Dacia Spring / Renault K-ZE ( CMFA-EV platform )

The Dacia Spring Electric (27.4kWh) / Renault K-ZE (26.8kWh), are both vehicles in the CMFA-EV platform.

There are also a fewChinese EVs that also share the same CMFA-EV battery platform, all the following models are compatible with the Battery-Emulator integration:

• Dacia Spring Electric (2021–present)
• Renault City K-ZE (2019–present)
• Dongfeng Aeolus EX1 (2019–2021)
• Dongfeng Fengxing T1 (2019–2021)
• Dongfeng Fengguang E1 (2019–2024)
• Dongfeng Nano Box (2022–2024)
• Venucia e30 (2019–2023)

These batteries have 72 cells in series, which creates an operating voltage of approximately 216 to 302VDC. Make sure the inverter you are planning to use is compatible with this voltage range!

Wiring diagram, Low Voltage

The battery contains a terminating resistor. The LV connector on the battery has the following pinout:

The pin numbering is engraved on the LV connector (PT06A-12-10S)

Try to source at least the LV connector; scrapers are happy to cut the cables and usually give them for free. Get the HV connector too. Makes things look nicer.

Connect the battery to the Battery-Emulator according to this diagram:

12V power info: The preacharge+contactors consume 1.5A. The BMS itself uses 0.1A

Wiring, High voltage

The battery has a service disconnect switch:

Note that there are two versions of the service disconnect switch. The 2021 model is different to 2022+. So, if you purchase a service disconnect switch, make sure you get the correct model year!

The polarity of the High Voltage outputs can be seen here, Left is positive, Right is negative. Part number for HV connector is: 297A21306R.

Compiling the software

Enable the CMFA_EV_BATTERY option in USER_SETTINGS.h

Spring keeps the HV voltage between 218V (0% SOC) and 304V (100% SOC) You can adjust SOC min percentage and SOC max percentage from the emulator settings to keep the battery voltage somewhere in the above voltage range. Like -5 / 85 with current build (june 2025)

If you see strange cell imbalance or HV voltages - reset the BMS: Pause charge/discharge, open contactors, cut 12V to the battery for ~30sec, then apply 12V again, close contactors, resume charge/discharge. Might need to reset the emulator

Completed builds:

DIY wooden support, with space for the fuse underneath