Patent ID: 9550431
Date: 2017-01-24
CPC Classifications: B60L,H02J,Y02T

Claim:
1. A working machine comprising: an electric motor configured to drive a drive target and generate electricity; a power storage device; a charge-discharge control circuit which is configured to control charging and discharging of the power storage device and is connected to the electric motor; and a controller configured to control the charge-discharge control circuit, wherein the controller obtains a calculation value of an internal resistance of the power storage device based on a measured value of an open circuit voltage of the power storage device, and a measured value of an inter-terminal voltage and a measured value of a charge-discharge current when the power storage device is charged and discharged, and obtains a correction value of the internal resistance by correcting the calculation value of the internal resistance based on the measured value of the open circuit voltage.