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University of Windsor *

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06-88-590-

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Electrical Engineering

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Dec 6, 2023

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27/12/2022, 00:42 Review Test Submission: Quiz_07 — ELEC8900-30-R-2022F ... According to the Combined model of a Li-ion battery: Vo(s) = ko + K151 + Kas + Kz In(s) + keIn(1 — 5) (3) the OCV parameters is ko = 3.86, ky = 1.05¢ —4, ky = 6.24e—3, k3 = 0.1066, ky = —69.4¢—3. The parameters were obtained after linearly scaling with € = 0.175. The scaled SOC is s=(1-2¢)s+e. In charging process (see Figure 2), the measured terminal voltage v(k) = 4V, the current i(k) = 5A, and the internal resistance of the battery is Ry = 0.04€). What is the SOC of the battery at time k7 (reference the OCV-SOC plot to get the answer). Figure 2: Equivalent Circuit Model of a battery Selected Answer: around 42% Answers: around 50% & around 34% around 42% around 40% Question 2 4 out of 4 points A battery with a 20 Ah capacity is discharged at C/30 rate. What is the discharge current and how long will it take to fully discharge the battery? (Assume an ideal battery) Selected Answer: ¢ 1A, 30 hours Answers: & 0.1A, 30 hours 1A, 30 hours 1.5A, 15 hours 0.333A, 45 hours Question 3 4 out of 4 points https://blackboard.uwindsor.ca/webapps/assessment/review/review.jsp?attempt_id=_10210075_1&course_id=_165126_1&content_id=_2142089_1&o... 2/4

27/12/2022, 00:42 Review Test Submission: Quiz_07 — ELEC8900-30-R-2022F ... When considering connecting battery cells in parallel, what is correct about the voltage and capacity of the resulting module? Selected Answer: & Voltage stays the same, capacity increases Answers: Voltage increases, capacity decreases Voltage decrease, capacity increases Voltage increases, capacity stays the same ¢, Voltage stays the same, capacity increases Question 4 4 out of 4 points Figure 1: Equivalent circuit model of a battery. The open circuit voltage of the battery has the following model: Va(s) =ko + kys™" + kos ™2 + kas > + kys™ + kss + ke In(s) + k7In(1 — s) (1) where k0 = —9.0818, k1 = 103.0870, k2 = —18.1846, k3 = 2.0625, k4 = —0.1018, k5 = —76.6037, k6 = 141.1994, and k7 = —1.1168, These parameters were computed for SOC values s € [0, 1] after they were linearly scaled to s’ € [.175,.825]. The internal resistance of the battery is Ry = 0.2Q. The SOC of the battery is 50%, i.e., s = 0.5. Compute v(k) when the current through the battery is i(k) = 0 A. Selected Answer: @, 3.825V Answers: 4.016V & 3.825V 3.752V 3.672V Question 5 4 out of 4 points https://blackboard.uwindsor.ca/webapps/assessment/review/review.jsp?attempt_id=_10210075_1&course_id=_165126_1&content_id=_2142089_1&o... 3/4

27/12/2022, 00:42 Review Test Submission: Quiz_07 — ELEC8900-30-R-2022F ... Ro —i(k) — A + V;(s)+—__—' v(k) 0 Figure 1: Equivalent circuit model of a battery. The open circuit voltage of the battery has the following model: Vo(s) =ko + kys™' + kos ™2 + kas > + kas™ + kss + ke In(s) + k7In(1 — s) (1) where k0 = —9.0818, k1 = 103.0870, k2 = —18.1846, k3 = 2.0625, k4 = —0.1018, k5 = —76.6037, k6 = 141.1994, and k7 = —1.1168, These parameters were computed for SOC values s € [0, 1] after they were linearly scaled to s’ € [.175,.825]. The internal resistance of the battery is Ry = 0.2Q. The SOC of the battery is 50%, i.e., s = 0.5. What is the terminal voltage when the battery is discharged with constant 200 mA current? Selected Answer: @ 3.785V Answers: & 3.785V 3.976V 3.645V 3.890V Tuesday, December 27, 2022 12:42:05 AM EST «— OK https://blackboard.uwindsor.ca/webapps/assessment/review/review.jsp?attempt_id=_10210075_1&course_id=_165126_1&content_id=_ 2142089 1&o... 4/4

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