vallorn said:
Alandoril said:
Shame that whilst capitalism exists in its current form this kind of technology will go to waste.
why are you blaming Capitalism? its Monopolies, Vested Interests and Nuke hungry Governments that keep this from being made.
manaman said:
snipped for obvious brevity
i worked out a profitable system where cars have removable battery units and are charged at gas stations. these charged cells are then swapped with non charged cells to refuel thus removing the need for home charging equipment and long charge times.
i would upload i diagram which explains it better but i dont know how...
What fuel station in their right mind would face the possibility of exchanging nearly depleted cells for brand new cells?
What customer is willing to face the surprise of only getting half the travel distance they just got with their battery pack in their brand new vehicle?
Do you realize just how much the battery packs weigh?
Even if they used modular battery packs to facilitate different sized vehicles and slightly ease the removal of the already substantially heavy batteries they would run into issues where the more depleted packs would draw down and prevent the less depleted packs from charging fully in the vehicle. The more depleted packs would reach capacity and a higher voltage quicker increasing the overall voltage of the packs, lowering the charging current to the rest of batteries, eventually casing the voltage to reach the charge voltage while the good cells would have had little chance to take a full charge. This would only decrease the life of the packs, and substantially impact total travel distance.
How do you stop those customers that abuse the system by depleting the battery pack through use at home then heading over to a fueling station when the pack has less then 50% capacity and getting a different battery to do the same thing with? Do you remove the home charging option? Seems pretty lousy to be forced into a battery swap program. What if you then move to an area that is only supplied by competing stations?
Then you have battery downtime to consider. Every moment that the battery spends in a fueling station costs that station money. Li-ion battery packs have a limited shelf life because the same process that causes them to deplete during charging causes them to deplete just sitting there, at a much slower rate to be sure, but they still have a limited shelf life. Not the best scenario for Bump-In-The-Road, Middle-of-Nowhere stations, where the batteries could potentially sit for a quarter of their life.
This still doesn't even address all the other concerns, the disposal of waste battery packs, the relative scarcity of lithium that will quickly become apparent if we try to replace all 500,000,000 cars on the road today with electric cars, the weight to capacity ratios, and all the others brought up and ignored in the post you quoted.
In case you are wondering Li-ion batteries deplete (lose capacity) because deposits are formed in the electrolyte with each charge-discharge cycle. Improperly charging the battery, over charging especially can speed up this process, but discharging the battery beyond recommended amounts will also speed up the process. These deposits serve to increase the internal resistance of the battery which lowers the current capacity of the battery. The high temperatures the battery can reach during rapid charging and discharging are by far the most problematic as these temperatures rapidly increase the rate at which these deposits form.
No offense but I am not sure you have enough knowledge of batteries and charging systems to properly work the major bugs out of a system like that, I would be interested in seeing the diagram however, but I am not sure why you can't describe the process since you stated you worked out the process.