Electric working machine

JPWO2025069648A5Pending Publication Date: 2026-07-13
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Patent Information

Application Number
JP2025548525
Authority / Receiving Office
JP · JP
Patent Type
Applications
Filing Date
2025-07-25
Publication Date
2026-07-13

AI Technical Summary

Technical Problem

Electric work machines face challenges in efficiently managing battery temperature, particularly in cold environments, where conventional air cooling methods struggle to regulate battery temperature effectively, leading to battery deterioration and reduced energy efficiency.

Method used

The electric work machine incorporates a battery temperature adjustment circuit that circulates a heat medium, utilizing both a battery cooling heat exchanger cooled by a refrigerant and a battery warming heat exchanger heated by hydraulic oil, along with an electric heater, to achieve both cooling and heating performance.

Benefits of technology

This solution enables efficient regulation of battery temperature, suppressing battery deterioration and maintaining stable output, while reducing energy consumption and improving heating performance in low-temperature environments.

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Abstract

Provided is an electric working machine comprising a battery, an electric motor that uses electric power from the battery as a drive source, a hydraulic pump that is driven by the electric motor to pump operating oil to a hydraulic actuator, an operating oil cooling circuit that includes an oil cooler for cooling the operating oil, and a space cooling refrigerant circuit that circulates a space cooling refrigerant, wherein: the electric working machine includes a battery temperature regulating circuit that circulates a heat medium for adjusting the temperature of the battery; and the battery temperature regulating circuit includes an electric heater for heating the heat medium, a battery cooling heat exchanger that causes the heating medium to exchange heat with the space cooling refrigerant that circulate through the space cooling refrigerant circuit to cool the heating medium, and a battery warming-up heat exchanger that causes the heating medium to exchange heat with the operating oil that flows through the operating oil cooling circuit to heat the heat medium.
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