Making a custom battery pack for MiEV

paulsernine · Monday at 10:27 AM

Good point !

And what about the fact the battery is fliped 90º ? Is there some vent on the top side which could be affected ?

kiev · Monday at 10:47 AM

Cells are sealed--there is no open vent to atmosphere.

Except in the event of an over-pressure, then a vent will be provided to you

If you are willing to do some plastic milling, then the pockets in the bottom of the pack housing could be opened up. But 40mm is quite a chunk to remove.

And the module-to-module buss bars may need some adjustment for length.

i wonder if the cell terminals can be drilled and tapped for bolts to connect the jumper bars? Or are they weld-only using aluminum buss bars?

AsCzero · Tuesday at 3:40 PM

MickeyS70 said:
An very interesting solution (literally thinking outside the box) from one of the members on the German forum, rather than trying to fit the replacement cells into the existing module, he strapped bigger cells together so they fit snuggly into the battery frame (picture quality isn’t great but you get the idea).

Not much details (yet) on the cells used, but they are 114Ah 3.7V and apparently just 23$/per cell (+ shipping)

https://www.goingelectric.de/forum/viewtopic.php?t=94422&start=70

Hello all.
Also thinking out of box, 4(Four) CATL pack 24s1p 88.8V 114Ah could fit inside the battery box,
For the correct car's voltage, and much Higher battery capacity. Need of rearranging the acessories inside. Beeing these packs flat aluminum boxes, with flat surfaces, ideal for a much more efective heatpipe assisted battery cooling.

MickeyS70 · Tuesday at 5:32 PM

AsCzero said:
Also thinking out of box, 4(Four) CATL pack 24s1p 88.8V 114Ah could fit inside the battery box, For the correct car's voltage, and much Higher battery capacity.

These seem to be the same cells as our German friend is using

AsCzero said:
Need of rearranging the acessories inside.

That’s the difficult part..

AsCzero said:
Beeing these packs flat aluminum boxes, with flat surfaces, ideal for a much more efective heatpipe assisted battery cooling.

Certainly a benefit, but it will create it’s own challenges, e.g. how are you going to connect the CMUs?

IMHO CATL93 cells are currently best suited as LEV50x replacements as they fit into the module cases with minimal modifications.

But if one can find a easy way fit, connect and secure 8 (4) CATL114-blocks with stock CMUs into the battery cage, then ‘thinking outside the box’ could be 50% cheaper per kWh than using CATL93…

Making a custom battery pack for MiEV

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