Doesn't Lee Hart's "Batt Bridge" do this?
Seems like it monitors cell behavior (impedance, voltage) and
continuously compares it with the group behavior.
Wouldn't the Batt Bridge be prior art?
Seems like it to me.
Bill D.
On 1/7/2017 10:32 PM, Cor van de Water via EV wrote:
I read the claims of the Patent (which is the meat of the invention)
and while I understand that you can establish parameters for a pack and
determine for example loss of a single cell in a parallel configuration
in a number of ways, for example because that set of parallel cells will
have lower capacity than the other (series connected) sets, so the
voltage of the set with one less (functioning) cell will rise and fall
faster with SoC;
it is also possible to determine (increase of) impedance of a set of
parallel cells by monitoring the short-term voltage variation correlated
with changes ("transient" in terms of the patent) in the current flowing
through the cells (from acceleration and regen or charging start/stop),
but I do not understand their claim that they determine an overcharge
event by finding a *lower* impedance of the cell than normal ????
All data that I have seen show that pack impedance goes *up* at the low
and the high end of SoC, so how can they determine overcharging from
lowered impedance???
Unless the Panasonic/Tesla cells react differently to overcharge than
other chemistries.
For over*dis*charge they do expect and detect a rise in cell impedance.
After Claim 9 we find the usual stuff for a Lithium-ion battery with BMS
that balances cells, the only really new thing that this patent seems to
claim is the *de*crease of impedance during overcharge and the fact that
it uses an independent system for the over- and under-charge threshold
detection so that if the main BMS fails and balancing is unavailable, at
least this backup system prevents the battery from over- and
under-charge so the car can continue to be used (and driven to the
service appointment) with the main BMS out.
This fact of a backup BMS as well as the *lowered* impedance measured to
represent overcharging was probably never claimed before and thus it is
possible to get a patent on this, but I find this a very flimsy basis
for a patent.
It is always possible that I misunderstood the patent - reading and
interpreting claims is never easy stuff but I have a bit of experience
;-)
Cor van de Water
Chief Scientist
Proxim Wireless
office +1 408 383 7626 Skype: cor_van_de_water
XoIP +31 87 784 1130 private: cvandewater.info
http://www.proxim.com
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-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Lee Hart via EV
Sent: Saturday, January 07, 2017 3:59 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] TESLA - Patent Issued for Transient Detection of an
Exceptional Charge Event in a Series Connected Battery Element
Danny Ames via EV wrote:
Yet another advanced strategy Tesla has come up with to keep Li
battery packs from thermal run away and charge safely and quickly.Danny
Patent Issued for Transient Detection of an Exceptional Charge Event
in a Series Connected Battery Element (USPTO 9529048)
Man, they sure make it difficult to tell what (if anything) is new or
any different than what people have been doing for decades.
Can anyone find anything in here that's actually a new invention?
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