Test bed for a future electric motorcycle

[Arimhan]

Hi,

i'm currently building a kind of e bike/ motorcycle.
It will be cheap, underpowered and not really practical because it's just a test bed before I move on to a full blown motorcycle.

It's going to be a middrive using a cheap flipsky motor and 4P10S Sanyo 2000mAh battery and a kelly controller.
I'm going with an overkill setup with a BMS bypass like I will on the full size motorcycle.
I live in Europe so to be street legal It needs to have a top speed of less than 25km/h and pedal assists so it won't be officially street legal.

The first draft of the schematic is :

I'm already planning some change by removing on of the contactor.
I know this is not an interesting build but the next one will be better and i'm planning to to an open source on board computer with gps navigation.

 

[Arimhan]

I'm planning on using copper for the battery connection and my first test with a copper nickel sandwich is fine with my malectrics welder but my electrode are getting welded to the nickel too and it's destroying them a bit.
Would tungsten electrode help?



This is the battery with a dry fit test of the bus bar.
It's 0.1mm copper sandwiched by 0.15mm nickel for soldering help.