ABNORMALITY DETECTION METHOD AND ABNORMALITY DETECTION DEVICE

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ABNORMALITY DETECTION METHOD AND ABNORMALITY DETECTION DEVICE

This abstract first appeared for US patent application 20250130289 titled 'ABNORMALITY DETECTION METHOD AND ABNORMALITY DETECTION DEVICE

Original Abstract Submitted

an abnormality detection method of a sub battery (lfp type battery) for backing up a main battery that includes the steps of charging the sub battery to a fully charged state, discharging a predetermined current amount from the fully charged sub battery, maintaining the sub battery in a state where the current becomes equal to or less than a predetermined value until a predetermined time elapses, discharging a detection current for detecting an abnormality of the sub battery from the sub battery after a predetermined time elapses, calculating a voltage drop amount, which is a difference between the cell voltage at the start of discharge of the detection current and the cell voltage at the end of discharge, for a plurality of battery cells constituting the sub battery, respectively, and determining that the sub battery is abnormal.