Packaging for second life lithium 18650 battery cells

[OffgridSystems]

I'm working on packaging and BMS solutions for cylindrical cells, of all lithium types. Current product on eBay has 18650 (working on 2170) cell packaging with and without JK active balancing BMS. All packages are bring-your-own cells. System uses high current gold plated Beryllium Copper springs instead of welding, so no-weld and no soldering. Also uses flat cable for cell sense wires instead of fragile single conductors. Specs and build information is available for both 12 and 24V nominal system, or you can roll your own and make any voltage you can imagine.

Thanks for viewing, appreciate any feedback!
Tim

12V with BMS:

DKblock2 rebuildable DIY 12V battery kit, 1865 lithium, weldless w/JK Active BMS | eBay

No welding tabs on cells. (18650 cells not included.). The JK-BMS included is the JK-BD4A-8S-4P, which is a 4S/8S, 40 amp, smart active BMS, which we derate for safety to 30A and 4S for this build. After you obtain the cells, they are loaded in the DK cell holders and clamped together with screws.

www.ebay.com

12V without BMS:

DKblock rebuild-able DIY 12V I8650 battery kit, weldless BYO cells/BMS -DKblock2 | eBay

No welding tabs on cells. Note that the lithium iron phosphate (LFP) or lithium ion cells are NOT provided in this kit. BMS is not included in this kit. (1) B- buss blue cable: Connects the battery B- to load or BMS.

www.ebay.com

12V/24V without BMS

DKblock2 rebuild-able DIY 12V 24V I8650 battery kit, weldless BYO cells/BMS | eBay

No welding tabs on cells. If you want a 24V nominal DKblock2 kit without BMS, you need two of these 12V kits, and then combine for 24V. Note that the lithium iron phosphate (LFP) or lithium ion cells are NOT provided in this kit.

www.ebay.com

Build your own boards using DK springs?

DKblock BMS 18650/2170 no-weld system - spring contacts gold plated 20 pcs - DIY | eBay

If you need higher currents than 8A continuous or 15A for 10 sec, then you might want to consider welding. It can be hand soldered or machine reflow soldered to your PCB, and the design of the wide base of the part allows it to not move around pre-soldering, making the boards easier to handle.

www.ebay.com

 

[JMACK61]

I'm working on packaging and BMS solutions for cylindrical cells, of all lithium types. Current product on eBay has 18650 (working on 2170) cell packaging with and without JK active balancing BMS. All packages are bring-your-own cells. System uses high current gold plated Beryllium Copper springs instead of welding, so no-weld and no soldering. Also uses flat cable for cell sense wires instead of fragile single conductors. Specs and build information is available for both 12 and 24V nominal system, or you can roll your own and make any voltage you can imagine.

Thanks for viewing, appreciate any feedback!
Tim

12V with BMS:

DKblock2 rebuildable DIY 12V battery kit, 1865 lithium, weldless w/JK Active BMS | eBay

No welding tabs on cells. (18650 cells not included.). The JK-BMS included is the JK-BD4A-8S-4P, which is a 4S/8S, 40 amp, smart active BMS, which we derate for safety to 30A and 4S for this build. After you obtain the cells, they are loaded in the DK cell holders and clamped together with screws.

www.ebay.com

12V without BMS:

DKblock rebuild-able DIY 12V I8650 battery kit, weldless BYO cells/BMS -DKblock2 | eBay

No welding tabs on cells. Note that the lithium iron phosphate (LFP) or lithium ion cells are NOT provided in this kit. BMS is not included in this kit. (1) B- buss blue cable: Connects the battery B- to load or BMS.

www.ebay.com

View attachment 190002
12V/24V without BMS

DKblock2 rebuild-able DIY 12V 24V I8650 battery kit, weldless BYO cells/BMS | eBay

No welding tabs on cells. If you want a 24V nominal DKblock2 kit without BMS, you need two of these 12V kits, and then combine for 24V. Note that the lithium iron phosphate (LFP) or lithium ion cells are NOT provided in this kit.

www.ebay.com

Build your own boards using DK springs?

DKblock BMS 18650/2170 no-weld system - spring contacts gold plated 20 pcs - DIY | eBay

If you need higher currents than 8A continuous or 15A for 10 sec, then you might want to consider welding. It can be hand soldered or machine reflow soldered to your PCB, and the design of the wide base of the part allows it to not move around pre-soldering, making the boards easier to handle.

www.ebay.com

Nice! Cell(s) will go bad one day, you make the rebuild or repair much easier.

 

[OffgridSystems]

Thanks JMack! I'm working on 2170 cell type next, but I'd like to package larger cells too. If you know of any larger cells, I'd love to hear how you would package them, in what parallel grouping would you do? I'd look at the 4680 type but I don't think there will be a lot of salvage cells coming out of that structural pack.
A lot of lithium iron phosphate (LFP) cells come in the 32650 or 32700 cylindrical sizes...maybe that would be a good one to do?

32700 lithium cell for sale | eBay

Get the best deals for 32700 lithium cell at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

Thanks again!
Tim

 

[JMACK61]

Thanks JMack! I'm working on 2170 cell type next, but I'd like to package larger cells too. If you know of any larger cells, I'd love to hear how you would package them, in what parallel grouping would you do? I'd look at the 4680 type but I don't think there will be a lot of salvage cells coming out of that structural pack.
A lot of lithium iron phosphate (LFP) cells come in the 32650 or 32700 cylindrical sizes...maybe that would be a good one to do?

32700 lithium cell for sale | eBay

Get the best deals for 32700 lithium cell at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

Thanks again!
Tim

I had no ideal of all the form factors for cylindrical cells 18650, 26650 and a few 2170’s is all I ever worked with. Thanks for the eBay link. Last week I stepped into the prismatic cell world purchasing 7.5 kWh in 3 Sonnen brand server rack batteries. I started with Lead Acid to 18650 to 26500 so it was time to go prismatic. I won’t stop with the cylindrical cells there are too many free ones to pass up. I cleaned out a failed computer business two weeks ago and got over 500 free cells none less than 2900 mAh. When you savage cells like I do. No matter how much capacity and ir testing you do It is a gamble. I have spot welded 16s20p (26650’s) all that my arms can carry on a good day, only to see fail a short time later so I find the bad cell(s) and go through hacking nickel strip and break the cell holders hoping to press the bad cell(s) out. But the cell sleeve is mangled and makes it a bear to slide out. looks Like the one cell I can see is sleeveless, is that true? Also 48v nominal inverters are king.