[RE-wrenches] Second Life Batteries

[Darryl Thayer]

Thermal Runaway is caused by part of a cell or cells being warmer than
other cells as the cell warms is to voltage drops and the other cells power
into that cell or can be caused by a failure of that cell usually a failure
of a Cell results in a fuse being blown fusible link being blowing a good
way to avoid thermal runaway is to maintain all the cells at the same
temperature with an active cooling system. Systems like the Nissan Leaf use
packs instead of individual cells this greatly reduces the potential for
thermal Runaway however the surge-charge-rate are reduced with this style
of cell. Thermal runaway most commonly occurs on charging however it can
occur on discharging also. As many of us know thermal runaway can occur
with lead acid AGM type batteries and even flooded if too many cells are
placed in parallel.

On Oct 5, 2017 8:45 AM, "Drake" <drake.chamberlin at redwoodalliance.org>
wrote:

> Hello Wrenches,
>
> I've been contacted by a group who will be taking apart lithium ion
> battery packs that have been retired, finding the bad cells and recombining
> the remainder, then putting them in larger configurations for use in PV
> systems and electric vehicles.
>
> How can thermal runaway be avoided? Is there any information that could be
> of use in making these systems safe and effective?
>
> Thanks,
>
> Drake
>
>
>
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