Blogs

Introduction: The battery array management unit BAU uses the MYC-YA157C-V3 core board of Mill ARM architecture. The core board is based on the STM32MP157 processor and the Cortex-A7 architecture. It supports 1 Gigabit Ethernet, 2 CAN interfaces and 8 UART interfaces. Data communication function between equipment and battery cluster management unit (BCU), power storage converter (PCS) and energy management system (EMS).

The full name of BMS is Battery Management System, battery management system. It is a device that cooperates with monitoring the state of the energy storage battery. It is mainly for the intelligent management and maintenance of each battery unit, to prevent the battery from overcharging and overdischarging, to prolong the service life of the battery, and to monitor the state of the battery.

The battery energy storage system is composed of battery packs, energy storage converters (PCS), energy management systems (EMS), battery management systems (BMS) and other electrical equipment. The battery pack is responsible for power storage; the energy storage converter (PCS) controls the charging and discharging process of the battery pack, and performs AC-DC conversion; the energy management system (EMS) performs data collection, network monitoring and energy scheduling; the battery management system (BMS) is responsible for Monitor the operating status of each battery in the battery energy storage unit to ensure the safe operation of the energy storage unit.

BMS is one of the core subsystems of the battery energy storage system. It is responsible for monitoring the operating status of each battery in the battery energy storage unit to ensure the safe and reliable operation of the energy storage unit. The BMS can monitor and collect the state parameters of the energy storage battery in real time (including but not limited to the voltage of the single battery, the temperature of the battery pole, the current of the battery circuit, the terminal voltage of the battery pack, the insulation resistance of the battery system, etc.), and make necessary According to the analysis and calculation of the system, more system state evaluation parameters are obtained, and the effective control of the energy storage battery body is realized according to the specific protection control strategy, so as to ensure the safe and reliable operation of the entire battery energy storage unit. At the same time, BMS can exchange information with other external equipment (PCS, EMS, fire protection system, etc.) through its own communication interface, analog/digital input and input interface, and form the linkage control of various subsystems in the entire energy storage power station to ensure the safety and reliability of the power station , Efficient operation.

Figure: Battery energy storage system

Due to the large scale of battery packs, most energy storage BMSs have a three-layer structure. On top of the slave control and master control, there is another layer of master control.

• Slave control: BMU (battery module unit, also called CSC/CSU, etc.), which is responsible for collecting the information of the single battery such as voltage and temperature, calculating and analyzing the SOC and SOH of the battery, and realizing the active balance of the single battery , and upload the abnormal information of the monomer to the battery cluster management unit BCU through CAN communication;
• Main control: battery cluster management unit BCU (battery cluster unit, also has high-voltage management unit HVU, BCMU, etc.), responsible for collecting various battery information uploaded by BMU, collecting battery pack voltage, pack temperature, battery pack charge and discharge current, total Voltage information, leakage detection, and power-off protection when the state is abnormal; calculate and analyze the SOC and SOH of the battery pack, and upload all information to the battery array management unit BAU through CAN communication;
• General control: The battery array management unit BAU (battery array unit, also called BAMS, MBMS, etc.), centrally manages the batteries of the entire energy storage power station. Connect downward to each battery cluster management unit, collect various information uploaded by the battery cluster management unit; communicate upward with the energy management system, upload the collected battery information through Ethernet, and receive the battery operating parameters issued by the EMS system; through CAN or RS485 communicates with the converter PCS, and the BMS sends the battery status and abnormal information to the converter, and the energy storage converter PCS should take corresponding protection actions after receiving the BMS alarm information.

Figure: The battery energy storage system of the Mill STM32MP157 core board

The battery array management unit BAU adopts the MYC-YA157C-V3 core board of Mill ARM architecture. The core board is based on the STM32MP157 processor and the Cortex-A7 architecture. It supports 1 Gigabit Ethernet, 2 CAN interfaces and 8 UART interfaces to meet the needs of equipment Data communication function with battery cluster management unit (BCU), power storage converter (PCS) and energy management system (EMS). Large-capacity storage design supports long-term data storage of the system; it has rich interfaces, which can be connected to high-definition touch screens, Display various data information, and realize on-site monitoring and energy management; it has Gigabit Ethernet ports and data communication interfaces such as RS232 and RS485. It can easily respond to various functional requirements in various scenarios; it supports wifi module data communication, bringing faster response speed and IoT-based construction requirements.

Mill MYC-YA157C-V3 core board labeling diagram

Mill MYD-YA157C-V3 development board annotation diagram

Mill Electronics, focusing on the design and development of embedded processor modules, is a leading manufacturer of embedded processor modules. Mill Electronics has 20 years of industry technical experience in the embedded field, providing customers with professional ARM Industrial control boards, ARM development boards, ARM core boards, ARM development tools, charging pile billing control units and charging control boards and other products and technologies Serve. In addition, Mill Electronics can also provide customized design solutions through professional technologies covering many ARM processors and operating systems, and help customers accelerate the product launch process through professional and efficient services.