Some misunderstandings in the daily use of lithium batteries

Regarding the activation of lithium batteries, many claims are: the charging time must be more than 12 hours, repeated three times in order to activate the battery. The statement that the first three charges should be charged for more than 12 hours is clearly a continuation of the statement that nickel batteries (such as nickel-cadmium and nickel-metal hydride). So this statement can be said to be misinformation at the beginning. After sampling surveys, it can be seen that a considerable number of people have confused the two battery charging methods. The correct method and precautions for the first three charging of lithium batteries. There is no need to perform extra-normal charging for the first three times, such as 12 hours to activate the battery. The charging circuit is inherently protected and it is useless to plug it in. After being left unused for a long time, or after frequent charging and using for a period of time, the solution is to fully charge and discharge the battery once, and then the battery can be charged immediately after use. Charging for a long time and completely using up the power will cause overcharge and overdischarge, which will cause permanent damage to the positive and negative electrodes of the lithium battery. From the molecular level, overdischarge will cause the negative electrode carbon to excessively release lithium ions and make the film The layer structure collapsed. Overcharging will hardly squeeze too many lithium ions into the carbon structure of the negative electrode, and some of them will no longer be able to be released. This is the reason why lithium batteries are usually equipped with charge and discharge control circuits. If a battery is not used for a long period of time, it is recommended to charge it to 40% before placing it, or look at the voltage of each cell. A single cell of 3.83V is the best storage voltage. If it is not used for a long time, it is best to reduce the power. In order to protect the battery. Finally, the life of a lithium battery is important in the current charge and discharge cycle. This cycle is an absolute concept. The last time 30% of the electricity was used, it was overflowing, and the next time it used 70% of the electricity, it was overflowing. This is just a Charging cycle. Charging method Lithium battery is quite easy to charge, but the safety of charging is the most difficult. The basic rule is to charge with a steady current until the battery reaches 4.2Vpc, and maintain a voltage of 4.2V until the charging current drops to 10% of the original charging value. This charging voltage peak and end current vary slightly depending on the battery manufacturer. But in any case, a charging timer must contain a safe design. When the battery reaches 4.2Vpc, it only reaches 40 to 70% of the full capacity. Therefore, the charger will cut off when it cannot reach this voltage value, instead of continuing to charge until the current drops, and then stop charging with a low current. Therefore, if you use a general charger, even if the voltage rises to 4.2V through the voltmeter, the battery is not fully charged, and at least 60% of the capacity is unused. Therefore, a lithium charger with a constant current and then constant voltage charging function is very necessary. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Why did the mobile power choose the polymer lithium battery?