Analysis of the purpose and selection points of lithium battery protection board

The purpose of the lithium battery protection board: lithium battery protection board.jpg The finished lithium battery pack has two parts, the lithium battery core and the protection board. The lithium battery core is mainly composed of positive plate, diaphragm, negative plate and electrolyte; positive plate , Diaphragm and negative plate are wound or laminated, packaged, filled with electrolyte, and made into batteries after packaging. Many people do not know the purpose of lithium battery protection board. Lithium battery protection board, as the name suggests, is used to protect lithium batteries. The purpose of the protection board is to protect the battery from over-discharge, over-charge, over-current, and output short-circuit protection. The reason why lithium battery (rechargeable type) needs to be protected is determined by its own characteristics. Because the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuited, and ultra-high temperature charging and discharging, the lithium battery package will always appear with an exquisite protection board and a current fuse. Key points for selecting lithium battery protection board: In order to protect the life of the lithium battery pack, it is recommended that the battery charging voltage should not exceed 3.6v at any time, that is, the protection voltage of the lithium battery protection board should not be higher than 3.6v, the balanced voltage is recommended 3.4v-3.5v, and the battery is discharged The protection voltage is generally above 2.5v. The charger proposes a maximum voltage of 3.5 strings. The greater the self-discharge, the longer the balance will take. The cells with excessive self-discharge are already difficult to balance and must be eliminated. So when choosing a lithium battery protection board, try to choose 3.6v overvoltage protection, 3.5v or so to start the balance. In short, the lower the internal resistance of the lithium battery protection board, the better, and the lower it is, the less heating it is. The current limit of the protection board is determined by the constantan wire sampling resistance, but the continuous current capability is determined by the mos. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Analysis of the identification and solution of scrap batteries