-(2)Introduction to safety hazards related to lithium batteries

(2)Introduction to safety hazards related to lithium batteries
author:enerbyte source:本站 click147 Release date: 2023-12-07 08:56:11
abstract:
There are also some issues with the use of batteries, as external or internal short circuits can result in excessive currents of several hundred amperes. When there is an external short circuit, the battery instantly discharges with high current, consuming a large amount of energy on the inter...

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There are also some issues with the use of batteries, as external or internal short circuits can result in excessive currents of several hundred amperes. When there is an external short circuit, the battery instantly discharges with high current, consuming a large amount of energy on the internal resistance and generating huge heat. Internal short circuits generate high currents, causing the temperature to rise and causing the diaphragm to melt, expanding the short circuit area and forming a vicious cycle.

In order to achieve a high working voltage of 3-4. 2V for a single battery cell, lithium-ion batteries must use organic electrolytes with a decomposition voltage greater than 2V. Using organic electrolytes will be electrolyzed under high current and high temperature conditions, producing gas during electrolysis, leading to an increase in internal pressure and severe damage to the shell.

Overcharging may precipitate metallic lithium, which, in the event of shell rupture, comes into direct contact with air, causing combustion and igniting the electrolyte, resulting in a strong flame and rapid gas expansion, leading to an explosion.

In addition, regarding lithium-ion batteries for mobile phones, improper use such as squeezing, impact, and water ingress can cause the battery to expand, deform, and crack, all of which can lead to battery short circuits and cause explosions due to heat release during discharge or charging.

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