EndlessDoge
1 µW
Hi, this is my first post.
I’m trying to resurrect an Aprilia Enjoy by building a replacement battery pack using 18650 cells.
After lurking around here and on Jobike, I designed this battery pack.
if anyone could check it I would be grateful
The original NIMH pack had a nominal voltage of 24V, the output of the original charger was 32v though so I think that my pack being at 28V when fully charged shouldn’t be a problem (28V because I’ll stop charging when cells reach 4v instead of 4.2).
The motor is rated for 245w (actually the manual says 250w but on the motor there’s a label that says 245w)so it should draw around 10A at 25,2v but according to what people posted on Jobike and also to what my dad measured at the time , if someone cuts the white wire on the controller the motor can draw 70/80A for short periods of time.
Could my pack withstand such load or would the nickel strips overheat?
--
The white wire is a “feature” of this ebike’s controller, it’s a wire that goes out from the controller and then goes back in.
When someone cuts it the bike isn’t limited to 24 kph anymore, it can reach 40 effortlessly and if the speed selector is set to 3 the motor works all the time, even when not pedaling, and maintains the last speed you were pedaling at
--
I’m planning to use 18650 spacers like these: https://www.aliexpress.com/item/32948548101.html, some insulator rings on the positive ends of the cells and heat shrinkable pvc on the outside.
Is this enough or should I add something else to protect and insulate the battery? I saw that some people on this forum used some kind of adhesive tape wrapped around the whole pack.
I also found on AliExpress protective cardboard that’s made to be sticked above the nickel strips (https://www.aliexpress.com/item/4000349196151.html), what would that be useful for if the pack already has pvc around it?
I’m trying to resurrect an Aprilia Enjoy by building a replacement battery pack using 18650 cells.
After lurking around here and on Jobike, I designed this battery pack.
if anyone could check it I would be grateful
The original NIMH pack had a nominal voltage of 24V, the output of the original charger was 32v though so I think that my pack being at 28V when fully charged shouldn’t be a problem (28V because I’ll stop charging when cells reach 4v instead of 4.2).
The motor is rated for 245w (actually the manual says 250w but on the motor there’s a label that says 245w)so it should draw around 10A at 25,2v but according to what people posted on Jobike and also to what my dad measured at the time , if someone cuts the white wire on the controller the motor can draw 70/80A for short periods of time.
Could my pack withstand such load or would the nickel strips overheat?
--
The white wire is a “feature” of this ebike’s controller, it’s a wire that goes out from the controller and then goes back in.
When someone cuts it the bike isn’t limited to 24 kph anymore, it can reach 40 effortlessly and if the speed selector is set to 3 the motor works all the time, even when not pedaling, and maintains the last speed you were pedaling at
--
I’m planning to use 18650 spacers like these: https://www.aliexpress.com/item/32948548101.html, some insulator rings on the positive ends of the cells and heat shrinkable pvc on the outside.
Is this enough or should I add something else to protect and insulate the battery? I saw that some people on this forum used some kind of adhesive tape wrapped around the whole pack.
I also found on AliExpress protective cardboard that’s made to be sticked above the nickel strips (https://www.aliexpress.com/item/4000349196151.html), what would that be useful for if the pack already has pvc around it?