| ▲ | What is a Lithium-ion capacitor?(jtekt.co.jp) |
| 36 points by ksec 5 hours ago | 11 comments |
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| ▲ | rpaddock an hour ago | parent | next [-] |
| For anyone that wants to see a real data sheet: Nominal Voltage: 4.0V
High Power and Energy Densities
Cycle Life > 50K Cycles
Capacitance Range: 10F-1200Farads https://abracon.com/product-lineup/frequency-control-timing-... Note that the original data sheets said that these could be wave soldered. ABSOLETLY NOT. Even hand soldering they must be treated with respect, a lot of respect. One of the major problems with these is there a minimal voltage that they must not go below. Their life gets shortened. I've never seen data on how much. To my knowledge Li-Ion Capacitors were first introduced to the market by Taiyo-Yuden in 2010. They are no longer in this market. I wrote a blog about it back then: http://blog.softwaresafety.net/2010/11/introducing-lithium-i... |
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| ▲ | supertroop 41 minutes ago | parent | prev | next [-] |
| Dumb question but I though capacitors store energy and not power? |
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| ▲ | azornathogron 37 minutes ago | parent [-] | | They store energy but there's a limit to how quickly you can get that energy out, hence a limit to power. And I suppose you can kinda talk about them "storing power" in the sense that power is what you might be interested in getting out of them. At least, that's my understanding of it. |
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| ▲ | mrDmrTmrJ an hour ago | parent | prev | next [-] |
| Let's say you want to make a hybrid car lighter-weight. Where is this useful? Power density and cycle life are truly impressive. Energy density is super low |
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| ▲ | ricardobeat an hour ago | parent | next [-] | | Interestingly it seems to have some applications for high peak power and regen, they had a car in the Dakar rally: https://www.jtekt.co.jp/e/products/capacitor/capacitor_mobil... https://www.jtekt.co.jp/e/engineering-journal/assets/1019/10... | |
| ▲ | colechristensen an hour ago | parent | prev | next [-] | | You would use these to provide peak power in a system that had short term power needs that were high above the average power needs AND had that power requirement as a bottleneck. Energy is the bottleneck for cars though, not power. unless you're wanting your prius to accelerate like a ferrari Maybe it would be useful for less losses with regenerative braking? These would presumably be able to charge much faster and then trickle that power out to the normal battery. You'd need actual power numbers for a car to determine if it would be useful or not. In other words this is for "boy I wish I didn't have to have so much extra battery capacity in order to get the power I need" situation which... cars don't have. Maybe in F1? | | |
| ▲ | marcosdumay 31 minutes ago | parent [-] | | > unless you're wanting your prius to accelerate like a ferrari That's the point of a hybrid. |
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| ▲ | traverseda an hour ago | parent | prev [-] | | Regen braking, |
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| ▲ | LorenPechtel 2 hours ago | parent | prev [-] |
| And no mention of the self discharge rate. |
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