Against the backdrop of the continued advancement of the “dual carbon” strategy and increasingly stringent emission standards for non-road construction machinery, the electrification of construction machinery is accelerating from pilot demonstrations toward large-scale commercial deployment. However, problems such as insufficient driving range, poor adaptability of fixed energy replenishment facilities, a lack of grid coverage in remote locations, and difficulty meeting high-power charging demand have become increasingly prominent. The lagging development of energy replenishment systems has become a major bottleneck restricting comprehensive electrification. From four perspectives—the current state of industry development, the shortcomings of traditional energy replenishment models, the technical advantages of flexible mobile energy replenishment, and its value across diverse application scenarios—this article provides an in-depth analysis of the necessity and implementation path of mobile energy replenishment for construction machinery, offering a systematic reference for the industry’s green transformation.

I. Current Status of Construction Machinery Electrification: The “Development Mismatch” between Large-Scale Deployment and Energy Replenishment Shortcomings

Driven by both policy requirements and technological advancement, China’s construction machinery industry has completed the critical transition from pilot demonstrations to large-scale deployment. Currently, mainstream electric construction equipment—including electric excavators above the 60-ton class, large electric mining trucks, port quay cranes, and electric cranes—is widely used in mining, port operations, infrastructure construction, municipal renovation, and other scenarios. Compared with conventional fuel-powered equipment, electric construction machinery offers three core advantages:

· Operation and maintenance costs reduced by 30%-60%: Electric equipment provides significantly higher energy efficiency than fuel-powered equipment, substantially reducing overall operation and maintenance expenses

· Zero exhaust emissions throughout operation: Carbon emissions and particulate pollution are completely eliminated, closely aligning with the “dual carbon” strategy and green construction policies

· Lower operating noise: Provides clear environmental advantages in municipal construction, nighttime operations, and other noise-sensitive scenarios

However, behind the industry’s rapid development, the severe lag in energy replenishment infrastructure has become increasingly apparent, creating a clear “development mismatch.” The industry currently relies heavily on fixed power grids and infrastructure-based energy replenishment, which cannot accommodate the dynamic and mobile operating characteristics of construction machinery. Grid capacity expansion takes 1-2 years, remote sites lack electricity coverage, utilization rates of fixed charging equipment remain below 30%, and there is a significant shortage of high-power energy replenishment capacity. As a result, large numbers of electric machines are restricted to enclosed and fixed operating environments near the power grid, seriously hindering electrification in critical construction scenarios such as remote mines and infrastructure projects.

Core conclusion: The lagging development of energy replenishment systems has become the primary obstacle to the comprehensive electrification of construction machinery.

II. In-Depth Analysis of the Three Major Shortcomings of Traditional Energy Replenishment Models

Construction machinery operations have five core characteristics: high mobility, dispersed operating locations, heavy loads and high energy consumption, harsh working conditions, and frequent relocation. The three traditional energy replenishment models—fixed charging, battery swapping, and diesel power generation—all have inherent shortcomings and are increasingly incompatible with the industry’s dynamic and diversified energy replenishment requirements.

2.1 Fixed Charging—High Dependency, Low Utilization, and Long Waiting Times

Fixed high-power fast charging places extremely high demands on regional grid capacity. Grid expansion at ports, mines, and similar sites can take 1-2 years, while most remote operating areas lack grid coverage, resulting in large numbers of idle charging piles. Construction equipment frequently relocates across regions, leaving fixed charging piles with an actual asset utilization rate below 30% and an extremely low return on investment. More importantly, each high-power fast-charging session takes 40-60 minutes, directly occupying productive shift time, delaying construction schedules, causing economic losses, and seriously reducing construction efficiency.

2.2 Battery Swapping—High Investment, Poor Compatibility, and Limited Flexibility

Standardized battery-swapping stations require initial investments of several million yuan, as well as substantial inventories of spare batteries for rotation, creating considerable financial pressure. More importantly, batteries for large port machinery and mining trucks are highly customized, while excavators, cranes, and other equipment involve numerous brands, tonnage classes, and models. The industry currently lacks unified battery interface and capacity standards—making cross-brand and cross-model battery swapping extremely difficult and standardized battery swapping almost impossible to implement in the construction machinery industry. In addition, battery-swapping stations are fixed in place and cannot follow dynamically shifting mining areas or infrastructure construction sites, making them unsuitable for mobile operations.

· Initial investment of several million yuan + large inventories of spare batteries, resulting in substantial financial pressure

· No industry standards for battery interfaces/capacity, making cross-brand and cross-model battery swapping nearly impossible

· Fixed battery-swapping station locations cannot accommodate mobile operations

2.3 Diesel Power Generation—High Cost, Heavy Pollution, and Contrary to the Original Purpose of Green Development

At remote construction sites and outdoor mining areas without grid coverage, diesel generators remain the primary traditional means of temporary energy supply. However, this model has major disadvantages. On the one hand, diesel generation produces high noise levels and heavy exhaust emissions, fundamentally conflicting with “dual carbon” emission-reduction targets and green construction requirements. On the other hand, due to fluctuating fuel prices and frequent equipment maintenance, the total cost of diesel power generation is more than 40% higher than grid-based energy replenishment. This directly offsets the core cost advantage of electric construction machinery and eliminates the practical economic value of equipment electrification.

Key insight: The use of diesel power generation effectively eliminates the economic and environmental advantages of electrification and is essentially a form of “pseudo-electrification.”

2.4 Summary of the Core Conflict: From “Equipment Finding Electricity” to “Electricity Finding Equipment”

The fundamental shortcoming of traditional energy replenishment models is their fixed power supply and passive adaptability, consistently following the logic of “equipment finding electricity.” Construction machinery operations, however, require dynamic power supply and proactive adaptability—“electricity finding equipment.” This fundamental conflict means that a flexible mobile energy replenishment system based on mobile energy storage vehicles + power replenishment cabinets is the optimal solution for overcoming the energy replenishment bottleneck.

III. Flexible Mobile Energy Replenishment System: A Paradigm Revolution and Technical Architecture

The new integrated flexible energy replenishment system comprising mobile energy storage vehicles + power replenishment cabinets completely transforms the traditional “equipment finding electricity” model and creates a new form of energy replenishment in which “electricity moves with the equipment.” The system’s core unit—the power replenishment cabinet—is specifically developed for the heavy-load, high-frequency, and harsh operating requirements of construction machinery. It delivers comprehensive upgrades across five dimensions: power output, environmental adaptability, safety protection, energy storage efficiency, and structural stability.

3.1 High-Power Output Compatible with Multiple Equipment Categories: One Cabinet for Multiple Uses and Full Equipment Coverage

The power replenishment cabinet incorporates two sets of DC/DC converters with a total output power of up to 2,000kW, allowing it to replenish energy for two large electric excavators simultaneously at full power. It is equipped with four MCS high-power charging sockets—two operating and two standby—+ two general-purpose Chinese-standard charging sockets. Each charging gun supports ultra-high-current output of 1,500V/1,600A. It can meet the megawatt-level fast-charging requirements of large mining trucks and port machinery while also supporting conventional charging for medium and small excavators and electric cranes. This enables one cabinet to serve multiple purposes, support all categories of construction machinery, and replenish energy for several machines simultaneously.

3.2 Full Adaptability to Extreme Environments: Stable Operation from -40℃ to +55℃

The complete system offers exceptional environmental adaptability, with an operating temperature range of -40℃ to +55℃ and a storage tolerance range of -40℃ to +70℃. Core electrical components use a fully potted sealing process, while the complete machine has passed specialized salt-spray and sulfur-dioxide corrosion protection tests. It can reliably accommodate extreme and complex environments, including high dust levels in mines, high salt spray at ports, large day-night temperature differences at outdoor infrastructure sites, and high-altitude cold conditions. It maintains stable year-round operation without power derating, completely resolving energy replenishment challenges in extreme environments.

· Operating temperature: -40℃ to +55℃; storage temperature: -40℃ to +70℃

· Core electrical components: Fully potted sealing process

· Protection tests: Specialized certification for salt-spray and sulfur-dioxide corrosion resistance

· Applicable environments: High-dust mines, high-salt-spray ports, high-altitude cold regions, and outdoor environments with large temperature variations

3.3 Three-Level BMS + Dual Fire Protection: A Full-Process Safety Protection System

The equipment incorporates a three-level BMS battery management system capable of accurately collecting cell voltage data within milliseconds. It supports automatic isolation of a faulty battery cluster and active balancing between cell clusters, preventing battery operating risks at the source. The system also features a dual fire protection system comprising heptafluoropropane + PACK-level aerosol protection, together with comprehensive smoke and temperature detectors for real-time fire monitoring, proactive warnings, and rapid response. Multiple electrical protection measures—including grounding protection, leakage protection, overcurrent protection, and overvoltage protection—create a comprehensive, full-process safety system that protects both personnel and equipment during heavy-duty energy replenishment.

3.4 Ultra-Large Energy Storage + Efficient Cycling: Core Support Matched to Work-Shift Schedules

The battery system of the power replenishment cabinet has a rated capacity of 4,179kWh, a cell cycle life exceeding 6,000 cycles, support for 90% depth of discharge, and an overall system energy efficiency of ≥88%. A single cabinet can support eight hours of continuous full-load operation for one large electric excavator. The equipment supports a 0.5C fast-charging rate and can be fully charged within two hours. It can also use a ground charging station for 2,000kW high-power recharging, perfectly matching the construction industry’s standard shift pattern of “daytime operation and centralized nighttime charging” while ensuring uninterrupted construction.

3.5 Vibration Resistance and Durability + Intelligent Maintenance: Ensuring Long-Term Operating Economy

To address transportation shocks and operational vibrations, the battery cells are reinforced and secured using a rectangular structural adhesive arrangement, while the complete machine incorporates multiple levels of rubber vibration-isolation pads to prevent resonance damage. The equipment wiring harness has a service life of up to ten years or more. The DC/DC converter adopts a modular split design, allowing faulty components to be quickly replaced on site for convenient and efficient maintenance. The equipment also incorporates a low-energy intelligent standby mode that automatically disconnects the high-voltage DC circuit during non-operating periods, significantly reducing idle energy consumption and saving operating costs.

IV. Analysis of Implementation Value across Four Core Scenarios

The integrated flexible energy replenishment solution comprising mobile energy storage vehicles + power replenishment cabinets effectively supplements and comprehensively upgrades traditional fixed energy replenishment systems. It provides targeted solutions to energy replenishment challenges in four core scenarios: ports, mines, infrastructure construction, and municipal engineering.

4.1 Port Scenarios: Load Buffering + Nearby Charging for Dispersed Yards + Adaptability to Highly Corrosive Environments

Port quay cranes, yard cranes, electric terminal tractors, and other equipment require 24-hour uninterrupted operation. High equipment density and substantial power demand can easily overload the port’s power grid during peak periods. A flexible mobile energy replenishment system can serve as a mobile load-buffering resource, diverting grid pressure during electricity-demand peaks and preventing shutdowns caused by overload. Small port machines and mobile equipment operating in remote and dispersed yards can receive energy nearby without the installation of additional fixed charging piles, substantially reducing infrastructure investment. The equipment’s high salt-spray resistance and wide-temperature weatherability also make it ideally suited to humid and highly corrosive coastal environments.

· Mobile load buffering: Diverts grid pressure during peak electricity demand and prevents overload shutdowns

· Nearby energy replenishment for dispersed yards: No additional fixed charging piles required, reducing infrastructure investment

· Adaptability to highly corrosive environments: Salt-spray protection certification ensures long-term stable operation

4.2 Mining Scenarios: Zero-Infrastructure Deployment + Ultra-Large Energy Storage Support + Adaptability to Harsh Operating Conditions

Mines are the most challenging energy replenishment environments for construction machinery. Open-pit mining areas continuously relocate, while underground mines and remote mining areas lack access to the public power grid, creating a persistent electrification dilemma in which “the equipment is electric, but no electricity is available on site.” The flexible mobile energy replenishment solution requires no grid expansion or civil infrastructure and can begin operating on the day it arrives, fundamentally solving energy replenishment problems in off-grid environments. Its 4,179kWh ultra-large energy storage capacity can support continuous operation of multiple mining trucks and excavators, while its 2,000kW high-power output perfectly meets the fast-charging requirements of heavy mining trucks. Its dustproof, vibration-resistant, and corrosion-resistant structural design can easily withstand the high dust levels, strong vibrations, and corrosive conditions found in mining environments.

· Zero-infrastructure deployment: No grid expansion/civil infrastructure required; ready for use on the day of arrival

· 4,179kWh ultra-large energy storage: Supports continuous operation of multiple mining trucks and excavators

· 2,000kW high-power output: Meets megawatt-level fast-charging requirements for heavy mining trucks

· Adaptability to harsh operating conditions: Dustproof, vibration-resistant, and corrosion-resistant for stable operation throughout mining areas

4.3 Infrastructure Construction Scenarios: Flexible Arrival and Relocation + Simultaneous Multi-Equipment Charging + Lightweight, Low-Cost Operation

Highway, railway, bridge, and other infrastructure projects feature short construction cycles, dispersed operating locations, and frequent cross-regional relocation. Traditional fixed charging and battery-swapping facilities require long construction periods and high investment, while the facilities cannot be reused after project completion, resulting in extremely low returns on investment. Mobile energy storage and replenishment equipment can flexibly enter a project site and quickly relocate after completion. One system can repeatedly serve multiple construction sites, effectively spreading energy replenishment investment across several projects. It also supports simultaneous energy replenishment for multiple excavators, cranes, and loaders. Combined with a low-energy standby design, it reduces operating energy consumption during idle periods.

· Flexible arrival and relocation: One system can repeatedly serve multiple construction sites, spreading investment costs

· Simultaneous multi-equipment charging: Supplies electricity to multiple excavators, cranes, and loaders at the same time

· Lightweight and cost-effective: Relocates immediately after project completion, delivering a high return on investment

4.4 Municipal Engineering Scenarios: Zero Emissions and Low Noise + Compact Deployment + Multiple Safety Protections

Municipal projects such as urban road maintenance, old-city demolition, and pipeline network renovation impose strict environmental and noise-control requirements. Diesel-powered equipment is generally prohibited in central urban areas, while most temporary construction sites lack grid access. The flexible mobile energy replenishment system produces zero emissions and low noise throughout operation, fully meeting urban green construction standards and completely replacing traditional diesel generators. Its compact overall structure and flexible deployment accommodate confined urban construction sites, while multiple safety protection measures effectively reduce energy storage risks in densely populated areas.

4.5 Extended Scenario: Rapid Energy Support for Emergency Rescue

Beyond the four core scenarios, the flexible energy replenishment solution can be widely used for emergency rescue operations. It can rapidly reach off-grid emergency areas affected by flooding, landslides, road damage, and other incidents, providing stable, clean, and high-power energy replenishment for electric rescue equipment. This significantly improves emergency rescue efficiency and expands the boundaries of energy support for construction operations.

V. Comparative Analysis: Traditional Energy Replenishment vs. Flexible Mobile Energy Replenishment

The following table systematically compares traditional fixed energy replenishment models with flexible mobile energy replenishment systems across six core dimensions, clearly demonstrating the comprehensive advantages of mobile energy replenishment:

VI. Frequently Asked Questions about Energy Replenishment for Electric Construction Machinery (FAQ)

Q1: Why is energy replenishment for electric construction machinery more difficult than for passenger vehicles?

Construction machinery operations involve high mobility, dispersed operating locations, heavy loads and high energy consumption, harsh working conditions, and frequent relocation. These characteristics are completely different from passenger vehicle charging scenarios involving fixed routes, low power demand, and extensive grid coverage. Construction equipment may require megawatt-level power for a single charging session, and it frequently operates in remote off-grid areas that cannot be covered by fixed charging facilities.

Q2: How long can the 4,179kWh capacity of a mobile energy storage vehicle support equipment operation?

A single cabinet with 4,179kWh of electricity can support eight hours of continuous full-load operation for one large electric excavator or replenish energy for several medium and small machines simultaneously. Combined with 2,000kW high-power nighttime recharging, it perfectly accommodates the standard shift pattern of “daytime operation and nighttime charging.”

Q3: Can the power replenishment cabinet operate reliably in extreme environments?

The equipment has an operating temperature range of -40℃ to +55℃. Its core electrical components use a fully potted sealing process, and the complete machine has passed salt-spray and sulfur-dioxide corrosion protection tests. It can operate reliably throughout the year without power derating in extreme environments such as high-dust mines, high-salt-spray ports, and high-altitude cold regions.

Q4: What is the return on investment of a flexible mobile energy replenishment solution?

Compared with the multimillion-yuan initial investment required for fixed charging and battery-swapping stations, mobile energy replenishment equipment requires no infrastructure and can be flexibly relocated and reused. One system can repeatedly serve multiple construction sites/projects, effectively spreading energy replenishment investment across several projects and delivering a significantly higher return on investment than fixed energy replenishment models.

Q5: Can mobile energy replenishment solutions replace all fixed energy replenishment facilities?

Flexible mobile energy replenishment effectively supplements and comprehensively upgrades traditional fixed energy replenishment systems. It can work together with fixed charging and battery-swapping facilities in enclosed, fixed environments near the power grid. In remote, mobile, and off-grid environments, it is the only feasible solution. Together, the two systems create a complete energy replenishment network.

VII. Future Outlook and Industry Recommendations

The comprehensive electrification of construction machinery is an irreversible industry trend. The evolution and upgrading of energy replenishment systems will determine both the speed and quality of the electrification transition. Traditional charging and battery-swapping models that are fixed, standardized, and heavily dependent on infrastructure can no longer accommodate the mobile, dynamic, and diversified operating characteristics of construction machinery. In the future, energy replenishment systems for construction machinery will inevitably evolve toward mobility, flexibility, modularity, zero-infrastructure deployment, and all-scenario coverage.

The new flexible energy replenishment system centered on mobile energy storage vehicles + power replenishment cabinets directly addresses the core shortcomings of traditional energy replenishment. With core advantages including zero-infrastructure deployment, adaptability to all operating conditions, compatibility with multiple equipment models, high safety, and low cost, it removes the final obstacle to the comprehensive electrification of construction machinery. As the “dual carbon” strategy continues to advance, accelerating the implementation and business-model innovation of flexible mobile energy replenishment technologies will fully unlock the energy-saving, environmental, and cost advantages of electric construction machinery.

Recommended Industry Actions

1. Accelerate technological development: Continuously improve the power density, energy storage capacity, and environmental adaptability of power replenishment cabinets while reducing the unit cost of energy replenishment

2. Unify charging and discharging standards: Promote unified industry standards for construction machinery battery interfaces, capacity, and communication protocols to eliminate cross-brand and cross-model energy replenishment barriers

3. Innovate energy operation models: Explore diversified business models such as energy replenishment service leasing, usage-based billing, and managed energy services to reduce users’ initial investment requirements

4. Build a new energy supply network: Use flexible mobile energy replenishment as the core node and coordinate it with traditional fixed charging and battery-swapping systems to create an all-scenario energy support system for construction machinery

5. Promote supporting policies: Industry authorities are encouraged to incorporate flexible mobile energy replenishment into policy-support systems for construction machinery electrification and provide incentives such as equipment procurement and operating subsidies