ELECTRIC CONSTRUCTION MACHINE
First Claim
1. An electric construction machine comprising:
- an electric motor;
a hydraulic pump that is driven by the electric motor;
a plurality of hydraulic actuators that are driven by hydraulic fluid discharged from the hydraulic pump; and
a battery device that serves as an electrical power source for the electric motor;
wherein the battery device includes a plurality of battery systems that each have a plurality of series-connected batteries and are mutually parallel-connected,wherein the electric construction machine includesconnection change control means that can change the connections of the battery systems to select one of the battery systems and let the selected battery system supply electrical power to the electric motor, anddisplay means for indicating a battery system that supplies electrical power to the electric motor.
1 Assignment
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Accused Products
Abstract
Provided is an electric construction machine capable of avoiding a situation where charging is difficult to achieve due to the exhaustion of a battery device. An electrically-operated hydraulic excavator includes an electric motor, a hydraulic pump that is driven by the electric motor, hydraulic actuators that are driven by hydraulic fluid discharged from the hydraulic pump, and a battery device that serves as an electrical power source for the electric motor. The battery device includes battery systems that each have a plurality of batteries. A selector switch makes it possible to select either one of the battery systems. An arithmetic control section of an inverter device controls connection change switches through battery controllers to change the connections of the battery systems so that electrical power is supplied to the electric motor from either the battery system or the battery system, whichever is selected by the selector switch.
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Citations
4 Claims
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1. An electric construction machine comprising:
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an electric motor; a hydraulic pump that is driven by the electric motor; a plurality of hydraulic actuators that are driven by hydraulic fluid discharged from the hydraulic pump; and a battery device that serves as an electrical power source for the electric motor; wherein the battery device includes a plurality of battery systems that each have a plurality of series-connected batteries and are mutually parallel-connected, wherein the electric construction machine includes connection change control means that can change the connections of the battery systems to select one of the battery systems and let the selected battery system supply electrical power to the electric motor, and display means for indicating a battery system that supplies electrical power to the electric motor. - View Dependent Claims (2, 3)
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4. (canceled)
Specification