Building 100 AH LiFePo4 Battery Box

An example of an EVE 100 Ah cell specs from this website: https://www.evlithium.com/LiFePO4-Battery/eve-lf100la-100ah-battery.html

Specification
Battery Brand: EVE
Battery Model: LF100LA
Min. Capacity: 100Ah
Min. Energy: 320Wh
Initial internal resistance: ≤0.5mΩ
Nominal Voltage: 3.2V
Charging Cut-off Voltage: 3.65V
Discharging Cut-off Voltage:2.5V (T>0℃), 2.0V (T≤0℃)
Standard Charging Current: 50A(0.5C)
Max. Continuous charging/discharging Current: 100A 1.0C
Max. Pulse charging/discharging Current: 200A 2C(30S)
Cycle Life: 4000 Cycles @80% DOD
Charging Temperature: 0℃~55℃
Discharging Temperature: -20℃~55℃
Dimension: 118.5±0.50mm(H)*160±0.50mm(w)*50.1±0.5mm(T)
Weight: 1.98±0.05 kg
Encapsulation mode: U-shaped capsule

This may not be the same model of cell you're looking, as there are 3 different 100 Ah cells listed, but this gives a good example of what the peak current specs are, and how they derate the lifecycle claims for higher current use.

Amazon actually sells parallel compatible versions of the JK BMS, if you are wanting to do combo series/parallel battery packs

https://www.amazon.com/gp/aw/d/B0FPCZS56M

Eric Hanson wrote:Ok, I will try to explain what is going on in this (mess) picture!

..................................

I still have a few things to tidy up.  I need to shorten some cables and tie other cables together to make things look better, but I think it is coming along.

Thoughts?

Eric

Eric,    I may have missed it in your build description, but do you have plastic/ABS separation sheets between each adjacent cell?  I just received 4 EVE 100 Ah cells that will fit nicely in an ammo-box build but need to confirm the need or not for dividers as has been mentioned elsewhere on internet descriptions.  Thanks!

Allen Jackson wrote:Amazon actually sells parallel compatible versions of the JK BMS, if you are wanting to do combo series/parallel battery packs

https://www.amazon.com/gp/aw/d/B0FPCZS56M

Pasted below is the BMS I purchased for this first 12V/100Ah build.....

John Weiland wrote:Eric,    I may have missed it in your build description, but do you have plastic/ABS separation sheets between each adjacent cell?  I just received 4 EVE 100 Ah cells that will fit nicely in an ammo-box build but need to confirm the need or not for dividers as has been mentioned elsewhere on internet descriptions.  Thanks!

Non-conductive separators are a very good idea if your system is going to be moved around, because that would prevent wear on the outer cases, but I don't think this type of battery is using the outer shell as an electrode. I'll check mine to test if either electrode has continuity with the shell.

Did your batteries come with fiberglass separators? All of the cells I have ever bought, did come with those, but that might be a vendor-supplied bonus.  Admittedly, all my (limited) experience working with LiFePO4 batteries, has been with the larger batteries in bulk, for stationary powerwalls, or ESS (energy storage systems), so I don't know how the smaller ones are sold. On the smaller end of the scale, everything needed to be portable and carry it's own weight (robotics), so while the original ones were lead-acid based, that quickly got swapped to NiMH because NiCad was toxic AND had a vicious memory problem, then lithium polymer as the holy grail.

BTW John, if you are wanting to add battery banks to that one, this is the better model for that - https://www.amazon.com/JKBMS-12V-24V-Bluetooth-Protection-JK-B1A8S10P-HC/dp/B0FPCZS56M?th=1

On a different note, many of the Daly BMS models have parallel functionality too - read the details.