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Instead of separate port BMSs, use 2 BMSs one for charge and one for discharge.

John Frum

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Nov 30, 2019
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Another iterative idea on multiple BMSs

Over the last ~year I started exploring multiple batteries in parallel each with its own BMS.
Then I thought about having multiple BMSs on one battery to increase current capacity.

The penultimate iteration is...
One BMS for charge and the other for discharge.

In the simple case the charge source{s} current goes through one BMS and the load{s} go through the other.
The benefit is a trip on one BMS doesn't effect the other.
The drawback is more complexity and expense.

The latest iteration is...

Each BMS controls an SSR which remote controls its respective load{s} or source{s}.

The benefits are the same as above but with huge scalability.
The drawback is even more complexity and expense.

I've been wanting a BMS that doesn't use FETs or contactors and is scalable and inexpensive.
I suspect nobody will actually make one because its too scalable and makes it hard to stratify a product line.
 
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i think using a separate bms for charging and discharging is totally valid and interesting use case

it might not win the prize for ultimate lowest cost, but i still think it’s interesting
 
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