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Author Topic: 18650 cell batteries  (Read 2349 times)
Paul_m
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« on: September 14, 2018, 01:46:46 PM »

Is anyone using or constructed any large battery packs made up of 18650 lithium cells recovered from laptop batteries?
This It's part of my plan for the next phase of the project.
I have found a supplier for the cells at a half decent rate so purchased 500 laptop batteries to begin processing them. A very time consuming job,  but just am activity to keep me busy whilst working away,  whist on someone else's lekky bill.
If you have this already,  what are your findings?
Thanks,  Paul
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Many thanks,

Paul
Scruff
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« Reply #1 on: September 14, 2018, 02:10:26 PM »

If I ever go lithium-ion base...and I'm still waiting for compelling data...

...I'd use Winston cells.

Life's too short to make batteries from 1000s of used cells.
« Last Edit: September 14, 2018, 02:12:10 PM by Scruff » Logged
Paul_m
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« Reply #2 on: September 14, 2018, 02:29:31 PM »

I have a lot of time on week days in the evening's when I'm not working.
I end up reading up or researching something as I get bored easily.
Turning over a couple of hundred a week once doing it efficiently shouldn't be too taxing, just repetive.
I'm too tight to pay for a system like growatt although I did contemplate it but want expansion capability.
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Many thanks,

Paul
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« Reply #3 on: September 14, 2018, 03:05:10 PM »

Just because you can doesn't mean you should.
FLA will cost less, be safe and work as well.
...I could be wrong...I could be right...


www.youtube.com[delete this text]/watch?v=Vq7JSic1DtM
« Last Edit: September 14, 2018, 03:07:41 PM by Scruff » Logged
dan_b
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« Reply #4 on: September 14, 2018, 04:51:37 PM »

There are hundreds of examples of people who have done exactly this on YouTube, including quite a few UK based projects. If you’ve got the time and the skills it can be a very low cost way to acquire a battery bank. 
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Scruff
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« Reply #5 on: September 14, 2018, 05:00:28 PM »

Depends on what your time is worth I'm sure.
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dan_b
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« Reply #6 on: September 14, 2018, 05:19:23 PM »

youtu.be/dGXIRGJdbHc
Uk chap


youtu.be/rS0HkdjZUHA
Australia


And this well known US chap has designed a PCB to speed up module assembly
youtu.be/LkLW9wBmlMs
« Last Edit: September 14, 2018, 05:24:17 PM by dan_b » Logged

3.06kWp SolarEdge system with a split array:
2.18kWp 10x South facing, plus 4x West facing 880W

Mk1 ImmerSUN DHW diverter
4kW PowerVault Battery

Tesla Model 3 Long Range
Scruff
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« Reply #7 on: September 14, 2018, 08:07:16 PM »

Bare in mind Youtubers get paid adcents and via Patreon. I advise subtracting that from the budget of prospective home builds.
I can assemble a battery to a bus bar in 3 hours or usually less.
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dan_b
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« Reply #8 on: September 14, 2018, 10:40:17 PM »

The Brit and the Aussie I linked had their systems built before Patreon came about.
The US guy used to make his living from a combination of EV conversions and battery installations but he is definitely also more of a career youtuber now.  Doesn’t mean his stuff is not useful, and he’s done several videos on how to speed up the time debt of building all those packs from individual cells.
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3.06kWp SolarEdge system with a split array:
2.18kWp 10x South facing, plus 4x West facing 880W

Mk1 ImmerSUN DHW diverter
4kW PowerVault Battery

Tesla Model 3 Long Range
Scruff
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« Reply #9 on: September 14, 2018, 11:28:23 PM »

Just because they started before patreon doesn't mean they don't use it. Did you watch them? HB Powerwall has been on patreon for donkeys.
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oliver90owner
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« Reply #10 on: September 15, 2018, 06:47:09 AM »

Tesla have done it for years.

The downside is the BMS required, I would think.
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Nickel2
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« Reply #11 on: September 15, 2018, 07:04:45 AM »

There are dozens if not hundreds of folk that have built batteries from used laptop cells. If you don't have a large pot of cash to throw at Winston cells or similar large single cells then the 18650 is the battery of choice.
This bloke will give you a bit of insight into what can be done:

<https://www.youtube.com/user/jehugarcia/videos>

Using individual small cells in parallel with a BMS, (cheap and freely available off the net), is a safe and cheap method of storage. If you have the time and are not awash with excessive piles of money, go for it. You will be very pleased with the results.

<https://www.youtube.com/channel/UCm5sG3-BXQZfVy3st2T_XKg/videos>

N2
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Of course it'll work. (It hasn't caught fire yet).
dan_b
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« Reply #12 on: September 15, 2018, 09:07:04 AM »

Yes I watched them. Lots of them. I posted a very similar thread to this here about 3 years ago when I saw them originally and got a similarly negative response about building a DIY battery back then. Strange considering this is a renewable energy site full of people who have built their own systems.

Whatever. 
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3.06kWp SolarEdge system with a split array:
2.18kWp 10x South facing, plus 4x West facing 880W

Mk1 ImmerSUN DHW diverter
4kW PowerVault Battery

Tesla Model 3 Long Range
Tiff
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« Reply #13 on: September 15, 2018, 09:32:40 AM »


Use cell level fuses and the lowest rating you can get away with. Glass axial fuses are a couple of GBP for hundreds from aliexpress. Don't faff around using resistor legs or plain wire.

Just think through the scenario of one of the cels becoming a 'heater'.  How many watts are you prepared to allow such a cell to draw before blowing a fuse? How hot could that cell become?

Have you found the second life storage forum?
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biff
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« Reply #14 on: September 15, 2018, 11:54:54 AM »

There will come a time when I will have to leave our Lead acid bank behind,
                                        I am constantly on the look out for a replacement bank but the only thing that takes my fancy, to date is the Redox flow Battery. The news is good in that department and sooner or later kits will be for sale that will allow us to built the flow banks of our choice voltage.
 I have examined and pondered these Lap top cells but the method of controlling them leaves me cold. They seem to have a mind of their own and that would bother me. There is some predictability in lead acid but there is a lot of gambling on the i8650 cells.
                                                   Biff
« Last Edit: September 15, 2018, 01:03:33 PM by biff » Logged

An unpaid Navitron volunteer,who has been living off-grid,powered by wind and solar,each year better than the last one.
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