Introduce the design method of equalizing charging of lithium ion battery pack protection board

The power group uses lithium-ion batteries. The charged lithium-ion batteries need voltage, discharge voltage, over-current, and short-circuit protection. In order to achieve the problem of the entire battery balancing charging and charging process, a section introduces any number of lithium-ion battery protection chips. The level array includes the battery protection function designed by the balanced charging lithium-ion battery protection board. Simulation results and industrial applications show that the protection board has the advantages of complete protection functions, stable operation, high cost performance, and charging error balance less than 50mV. Commonly used equalization charging techniques include: constant shunt resistance equalization charging, switching shunt resistance equalization charging, average battery voltage equalization charging, switched capacitor equalization charging, buck converter equalization charging, inductance equalization charging, etc. When lithium-ion batteries are charged in series, each battery must be evenly charged, otherwise the performance and life of the entire battery will be affected during use. However, the existing single-chip lithium-ion battery protection chip does not have a balance charge control function, and the multi-chip lithium-ion battery protection chip balance charge control function requires an external CPU. Through serial communication with the protection chip (such as the I2C bus), the complexity and design difficulty of the protection circuit are added, the efficiency and reliability of the system are reduced, and the power consumption is increased. The power group uses lithium-ion batteries. The charged lithium-ion batteries need voltage, discharge voltage, over-current, and short-circuit protection. In order to achieve the problem of the entire battery balancing charging and charging process, a section introduces any number of lithium-ion battery protection chips. The level array includes the battery protection function designed by the balanced charging lithium-ion battery protection board. Simulation results and industrial applications show that the protection board has the advantages of complete protection functions, stable operation, high cost performance, and charging error balance less than 50mV. Lithium-ion battery protection board balanced charging principle structure The number of protection chips for a single lithium-ion battery should be determined according to the number of lithium-ion battery packs and the number that should be used in series to protect the corresponding single lithium-ion battery's charge-discharge, over-current and short-circuit conditions. At the same time of charging protection, balanced charging is realized by protecting the chip and controlling the on and off of the parallel discharge branch switch device. This method is different from the traditional equalization charging at the charger end, and reduces the design and application cost of the lithium-ion battery charger. 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: What is a disposable battery? Explain the working principle of disposable batteries in detail