The relationship between lithium battery charge times and attenuation

The regular name is “charge and discharge cycle”, not equal to “charge times”. The cycle refers to the battery from full charge to use of light. This is a cycle. If your battery is fully charged , use one tenth. The amount of electricity is then full, and this is a very tenth cycle, so that it is charged 10 times before it is basically a loop. Similarly, from full power, use half and then fill, then use half to refill, this is also a cycle, then you are charged twice. Therefore, the loop only depends on "how much electricity is discharged from the battery", and it is not directly related to the "number of times of charging".

Moreover, the number of times of this nominal charge and discharge cycle is not said to be exhausted, but after so many cycles, the battery's ability to store power will drop to a certain extent.

For example, for a lithium battery , the nominal charge and discharge cycle is "not less than 60% of the nominal capacity after 500 times"

That is, after 500 cycles, this battery can only store as much as 60% of the battery when it is stored. It is the performance that has dropped to a certain extent.

By the way, how to use a lithium battery, use it with the rush, don't wait until there is no electricity to charge, then it is not good, diligent is right.

Lithium batteries do not have a fixed number of charging times. The batteries from regular manufacturers can be charged and discharged at least 500 times, and the capacity is maintained at 80% of the initial capacity. It can be used for 2 years. Usually, the battery of the mobile phone is charged 1000 times, which will cause the battery to be seriously unsatisfactory.

Mobile phone battery maintenance method:

1, each time fully charged, reduce the number of charging, improve battery life.

2, do not need to fully discharge the battery, usually the battery is less than 10% need to be charged.

3, use the original charger to charge, do not use universal charging.

4. Do not use the mobile phone during the charging process of the mobile phone.

5, do not overcharge, stop charging after the battery is full.

Description of relationship between charging frequency and attenuation of 12V lithium battery

12V lithium battery applications and their universal, mobile phones and digital products, tablets and notebooks, power tools, electric bicycles, electric vehicles, power supply and energy storage. Lithium batteries are also available in a variety of types.

First, charge and discharge rate

The charge and discharge rate is as high as possible. "C" is a special symbol that describes the magnitude of the battery charge and discharge current. The 1C discharge represents the amount of current that can be placed from full charge to empty within 1 hour.

The iPhone6 ??battery capacity is 1810mAH, then the 1C discharge current of this battery is 1.81 amps.

The battery capacity of each battery used in the BYD e6 electric car is 200AH, and the battery 1C discharge current is 200 amps.

If a battery is discharged at a high rate, it usually emits less energy than a low rate.

Second, the number of charge and discharge cycles

The more the number of cycles, the better. 500 times is a common value of lithium batteries, and the number of charge and discharge of lithium batteries made according to different materials ranges from 300 to 3000 times. The specific meaning of this value may be slightly different for each factory, which can be roughly understood as: the charge and discharge rate specified by the manufacturer (such as 1C discharge, 0.3C charge; each time from 0% charge to 100%, according to this cycle) After 500 cycles, the battery capacity is still 80%. The relationship between the number of charge and discharge cycles and usage habits is too great, let's take a few examples.

1. The effect of charge and discharge intensity on the number of cycles

Factory labeling: every time from 0% charge to 100%, 1C release, 0.3C charge, 500 times after the capacity decay to 80%, this is the most stringent test cycle, it can not be so strict, see below

If the cycle of electricity is 25%-75%, 1C put, 0.3C charge, after 2000 times the capacity decays to 80%

If the cycle of electricity is 25%-75%, 3C put, 0.3C charge, after 1600 capacity decay to 80%

2. The effect of shallow filling and shallow release on life

Factory labeling: every time from 0% charge to 100%, 1C release, 0.3C charge, 500 times after the capacity decay to 80%, is the most stringent test cycle, cannot be so strict, see below

The cycle of each power is 25%-75%, 1C put, 0.3C charge, after 2000 times the capacity decays to 80%

Each cycle of power is 50%-100%, 1C put, 0.3C charge, after 1800 times the capacity decays to 80%

The above two examples show that the smaller the charge and discharge rate, the more favorable the life is improved; the shallow charge and shallow release is also beneficial to the life improvement.

Third, internal resistance

The smaller the internal resistance, the better. This parameter changes with the load, temperature and temperature. As the battery life decreases, the internal resistance also increases. The battery with the lower internal resistance can be charged and discharged at a high rate. The internal resistance of the 18650 battery is about 50mΩ, and the power type 18650 battery is about 15mΩ. I want to know how much internal resistance needs to be measured with special equipment, and ordinary multimeters can't.

Fourth, battery consistency

The higher the consistency of the capacity, internal resistance, charge and discharge curves of batteries produced by the same material and the same process, the better. It is critical that the battery can form a battery pack on a large scale. The larger the battery pack, the higher the consistency requirement.

According to different application fields, detailed analysis of each parameter is made.

Lithium batteries for electronic phones such as mobile phones and tablets, lithium batteries for notebooks and mobile power supplies, lithium batteries for electric bicycles, and lithium batteries for electric vehicles.