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Maintenance method for lithium battery

The article citations:Dongguan Yilink electronics Technology Co.,Ltd Sentiment:-Published time:2016-12-08 14:44:00

Lithium battery core over charge to the voltage is higher than 4.2V, will begin to produce side effects. The higher the charge voltage is, the higher the risk is. The lithium battery voltage is higher than 4.2V, the number of remaining cathode materials in lithium atom is less than half of the cells often beat down, let the battery capacity to produce permanent. If you continue to charge, since the negative electrode storage grid has been filled with lithium atoms, the subsequent lithium metal will be stacked on the surface of the anode material. These lithium atoms will be in the direction of the lithium ion from the negative surface to grow dendritic crystals. These lithium metal crystal will pass through the diaphragm, so that the positive and negative electrode. Sometimes the first explosion occurred before the battery in short, this is because in the charging process, the electrolyte material will produce gas cracking, so that the battery shell or drum up pressure valve rupture, allowing oxygen into and accumulate in the lithium atom reaction on the anode, and the explosion. Therefore, the lithium battery charging, we must set the voltage limit, to be able to take into account the battery life, capacity, and safety. The most ideal charging voltage limit is 4.2V.

Lithium batteries discharge also have voltage limit. When the voltage is less than 2.4V, some of the material will start to be destroyed. And because the battery will be discharged from the discharge, the longer the voltage will be lower, therefore, it is best not to put the discharge 2.4V to stop. Lithium battery discharged from the 2.4V to 3.0V during this period, the energy released only accounted for about 3% of the battery capacity. Therefore, 3.0V is an ideal discharge cut-off voltage.

When charging and discharging, in addition to the voltage limitation, the limitation of the current is also necessary. When the current is too large, lithium ions to enter the storage grid, will gather on the surface of the material. These lithium ions to obtain electrons, will be in the surface of the material to produce lithium atoms, which is the same as the charge, will cause danger. In case the battery shell bursts, it will explode. Therefore, the protection of lithium ion batteries, at least to include: the upper limit of the charge voltage, the discharge voltage, and the current limit of three. General lithium battery pack, in addition to the lithium battery core, there will be a protective plate, this piece of protective plate is mainly to provide these three protection. However, the three protection board is clearly not enough, the global lithium battery explosion or shock. To ensure the safety of the battery system, it is necessary to make a more careful analysis of the causes of the battery explosion.



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