A determination method of smoke emission in a battery includes: calculating first and second internal resistance values, of each of the parallel circuits in first and subsequent second periods, respectively; acquiring a temperature value of each of parallel circuits; and determining the smoke emission in at least one of cells included in one of the parallel circuits, when at least detecting that the one of the parallel circuits has the second internal resistance value smaller than the first internal resistance value, and has an increase in the temperature value within a period defined based on the first and second periods.