On Mon, 10 Jan 2022 05:27:26 -0000 (UTC), danny burstein
<
dan...@panix.com> wrote:
>In <
q23ntg5lrilplci9d...@4ax.com> Jeff Liebermann <
je...@cruzio.com> writes:
>
>[lots snipped]
>
>>"Explosion Hazards from Lithium-Ion Battery Vent Gas"
>><
https://www.osti.gov/servlets/purl/1574807>
>
>>The article goes on to detail which gasses are produced, under what
>>conditions, and in what proportions, which changes depending on SOC
>>(state of charge).
>
>Thanks. That article (which, despite coming through Elseveir,
>is a freebie) is *exactly* the background info I was looking for.
OSTI (US governmint office of scientific and techy info) apparently
contracted with Elseveir to handle their distribution. I forgot to
mumble something about the article search:
<
https://www.osti.gov>
They have 23,135 articles listed under "lithium ion battery safety"
keyword search:
<
https://www.osti.gov/search/semantic:lithium%20ion%20battery%20safety>
or 147 under the exact phrase:
<
https://www.osti.gov/search/semantic:%22lithium%20ion%20battery%20safety%22>
The first article found is rather interesting:
"Materials for lithium-ion battery safety"
<
https://www.osti.gov/servlets/purl/1475493>
This Review aims to summarize the fundamentals of
the origins of LIB safety issues and highlight recent
key progress in materials design to improve LIB safety.
>So they seem to agree with me. In a residential setting with
>a couple of e-bike batteries, the fire risk is almost entirely
>from "thermal runaway" and not gas production/escape.
In my never humble opinion, the more likely eBike scenario is
mechanical damage, either from modifying or soldering the battery pack
cells, or having the eBike crash into something. Also included are
high resistance contacts causing the safety fuse to fail to trip, BMS
(battery management system) misprogramming or miswiring, and various
attempts to convince the eBike to deliver more power. Locally, I've
only seen 3 eBike fires and have been told about 3 others. All were
the result of owner tampering, shoddy repair, cell replacement, or
combinations of these. A commercial eBike system is probably fairly
safe. A do-it-thyself mess of mods and repairs is probably not so
safe.
Hint: Store your batteries in a fireproof box, preferably with a
working smoke alarm nearby:
"Underrated E-Bike Battery Fire Hazards Call for Attention on Safe
Storage"
<
https://www.bike-eu.com/home/nieuws/2018/02/underrated-e-bike-battery-fire-hazards-call-for-attention-on-safe-storage-10132804>
Methinks things will be better when the cobalt cathode are replace
with LiFePO4 cells.