Any Tesla 18650 data sheets available from years gone by?

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brumbrum
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Any Tesla 18650 data sheets available from years gone by?

Post by brumbrum » Dec 04, 2017 2:10 pm

Is there any info out there that correctly states how tesla car cells may have been different to average Panasonic 18650 cells?
And is there any official data stating the AH and discharge rating of any of the tesla cells used over the past 6-7 years in their cars?

I need to know whether if it is worth pursuing a purchase of these types of cells with consideration to their age/shelf life/capacity and C rating according to year of manufacture.

Anyone have any knowledge of information to share?
Cheers :D

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Re: Any Tesla 18650 data sheets available from years gone by?

Post by Hillhater » Dec 04, 2017 4:09 pm

I doubt you will find any "official Tesla" spec sheets or published data, ... But there is plenty of test data from reliable sources on this site.
Try the Search function.
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Re: Any Tesla 18650 data sheets available from years gone by?

Post by brumbrum » Dec 04, 2017 5:41 pm

Thanks, yeah i did a bit of digging on here and elewhere on the web. It seems there have been at least a couple of differing cells used over the years. It would be nice to know how the cells differ from the standard panasonic cells of equal capacity and discharge. I have seen test claims stating from 6,8,10 and 12amp continous draw, but also as being able to maintain much higher and longer peaks than the 'usual' 18650's and having a longer shelf life even when abused. So whats the secret recipe? And is this recipe not used elsewhere purely due to design obsolescence?

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Re: Any Tesla 18650 data sheets available from years gone by?

Post by Hillhater » Dec 05, 2017 12:02 am

Tesla's cells are not very high performance cells.
There are many 18650's with much higher discharge ability, some with more capacity,
Tesla's real advantage is their long cycle life with minimal capacity loss together with an aparent ability to tolerate low discharge voltage levels.
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Re: Any Tesla 18650 data sheets available from years gone by?

Post by Cephalotus » Dec 05, 2017 7:42 am

brumbrum wrote:
Dec 04, 2017 5:41 pm
So whats the secret recipe?
Faith.

Tesla cells are Panasonic technology, there is no magic about them and nothing involved that Panasonic is not able to use in their own cells.

Afaik the Tesla cells lack the shrink warp, lack the usualy built in security feature (CID?) and maybe their cell can wall is a bit thinner (?)

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Re: Any Tesla 18650 data sheets available from years gone by?

Post by Hillhater » Dec 06, 2017 6:59 pm

"Tesla" cells can be a bit missleading.
Whilst they have been using mainly cells made and supplied by Panasonic, made to Tesla's spec, it is known that they have also used cells from LG, Samsung, Sanyo (now part of Panasonic) and likely others also.
The only cells Tesla have actually manufactured themselves are the 21700 size used in the Model 3 and some of the Storage system modules ( though they have also used other suppliers for those 21700s too !)
Testing has shown the "Tesla" 18650 is near identical in performance to the Panasonic BE spec cell .
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Re: Any Tesla 18650 data sheets available from years gone by?

Post by jonescg » Dec 06, 2017 9:05 pm

The critical thing for longevity of any 18650 cell is cooling - Tesla's cooling system is rather good, and it strives to maintain the cells at a constant 25'C (+/- 5'C) for as much of the cells life as possible. Pretty much any cell will live a long life if thermally managed.
So yeah, there's nothing particularly special about Tesla's cells - they just treat them nicely.

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Re: Any Tesla 18650 data sheets available from years gone by?

Post by brumbrum » Dec 09, 2017 3:06 pm

jonescg wrote:
Dec 06, 2017 9:05 pm
The critical thing for longevity of any 18650 cell is cooling - Tesla's cooling system is rather good, and it strives to maintain the cells at a constant 25'C (+/- 5'C) for as much of the cells life as possible. Pretty much any cell will live a long life if thermally managed.
So yeah, there's nothing particularly special about Tesla's cells - they just treat them nicely.
Thanks,, that makes it clear. Constant optimum temperature is the special sauce, not something in the cell constuction itself. Thanks guys.

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