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Design of Battery Management System and Research on Charging Equalization for EV

Author: SunHongTao
Tutor: XiaChaoYing
School: Tianjin University
Course: Control Theory and Control Engineering
Keywords: Electric vehicles Battery Management System CAN bus Equalizing charge
CLC: U463.6
Type: Master's thesis
Year: 2007
Downloads: 1412
Quote: 8
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Abstract


Electric vehicles as an alternative of the traditional fuel vehicles gradually become a hot topic . But the battery and battery management is a bottleneck restricting the development of electric vehicles , because of the limited driving energy can not meet the electric vehicle market , practical requirements . In the case of the battery capacity has been determined , the battery pack effectively monitoring, management, extend the life of the battery pack , an important means to enhance the driving range of electric vehicles . In this paper, the working characteristics of the lithium ion battery pack , designed a fully functional electric vehicle battery management system . System based on the functionality required , the use of distributed control structure, to achieve the monitoring and management of the monomer in the battery pack and the group . This paper first introduces the function and structure of the battery management system as a whole , and a detailed description of each module in the system hardware design . Secondly, the establishment of the battery management system internal CAN communication network , communication between nodes in the system , and designed a CAN application layer protocol , complete the system within the effective transmission of data and commands . In addition, according to the system hardware resources , the expansion of the independent CAN transceiver module battery management system with the vehicle CAN network communication . Single cells in series used in a group , the inconsistency between the battery will gradually deteriorate, thereby reducing the efficiency and service life of the battery pack . Equalizing charge as an effective way to reduce the inconsistency , can significantly extend the life of the battery pack . Equalizing charge program level description , and select the half-bridge inverter coaxial secondary winding transformer balanced charging scheme as the target program . In the Matlab environment , the simulation model of the battery , to build a balanced charge simulation circuit , and apply the circuit balanced charging process of the battery simulation model simulation inconsistency convergence predetermined equalization effect . Finally, based on the simulation results , the the equalizing charge program features and application further instructions .

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