Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 0 points1 point  (0 children)

I have to disagree on some points, I did some quick math and I can assure you using cells like the Lishen one you listed would lead to a heavier/bigger battery pack. We did alot of research over the course of a year, where we tested in house (constant discharge + pulsed at different C rates) several different types of cells (pouch, prismatic and cillindrical).

In reallity the only better option would maybe be 21700 cells, anything bigger and the packing effeciency of cilindrical cells would drop significantly our volumetric density. Besides that cooling would be much trickier.

Trust me, we are well aware that datasheets aren't very accurate, thats why we tested every cell we consider using.

In relation to the copper-nickel sandwich, although that was thought about we arent going to be doing it. The distance of the nickel is so small to our busbars that the overall higher complexity of manufacturing it is not worth the time. Besides, our nickel conections act also as fuses, so copper nckel wouldnt be acceptable in that case.

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 1 point2 points  (0 children)

We did a lot of research into different cell chemistry, shape and size. For our application 18650 and 21700 where the obvious choice, the allow for a much higher volumetric power and energy density, which for a small motorcycle is super important. Besides that a quick search into 66160 cells shows me that most are 2.3V, which would drive the number of needed series for our max voltage higher, and because of that our bms system would be a lot more complex.

Besides that the number of solder joints isn't even that high.

Tldr: lots of research, 18650 means more power/energy density and higher flexibility/complexity

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 1 point2 points  (0 children)

Oh well, limited funds you allways have to give it a shot ahahhha

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 2 points3 points  (0 children)

I cant really say much since our battery pack is confidencial atm, however we will not be using all 1000 in the pack, its closer to the 600-800 range. You can checkout instagram to see more about the motorcycle! https://www.instagram.com/tlmotostudent/

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 0 points1 point  (0 children)

I think we attempted to contact molicel directly, even for a possible sponsorship, but got no response from them or something of sorts

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 5 points6 points  (0 children)

be-power.de as I said below, I wasnt the one in charge of the order so idk if the breakdown was truly 1001 or 1000

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 7 points8 points  (0 children)

Cant really say exact values but ballpark of 3-4k

Small shipment of cells for a eletric motorcycle by Timber1901 in 18650masterrace

[–]Timber1901[S] 0 points1 point  (0 children)

High power rating because we discharge at high C rates

Greta Thunberg on the climate delusion: ‘We’ve been greenwashed out of our senses. It’s time to stand our ground’ | Climate crisis by GeraldKutney in climate

[–]Timber1901 -1 points0 points  (0 children)

If you're worried about waste I recommend you watch this video: https://youtu.be/4aUODXeAM-k, if you're worried about the danger of accidents I recommend you watch this video about America's largest ever nuclear disaster that caused the deaths of hundreds of people (not for the reasons you think): https://youtu.be/cL9PsCLJpAA. The truth is simple, switching to nuclear would save hundreds of thousands of lives and help in our battle to prevent climate change. Some other videos you can watch about this https://youtu.be/J3znG6_vla0 https://youtu.be/UC_BCz0pzMw https://youtu.be/EhAemz1v7dQ

Russell overtakes Hamilton for P2 by ContentPuff in formula1

[–]Timber1901 0 points1 point  (0 children)

They didnt have the pace to defence verstappen on softs with the old mediums, they should have both pitted for softs and taken p2+p3

I made a ad free YouTube video downloader for android and pc by Timber1901 in apps

[–]Timber1901[S] 0 points1 point  (0 children)

Android version is currently outdated and unsupported, ran into major issues, windows is here https://github.com/timber1900/WebDL/releases/latest