Battery Life and Charging Technology of China's Compact Electric Equipment Amid the Electrification Wave

I. Abstract

Driven by both the "dual carbon" goals and the environmental protection policies for non-road mobile machinery, China's construction machinery industry is accelerating its transition to electrification. Among them, electric compact excavators have become the main equipment for municipal construction, indoor construction, rural revitalization and other scenarios due to their advantages of zero emissions, low noise and adaptability to urban micro-engineering projects. As a key indicator of the core competitiveness of equipment, battery life and charging technology directly determine the market acceptance and whole-life cycle economy of electric compact excavators. Based on industry reports, corporate practices and technical data, this paper systematically analyzes the current status and influencing factors of battery life for battery life and charging technology of China's compact electric equipment, taking Sany, Liugong and Yuchai Equipment as examples.

A. Sany Heavy Industry: The "Benchmark for Electric Drive and Heavy Load" with Full-scenario Coverage（www.sany.com.cn  ）

As a star model of Sany's electric micro-excavators, the SY19E is precisely adapted to diverse scenarios such as small and medium-sized infrastructure construction, municipal pipe network transformation, rural road construction and residential area environmental improvement. Equipped with a high-safety lithium iron phosphate battery pack with outstanding thermal stability, it complies with the safety standards for power batteries of construction machinery. Under medium-intensity working conditions (4-6 hours of daily operation), its effective service life can reach 7-8 years. It supports 800V high-voltage DC fast charging technology, enabling a full charge for continuous operation in just 1.5 hours, which is a 50% improvement in charging efficiency compared with traditional low-voltage charging. Recharging during the noon break can meet the operation needs for the afternoon, perfectly aligning with the construction rhythm. Meanwhile, it is compatible with 230V AC slow charging, which can be fully charged after 8 hours of shutdown at night, meeting different recharging conditions. In addition, the model features zero emissions and low noise (idling noise ≤75 decibels). Operating in scenarios with high environmental requirements such as residential areas and school surroundings, it can avoid exhaust pollution and noise disturbance to residents, balancing efficiency, environmental protection and practicality.

B. Liugong: The "Pioneer of Electrification" with Scenario-customized Solutions（www.liugong.com  ）

Liugong's electrification layout started in 2014, with a cumulative delivery of over 5,000 electric products and the formation of 11 electric product lines, covering a full range of 1.7-135 ton excavators and diverse supporting equipment. It has formed differentiated solutions for heavy-load scenarios such as mines and steel plants.

Liugong 9017FE electric micro-excavator: Adapted to light-load scenarios such as municipal administration and gardening, its lithium iron phosphate battery supports 6-8 hours of continuous operation and can be fully charged in 1.5 hours via high-voltage fast charging, with the fully electronic control hydraulic system enabling precise movements. It supports 800V high-voltage DC fast charging, which can fully recharge the battery in 1.5 hours, and recharging during the noon break can meet the afternoon operation needs, with recharging efficiency matching the actual construction rhythm. The fully electronic control hydraulic system features sensitive response, lowering the operation threshold. It also has the advantages of zero emissions and low noise, which can avoid noise disturbance and exhaust pollution when operating in scenarios with high environmental requirements such as residential areas and indoor spaces, balancing operation efficiency and environmental protection requirements.

C. Yuchai: Vehicle-grade Battery Standards, Setting a New Benchmark for Safety and Durability of Compact Electric Equipment（www.yuchaicm.com  ）

Guangxi Yuchai Equipment Technology Co., Ltd. has been deeply engaged in the small and medium-sized construction machinery field for 37 years, being a national high-tech enterprise with more than 400 national patents. Its leading products have passed the EU CE certification and are exported to more than 100 countries and regions worldwide. As China's first manufacturer of micro-excavators, Yuchai relies on the world's pioneering wheel-side electric drive technology and self-developed Battery Management System (BMS), redefining the performance standards of compact electric equipment with vehicle-grade lithium iron phosphate batteries.

All series of Yuchai's compact electric equipment adopt vehicle-grade lithium iron phosphate batteries, supporting a dual-voltage system of household 220V and industrial 380V. Combined with double overcharge protection (at charging pile end + on-board BMS end), the battery automatically stops charging when fully charged, achieving industry-leading safety. Compared with ordinary industrial batteries, it has higher thermal stability and safety redundancy, as well as an ultra-long cycle life with more than 3,000 charge-discharge cycles. Calculated on the basis of one complete charge-discharge cycle per day, the service life is about 8-10 years. In addition, the anti-attenuation design is a major highlight: the capacity retention rate of Yuchai's electric equipment remains above 80% after 8 years of use, ensuring stable endurance of the equipment throughout its whole life cycle.

Taking the Yuchai Y120E electric excavator as an example, the overall width of the machine is only 1080mm, allowing it to easily pass through elevators and narrow doors, with noise lower than 75 decibels. Equipped with a fast charging system, it can be recharged to meet the afternoon operation needs with just 1 hour of charging during the lunch break. The 33.38kWh lithium iron phosphate battery, combined with an intelligent BMS thermal management system, can stably support 6-8 hours of continuous operation.

II. Charging Technology for Compact Electric Equipment: A Recharging System with Both Breakthroughs and Bottlenecks

 The maturity of charging technology directly determines the operational continuity of electric compact excavators. At present, the industry has formed a diversified recharging solution of "slow charging + fast charging". The upgrade of high-voltage platforms and the improvement of infrastructure supporting are the core breakthrough directions, while unbalanced regional development remains the main restrictive factor.

1. Current Mainstream Charging Technologies and Performance

Based on the characteristics of miniaturization and lightweight, the charging solutions for electric compact equipment mainly include AC slow charging, DC fast charging and dual working modes. AC slow charging is suitable for night maintenance scenarios, enabling a full charge within 8 hours; DC fast charging focuses on daytime recharging, with the 800V high-voltage platform technology realizing a full charge in 1.5 hours, and some high-end models can meet the demand of "15 minutes of fast charging supporting 8 hours of operation"; the dual working mode solves the endurance limitation of fixed-site operation through the switching between battery power and wired power.

AC slow charging is mainly applicable to night shutdown maintenance scenarios, while DC fast charging focuses on rapid daytime recharging. At present, the 800V high-voltage platform combined with 4C charging rate technology has achieved major breakthroughs. Models such as Sany SY19E, Liugong 9017FE and Yuchai's electric equipment all support full DC fast charging in 1.5 hours.

2. Current Status and Challenges of Charging Infrastructure Construction

Driven by policies, the construction of special charging infrastructure for construction machinery is accelerating. By 2025, TELD has built 380 special charging stations, and the State Grid's fast charging network covers 85% of county-level regions. The Blue Book on the Development of New Power Systems has clearly set a goal of building 50,000 special charging stations by 2026.

III. Future Trends: Dual-driven by Technological Innovation and Ecological Improvement

In the future, the battery and charging technology of electric compact excavators will be upgraded towards "longer service life and faster recharging", with the commercialization of solid-state batteries and the improvement of charging networks as the core directions.

In terms of battery technology, the cycle life of solid-state batteries is expected to exceed 5,000 times, with an energy density breaking through 400Wh/kg, which can extend the continuous operation time to more than 14 hours. Technological innovations in materials and integration by enterprises such as CATL and BYD will drive the energy density of mass-produced models to 280-320Wh/kg by 2028.

Charging technology will focus on high-voltage fast charging and diversified recharging. The industry standard of "30 minutes of charging to 80% on 800V platform" is planned to be realized in 2026, and the pilot of wireless charging has achieved breakthroughs. Business model innovations such as battery banks and ultra-fast charging station construction will accelerate infrastructure improvement and cost optimization.

At present, the battery life and charging technology of China's electric compact excavators have entered the mature application stage. The 5-8 year service life of lithium iron phosphate batteries and the 1.5-hour fast full-charge performance can meet the needs of most engineering scenarios. In the future, with the iteration of solid-state battery and high-voltage fast charging technologies and the improvement of charging infrastructure, their whole-life cycle economy will be further enhanced.

Users need to master scientific usage methods to extend battery life, and the industry needs to promote the coordinated development of technology and infrastructure, solve the bottleneck of unbalanced regional development, and boost the in-depth transition of construction machinery to electrification.