coleafrado wrote: ↑
Thu May 28, 2020 1:27 pm
Vacuum sealing before use
is necessary to prevent self-discharge. Some have claimed that it's no longer necessary - at the scale of automotive batteries, that's hard to believe. Do you have any idea how physically and mentally inconvenient it would be to manage a fleet of batteries (each 50-100 kg and costing hundreds of dollars) at various states of discharge just so you can drive around? Completely ridiculous. What works for a watch or a calculator does not work for a car. Maybe rechargeable metal-air batteries will work, eventually. Nonrechargeable cells will never be used for EVs.
Al-air batteries might be "add water before use", or filled with inert gas such as nitrogen, or perhaps even vacuum sealed.
A reasonable use case isn't a "fleet of batteries", but rather a battery used for longer trips. Consider an EV with a hybrid battery:
40kWh of Li-ion for daily driving.
Place for a Al-air battery up to 100kg of AL to be mounted/dismounted in a service station.
Li-ion for daily driving, Al-air for long trips.
2000 Wh/kg so a 100kg battery would give 400kWh for a price of about $200 and a cost of $110.(*) Plus likely a deposit. Now you can do the back roads road trip with 160 mile on rechargeable and 1600 miles on the Al-air. A similar efficiency to hydrogen fuel cells, but a much lower cost. Yes, would likely have a self discharge problem if was the daily use battery. More convenient and capable than DCQC network.