Battery: BMW iX, i4‐i7 (Gen5 platform) - dalathegreat/Battery-Emulator GitHub Wiki
[!CAUTION] Working with high voltage is dangerous. Always follow local laws and regulations regarding high voltage work. If you are unsure about the rules in your country, consult a licensed electrician for more information.
BMW Gen5 BEV Platform - (iX, i4, i5, i7)
BMW uses a shared modular platform across various vehicles with a common BMS (SME). BMW i4 for example has the SE26 or SE27 configuration.
Unlike i3, Gen5 now uses CAN-FD on the external side, and ISO-SPI between SME > Cell modules.
| Technical data | SE26 | SE27 |
|---|---|---|
| Number of battery cells (lithium-ion battery) | 288 | 324 |
| Number of cell modules | 4 dual-cell modules (two 12s3p) | 3 cell modules (4s3p) 4 dual-cell modules (two 12s3p) |
| Voltage range | Min. 268.8 V - max. 408 V | Min. 302 V - max. 464 V |
| Battery capacity | 198.6 Ah | 211 Ah |
| Max. storable energy quantity | 70.3 kWh | 83.9 kWh |
| Max. useful energy quantity | 68 kWh | 80.7 kWh |
| Dimensions of the housing (length x width x height) | 2261 mm x 1708 mm x 285 mm | 2261 mm x 1708 mm x 285 mm |
| Total weight | 500.9 kg | 561 kg |
| Cooling system | Coolant | Coolant |
Note on CAN-FD
The Gen5 BMW battery architecture uses CAN-FD, so if you plan on integrating this battery, you will need to get the CAN-FD chip add-on
Pin Assignments at Plug Connector A332*1B
A332*1B is the external low voltage connection. Connector is a Hirschmann 805-587-545 16way 1.2 SealStar FA Connector. Some packs have the LV connection at the front of the pack and appear to use a back to back connector instead.
| Pin | Type | Description / Signal Type | Connection / Measuring Information |
|---|---|---|---|
| 1 | E | Supply, terminal 30 | Fuse F242 Power distribution box, rear |
| 2 | M | Ground | Ground point |
| 3 | E | Terminal 30c signal | High-voltage safety connector |
| 4 | E/A | Wake-up signal | Body Domain Controller |
| 5 | -- | not used | |
| 6 | -- | not used | |
| 7 | E/A | High-voltage interlock loop signal (loop these two via 33ohm resistor) | High-voltage safety connector |
| 8 | E/A | High-voltage interlock loop signal (loop these two via 33ohm resistor) | High-voltage safety connector |
| 9 | E | Crash signal | Crash safety module |
| 10 | -- | not used | |
| 11 | E/A | CAN-FD Low | |
| 12 | E/A | CAN-FD High | |
| 13 | E/A | not used | (possibly alternate pins for CAN-FD on some variants) |
| 14 | E/A | not used | (possibly alternate pins for CAN-FD on some variants) |
| 15 | A | Activation | Coolant shutoff valve 2 |
| 16 | M | Ground | Coolant shutoff valve 2 |
HV Connectors
| Count | Connector | Cable/Cap |
|---|---|---|
| 1 | DC charge connector | Protective Cap Hv Battery 889520 - BMW (12-90-9-796-829) |
| 1 or 2 | main connectors | Rosenberger HVS420 - Protective Cap for HV Battery 889520 - BMW (12-90-9-796-829) |
| 1 | CCU/AC Connector (100A fused) | Hirschman HPS40-2 - Suitable cable is 5A2DB59-03 |
HV Connector Blank - 3D Printed
Here are some 3d printable covers for the large rear connector, smaller front connector and internal blanking covers for BMU (If you disconnect the additional HV outputs internally) https://www.thingiverse.com/thing:6845382/files
Pin Assignments on BMS Internal Connector
Pin Assignments on contactor connector (Inside BMS)
Example Wiring Diagram
This diagram assumes using manual contactor control (you will have to make up a 4 pin passthrough inside the battery from the SME/BMU to the spare pins on the external case). Pinout for the contactor connector is above. You can combine all 3 negative contactor connections, leaving the other 3 spare pins for the individual positives. 2WD and 4WD can vary for CANFD pinout - so check!
CANbus Map
Expected Vehicle Messages:
| ID | Rate | Sender | Length | Description / Signal Type | Comments | Sample |
|---|---|---|---|---|---|---|
| 0x125 | 10ms | CCU | 20 | CombinedChargerUnit10msNo2 | CAD450 | B1 04 7A D5 FE 7F FE 7F 0E 7E DE 9C 08 FF FF FF FF F0 FF FF |
| 0x16E | 20ms | CCU | 8 | CombinedChargerUnit20msNo1 | CAD454 | 85 A3 C9 FF 60 C9 22 F7 |
| 0x340 | 100ms | CCU | 12 | CombinedChargerUnit100msNo1 | CAD448 | AB 4E 6A FF 01 31 00 00 90 87 FF FF |
| 0x4F8 | ? | CCU | 24 | CAD454 | FF FD FF FF FF 80 31 C8 00 00 F0 40 FE FF FD FF 48 5A FF FF FF FF FF FF | |
| 0x91 | 10ms | EME | 48 | TractionEMachineElectronic1Time10msNo1 | CAD6D8 | 8D A3 58 B0 36 90 43 07 0C 06 87 80 FF FF 00 80 FE E7 7F FE E7 7F FE 17 FE 57 FF FF 00 11 01 FF 00 F0 01 10 00 E0 DF FF 02 20 00 FF 00 00 00 00 |
| 0xAA | 10ms | EME2 | TractionEMachineElectronic2Time10msNo1 | CAD6E4 | ||
| 0x188 | 5000ms | CCU | 8 | CAD4B8 | FD 03 21 00 3C FF FF FF | |
| 0x1EA | ? | KOMBI | 8 | Kilometers - Odometer | CAD7A5 - byte0-4LSB multiplier 0.001 | E8 AC 00 00 00 FF DF 48 |
| 0x2ED | ? | ? | 2 | Ambient Temp | CAD434 | 75 7F |
| 0x1FC | ? | ? | 8 | Heat management control | CAD720 | FF FF FF FC 00 00 C0 00 |
| 0x442 | ? | ? | 6 | Relative Time | CAD5F8 - byte 0-1 lsb time since starting car - seconds | 59 2F A9 00 E0 23 |
| 0x21D | ? | ? | 8 | Request - HVAC | CAD856 | 0A 03 7E FF FF FF FF C0 |
| 0x4EB | ? | ? | 8 | Status of RSU Condition | CAD808 | 3F A1 E5 FF FF FF FF FF |
| 0x276 | ? | BDC | 8 | Vehicle Condition | CAD498 | FF FF F0 FF FF FF FF FC |
| 0x1A1 | 200ms | DSC | ? | Vehicle speed HighVoltagePowerManagement200msNo1 | CAD4B0 | |
| 0x380 | ? | KOMBI? | 7 | VIN Last 7 Chars |