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Loads of details: Cost-effective EV battery passes German tests, recharges in minutes
The cost seems too good to be true.
http://www.energizerresources.com/index.php?option=com_content&view=article&id=421&Itemid=206One of the most compelling break-throughs illustrating how Vanadium, when combined with lithium, creates “supercharged” batteries is the recent news by Germany’s DBM Energy. In partnership with German utility Lekker Energie, DBM Energy equipped an Audi A2 electric vehicle with its new lithium-Vanadium metal polymer battery and set a long distance record of 603 kilometres (375 miles) travelled on a single charge. The battery’s basic electro-chemistry consists of a metallic lithium anode and a Vanadium oxide cathode. DBM Energy claims the battery has 97% efficiency and can be charged at virtually any electrical socket. Plugged into a 240-volt direct-current source, the battery can be fully charged within 6 minutes.
Would a 171 Wh/kg 98.9 kWh pack fit in the spare tire area of an A2? That would be a 578kg, 1274lb pack! I think the A2 might have it's front wheels off the ground. At 282 Wh/kg that's a 350kg, 770lb pack.
It seems as if the secret ingredient may be Vanadium
Plugged into a 240-volt direct-current source, the battery can be fully charged within 6 minutes
It was all going so well until this
At what astronomical current?
600 kW has been mentioned. (Other places talk about 10 min for 95%).
600 kW... 240V... 2500 Amps??? Not bloody likely! That kind of current requires solid copper bus bars at least 1.25 inches square. I can only imagine how big the cable would be!
“Regarding the recharging time we use internal our own Power Bricks, an energy storage system, with 600 kW, Röser said.
It was all going so well until this
Plugged into a 240-volt direct-current source, the battery can be fully charged within 6 minutes
At what astronomical current?
Personally, I decided to believe 171 Wh/kg, but consider everything else to be theoretical values, or unsafe prototypes, until independently proven otherwise.
http://gm-volt.com/2011/04/12/cost-...reportedly-passes-tests-recharges-in-minutes/With a 300 kg battery pack of 98 kWh we reach a distance of 600 kilometers without a stop and without a gas engine or range extender.”
http://gm-volt.com/2011/04/12/cost-...reportedly-passes-tests-recharges-in-minutes/
That's a pretty specific number from DBM and a lot closer to the 282 wh/kg number than 171 wh/kg.
There seems to be a lot of lost in translation here...
http://www.diyelectriccar.com/forums/showpost.php?p=248507&postcount=109(energy density of the 100kWh car)
The so called lekker-mobile had a battery density of 282 kWh. The battery weight was about 350kg. Newer cars e.g. the silver-arrow (the one with which DBM passed the BAM and DEKRA tests) has an energy density of 171 kWh. Over all there seems to be at least 3 different versions of the battery (one other used in forklifts has around 140 kWh). But the exact energy density is one of the open questions...
A person who claims to have done some investigating just posted over at DIY:
http://www.diyelectriccar.com/forums/showpost.php?p=248507&postcount=109
If it's a DC source I don't see why they have to go with a standard voltage. Most likely it'll be something like 350-450V so it matches the charging voltage of the battery.
The 500kW charger for the Proterra bus uses huge bars and also a ESS as a buffer. Doesn't seem very practical for a car.
http://www.proterra.com/index.php/products/productDetail/C23/
For cars, I think 250kW is about the max practical fast charging power.
I believe pressw0rds is his blog, so it's his information that he gathered independently.The person is getting the information from the same blog which I have already referenced earlier, pressw0rds
It is not an independent "investigation".
I believe pressw0rds is his blog, so it's his information that he gathered independently.
1. Lekker-Mobil (burned down due to an arson attack)