How to protect custom lithium-ion batteries

After the lithium-ion battery cell is overcharged to a voltage higher than 4.2V, side uses will begin to appear. The higher the overcharge voltage, the higher the risk. After the voltage of the customized lithium-ion battery cell is higher than 4.2V, the number of lithium-ion atoms remaining in the positive electrode material is less than half. At this time, the storage cell often collapses, causing the battery capacity to drop. If you continue to charge, since the storage cell of the negative electrode has been filled with lithium ion atoms, the subsequent lithium ion metal will accumulate on the surface of the negative electrode material. These lithium ion atoms will grow dendrites from the surface of the negative electrode to and from the lithium. These lithium ion metal crystals will pass through the separator paper and short-circuit the positive and negative electrodes. Sometimes the battery explodes before the short circuit occurs. This is because during the overcharging process, the electrolyte and other materials will crack and produce gas, causing the battery shell or pressure valve to swell and rupture, allowing oxygen to enter and react with the lithium ion atoms accumulated on the surface of the negative electrode. , And then exploded. Therefore, when charging a lithium-ion battery, the upper voltage limit must be set so that the battery's life, capacity, and innocuousness can be taken into account at the same time. The ideal upper limit of the charging voltage is 4.2V. There is also a lower voltage limit when discharging lithium ion batteries. When the cell voltage is lower than 2.4V, some materials will begin to be destroyed. Also, because the battery will self-discharge, the longer it is left, the lower the voltage will be. Therefore, do not stop when the battery is discharged to 2.4V. During the period from 3.0V to 2.4V discharge of lithium-ion batteries, the energy released only accounts for about 3% of the battery capacity. Therefore, 3.0V is an ideal discharge cut-off voltage. When customizing the charging and discharging of lithium-ion batteries, in addition to the voltage limit, the current limit is also necessary. When the current is too large, the customized lithium-ion battery will not have time to enter the storage cell and will gather on the surface of the material. After these lithium obtain electrons, lithium ion atoms will crystallize on the surface of the material, which is the same as overcharging and can cause danger. If the battery casing ruptures, it will explode. Therefore, the protection of customized lithium-ion batteries must include at least three items: the upper limit of charging voltage, the lower limit of discharge voltage, and the upper limit of current. Generally, in custom-made lithium-ion battery packs, in addition to custom-made lithium-ion battery cells, there will be a protective board. This protective board is important to provide these three protections. However, these three protections of the protection board are obviously not enough, and there are still frequent explosions of lithium-ion batteries around the world. To ensure the stability of the battery system, it is necessary to conduct a more careful analysis of the cause of the battery explosion, so that the lithium-ion battery can be better protected and used. When customizing the charging and discharging of lithium-ion batteries, in addition to the voltage limit, the current limit is also necessary. When the current is too large, the customized lithium-ion battery will not have time to enter the storage cell and will gather on the surface of the material. After these lithium gain electrons, lithium ion atoms will crystallize on the surface of the material, which is the same as overcharging and can cause danger. If the battery casing ruptures, it will explode. The protection of customized lithium-ion batteries should include at least: ①the upper limit of charging voltage; ②the lower limit of discharge voltage; ③the upper limit of current. In general custom lithium-ion battery packs, in addition to custom lithium-ion battery cells, there will be a protection board. This protection board is important to provide these three protections. However, the three protections of the protection board are obviously not enough. Global lithium Ion battery explosion incidents are still frequent. To ensure the stability of the battery system, it is necessary to conduct a more careful analysis of the cause of the battery explosion, so that the lithium-ion battery can be better protected and used for its purpose. Choosing a custom manufacturer of lithium-ion batteries requires that the manufacturers of custom-made lithium-ion batteries have a certain grasp of the needs of lithium-ion battery styles, such as the customization of battery size, performance, and customization according to the environment. The safety and stability of lithium-ion batteries are also a must. Everyone should know that lithium-ion batteries have potential safety hazards of spontaneous combustion and explosion, not to mention inferior lithium-ion batteries. Therefore, the safety and reliability of lithium-ion batteries is the most basic requirement. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Comparison of the safety of various types of lithium-ion batteries