| 摘要 |
<p>Provided is an electric construction machine capable of increasing the charging rate of its battery device in spite of a short charging time. The electric construction machine comprises a battery device 7 which includes a plurality of battery systems 56A and 56B and an inverter device 32 which has a motor driving control function of selectively connecting one of the battery systems 56A and 56B, converting DC power supplied from the connected battery system into AC power, and supplying the AC power to an electric motor 31. The inverter device 32 has a battery charging control function of selectively connecting one of the battery systems 56A and 56B and supplying electric power from an external commercial power supply 48 to the connected battery system. When the voltages of the battery systems 56A and 56B are less than an upper limit value V 1 at the start of the charging, constant-current charging of the battery system 56A is started. Thereafter, before the battery system 56A reaches the fully charged state, the connection is switched to the battery system 56B and constant-current charging of the battery system 56B is started.</p> |
