Introduce the core functions of Li-ion battery BMS management system

Functions and functions of Li-ion battery BMS management system. The power lithium battery also has an indispensable part, the BMS management system. The lithium-ion battery BMS management system is a powerful guarantee for the safe use of the battery, so that the battery is always in a safe and controllable charge and discharge process, which greatly improves the cycle life of the battery during actual use. Li-ion battery BMS management system has three core functions. The three core functions of lithium-ion battery BMS are battery monitoring, state-of-charge estimation and cell balancing. Lithium-ion battery BMS management system. jpg1) Cell monitoring technology Single battery voltage acquisition; single battery temperature acquisition; lithium-ion battery current detection; accurate temperature measurement is also very important to the working status of lithium-ion batteries, including single battery temperature measurement and battery cooling liquid temperature monitoring. It is necessary to reasonably set the position and number of temperature sensors to form a good cooperation with the BMS control module. The key to the liquid temperature monitoring of lithium-ion batteries is the liquid temperature at the entrance and exit, and its monitoring accuracy is equivalent to that of a single battery. 2) SOC technology: In simple terms, SOC is the most important parameter in the BMS lithium-ion battery management system. Because everything else is based on SOC, the accuracy and robustness of SOC ( Also called error correction) is extremely important. Without an accurate SOC, no amount of protection can make the BMS work normally, because the battery is always in a protected state, and the battery life will not be extended. The higher the accuracy of the SOC estimation, the greater the range of lithium-ion batteries of the same capacity. High-precision SOC estimation can maximize the performance of the battery pack. 3) Balance technology Passive balance generally uses resistance heat to release the extra power of the large-capacity battery, so as to achieve the purpose of balance. The circuit is simple and reliable, and the cost is low, but the battery efficiency is also low. During active balance charging, the surplus electric energy is transferred to the large-capacity battery, and when discharging, the surplus electric energy is transferred to the small-capacity battery, which can improve the use efficiency, but the cost is high, the circuit is complicated, and the reliability is low. In the future, with the improvement of cell consistency, the demand for passive balance may decrease. Why do lithium-ion batteries need a BMS management system? Although lithium-ion batteries have more advantages than other types of batteries, when lithium-ion batteries are seriously overcharged, there is still a risk of explosion, which will damage the lithium-ion battery pack. The life safety of users is threatened. Therefore, it is necessary to equip lithium-ion batteries with a set of targeted lithium-ion battery management system BMS to effectively monitor, protect, energy balance and fault alarms to improve the working efficiency and service life of the entire lithium-ion battery. The lithium-ion battery management system can effectively monitor, protect, energy balance and fault alarms for lithium-ion battery packs, thereby improving the working efficiency and service life of the entire battery pack. Lithium-ion batteries are widely used in various precision equipment due to their high working voltage, small size, light weight, high energy density, no memory effect, no pollution, low self-discharge, long cycle life and other advantages. Important use of lithium-ion battery management system BMS lithium-ion batteries until the completion of life, there are safety problems, even if the factory fully complies with international safety standards, in the process of use, it will evolve from a safe state to an unsafe state, a good quality single battery The performance gradually declines to a limit, and the bad quality of the single battery will gradually use various abnormal degradation in the process of its performance, and enter a state of fear of insecurity. This is a process of cumulative change. Lithium-ion battery BMS management system is not as optional as some battery manufacturers say, but must have, and it also runs through the application of battery packs. Lithium-ion battery management systems have been studied at home and abroad, and have begun to be applied in many fields. They have been able to meet the needs of some markets. The application of lithium-ion battery management systems has put forward higher requirements to ensure the safety of using power lithium batteries. The important task of the battery management system. 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: Classification, advantages and applications of 18650 lithium ion batteries