Thank you for the answer and links! Really great reading extending knowledge.
Pon., 2 gru 2019, 19:51 użytkownik Dennis Lee Bieber < [email protected]> napisał: > On Sun, 1 Dec 2019 09:49:40 -0800 (PST), in > gmane.comp.hardware.beagleboard.user Wojciech B > <[email protected]> wrote: > >Thank you for the answer. I also found that my LI-Ion have additional > >internal protection and they simply do not allow overcharging so I hope I > >am on the safe site. > >What is the reason for 5 hours limit? Assuming I have 3000mAH battery > and > >500mA charger it would always take longer to charge battery. > >Regards, > >W > > > https://batteryuniversity.com/learn/article/charging_lithium_ion_batteries > """ > The advised charge rate of an Energy Cell is between 0.5C and 1C; the > complete charge time is about 2–3 hours. Manufacturers of these cells > recommend charging at 0.8C ... > """ > """ > Li-ion cannot absorb overcharge. When fully charged, the charge current > must be cut off. A continuous trickle charge would cause plating of > metallic lithium and compromise safety > """ > > https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries > > https://www.powerstream.com/li.htm > """ > The lithium ion battery is easy to charge. Charging safely is a more > difficult. The basic algorithm is to charge at constant current (0.2 C to > 0.7 C depending on manufacturer) until the battery reaches 4.2 Vpc (volts > per cell), and hold the voltage at 4.2 volts until the charge current has > dropped to 10% of the initial charge rate. The termination condition is the > drop in charge current to 10%. The top charging voltage and the termination > current varies slightly with the manufacturer. > > However, a charge timer should be included for safety. > > The charge cannot be terminated on a voltage. The capacity reached at 4.2 > Volts per cell is only 40 to 70% of full capacity unless charged very > slowly. For this reason you need to continue to charge until the current > drops, and to terminate on the low current. > """ > """ > When the charge rate during the constant current phase is low, the charger > process will spend less time during the constant voltage tail. If you > charge below about 0.18 C, the cell is virtually full when the 4.2 volts is > reached. This can be used as an alternative charge algorithm. Just charge > below 0.18C constant current and terminate the charge when the voltage > reaches 4.2 volts per cell. > """ > > On a 3000mAH battery, 0.18C is 540mA, so a 500mA charger would be > following this simplified algorithm -- you just need to monitor voltage and > kill the charger as appropriate. > -- > Dennis L Bieber > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/g7naue9v9idocnnlppvkl1dqiafb92gbnh%404ax.com > . > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALfn88FWBvXc4c6cTG8vsZBiBrW9%3Dng3Gc_wrGogrfa6WALB%2Bw%40mail.gmail.com.
