15 Frequently Asked Questions about Lithium Batteries

BAYFIELD, Colo. - June 20, 2022 - PRLog -- 1. How is the lithium-ion safety feature achieved?

(1) The automatic shut-off protection of the diaphragm at 135°C adopts the internationally advanced Celgars2300PE-PP-PE three-layer composite film. When the temperature of the battery reaches 120°C, the membrane pores on both sides of the PE composite film are closed, the internal resistance of the battery increases, and the temperature inside the battery slows down. Warm up to ensure the battery is safe and reliable.

(2) Adding additives to the electrolyte When the battery is overcharged and the battery voltage is higher than 4.2V, the electrolyte additives and other substances in the electrolyte polymerize, the internal resistance of the battery increases greatly, and a large area of ​​open circuit is formed inside the battery. No longer heating up.

(3) The battery cover composite structure The battery cover adopts a notch explosion-proof ball structure. When the battery heats up, part of the gas generated during the internal activation process of the battery expands, and the internal pressure of the battery increases, and the pressure reaches a certain level.

(4) Various environmental abuse tests Carry out various abuse experiments, such as external short circuit, overcharge, acupuncture, impact, incineration, etc., to investigate the safety performance of the battery. At the same time, temperature shock experiments and mechanical performance experiments such as vibration, drop, and impact were carried out on the battery to investigate the performance of the battery in the actual use environment.

2. Why does the constant voltage charging current gradually decrease?

Because when the constant current process is terminated, the electrochemical polarization inside the battery remains the same level as in the whole constant current. During the constant voltage process, under the action of a constant electric field, the concentration polarization of the internal Li+ is gradually eliminated, and the migration number of ions is reduced. And the speed is manifested as a gradual decrease in the current.

3. What is the capacity of the battery?

The capacity of the battery is divided into the rated capacity and the actual capacity. The rated capacity of the battery refers to the design and manufacture of the battery that stipulates or guarantees that the battery should discharge the minimum amount of electricity under certain discharge conditions. Li-ion stipulates that the battery should be charged for 3 hours under the charging conditions controlled by normal temperature, constant current (1C) and constant voltage (4.2V). And the influence of temperature (so strictly speaking, the battery capacity should specify the charging and discharging conditions). Common units of capacity are: mAh, Ah=1000mAh).

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