Apparatus for diagnosing abnormality of a battery cell group and method for the same

A method for diagnosing abnormality of a battery cell group, the method comprising:

• measuring, by a voltage sensor, a voltage value with respect to each battery cell group including a plurality of battery cells connected to each other in parallel;
• determining, by a controller, an accumulated voltage value for an effective time with respect to each battery cell group;
• determining, by the controller, a representative value for each battery cell group by removing an offset from each accumulated voltage value;
• and
• detecting, by the controller, a battery cell group having the abnormality, based on an average value and a standard deviation of representative values.

An apparatus for diagnosing abnormality of a battery cell group, the apparatus comprising:

• a voltage sensor configured for measuring a voltage value with respect to each battery cell group including a plurality of battery cells connected to each other in parallel;
• and
• a controller configured to:
• determine a corrected voltage for each battery cell group by removing an offset from the voltage value;
• determine a corrected-voltage accumulated value for an effective time with respect to each battery cell group, based on the corrected voltage;
• and
• detect a battery cell group having the abnormality, based on an average value and a standard deviation of the corrected-voltage accumulated value.

A method for diagnosing abnormality of a battery cell group, the method comprising:

• measuring, by a voltage sensor, a voltage value with respect to each battery cell group including a plurality of battery cells connected to each other in parallel;
• determining, by a controller, a corrected voltage for each battery cell group by removing an offset from the voltage value;
• determining, by the controller, a corrected-voltage accumulated value for an effective time with respect to each battery cell group, based on the corrected voltage;
• and
• detecting, by the controller, a battery cell group having the abnormality, based on an average value and a standard deviation of the corrected-voltage accumulated value.