Patent ID: 8421415

Claim:
A working machine having a battery protecting function, comprising: a hydraulic actuator; an engine; a hydraulic pump which is connected to the engine and driven by an output power of the engine to supply hydraulic fluid to the hydraulic actuator; a battery; a generator motor which is connected to the engine to serve as a generator by the output power of the engine to charge the battery and serve as a motor for assisting the engine by supply of an electric power from the battery; a battery monitor which detects a battery SOC indicating a charging state of the battery; a controller which controls a charging power of the battery depending on the battery SOC detected by the battery monitor; and a working state detector which detects a working state as information for discriminating between a working period during which the hydraulic actuator is actuated and a standby period during which the hydraulic actuator is not actuated, wherein the controller limits the charging power in the standby period in comparison with in the working period.