18650 power lithium battery life is several years
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2023/05/22 11:13:43
How many years is the service life of 18650 power lithium battery? With the extension of time, the performance of 18650 lithium battery declines due to the increase of temperature and aging of the battery in the charge-discharge cycle. Manufacturers use conservative estimates, putting the cycle life of most commercial lithium-ion batteries between 300 and 500 cycles.
How many years is the service life of 18650 power lithium battery?
Now 3.7V 18650 lithium battery general cycle life can reach 500~1000 times, 3.2V 18650 general life can reach more than 2000, of course, the premise is the regular manufacturer of qualified batteries, if it is defective or counterfeit batteries, life will be very short. The 18650 lithium-ion battery has a service life of only two to three years.
Lithium-ion batteries can typically be recharged 300 to 500 times. It is best to discharge lithium batteries partially rather than completely, and to try to avoid frequent complete discharge. Once the batteries are off the production line, the clock starts ticking. Lithium batteries, whether you use them or not, have a lifespan of two to three years.
The life of 18650 lithium battery is generally 300 ~ 500 charging cycles. It is assumed that a full discharge provides a power quantity of Q. If the reduction of the power quantity after each charging cycle is not taken into account, lithium electricity can provide or supplement 300Q-500Q total power during its life. From this we know that if we charge each half, we can charge 600-1000 times; If you use 1/3 each time, you can charge 900 to 1500 times. Similarly, if the charge is random, the number of times is variable.
People often hear that the life of a lithium battery is "500 times". The "second" in the sense of lithium battery principle refers to the cycle life, that is, a full charge and discharge cycle. The test method in the industry is: Discharge depth × charging times = cycle life, the discharge depth is 80% in numerical value, at least 625 times of charge and discharge, namely 80%×625 = 500 (times).
In short, no matter how you charge it, the total amount of power you add is constant at 300Q to 500Q. Therefore, we can also understand that lithium battery life is related to the total charge capacity of the battery, and has nothing to do with the number of charges. The influence of deep discharge and shallow discharge and shallow charge on lithium battery life is not different.
How to double the service life of 18650 lithium battery?
First, lithium battery is afraid of heat and cold, do not use in extreme environment
Many people like to put lithium battery electric vehicles in the sun in summer, or park them in the yard or on the road in winter, which is very unfavorable for the service life of lithium batteries. The migration rate of lithium ions in the electrolyte and electrode is closely related to temperature. Theoretically, the temperature between -20℃ and 55℃ can be used normally.
The use of temperature between 5℃-35℃ is not harmful to lithium batteries, users in the north of the winter as far as possible to take lithium batteries back home storage, do not put outdoors, users in the south to avoid summer exposure.
Two, lithium battery do not often depth charge and discharge
Many people think that the hundreds of charging cycles of lithium battery on the electric vehicle instruction manual means that it can be used once as long as it is inserted and removed. In fact, this is a misunderstanding. The instruction actually refers to the number of complete re-discharge. In the case of excess battery charging will not shorten the service life, but also the battery maintenance, prolong its cycle, for lithium batteries, the correct way is slow charge rather than deep charge.
Three, to use adaptive charger charging, avoid large current
The chemical activity of lithium battery is much more active than lead-acid battery, higher requirements for the charger, once the use of a hybrid charger or not suitable for the fast charger, not only affect the service life of lithium battery itself, serious will also be caused by overheating caused by diaphragm damage short circuit and explosion.
In addition, the 18650 battery cell is 3C discharge, your electric vehicle is 8000W, the battery cell used is lower than your electric vehicle discharge current, which will lead to high temperature of lithium battery, too much current and short life, and there will be a bulge scrap situation, if your electric vehicle power is very large, very fast, it is recommended to choose 10C current 18650 battery. This choice of appropriate cell is obviously very important!
Four, do not need full charge storage
When the electric vehicle lithium battery (18650 cell) is bought, it is generally 2-3 grids of electricity, and few are fully charged. The storage time of full charge is long, which will reduce the capacity of lithium battery. In addition, it is also necessary to pay attention to the choice of better quality protection plate. Pay attention to these points, your electric car lithium battery will be fine for five or six years.
The above is the service life of 18650 lithium battery, daily use of lithium battery partial discharge, rather than complete discharge, and try to avoid often complete discharge.
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