Welcome, Put as many cells in parallel as possible / laptop cells aren't designed for massive amount of current from a single cell. How big of battery are you thinking about? Look up your laptop cells here https://secondlifestorage.com/index.php?pages/cell-database/ the link is under battery tools at top of page. Many are listed there.
later floyd
>it should be 48v around 20ah +-
Do you know the amps @ 48v or the wattage required for the high-amp bursts? Is it 1000w or ?
Agree with @floydR - laptop cells just don't have short-burst-high-amp capabilities. If you attempt high-amp on laptop cells, the voltage drops like a rock. For example if you try to pull 2-3a from a laptop cell charged to 4.1v - it might drop to 3.5v instantly and within seconds go right down to 3.0/BMS cutt-off. The effect would be the bike just wouldn't take off.
You would need on the order of 5 laptop to 1 high-drain cell kind of thing - need to do some numbers so just take this comment as an illustration. My point is a laptop cell battery would need to be on the order of 5x bigger than high-drain cells. Its true that there would be 5x the overall power... but bursts of high-drain makes the voltage drop so far you loose access to the power as the BMS may cut-off etc.
50a@48v.... If we go with 1a/cell, then you'll need something like a 14s50p made of laptop cells. I know the specs will say things like 4250ma max discharge - but in my experience laptop cells don't perform anywhere near this.. which is why I offer 1000ma max discharge / cell as a guide.
If 14s50p is too large, you can always build smaller and test and see what 50a does and if its suitable for you. It won't 'blow up' to pull 2a/cell - just may not give satisfactory performance.
and that's even big.
But 1.000W or 1.500W is extreme for an ebike. You know there is a limitation by law to 250W continous output and 25KMh in Germany?
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