Design And Implementation Of Electric Yachts Battery Line Monitoring System

Except for car, yacht is another high-end entertainment and consumer product. Yacht, as an entertainment tool, is currently very popular in Europe and other developed countries. With China’s rapid economic development, the demand for high-end entertainment consumption is increasing. In the near future, China will catch up with the pace of developed countries and the yacht industry will also become not only an import part of the tourism industry, but also one of the components of personal consumer goods. The promotion of battery management system, which is one of the three elements of the electric device, will play a decisive role in the development of electric yachts. The main function of the battery management system includes the remaining capacity of the battery estimation, charge and discharge management, cell balancing, unexpected treats and so on. In this paper, lead-acid battery as the research object, use the improved battery model combines Kalman filter algorithm to estimate the SOC, and use a distributed architecture and the CAN communication to make each module work together.Firstly, this paper introduces the research background, power battery survey, present situation of the development of the battery management system and the future. Then analyze the internal structure and electrochemical reaction mechanism of lead-acid battery, discuss battery charge and discharge characteristics, construct and improve the battery model which is fitted for this system. With learning commonly used battery SOC estimation method, this paper proposed an extended Kalman filter SOC estimation method based on approximation of complex multi-stage battery model. Combined with other commonly used battery SOC estimation method, the accuracy of the SOC estimation in this system is improved. According the distributed features of present system, select the CAN bus as a means of communication. In order to improve the communication reliability and flexibility between modules, this paper proposes online monitoring mechanism, model ID pairing mechanism and retransmission buffer mechanism.Secondly, this paper introduces the finished battery management system in hardware and software perspective. This system includes rechargeable module, cell balancing and voltage temperature acquisition module, current detection module and display-control module which are together to complete the function of charge and discharge management, cell balance control, voltage temperature acquisition, current detect, battery SOC estimation, unexpected prevention treats. All of this feature implement the function of battery management system.Lastly, this paper tested the battery management system in the battery SOC estimation, the CAN communication and the battery charging balancing perspective. After analyzing the results, this paper show that the battery management system completes the basic completion of expectations, has a high battery SOC estimation accuracy, and meets the requirements of practical application.