The functions and functions of the lithium battery BMS management system. The power battery also has an indispensable component, which is the BMS management system. As a powerful guarantee for the safe use of batteries, the lithium battery BMS management system enables the battery to be in a safe and controllable charging and discharging process at all times, greatly improving the cycle life of the battery in actual use.

　　Three core functions of lithium battery BMS management system

　　The three core functions of lithium battery BMS are cell monitoring, state-of-charge estimation and single cell balancing.

　　1) Battery core monitoring technology

　　Single cell voltage collection; single cell temperature collection; lithium battery pack current detection;

　　Accurate temperature measurement is also very important for the working status of the lithium battery pack, including temperature measurement of individual cells and temperature monitoring of the battery pack’s heat dissipation liquid. This requires reasonably setting the location and number of temperature sensors to form a good cooperation with the BMS control module. The monitoring of the heat dissipation liquid temperature of the lithium battery pack focuses on the fluid temperature at the inlet and outlet. The selection of monitoring accuracy is similar to that of single cells.

　　2) SOC technology: Simply put, it is how much power is left in the battery

　　SOC is the most important parameter in the BMS lithium battery management system. Because everything else is based on SOC, its accuracy and robustness (also called error correction capability) are extremely important. Without accurate SOC, no amount of protection functions can make the BMS work properly, because the battery will always be in a protected state, and the life of the battery cannot be extended.

　　The higher the SOC estimation accuracy, the higher the cruising range of electric vehicles can be for a lithium battery of the same capacity. Highly accurate SOC estimation allows the battery pack to maximize its performance.

　　3) Balance technology

　　Passive equalization generally uses resistance to release heat to release the "excess power" of high-capacity batteries to achieve the purpose of balancing. The circuit is simple and reliable, and the cost is low, but the battery efficiency is also low.

　　Active balancing transfers excess power to high-capacity cells during charging and transfers excess power to low-capacity cells during discharge, which can improve efficiency, but is more expensive, complex circuitry, and low in reliability. As cell consistency increases in the future, the need for passive equalization may decrease.

　　Why do lithium batteries need a BMS management system?

　　Although lithium batteries have more advantages than other types of batteries, there is a risk of explosion when the lithium battery is severely overcharged, causing damage to the lithium battery pack and posing a threat to the user's life safety. Therefore, the lithium battery pack must be equipped with a targeted lithium battery management system BMS to effectively monitor, protect, energy balance and fault alarm the battery pack, thereby improving the efficiency and service life of the entire lithium battery.

　　The lithium battery management system can effectively monitor, protect, energy balance and fault alarm the lithium battery pack, thereby improving the working efficiency and service life of the entire power battery pack. Lithium batteries are widely used in various precision equipment due to their many advantages such as high operating voltage, small size, light weight, high energy density, no memory effect, no pollution, small self-discharge, and long cycle life.

　　The important role of lithium battery management system BMS

　　Lithium batteries have safety issues from the time they are produced until they are recycled at the end of their life. Even if they fully comply with international safety standards when they leave the factory, they will evolve from a safe state to an unsafe state during use. The performance of good-quality single cells will gradually decline and reach the end of their life. Extremely, the performance of single batteries with poor quality will gradually experience various abnormal degradations and declines during use, and enter the unsafe state of concern. This is a gradual and cumulative process of change.

　　The lithium battery BMS management system is not dispensable as some battery manufacturers say, but a must, and it must be present throughout the battery pack application. There have been many studies on lithium battery management systems at home and abroad, and they have begun to be applied in many fields. They have been able to meet the needs of some markets. The application of lithium power batteries has put forward higher requirements for battery management systems to ensure the safety of power battery packs. , is the primary task of the lithium power battery management system.

　　The lithium battery BMS management system has the following characteristics

　　●The lithium battery management system consists of a management host (CPU), voltage and temperature acquisition module, current acquisition module and communication interface module.

　　●Can detect and display the total voltage, total current, and reserve capacity of the lithium battery pack; the voltage of any single cell and the temperature of the battery box; the highest and lowest single cell voltage and battery number, the highest and lowest temperature, and the temperature of the battery pack Charge and discharge capacity.

　　●The UPS battery host also provides alarm and control output interfaces to provide alarm and control output for extreme conditions such as overvoltage, undervoltage, high temperature, low temperature, overcurrent, and short circuit.

　　●Provides RS232 and CAN bus interfaces, which can directly read all information on the lithium battery management system on the computer.

　　The above are the functions and functions of the lithium battery BMS management system. The main purpose of the BMS lithium battery management system is to ensure the design performance of the battery system and provide functions from three aspects: safety, durability, and power.

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