EMUS BMS with small sensors for pouch cells

[vile]

Hello all,

I'd like to know if anyone has build a batterypack of pouch cells (for example the A123 20Ah cells) using the EMUS BMS with the small sensors.
I would like to know how you wired and mounted the sensors.

The sensors look like this:

The board can be cut if the screw hole is not needed.

I'm planning to build 28s1p packs, but I don't know where to put the cellsensors. They are designed to be mounted with a screw to the cell, but the pouch cells are only 7.2mm thin, so the sensors have to be mounted on the side of the cells or on top of them if there was a piece of plexilas as insulator.

What are your ideas and how have you solved this? I haven't found any information/pictures...
Best regards
Vile

 

[circuit]

Hello Vile,

It is possible to mount these modules on wires, as shown in you second picture. For example you could simply heatshrink it and connect to your cell-connecting busbars. But those wires (negative one especially) should be kept short.
One more thing to note is power dissipation. These small modules shunt at current ~1 amp and have to rely on thermal sinking into massive cell terminal. If you mount them on wires, thermal sinking, obviously, will be not fast enough and you might start hitting thermal protection. This can be easily solved by lowering shunting current in the software (for example set it to 10%).

More information is available on manufacturer's website:
http://elektromotus.lt/en/products/battery-management-system-bms
http://elektromotus.lt/wiki/index.php?title=BMS:_Quick_Start_Guide_v2.x
http://elektromotus.lt/wiki/index.php?title=BMS:_Downloads&Itemid=151

And this is closer look:

Module can be shortened and attached with 3mm machine screws of with another wire. It is 18mm wide and ~2.2mm thick.

 

[Ypedal]

(VAT not included)
EMUS BMS Control Unit - 289 Euro
EMUS BMS Cell Module - 13.99 Euro


$$$$$$

 

[circuit]

Yup, it is pricey, especially for small (ebike) applications. But it is one of best solutions for large packs and industry.

BTW, in tight environments, or where specific integration in required, these modules may be a good solution:

Simply make your own PCB with shunt resistors and solder these on... I have a datasheet somewhere.

 

[circuit]

vile,

I have found a few pictures of similar pack build with "small" Emus BMS Cell modules. Here it is:

 

[piwhy]

Hi Vile,
I didn't seen your post before, but if you're still looking for informations on EMUS BMS modules used on pouch cells ; please find some pictures of one my EMUS system which works perfectly on a 32sp3 A123 battery pack.
PY