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Do You Know About These Lithium Ion Batteries?
- Jul 17, 2018 -


How does the lithium ion safety feature be achieved?


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In order to ensure the safe and reliable use of Li-ion, people have carried out very strict and careful battery safety performance design to achieve the battery safety assessment index.


N 1) various environmental abuse tests

N conducts various abusing experiments, such as external short circuit, overcharge, needle punching, impact, incineration, and so on, and investigates the safety performance of the battery. At the same time, the temperature impact test and vibration, drop and impact tests of the battery were carried out to investigate the performance of the battery in actual use. Diaphragm protection at 135 degrees centigrade


N 2) adopt international advanced Celgard2300PE-PP-PE three layer composite membrane. When the temperature of the battery is up to 120 C, the membrane holes on both sides of the PE composite membrane are closed, the internal resistance of the battery is increased, the internal heating up of the battery is slowed down, and when the heating reaches 135 C, the hole of the membrane is closed, the internal circuit of the battery is broken and the battery is no longer heating up to ensure the safety and reliability of the battery.


N 3) adding additives to the electrolyte

When the battery is overcharged and the battery voltage is higher than 4.2V, the electrolyte additives are polymerized with other substances in the electrolyte, and the internal resistance of the battery increases greatly. The battery inside forms a large area of circuit breakage, and the battery is no longer heating up.


What is the charge limiting voltage? Rated voltage? Termination voltage?


A) charge limited voltage

According to the manufacturer's regulations, the battery is converted from constant current charging to constant voltage charging. The charge limit of our company is 4.2V.


N b) nominal voltage

It is used to represent the approximate value of the battery voltage.


N c) termination voltage

The load voltage of the battery is specified when the discharge is terminated, and its value is n*2.75V (the number of series connection of Li ion battery is expressed as "n").


What are the differences between Li-ion battery aluminum shell and steel shell battery?


The weight of the same type of aluminum shell battery is lighter than that of steel shell.

The capacity of N aluminum shell battery is slightly higher.


Because the internal structure of the steel shell and the aluminum shell is different, the positive and negative poles of the shell are also different. The shell of the shell of the steel shell is negative and the top is positive; the aluminum shell battery is the opposite, the shell is positive and the top is negative.

The two types of batteries do not differ greatly in internal resistance and voltage.