Generally lithium batteries can be recharged/discharge 300 to 500 times.It is better to discharge the lithium battery partially rather than completely, and to avoid frequent full discharge as much as possible. The life of a lithium battery lies in its first few years, whether you use it or not.The decrease in battery capacity is due to an increase in internal resistance due to oxidation (which is the main cause of the decrease in battery capacity).Finally, the cell resistance reaches a point at which, although the battery is fully charged, it cannot release the stored electricity.
The aging rate of lithium battery is determined by temperature and charging conditions. The following table shows the reduction of battery capacity under two kinds of parameters.
Temperature charge 40% charge 100%
0°C 98% capacity after one year and 94% capacity after one year
25°C 96% capacity after one year and 80% capacity after one year
40°C 85% capacity after one year and 65% capacity after one year
60°C 75% capacity after one year and 60% capacity after one year
As can be seen from the figure, high charging state and increased temperature accelerate the decline of battery capacity.
Experimental data graph
Influencing factor 1: Discharge depth and rechargeable times
As can be seen from the figure on the left obtained by the experiment, the number of charging is related to the discharge depth. The deeper the discharge depth of the battery is, the less the number of charging times will be.
Charging times * discharge depth = total number of charging cycles completed, the higher the total number of charging cycles completed, the higher the battery life, the number of available charging times * discharge depth = actual battery life (ignoring other factors)
Influencing factor 2: Overcharge, overdischarge, and large charging and discharging currents
Avoid overcharging the battery. Any kind of overcharging of a lithium-ion battery can cause serious damage to the battery's performance and even cause it to explode.
Avoid large charging and discharging currents, which put too much pressure on the battery.
Influencing factor 3: An overheated or undercooled environment
Temperature also has a great influence on lithium battery life. A subfreezing environment can burn a lithium battery as soon as it is opened, while an overheated environment can reduce the battery's capacity.
Influencing factor 4: Long time full power / no power state
Too high and too low power state has a negative effect on the life of lithium battery. Most electrical appliances or batteries are labeled with the number of times they can be recharged, which is based on the discharge of 80% of the benchmark test. Lithium-ion batteries are recommend to be kept in the middle of the range, where they will have the longest battery life.
From the above, the following points can be summarized to prolong the capacity and life of lithium battery matters needing attention.
Be sure not to let the battery drain (shut down automatically).
If you're traveling, you can recharge your batteries, but you can charge your appliances whenever you can.
Use items
Firstly, keeping lithium-ion batteries properly charged and discharged can prolong battery life.Maintaining the lithium ion battery power level between 10% and 90% is help for protecting the battery.
Secondly, it is best to turn off digital products equipped with lithium-ion batteries when they are exposed to the sun or stored in hot cars, because lithium-ion batteries can age faster if they run at temperatures above 60 degrees Celsius.
Lithium battery charging temperature range: 0~45 ℃, lithium battery discharge temperature range: 0~60 ℃.
Thirdly, in general, 50% of the charge is best for lithium-ion battery storage.
Using Methods
The battery memory effect refers to the reversible failure of the battery, that is, the performance that can be recovered after battery failure.The memory effect is when the battery is subjected to a particular cycle of work for a long time and automatically maintains this particular tendency.
Suggestion 1: it is unnecessary and harmful to discharge the battery before each charge, because the service life of the battery is unnecessarily shortened.
Suggestion 2: it is not advisable to use a resistor to connect the positive and negative electrode of the battery to discharge. The current cannot be controlled, and it is easy to put it into 0 V, even causing the battery polarity reversal in the series battery pack.
It will take a long time for the battery from factory to reach the user, and the battery electrode material will be passivated. Therefore, it is recommended that the battery should be fully charged/discharged for 3-5 times so as to eliminate the passivation of the electrode material and reach the maximum capacity
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