temperature of the respective balancing resistor.