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Ankerui Electric Co., Ltd
Development of New Energy Charging Stations and Ankerui DC Insulation Monitoring Solution
Date: 2025-12-31Read: 5
Tang Xueyang
Ankerui Electric Co., Ltd. Shanghai Jiading 201801
1、 The current development status of charging piles under the wave of new energy
As of the end of November 2025, China's charging facilities (guns) have reached 19.322 million (+52% year-on-year), including 14.697 million private piles (76.1%,+57.8% year-on-year) and 4.625 million public piles (+36% year-on-year, with an average power of 45.34 kW), with a pile to vehicle ratio of approximately 1:2.07 and a scale. Technologically upgrading to 350kW+/480kW overcharging and 800V platform adaptation, expanding the scope of light storage charging and V2G pilot projects, and improving compatibility with national standards. The market is concentrated at the top (with special calls accounting for over 60% of public piles), and is shifting from "competing in quantity" to "improving efficiency and filling gaps (rural/high-speed)". Policies are promoting "doubling in three years", focusing on safety and service optimization.
2、 The technological development trend of charging stations
Charging pile technology is iterating towards "faster, smarter, more energy-efficient, and safer", and the core trend can be summarized into six points:
1. Supercharging and acceleration: The mainstream upgrade is towards 350kW/480kW, compatible with 800V high-voltage platforms, with a replenishment of 300km+in 10-15 minutes. Commercial vehicles are piloting megawatt level fully liquid cooled supercharging.
2. Device and heat dissipation upgrade: Silicon carbide (SiC) devices have become standard, with an efficiency of 98%; Fully liquid cooled coverage gun line/module, supporting continuous high current output.
3. Intelligent and vehicle network interaction: AI predictive operation and maintenance, V2G bidirectional charging and discharging scale pilot, automatic charging robot landing, improving efficiency and grid coordination.
4. Integrated photovoltaics, energy storage, and charging: The deep integration of photovoltaics, energy storage, and charging reduces grid dependence and peak valley arbitrage, and improves system efficiency by 3% -5%.
5. Safety and standardization: Full chain insulation/arc/temperature monitoring, GB/T series standard unified interface and communication, strengthened fire and explosion prevention.
6. Expansion of energy replenishment forms: Wireless charging is upgraded to 50kW, commercial vehicle battery swapping is standardized, and it complements supercharging.
3、 AIM-D500-CA: Security Guard for Charging Stations
In the face of the severe challenge of insulation issues at charging stations, the AIM-D500-CA insulation monitoring device stepped forward and became a solid defense line to safeguard the safety of charging stations. The signal injection monitoring technology it adopts is like installing a pair of "smart eyes" on the charging pile, which can continuously monitor the insulation resistance of the positive and negative poles of the DC system inside the charging pile to ground 24 hours a day.
When there is a slight change in insulation resistance, AIM-D500-CA can quickly capture these signals and analyze and process them through built-in precision algorithms. Once the insulation resistance falls below the set warning value, it will immediately issue a warning signal, like a loyal guardian, reporting potential safety hazards to the staff. For example, at a large charging station, AIM-D500-CA successfully detected a decreasing trend in the insulation resistance of a charging station and issued a timely warning. After receiving the notification, the staff quickly inspected and repaired the charging station, avoiding a possible safety accident.
Compared with traditional manual inspection and passive alarm methods, AIM-D500-CA has advantages. Traditional methods often rely on manual regular inspections, which are not only inefficient but also difficult to detect potential insulation issues in a timely manner. The AIM-D500-CA can realize real-time online monitoring. It can stick to its position and never miss any potential safety hazard, no matter in the day or night, in the hot sun or in the storm. Its warning function also advances the safety line, detecting and solving problems in a timely manner when they are still in their infancy, effectively avoiding accidents and greatly improving the safety and reliability of charging stations.
Besidesreal-time monitoringandAccurate warning， AIM-D500-CA also has powerful capabilitiesFault diagnosis functionWhen the insulation resistance continues to decrease and reaches the alarm value, it will immediately send out an alarm signal. At the same time, through the "Insulation Evaluation" submenu, key parameters such as positive pole to ground voltage, negative pole to ground voltage, positive pole to ground resistance, and negative pole to ground resistance will be clearly displayed, helping workers quickly and accurately assess the location and severity of faults, and providing strong basis for timely and effective maintenance measures. In practical applications, this function of AIM-D500-CA has played an important role. At a charging station in [specific case location], AIM-D500-CA detected an insulation fault in a charging station. Through the detailed information provided in the "Insulation Assessment" submenu, maintenance personnel quickly identified the fault point and completed the repair work in just an hour, restoring the normal use of the charging station and greatly reducing downtime caused by faults, thus improving the operational efficiency of the charging station.
4、 Product selection of AIM-D series DC insulation monitoring instrument
The AIM-D series DC insulation monitoring instrument is designed specifically for DC systems and is used for detecting grounding faults in ungrounded DC systems. When a grounding fault occurs in the DC system, an insulation fault alarm signal can be issued.
The product can be applied inDC systems such as power generation manufacturers, DC screens in substations, electric vehicle charging devices, UPS power supply systems, photovoltaic DC systems, energy storage systems, and other DC power grids.
5、 Application of DC Insulation Monitoring Instrument
Application in DC charging stations
The electric vehicle charging device generally consists of a cabinet, multiple AC to DC charging modules, an intelligent switching unit, measuring instruments, controllers, contactors, charging guns, etc.
This example is a dual gun 120kW DC charging station. The intelligent switching unit controls the charging module, the DC meter measures current, the insulation monitor measures insulation voltage and insulation resistance, and the insulation monitoring is controlled by the controller. When the charging station is in use and charging gun A or B is used separately, the controller sends a command to control the corresponding IMD 1 or IMD2 insulation monitoring instrument to perform insulation monitoring; When charging guns A and B are used simultaneously, the controller sends a command to control IMD 1 insulation monitoring device to perform insulation monitoring. By coordinating the operation of the controller and insulation monitoring device, the safety, stability, and reliability of the DC charging system are ensured.
Application of Energy Storage Insulation Monitoring
There are mainly two types of insulation monitoring schemes for energy storage: external insulation monitoring instrument scheme and internal insulation monitoring instrument scheme. Ankerui insulation monitoring instrument is applied in external solutions, which are fixed and highly replicable.
There are many foreign energy storage projects that use external insulation monitoring devices, and AIM-D100-TS can be used. Some projects require insulation monitoring devices to meet IEC standard requirements, and AIM-D5000-CA and ACPD300 can be used.
6、 Insulation Monitoring Case of DC System
Ankerui Electric provides solutions ranging from internal monitoring instruments to charging station management platforms. Among them, insulation monitoring devices are installed inside the DC charging piles to perform insulation testing on the charging lines.
A certain battery company has been working on a commercial energy storage project, and in the project plan, the insulation monitoring product of the energy storage DC system has been highly regarded as an important part of electrical safety.
7、 Product certificate
