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1、How are the lithium-ion safety features achieved?
a, diaphragm 135 ℃ automatic shutdown protection, the use of international advanced Celgars2300PE-PP-PE three-layer composite membrane. In the case of the battery heating up to 120 ℃, PE composite membrane on both sides of the membrane holes closed, the battery internal resistance increases, the battery internal heating slowed down. When the battery temperature rises to 135 ℃, the PP membrane holes close, the battery internal disconnection, the battery no longer warms up to ensure the safety and reliability of the battery.
b, add additives to the electrolyte in the battery overcharge, the battery voltage is higher than 4.2V conditions, electrolyte additives and electrolyte polymerisation of other substances, the battery internal resistance increased substantially, the battery internal circuit breakage, the battery is no longer warming up.
c, the battery cover composite structure battery cover using scored explosion-proof ball structure, the battery temperature, the battery internal activation process of part of the gas expansion, the battery internal pressure increases, the pressure reaches a certain level of scored rupture, deflation.
d, a variety of environmental abuse test for various abuse experiments, such as external short-circuit, overcharge, pinprick, impact, incineration, etc., to examine the safety performance of the battery. At the same time on the battery temperature impact test and vibration, drop, impact and other mechanical performance experiments, to examine the battery in the actual use of environmental performance.
2、Why is the constant voltage charging current gradually reduced?
Because when the constant current process is terminated, the electrochemical polarisation inside the battery is kept at the same level throughout the constant current, the constant voltage process, and then under the action of constant electric field, the internal Li+ concentration polarisation is gradually eliminated, and the migration number and speed of ions are manifested in the gradual decrease of current.
3、What is the capacity of the battery?
The capacity of the battery is divided into rated capacity and actual capacity. The rated capacity of the battery refers to the design and manufacture of the battery specified or guaranteed that the battery in a certain discharge conditions, the minimum amount of electricity should be discharged.Li-ion provides that the battery at room temperature, constant current (1C) and constant voltage (4.2V) control of the charging conditions of the charge 3h, the actual capacity of the battery refers to the battery in a certain discharge conditions, the actual amount of electricity discharged, mainly affected by the discharge multiplication rate and the influence of temperature (therefore) Strictly speaking, the battery capacity should specify the charging and discharging conditions). (The common units of capacity are: mAh, Ah=1000mAh).
4、What is the internal resistance of the battery?
It refers to the resistance to current flow through the battery when the battery is working. There are two parts: ohmic internal resistance and polarisation internal resistance. A large internal resistance of the battery will lead to a lower discharge voltage and shorter discharge time. The size of internal resistance is mainly affected by the battery's material, manufacturing process, battery structure and other factors. It is an important parameter to measure the performance of the battery.
Note: Generally the charging state internal resistance is the standard. Measurement of the internal resistance of the battery needs to be measured with a special internal resistance meter, but not with a multimeter ohm gear measurement.
5、What is open circuit voltage?
The open-circuit voltage is about 4.1-4.2V after fully charged, and the open voltage is about 3.0V after discharged, through the open-circuit voltage of the battery, you can judge the charging state of the battery. What is the working voltage? The discharge working voltage is around 3.6V.