Info on BMW hybrid battery packs?

[bobby_come_lately]

If savvy can is on the bus with the modules and the BMS which ids are present? all modules broadcast a "status" regardless if they are being requested by the BMS.

There is a possibility you messed up you CAN wiring. lacking termination resistor could be an issue it does not have to be.

The modules are completely silent, so that's worrying.

Possible I messed up the canbus wiring but it's the original BMW loom that was working before the experiment, so I'm not sure how. I've been through it all and tested for continuity and shorts.

Failure of the 5V supply or ground would be the obvious answer but fairly confident I've ruled that out. I'm going to check again though because that's the only thing that really makes sense to me.

[tom91]

Failure of the 5V supply or ground would be the obvious answer but fairly confident I've ruled that out. I'm going to check again though because that's the only thing that really makes sense to me.

Battery open and checking each one by one is the only way then. Buzzing it through to ensure continuity. I have witnessed them fail by being supplied 12V instead of 5V have not had any fail or heard of any beyond that.

[bobby_come_lately]

Pulled open one of the CSCs and did a continuity test for CAN H/L, 5V and GND between there are the BMS. All coming through fine. 120 ohm between H and L.

They've definitely not had 12V.

There's probably a really stupid explanation that I'm missing but stumped if I know what it is.

Thanks for your help.

[tom91]

Very strange. I would start moving the CSCs about to see if the one that is working is the only one that works on that module.

I would be surprised if they just died as they are also coated pcbs, and one of them still works. 4/5 failure at the same time would be unexpected.

You have a bench test pack right? I would get that working so you can see a few or all modules, then swap some CSCs in and out.

[bobby_come_lately]

It's the bench pack I'm working on. One in the car seems fine. And as far as I can tell, none of the ones on the bench is working. It's really weird. Like I say, I'm probably doing something really stupid but I can't work out what it is.

[andybpowell]

If they're all dead which seems unlikely let me know I can help you out

[ted.walsh]

There are enough people out there using these modules and lots of speculation on what they are capable of but little real world data
I'm running at
3.2v min
4.1 max
200A continuous

in recent drag race style running i operated with a 2P 34ah pair of packs on
max 4.2
min 2.8 - this was a bit mute though cos below 3.5 the performance dropped sharply
due to mains power operational restrictions I was limited to 3kw of charging essentially charging each brick in the pack to 67.3v @ 15a. the temp rose just 2 degrees
in testing I tried running just a single pack (34ah 82kwh rated) to feed the leaf 160kw EM57, it didnt work well and lacked any kind of wallop. in under 5 mins/ 2miles of running though it took the pack temp to 66 Celsius. it didnt blow up or catch fire. I waited until it had cooled to 30c before putting any charge in.
In later runs I used 2 full packs in parallel, it performed much better. I still managed to take both packs below the 340v 'knee' in under 5 miles of flatout pedal hard down (100%) running. the pack temp in these cases rose to approx 35c. again I let them cool to 30c before charging.
both packs have the 'gubbins' for the BMW cooling/heating system but no gas as I dont have all the bits yet to complete the HVAC system. I am considering just cooling them with glycol or dilectric fluid (just in case it leaks) if anyone has any views on that?

[Stopdrpnro]

What would be involved in retrofitting this pack into ann existing hybrid? Seems like this pack could really transform a prius.

[tom91]

What would be involved in retrofitting this pack into ann existing hybrid? Seems like this pack could really transform a prius.

This is very dependant on what the vehicle expects. Most likely you need a new BMS master that then takes the information from the modules, measures current, controls contactors and then talks to the vehicle.

[RealNail]

Couple of days ago disassembled the high voltage battery of BMW225xe.

[blik86]

Hi. Can you tell me what current is allowed to charge 34Ah cells at subzero temperatures? (-15°C)

[marcexec]

Hey 24 kWh battery hackers, I've tried adding the details to the Wiki:
https://openinverter.org/wiki/BMW_Hybri ... ifications
and
https://openinverter.org/wiki/Batteries#OEM_modules
@nkiernan, since you have it open (viewtopic.php?p=68794#p68794), can you confirm some of the measurements, especially the module weight?

[shubhashd]

Hi all, any ways to get hold of a 3D Cad model of this battery module?