Beginners Guide to Processing 18650 Cells | Cell Database


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CRUD's Powerwall Project
#11
If they are 0v or close, most chargers don't recognize them. just put in parallel in the charge, for few seconds another cell full charged (for that I let some nickel strip on some cells so it's easy to slide between charger terminal and the battery to "jump start").

After you jumpstarted a cell, the charger should start it's process, remove the other cell when voltage is above 1-1.5v, if the cell drop to 0v and charger stop working throw it, it's probably vented.

If cell become hot quicly, throw it, it's probably shorted.

The cell you use as starter can be hot after starting few cells, it's better if you have high discharge cells to do that, or you just let it cool down and use another one. I still use the sames ones for month, and they are junk <1000mAh.

A lot of theses 0v cells went low because of bad BMS or another cell who drained the entire pack and are still good, but keep and eye when slow charging them and throw the ones who became hot. After the charge/test/charge cycle or only charge, let them a few days and check voltage to seek for self-discharging cells.

I salvaged a lot of 0v cells who are in better conditions than some initialy at 4v.
kazbach likes this post
Current setup: 21x 215wc poly, 7.5kWh 7s 18650, PIP 2424msxe.
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#12
Note that if they dont take charge at all the CID is most likely popped and recomendation is to throw them. (The CID popped due to a reason)
coolfx and Korishan like this post
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#13
Very interesting! Thanks a lot for the details.

Indeed, the BMS did some damage (at least what the seller told me).

I'll try to jumpstart in a save environment and doublecheck the cells.

I actually had some cells below one volt. Some did refresh, some stayed at 6-20 mAh after charging.

I currently use some of the cells with the refresh program of my chargers. I'll check on that when i get back from work this evening.

Best
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#14
So still testing cells :-) Got a lot of good (and bad) cells out of the pile:




... another 200 to 300 Cells resting inside laptop and e-bike batteries waiting to be tested ...
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#15
Today i received a piece of 0,5 mm copper sheet for developing my cell connectors. Just a cheap piece of copper. For the final busbar i'll use Cu ETP which is the 
kind of copper used in electronics and has the lowest resistance. A little bit more expensive, though.

I recently got back to my idea about creating a solderless batterypack. As mentioned earlier, i am going to combine both solderless (for the bottom/negative connection) and soldered, using the common way of having a busbar connecting to the positive terminal of each cell using fuse wire.

So today i just made one connector - very roughly and by hand - just to get a feeling for the material and thinking about a good process to make 80x7 of them without spending too much time.

So the idea ist to make a connector that will have some kind of material acting as a spring beneath it (the copper is very soft and won't have to much mechanical resistance). Over a endless-sphere, people use e.g. rubber, and more often silicone sheets for compressing the packs and leave some room for expansion. 

As seen in the picture, i applied some material (just got the end of a balloon - nothing else around ...). Just for demonstration.

Its all bumpy - just did that quick - but i try to get the idea ...

I'll need some 10mm tool to deepen/cut the material. Still, 0,5mm copper is not that easy to cut with a hand tool.

So i guess i'll have to find a way to eigther cnc mill or lasercut the material.

I also thought of applying e.g. 6 bumps like so: http://bit.ly/2reoBat

... to allow for more robust contact.

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#16
After some time off, got myself another charger (OPUS 3100 - Actually its exactly the same as the IPC-3 Voltcraft Chargers).

Opened one of the new ebike battery pack arrivals. Good catch for today :-) 60 Cells still at 2300mAh ! each :-)

I also found a good source around my place for waterjet cutting.

I'll just have to finish the construction for the bottom plate. Then, hopefully, i can let it cut and start the final assembly of the packs.

Missed the chance to get the Watchmon, Shunt and other stuff from Batrium. They are currently out of stock - waiting for a reply when the items will be available again.
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#17
Finally ordered WatchMon, LongMons and other stuff from Batrium (Thanks !). Try to get on with the construction of the packs in the meantime.
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#18
Welcome to the Batrium world Smile
crud likes this post
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#19
I finally get to the busbar section :-)

Just got some 25 meter 3x2,5 cable to try things out.

Extracting the copper was rather easy and i immediately tried out the drilling technique to achieve twisted busbars.



I got away from the copper sheet idea cause i realized that it would cost me a lot more to get this done.
So i am heading in another direction.
Korishan likes this post
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#20
So! Finally, Batrium Watchmon and other stuff arrived!



Had to pick it up from customs yesterday. Delivery was very fast, thanks Jaron!

So, currently i have almost everything ready. Beside the packs ...
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