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Half charging lithium ion batteries for longer life expectancy
jonovid:
battery half charging and battery life expectancy
why is it that electric vehicles can have a battery life expectancy of over 10 years or more!
but most call phones , e-bikes and other electronic appliances that use the same lithium ion batteries have a battery life expectancy only 2 or 3 years.
can half charging lithium ion batteries for longer life expectancy work on call phones and other electronic appliances too?
how would you do this? in a charger design. add a timer? if you know the full charge time.
tom66:
Both my laptop and smart-watch can limit the peak state of charge to increase battery lifetime. In the case of the watch, it charges overnight to 75%, then predicts you will use it just before getting up, so it finishes off the charge to 100%.
My impression is that Li-Ion battery life is just naturally improving anyway. I had a 6 year old iPhone at one point which would easily do over a day on a full charge and the internal diagnostics indicated it was at 90% health. Similarly, the battery in my PHEV has a good remaining lifespan, at least 95% original capacity left since 3 years past when it was replaced (recall due to water ingress, not cell failure).
jogri:
There's a lot more to unpack here...
-electric cars use a different cell chemistry for their battery packs (compared to mobile devices) that boasts a higher cycle count (number of times you can charge/discharge the battery before it's "dead" due to a drastically lower capacity)
-phones and mobile devices are designed to have the highest volumetric energy density possible (so you can use smaller batteries), while that's not as important for cars. And you don't really need a battery with a life expectancy of 10 years for a smartphone because no one is going to use it that long -> better to use something with a higher initial capacity as something that will outlast the rest of the phone three times over
-car batteries never get charged to 100 % capacity: That shortens the lifetime of the cells, so the battery managment system always keeps them between 20-80 % to ensure a longer life
-most cars have "additional" batteries: If you buy a car with let's say 45 kWh chances are the manufacturer installed something like 50-55 kWh to counter the decreased capacity a few years down the road -> you observe that the range stays the same while the car had to compensate for a loss of range by using additional batteries
So TLDR: keep your batteries between 20-80% if you want them to last longer and refrain from fast charging and discharging
Siwastaja:
Cell phones, ebikes etc. do not fundamentally make the batteries last for just 2-3 years. Whenever this happens, it's either because the manufacturer bought lowest tier crap cells, or somehow failed the battery system design.
EV manufacturers use decent quality cell, even if the same chemistry.
ebastler:
--- Quote from: jogri on May 26, 2022, 09:30:27 am ----most cars have "additional" batteries: If you buy a car with let's say 45 kWh chances are the manufacturer installed something like 50-55 kWh to counter the decreased capacity a few years down the road -> you observe that the range stays the same while the car had to compensate for a loss of range by using additional batteries
--- End quote ---
Is that so? First time I read this; would you have a reference? Thanks!
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