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Discussion Starter #1
Re: [EVDL] Tesla batteries

< Do note that large format NiMH is available right now from Cobasys.
It is costly, but not unobtainium. >

http://www.cobasys.com/footerpages/faq.shtml

If they'll only sell to OEMs, isn't that unobtainium for the rest of us?

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Re: [EVDL] Tesla batteries

[email protected] wrote:

> http://www.cobasys.com/footerpages/faq.shtml
>
> If they'll only sell to OEMs, isn't that unobtainium for the
> rest of us?

Yes, that probably does make it a little difficult to get new modules...
Sorry, I'm working with an OEM and knew only that Cobasys had product
for sale; I didn't realise that they weren't selling to individuals.

Their focus in recent years has been selling NiMH into UPS applications,
so it may still be possible to find ones that have been swapped out.

Another Ni-based option is NiZn. I haven't heard anything from eVionyx
in a while, but they were developing product for EVs and indicated that
the weaknesses of the Evercel product were not shared by theirs.

Cheers,

Roger.

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Re: [EVDL] Tesla batteries

Small format NiMH are available today, and are not costly.
but there is no market for them, i.e. "the rest of us" just won't pay
the higher costs for them vs lead.
Jack

[email protected] wrote:
> < Do note that large format NiMH is available right now from Cobasys.
> It is costly, but not unobtainium. >
>
> http://www.cobasys.com/footerpages/faq.shtml
>
> If they'll only sell to OEMs, isn't that unobtainium for the rest of us?
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>


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Discussion Starter #4
Re: [EVDL] Tesla batteries

Jack Murray <[email protected]> wrote:
> Small format NiMH are available today, and are not costly.
> but there is no market for them, i.e. "the rest of us" just won't pay
> the higher costs for them vs lead.
> Jack

Plus, small format batteries require a much better BMS than large
format batteries. That's what kills it for me.

-Morgan LaMoore

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Re: [EVDL] Tesla batteries

Huh? A much better BMS is a small part of the price of the pack.
Parallel strings of smaller cells provide redundancy. We hear it all
the time, a single battery failure kills off your EV, one melted post
and you coast. See it with the Prius too, was reading how a common
1-cell interconnect corrosion problem causes the entire pack to fail and
the repair shops just replace the whole pack.
You must have heard of RAID, Redundant Array of Inexpensive Disks, less
expensive and more robust than one big disk.
A string fails, and your dash lights up with a Parody error,
hit accelerator to continue.
Jack

Morgan LaMoore wrote:
> Jack Murray <[email protected]> wrote:
>
>>Small format NiMH are available today, and are not costly.
>>but there is no market for them, i.e. "the rest of us" just won't pay
>>the higher costs for them vs lead.
>>Jack
>
>
> Plus, small format batteries require a much better BMS than large
> format batteries. That's what kills it for me.
>
> -Morgan LaMoore
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>


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