Re: [EVDL] Tesla cell size

2017-04-14 Thread Cor van de Water via EV
To: Electric Vehicle Discussion List Subject: Re: [EVDL] Tesla cell size On 13 Apr 2017 at 22:04, Michael Ross via EV wrote: > A cylinder only has to be oriented for polarity, it > can have any radial orientation. We had a rather similar discussion here many years ago (20?) about Optima

Re: [EVDL] Tesla cell size

2017-04-14 Thread EVDL Administrator via EV
On 13 Apr 2017 at 22:04, Michael Ross via EV wrote: > A cylinder only has to be oriented for polarity, it > can have any radial orientation. We had a rather similar discussion here many years ago (20?) about Optima lead batteries, which used (and still use) cylindrical cells. This thread has

Re: [EVDL] Tesla cell size

2017-04-14 Thread Hoegberg via EV
Från: EV <ev-boun...@lists.evdl.org> för Michael Ross via EV <ev@lists.evdl.org> Skickat: den 14 april 2017 04:04 Till: Electric Vehicle Discussion List; Mark Hanson Ämne: Re: [EVDL] Tesla cell size  > Regarding fuses, if you check out some images of pack teardowns you ca

Re: [EVDL] Tesla cell size

2017-04-14 Thread Michael Ross via EV
The larger cell allow​s more cooling surface. I think Tesla has optimized for power density choosing the slightly larger size. Also optimized for manufacturing efficiency. A cylinder only has to be oriented for polarity, it can have any radial orientation. Regarding fuses, if you check out some

Re: [EVDL] Tesla cell size

2017-04-13 Thread Mark Hanson via EV
> > Thanks Mike > It looks like their 18650 cells have only grown slightly. Guess you can't > argue with success. I remember when they were starting in California and I > told a Tesla salesman that that's 6800 points of failure and he said that's > 6800 points of redundancy. I've always

Re: [EVDL] Tesla cell size

2017-04-12 Thread Michael Ross via EV
Like ion cells change volume a significant amount as they charge and discharge. The cylindrical format is really structurally better in this respect- each cell can handle the stress and the pack doesn't have to be designed to take it. Compare to pouch cells which end up in a press to keep

Re: [EVDL] Tesla cell size

2017-04-12 Thread Bill Woodcock via EV
> On Apr 13, 2017, at 3:32 AM, - - via EV wrote: > I haven't heard of any reliability problems related to the cells or their > interconnects. On the first few units, assembled by hand in Asia, they had a lot of problems, which was what drove the development of the robotic

Re: [EVDL] Tesla cell size

2017-04-12 Thread - - via EV
See the following for details: https://www.tesla.com/blog/battery-cell-production-begins-gigafactory I agree that Tesla is the only auto manufacturer using the cylindrical cells, but they are used by the millions in laptops, so the technology is well established. Using the cylindrical cells

Re: [EVDL] Tesla cell size

2017-04-12 Thread Paul Wujek via EV
On 2017-04-12 08:45 AM, Mark Hanson via EV wrote: Is tesla still using 6800 or so of 18650 itty bitty cells in their on road vehicles like the S and model 3? Do they use these small cells in their Tesla Wall home UPS packs as well? I wonder if they'll continue these small cells at their

[EVDL] Tesla cell size

2017-04-12 Thread Mark Hanson via EV
Is tesla still using 6800 or so of 18650 itty bitty cells in their on road vehicles like the S and model 3? Do they use these small cells in their Tesla Wall home UPS packs as well? I wonder if they'll continue these small cells at their giga factory in Reno since *no* other manufacturer is