By the way, Valance was bought out by Lithium Werks
https://www.globenewswire.com/news-release/2018/02/07/1335508/0/en/Lithium-Werks-Acquires-Valence-Technologies-Inc.html
AUSTIN, Texas, Feb. 07, 2018 (GLOBE NEWSWIRE)
Lithium Werks B.V. (www.lithiumwerks.com), a fast growing lithium ion
battery and portable power solutions group, announced today that they
have acquired substantially all the assets of Valence Technologies, Inc.
(www.valence.com) including the customer relationships, global
manufacturing, sales and distribution locations along with all of
Valence’s Proprietary Lithium Magnesium Iron Phosphate intellectual
property (IP), trademarks, and inventory.
Peri
------ Original Message ------
From: "paul dove via EV" <ev@lists.evdl.org>
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Cc: "paul dove" <dov...@bellsouth.net>; "EVDL Administrator"
<evp...@drmm.net>
Sent: 08-Jun-20 4:45:53 AM
Subject: Re: [EVDL] Variac and diode bridge to charge LiFEPO4
Valance batteries already have a BMS built in. In addition, LiFePO4 cells have
the highest thermal runaway temperature I believe it’s 250C so much safer than
other chemistries. We overcharged one for 4 hours one time as a test. It melted
the plastic casing and vented but never caught fire. I have a video of it I can
post. Not to say they can’t go into thermal run away but much less likely. Just
because an engineer developed a BMS does not make it good. It was an engineer
that designed the lap top batteries that caught fire as well. Pick a product
that’s got a good track record and has been around a while. I think wiring is
much susceptible to fire and with a BMS you have many more connections. Pay
close attention to details when connecting a BMS.
Sent from my iPhone
On Jun 7, 2020, at 11:59 PM, EVDL Administrator via EV <ev@lists.evdl.org>
wrote:
Lithium batteries have an insane amount of energy in a small space. A
little carelessness or ignorance and they can burn your house down, maybe
with you and your family inside.
You prevent lithium disasters with close and redundant battery monitoring.
If you're a really good engineer, you can design that yourself (but you may
have some near-disasters along the way). If you're a shadetree mechanic
like you or me, you can buy it. But buying a BMS mainly on price is - let's
say - a rather risky move.
Lawrence, a lot of I read from you in your posts is such words as
"inexpensive" and "cheap." Budget hacks can get expensive fast if they
catch fire. Not to be an alarmist, but I'm sure you don't want to become a
"SF EV Hobbyist Dies in House Fire" headline.
I suggest that you spring for a proven lithium battery *system* designed by
someone who knows his or her stuff, and made by a qualified manufacturer
that isn't some here-today-gone-tomorrow Chinese sweatshop. As far as I
know, your Valence batteries are one such system.
If you're not willing to spend a reasonable amount on a safe lithium battery
system, then please stick with good old lead batteries. Bob Rice's infamous
"Trojan Teakettles" notwithstanding, they're a lot less likely to hurt you
when they're mistreated.
David Roden - Akron, Ohio, USA
EVDL Administrator
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