Nab??jen?? a ??ivotnost Li-ion 18650.

[RV]

Hmmm a co je podle vas dulezitejsi? U kazdeho svaba mate napsano 
Absolute maximum parameters - on to vydrzi, ale zrejme mu to zivotnost 
neprida...

Napeti 4.2V pro lion technologii je jiz "stresujici" a vzhledem k tomu, 
ze clanek na tomhle napeti setrvava pomerne dlouho v rezimu CV - bezne 
30% casu a valna vetsina nabijecek je na tomhle napeti drzi trvale po 
napeti tak je to z meho pohledu nevhodne koncove napeti.

Li-ion cannot absorb overcharge, and when fully charged the charge 
current must be cut off. A continuous trickle charge would cause plating 
of metallic lithium, and this could compromise safety. To minimize 
stress, keep the lithium-ion battery at the 4.20V/cell peak voltage as 
short a time as possible.

Once the charge is terminated, the battery voltage begins to drop, and 
this eases the voltage stress. Over time, the open-circuit voltage will 
settle to between 3.60 and 3.90V/cell. Note that a Li-ion battery that 
received a fully saturated charge will keep the higher voltage longer 
than one that was fast-charged and terminated at the voltage threshold 
without a saturation charge.

If a lithium-ion battery must be left in the charger for operational 
readiness, some chargers apply a brief topping charge to compensate for 
the small self-discharge the battery and its protective circuit consume. 
The charger may kick in when the open-circuit voltage drops to 
4.05V/cell and turn off again at a high 4.20V/cell. Chargers made for 
operational readiness, or standby mode, often let the battery voltage 
drop to 4.00V/cell and recharge to only 4.05V/cell instead of the full 
4.20V/cell. This reduces voltage-related stress and prolongs battery life.

Some portable devices sit in a charge cradle in the/on/position. The 
current drawn through the device is called the/parasitic load/and can 
distort the charge cycle. Battery manufacturers advise against parasitic 
load while charging because it induces mini-cycles, but this cannot 
always be avoided; a laptop connected to the AC main is such a case. The 
battery is being charged to 4.20V/cell and then discharged by the 
device. The stress level on the battery is high because the cycles occur 
at the 4.20V/cell threshold.



Radek Vicek

Dne 8.1.2015 v 14:08 gatilo napsal(a):
>   8.1.2015, 14:05:22
>
> Ja mluvim o ds k clanku a vy o nabijecce.
> Ted si dovolim zakernou otazku: Nemuze byt v tech 4,1V u  nabijecky uz
> zapocteno "zivotnost prodluzujici snizeni napeti" ?
>
> S pozdravem Pavel
>    mailto:gatilo + zavinac + centrum.cz
>
> --
> RV napsal:
>
>> Hmmm tak to jsme zrejme zili na jine planete - na vsech nabijeckach mam
>> deleni na lion a lipol s tim, ze nominal u lionu je 3.6V a koncove
>> nabijeci 4.1V - lipol je posunuty o 0.1V vys.
>
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