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How long does a lithium battery last?

13 Jan 2020 - Lithium ion battery Lithium batteries Lithium ion batteries

Lithium ion battery ", is a kind of lithium metal or lithium alloy for the cathode material, the use of non-aqueous electrolyte solution of the battery.Lithium metal batteries were first used in 1912

Lithium batteries can be divided into two categories: lithium metal batteries and lithium ion batteries.Lithium-ion batteries do not contain metallic lithium and are rechargeable.The fifth generation of rechargeable battery lithium metal battery was born in 1996, and its safety, specific capacity, self-discharge rate and performance ratio are better than lithium ion battery.Limited by its own high technology requirements, only a handful of companies in a handful of countries now manufacture such lithium-metal batteries.

Battery life

Lithium ion batteries can only be charged and discharged 500 times?

Believe that the vast majority of consumers have heard of, the life of the lithium battery is "500", 500 times more than the number of times, the battery will "die", many friends in order to be able to extend battery life, each time to charge when the battery run out completely, so really have a longer effect on battery life?The answer is no.Lithium battery life is "500 times", not the number of charges, but a cycle of charge and discharge.

 

A charge cycle means that the battery is charged from full to empty, and then from empty to full, which is not the same as a charge.A lithium battery, for example, USES half its charge on the first day and then charges it again.If that's the case the next day, charge it in half and come down twice in total. That counts as one charge cycle, not two.As a result, it may take several charges to complete a cycle.After each charge cycle, the battery's capacity decreases a bit.However, this reduction is so small that a high-quality battery will retain 80% of its original capacity after many cycles of charging, and many lithium-ion products will still be in use after two or three years.Of course, lithium battery life to the end is still need to replace.

 

The so-called 500 times, refers to the manufacturer at a constant discharge depth (such as 80%) to achieve about 625 times of charging times, up to 500 charging cycles.

(80%*625=500) (ignoring lithium battery capacity reduction and other factors)

However, due to various influences in real life, especially the discharge depth during charging is not constant, so "500 charging cycles "can only be used as a reference for battery life.

Correct statement: lithium battery life and the completion of the charging cycle of the number of times, and the number of charges is not directly related.

A simple way to think about it is, for example, a lithium battery USES half its charge on the first day and then charges it again.If that's the case the next day, charge it in half and come down twice in total. That counts as one charge cycle, not two.As a result, it may take several charges to complete a cycle.After each charge cycle, the charge is reduced a bit.However, the reduction is very small, with high-quality batteries still retaining 80% of their original charge after many cycles, which is why many lithium-ion products are still in use after two or three years.Of course, lithium battery life eventually need to be replaced.

 

Lithium battery life is generally 300 ~ 500 charging cycles.Assuming that the electric quantity provided by a complete discharge is Q, if the reduction of electric quantity after each charging cycle is not taken into account, a total of 300q-500q electric power can be provided or supplemented by lithium in its lifetime.From this we know that if you charge with 1/2 each time, you can charge 600-1000 times.If you charge it every time you use 1/3, you can charge it 900 to 1500 times.By the same token, if the battery is randomly charged, the number of charges varies.So anyway, no matter how you charge it, you're going to get a total of 300Q to 500Q of power and this is constant.Therefore, we can also understand that lithium battery life is related to the total charge of the battery, and has nothing to do with the number of charges.The effect of deep charge and shallow charge on lithium battery life is not different.

 

In fact, shallow charging is more beneficial for lithium battery. Deep charging is necessary only when the power module of the product is calibrated for lithium battery.Therefore, the use of lithium electric power products do not have to stick to the process, everything for convenience, charging at any time, do not have to worry about the impact of life.

If a lithium battery is used at an operating temperature above the required operating temperature of 35°C, the battery will continue to decline in power, meaning that the battery will not last as long as usual.If you have to charge the device at these temperatures, the damage to the battery will be even greater.Even if the battery is stored in a hot environment, it will inevitably cause corresponding damage to the battery quality.Therefore, it is a good way to prolong the life of lithium battery to keep the operating temperature at suitable.

 

If you use a lithium battery in a low temperature environment, i.e. under 4°C, you will also find that the battery life is reduced, and the original lithium battery of some mobile phones cannot even be charged in a low temperature environment.But don't worry too much, this is just a temporary situation, unlike in a hot environment, where once the temperature rises and the molecules in the battery heat up, they immediately return to their previous charge.

To get the most out of a lithium-ion battery, you need to use it often enough to keep the electrons flowing.If you do not often use lithium battery, please remember to complete a charging cycle for lithium battery every month, do a battery calibration, that is, deep charging.

The normal name is "charge and discharge cycle", not equal to "charge times", cycle refers to, the battery from full to use up, this is a cycle, if your battery from full state, used a tenth of the charge, and then full again, this is a tenth of the cycle, such charge 10 times, is basically a cycle.Again, from full charge, half used and then full, and half used and then full again, this is also a cycle, where you're charged twice.So, the cycle is just a matter of "how much power is released from the battery", not "how many charges"

 

And the nominal number of charge and discharge cycles doesn't mean that you can't use it after using it, but that after doing so many cycles, the battery's capacity to store power drops to a point where,

For example, for a lithium battery, the nominal charge-discharge cycle is "no less than 60% of the nominal capacity after 500 times".

So after 500 cycles, this battery can only store at most 60% of the power of the new battery

Lithium battery does not have fixed charge times limit, the battery that normal manufacturer comes out can charge and discharge 500 times commonly at least, and capacity maintains in initial capacity 80% above, a day can use 2 years.Cell phone batteries are usually charged for 1,000 times, resulting in a serious lack of durability.

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