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Lipo battery 3s management system and its necessity

How much do you know about lipo battery 3s management system? What is the significance of the lipo battery 3s management system? What are the specific parts of the lipo battery 3s management system and what are the functions of each part? How many of the above questions can you answer? If you have doubts about the above problems, then you may wish to find out with the CNHL lithium lipo battery 3s manufacturer.

Brief introduction of lipo battery 3s management system

The lipo battery 3s management system is a hardware and software system that monitors, controls and protects the power lipo battery 3s group. lipo battery 3s management system consists of main controller, parameter acquisition and evaluation system, balance management system, energy management system, thermal management system, safety protection system, communication and data storage system.

The necessity of lipo battery 3s management system

The lipo battery 3s management system (BMS) is the link between the user and the lipo battery 3s. It is a system for managing the lipo battery 3s. It usually has the function of measuring voltage, current and temperature to prevent over-discharge, over-charge and over-temperature. The occurrence of high-level abnormal conditions.
The following lithium lipo battery 3s manufacturer CNHL will introduce each subsystem and its important functions.

Detailed explanation of lipo battery 3s management system structure

Parameter acquisition and evaluation system for lipo battery 3s

Collect key parameters such as lipo battery 3s group voltage, single lipo battery 3s voltage, series current, and lipo battery 3s working temperature in real time. Information such as voltage, current and temperature is the basis for functions such as energy estimation and balance management.
Therefore, the stable and reliable parameter acquisition module can provide real-time and accurate data information for the entire BMS. The main controller of the BMS will establish a suitable mathematical model according to the working characteristics of the lithium lipo battery 3s, which is suitable for various lipo battery 3s. Algorithms such as Kalman filtering process the data to accurately estimate the SOC of the lipo battery 3s, and then realize the evaluation of the state of health (SOH) of the lipo battery 3s.

Balance management system for 2 lipo battery 3s

It is a key system to control the difference between the lipo battery 3s units, slow down the capacity decay rate of the lipo battery 3s group, and prolong the service life of the lipo battery 3s group. For the series power lipo battery 3s group, its performance is determined by the worst-performing single lipo battery 3s in the lipo battery 3s group, so the balanced management of the lipo battery 3s is to ensure the power of each single lipo battery 3s during charging and discharging. It is basically equal to improve the overall performance of the power lipo battery 3s, that is, the single lipo battery 3s is charged in a balanced manner, so that each lipo battery 3s in the lipo battery 3s group reaches a balanced and consistent state. Balance technology is the key technology of a lipo battery 3s energy management system that is currently being researched and developed.

According to the balance criterion, the balance management system adopts the method of active balance or passive balance to balance the charge and discharge of the single lipo battery 3s with obvious differences in average voltage. Active balance adjustment can transfer the energy of lipo battery 3s with relatively sufficient power to lipo battery 3s with relatively low power, which can be achieved during charging and discharging; while passive balance generally adopts the method of parallel resistance to transfer excess lipo battery 3s energy Dissipated in the form of heat energy, when a section of lipo battery 3s needs to be balanced, a discharge path is provided for lipo battery 3s, which is usually used in the charging stage.
CNHL has also sorted out the charging and discharging of lipo battery 3s for everyone. For those who need it, please refer to:
Lipo battery 4s charging and discharging principle, be sure to store it well!

Energy management of 3 lipo battery 3s group

The energy management of the lipo battery 3s group includes charge control management and discharge control management.
Whether the setting of the charging management system is reasonable is related to the charging fullness and charging efficiency of the lipo battery 3s. It must be ensured that the battery is fully charged with a reasonable charging method and a suitable charging rate in the shortest possible time.
The main function of the discharge management system is to match the discharge rate of the pure electric vehicle under different working conditions and ensure the longest driving mileage as possible.

Pure electric vehicles often use multi-group energy management methods for charge and discharge management. The lipo battery 3s safety protection system realizes action by judging whether the voltage, current, temperature and other parameters of the lipo battery 3s exceed the preset thresholds during the charging and discharging process, and plays a protective role for the lipo battery 3s.
When it comes to the discharge of lipo battery 3s, CNHL has compiled the content of self-discharge of lipo battery 3s for everyone. Interested partners can check it out:
lipo battery 3s self-discharge dry goods!

lipo battery 3s thermal management system

During the charging and discharging process of the lipo battery 3s, in addition to the work of the energy management system, the thermal management system will also be activated. By heating or dissipating the heat of the lipo battery 3s group system, the working temperature of the lithium lipo battery 3s is adjusted, and the temperature environment is kept as low as possible. In the most suitable range of lithium lipo battery 3s, to maximize the ability of the lipo battery 3s group and delay the aging of the lipo battery 3s.

There are three main forms of thermal management system: air medium thermal management system, liquid medium thermal management system and phase change material thermal management system. The role of the thermal management system is to keep the lipo battery 3s in the optimal operating temperature range of 5 to 35 °C, and the maximum temperature difference of the lipo battery 3s group does not exceed 6 °C, which maximizes the service life of the lipo battery 3s group.
The following article explains in detail the effect of temperature on lipo battery 3s:
What are the current and temperature characteristics of 3s lipo battery xt90?

lipo battery 3s communication and data storage system

It is required that the BMS must have the function of communicating with the host computer, usually using serial communication. Vehicles often use the controller area network (Control Area Network, CAN) serial communication method. The CAN of the pure electric vehicle power lipo battery 3s management system consists of three parts: vehicle CAN, fast charging CAN and intranet CAN.
Vehicle CAN refers to the communication between the vehicle controller and the lipo battery 3s management unit; fast charging CAN refers to the communication between the charger management module and the lipo battery 3s management unit; intranet CAN refers to the lipo battery 3s management Communication between the unit and the Motor Control Management Module.

The parameters such as voltage, current and temperature of the power lipo battery 3s are stored in the program memory of the BMS main controller chip for easy call and search. At the same time, relevant programs are also set in the main controller to periodically clear historical data, which is convenient for storing parameters updated in real time.
The above is the whole content of the lipo battery 3s management system, I hope the above content will be helpful to you, here is more about the lipo battery 3s content, if necessary, please read it yourself:
Development and Structure of Lithium Batteries
6s 6200mah lipo management system and 6s 6200mah lipo SOC

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