Battery cooling during charging

[Erwin P]

Guestion for those more into battery tech.

During sessions on the local SM track i can feel that 80 hp on the straight isn't 80 hp anymore after some sessions. The track day is 20-30 min riding, 30-40 minutes full power charging and that for a couple of times. Around the 2nd or 3rd session you can feel going onto the straight isn't as fast anymore. It still keeps up with the ICE's, but not flying by anymore.

Does it make sense to drag a 50cm fan with me and have it blow over the battery while charging or is the effect to little to care?

 

[Beagle]

Supermoto must be the most taxing use besides deep sand.
You'd need to check if it's the battery or inverter the hottest (though they may not have same thermal limitations so no guarantee that the hottest would be the limiting one?).
Anyway, yes, it can only help, that would be an interesting experiment. You could even go full MotoGP style with a leaf blower!

 

[Philip]

Arctic misting fan

Try a Arctic fan out today when changing. Battery temp went from 109 to 83. Also did not get the Thermal Limiting code today which was a plus 👍 Will check it out more next time out.

electricdirtriders.com

 

[Erwin P]

Supermoto must be the most taxing use besides deep sand.
You'd need to check if it's the battery or inverter the hottest (though they may not have same thermal limitations so no guarantee that the hottest would be the limiting one?).
Anyway, yes, it can only help, that would be an interesting experiment. You could even go full MotoGP style with a leaf blower!

Good thing that its main usecase with me is Sand MX, second Sand Enduro and third SM.

I can't see any temperatures apart from what my camera can see on the outside .However the motor and inverter are liquid cooled. While charging the pump and blower are on so my guess is that the battery, wich has no cooling, is the limiting factor.

Mmm the leaf blower could be a more focused blow, but that would need some housing i guess.

 

[Beagle]

Good thing that its main usecase with me is Sand MX, second Sand Enduro and third SM.

I can't see any temperatures apart from what my camera can see on the outside .However the motor and inverter are liquid cooled. While charging the pump and blower are on so my guess is that the battery, wich has no cooling, is the limiting factor.

Mmm the leaf blower could be a more focused blow, but that would need some housing i guess.

MotoGP team blow directly in the ram air intake (not applicable to the Varg) but they also sometimes let it sit in front of the radiator and blow directly at it, kinda simulates airflow while riding, you could do the same with the battery pack? Of course there's a thing called a front wheel but with an angle or something, I would try from the front of the bike.

 

[EM3evTech]

Makes total sense to bring the fan. You are basically heat-soaking the pack with the SM track riding, and the 40-minute fast charge doesn't give it a chance to cool down naturally. Even though you are only cooling the outside of a heavily sealed enclosure, forcing ambient air over it will pull heat away significantly faster than still air. Every degree counts when you want to keep the full 80hp map unlocked.