Share this project

Done

Share this project

Done
The first mountable electric drive that turns any normal skateboard into an electric skateboard – within minutes.
The first mountable electric drive that turns any normal skateboard into an electric skateboard – within minutes.
364 backers pledged €309,978 to help bring this project to life.

Why braking can be awesome, too.

Posted by Mellow Boards (Creator)
7 likes

Today we would like to share with you some news about a unique Mellow feature that might not have caught as much attention as it deserves: the dual braking system.

Regenerative braking has been popular on the wishlist of a lot of our supporters. But only few know that it has a dark side too. It creates heat. And heat is a killer, when it comes to electronics. We have put a lot of brainpower to find a solution for this challenge.

So how does a regenerative brake actually work?
Instead of feeding electricity to the motor to move, the drive system is reversed and speed is reduced by transforming your kinetic energy back into electricity, which then has to be stored or re-converted, or both. Anyone who has tried to stop a rider hurtling downhill at more than 40 km/h realizes, this is a lot of energy.

Most systems will send the surge directly into batteries. Instant recharge, right? Wrong. If the battery is full, any recharge will damage it, creating heat and even changing its chemistry permanently. Even if the battery is partially empty, charging *too fast* (nerdspeak: exceeding the battery's C-rating) will also damage it. In addition, all battery packs are made of multiple cells whose individual charge can sometimes fall out of balance with each other, reducing the life of a whole pack if not maintained correctly.

What did we do different?
Before the regenerated energy starts to tax your battery (and your bank account in the long run), Mellow shunts the surge into its secondary braking system: the dynamic rheostatic (thermal) braking. Mellow's active Battery Management System controls the energy going into each cell, giving the battery only what it is rated to handle and sending the excess into its unique braking resistor, where the overload is transformed into heat, then dissipated by the metal hull. The result will be a longer battery life, more breaking power and a much longer breaking time.

FEM analyses analytics of heat diplacement behaviour.
FEM analyses analytics of heat diplacement behaviour.
First prototype of breaking resistor.
First prototype of breaking resistor.

All these theoretical thoughts resulted in a very real design adjustment, which we can’t wait to share with you in the next update.

What happened outside of nerdistan?
We set up the Mellow Beach House at Hossegor at the atlantic coast for a week of surfing and working. Meeting Paul, our host. A long time surfer and istant Mellow enthusiast. Quote: „C’est geniale!“

 On the way back, we stopped by at two of our Kickstarter supporters – Renaud and Bertrand (Boosted Board owner who waited 3! years for it to be delivered). Taking a ride along the incredible Lake Annecy. Great to meet you guys, we will definitely come back to this beautiful place.

And for those hungry for more action shots of Mellow we proudly attached our latest edit we just published with some unseen footage.

 project video thumbnail
Replay with sound
Play with
sound

Speak to you soon.
Keep Riding. Stay Mellow.
Johannes & Kilian

Shabaz Mohammad, Renaud Orange, and 5 more people like this update.

Comments

Only backers can post comments. Log In
    1. Tim Ellis on

      Good stuff. Thanks for keeping up with steady updates.