Effects of Cell and Module Configuration on Battery System in Electric Vehicles

Öz

Battery pack is one of the most important powertrain components in Electric Vehicles (EV). The performance of battery pack directly affects vehicle’s range and performance. Configuration of cells and modules inside battery pack also plays an important role on battery performance and safety. In this study, the work deals with an electric vehicle that has 400 V DC bus voltage and 78 kWh total energy content. When the vehicle’s battery is designed, the criteria to be focused on are evaluated for three different configurations of given cell quantity. Thus, optimum design solution can be achieved. According to calculations, cost analysis, total electrical power loss and most efficient solution scenarios (alternatives) are determined for these three different configurations afterwards system complexity is optimized. In the first configuration, 8 series modules are selected which have 12s6p cell configuration. In the second configuration, there are 16 modules with 8s2p module combination. Each module is equipped with 12s3p cell configuration. Last configuration has 16 modules in series where each module has 6s6p cell configuration. Advantages and disadvantages of the systems are revealed as a result of the calculations made for each configuration.

Anahtar Kelimeler

• Battery electric vehicle,battery pack,battery module,battery cell

Kaynakça

1. Kennedy B, Patterson D and Camilleri S, 2000, Use of lithium-ion batteries in electric vehicles, Journal of Power Sources, 90 156-162.
2. Shiau C S N, Samaras C, Hauffe R and Michalek J J, 2009, Impact of battery waight and charging patterns on the economic and environmental benefits of plug-in hybrid vehicles, Energy Policy, 37 2653-2663.
3. Smith K, Wang C Y, 2006, Power and thermal characterization of a lithium-ion battery pack for hybrid-electric vehicles, Journal of Power Sources, 160 662-673.
4. Kiziel R, Sabbah R, Selman J R, Al-Hallaj S, 2009, An alternative cooling system to enhance the safety of Li-ion battery packs, Journal of Power Sources, 194 1105-1112.
5. Zubi G, Lopez R D, Carvalho M, Pasaoglu G, “The lithium-ion battery: State of the art and futureperspectives”, Renewable and Sustainable Energy Reviews, vol. 89, pp. 292-308, 2018.
6. Danzer, M.A., Liebau V., Maglia F., “Aging of lithiumion batteries for electric vehicles”, Energy, pp. 359-387, 2015.
7. ISO Standard 6469-3, Electrically propelled road vehicles -- Safety specifications -- Part 3: Protection of persons against electric shock, International Organization for Standardization, 2011.
8. Kim J, Shin J, Chun C, Cho B H, “Stable configuration of a li-Ion series battery pack based on a screening process for improved voltage/SOC balancing”, IEEE Transactions on Power Electronics, vol. 27, pp. 411-424, 2012.

9. Kim C H, Kim M Y, Moon G W, “A modularized charge equalizer using a battery monitoring IC for seriesconnected li-Ion battery strings in electric vehicles”, IEEE Transactions on Power Electronics, vol. 28, pp. 3779-3787, 2013.
10. https://www.highspeedtraining.co.uk/hub/manualhandling-weight-limits/, 17.09.2018.
11. Brand M J, Schmidt P A, Zaeh M F, Jossen A, “Welding techniques for battery cells and resulting electrical contact resistances”, Journal of Energy Storage, vol. 1, pp. 7-14, 2015.
12. IEC Standard 60664-1, Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests, International Electrotechnical Commission, 2007.
13. SAE Standard 2013-01-1528, Application of Insulation Standards to High Voltage Automotive Applications, Society of Automotive Engineers, 2013.