BMW BMS modules

[FFMan]

I think one of the BMS modules on 330e pack has died. Seemed to have got wet when the cabin heater sprung a leak.

These appear to be individually numbered with a TZ number, and they are all different. Is this related to a can id or similar ?

If i replace a module do i have to code it in, or try and get the same number module ?

thanks

[andybpowell]

I'm pretty sure in the early version they are all canbus and identical, in the later version the first one is the master but the other 4/5 are identical
they are also like hen's teeth

[tom91]

The Gen1 can be recoded, SimpBMS coding handily provides this functionality.

If it is a second gen slave i do not know how the numbering works, you might be luckily and it is just a daisy chain and the modules are not "really numbered" just are in an order.

[andybpowell]

From what I have read of the BMW documentation it's purely down to the position in the chain

[FFMan]

ok good - i think i'll try a module from the rear pack. This will prove if its positional or if they need coding etc

[tom91]

ok good - i think i'll try a module from the rear pack. This will prove if its positional or if they need coding etc

Are they the same generation? your signature says 9kwh and 12kwh, if they are both 6 modules packs they are Gen 1 and Gen 2 so not interchangeable slave modules.

[FFMan]

interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.

is that expected between gen1 & gen2 ?

[andybpowell]

interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.

is that expected between gen1 & gen2 ?

do you have a picture of one ?

[andybpowell]

interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.

is that expected between gen1 & gen2 ?

gen1 and 2 look very similar gen 2 are thinner on the outside edges and the master will be a differant colour mine is white
but thinking about it if they are all the same according to you, only gen 1 was available in both the 9 and 12 kwh packs, gen2 were introduced after they switched to the 2kwh modules so they must be all gen1 and so interchangeable but will need recoding from within the simp bms menu

[tom91]

interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.

is that expected between gen1 & gen2 ?

Mentioned in different threads but will do again.

Gen1: All slaves the same
Gen2: Only the MasterSlave talks CAN, it then talks some form of ISO SPI to the other slaves. It is a different colour.

The pack internal CAN is the same, the MasterSlave spits out all frames for all slaves as it just gathers all the info.

[FFMan]

do you have a picture of one ?

it's a close up of the info panel - best i have to hand

[FFMan]

Mentioned in different threads but will do again.

Gen1: All slaves the same
Gen2: Only the MasterSlave talks CAN, it then talks some form of ISO SPI to the other slaves. It is a different colour.

The pack internal CAN is the same, the MasterSlave spits out all frames for all slaves as it just gathers all the info.

ok - all my slave units are black so gen1, but sounds like if i swap them in/out i'll need to renumber which i can do in simpbms ?

[andybpowell]

Yep

[tom91]

Yes SimpBMS can do this.

Did you get the Gen 2 modules separate from the BMS Slaves?

[FFMan]

Yes SimpBMS can do this.

Did you get the Gen 2 modules separate from the BMS Slaves?

i'm not aware i have any gen 2 modules. i think both myu packs are gen1, and all the modules are black and original to the packs

[royhen99]

From photos here viewtopic.php?p=61468#p61468 your rear pack is gen2. Gold coloured covers on modules and white cmc on the module marked "6".

[andybpowell]

Yea you really need to decide if they are all black or not as shown in the picture, I'd hope BMW would have keyed the connectors so they are not interchangeable but you never know and plugging the wrong modules in could prove costly

[andybpowell]

I'm guessing from the picture you supplied earlier that you have gen1 on the 1.5kwh modules since it's dated 2017 and gen 2 on the 2kwh

[ted.walsh]

I have a couple of sets of the G1 26ah cell and the G2 34ah cell packs, the wiring looks similar between the two brick types but is bump polarized on the connector to stop plugging in an inappropriate module either way, I dare say you can remove the connector shell as this is easy to do, but I didn't need to and just took it that the are different enough not to mix. essentially without a lot of buggering about they are chalk and cheese.
Also be on the lookout for bricks with a RED connector, these are 8s2p configuration, black appears to be 16s

[FFMan]

thanks

I have a gen1 pack up front and a gen2 pack in the rear. The BMS is different but responds to same can commands which is useful