4 Minute EV Battery Charging? ?

[Rocksnsalt]

Will it be here some day, in some form…?

Student team breaks the 4-minute barrier for EV fast-charging

It's often the case that technologies developed for racing vehicles trickle down to the wider automotive market. With an endurance race in its sights, a team of more than 30 students at Eindhoven University of Technology (TU/e) in the Netherlands has developed a technology that's allowed a 250-km…

newatlas.com

 

[meetyg]

Interesting...
I know the industry is working on all sorts of chemistries that would enable fast charging.
But it seems that these students are supposedly using standard off-the-shelf EV batteries and just better cooling methods are applied to handle the heat.

They don't mention how many cycles the battery can go through with 4 minute charging like this. I would suppose not much, even with better cooling.

 

[curiouscarbon]

As the fast-charging process generates a lot of heat, the students – which now number more than 30 – had to find a way to stop the battery cells from quickly degrading during the fast-charging process.

"We developed an innovative cooling technology at module level, where cooling plates filled with coolant were placed between the modules containing the cells," said team manager, Julia Niemeijer. "This allowed us to extract a lot of heat from the pack. If you want to extract heat as efficiently as possible from the battery pack, you want to cool as close as possible to the battery cells. Therefore, we have developed a method that enables cooling at the cell level, with actual coolant flowing between each cell."

29 kWh battery pack charged to 80% in 4 minutes...
(29.2kWh * 60*60*1000 J/kWh) = ~105120000.0 Joules max stored
(105120000.0 Joules*0.80) = 84096000.0 Joules per 80% charge
(84096000.0 Joules / (4 minutes*60 seconds/min)) = 350,400 W average charging rate

averaging 350 kilowatt charging for a 4 minute 80% charge is pretty neat!

especially for a 30kWh pack. that's a 12C charge