>
> 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 had it beat into my pointy
> engineering head to minimize component count but with embedded fuses in each
> cell that's probably a good recipe although no other manufacturers are doing
> it.
> Best regards
> Mark
>
> Sent from my iPhone
>
>> On Apr 12, 2017, at 3:26 PM, Michael Nickerson <mikenickers...@gmail.com>
>> wrote:
>>
>> It looks like it. In the link below they describe them as "2170 cells" but
>> I think they are a similar format.
>>
>> 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.
>>
>> It seems to be working for them. I haven't heard of any reliability
>> problems related to the cells or their interconnects.
>>
>>> On Apr 12, 2017 6:45 AM, "Mark Hanson via EV" <ev@lists.evdl.org> 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 giga factory in Reno since *no* other manufacturer is
>>> doing so.
>>> Best regards
>>> Mark
>>>
>>> Sent from my iPhone
>>>
>>> > On Apr 10, 2017, at 4:04 PM, via EV <ev@lists.evdl.org> wrote:
>>> >
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>>> > Today's Topics:
>>> >
>>> > 1. Re: EVWest Tesla Module Prices? (tomw via EV)
>>> >
>>> >
>>> > ----------------------------------------------------------------------
>>> >
>>> > Message: 1
>>> > Date: Mon, 10 Apr 2017 09:54:12 -0700 (PDT)
>>> > From: tomw via EV <ev@lists.evdl.org>
>>> > To: ev@lists.evdl.org
>>> > Subject: Re: [EVDL] EVWest Tesla Module Prices?
>>> > Message-ID: <1491843252861-4686360.p...@n4.nabble.com>
>>> > Content-Type: text/plain; charset=us-ascii
>>> >
>>> > Iirc in the 85kWh pack there are 16 modules, each module has 6 series
>>> > connected groups of 74 cells in parallel, so full charge of one module is
>>> > 6*4.2V = 25.2V, and capacity is about 240Ah. Most modules seem to go for
>>> > around $1200 when sold by individuals, and they usually tell you the year
>>> > and mileage of the vehicle they were taken from. Might be more cost
>>> > effective to buy a wrecked Tesla S with low miles since there seem to be
>>> > ample buyers for the drive train, the value of the glass, and scrape value
>>> > of the aluminum body should be considerable, and you could sell the
>>> > modules
>>> > you don't use.
>>> >
>>> > There are two difficulties with Tesla modules imo:
>>> >
>>> > 1) The larger the unit size the more difficult packing different battery
>>> > box
>>> > volumes becomes. These are quite large, module length with cooling tubes
>>> > is
>>> > 26.75", width is 11.8", generally resulting in inefficient use of volume.
>>> >
>>> > 2) The larger the voltage unit, the less flexibility in pack voltage due
>>> > to
>>> > limits of controller/motor max/min input voltage. Voltage of these is
>>> > quite
>>> > large, 25.2V full charge. So for example 7 modules in series
>>> > exceeds max voltage for the Curtis 144V AC controller with max 170V input
>>> > since at full charge they would be 176.4V, although if you give 20 min or
>>> > so
>>> > after full charge for the cells to "relax" in voltage before closing the
>>> > contactor to the controller it shouldn't be an issue, and much of the time
>>> > you could just do a partial charge. Six modules do not make full use of
>>> > the
>>> > voltage range of the controller, limiting peak power. Higher voltage
>>> > motors
>>> > that require > 300V have a different problem in that they require many of
>>> > these modules in series, making it difficult to fit enough modules in a
>>> > converted vehicle to supply the required voltage.
>>> >
>>> > --
>>> > View this message in context:
>>> > http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVWest-Tesla-Module-Prices-tp4686358p4686360.html
>>> > Sent from the Electric Vehicle Discussion List mailing list archive at
>>> > Nabble.com.
>>> >
>>> >
>>> > ------------------------------
>>> >
>>> > Subject: Digest Footer
>>> >
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>>> >
>>> > ------------------------------
>>> >
>>> > End of EV Digest, Vol 54, Issue 11
>>> > **********************************
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