Shawn West es un norteamericano que ha presentado en la red de micromecenazgo Kickstarters, una pila capaz de recargarse en apenas 25 segundos. Un diseño que utiliza el principio de los supercondensadores, pero sin los problemas que estos tienen para ser aplicados a aparatos electrónicos.
Hay quienes apuntan que el proyecto debería ser catalogado como estafa.
De reddit:
Ok, I guess I will take the honor of explaining why this is total BS and why some random guy in Kansas figured out something that has eluded billion dollar corporations (hint: he hasn't). In fact he isn't doing anything more than putting together off the shelf parts.
What this guy is doing is taking a new type of super capacitor and attaching it to a linear regulator. I'll give it to him, the caps he is using have pretty impressive specs. I have not heard of them before, but upon looking them up I was impressed. These things are really good - really good for capacitors. They, like all other caps, are still trash compared to batteries.
But lets start with the linear regulator because that's an easy fish to fry. If capacitors ever get used as batteries, they will use a buck/boost converter (buck in this case). Linear regulators work by "throwing out" the energy you don't use. The cap has 3.8V and you want 1.5V, the linear regulator simply throws the 1.3 volts extra out the window. Its akin to having a thermostat that only runs at 90F, and you have to open your windows to lower the temperature to the 70F you want inside. You throw away the 20F difference. Really inefficient. Buck/boost converters on the other hand convert energy rather than throw it away. They are way more efficient and versatile than linear regulators and that's why many of you are holding one in your hand right now (regulated mods use them). So right there this guy is throwing away ~30% of the energy in those caps.
Now lets get to the real question. Whats the capacity? Your run of the mill alkaline AA battery has a battery life of about 3.9Wh. Looking around it appears he is using a 3.8V 40F lithium ion cap. Mind you, for a cap that size, 40F is HUGE HUGE HUGE!! But lets see just how much energy that is. Convert farads to joules (F=J/V2 ) and we get 578 joules. 1 joule is 1 watt-second. 578 watt-seconds is 160, wait for it,.....160 milliwatt-hours. Or 0.160 Wh, a measly 4% of your regular AA battery. But wait, he is using a linear regulator too, so don't forget to trash 30% of that figure. This leaves us with 112 mWh or 2.8% of an AA battery. If I had a kickstarter account I would report this guy in a heartbeat. He is straight up playing on people's ignorance to get $10k.
Comentarios
Hay quienes apuntan que el proyecto debería ser catalogado como estafa.
De reddit:
Ok, I guess I will take the honor of explaining why this is total BS and why some random guy in Kansas figured out something that has eluded billion dollar corporations (hint: he hasn't). In fact he isn't doing anything more than putting together off the shelf parts.
What this guy is doing is taking a new type of super capacitor and attaching it to a linear regulator. I'll give it to him, the caps he is using have pretty impressive specs. I have not heard of them before, but upon looking them up I was impressed. These things are really good - really good for capacitors. They, like all other caps, are still trash compared to batteries.
But lets start with the linear regulator because that's an easy fish to fry. If capacitors ever get used as batteries, they will use a buck/boost converter (buck in this case). Linear regulators work by "throwing out" the energy you don't use. The cap has 3.8V and you want 1.5V, the linear regulator simply throws the 1.3 volts extra out the window. Its akin to having a thermostat that only runs at 90F, and you have to open your windows to lower the temperature to the 70F you want inside. You throw away the 20F difference. Really inefficient. Buck/boost converters on the other hand convert energy rather than throw it away. They are way more efficient and versatile than linear regulators and that's why many of you are holding one in your hand right now (regulated mods use them). So right there this guy is throwing away ~30% of the energy in those caps.
Now lets get to the real question. Whats the capacity? Your run of the mill alkaline AA battery has a battery life of about 3.9Wh. Looking around it appears he is using a 3.8V 40F lithium ion cap. Mind you, for a cap that size, 40F is HUGE HUGE HUGE!! But lets see just how much energy that is. Convert farads to joules (F=J/V2 ) and we get 578 joules. 1 joule is 1 watt-second. 578 watt-seconds is 160, wait for it,.....160 milliwatt-hours. Or 0.160 Wh, a measly 4% of your regular AA battery. But wait, he is using a linear regulator too, so don't forget to trash 30% of that figure. This leaves us with 112 mWh or 2.8% of an AA battery. If I had a kickstarter account I would report this guy in a heartbeat. He is straight up playing on people's ignorance to get $10k.
TL;DR: It's a scam.
Fuente: http://www.reddit.com/r/electronic_cigarette/comments/2aj97o/i_have_found_batteries_on_kickstarter_that_can/
ains, kickstarter y sus estafas..
Me extraña que aun nadie haya hecho un kickstarter para un vacuna contra el cancer con 20.000$
La noticia en español.
http://www.brainzum.com/ya-puedes-comprar-la-bateria-que-se-recarga-en-25-segundos/