The rapid development of UAV technology, especially in commercial and industrial application fields, the emergence of 100kg large UAV has brought new opportunities for logistics, agriculture, mapping and other industries. In order to ensure the safe and efficient operation of large unmanned aerial vehicles, lithium battery management system (BMS) is particularly important. This article will discuss in detail a lithium battery management system scheme suitable for 100kg large unmanned aerial vehicles.

I. Basic concepts of lithium battery management system

lithium battery management system (BMS) is an electronic system used to monitor and manage lithium battery pack. Its main functions include battery status monitoring, charge and discharge control, balanced charging, fault diagnosis and protection, etc. For large unmanned aerial vehicles, BMS should not only ensure the safety of the battery, but also improve its use efficiency and prolong the battery life.

II. System composition

A complete lithium battery management system usually consists of the following parts:

1. Hardware part

• battery cell: Select the high-energy density lithium battery unit that meets the needs of unmanned aerial vehicles, usually using 18650 or 21700 models to ensure the stability and safety of the battery pack under high load.
• Battery Management chip: Select a battery management chip with multi-channel monitoring capability to monitor the voltage, temperature and status of each battery cell in real time.
• sensor: Configure voltage sensor, temperature sensor and current sensor to comprehensively monitor the battery pack.
• Communication module: integrates RS-485 such as CAN, communication module, or WIFI to facilitate data interaction with the main control system of the UAV.

2. Software part

• monitoring Software: Develop a user-friendly monitoring software interface to display the voltage, current, temperature, remaining power and other information of the battery in real time.
• Data processing algorithm: design efficient data processing algorithms to calculate the SOC (State charge), SOH (state of health) and SOP (state protection) of the battery in real time, and realize dynamic adjustment.

III. Key functions

1. Battery status monitoring

BMS needs to monitor various parameters of the battery pack in real time, including voltage, current, temperature, internal resistance, etc. Through the monitoring of these parameters, potential faults can be found in time to ensure the safe use of the battery.

2. Charge and discharge management

BMS needs to intelligently control the charging and discharging process to ensure that the battery runs within a safe working range. When charging, use constantConstant voltage charging strategy to avoid overcharging; When discharging, monitor the battery power in real time to avoid overdischarging and ensure the service life of the battery.

3. Balanced charging

due to the characteristics of lithium batteries, the voltage of individual batteries in the battery pack may vary. The BMS needs to be evenly charged regularly to ensure that the voltage of each battery cell is consistent and prevent overcharging or overdischarging of some battery cells, thus prolonging the service life of the battery pack.

4. Fault diagnosis and protection

BMS should have fault diagnosis and protection functions. When the system detects abnormal situations (such as overvoltage, overcurrent, overtemperature, etc.), it can automatically cut off the power supply or send an alarm, protect the safety of batteries and unmanned aerial vehicles.

5. Data recording and analysis

BMS can record the usage data of the battery regularly, including the number of charge and discharge cycles, temperature changes, usage time, etc. These data are of great significance for subsequent battery performance analysis and maintenance management.

IV. System architecture design

1. Hardware architecture

the hardware architecture should adopt modular design to facilitate maintenance and upgrade. Battery unit, monitoring module and communication module can be replaced independently to reduceMaintenance costs.

2. Software architecture

the software part should be designed in a hierarchical architecture. The underlying layer is responsible for data collection and processing, and the upper layer is responsible for user interface and data display. This design can improve the flexibility and scalability of the system.

V. Application cases

taking a 100kg large UAV as an example, its lithium battery management system adopts the above scheme. When carrying out cargo transportation tasks, the UAV monitors the battery status in real time through BMS to ensure safe and stable flight under various environmental conditions. After a long period of practical application, the battery life of the UAV has been effectively prolonged and the failure rate has been significantly reduced.

Lithium battery management system is very important in the application of 100kg large unmanned aerial vehicle. Through effective monitoring, management and protection functions, BMS can ensure the safety and efficiency of the battery and prolong the service life of the battery. The lithium battery management system scheme introduced in this paper aims to provide reference for the design and application of large unmanned aerial vehicles and help the healthy development of unmanned aerial vehicle industry.