Battery pack making_Help needed

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pratikdas87   10 mW

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Battery pack making_Help needed

Post by pratikdas87 » May 08 2017 11:34pm

Dear All,
I am making a battery pack for myself using 18650 cells. I want to make a 3S5P system. my question is can i make 3 blocks of cells each having 5 cells in parallel, and then connect them in series?
normally, people advice to put sells in series first then to connect parallel cells. in my case, although each cell will not be connected to it's next cell in series, each block will be in series with next block. Could you please suggest me if i will face some major issues with my design?

With regards,
Pratik

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amberwolf   100 GW

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Re: Battery pack making_Help needed

Post by amberwolf » May 09 2017 12:35am

Actually most of the time people suggest paralleling first, then seriesing, because of the way BMS's are designed (they monitor a series of parallel groups).

So the way you describe doing it is the normal way it is done.


As long as there is sufficient current path from one group to the next, it works fine.

If all the current has to flow thru parallel interconnects first, to one end or the other, and then go thru a single thin series interconnect, you might have a problem, depending on the current flow you need, and the capability of your interconnects.


There's plenty of 18650 build and idea threads around the forum in the Battery Technology (and other) sections, if you do a search on "18650" in titles of threads and display by topic; most of the results will have relevant info for you, including drawings, diagrams, and images of how people have successfully built such packs.

pratikdas87   10 mW

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Posts: 22
Joined: Apr 22 2017 5:11am
Location: Germany

Re: Battery pack making_Help needed

Post by pratikdas87 » May 12 2017 7:56am

amberwolf wrote:Actually most of the time people suggest paralleling first, then seriesing, because of the way BMS's are designed (they monitor a series of parallel groups).

So the way you describe doing it is the normal way it is done.


As long as there is sufficient current path from one group to the next, it works fine.

If all the current has to flow thru parallel interconnects first, to one end or the other, and then go thru a single thin series interconnect, you might have a problem, depending on the current flow you need, and the capability of your interconnects.


There's plenty of 18650 build and idea threads around the forum in the Battery Technology (and other) sections, if you do a search on "18650" in titles of threads and display by topic; most of the results will have relevant info for you, including drawings, diagrams, and images of how people have successfully built such packs.
Dear amberwolf,
Thank you so much for the information. yes, I am already looking into the 18650 pack threads. there are a lot of information available.

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spinningmagnets   100 GW

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Re: Battery pack making_Help needed

Post by spinningmagnets » May 12 2017 8:21am

Go to the battery section, and look for the stickie thread index

edit....click here:
https://endless-sphere.com/forums/viewt ... 3#p1051327

pratikdas87   10 mW

10 mW
Posts: 22
Joined: Apr 22 2017 5:11am
Location: Germany

Re: Battery pack making_Help needed

Post by pratikdas87 » May 16 2017 1:57am

spinningmagnets wrote:Go to the battery section, and look for the stickie thread index

edit....click here:
https://endless-sphere.com/forums/viewt ... 3#p1051327
Thank you :D

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