The cells heat up , due to excessive-damaging discharge rates - right?
Lithium technology, at reasonable charge-discharge rates, does not produce the waste heat that is common with SLA, NiMH, NiCd etc.
Non-defective lithium cells can "heat up" but this is due to excessive charge-discharge rates, or overly high-low voltages!
Lithium ion cells, typically charge at 97-99% efficiency = 1-3% waste heat, with a similar discharge efficiency, possible, but only with moderate discharge "C" rates.
If your lithium cells get hot, even warm, you are exceeding efficient use - damaging.
I can't believe you're not just trolling, but for the sake of other poor souls who might read this and believe it, I will clear up another of the messes you post.
A battery heats up because it has resistance, and you're passing current through it.
The energy that goes into waste heat is directly proportional with it's resistance.
For example, if you have a cell with a 50mOhm Ri (Internal Resistance), and you discharge it at 10amps, your voltage drop will be 0.5v, and the energy going into heating the cell will therefore be 1watt (0.5v*10a). You can also use I^2*Ri. (this 5watts is energy that was stored in the cell as potential energy, but is wasted in resistive heating of the cell, because every cell has internal resistance, and any amount of current, large or small, through any resistance, large or small, will have voltage drop, and heating equal to the voltage drop times the current)
If you have a nano-tech cell with a 0.8mOhm Ri, and you discharge at 10amps, your voltage drop is 0.008v, and your heating is 0.08watts.
If you discharge your nano-tech cell at 100amps, you have 0.08v of drop, and your heating is 8watts.
If you're using the best 18650 laptop cell on the market, the 3.1Ah NCR18650R, you've got 92mOhm of Ri. So, you discharge at 10amps, and you get 0.92v of sag, and 9.2watts of heating (which is going to make at pretty blazing hot in a minute or two). Discharge at 5amps, you get 0.46v of sag, and 2.3watts of heating.
If you take normal cheapo HK 5AH LiPo with an Ri of 5mOhm, and discharge it at 10amps, you get 0.05v of sag, and 0.5watts of heating. Discharge it at 20amps, you get 0.1v of sag and 2watts of heating. Discharge it at 30amps and you get 0.15v of sag and 4.5watts of heating. Discharge it at 40amps and you get 0.2v of sag and 8watts of heating. Lets look at that 8watts of heating number.
It's ~134g for that 5Ah LiPo cell. You're heating it at 8watts at 40amp discharge.
The best 18650 cell, NCR18650 is 45g, and 5amps (1.6C discharge), it's making 2.3watts of heating.
The specific heat capacity (the amount of energy per gram it takes to change a degree in temp) is roughly identical for both cells.
The difference in mass is 3x, the difference in heating is ~3.2x, over the course of a discharge, these cells would track each others temperature almost exactly, the LiPo cell at 8 times higher discharge current would finish ever so slightly warmer in this example.
Getting cells warm is a good thing. You don't want to store them warm for extended periods, because it decreases calendar life from accelerating the rate the solvents decompose, however, if you're using the cell, warm is better for the cell and MUCH better for the performance. This is why the Volt and Tesla have heating systems in there batteries, and why they won't even allow it to charge while its too cold etc.
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