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BMW i3 storage system layout and components [3]

BMW i3 storage system layout and components [3]

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Figure 1: Overview of BMW i3 Storage System [3]
Figure 2: BMW i3 module layout and components [3]
Figure 3: BMW i3 storage system layout and components [3]
Figure 6: a) Basic outline of system controlled by CAN protocol and b)...
+23 Figure 7: Flow-­-chart of required project steps
MSc Thesis: Evaluation and Refinement of Measurement Procedures for High-Voltage Energy Storage Systems of Production Electric Vehicles
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  • Sep 2011
This thesis summarises and evaluates the research work done as part of an industrial Master’s project for the School of Engineering Sciences, University of Southampton, United Kingdom in co-operation with the Bayerische Motoren Werke (BMW) Centre of Competence in Electric Mobility Department in Munich, Germany. The focus of the work was to analyse...
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Context 1
... shown in Figure 3, the modules are electrically connected through the electrical and control system. There is one system management unit (SME, alternatively called battery management system or BMS). ...
Context 2
... overview of the results is shown in Figure 29, while Figure 30 shows the pause duration in more detail and also includes the curve for a test with no pause current. ...
Context 3
... shown in Figure 33, the difference between the two system voltages remained almost stable during the test. Before the onset of the discharge pulse, the voltage difference was 4.0V, which rose to 4.8V immediately after the pulse (see Table VII). ...
Context 4
... allow comparisons between the modules without great influence of the tendencies of individual cells, the average cell voltage for each of the modules within the pre-stressed ESS was calculated and compared. Figure 30). The slightly thicker red and black curves represent modules 6 and 7, respectively. ...
Context 5
... shown in Figure 34 this comparison yielded clear differences between the modules. In terms of internal resistance at the onset of the discharge pulse, the prestressed module with module number 7 was in fact found to have the best performance along with module number 3. The worst module by a margin of 30µΩ, i.e. around 5% of the average cell internal resistance, was module number 6. ...
Context 6
... analyse the results, the first step included looking at the changes in system voltage at the onset and offset of current pulses and to see whether MMCs had a significant influence on the system resistance. As shown in Figure 35, two systems with and two systems without MMCs, all starting at 50% SOC, were compared. While some notable differences in the internal resistance were found the presence of the MMCs did not substantially stand out (see Table X). ...
Context 7
... considered (colour in Fig. 35 ...
Context 8
... in fact, it is here that a small but meaningful difference can be noticed. Throughout the pulse both curves for the systems with MMCs, i.e. the red and green curves, are found to have a negative V MC that is slightly higher than for the systems without MMCs, i.e. the blue and yellow curves (see Figure 37). ...
Context 9
... comparison was therefore done between the systems with and without MMCs at SOC levels of 10% and 70%. As shown in Figure 38 and Figure 39, both the 10% and the 70% comparisons qualitatively showed quite similar results to the previous test at 50%. The average value across the steady region from approximately 6s after the pulse onset until around 5s before the offset, i.e. just before the SME started limiting the voltage was, again calculated. ...
Context 10
... comparison was therefore done between the systems with and without MMCs at SOC levels of 10% and 70%. As shown in Figure 38 and Figure 39, both the 10% and the 70% comparisons qualitatively showed quite similar results to the previous test at 50%. The average value across the steady region from approximately 6s after the pulse onset until around 5s before the offset, i.e. just before the SME started limiting the voltage was, again calculated. ...