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Heating and overheating of accumulators

For the heaterthere are two main causes

  • Excessive switch load → without serious impact
  • The mounting of a resistor in the atomizer not adapted to the accumulator.

For that we must understand a minimum of things about accumulators, to simplify we will talk about two types of batteries:

  • Protected accumulators: If you make a resistance of value lower than that recommended by the manufacturer, the accumulator is cut for safety and you will have no tension to supply your resistance. 

 

  • For the unprotected : If you make a resistance of value lower than that recommended by the manufacturer, your accumulator will heat up abnormally.
    The risk: it is an overpressure and a heating of the element which generally (or partially) protected against the rises of temperatures and the overpressures by internal circuits, can however be irreversibly damaged by a strong inflammation. This makes the element unstable and prematurely deteriorates your accumulator when it is not permanently dead.

If you detect a rise in temperature, it is abnormal.

Remove the battery from the mod.

For overheating, the atomizer switch, in general, becomes very hot. It is likely that this is a short circuit (the accidental connection of two points of the circuit, between which there is a difference in potential, by a driver of low resistance).

             A short-circuitit is the accidental connection of two points of the circuit, between which there is a difference of potential, by a conductor of weak resistance. It gives birth to a short circuit current.

             In our case, to simplify, I schematized the set up below.

 Heating and overheating Scheme 1

There is a short circuit when the positive part in red, powered by the “+” of the accumulator, is in direct contact with another metal part of the mod or the atomizer, which itself is powered by the “-”. »From the battery when the Switch is activated.

At this point, the accumulator heats up and the intensity of the heat dissipates in the switch because it is the part that has the largest area of ​​direct contact with the accumulator.
But it is impossible that the problem comes from the Switch (no positive and negative simultaneous contact in this element).

Most common short circuit problems :

  •  The 510 connection of the mod:

It is made up of three distinct parts:

Heating and overheating Scheme 2

  • The thread of the 510 connection (in gray) connected to the mod by the top cap
  • The insulation (in yellow), inserted in this connection to isolate it from the third part
  • The positive screw (in red) of the 510 connection of the atomizer

Heating and overheating Scheme 3

Short circuits occur mainly on atomizers whose screw positive pole does not come out enough.

Heating and overheating Scheme 4

When the screw is depressed, there is a possibility that contact with the "+" of the accumulator, which is too wide, affects at the same time the positive screw and the threaded edge of the 510 of the atomizer.

This is a first possibility

SAMSUNG

  • The tray :

When you screw and unscrew the screw attached to the tray, you may rotate the media on which the positive side of the resistor is located, and this offset may affect the opposite pole on the same tray (first picture).

SAMSUNG

To avoid this risk, you can insert a thermally insulating end, which will prevent the contact of the two poles at this level (second picture).

  • Resistance :

When you make your resistances, pay attention to two things.
- The first is to check that it is not too low (for the risk of sagging) and that it does not touch the base to which it is connected by the legs. 

SAMSUNG

  • The second, be sure to cut the screw properly, the surplus of the legs of the resistance set, to avoid the risk of a short circuit by posing your chimney that touch the edges of the bell.

SAMSUNG

  • The nano kit for Kayfun:

Less obvious: The lower part of the chimney (bell) of Kayfun Lite is shorter than Kayfun V3. If your fixing screws for the coil are too high, placing the top of the chimney, you may touch both poles at the same time. Where, short circuit!  

Heating and overheating Scheme 9

  •  Followers of the Subohm:

For those who use resistors of very low value, their wear is faster than the others. Prematurely worn by the intensity that passes through them, they may break. They are to be repeated more often than when they have a current value.
Hidden by the wick soaked in juice this break is not obvious to detect.
In addition, the material and the diameter of the wire used for the coil also plays a role, because the stainless steel is more fragile than the Kanthal, since the stainless steel supports lower temperatures.
If in doubt, make a new resistance.

Finally, when your mod is hot, immediately remove your battery and put it in the fridge to quickly stabilize the internal elements. However, there is a good chance that it has already deteriorated and that it no longer has the same capacities as originally if it is not out of service. Because the temperature contributes to make the element unstable.

One last tip: NEVER CHARGE AN ACCUMULATOR WHEN IT'S HOT

Add-on video:

And finally, I enclose some data about the most common accumulators with the limit value of the resistance that can be done:

 

 

Name

Size

 

Continuous Discharge Amps

 

 

Maximum Discharge

 

 

Amps

 

C Rating

 

Ohm to run

AW IMR
Aw 14500 600 mah / 4.8 amp / 6 amp / 8c / 0.9 ohm
Aw 16340 550 mah / 4.4 amps / 5.5 amp / 8c / 1 ohm
AW 18350 700 mah / 6.4 amp / 7 amp / 8c / 0.7 ohm
Aw 18490 1100 mah / 8.8 amp / 11 amp / 8c / 0.5 ohm
Aw 18650 1600 mah / 16 amp / 20 amp / 10c / 0.3 ohm
Aw 18650 2000 mah / 16 amp / 20 amp / 8c / 0.3 ohm

Efest IMR
Efest 10440 350 mah / 1.4 amp / 3 amp / 8c / 3 ohm
Efest 14500 700mah / 5.6 amp / 7 amp / 8c / 0.8 ohm
Efest 16340 700mah / 5.6 amp / 7 amp / 8c / 0.8 ohm
Efest 18350 800mah / 6.4 amp / 8 amp / 8c / 0.7 ohm
Efest 18490 1100mah / 8.8 amp / 11 amp / 8c / 0.5 ohm
Efest 18650 1600mah / 20 amp / 30 amp / 18.75c / 0.3 ohm
Efest 18650 2000mah / 15 amp / 20 amp / 8c / 0.4 ohm
Efest 18650 2250mah / 18 amp / 20 amp / 8c / 0.5 ohm
Efest 26500 3000mah / 20 amp / 30 amp / 6.5c / 0.5 ohm
Efest 26650 3000mah / 20 amp / 30 amp / 6.5c / 0.5 ohm


Efest IMR Purple
Efest 18350 700 mah / 10.5 amp / 35 amp / / 0.7 ohm
Efest 18500 1000 mah / 15 amp / 35 amp / / 0.5 ohm
Efest 18650 2500mah / xx amp / 35 amp / / 0.15 ohm
Efest 18650 2100mah / xx amp / 30 amp / / 0.2 ohm

EH IMR
EH 14500 600 mah / 4.8 amp / 6 amp / 8c / 0.9 ohm
EH 15270 400 mah / 3.2 amp / 4 amp / 8c / 1.4 ohm
EH 18350 800 mah / 6.4 amp / 8 amp / 8c / 0.7 ohm
EH 18500 1100 mah / 8.8 amp / 11 amp / 8c / 0.5 ohm
EH 18650 2000 mah / 16 amp / 20 amp / 8c / 0.4 ohm
EH 18650 NP 1600 mah / 20 amp / 30 amp / 18.75 c / 0.3 ohm

 

MNKE IMR
MNKE 18650/20 amp / 30 amp / 18.75c / 0.4 ohm
MNKE 26650/20 amp / 30 amp / 18.75c / 0.4 ohm

Samsung ICR INR
Samsung ICR18650-22P 2200 mah / 5 amp / 10 amp / 4.5c / 0.9 ohm
Samsung ICR18650- 30A 3000 mah / 2.4 amp / 5.9 amp / 1c / 1.5 ohm
Samsung INR18650-20R 2000 mah / 7.5 amp / 15 amp / 7c / 0.6 ohm

Sony
Sony US18650v3 2150 mah / 5 amp / 10 amp / 4.5c / 0.9 ohm
Sony US18650VTC3 1600 mah / 15 amp / 30 amp / 9.5c / 0.4 ohm
Sony US18650vtc4 2100 mah / 10 amp / 25 amp / 12 c / 0.5 ohm
Sony US26650VT 2600 mah / 25 amp / 45 amp / 17c / 0.1 ohm

Trustfire IMR
Trustfire 14500 700 mah / 2 amp / 4 amp / 2c / 2.2 ohm
Trustfire 16340 700 mah / 2 amp / 4 amp / 2c / 2.2 ohm
Trustfire 18350 800 mah / 4 amp / 6.4 amp / 5c / 1.1 ohm
Trustfire 18500 1300 maah / 6.5 amp / 8.5 amp / 5c / 0.7 ohm
Trustfire 18650 1500 mah / 7.5 amp / 10 amp / 5c / 0.6 ohm


Panasonic
NCR18650B 18650/3 amp / 4 amp / 1.1c / 1.5 ohm
NCR18650PF 18650/5 amp / 10 amp / 3.4c / 0.9 ohm
NCR18650PD 18650/5 amp / 10 amp / 3.4 c / 0.9 ohm
NCR18650 18650 / 2.7 amps / 5.5 amps / .5 c / 1.6 ohm

Any other protected 18650 3 amp 4 amp 1.5ohm
Any unprotected 18650 5 amp 10 amp 0.9 ohm

Orbtronic
sx22 18650 22 amp 29 amp 11 c 0.2 ohm

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