A Novel Battery Management System Architecture Based on an Isolated Power/Data Multiplexing Transmission Bus

Abstract

Hardware structure is a basic characteristic of a battery management system (BMS), which influences overall performance of battery packs. This paper presents a novel BMS architecture based on the power/data time division multiplexing transmission (PD-TDMT) technique. In the proposed system, a common bus is employed to transfer power and data simultaneously, so the system wiring is simplified. The system consists of a pack management unit (PMU) and several cell management units (CMUs). The circuit of the CMU is compact and achieves conventional management functions like status monitoring and active cell balancing, thus it can be integrated with battery cell to be an intelligent cell. The timing sequence of the system is presented, and the design considerations are discussed in detail, including terminal resistance selection and maximum node number calculation. At last, a simulation based on MATLAB is carried out and an experimental prototype system with 6 nodes is built, which verify the correctness of the architecture and prove the feasibility in practical applications.