A battery diagnosis apparatus includes a battery monitor to detect a voltage of each of a plurality of battery cells included in a battery module; and a control circuit to determine a latest value of a first voltage deviation indicating a difference between a voltage behavior of each battery cell and an average voltage behavior of the plurality of battery cells over a relaxation period from a start time of a resting event. For each battery cell, the control circuit determines a latest value of a second voltage deviation by applying a smoothing algorithm to the latest value of the first voltage deviation, determines a latest value of a third voltage deviation indicating a difference between the latest value of the first voltage deviation and the latest value of the second voltage deviation, determines a latest value of a fourth voltage deviation indicating a difference between the latest value of the third voltage deviation and a previous value of the third voltage deviation, determines a latest value of a threshold deviation using a distribution of a time series of the fourth voltage deviation having a predetermined size, and determines whether the corresponding battery cell has a micro short circuit by comparing the latest value of the third voltage deviation with the latest value of the threshold deviation..
BATTERY DIAGNOSIS APPARATUS, BATTERY PACK, ELECTRIC VEHICLE, AND BATTERY DIAGNOSIS METHOD
BATTERIEDIAGNOSEVORRICHTUNG, BATTERIEPACK, ELEKTROFAHRZEUG UND BATTERIEDIAGNOSEVERFAHREN
APPAREIL DE DIAGNOSTIC DE BATTERIE, BLOC-BATTERIE, VÉHICULE ÉLECTRIQUE ET PROCÉDÉ DE DIAGNOSTIC DE BATTERIE
2023-12-20
Patent
Electronic Resource
English
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