Difference between these cells? 38120, 38140, 40152S

[markz]

Difference between these cells?
38120
38140
40152S

 

[mark5]

Size and Ah. See http://www.headway-headquarters.com/lithium-lifepo4-cells/.

 

[markz]

OK thanks, so they are all the same C-rating, 3C-10C, except HP series, 10-25C.

 

[markz]

Whats the reasoning behind doing a metal battery housing/casing(like your regular AA Primary battery "Non-Rechargable")
And using the "Pouches" with tabs.
I see the Headway batteries have screw ends, then its an easy DIY project, with the metal tabs, orange house. I have yet to see a bolt to screw into the ends.
Then for the other style of metal house, you need to spot weld them using metal ?sheets?, or use a 100W soldering iron with heavy big tip.
What about the pouches how are you suppose to connect the pouches?

So the reason why LiFePO4 battery packages have different discharge rates C-rate cont and max/Acont. and Amax is because each cell type, whether it be 38120S, 38120HP, 38140S or 40152 cells (Cells Headway Headquarters sells), have different discharge capabilities. The numbers denote physical size. Headyway has higher prices even for their DIY kits. But they are American.
38120S states 3C/10C
38120HP, 10C/25C
38140S 3C/10C
40152S 3C/10C

Then I see on BMS Battery for their LiFePO4 batteries discharge rates from 15A/30A, 30A/60A and 50A/100A. I dig deeper into their cell only page.
38120S (10C=120Acontmax 15C=180Amax) 10Ah
38140S similar different Ah, 12 Ah
5Ah 6665143 Li-NiCoMn Polymer Battery Cell - 1C=5Acont, 2C-10Amax (POUCH)
LiFePO4 Battery 7070260 Polymer Cell - 9-10Ah, 1Ccont 2Cmax (POUCH)
40152S - 15Ah 10C=150Acont 15C=225Amax
High C-Rate 10Ah Li-NiCoMn Li-Ion Cells - 5C=50Acont 10C=100Amax (POUCH)
missing High C-Rate 15Ah Li-NiCoMn Li-Ion Cells 5C=75Acont, 10C=150Amax (POUCH)
missing High C-Rate 10Ah Li-NiCoMn Li-Ion Cells 5C=50Acont, 10C=100Amax (POUCH)
Panasonic High Capacity 18650 Battery Cell NCR18650PF - 2.9Ah - 10Acont.
Lithium Ion Battery 18650 Battery Cell 2200mAh - 18650 Battery Cell - Model: N18650 - Max.Constant Dicharge Current: 4.4A - Chemical: Ni-Co-Mn
2500mAh Lithium Ion Battery 18650 Battery Cell - Lithium Ion Battery 18650 Battery Cell - Model: 18650F5 - Max.Constant Dicharge Current: 5A - Chemical: Ni-Co-Mn
LiFePO4 Battery Cell - Model: 8760153 - 5.2Ah - Max.Constant Dicharge Current: 10A - Chemical: LiFePO4 (POUCH)
SANYO NCR18650GA 3450mAH Lithiun-Ion Battery Cell - 3.6V - Continuous Discharging Current (Max.): 10A

So if LiFePO4 is Lithium-Ion, I assume thats the "Li", which is the chemistry of the battery itself. Then I wonder about NiCoMn, what is that exactly?
Im just guessing, Nickel Cromium Managanese? I was close.....its actually Nickel Cobalt Manganese

This thread pops up, Title - LI-ion NiCoMn Battery from BMSBattery
http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=33566 which I will read no doubt.

1

It is only rated at 1C continuous, ...

That's strange. Most Nickel Cobalt Manganese cells have a 5c continuous and 10c burst rating.
1C continuous is usually for 18650 LiCo cells.

Any NMC cell in 18650 was made for a laptop, not an EV. It's going to have very little material in it to improve conductivity.

 

[Voltron]

Re connecting pouches, usually they're all lined up, squished in a box to reduce puffing, and the tabs clamped together with spacer blocks between them.

 

[spinningmagnets]

The 38 in 38120 means the cell is 38mm in diameter, the 120 is they are 120mm long.

That NMC thread was from 2011, and at that time, NMC did not produce as much current as they do now. all of these chemistries we are talking about are Lithium-Ion based. The actual recipe that makes up the cathode/anode/electrolyte varies, so several names have been used by manufacturers to identify.

[Googles "battery university"]

LiFePO4 is Lithium Iron Phosphate. Its nominal (average) voltage over a complete cycle is 3.2V per cell. Headways are the most famous of LiFePO4 cells.

The rest of these below have a nominal 3.7V per cell:

Lithium Nickel Manganese Cobalt oxide, LiMnCoO2, NMC

Lithium Nickel Cobalt Aluminum oxide, NCA

Lithium Manganese oxide, LiMn2O4, LiMn

If you order LiPo from hobby king, the "Po" is for polymer, which means the electrolyte is a gel. It is actually LiCoO2, Lithium Cobalt Oxide, and some guys call it LiCo

And also, there are very minor variations in the NCA from one manufacturer over another (Samsung compared to Panasonic). From "battery bro":

"...Panasonic NCR18650BF...The difference between the new BF and the older B model is that this battery includes the chemical "SiO" or silicon monoxide..."

What is the difference between the blue and green Samsung 25R 18650?

Samsung SDI guarantees that the performance of the 25R2 with blue PVC and 25R5 with green PVC are totally same.

The percentage of Electrolyte that has changed in the 25R5

FEC: 3 -> 5%
SN: 1.5 -> 1%
PA77: 1-> 1.5%

The life cycle would be better than 25R5
Bottom-line: The green 25R5 has a better cycle life.