[!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.

[!WARNING]
Re-using the iX batteries require opening the battery to change internal wiring for contactors. To do this safely, the correct personal protective equipment (PPE) is required. When handling the inside of a BMW iX battery, please make sure you check your local electrical safety legislation requirements.

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.

Here is a list of all different BMW iX batteries, and their specifications / voltage ranges

Technical data	SE10	SE11	SE12	SE13	SE16	SE26	SE27	SE30	SE50
Vehicles	iX	iX	iX1	iX1, iX2	iX3	i4	i4, i5	i7	iX
Number of battery cells (lithium-ion battery)	500	180	156		188	288	324	408	450
Chemistry	NCA		NMC		NMC	NMC	NCA	NCA	NCA
Configuration	100s5p	90s2p	78s2p		94s2p	96s3p	108s3p	102s4p	90s5p
Number of cell modules	5 cell modules (8s5p) 6 cell modules (10s5p)	10 cell modules (9s2p)			8 cell modules with 18 battery cells 2 cell modules with 22 battery cells	4 dual-cell modules (two 12s3p)	3 cell modules (4s3p) 4 dual-cell modules (two 12s3p)
Nominal Voltage	368 V	330.3 V	286.3 V		345 V	354 V	398.5 V
Voltage range	Min. 280 V - max. 430 V	Min. 252 V - max. 378 V	Min. 218.4 V - max 327.6 V		Min. 263.8 V - max. 394.8 V	Min. 268.8 V - max. 408 V	Min. 302 V - max. 464 V	Min. 285.6 V	Min. 252.0 V
Battery capacity	303.0 Ah	232.0 Ah	232.0 Ah		232.0 Ah	198.6 Ah	210.6 Ah	280.8 Ah	303.0 Ah
Capacity per cell	60.6 Ah	116.0 Ah	116.0 Ah		116.0 Ah	66.2 Ah	70.2 Ah	70.2 Ah	60.6 Ah
Max. storable energy quantity	111.5 kWh	76.6 kWh	66.45 kWh		80 kWh	70.27 kWh	83.9 kWh	105.7 kWh	100.35 kWh
Max. useful energy quantity	106.3 kWh	70.6 kWh			73.8 kWh	68 kWh	80.7 kWh	101.7 kWh
Dimensions of the housing (length x width x height)	2410 mm x 1742 mm x 141 (303) mm	2410 mm x 1742 mm x 141 (303) mm			2228 mm x 1586 mm x 311 mm	2261 mm x 1708 mm x 285 mm	2261 mm x 1708 mm x 285 mm
Total weight	649 kg	521 kg	436 kg		518 kg	500.9 kg	564.5 kg
Cooling system	Coolant	Coolant	Coolant	Coolant	Coolant	Coolant	Coolant	Coolant	Coolant

SE11 battery being transported on a trailer

Software configuration

For this battery type, use the option called "BMW iX and i4-7 platform" under the "Battery Protocol" setting

Also remember to configure the allowed charging power, since we do not read this value via CAN.

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 LilyGo T-2CAN, plus a CAN-FD chip add-on.

Alternatively, if you want to make it even easier, get the Stark CMR hardware which has built in support for CAN-FD. This is the recommended path!

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.

If you are having trouble sourcing the Hirschmann connector, a cheap alternative can be found on Aliexpress. Purchase Link . IMPORTANT SIDE NOTE: its available in 2 different types. The difference is the locating pin. Be sure to order the one with the locating pin on the 8-16 side, and not on the 1-9 side.

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

Since the integration has not figured out how to close contactors,we let the Battery-Emulator take control over the contactors instead.

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!