1. Overview of the Four-Wheel EV Charging Station Industry
1.1 Industry Background
The new energy vehicle industry has entered a stage of explosive growth. The number of new energy vehicles in China has exceeded 20 million, and the penetration rate continues to rise. As an important support for the popularization of new energy vehicles, charging infrastructure is facing unprecedented development opportunities and challenges. The national "New Energy Vehicle Charging Infrastructure Development Guide" clearly proposes to establish a relatively complete charging infrastructure system by 2025, and local governments have also introduced numerous policies to support the construction of charging infrastructure. Meanwhile, the EV charging station operation market is rapidly maturing, shifting from the land-grabbing stage to the refined operation stage, requiring a higher level of intelligence from EV charging station management platforms.
IoT technology is the core foundation for the intelligent management of four-wheel EV charging stations. Through IoT connectivity, EV charging stations report operational data in real time, allowing the operation platform to accurately grasp the status of each device; orderly charging algorithms dynamically schedule charging power based on real-time load data; users can check available EV charging stations, make charging reservations, and monitor charging progress in real time via the app. The IoT charging management system turns scattered EV charging stations into a unified smart charging network, which is a core technical capability for charging operators to enhance competitiveness.
1.2 How the Chargers Split
Four-wheeled electric vehicle charging stations are classified into two main types based on charging methods: direct current (DC) charging stations (fast chargers) and alternating current (AC) charging stations (slow chargers). DC charging stations convert AC power into DC and output it directly to the vehicle battery, with charging power typically ranging from 30kW to 360kW. Charging can be completed in 20 minutes to 1 hour, making them suitable for highway service areas, public fast charging stations, and similar scenarios. AC charging stations output AC power and charge the battery through the onboard charger, with power generally between 3.3kW and 22kW. Charging takes 4-8 hours, making them suitable for nighttime parking at homes, workplaces, and other locations.
2. Core Pain Points Facing the Four-Wheeled Charging Station Industry
2.1 Low Utilization of Charging Stations and Difficulty in Profitability
Despite the rapid growth in the number of charging stations, the overall low utilization rate is a common challenge in the industry. Statistics show that the average utilization rate of public charging stations in China is less than 10%, leaving a large number of stations idle and resulting in a long investment payback period. Uneven utilization is the main issue: charging stations in popular business districts or highway service areas have long queues, while those in remote areas are seldom used. Optimizing charging station locations, improving operational efficiency, and attracting and retaining users are core operational challenges faced by charging operators.
2.2 High Equipment Failure Rate and High Operation & Maintenance Costs
Charging station equipment operates outdoors for long periods and is affected by high temperatures, humidity, and dust, leading to a relatively high failure rate. In the traditional passive maintenance model, equipment failures are often discovered only through user complaints, delaying response and affecting user experience and revenue. Maintenance engineers need to travel to various locations to handle faults, resulting in high labor and transportation costs, and response times are slow. There are many charging station brands, and the equipment interfaces and data formats of different manufacturers are not standardized, which increases the complexity of platform integration and operation management.
2.3 Insufficient Power Distribution Capacity Restricts Development
Fast charging requires high-power electricity supply, but many locations have limited power distribution capacity and cannot meet the demand for multiple electric vehicles to fast charge simultaneously. Upgrading the power distribution system is costly and time-consuming, becoming a significant bottleneck for charging station construction. During peak electricity usage periods, power capacity is tight, which may trigger overload protection and affect the stability of charging services. How to serve as many users as possible under existing power distribution constraints through intelligent scheduling is a technical issue that operators urgently need to solve.
3. Where IoT Is Used on a Car Charger
3.1 Cloud Monitoring of Each Charger
The cloud management platform for EV charging stations uses IoT technology to connect each charging device in real-time, providing a comprehensive understanding of device operating status. Monitoring includes: EV charging station online/offline status, each connector's occupied, idle, or fault state, current charging power, charging energy, charging duration, ambient temperature, and other parameters. The anomaly alert system automatically identifies and pushes alerts for issues such as device offline status, abnormal charging power, a connector fault, and communication interruptions, notifying maintenance personnel immediately. Remote diagnostics determine whether on-site handling is needed, resolving many "false faults" online and reducing unnecessary dispatch.
The equipment ledger management system records the installation location, device model, network connection time, maintenance records, and other information for each EV charging station. Combined with operational data, it analyzes equipment health trends. Predictive maintenance models, based on historical fault data and device operation characteristics, anticipate potential faults in advance and schedule maintenance ahead of time, upgrading from "post-fault handling" to "pre-fault prevention."
3.2 Intelligent Scheduling for Orderly Charging
Ordered charging is a key technology to alleviate insufficient distribution capacity and reduce electricity costs. The ordered charging system collects real-time load data from distribution transformers and charging demands from each EV charging station. On the premise of ensuring users' charging needs, it reasonably allocates the charging power of each EV charging station through intelligent algorithms, ensuring that the total power does not exceed the distribution capacity constraints and avoiding triggering transformer overload protection. During low electricity price periods, users are encouraged to charge and allocated more power; during peak price periods, charging power is appropriately reduced, guiding off-peak charging and lowering electricity costs.
Fleet charging management is an important application scenario of ordered charging. Enterprise fleets, bus companies, and logistics companies have a large number of electric vehicles that need to be charged regularly. Through the ordered charging scheduling system, charging times and power for each vehicle are intelligently planned according to departure times and battery requirements, ensuring that all vehicles are fully charged before departure while avoiding exceeding distribution limits, achieving safe, economical, and efficient fleet charging management.
3.3 User Services and Interconnectivity
A good user experience is key to enhancing the competitiveness of charging stations. Charging apps provide real-time EV charging station status inquiries, navigation to stations, charging reservations, and other functions, allowing users to know the availability of destination EV charging stations before departure, reducing wait times upon arrival. During charging, the app shows real-time charging power, charged amount, and estimated completion time, sending notifications once charging is complete so users do not need to wait. Scan-to-charge and contactless payment greatly lower usage barriers, and NFC tap-to-start charging makes operation simpler.
Interconnectivity is an important direction for enhancing the value of EV charging stations. When charging operation platforms connect to third-party aggregation platforms (such as Gaode, Baidu Maps, Teld, etc.), they synchronize EV charging station information and real-time status across these platforms, expanding user coverage. The national EV charging station interconnectivity platform integrates charging data nationwide, enabling cross-operator unified charging, allowing users to charge nationwide without downloading multiple apps, greatly improving charging convenience.
3.4 Digital Operation of Charging Stations
Comprehensive collection and in-depth analysis of charging station operation data provide a basis for refined operational decision-making. Key operational indicators include: charging utilization rates at different time periods, the online rate of EV charging stations, user satisfaction scores, revenue composition analysis, energy consumption cost analysis, etc. Utilization heat maps intuitively show the distribution of charging demand at different times and locations, guiding adjustments in the number of EV charging stations. User behavior analysis reveals the charging habits of typical users, providing references for targeted marketing and value-added service design. Abnormal revenue analysis identifies billing system failures or unusual electricity usage, protecting operational revenue.
4. What the Link Has to Do
4.1 OCPP Protocol and Interoperability
OCPP (Open Charge Point Protocol) is an international standard protocol for communication between charging stations and operation management systems. Currently, OCPP 1.6 and OCPP 2.0 versions are widely adopted. The OCPP protocol defines the communication interface between charging stations and the Charging Station Management System (CSMS), including functionalities such as start/stop charging, status retrieval, remote control, firmware updates, and metering data transmission. Supporting the OCPP protocol means that a charging station can connect to any management platform that supports this protocol, avoiding being locked to a single vendor and protecting the operator's system investment. In China, there is also the EVCS protocol based on the national standard GB/T 34657. Domestic brand charging stations typically support both OCPP and the national standard protocol simultaneously.
4.2 4G/5G IoT Communication
Charging stations are deployed in a wide range of locations, from indoor parking lots to outdoor public areas, from urban commercial districts to highway service areas, requiring adaptation to various network environments. 4G IoT SIM cards are currently the most commonly used communication solution for charging stations, offering wide coverage, moderate cost, and bandwidth sufficient for charging data transmission. SimtoLink provides IoT SIM cards optimized specifically for charging station scenarios, supporting automatic switching among multiple networks including Mobile, Unicom, and Telecom, and automatically switching to the operator with a stronger signal when the signal is weak, ensuring stable online connectivity for the charging station. The gradual popularization of 5G networks will provide charging stations with lower latency communication, supporting more sophisticated orderly charging scheduling algorithms and richer value-added services.
V. Development Trends of Four-Wheel Charging Stations
5.1 The Era of Ultra-Fast Charging Arrives
Supercharging (ultra-fast charging) is the fundamental solution to alleviating the energy replenishment anxiety of new energy vehicles. An 800 V platform with a liquid-cooled ultra-fast charger can pass 300 kW, adding more than 200 km of range in 5 minutes, close to the time a fuel stop takes. Supercharging stations require extremely high distribution capacity and grid facilities and need supporting energy storage systems to mitigate the impact on the grid. The IoT platform watches and schedules those ultra-fast chargers more closely, so the system stays safe. As the number of supercharging-compatible vehicles increases, the supercharging network will become an important component of charging infrastructure.
5.2 Integrated Solar-Storage-Charging Stations
The integrated solar-storage-charging model, combining rooftop photovoltaics, energy storage, and EV charging stations, is an innovative solution to meet the peak power demand of charging stations and reduce electricity costs. During the day, power generated by photovoltaics is stored in the energy storage system if in excess; during peak electricity demand, the stored energy discharges to supplement charging power; during the night off-peak, the storage recharges. The IoT energy management system coordinates the scheduling of photovoltaics, storage, and charging loads to achieve optimal energy allocation. Integrated solar-storage-charging not only reduces electricity costs but also lessens the peak impact on the grid, generating additional electricity market revenue, making it a sustainable development direction for charging station construction.
5.3 Vehicle-to-Grid (V2G)
Vehicle-to-Grid (V2G) allows electric vehicles to discharge to the grid when not in use, using their batteries as distributed energy storage resources to participate in power system regulation. V2G technology relies on bidirectional EV charging stations and smart energy management systems, coordinating the charging and discharging behavior of thousands or even tens of thousands of electric vehicles through an IoT platform, discharging to assist peak shaving during system peak periods, and charging to store energy during off-peak periods, earning corresponding electricity market revenue. The maturation and commercialization of V2G technology will transform electric vehicles from merely a power load into an important component of smart energy systems.
6. Conclusion
The four-wheel charging station industry is currently transitioning from scale expansion to quality improvement, and IoT technology is the core driving force behind this transformation. IoT applications such as cloud monitoring, orderly charging, user services, and operational analysis help charging operators improve equipment utilization, reduce maintenance costs, optimize user experience, and achieve efficient intelligent operation of charging services.
SimtoLink focuses on the field of IoT connectivity, providing charging station equipment with stable and reliable 4G/5G IoT SIM cards and communication modules, supporting nationwide and global network coverage to ensure round-the-clock online operation of charging stations. Whether building a self-operated charging station platform or connecting to a third-party platform, SimtoLink can provide the most suitable communication connectivity solution.