How long is the life of the lithium battery? This is the question of many users, usually, we only know how many times the lithium battery can be recycled, but in the actual application found that this value is greatly discounted, so in the end, the lithium battery can be used for several years? The next Ryding electronic editor to tell you one by one; the
The fifth generation of rechargeable batteries lithium metal battery was born in 1996, its safety, capacity ratio, self-discharge rate and performance-to-price ratio are better than lithium-ion batteries. Due to its own high technical requirements restrictions, now only a few countries companies are producing such lithium metal batteries. Lithium-ion batteries do not contain lithium in metallic form and are rechargeable. Lithium-ion batteries currently account for the majority of the market.
Battery life; lithium batteries in the end how long can be used?
Lithium-ion batteries can only be charged and discharged 500 times? I believe that the vast majority of consumers have heard that the life of lithium batteries is "500 times", 500 times charge and discharge, more than this number of times, the battery "end of life", many friends in order to extend the life of the battery, each time the battery power is completely exhausted In order to extend the life of the battery, many friends every time the battery is completely depleted before charging, so that the battery life really has an extended role? The answer is no. The life of the lithium battery is "500 times", referring not to the number of charges, but a charge and discharge cycle.
A charge cycle means that all the power of the battery from full to empty, and then from empty to full process, which is not the same as charging once. For example, a lithium battery on the first day only half of the charge, and then fully charged for it. If it is still so on the second day, i.e., charged with half, and charged down twice in total, this can only be counted as one charging cycle, not two. Therefore, it may usually take several charges to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. However, this reduction in power is very small, and high-quality batteries will still retain 80% of their original capacity after charging through multiple cycles, and many lithium-powered products are still used as usual after two or three years. Of course, the lithium battery life to the final after still need to be replaced.
And the so-called 500 times, refers to the manufacturer at a constant depth of discharge (such as 80%) to achieve a chargeable number of about 625 times, reaching 500 charging cycles.
(80% * 625 = 500) (ignoring factors such as lithium battery capacity reduction)
Due to the various effects of real life, especially the depth of discharge when charging is not constant, so "500 charge cycles" can only be used as a reference battery life.
The correct statement: lithium battery life and the number of completed charging cycles, and the number of charge is not directly related.
Simply understand, for example, a lithium battery only uses half of its charge on the first day, and then it is fully charged again. If it does so again on the second day, i.e., it is charged when half of it is used, for a total of two charges down, this only counts as one charge cycle, not two. Therefore, it may usually take several charges to complete a cycle. Each time a charge cycle is completed, the power level decreases a little. However, the reduction is very small, high-quality batteries charged through multiple cycles, will still retain 80% of the original power, many lithium-powered products are still used as usual after two or three years, for this reason. Of course lithium battery life to eventually need to be replaced.
How many years does a lithium battery generally last?
The life span of a lithium battery is generally 300 to 500 charge cycles. Assuming that a complete discharge provides Q, such as not taking into account the reduction of power after each charge cycle, the lithium battery can provide or replenish a total of 300Q-500Q of power during its life. From this we know that if it is charged with 1/2 at a time, it can be charged 600-1000 times; if it is charged with 1/3 at a time, it can be charged 900-1500 times. And so on, if random charging, the number of times is variable. In short, no matter how to charge, the total replenishment into 300Q ~ 500Q of power this point is constant. Therefore, we can also understand that: the life of the lithium battery and the total charge power of the battery, and the number of times to charge has nothing to do with. Deep discharge deep charge and shallow discharge shallow charge for lithium battery life is not very different.
In fact, shallow discharge shallow charge is more beneficial for lithium battery, only when the power module of the product is calibrated for lithium battery, there is a need for deep discharge deep charge. Therefore, the use of lithium-ion-powered products do not have to stick to the process, everything to the convenience of the first, charge at any time, do not have to worry about affecting the life.
If the lithium battery is used in an environment higher than the specified operating temperature, i.e., above 35°C, the battery power will be constantly reduced, i.e., the battery will not be powered for as long as usual. If you have to charge the device at such temperature, it will cause more damage to the battery. Even if the battery is stored in a hotter environment, it will inevitably cause corresponding damage to the quality of the battery. Therefore, try to maintain in the moderate benefit of the operating temperature is a good way to extend the life of the lithium battery.
If the lithium battery is used in a low-temperature environment, i.e. below 4°C, you will also find that the battery life is reduced, and the original lithium battery of some cell phones cannot even be charged in a low-temperature environment. But don't worry too much, this is only a temporary condition, unlike the use in high temperature environment, once the temperature rises, the molecules in the battery are heated up and it immediately returns to the previous power level.
To maximize the effectiveness of lithium-ion batteries, you need to use it often, so that the electrons within the lithium battery is always in a state of flow. If you don't use lithium-ion batteries often, please remember to complete a monthly charge cycle for lithium-ion batteries, do a power calibration, that is, deep discharge and deep charge once.
The regular name is "charge/discharge cycle", not equal to "charge times", the cycle refers to the battery from full charge to exhaust, which is a cycle, if your battery from a full state, with a tenth of the power, and then full again, which is a tenth of the cycle, so that the charge 10 times, before basically considered a cycle. Similarly, from a full charge, used half and then full, and then used half and then full, which is also a cycle, this time you are charged twice. Therefore, the cycle is only dependent on the "cumulative discharge from the battery how much electricity", and the "number of charges" is not directly related.
And the nominal number of charge/discharge cycles is not to say that the exhausted can not be used, but after doing so many cycles, the battery's ability to store power will be reduced to a degree.
For example, a lithium battery, the nominal charge and discharge cycle is "500 times after not less than 60% of the nominal capacity"
That is, after 500 cycles, the battery can only store up to 60% of the new battery so much electricity, is a certain degree of performance decline, is the meaning of this
Lithium batteries do not have a fixed number of charge limits, regular manufacturers out of the battery can generally charge and discharge at least 500 times, and the capacity to maintain more than 80% of the initial capacity, a day a charge can be used for 2 years. Usually cell phone battery charging 1000 times, it will cause the battery is seriously not durable.
How long is the life of the lithium battery?
According to experimental results, the life of the lithium battery is with with the number of times the charge increases and decays, the general lithium battery charge is 2000-3000 times; here is not talking about the full cycle cycle.
Cycle is the use, we are using the battery, the concern is the use of time, in order to measure how long the rechargeable battery can be used in the end such a performance, it provides the definition of the number of cycles. The actual user use is highly variable, because the conditions of different tests are not comparable, to have a comparison must regulate the definition of cycle life.
The national standard for lithium battery cycle life test conditions and requirements: in the ambient temperature of 20 ℃ ± 5 ℃, 1C charging, when the battery terminal voltage reaches the charging limit voltage of 4.2V, change to constant voltage charging until the charging current is less than or equal to 1/20C, stop charging, set aside 0.5h ~ 1h, and then discharged with 1C current to the termination voltage of 2.75V, after the end of discharge, set aside 0.5h~1h, then the next charging and discharging cycle until two consecutive discharging time is less than 36min, then the life is considered to be terminated, and the number of cycles must be greater than 300 times.
The interpretation of the provisions of the national standard.
A. This definition specifies that the cycle life test is carried out by deep charging and discharging
B. provides that the cycle life of lithium batteries according to this model, after ≥ 300 cycles still have more than 60% capacity
However, different cycle system to get the number of cycles is very different, for example, the other conditions remain unchanged, only the constant voltage of 4.2V to 4.1V constant voltage for the same type of battery cycle life test, so that the battery is not deep charging mode, the final test can be increased by nearly 60% cycle life. Then if the cut-off voltage is increased to 3.9V for testing, the cycle number should be increased several times.
This statement about cyclic charging and discharging once less life, we should note that the definition of lithium battery charging cycle: a charging cycle refers to the process of charging all the power of the lithium battery from full to empty, and then from empty to full. And this is not the same as charging once. In addition, we can not ignore the conditions of the cycle when talking about the number of cycles, leaving aside the rules to talk about the number of cycles is not meaningful, because the number of cycles is a means of detecting the life of the battery, not the purpose!
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