Hey, am Thigiru. I decided to experiment various approaches of designing one of my old cars into electric.
I started by first designing a metallic box that would fit well on the car's under hood.
I made 20 cells in parallel and made those stacks to form 30 series terminals. the total voltage for the bank was 126 volts.
I used super 2, 500 farad super capacitors for lithium ion balancing. I used 12 volts relays which were run from a cd4017 decade counter. The super capacitors ensured that my li-ion batteries had a balanced voltage at all times.
My power bank was about 12kw in capacity and looked a little complex with many wires inside.