https://hbr.org/2024/05/how-one-chinese-ev-company-made-batt...
Nio is just a company that's providing a much needed solution to this problem.
There's an Australian company https://www.januselectric.com.au/ doing them. They do electric conversions on existing trucks.
To me, it's not really viable. The 3 main problems are - The extra costs in a vehicle to allow swapping within say 5 minutes is non-trivial. The physical space required to house X number of batteries ready, X number swap ready is a lot at any moderate volume. Last, Batteries are not universal and now you're constricting either the design of all cars or you have to go to a specific swap station that houses your battery, related to the physical space. I would not accept a battery w/ less volume.
Time will tell if I'm wrong; NIO might do it, but I'm a naysayer for sure.
The main obstacle is battery swap is capex heavy, hence PRC might do it, but most other places, less likely. It's pretty easy to extrapolate PRC auto parking / self driving cars sneaking out during low congestion to hit their battery swap queue. But that is a fairly significant logistics / infra issue when most countries would be lucky to get sufficient fast charging piles in place. Battery volume is probably not an issue since batteries will be rentals for minimum XYZ capacity. And algo might eventually bid for price, i.e. discount rental for partial charge if it means your car go for a swap by itself a couple days earlier.
For converting from ac to dc for charging you had either a dc generator or old school selenium rectifiers or vacuum tubes ones. I used to have an old 60's battery charger with selenium rectifier. First car I drove had a DC generator. So wasn't until the 70's you got cheap high quality rectifiers and thyristors.
When I started my career in the 80's it was all coming together. Robust power electronics shows up then. By the end of the decade inverter controllers for motors were becoming common. And the mid 90's is when Toyota starts working on their hybrid drive. The battery they used was a nicad battery.
And then there are batteries. Before 1980 or so you're options were lead acid or nicad. The former have low energy density and the max output current was low. Nicads were expensive and also low capacity, but had higher output per weight. Which is why the Prius and the EV1 used them.
Late 80's I got a hold of some lithium primary cells they could put out a few amps at 4.1V. I did a calculation if you put 5000 of them at $10 each into an EV the battery would weigh 600lbs and put out about 250 hp. Weeee! And at $15 each the battery would cost $75k. Cause primary batteries it's $250/mile. 1 years later you had rechargeables with similar specs and cheaper.
I feel that in the 1910-20s when gasoline won the electric technology just wasn't there. People wanted electric cars to succeed buy the economics and performance wasn't there.
The gas piston engine didn't just power cars, it also powered aircraft, armoured vehicles, and trucks. Anyone using electric vehicles by the time World War 2 broke out against a gas piston enemy would've been constantly outmanoeuvred and outgunned. And the logistics chains to bring men and materials to the front of the enemy's front lines would've been far faster then any electric trucks at the time. Especially without the modern day micro controllers that make modern battery management systems possible.
“In 2013, California revised its Zero Emissions Vehicle credit system so that long-range ZEVs that were able to charge 80% in under 15 minutes earned almost twice as many credits as those that didn’t. Overnight, Tesla’s 85 kWh Model S went from earning four credits per vehicle to seven. Moreover, to earn this dramatic increase in credits, Tesla needed to prove to CARB that such rapid refueling events were possible. By demonstrating battery swap on just one vehicle, Tesla nearly doubled the ZEV credits earned by its entire fleet even if none of them actually used the swap capability.”
They sell a tiny amount of cars still, but hit 500k total production last year, which is not insignificant.
If you look at old mobile phones with removable batteries, you'll notice that there is usually a lot of space taken up by the plastic around the battery which is designed to allow a user to replace it repeatedly. A car battery that's rapidly replaceable would need a large, strong structure around it to allow it to be replaced but also to hold together in the event of a crash. If batteries had to be swapped out, you would lose more cabin space and structural rigidity. Then you get to standardised connectors and mountings, data protocols, the list goes on. And that's before you think of the automated equipment to actually swap the batteries.
In a world where we can charge a car today from 10-80% in 10 minutes, it doesn't seem like a worthwhile engineering challenge.
I keep hoping flow batteries can overcome their issues as replacing depleted electrolyte with charged electrolyte is much more like 'refueling' in the current sense of the word.
What's patented? Seems like a ridiculous patent if it entirely covered all practical manner of swapping batteries to recharge an EV.
At some point we are going to have to stop comparing gas and electric cars.
I can't imagine much worse than being on a road trip and quick swapping to a new battery that you discover, after driving away, has significantly degraded performance and range.
Would a standardised battery block in laptops work? The same battery would work in a Frame.work, System76, MacBook air, MacBook pro, a Lenovo Thinkbook and whatever gaming monster there is from Asus.
Sounds stupid, right? It's just as stupid for cars.
And if laptops had battery swapping, would you swap your brand new battery, but empty, to a random one at a swapping station? Would you trust the people and systems that the battery hasn't been tampered with and is in good working order?
There does not have to have a single battery standard, could be s/m/l, like coincell, aaa, aa etc.
> Would you trust the people and systems that the battery hasn't been tampered with and is in good working order?
Do you trust random utilities/charger manufacture?
> new battery, but empty, to a random one at a swapping station.
Would you care if it is within regulated thresholds and you can get another one any time you want?
Incredibly dangerous to put naked electrical connectors right next to something flammable that you can't even extinguish.