Clear Definition
EVCC, or Electric Vehicle Communication Controller, is the communication controller installed on the electric vehicle side. It communicates with the SECC inside the charging station and sends the vehicle’s charging requirements to the charger.
In DC fast charging, the EVCC works together with the BMS to report battery voltage, current demand, charging limits, battery status, and charging stop conditions.
Simply speaking, EVCC is the “communication brain” of the electric vehicle during charging.
Application Scenarios
EVCC is mainly used in:
Application Description
Electric vehicles Communicates with DC fast chargers
Electric buses Supports high-power CCS charging
Electric trucks Used in commercial EV charging systems
Energy storage vehicles Supports DC charging and discharging logic
Vehicle development testing Used for EV charging protocol validation
Technical Flow
A typical EVCC charging flow includes:
EV detects connector insertion.
EVCC wakes up and checks charging interface status.
EVCC starts PLC communication with SECC.
EVCC sends supported protocol information.
EVCC exchanges charging parameters with SECC.
BMS provides battery voltage, current, SOC, and limits.
EVCC requests pre-charge and charging start.
EVCC continuously updates charging demand.
EVCC sends stop request when charging is complete or interrupted.
Product Relationship Diagram
EV Battery
|
v
BMS
|
v
EVCC
|
| PLC / ISO 15118 / DIN 70121
v
SECC
|
v
Charging Station Power System
Standard Protocol Explanation
EVCC normally works with these standards:
Standard EVCC Function
ISO 15118-2 EV-to-EVSE communication, Plug & Charge support
ISO 15118-20 Advanced V2G and bidirectional charging communication
DIN SPEC 70121 Basic CCS DC charging communication
IEC 61851 Basic CP / PP signal interaction
CCS1 / CCS2 Physical connector and charging interface system
EVCC vs SECC
Item EVCC SECC
Installed side Electric vehicle Charging station
Main role Sends vehicle charging demand Controls charger-side communication
Works with BMS, vehicle controller EVSE controller, power module
Protocol ISO 15118 / DIN 70121 ISO 15118 / DIN 70121
Typical user EV manufacturer Charging station manufacturer
FAQ
Q1: Is EVCC required for DC fast charging?
Yes. In CCS DC charging, the vehicle needs an EVCC to communicate with the charging station.
Q2: Is EVCC connected to the BMS?
Yes. EVCC usually receives battery information from the BMS and sends charging requirements to the charging station.
Q3: Can one EVCC support both CCS1 and CCS2?
The communication logic can be similar, but connector type, market requirements, and system design must be confirmed.
Share Charging Project Capability
Share Charging can support EVCC-related projects for vehicle-side CCS charging development, especially for customers developing electric vehicles, mobile charging vehicles, energy storage charging products, or vehicle charging simulation systems.
Our support can include:
EVCC hardware selection
CCS communication matching
BMS communication adaptation
Charging test process design
Vehicle-side charging logic consultation
EVCC and SECC interoperability testing support
