Hi Bob etc,
Consumer Reports said while they loved driving a Tesla model S, they gave it
a poor rating on reliability and preferred the Leaf and now the Bolt, saying
"you'd be nuts not to consider a Bolt". Elon Musk/Tesla is the *only*
company that's putting 6800+ 21mm X 70mm itty bitty cells together in a
large EV. When they came out with the Roadster in California, I asked a
Tesla salesman about the long term reliability of 6800 points of failure and
he said "don't think of it as 6800 points of failure, think of it as 6800
points of redundancy". Good spin. Either they know something that *no*
other large scale vehicle manufacturer/engineering teams doesn't, or their
long term reliability/profitability will continue to be poor. Knowing what
I know about electronic componentry, I'll put my money on large format cells
for large on road EV's, Bolt, Leaf, Smart, BMW etc.
Note for further info, see: www.Batteryuniversity.com EV battery
comparisons/lithium chemistries LMC Cathode, vs LiFePO4 & aluminized cathode
(tesla type) cells.
Best regards,
Mark
Date: Fri, 7 Sep 2018 18:00:28 -0400
From: Robert Bruninga <bruni...@usna.edu>
To: Electric Vehicle Discussion List <ev@lists.evdl.org>
Subject: Re: [EVDL] Fwd: A comparative efficiency study of ... now
Redundancy!
Message-ID: <eb6dd1286c6f8c8ea943f10d95bf3...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
> I've always had it beat into my pointy engineering head to minimize
> component count. Which is also why id never own a Tesla with 6800 or
> so cells in their battery.
That philosophy fails to recognize the value gained in multiple redundancy.
The Tesla battery of 6800 cells is far more reliable since it has 74 cells
in PARALLEL for each 3.6volt lithium unit. Compared to a Leaf with only 2
cells in parallel at each stage in the stack.
IN the Tesla the impact on any single battery failure is then only 3% of the
impact of a cell problem on a car with larger format cells.
I'd take the multiple redundancy of the Tesla any day.
Bob
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