ti-force
Flashlight Enthusiast
If I were to wire 6 Batteryspace 26650 IMR's, just like in the diagram I made below, what would this be considered? 3s2p? Just trying to get a better understanding of this stuff.
Help with series and parallel battery wiring
- Thread starter ti-force
- Start date
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Yup.
ti-force
Flashlight Enthusiast
Okay, I've read that a good rule of thumb is not to exceed 4 in parallel. Can someone shed some light on this too? Does it apply to all battery types or just certain types? Looking at the same diagram above, could I wire the bottom 4 in parallel and then those 4 in series with the top 2?
Like this:
Like this:
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Mr Happy
Flashlight Enthusiast
No. You would have made non-rectangular arrangement, like this:
XX
XXXX
When you connect up batteries, you should always keep things equally balanced. With six cells your options are:
6s:
X
X
X
X
X
X
3s2p:
XX
XX
XX
2s3p:
XXX
XXX
6p:
XXXXXX
ti-force
Flashlight Enthusiast
Cool! Thanks! Is there a limit to how many pairs can be ran in parallel? When I was searching for this info on my own, I came across a site that stressed two things: Always pull the positive main and negative main opposite from each other, and not to pair more than 4 pairs of paralleled batteries. I think they were referring to lead acid batteries though. I'm not sure if that matters or not.
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Mr Happy
Flashlight Enthusiast
If we are considering lithium ion batteries I don't think it matters how many cells you wire in parallel. However, try to make sure the wires are thick enough and all are of equal length.
When charging the a pack with series arrangements though, you should pay attention to voltage equalization during charging. It is best to use a charge balancer for this purpose.
When charging the a pack with series arrangements though, you should pay attention to voltage equalization during charging. It is best to use a charge balancer for this purpose.
Russel
Enlightened
Here is a link that is handy for figuring out battery wiring. The site refers to Lithium polymer batteries, but you should still find it usefull. It allows you to try various combinations by changing the numbers in the drop down boxes.
Lipo Wiring
Lipo Wiring
ti-force
Flashlight Enthusiast
Thanks for the help guys:thumbsup:. I appreciate it.
TorchBoy
Flashlight Enthusiast
Nup. It's 2p3s. (Seriously.) They're not connected the same.
Russel
Enlightened
What is the electrical difference between 3S2P and 2P3S?
Mr Happy
Flashlight Enthusiast
I think whether it's called "3S2P" or "2P3S", the pack should always be wired as shown in post #1. This helps to improve the balancing between the parallel cells in each bank.
TakeTheActive
Enlightened
Help with Series and Parallel Cell -> Naming Conventions...
From my personal point-of-view, logically I would label the pack "From-the-Inside-Out", thus, using 2000mAh 1.2VDC AAs:
Thanks!
EDIT: And two months ago, I felt EXACTLY the opposite... :thinking:
Seriously, if there's a difference and you know the answer, please share the details with the rest of us. :huh2:...what would this be considered? 3s2p? Just trying to get a better understanding of this stuff.
From my personal point-of-view, logically I would label the pack "From-the-Inside-Out", thus, using 2000mAh 1.2VDC AAs:
- 2P3S: (3.6VDC @ 4000mAh)
XX (1.2VDC @ 4000mAh)
XX (1.2VDC @ 4000mAh)
XX (1.2VDC @ 4000mAh)
. - 3S1P: (3.6VDC @ 2000mAh)
X (3.6VDC @ 2000mAh)
X
X
. - 3S2P: (3.6VDC @ 4000mAh)
X X (3.6VDC @ 2000mAh) || (3.6VDC @ 2000mAh)
X X
X X
. - 3P2S: (2.4VDC @ 6000mAh)
XXX (1.2VDC @ 6000mAh)
XXX (1.2VDC @ 6000mAh)
Thanks!
EDIT: And two months ago, I felt EXACTLY the opposite... :thinking:
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VidPro
Flashlight Enthusiast
|-{===]-|
|-{===]-|
2p
|-{===]--{===]--{===]-|
3S
|-{===]--{===]--{===]-|
|-{===]--{===]--{===]-|
3S2P (3 series batteries parelleled)
|-{===]-|-{===]-|-{===]-|
|-{===]-|-{===]-|-{===]-|
2P3S (2 parellel batteries seriesed)
if there was a distinction, it could be how it is connected?
see the differance ?
in 3S2P we have a Series set, then parelleled it.
in the 2P3S , we have teamed up the parellels first, then seried them.
i am not familliar with its usage , but that could easily define the differance.
also applies when you take 2 premade packs that are in series, and THEN parellel those, often all the cell parellel interconnections would not be done.
But
If your going to do proper balancing to keep the pack alive during charging as a whole set, then all the parellel interconnections would HAVE TO be made.
|-{===]-|
2p
|-{===]--{===]--{===]-|
3S
|-{===]--{===]--{===]-|
|-{===]--{===]--{===]-|
3S2P (3 series batteries parelleled)
|-{===]-|-{===]-|-{===]-|
|-{===]-|-{===]-|-{===]-|
2P3S (2 parellel batteries seriesed)
if there was a distinction, it could be how it is connected?
see the differance ?
in 3S2P we have a Series set, then parelleled it.
in the 2P3S , we have teamed up the parellels first, then seried them.
i am not familliar with its usage , but that could easily define the differance.
also applies when you take 2 premade packs that are in series, and THEN parellel those, often all the cell parellel interconnections would not be done.
But
If your going to do proper balancing to keep the pack alive during charging as a whole set, then all the parellel interconnections would HAVE TO be made.
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ti-force
Flashlight Enthusiast
Interesting.
Thanks for the help guys:thumbsup:.
Thanks for the help guys:thumbsup:.
TorchBoy
Flashlight Enthusiast
Awesome ascii diagrams and description VidPro. :twothumbs
I tried Google thinking there might just be an authoritative source somewhere. A bit hopeful, I guess, as it turned up more electron shells than batteries... and this thread was the first result, with Mr Happy's sensible advice quoted. Another result was a thread on the RCGroups.com forum where a guy opened a battery hoping to find a 3s2p but was disappointed to find the "proper" 2p3s arrangement. But unless someone has better Google-fu than me, the convention seems to just be one of those things.
I tried Google thinking there might just be an authoritative source somewhere. A bit hopeful, I guess, as it turned up more electron shells than batteries... and this thread was the first result, with Mr Happy's sensible advice quoted. Another result was a thread on the RCGroups.com forum where a guy opened a battery hoping to find a 3s2p but was disappointed to find the "proper" 2p3s arrangement. But unless someone has better Google-fu than me, the convention seems to just be one of those things.
ti-force
Flashlight Enthusiast
You guys are great lovecpf. I never would have known otherwise.
Okay, 3s2p like this?
Okay, 3s2p like this?
Russel
Enlightened
Re: Help with Series and Parallel Cell -> Naming Conventions...
That makes the most sense to me.
I recently disassembled a Dewalt DC9180 battery pack for the 18650 size 1100mAh A123 cells inside. The configuration was similar to that in post one of this thread except the pack here would be a 2P6S following the 'inside out' method. Most, if not all of the RC crowd would call this a 6S2P, the number of cells in series always before parallel. But, I couldn't find a standand, and TTA's idea makes the most sense to me.
That makes the most sense to me.
I recently disassembled a Dewalt DC9180 battery pack for the 18650 size 1100mAh A123 cells inside. The configuration was similar to that in post one of this thread except the pack here would be a 2P6S following the 'inside out' method. Most, if not all of the RC crowd would call this a 6S2P, the number of cells in series always before parallel. But, I couldn't find a standand, and TTA's idea makes the most sense to me.
45/70
Flashlight Enthusiast
The proper term for 4s2p, 2p4s etc. has always baffled me. My use of Li-Ion cells is mostly in single cell applications, but I do run up to 3 cells in series, but never any parallel configurations. So, that hasn't been a problem...... yet. :naughty:
With NiMH cells the most extravagant setup I use, is in my P7 4D M@g. I use four cheapo DX 2AA to "D" parallel adapters sometimes, in place of the regular four 10Ah D NiMHs. I've always figured the AA setup as being four sets of parallel paired AA's in series, and called it a 4s2p configuration, as opposed to 2p4s. I suppose this may be because I read through a lot of R/C forums. Now you've all got me wondering? :thinking:
Well, it works anyway, regardless of the proper nomenclature.
Dave
With NiMH cells the most extravagant setup I use, is in my P7 4D M@g. I use four cheapo DX 2AA to "D" parallel adapters sometimes, in place of the regular four 10Ah D NiMHs. I've always figured the AA setup as being four sets of parallel paired AA's in series, and called it a 4s2p configuration, as opposed to 2p4s. I suppose this may be because I read through a lot of R/C forums. Now you've all got me wondering? :thinking:
Well, it works anyway, regardless of the proper nomenclature.
Dave
