Hybrid construction machine

Abstract

The objective of the present invention is to provide a hybrid construction machine wherein a power storage device can quickly be warmed up and the service life of the power storage device can be improved. This hybrid construction machine is equipped with: an engine (1); an electric motor that supplements the power of the engine (1) and generates power; a power storage device (8) that transmits power to and receives power from the electric motor; a warmup circuit (25) that circulates a heating medium heated by waste heat from the engine (1) or the electric motor, or by a heater (40), in the vicinity of the power storage device (8); a control device that controls the charging / discharging of the power storage device (8) and the circulation of the heating medium by the warmup circuit (25); and an outside air temperature measurement device that measures the outside air temperature. The control device performs a warmup operation by means of the heating medium, determines whether to perform charging / discharging of the power storage device (8) for the purpose of a warmup operation, in response to the outside air temperature as measured by the outside air temperature measurement device, and executes a warmup operation wherein the warmup operation based on charging / discharging of the power storage device (8) is performed at the same time.

Description

technical field [0001] The present invention relates to a hybrid construction machine including a power storage device for supplying electric power to a motor, an inverter, or the like. Background technique [0002] In recent years, hybrid vehicles and electric vehicles have been popularized from the viewpoint of energy saving in automobiles, and hybridization of construction machinery is also progressing. Generally, a construction machine such as a hydraulic excavator driven by a hydraulic system has a hydraulic pump that can perform maximum load work and can cope with all work from light load work to heavy load work; and a large engine that drives the hydraulic pump. [0003] However, heavy-duty operations such as heavy-duty excavation and loading of soil and sand frequently in construction machinery are part of the overall work, and engine performance is idle during light-load operations such as horizontal traction for leveling the ground. This is one of the factors that...

AI Technical Summary

Problems solved by technology

In this case, temperature unevenness occurs inside the plurality of single cells constituting the power storage device.

The temperature unevenness in the single cell will cause a deviation in the internal resistance of the single cell, and there will be parts where the current flows easily and parts where it is difficult to flow, and there is a concern that the deterioration of the battery will be accelerated

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