Li ion battery packs with BMS

Question

Li ion battery packs with BMS

Hans NC (Mechanical)

(OP)

3 Apr 19 19:59

Hi

I am to assemble Li Ion battery packs to power my boat motor. I have found batteries (Samsung 30Q, 3000mAh), racks and nickel strips for assemble. However I have difficulties finding a proper BMS system.

My plan was to make 5 modules of 12S10P , giving me approx 48V at 30Ah for each module. Then wire the 5 modules together in parallel and get 150Ah in total. Each module would than have 12S10P BMS for at least 30Ah. But the supplyer could not recommend this setup.

My mayor is mechanical engineering. I did a lot of research on battery packs but still missing out on the BMS.

What sort of BMS system am I looking for?

racookpe1978 (Nuclear) · Answer 1 · 2019-04-04 13:13:41

Recharge via solar long term, or by plugging into the dock? Or will the boat be left under tarp and be covered up out of the water on a trailer between trips?

Hans NC (Mechanical) · Answer 2 · 2019-04-10 19:38:30

Plan is to charge when in dock. However solar panels are plans for the future ;)

IRstuff (Aerospace) · Answer 3 · 2019-04-10 22:11:54

What are the power input requirements for the motor itself?

Do these need to be individually balanced during charging?

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Hans NC (Mechanical) · Answer 4 · 2019-04-11 19:21:40

Motor input should be 48V and it can deliver 9kW.

I do not know. I planned to connect the 5 packs in parallel and charge them all together.

IRstuff (Aerospace) · Answer 5 · 2019-04-11 23:46:44

So how are you going to deliver 187.5A (= 9kW/48V) with only 150A (5*30A) of supply?

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Hans NC (Mechanical) · Answer 6 · 2019-04-12 06:03:29

Batteries I intended to use is Samsung 30Q Li Ion 18650 batteri. Each battery is 3.7V, capacity of 3Ah and CDR (continuous discharge rates) of 15A. Which gives my 5x 10series enough to power the motor.

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Li ion battery packs with BMS