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Battery Management System, Balancing Modularization based on Single Switched Capacitor and Bi-directional DC/DC Converter with the Auxiliary Battery
Tijdschriftbijdrage - Tijdschriftartikel
Lithium based batteries are considered as most advanced batteries technology, which can be designed for high energy or high power storage systems [1]. However, the battery cells are never fully identical due to the fabrication process, surrounding environment factors and differences between the cells tend to grow if no measures are taken. In order to have a high performance battery system, the battery cells should be continuously balanced for keeping the variation between the cells as small as possible. Without an appropriate balancing system, the individual cell voltages will differ over time and battery system capacity will decrease quickly. These issues will limit the electric range of the electrical vehicle (EV) and some cells will undergo higher stress, whereby the cycle life of these cells will be shorter [2].
Quite a lot of cell balancing/equalization topologies have been previously proposed. These balancing topologies can be categorized into passive and active balancing. Active topologies are categorized according to the active element used for storing the energy such as capacitor and/or inductive component as well as controlling switches or converters.
This paper proposes an intelligent battery management system (BMS) includes:
1st The battery pack charging and discharging control. 2nd The battery pack thermal management system. 3rd The BMS user input/output interfacing. 4th An innovative battery balancing system based on battery pack modularization. The proposed modularized balancing system has different equalization systems that operate inside and outside the modules. Innovative single switched capacitor (SSC) control strategy is proposed to balance between the battery cells in the module (inside module balancing, IMB) [3]. Novel utilization of isolated bidirectional dc/dc converter (IBC) is proposed to balance between the modules with the aid of the EV auxiliary battery (AB). 5th Experimental step-up is implemented for the validation of the proposed balancing system. The battery pack consists of 12 Li-Ion series cells divided into three modules with four cells each.
Quite a lot of cell balancing/equalization topologies have been previously proposed. These balancing topologies can be categorized into passive and active balancing. Active topologies are categorized according to the active element used for storing the energy such as capacitor and/or inductive component as well as controlling switches or converters.
This paper proposes an intelligent battery management system (BMS) includes:
1st The battery pack charging and discharging control. 2nd The battery pack thermal management system. 3rd The BMS user input/output interfacing. 4th An innovative battery balancing system based on battery pack modularization. The proposed modularized balancing system has different equalization systems that operate inside and outside the modules. Innovative single switched capacitor (SSC) control strategy is proposed to balance between the battery cells in the module (inside module balancing, IMB) [3]. Novel utilization of isolated bidirectional dc/dc converter (IBC) is proposed to balance between the modules with the aid of the EV auxiliary battery (AB). 5th Experimental step-up is implemented for the validation of the proposed balancing system. The battery pack consists of 12 Li-Ion series cells divided into three modules with four cells each.
Tijdschrift: Energies
ISSN: 1996-1073
Volume: 7
Pagina's: 2897-2937
Jaar van publicatie:2013
Trefwoorden:Battery management system, Battery balancing, Cell equalization, MATLAB/Simulink, Isolated bidirectional converter, Single switched capacitor, SSC, BMS