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1) Tesla likely secured a good deal for Panasonic batteries, as I think some of them were co-designed, like the latest bigger 207000 battery cell. From what I'v
by mtgx 9y ago
1) Tesla likely secured a good deal for Panasonic batteries, as I think some of them were co-designed, like the latest bigger 207000 battery cell. From what I've seen in past articles, Tesla always had the cheapest battery packs per kWh.
2) Tesla also likely has a significant advantage in battery pack architecture, from safety (they offered to teach Boeing how to design battery packs so their EV planes don't catch fire a couple of years back), to withstand more extreme weather conditions (hot or cold), to having an industry-leading battery degradation performance. I think I've seen reports of Tesla batteries only losing 4-5% of charge capacity after 100,000 miles.
- mschuster91 9y ago> I think I've seen reports of Tesla batteries only losing 4-5% of charge capacity after 100,000 miles. That one is easy to do with overprovisioning - similar to SSDs and I believe even HDDs do this to account for inevitable degradations during operation.
- rsynnott 9y agoTesla was always an oddity in using such small cells (18650s) in the first place. A Model S has thousands of cells; a Renault Zoe, say, has 192. The 20700 is rather similar to the existing, and fairly old, 26650. Tesla may well have interesting battery technology, but it’s not the cells; they’re nothing very special.
- jdietrich 9y agoIMO it's a deliberate choice - 18650s have a much higher surface-to-mass ratio, so are much easier to cool. For a car like the Model S, thermal management of the battery pack is one of the key limits on performance.
- lafar6502 9y agoYep the universe conspires to prove something... even that ordinary battery turns info a pinnacle od battery-goodness when Tesla touches it