The Design Of LIFEPO₄Storage Battery Management System

Wind and solar energy and other new energy power generation is a hotspot in current researches, the new energy unlimited and pollution-free advantages make it become the development direction of future power generation technology. Battery energy storage is one key technology of new energy power generation technologies, and energy storage battery management system is the foundation and guarantee of battery energy storage application. Based on the real-time state parameters, energy storage battery management system effectively ensures the safety of the battery, high efficiency and longevity.This paper selects large capacious LiFePO4battery as energy storage battery. Completed characteristics test of the battery, and draw the relevant characteristic curve. Based on the investigation of existing battery management systems at home and abroad and combined with the characteristics of the storage battery, designing a set of battery management system used freescale MC9S12single chip microcomputer and PC104. A subsystem manages4-192batteries, the communication of system uses CAN bus and RS232. System design follows the existing standards, realizing the standardization of system, improving the scalability of the system.Microcontroller hardware design uses the modular design method, including the design of serial communication, CAN communication design, SPI communication design and digital to analog conversion module design, improving the flexibility and stability of the system. The paper compared and analysised the acquisition scheme of battery voltage, temperature and current, selected the optimal acquisition scheme, and introduced the hardware structure of PC104.Software design also follows the modular and hierarchical design method. MCU software design mainly completes the acquisition of battery voltage, current and temperature, CAN communication and serial port communication, SOC estimation module subroutine design. PC monitoring software uses MFC development interface, realizeing data transmission, data display, receiving alarm, handling alarm, recording and inquiring parameters, etc. On the basis of PC software design completed monitoring software design of the man-machine interface and PC104.Finally, the paper introduces the system actual verification and debugging. Verified the feasibility of the design, and gave all equipment physical pictures. According to the consistency test and battery group technology, the paper selected and connected the battery, completed the system hardware connection and software debugging, and solved the problems in debugs.