• 0 Posts
  • 14 Comments
Joined 3 years ago
cake
Cake day: August 18th, 2023

help-circle

  • All EV batteries aren’t “a battery that size”. They’re a bunch of small batteries all strung together. The “battery that size” statement you made is pretty much meaningless.

    It’s very much physically possible to charge a battery pack at mostly empty to mostly full in 5 minutes. The tech and chemical side of actually getting it done hasn’t quite officially happened yet. Battery charge\discharge rates are measured in “C”. One C is an hour for a 0 to 100% charge. So six C would be 0 to 100 in 10 minutes. That’s doable right now. You’d need 12 C for a 0 to 100% charge in 5 minutes. That hasn’t happened yet, but it’s getting pretty close. 11 C can be done to go from 0 to 80%.

    Likely, BYD’s charging statement is based for the regular layman such as yourself and refers to something along the lines of a charge from 10% up to 80%.

    As a side note, it’s also annoying having these “new EV battery has x amount of range” is dumb. You could get that range 20 years ago if you made the battery pack a lot bigger. What you need to know is the energy density and the size. Like 400 WH per kilogram is currently a really good capacity. Double what you could get from like five years ago.







  • That’s not pretty rare, and with lithium batteries it’s also a guaranteed capacity loss, even if there’s not many power cycles to them. Age is a huge determinate factor in capacity and power loss in lithium batteries. The capacity loss also isn’t on a straight line scale. It increases with time. One or two percent a year loss for the first 5 years and then it will get bigger and bigger. Unlike an ice vehicle that’s kept in a garage and taken care of that can got well over 200,000 miles almost regardless of age, an EV currently can’t do that. They’re terrible in the 2nd and third hand market. A 20 year old EV will be useless.


  • There was at least one company several years ago that was trying. Go to a place and pay a fee, kind of like how you’d swap out a propane gas bbq grill tank. They’d forklift out the empty batt and forklift in the charged one, was their game plan.

    The tech is all too knew for standardization. Too many chemistries and voltages and places to figure out where to stick batteries.

    If what catl is producing right now is correct and true, we should be all set in the coming future. Supposed sodium batteries at 175wh per kilogram and over 10,000 charge cycles and very fast charging. Great for sub 300 mile range small econo vehicles. Then the solid state lithiums they’re working on are also supposed to have a high amount of charge cycles and energy densities close to 500wh\kg, which will give plenty of range and make the cars lighter, which is really needed to ease up on suspension and efficiency and tread wear.


  • If it has to be forced, then it probably isn’t a good idea.

    We’re only just now. Like this year just now, seeing batteries that can be made much cheaper and last much longer (sodium ion) and batteries that will last the actual lifetime of a vehicle (solid state lithiums, allegedly). The cars the past 5 years that have had LifePO4 batts will last decently long. Up until now you’ve been looking at EV’s that cost more, with batteries that will go bad in them that cost huge amounts of money to replace. A 10 year old Tesla with 200,000 miles on it is essentially garbage. No one will pay much for it because it’s about to need a $15,000 battery, and when it fails it’s going to the junk yard. My little ice car has nearly 300,000 miles on it and is old enough to vote. If the engine blows up I could buy a working used one for like $500 and install it myself, or pay somebody else a couple grand to deal with it all for me.

    Passenger cars aren’t the end all be all to global warming or the environment, either. They aren’t the main cause. Most countries grid systems couldn’t handle a complete EV swap by 2035. Look at the issues these stupid ai server farms are causing grid systems.

    My point is, no one should need to force ev. At this point it will become the better and obvious choice over ice on its own. It isn’t there yet for tons of people or countries.