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Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. The battery does not contain metallic lithium ions and can be charged. Lithium metal batteries are the fifth generation of rechargeable batteries, and their safety, specific capacity, self-discharge rate and performance-price ratio are superior to those of lithium-ion batteries. So how long can lithium-ion batteries last? What is battery life related to?
1. How long can lithium-ion batteries last?
Most consumers have heard of it: the life of a lithium battery is 500 times. This does not refer to the number of times of charging, but a cycle of charging and discharging. If this number of times is exceeded, the battery falls asleep. In order to prolong the life of the battery, many people charge the battery every time when the battery is completely exhausted. How long can the lithium-ion battery last? The answer is that it will not increase the service life.A charging cycle means that the full capacity of the battery is used from full to empty, and then from empty to full. This is not equal to a charge. For example, a lithium battery consumes only half of its power on the first day, and then is fully charged. If the situation is the same the next day, that is, charge with half of the battery, and charge it twice in total. This will only be counted as one charge cycle, not twice. So before completing a cycle, it usually requires multiple charging to complete. So how long can lithium-ion batteries last? After each charging cycle, the battery capacity will be reduced. However, the reduction in this amount of power is very small. High-quality batteries can still maintain 80% of their original capacity after multiple recharges. Many lithium battery products can still be used as usual after two or three years of use. Of course, the lithium battery still needs to be replaced at the end of its use.
2. How long can lithium-ion batteries last? What are the battery life related to?
Due to various influences in real life, especially the depth of discharge during charging is not constant, so "500 charging cycles" is only used as a reference. In other words, the life of a lithium battery is related to the completion of the charging cycle, not directly related to the number of charging cycles. To put it simple, only half of the electricity is consumed on the first day, and then it is fully charged again.
how long can lithium-ion batteries last? The lifespan of digital lithium batteries is generally 300 to 500 times, and the cycle life of some power lithium-ion batteries is much longer than that of digital products, generally reaching more than 2000 times.
Dongguan Power Long Battery Technology CO., Ltd. currently produces lithium iron phosphate lithium-ion power batteries with a cycle life of more than 8,000 times. The cycle life of the battery is also closely related to the temperature of the charge and discharge environment, the charge and discharge rate, and the depth of charge and discharge. The higher the charge-discharge rate, the worse the cycle life, the higher or the lower the charge-discharge temperature will also affect the cycle life of the battery. Regarding the depth of discharge and charge (DOD): usually academically, the operating life of the battery can be evaluated through the equivalent full cycle life (EFC). Generally, the smaller the DOD, the longer the cycle life of the battery.