Overall architecture of charging pile communication module: collaborative working mechanism of SECC, EVCC and OCPP

The charging pile communication module is the core communication hub of the new energy vehicle charging system. It is responsible for connecting the entire data interaction between the vehicle, the charging pile, and the cloud. It is the basic hardware support for achieving charging safety, protocol compatibility, intelligent operation and maintenance, and global interconnection.

The entire communication system is composed of three core components: the vehicle-side EVCC , the charging pile-side SECC controller , and the cloud-based OCPP module . It is widely used in all types of equipment, including IEC charging piles , ISO 15118 charging piles , charging pantographs, and charging piles with cameras. It also supports bidirectional compatibility between national and overseas standards, serving as a key technological foundation for charging piles going global and car companies going global.

Positioning of the Three Core Components of the Charging Pile Communication Module

EVCC (Vehicle-to-Vehicle Charging Communication Controller)

• Location: Vehicle-mounted, integrated inside the vehicle's charging port.

• Role: Vehicle-side communication entry point, working in conjunction with BMS

• Core responsibilities: Conversion between Chinese and international charging protocols, interfacing with SECC controllers for identity authentication, power negotiation, and safety protection.

• Compatible scenarios: European standard charging stations, ISO 15118 charging stations, and automatic charging via pantograph.

SECC Controller (Charging Communication Controller at Charging Station)

• Location: Inside the charging station, it belongs to the core unit of the European standard charging station control board.

• Role: Pile-side communication hub

• Core responsibilities: PLC/CAN protocol conversion, ISO 15118 standard interface, execution of charging commands, and ensuring communication security.

• Compatible scenarios: European standard/American standard/Japanese standard charging piles, DC charging piles, AC charging piles, pantographs

OCPP module (Open Charging Point Protocol module)

• Location: Pile-end networking unit

• Role: Pile - Cloud Communication Gateway

• Core responsibilities: Integrating with the OCPP operation platform, remote monitoring, intelligent scheduling, data reporting, and OTA upgrades.

• Suitable scenarios: global charging operation network, overseas compliance requirements

Three-tier collaborative workflow of EVCC, SECC, and OCPP

The complete working logic of the charging pile communication module operates in a three-layer collaborative manner: " vehicle-charging pile near-field communication → pile-end control execution → cloud-based operation management ".

First layer: Vehicle-to-charger handshake (EVCC ↔ SECC controller)

1. Vehicle plugging in or driving into the charging pantograph area

2. EVCC sends vehicle identification, charging capability, and battery status information.

3. SECC controllers can parse Chinese national standards, European standards, and American standards, and have completed ISO 15118 safety certification.

4. Two-way negotiation of voltage, current, power, and charging mode

5. After confirming everything is correct, start charging → This step determines whether charging can start, is safe enough, and is compatible with standards .

Second layer: In-pile control (SECC controller dominant)

1. The SECC controller monitors voltage, current, temperature, insulation, and leakage current in real time.

2. Immediately cut off the output in case of an abnormality to ensure safety.

3. Supports dual communication via PLC and WIFI, compatible with pantograph charging and ISO 15118 charging stations.

4. Complete the protocol conversion between the Chinese national standard GB/T 27930 and the European standard DIN70121 and the international standard ISO 15118 → This layer determines whether the charging is stable, reliable, and suitable for overseas use .

Third layer: Cloud operation (OCPP ↔ OCPP operation platform)

1. The OCPP module uploads charging status, fault information, battery level, and order data to the cloud.

2. The operation platform issues remote start/stop, parameter configuration, and firmware upgrade commands.

3. Achieve intelligent load balancing, off-peak charging, and V2G scheduling.

4. Supports uploading charging pile video and license plate recognition data with cameras to the cloud → This layer determines whether the equipment is operable, manageable, and commercializable.

Deep Integration of Charging Pile Communication Module with ISO 15118 Charging Pile Standard

ISO 15118 is the core global standard for smart charging, and its implementation requires a complete charging pile communication module.

1. The EVCC and SECC controllers complete encrypted authentication via PLC, enabling plug-and-charge functionality.

2. Encrypted transmission of communication data to prevent unauthorized use and attacks.

3. Supports bidirectional energy exchange via V2G, V2H, and V2L.

4. OCPP will simultaneously upload ISO 15118 charging data to the OCPP operating platform to achieve compliance and traceability.

In short, an ISO 15118 charging station consists of charging hardware and a complete charging station communication module.

Application of charging pile communication modules in European standard charging piles and pantographs

European standard charging pile and European standard charging pile control board

• The SECC controller is the core of the European standard charging pile control board.

• Responsible for the protocol conversion, enabling domestically produced piles to directly enter the European market.

• Meeting the mandatory access requirements of European platforms when paired with OCPP

• Pair with vehicle EVCC to achieve full-scenario compatibility

Automatic charging via OppCharge

• The vehicle-mounted EVCC uses Wi-Fi wireless communication to achieve automatic vehicle-charging station matching.

• The SECC controller at the pile end is responsible for the safety control of pantograph descent and prevents accidental pantograph descent.

• OCPP enables remote operation and maintenance and order management of unmanned stations.

• The entire charging pile communication module supports 480kW high-power automatic charging.

Charging stations with built-in cameras

• Cameras identify license plates and user identities

• The signal is sent to the SECC controller to start charging.

• Videos and alarms are uploaded to the cloud via OCPP.

• Achieve seamless charging, security monitoring, and space management in one integrated system.

Core Technological Value of Charging Pile Communication Module

A single EVCC+SECC system can cover Chinese, European, American, and Japanese standards, and is compatible with European standard charging piles and ISO 15118 charging piles worldwide.

Going global with low cost and quick deployment requires no redevelopment of the entire vehicle/charging infrastructure, and can quickly obtain CE, RoHS, and CQC certifications.

The all-scenario intelligent charging system supports gun chargers, pantograph chargers, unmanned charging, charging piles with cameras, and various scenarios including home, commercial, and heavy-duty trucks.

The cloud-based, high-efficiency operation and maintenance OCPP platform enables remote upgrades, fault diagnosis, and intelligent scheduling, significantly reducing operation and maintenance costs.

Overall Architecture Summary

The charging pile communication module is a complete communication system composed of EVCC, SECC controller, and OCPP :

• EVCC vehicle-side communication

• SECC pipe pile side communication

• OCPP pipe cloud communication

Working together, these three components support safe, intelligent, and interconnected global charging services for European standard charging piles , ISO 15118 charging piles , pantographs, and charging piles with cameras. They form an irreplaceable "neural network" for modern charging systems.