Pack Builder

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FiremanSam

New member
Joined
Oct 14, 2021
Messages
3
Hello. I would like to design my first battery from 18650 cells. My question relates to the Package Builder. I found out that Li-ion cells with different parameters should not be connected in series, but in the Package Builder such something happens because cells with different capacities can be connected in parallel and then in series for increasing the packet voltage. How is it actually? What are the limitations of such cell connections?
 

floydR

Member
Joined
Aug 23, 2017
Messages
1,314
Same chemistry, same voltage range, same format ( most will only use cells within a certain percentage of original capacity(SOH state of health) can be connected in parallel to increase the Ah of a battery then series to increase voltage. Often people will only use one brand in a build. if sourcing from laptop batteries it is hard to stick with one brand. I have heard of 300P banks which is huge. I moved to LiFePO4 for my builds for the most part.
Later floyd
 

FiremanSam

New member
Joined
Oct 14, 2021
Messages
3
Are there any rules regarding the differences in the capacity of cells connected in parallel, but also between sections connected in series?
 

Korishan

Moderator
Joined
Jan 7, 2017
Messages
6,552
Are there any rules regarding the differences in the capacity of cells connected in parallel, but also between sections connected in series?
Please refer to the FAQ to get a basic understanding of pack building, design, safety, capacity, language, etc.
 

OffGridInTheCity

Active member
Joined
Dec 15, 2018
Messages
1,746
Are there any rules regarding the differences in the capacity of cells connected in parallel, but also between sections connected in series?
If you have differing cells, you can use them - but the key in my opinion is to evenly distribute them among the packs in series by capacity and type and make sure they all have good IR. For example, I have a couple of 14s100p batteries where each pack is 50% one type of cell (Green NCR18650A at 3000mah specs) and 50% another type (Grey LGABB41865 at 2600mah specs) by capacity.
 
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