To provide a residual capacity calculation method that can calculate the residual capacity with little deviation from the actual residual capacity when the packed battery is returned from shutdown after being shut down and then stored, a pre-shipment adjustment method of packed battery, a residual capacity calculation device, and a packed battery.
By setting a MOSFET 61 connected between a power supply IC 6 and a 3.3 V power supply terminal to an OFF state, a control circuit board 100 containing a control part 5 for calculating RSOC (Relative State Of Capacity) is shut down. When the circuit board 100 returns from the shutdown state, RSOC is calculated by determining the maximum cell voltage as OCV (Open Circuit Voltage), determining a quadratic curve approximating a discharge characteristic by checking against a certain discharge characteristic associating the level of OCV with the volume of RSOC, and then plugging the determined maximum cell voltage into a quadratic function representing the determined quadratic curve.
KAINO TOMOMI
KAWAKADO ATSUSHI
YAMAMOTO RYOSUKE
KOBAYASHI MASAYUKI
