BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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112 Vlad Marţian et al Current Intensity [A] 80 70 4.5 4 60 3.5 50 3 2.5 40 2 30 1.5 20 1 10 0.5 0 0 0 10 20 30 40 50 60 70 Time [min] Battery Voltage [V] Current Intensity Battery Voltage Fig. 8 – Current intensity and voltage. Eoc [V] 4 3.5 3 2.5 2 1.5 1 0.5 0 0 0 0.2 0.4 0.6 0.8 1 1.2 0.09 0.08 0.07 0.06 0.05 0.04 Rint [Ω] 0.03 0.02 0.01 SOC Open circuit voltage Internal Resistance Fig. 9 – Battery internal parameters. Chart in Fig. 8 show the current intensity and voltage evolution in time and Fig. 9 show the battery parameters, Open Voltage E oc and internal resistance R int function of the battery state SOC. Another simulation done was with a simple cooling of the battery, and with a variable load resistor which changes the current drawn over time. Here we used a convection model to remove the heat from the battery and an ambient temperature of 20 o C. In Fig. 12 can be seen that the temperature and the current intensity are connected but there is a slight shift between the current maximum and the temperature maximum, this can be explained if we look at Fig. 11 and Fig. 9. In Fig. 11 can be observed that the maximum temperature is near a SOC of 0 and from Fig. 9ig. 9 we can see that at SOC near 0 the internal resistance rises so more heat will be generated.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 3, 2012 113 Fig. 10 – Second simulation. Temperature [ o C] 30 25 20 15 10 5 1.2 1 0.8 0.6 0.4 0.2 SOC 0 0 0 10 20 30 40 50 60 Time [min] Temperature SOC Fig. 11 – Temperature and SOC. 30 120 Temperature [ o C] 25 20 15 10 100 80 60 40 Current intensity [A] 5 20 0 0 10 20 30 40 50 60 Time [min] Temperature Fig. 12 – Temperature and current intensity. 0 Intensity
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BULETINUL INSTITUTULUI POLITEHNIC D
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