lithium cell series / paralell
Hi guys,
Ive been sitting reviewing info in regards to connecting cells in series and parrarlell, After what ive read my understanding is that if i want to use a voltage of 36 volts. I would connect 10 x 3.6 volt cells togeather in series. But if my aim is to create a 10ah + battery I would need to connect say 6 x 3.6 volt 2200mah cells in pararlell. Ok my question is if i want the voltage to remain at 36 volts do i reduce the series chain by one cell and connect the paralell chain in with the series given that the parallel would also = 3.6 volts |
If I understand your Q, I think you need to connect 2 X 5 X 3.6v battery's in series, and then the 2 sets of 5 X 3.6 battery's in series... But I'm not an engineer, or electrician... But that is what I would look into... DrkAngel should certainly able to answer you... ;)
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battery
Pretty sure that you need 10s X 4p, that is 10 batteries in series (positive of one to negative of next, but each cell is 4.1 or so and you would have 41V or so), then 4 "rows" in parallel (positive to positive and negative to negative) to get 10 amps. Therefore 40 say 18650 cells for most Lithium cells (at about $7.00 or more each), then you have to "assemble" it. You can save money with LiPO (look at Hobby King), but it can be dangerous (read up on them). Good luck.
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Originally Posted by 2old
(Post 17231892)
Pretty sure that you need 10s X 4p, that is 10 batteries in series (positive of one to negative of next, but each cell is 4.1 or so and you would have 41V or so), then 4 "rows" in parallel (positive to positive and negative to negative) to get 10 amps.
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I'm lost already.
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equal packs required
firstly cheers for all the responses guys,
After reviewing further, Prathmann is right due to the fact each pack has to be equal to the other to what ive reviewed. in theory my first idea would work but in practice you couldnt mass charge in that way from what ive reviewed. |
Originally Posted by makin1
(Post 17233983)
firstly cheers for all the responses guys,
After reviewing further, Prathmann is right due to the fact each pack has to be equal to the other to what ive reviewed. in theory my first idea would work but in practice you couldnt mass charge in that way from what ive reviewed. example 4 x 2200mah in pararalel would be 3.7 volts and 8800mah 10 strings of that in series would be 37 volts and 88AH |
Originally Posted by makin1
(Post 17234074)
looks like if all cell packs need to be equal it would make more sense to create mutiple strings of parralel and then put them in to series.
example 4 x 2200mah in pararalel would be 3.7 volts and 8800mah 10 strings of that in series would be 37 volts and 88AH And putting 10 sets of your 8.8 A-hr (8800 mA-hr) in series will still give you only 8.8 A-hr (putting them in series increases the voltage but leaves the A-hr rating the same). To get over 10 A-hr you still need to have 5 parallel 2.2 A-hr cells. |
Originally Posted by prathmann
(Post 17232104)
Close, but if each cell is only 2200 mA-hr (i.e. 2.2 A-hr as stated by the OP) then putting 4 rows in parallel will only get you 8.8 A-hr - so still a bit shy of the OP's desired 10 A-hr rating. 5 rows in parallel where each row has 10 cells in series would give you a battery pack with an 11 A-hr rating.
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1 Attachment(s)
Originally Posted by 2old
(Post 17234219)
Thanks, forgot to take my shoes off when I calculated.
http://bikeforums.net/attachment.php...hmentid=412999 |
Originally Posted by makin1
(Post 17234254)
after taking comments in to consideration i put this togeather. Let me know what you think. This is two strings of 10 linked in Serial / parallel
http://bikeforums.net/attachment.php...hmentid=412999 |
1 Attachment(s)
Originally Posted by makin1
(Post 17234254)
after taking comments in to consideration i put this togeather. Let me know what you think. This is two strings of 10 linked in Serial / parallel
http://bikeforums.net/attachment.php...hmentid=412999 Your diagram, 10s2p is 37V 4400mAh = 37V 4.4Ah I am hoping these are new cells? 2200mAh cells are either very old laptop or reasonably new higher C rate cells. Cells should be tested, even new cells, then connected in parallel with balance leads-wires. 10s8p http://bikeforums.net/attachment.php...hmentid=413517 See - Homemade Battery Packs Your cells, in diagram, as connected, without parallel balance leads, could be comparative capacity tested. If all new or reasonably same condition, same brand-model cells. Make sure all cells are at identical voltage. Simply discharge and measure every cell at timed intervals. Comparative capacity is determined by voltage loss. Rate by final voltage after timed discharge, (eg. 1 hour of 1A discharge?) Any with exceptional voltage loss should be eliminated as defective. 2200mAh laptop cells will be hard pressed , at 10Ah, to motivate an eBike. Cells for power tools etc., higher C rated, might do just fine ... |
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