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Thread ID: 150575	2022-04-05 00:53:00	Buy EV's they say, save the planet	wainuitech (129)	PC World Chat

Post ID	Timestamp	Content	User
1485365	2022-04-06 01:29:00	Replacement tyres seem to be the bigger issue with decent EVs, due in part to the increased weight from the large battery, and the brutal accelleration they are capable of which scrubs the tyres down faster. People assume traction control reduces tyre wear, but that's not entirely correct. Just coz the rubber isn't screaming doesn't mean it's not rubbing hard and wearing quickly.	Paul.Cov (425)
1485366	2022-04-06 02:49:00	US agency opens probe into electric vehicle batteries www.stuff.co.nz	zqwerty (97)
1485367	2022-04-06 05:15:00	US agency opens probe into electric vehicle batteries www.stuff.co.nz Thats a worry, so many manufacturing defects . Whats really dangerous is Tesla's self drive mode . I dont know how they are able to get away with having that in a car , especially early on when you could jump in the back seat for a nap & let the car drive itself . Garages will need specialized gear & Techs to service EV's . It could be the end of the local garage doing repairs once EVs really start to take over . Add to that , Companies like Tesla deliberately make it hard for 3rd parties to do any sort of repair or buy parts . Tesla wanted $16,000 to fix a plastic water hose connection . youtu.be So thats another thing making it uneconomic for those that cant afford near new EV's . Im not Anti EV Would love an EV . cant afford one .	1101 (13337)
1485368	2022-04-06 07:17:00	You do the maths, a 400 volt main supply is obtained by putting a large number of 3Volt cells in series with each other, well over a hundred, now think of your lead acid battery in the car you drive with 6 x 2.2 volt cells in series, there are problems with these well-known cells as the batteries age and the originally well-matched cells diverge in parameters and start to destroy the weakest cells in the battery in normal operation. How much worse this will be with the Lithium batteries in an electric vehicle. Lithium battery cells are quite closely monitored during dis-charge and charge, down to 10% and up to 90% this has to be done on each cell individually, a great deal of complexity. This is what Tesla changed to increase safety and as a result lower mileage on each charge. The fire risk is another unique problem with so many cells all packed together in a large metal box underneath your feet in the car and subject to vibration and temperature variations let-alone a large head-on collision/crash with another electric vehicle, say. Think about the ramifications of what I have written above.	zqwerty (97)
1485369	2022-04-06 21:14:00	They use load balancing so the voltage issue isn't much of a problem, but they still do eventually wear out and become useless just like any old battery. I wonder how much carbon is released when an EV burns down vs emissions from an ICE? That'd be an interesting study.	Agent_24 (57)
1485370	2022-04-07 00:07:00	One study I saw, from US insurance claims, was that EV's have approx the same no of fires as petrol cars , as a % per 1000 of EV & per 1000 of Petrol . That may change as they age , become cheaper & arnt maintained	1101 (13337)
1485371	2022-04-07 00:15:00	The battery for a large pack EV is typically stretching from behind the front wheels to in front of the rear wheels, and then stretching from side to side, roughly matching the area of the cabin footprint. For a collision to directly damage the battery it would be most vulnerable to a side impact (T-bone or slide into a tree/pole). A frontal impact would have to squash more than the length of the bonnet before the battery space gets involved. An impact of that magnitude in a combustion vehicle would shove a screaming hot engine up against the front row occupants, along with all that crushed and twisted metal... think I'd rather have a full frontal in an EV any day. Teslas are also designed to throw the front motor and diff beneath the footwell in the event of an impact that hard. LFP batteries (the cheaper ones that don't suffer the same balance/ingnition/fire issues) don't burn easily, and the battery pack would likely be the last part of the car to go up in flames. The upcoming Tesla 4680 battery design features a pressure relief plug in the base of the battery to let them vent rather than popping off like fireworks as happens with burning Lithium cobalt varieties.	Paul.Cov (425)
1485372	2022-04-07 03:03:00	The upcoming Tesla 4680 battery design . Are EV's still using Round consumer type cells in their batt packs. Wouldnt larger flat packed cells be vastly superior, less wasted space , less wasted weight on packaging small cells . Lithium batts for RC are all flat packed cells , bundled small round cells simply arnt used . As for safer lithium batts, LiFePO have been around for some time and dont want to catch fire . Ive a few of those at home . They dont they the same power though .	1101 (13337)
1485373	2022-04-07 05:06:00	Are those batteries going to remain stable!, or is the weight going to be transferred forward/upward!, and is there enough accident data on EVs' yet?. Just asking. lurking.	Lurking (218)
1485374	2022-04-07 06:09:00	Are EV's still using Round consumer type cells in their batt packs. Wouldnt larger flat packed cells be vastly superior, less wasted space , less wasted weight on packaging small cells . Lithium batts for RC are all flat packed cells , bundled small round cells simply arnt used . As for safer lithium batts, LiFePO have been around for some time and dont want to catch fire . Ive a few of those at home . They dont they the same power though . BYD, a Chinese EV company has actually recently shown a design of a flat battery based on LiFePO4, called the "Blade Battery" which IIRC Tesla was interested in using. Not sure the current state of it though, when or if it will be in production. The batteries in the Prius are already square shapes AFAIK.	Agent_24 (57)
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