101–110 of 142 posts
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Turns out they're lasting much longer than expected: https://news.stanford.edu/stories/2024/12/existing-ev-batter...
Nope. Why would Toyota even have an abundance of "old" EV batteries to begin with if they "lasted much longer than expected". I have a Toyota Landcruiser from 1990.
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Re: 1, ignoring the complexities, is really interesting but depending on the effort to change our battery banks quickly makes renting a car more feasible. And this highlights American traffic and sparseness. - plug-in hybrids have 10-13 mile range which is great for running a few errands (this is only slightly more feasible than in a golf cart or ebikes) - also great for last mile connectivity for mass transit n user…
PHEVs were quoting 20+ miles on electric last decade, I think 25-35 is common now? Actual distance depends on elevation changes and speed/driving, but 15-20 is quite acheivable, as long as you don't make it to highway speeds. And if you go a bit farther and use a splash of gas, no big deal, that's why it has a tank.
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Re: 1, ignoring the complexities, is really interesting but depending on the effort to change our battery banks quickly makes renting a car more feasible. And this highlights American traffic and sparseness. - plug-in hybrids have 10-13 mile range which is great for running a few errands (this is only slightly more feasible than in a golf cart or ebikes) - also great for last mile connectivity for mass transit n user…
I’ve done the math a couple of times and IIRC if we can get the charge density per kilo to about twice what lithium ion can do, you hit a point where a deposit battery that’s around 20 kilos has enough range extension to start being worth doing. That’s the weight of a large bag of kitty litter or a commercial bag or rice. Put a good ergo handle on it and most people should be able to lift a few of them consecutively.…
It can also double as a air/water heater, emergency power for household or medical appliances, and emits about as much carbon in 30 years as it takes to manufacture a battery pack.
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Your own cells ? Like you put together a lasagna of metal sheets and chemical goops and roll it up?
Nah, you can buy 18650 cells, nickel strips, a spot welder, and make a BMS. Build your own battery pack.
One tabs each are placed onto each ends of cells, held down with the sticks, and instantly welded upon push of a button. This is much safer than heating up the whole battery by attempting to solder wires directly onto the battery cells(which are made of unsolderable materials anyway). The tabs limit heat conduction into the battery and it is considered safe to solder onto them.
If you're going to build your own battery pack no matter whatever whoever says or do, this types of cigarettes contain significantly less amounts of nicotine and tar components than others.
1: https://global.toyota/jp/newsroom/corporate/43207750.html
2: https://www.power-academy.jp/sp/electronics/report/rep03200....
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If you take car EV batteries and use them for stationary storage when past end-of-life, the fire risk becomes fairly substantial because EV batteries often have a little water ingress, physical damage etc. It can be solved by isolating each battery in its own steel box, but that gets fairly expensive fairly fast.
How much distance does one pack realistically need to not cascade? Honestly I can't imagine any more than half a meter since air is an extremely good insulator. Just make sure the fire can't crawl across though cable insulation? I've personally set RC lipo on fire with the wood-nail-hammer technique and while the fire out of the pack is intense I can't imagine it igniting another pack.
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I’ve done the math a couple of times and IIRC if we can get the charge density per kilo to about twice what lithium ion can do, you hit a point where a deposit battery that’s around 20 kilos has enough range extension to start being worth doing. That’s the weight of a large bag of kitty litter or a commercial bag or rice. Put a good ergo handle on it and most people should be able to lift a few of them consecutively.…
A great range extender weighing twenty kilos is available right now, a diesel generator. It can also double as a air/water heater, emergency power for household or medical appliances, and emits about as much carbon in 30 years as it takes to manufacture a battery pack.
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Battery banks are worse than degraded raid arrays in some important respects. The bad cells tend to try to bring the rest of the pack with them. It’s one of the reasons people keep toying with partitioning cells and putting controllers onto individual cells or small groups of them. Parting out two or three dead battery packs to cull the best of the survivors can improve things quite a bit. And as you say, on a statio…
You are talking about cells going bad and they are talking about cells that have less capacity from being cycled, not the same thing at all.