Electronics > Projects, Designs, and Technical Stuff

DIY cheap powerbank (technical suggestions R welcome !)

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qnh:

--- Quote from: crazyguy on August 09, 2016, 04:55:00 pm ---very cheap chip

Power Bank SoC
http://www.injoinic.com/english.html

IP5108
Charger Current 2.5A, Boost Converter Output Current 2.1A
http://www.injoinic.com/doc/IP5108_brief.pdf

http://www.gearbest.com/chargers/pp_421906.html?wid=21
http://www.chongdiantou.com/thread-2357-1-1.html

--- End quote ---

 :-+   :-+   :-+

Siwastaja:

--- Quote from: ym58 on August 09, 2016, 06:28:26 pm ---That's just unexpected ... there has been so much blah-blah on this thread

--- End quote ---

I may have saved hundreds if not thousands of your hours by informing you of the problems related to your idea of always charging li-ion cells at 1C (partly based on my own, yet-to-be-published research), and by informing you that Battery University is not a good source for a beginner like you, which you, ignoring my expertise, started to blah blah against without better knowledge. I clearly should have seen at that point that you are not worth replying to.

Designing something is more than just taking a random solution and applying it; understanding the relevant principles is paramount. I always try to stay relevant when talking about said principles, to save everyones time and avoid diverging to unnecessary nitpicking and blah blah.

Everything in this thread has been concrete and important, and if you deny to see it, it's your problem and you'll just face it later.

I didn't feel I need to diverge to charging voltage, but wanted to reply to the claimed premise that Battery University is "just fine" by showing all the severe errors that come up with every graph posted originating from them. If they can't even get the basic voltage profile right, how can you trust them in other aspects, either?

It would have also helped if you could write more clearly. When you keep blah blahing about charging at 1C, and reason it so that you don't have to wait for 12 hours, I logically conclude that you have have been misinformed (by sites like Battery University, for example) that charging at less than 1C takes 12 hours. This kind of misconception is not uncommon; not all people understand C rates at all, and that's all OK, as long as you are willing to learn.

But now I know I don't need to invest any more of my time in you. Thank you and good bye.

Skimask:
^^^^
This
(or is it "That"?)

With that being said, I've been using those cheap ebay PCBs that come with the TP4056 & DW01 along with a bunch (bunch = 12) of relatively equally used 18650's (same brand, same 'color', look to be roughly the same age, etc) for a few months now, with the pack feeding a TPS63001 prototype PCB upconverting to 5V @ ~1A, connected to a 4pk of USB-A plugs.  Takes forever to charge the whole thing if it's dead-dead, but lasts forever (maybe slightly less) on a charge.  12x ~2200mah 18650's = a bit less than 100WH...for the cost of some junk :D
Pictures to follow...(Don't expect too much.  It's thrown together with duct-tape, bailing wire, and clothespins.  Someday I'll find that fire-proof for the thing...just in case)

ym58:

--- Quote from: crazyguy on August 09, 2016, 04:55:00 pm ---very cheap chip
Power Bank SoC
http://www.injoinic.com/english.html
IP5108
Charger Current 2.5A, Boost Converter Output Current 2.1A
http://www.injoinic.com/doc/IP5108_brief.pdf
http://www.gearbest.com/chargers/pp_421906.html?wid=21
http://www.chongdiantou.com/thread-2357-1-1.html
--- End quote ---

Hello Crazyguy,
A few questions :







Thanks !

ym58:

--- Quote from: Skimask on August 10, 2016, 06:49:48 am ---^^^^
This
(or is it "That"?)
--- End quote ---
:clap:


--- Quote from: Skimask on August 10, 2016, 06:49:48 am ---With that being said, I've been using those cheap ebay PCBs that come with the TP4056 & DW01 along with a bunch (bunch = 12) of relatively equally used 18650's (same brand, same 'color', look to be roughly the same age, etc) for a few months now, with the pack feeding a TPS63001 prototype PCB upconverting to 5V @ ~1A, connected to a 4pk of USB-A plugs.  Takes forever to charge the whole thing if it's dead-dead, but lasts forever (maybe slightly less) on a charge.  12x ~2200mah 18650's = a bit less than 100WH...for the cost of some junk :D
Pictures to follow...(Don't expect too much.  It's thrown together with duct-tape, bailing wire, and clothespins.  Someday I'll find that fire-proof for the thing...just in case)
--- End quote ---
We're in the same boat together, buddy ... trying to make practical things from scrap/junk without spending a dime :-/O
Awaiting your pics.


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