Electronics > Power/Renewable Energy/EV's

1,000,000 km EV car battery?!!

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Brumby:

Siwastaja:
Many EV batteries have already succeeded in that in anecdotal experiences, so it's not like any sort of chemistry breakthrough is needed.

Most helpful enabler for long battery life is battery capacity getting bigger, reducing not only depth-of-discharge but relative current, especially charge rate. Plus decent thermal management systems (temperature equalization within pack, active cooling, maybe even heat pump based).

And manufacturers can deal with overguaranteeing, it's a thing, normal business risk management. If they fail in large numbers before, say, 300 000km, then they have a real problem. But guaranteeing 1 000 000 km is not much different from guaranteeing 400 000 km. Most of the cars are already rusted through and dismantled at that point. Battery warranty most likely has conditions like "does not apply to second life use". Even if remaining 1% of customers who drive beyond 400 000km saw 100% failure rate and full replacements, the marketing advantage for giving such guarantee and the growth enabled by that more than pays for those replacements.

tszaboo:
Great, then the battery will last 5 times as much as the rest of the car. Hooray, polar bears saved.

Siwastaja:
Though, building cars which can last for 400 000 km or so would be a great idea. In a modern ICE vehicle costs after 200 000km increase more because there are all sort of expensive NOx sensors and whatnot, some engines are also more notorious to simply wear out (piston seals, whatever). All that can be addressed by maintenance and repair but it kinda builds up at certain point making it appealing to just get a new car instead.

It's not like EVs are free of maintenance either, at around the same 2-300 000km mark you would have wear with suspension, steering, parts etc., but fewer cost items nevertheless.

And as is well known, the battery is the most expensive part, therefore aiming for 4-500 000 km service life doesn't sound like a bad idea to me. If the cars only last for 200 000km then that is something to be resolved instead of hoping that batteries would die soon after 200 000km, too.

nctnico:

--- Quote from: Siwastaja on September 16, 2024, 01:39:21 pm ---Though, building cars which can last for 400 000 km or so would be a great idea. In a modern ICE vehicle costs after 200 000km increase more because there are all sort of expensive NOx sensors and whatnot, some engines are also more notorious to simply wear out (piston seals, whatever). All that can be addressed by maintenance and repair but it kinda builds up at certain point making it appealing to just get a new car instead.

--- End quote ---
That depends a lot on make & model. You can still find ICE cars which will last 400k km without breaking the bank. The utterly cheap and bog standard Ford I have is an example of such a model.


--- Quote ---It's not like EVs are free of maintenance either, at around the same 2-300 000km mark you would have wear with suspension, steering, parts etc., but fewer cost items nevertheless.

--- End quote ---
Suspension is typically worn after 120k to 150k km. Unfortunately this is not seen as the safety risk it actually is because worn suspension severely impacts how well a car can go around corners and brake. Second unfortune is that replacing the suspension parts is one of the most expensive repairs you can have on a car. Count on 1000 to 2000 euros for a reasonably standard car. But I happily spend that as I value the lifes of my loved ones.

Still, I think aiming for a useful life of a car somewhere between 300k and 400k km is good enough. It will take about 20 years to drive that much.

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