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Project 18650
#1
So I have been collecting, stripping, cleaning, charging, storing and testing 18650's till all I see when I close my eyes is 18650's

My plan is to build 2 x 7S80P ( >1800mah per cell ) banks and hook them up to my Axpert 3KVA inveter and replace my 6 x 100ah lead acid's.

Here are a few pic's of how things are going

Striping
 

Cleaning


Charging
This is how I started charging which I soon realized was not going to work as it was going to take too long


I then tried to increase capacity by doing a 12P parallel charge board and my RC charger but this never pushed 12A even though it's 25A charger again taking too long


Finally I used Seidel Philipp's 18650 PCB design and had them produced at JCBPCB for $2 then added the TP4056 for my charging station


Then into Storage for 3-4 weeks


Upgraded my charge station to a Test/Charge station. ( sadly with COVID-19 lock down my last 2 Lii-500's had not arrived in time )


And here are my tested cells L-R ( >2400, >2200, >2000, >1800 )


So I am probably 40% of the way through my testing of the cells, I have around 60 cells < 1800mah, and around 200 cells which I have to discard due to rust, SD, dead or tripped CID.

The wall mounting is at the laser cutters which is based off HBPowerwall's design
Next is to make the bus bar jig and start making the bus bars.
BMS is on it's way and this is from the DiyBMSv4 project and has been produced by JCBPCB
I still want to build a new outside shed purely to be more safe

I'll post more photo's as and when I get trough the outstanding stuff, getting old laptop batteries in South Africa is a challenge we don't have good laws around recycling and so people tend to do what the packages says not to and discard them in the dump, we also don't have a huge ev bike presents, So I take what I can get and make do, it's been slow but steady.
hbpowerwall likes this post
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#2
Nice job!!

I am trying out some cells as well and I would like to hear from you what is the method and procedure you are using for testing them. After stripping and cleaning, you just put it to charge and after test it on Lii-500?? Or do you simply put them right after cleaning on Lii-500 to see the capacity?? Which configurations are you using, Fast test with 500mA our Normal test and so on??

I will wait to hear more from you!! Nice job by the way!
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#3
>all I see when I close my eyes is 18650's
And most of mine are grey - dreary.  Maybe they should make them with colorful stripes Smile

Looks great!
Ibiza and Crimp Daddy like this post
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#4
(04-09-2020, 12:26 AM)thamer.khatib Wrote: Nice job!!

I am trying out some cells as well and I would like to hear from you what is the method and procedure you are using for testing them. After stripping and cleaning, you just put it to charge and after test it on Lii-500?? Or do you simply put them right after cleaning on Lii-500 to see the capacity?? Which configurations are you using, Fast test with 500mA our Normal test and so on??

I will wait to hear more from you!! Nice job by the way!

After cleaning them I test with a voltmeter for any dead cells, anything that has a volt reading I charge them to 4.2v using those TP4056 (1A) modules, I also monitor their temperatures during charge and remove any that are hot to touch, I then let them stand for 3-4 weeks. At this point I put them in the LII-500 to normal test @ 1000mah ( which is only 500mah ) if the volt reading when inserting the cell is <4.1v I discards those as they are self discharging, once the test is complete I write the capacity on the cell and store it. Once I have 1200 cells of over 1800mah I'll build my packs
Rekim, Cezar, chuckp like this post
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#5
Just a small update, till now I have still been testing cells, I have another load of laptop batteries on their way, about 1500 cells, unfortunately due to South Africa being in lock down for the past 3 weeks and 2 weeks to go, only essential services are allowed to deliver and old laptop batteries are not considered essential so I guess I have to wait.

In the meantime I have made my busbar jig and started creating the bars.
The busbars are 3 x 2.5mm solid copper twisted together using a drill, what surprised me was how much copper wire you actually need to make 28 busbars below is only 14 and I used 10m of 4 core 2.5mm surfix cable.

oloyeadeniran and Solloh like this post
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#6
Hello rolfbartels,

please i want to know how you built your power station for charging of your TP4056, if it can produce more amperage if other sub stations are added, et cetera
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#7
Hi Oloyeadeniran,

For my testing station I am using a HP 750w 63A 12V Server Power you can see it in the picture below top right has an orange label.
From this I power all the Lii-500 which I use for my discharge testing (3 at the moment, 2 more to come). I can also use the Lii-500's to charge for storage SD testing once I have stripped the battires so this gives me 40 charges, but if you get into a cycle where you are charing and discharging then I can only do 20 of each which is enough for me.

I also power a $6 DC Step Down Module which is capable of delivering 20A @ 5v and is enough to power 20 TP4056 module, I got this from banggood,
I found that the heatsink's got really hot and you could not touch them so I added a fan and now they are cool to the touch. 
If you wanted to power more that 20 TP4056's you just add more of these modules, they are way cheaper than buying a dedicated 12v/5v PSU. 

I know of some people who have bought a good quality PC PSU, and these work well too, you just need to make sure that individual rails can carry the load you are
expecting, I had the server PSU so I just need the $6 module.

For the TP4056 charge boards I just followed Seidel Philipp's design, I had the PCB's printed at JCBPCB which cost only $15 shipped for 10, in my picture I am only using 5, you don't need to use these PCBs I prefer them as it has built in protection per TP4056 for reverse polarity. The newer TP4056 with build in protection are at least $1 more per module so using the PCBs works out cheaper. 

I have build every thing on a single piece of plywood, this way when I am done I can just pick up the whole station and store it, if I need to use it again I simply place it down plug it in and I'm ready, Makes it far easier and neater.

I hope this information helps.



DC Stepdown Converter
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#8
Proper job!

(04-30-2020, 06:45 AM)rolfbartels Wrote: For my testing station I am using a HP 750w 63A 12V Server Power you can see it in the picture below top right has an orange label.

I also power a $6 DC Step Down Module which is capable of delivering 20A @ 5v

Just wondering - Does the HP PSU not have a 5v output you could tap straight into?

What are you going to use to connect to each cell - fuse wire, spotweld nickel strip, or some other method?

Could you outline what purpose this project will serve - as a UPS backup, or to power your house day to day with panels etc? Have you calculated your daily requirements?

Will the "2 x 7S80P" be in series or parallel ie. 14S80P or 7S160P. I'm guessing the later to get you 48v?
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#9
Hey Wayne,
2 banks of 7S80P, my inverter is 24V, Currently I have 6x100ah lead batteries that are dead, I used to get 4-6 hours now I'm only getting 30-45mins, my load is between 400w-750w.

The HP PSU does not have a 5v output that can deliver 20A, which is why I have that little setup down module.

I live in South Africa and we have a real problem with our government power grid, the current government has neglected to maintain our power stations and they are also way past thier life span, for the last 5 years we have had what we call load shedding, this is when the grid gets critically strained and the power company based on a scheduled turns off power on a rotational bases around the country for 2-4hrs a day and 2-3 times a day.

This project is to replace the lead batteries and with the ability to just keep expanding, my eventual goal would be to be off grid, I currently have 4.8kw of grid tied solar, but as you can imagine they are pointless when we are getting load shedding.
Ibiza likes this post
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#10
So I finished testing all my sells came come up 60 short to make 14s80p



So what am I gonna do ?..... get more batteries


Strip them


clean and charge them



My Powerwall has slightly stagnated, I and waiting on a tons of orders from Aliexpress but South Africa is still in lock down and out postal service is not processing any parcels
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