BATTERY DIAGNOSIS APPARATUS, BATTERY DIAGNOSIS METHOD, BATTERY PACK, AND VEHICLE

Disclosed is a battery diagnosis apparatus, which includes a voltage sensing circuit configured to generate a voltage signal indicating a cell voltage of a battery cell; a storage medium configured to store time series data for the cell voltage; and a control circuit operably coupled with the voltage sensing circuit and the storage medium. The control circuit is configured to (i) receive the voltage signal and record the time series data for the cell voltage in the storage medium, (ii) select k, k+1, and k+2 measured cell voltage set from the time series data as diagnostic data (k is an index indicating a measurement order of the cell voltage and is a natural number of 1 or more to which a plurality of values is assigned), (iii) determine a first voltage difference between the k cell voltage and the k+1 cell voltage and a second voltage difference between the k+1 cell voltage and the k+2 cell voltage, and (iv) diagnose the battery cell as exhibiting a voltage abnormality, when, for a plurality of cell voltage sets, a count number of cell voltage sets for which a normal diagnosis condition where the p square of the first voltage difference (p is a natural number of 1 or more) is greater than the p square of the second voltage difference is not established is greater than or equal to a criterion value.