Device and method for detecting deteriorated battery cell

An apparatus for detecting a deteriorated battery cell, the apparatus comprising:

• a measurement unit that measures a state of a battery;
• an estimation unit that estimates a state of health (SOH) of the battery;
• a diagnosis setting unit that sets a diagnosis start condition, a diagnosis section, and a deterioration determination condition of the deteriorated battery cell according to the SOH of the battery;
• a diagnosis performance decision unit that decides whether or not to perform a diagnosis by determining whether or not the diagnosis start condition of the deteriorated battery cell is satisfied after an end of charging and discharging of the battery;
• and
• a deterioration determination unit that determines the deteriorated battery cell by calculating a voltage difference in the diagnosis section after the end of the charging and discharging and comparing the voltage difference with the deterioration determination condition,
• wherein the diagnosis setting unit comprises:
• a diagnosis start condition setting unit that sets the diagnosis start condition of the deteriorated battery cell according to the SOH of the battery,
• a diagnosis section setting unit that sets the diagnosis section of the deteriorated battery cell, and
• a deterioration condition setting unit that sets the deterioration determination condition of the deteriorated battery cell according to the SOH of the battery,
• wherein the diagnosis section setting unit sets the diagnosis section by:
• setting a charging end time point and a discharging end time point when a current measurement value is less than or equal to a predetermined current limit time,
• setting a time for a predetermined set value from the charging end time point as a charging detection section reference value, and
• setting the time for the predetermined set value from the discharging end time point as a discharging detection section reference value,
• wherein the diagnosis start condition setting unit sets a first and second start conditions of charging and discharging sections according to the SOH of the battery,
• wherein the first start condition of the charging section is charging for a charging operation time or more, the second start condition thereof is charging for a charging depth of discharge (DOD) or more, and
• wherein the first start condition of the discharging section is discharging for a discharging operation time or more, and the second start condition is discharging for a discharging depth of discharge (DOD) or more.