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

3829 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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I'm trying to understand this all, piecing together a few bits. I'm planning to upgrade a Leaf pack, either in my Miata1EV project or future truck project. It sounds like a complete 40kWh pack would work fine, but if I need to source the modules separately and reuse the 24kWh wiring and control components, there may be some challenges...

These challenges might be resolved with:
  • New BMS and Current Sensor from 40kWh pack (aka BruteForce), or
  • Possibly a NZ company that can translate battery info (assuming on CAN). I assume this is similar to other CAN bridges (like Dala's) (aka Clean)

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