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Nissan Leaf BMS wiring differences between 2013 24kWh vs 2018 40kWh

3814 Views 18 Replies 8 Participants Last post by  hfraza
I'm trying to find out if the wiring, connectors, and pinouts between the 2013 and 2018 BMS to battery modules are different or the same. I haven't found any pin diagrams for to the BMS anywhere so if anyone has a source I'd be happy to know.

For context, I'm planning to replace the 2013 24kw modules with 40kw modules. From what I understand this method is call a bruteforce upgrade. There shouldn't be any controller issue as I'm using the Resolve-EV controller but my research thus far suggests issues with the BMS not recognizing 40kw thus not reporting the correct capacity not being able to charge it fully.

So this means I'll be also upgrading the BMS from 2013 to 2018 but that leaves open a question whether the wiring has changed or not. From a glance, the connectors look the same but the pin out on the connectors is unknown.

If anyone has a 40kwh battery and has a pin map for the connectors, that should help.

In case someone comes across this thread again, I documented my solution here:
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If only all of these posts and information was available when I ordered my battery modules here in nz. I've put 40kwh modules in my 2013 leaf. It fully charges and discharges it correctly it just can't calculate the correct capacity so it still gets 100 odd kms after the bms thinks it's empty. If I monitor pack voltage on leafspy I can see more or less where the soc is sitting...
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Yeah like you say it's hard to get a full 40kwh pack, especially in new zealand. For anyone needing it, there's a company here in nz that sells a battery translator that means you can fit a full 40kwh ze1 battery and it translates the back so Soc and soh are both correct on the dash.

Yeah I replaced all the modules and it fully charges and discharges correctly its just a bit confused on the dash. Charges to 396v and discharges to 290v when turtle mode and cut out happens. I got 220kms and mostly 100-110kmh roads. I know my speedo is 5kms and 5% out so probability closer to 200kms in the real world but close enough.
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As an update to what I did it turns out the computer is smart and dumb. It re learnt and now limited itself to using only 24kwhs. Interesting it's guess o meter thinks it's got 150kms range when charged up 😄
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