[!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	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

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	Protective Cap for HV Battery 889520 - BMW (12-90-9-796-829)
1	CCU/AC Connector (100A fused)	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!