If fast charging stations had there own large bank of batteries, they could "slow charge" their batteries from the grid, but could then "dump charge" from their batteries to a customer's car battery. Ie the jumper-cable concept.
The station batteries would have to be useful for many cycles, and there would have to be some sort of current limiting device to control the charge rate to match the capability of the car battery... They would also have to communicate the "full" DC voltage to match the car... Think heavy DC cables with a spark-controlling on-off switch to initiate the dump.
Ideally if batteries could handle a very high charge rate, then charging would only take a minute or so (comparable to or better than filling your tank with gasoline). Even faster than battery swapping schemes.
Ideas? Has this been done?
What would be the charging times for popular batteries (ie are charge rates even posted - would impulse discharge rates apply)? TS200AH cells have a 20C impulse discharge rate (4 kA) - that would mean charging in 1 hour divided by 20 = 3 minutes!
Garth
The station batteries would have to be useful for many cycles, and there would have to be some sort of current limiting device to control the charge rate to match the capability of the car battery... They would also have to communicate the "full" DC voltage to match the car... Think heavy DC cables with a spark-controlling on-off switch to initiate the dump.
Ideally if batteries could handle a very high charge rate, then charging would only take a minute or so (comparable to or better than filling your tank with gasoline). Even faster than battery swapping schemes.
Ideas? Has this been done?
What would be the charging times for popular batteries (ie are charge rates even posted - would impulse discharge rates apply)? TS200AH cells have a 20C impulse discharge rate (4 kA) - that would mean charging in 1 hour divided by 20 = 3 minutes!
Garth