General > General Technical Chat
Interesting "IC" - QFN SMD battery
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daqq:
OK, not exactly something you can run your Tesla off of, but nice and small. Good for RTCs I guess:
https://www.cymbet.com/products/enerchip-solid-state-batteries/
amyk:

--- Quote ---Environmental friendliness is a key EnerChip attribute, since the product is designed to eliminate battery replacement and last the life of the product it powers
--- End quote ---
What utter BS. Now the "life of the product it powers" is going to be limited by the life of the (very difficult to replace) battery. |O
ConKbot:

--- Quote ---  For example, the 50uAh EnerChip CBC3150 is rechargeable 5000 times at a 10% depth of discharge to 80% of rated capacity.   
--- End quote ---
Pretty bold to call it 50uAH if only 5uAH is usable without trashing the battery.
Nominal Animal:

--- Quote from: ConKbot on October 18, 2020, 07:54:32 am ---
--- Quote ---  For example, the 50uAh EnerChip CBC3150 is rechargeable 5000 times at a 10% depth of discharge to 80% of rated capacity.   
--- End quote ---
Pretty bold to call it 50uAH if only 5uAH is usable without trashing the battery.

--- End quote ---

And how marketing-wankery of them to use "at a 10% depth of discharge" in the hopes of readers believing they meant "to a 10% state of charge".

At least the datasheet says "Charge/discharge cycles: > 5000 times at 10% discharge", which is clearer and less wankery.  And lower down, they do admit that at 40°C, only 500 charge/discharge cycles at 50% discharge.

The only use case I can think of these is when you have a bare die on your board under a blob of epoxy, and want to hide a small battery for RTC/RAM backup there to keep some Super-Secret SauceTM like the most important one, License/Warranty Expiration Date.  You know, to "optimize" device life.
hans:
I think these devices can be interesting, but only for a very niche case. Compared to supercaps at these small dimensions, you can get a few kind of 11mF caps in 1210, but their energy density is an order of magnitude off. At least on paper.., if you don't look at recharge cycles

Not sure if that cell series resistance is anything to be happy with. 5k ohm at 1k cycles, 10k nominal at -20C, ouch! Good luck pulling a few ten uW of a battery in bursts for anykind of energy harvesting/IoT application..
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