LiPo battery solar charging - Fire Risk?

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LiPo battery solar charging - Fire Risk?

Post by rsatchel » Thu Oct 05, 2017 10:26 am

I am working on a project in which I am using a Sparkfun Lithium Ion 850mAh battery
and wish to charge the battery from some solar cells.

I got some 5V 30mA (each) solar cells ... UTF8&psc=1 and confirmed that they did indeed produce 30mA at 5V in full sun.

I had in my parts drawer a solar lipo charger from DFRobot which uses the CN3063 constant current/constant voltage linear charger IC The schematic is here ... %20SCH.pdf.
The datasheet is here ... CN3063.pdf

However my question is about the Sparkfun battery.
The application is solar powered (charging) bicycle lights. So the battery is shielded from direct sun, but I expect there to be a reasonable amount of conductive heat from the bicycle frame and from the 3D printed case to the battery. I looked over the datasheet ... 1.0ver.pdf
for the battery and saw that it has a charging temperature range of 0-45C.

What happens to the battery if it exceeds the 45C maximum temperature while charging? Will it explode/burn?

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Re: LiPo battery solar charging - Fire Risk?

Post by jremington » Thu Oct 05, 2017 1:43 pm

At 500 mA charging current, the maximum allowed by that charger, the battery won't heat up significantly.

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