Patent ID: 8963551
Filing Date: 2015-02-24
Classification: B60L,G01R,H01M,H02J,Y02E,Y02T

Abstract:
1. An abnormality detecting system for a battery assembly having a plurality of battery cells connected in series, comprising: a plurality of detection units provided for the plurality of battery cells, respectively, each of the detection units being arranged to compare an output voltage of a corresponding one of the battery cells with a predetermined criteria voltage, the plurality of detection units operating sequentially in response to a start trigger, and sequentially transmitting a detection signal that reflects a result of the voltage comparison, so as to output an abnormality signal indicative of whether the output voltage of any of the plurality of battery cells becomes lower than the criteria voltage; a current detector that detects a current that passes through the plurality of battery cells; and an abnormality monitoring circuit that checks if an internal resistance abnormality as an increase of the internal resistance to a level larger than an upper limit thereof occurs in any of the plurality of battery cells, based on the detection signal received from the plurality of detection units and a current detection value obtained by the current detector, wherein the abnormality monitoring circuit comprises: wherein the current sampling unit sets the sampling cycle such that a first current sampling time is set at a point in time at which a given length of time that is equal to or less than a half of the sampling cycle period elapses from the beginning of voltage comparisons for the plurality of battery cells in the plurality of detection units, and such that a final current sampling time is set at a point in time that precedes the end of voltage comparisons in the plurality of detection units, by a given length of time that is equal to or less than the half of the sampling cycle period.