Gasoline Chain Saw side effects when lithium battery cells were overcharged to voltages higher than 4.2V. The higher the overcharge voltage, the higher the risk. After the lithium cell voltage is higher than 4.2V, the number of lithium atoms remaining in the positive electrode material is less than half, and the storage cell often breaks down, causing a permanent capacity loss of the battery. If you continue to charge, because the negative cell has been filled with lithium atoms, subsequent lithium metal will accumulate on the surface of the negative material. These lithium atoms will grow dendritic crystals from the negative surface in the direction of the lithium ions. These lithium metal crystals can pass through the diaphragm and short-circuit the positive and negative electrodes. Sometimes the battery explodes before the short circuit occurs, because during the overcharge process, materials such as electrolyte decompose and produce gas, making the battery housing or pressure valve bulge and rupture, allowing oxygen to go in and react with lithium atoms piled on the negative surface, and then explode.
Therefore, the Gasoline Chain Saw that when the lithium battery was charged, the voltage upper limit must be set to take into account the battery life, capacity, and safety. The ideal charging voltage is up to 4.2V. Lithium battery should also have a lower voltage limit when discharging. When the cell voltage is below 2.4V, part of the material will begin to be destroyed. And because the battery will self-discharge, the longer the voltage will be lower, so do not stop when discharging at 2.4V. Gasoline Chain Saw that during the period of discharge from 2.8V to 2.4V, the energy released by the lithium battery accounted for only about 3% of the battery capacity. Therefore, 2.8V is an ideal cut-off voltage for discharge. When charging and discharging, in addition to voltage restriction, current restriction is also necessary. When the current is too large, lithium ions have no time to enter the storage cell and will gather on the surface of the material.
When these lithium ions gain electrons, they crystallize lithium atoms on the surface of the material, which, like overcharging, can be dangerous. If the battery case breaks, it will explode. Therefore, the protection of lithium-ion batteries, at least include: charging voltage upper limit, discharge voltage lower limit, and current upper limit three. Generally, in the Gasoline Chain Saw lithium battery pack, in addition to the Gasoline Chain Saw lithium battery core, there will be a protective plate, which mainly provides these three protections. However, these three protections of the protection board are obviously not enough, and the global Gasoline Chain Saw lithium battery explosions. To ensure the safety of the battery system, the cause of the battery explosion must be more carefully analyzed.
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