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There are also some issues with the use of batteries, as external or internal short circuits can cause 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 form a large current, causing the temperature to rise, 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. Organic electrolytes used under high current and high temperature conditions will be electrolyzed, resulting in gas formation during electrolysis, leading to an increase in internal pressure and severe damage to the shell.
Overcharging may precipitate metal lithium ions, which can come into direct contact with air in the event of shell rupture, leading to combustion and igniting the electrolyte, causing a strong flame, rapid gas expansion, and explosion.
In addition, regarding lithium-ion batteries for mobile phones, improper use, such as squeezing, impact, and water ingress, can lead to battery expansion, deformation, and cracking, which can lead to battery short circuits and release heat during discharge or charging, causing explosions.
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