Battery: BMW iX, i4‐i7 (Gen5 platform)
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 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 |
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
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 | not all-wheel drive CAN-FD bus signal | Combined charging unit |
| 12 | E/A | 4WD CAN-FD bus signal | Electrical machine electronics 2 |
| 13 | E/A | not all-wheel drive CAN-FD bus signal | Combined charging unit |
| 14 | E/A | 4WD CAN-FD bus signal | Electrical machine electronics 2 |
| 15 | A | Activation | Coolant shutoff valve 2 |
| 16 | M | Ground | Coolant shutoff valve 2 |
| Count | Connector | Cable/Cap |
|---|---|---|
| 1 | DC charge connector | Protective Cap Hv Battery 889520 - BMW (12-90-9-796-829) |
| 1 or 2 | main connectors | Protective Cap for HV Battery 889520 - BMW (12-90-9-796-829) |
| 1 | CCU/AC Connector (100A fused) | Suitable cable is 5A2DB59-03 |
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
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!
