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Yes as do the walls of a cylinder is a gasoline engine, and every moving metal part. but of course by now they tend to last for 20 years or more so nobody care
by gameswithgo 5y ago
Yes as do the walls of a cylinder is a gasoline engine, and every moving metal part. but of course by
now they tend to last for 20 years or more so nobody cares.
There are mitigations steps you can take with an EV: don’t keep it fully charged for long, don’t supercharge too often, store it in a garage and keep it plugged in so it can regulate the pack temps without cycling it. One problem is I don’t know how you can evaluate the health of a pack when buying used.
- vladvasiliu 5y agoIsn't there some kind of indicator the software can produce, as do the laptops and iphones? Or are those indicators not very reliable in practice?
- bayindirh 5y agoIt can be. Apple is very good as it, but it’s another computer with a firmware on the battery, so you need to make sure that it’s not tampered with.
- speedgoose 5y agoYes you have indicators. On a Nissan Leaf you can simply count the number of battery bars in the dashboard when fully charged. On the BMW i3, you can find a number in the dashboard if you know how to find it (it's well hidden). On a Tesla, you can usually look at the range when fully charged. The best is to connect something on the ODB port of the car and collect all the technical values. You need to remember that the battery temperature can influence a lot.
- vladvasiliu 5y ago> You need to remember that the battery temperature can influence a lot. The temperature does influence a lot, but it only influences within a range that's allowed by the current health status of the battery. In my mind, this status is what should be somehow visible / easy to check. As opposed to trying to estimate it given the current temperature and the reported range when X% full or whatever. My iPhone says its battery is X% healthy. I've seen my battery drain quicker when I was using the phone intensively by 0 °C than when it sat on my desk doing nothing at room temperature. But the health indicator didn't go up while in the office.
- dragontamer 5y ago> Isn't there some kind of indicator the software can produce, as do the laptops and iphones? Or are those indicators not very reliable in practice? A full "coulomb count" of a battery can somewhat reliably estimate the amount that a Li-Ion battery has worn out. Its a pretty simple idea: 1. On one charge-cycle... count every electron that enters the battery. 2. As its discharging... count every electron that leaves the battery. Typical phones and laptops will perform a coulomb count whenever you go through charge / discharge cycles (and a full coulomb count will only occur if you go from 0% charge to 100% charge... and a full count is the most accurate). However, this is an external "blackbox" estimate to the life of the battery. You don't really know the battery's condition. There's no chemical test involved where you're sampling the contaminants inside of the Li-ion cells.
- vladvasiliu 5y agoI understand it's an estimation. What I don't know is how useful / close enough it can be. Is this "good enough" for when you're purchasing a used car / computer / iphone or when you're thinking of taking that long trip with your already well-worn Tesla?
- dragontamer 5y agoUnless you plan to buy a chemical analysis system, open up the cells with a chainsaw and perform chemical samples over the electrolyte inside of the cells... --------- I'm fairly certain that any accurate chemical test would destroy the cells, at least with our current level of technology. As such, its not a question of "good enough". Its simply a question of "what is possible". Since nothing better is possible yet, Coulomb Counting is our best methodology.
- dragontamer 5y ago> Yes as do the walls of a cylinder is a gasoline engine, and every moving metal part. but of course by now they tend to last for 20 years or more so nobody cares. None of those parts cost $22,000+ to repair though, like a Li-ion battery that's fundamental to the electric car. We all know how to repair cylinders, pistons, or even engine-lift, transmission repairs or whatever. All those costs are well calculated and well known.
- gameswithgo 5y agoa 600 horsepower engine does tends to cost that much to repair
- petre 5y agoThen again who needs 600 hp in a passenger vehicle? Other than heavy truck or machinery operators, racing cars and generators for hospitals or banks I see no use for such an engine.
- josephcsible 5y agoThe only things you really need are food, water, oxygen, and medical care. But life would really, really suck if you never had anything you didn't need.
- bryanlarsen 5y agoThe engine on a $120k car also costs north of $20k to replace with an new OEM engine. The battery in a $30k EV costs a lot less than $20k to replace.