Stark Battery Tech Thread

[Theo]

I don't see fast charging as much of a technical hurdle as reaching energy density in the 500s Wh/kg?

After all, commercial 21700 cells like Molicel P50B released in 2024 was already rated 5C allowing 15ish min charging.

Of course it would degrade cycle life but we're really close from that not being a concern anymore: P50B is rated at 750 (5C/-1C) cycles for 80% retention, CATL just unveiled a 5C cell rated for 3000 cycles at 80% retention (not many details not any release date yet).

In this coffee break charging goal, I believe the real hurdle is charging infrastructure. And here the limitation comes from your government rather than the technology.

I think that one of the main technical problems is heat. Let's say that a fast rider uses the whole charge of a 6.5 or 7.2 kWh battery in 0.5 hours, that means that the average power output has been roughly 14 kW. On the straightaways he probably used way more but then there is also braking and cornering.
Now, such a rider could potentially overheat the bike, especially if the environmental temperature is high.
Then this rider puts the bike under charge and now the charging power is maybe 7 kW or more, but it's continuous. The chances of overheating keep being high.
IMO it would be cool, no pun intended, if they managed to make some kind of tool that can significantly actively cool the battery and if necessary the powertrain while fast charging. Maybe something with peltier modules, for example.

 

[happyinmotion]

Cars have fully shifted to water-cooled batteries so they can have fast charging without overheating. I think that's going to be valuable for bikes, despite the smaller size of batteries. Liquiud battery cooling won't work for the Varg platform but I'm assuming the next bikes will be different.

In this coffee break charging goal, I believe the real hurdle is charging infrastructure. And here the limitation comes from your government rather than the technology.

Absolutely. NZ government decided to just let the free market handle it and that's a foolish way to do infrastructure. Of course now we have ten different networks needing ten different apps and ten different accounts for a country that's got a population the same size as Alabama. And somehow fast charging ended up as much as buying petrol.

 

[Beagle]

Can't find any online trace of Stark livestream about battery tech that was supposed to happen yesterday?

We don't really need Anton taking down Donut to know it's pure BS: there are conflicting news from Verge and Donut but Verge motorcycles deliveries could have suddenly been delayed from March 26 to end of the year 26 for Estonia/Finland and well into 27 for other countries. It could be dates for just "orders made today" but they have made contradictory statements regarding this.
By their own admission, annual production capacity is supposed to be 350 motorcycles. Which would still be huge for them since they've only ever made about 100 motorcycles since the company started in 2018.
And the bike is not certified anywhere at the moment...
Don't hold your breath folks.

https://insideevs.com/news/786388/verge-motorcycles-donut-labs-solid-state-battery-ev/

 

[Proxxon]

Can't find any online trace of Stark livestream about battery tech that was supposed to happen yesterday?

Noticed they went live on their instagram page, but was to late to join it live. And now I can't see it anywhere.