Briefly describe the differences between polymer lithium-ion battery and lithium-ion battery

Polymer lithium-ion battery generally refers to polymer lithium-ion battery, according to the different electrolyte materials used in lithium-ion battery, lithium-ion battery is divided into liquid lithium-ion battery and polymer lithium-ion battery or plastic lithium-ion battery. Do you know the difference between polymer Lithium Battery and lithium battery? Find out below.

First, the difference between polymer Lithium Batteries and lithium batteries

Compared to lithium-ion batteries, the characteristics of lithium polymer batteries are as follows:

1. No battery leakage problem, the battery does not contain liquid electrolyte, the use of colloidal solid.

2. Can be made into thin battery: with a capacity of 3.6V400mAh, its thickness can be as thin as 0.5mm.

3. Batteries can be designed in a variety of shapes.

4. The battery can be bent and deformed: the maximum bending of the polymer battery is about 900.

5. Can be made into a single high voltage: liquid electrolyte batteries can only be a number of batteries in series to obtain high voltage, polymer batteries.

6. Because it has no liquid, it can be made into several layers in a single piece to achieve high voltage.

7. The capacity is twice that of lithium-ion batteries of the same size.

Second, polymer lithium battery life

Correct statement: the life of a lithium battery is related to the completion of the charge cycle and not the number of charges.

For example, a lithium battery is charged half on the first day and then fully charged. If it is still the same the next day, you will have used half the charge, for a total of two discharges, which can only be counted as one charge cycle, not two. Therefore, it may normally take several charges to complete a cycle. Each time you complete a charge cycle, the charge is reduced slightly. However, the reduction is very small, high-quality batteries after multiple cycles, will still retain 80% of the original power, many lithium power supply products are still used as usual after two or three years, is the reason. Of course, lithium batteries will eventually need to be replaced.

The life of a lithium battery is generally 300 to 500 charge cycles. Assuming that the amount of electricity provided by a full discharge is Q, and not taking into account the reduction in electricity after each charge cycle, the lithium battery can provide or replenish 300Q-500Q of electricity in its lifetime. From this we know that if you charge at 1/2 every time, you can charge 600-1000 times; if you charge at 1/3 every time, you can charge 900-1500 times. Similarly, if you charge randomly, the number of times will vary. In short, no matter how it is charged, the total amount of power added to 300Q ~ 500Q is constant. Therefore, we can also understand that the life of a lithium battery is related to the total charge of the battery and has nothing to do with the number of times it is charged. Deep discharge, shallow discharge and shallow charge have little effect on the life of a lithium battery.

If lithium is used in an environment above the specified operating temperature, i.e. 35°C, the performance of the battery will continue to deteriorate, i.e. the battery will not last as long as usual. If you charge the device at such a temperature, the damage to the battery will be greater. Even if the battery is stored in a hot environment, it will inevitably damage the quality of the battery. Therefore, trying to maintain a suitable operating temperature is a good way to extend the life of lithium batteries.

If lithium 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 in some mobile phones cannot even be charged in a low temperature environment. But don't worry too much, this is only a temporary situation, unlike the use of high temperature environment, once the temperature rises, the molecules in the battery are heated and immediately return to the previous charge.

To maximise the performance of lithium-ion batteries, it is necessary to use them frequently so that the electrons in the lithium battery are always in a state of flux. If you do not use lithium very often, please remember to complete a lithium charge cycle every month and to perform a performance calibration, i.e. a deep charge.