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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