Connecting identical packs in parallel with a single BMS

Batteries, Chargers, and Battery Management Systems.
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theabsurdman   1 mW

1 mW
Posts: 12
Joined: Jul 15 2022 6:22pm

Connecting identical packs in parallel with a single BMS

Post by theabsurdman » Nov 24 2022 6:48am

Hi,
I want to connect 3 identical 6P packs' parallel strings together side-by-side to operate as a larger pack off a single BMS - 2 questions:

1/ would it be sufficient to make the nickel strip connections between packs, illustrated by red lines in the pic below, to just 4 cells out of each 6? Am I right in assuming that the current requirement would be max pack amps divided by the number of cells in each parallel group?

2/ what would be the implications of recruiting cojoined cells into a parallel group using a single cable connection rather than using nickel strips?

Thanks in advance.
IMG_20221124_105626.jpg
IMG_20221124_105626.jpg (1.57 MiB) Viewed 62 times

theabsurdman   1 mW

1 mW
Posts: 12
Joined: Jul 15 2022 6:22pm

Re: Connecting identical packs in parallel with a single BMS

Post by theabsurdman » Nov 24 2022 12:01pm

Anybody?

To clarify what I'm trying to achieve. I have 3x 10S6P li-ion packs that I want to make into 1x 10S18P pack running off a single BMS. So I have to connect the 10 parallel groups of each pack together. The problem is how to achieve that efficiently.

I was also considering converting the 10S pack to a 7S, redistributing cells from the 3 disconnected strings back to the 7 active strings with cables.

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