Introduction to battery-management systems- COURSERA WEEK 03 FINAL QUIZ

 Introduction to battery-management systems- COURSERA WEEK 03  FINAL QUIZ

1.

Question 1

What is the power capability (in kW) of a 1P50S battery pack built from lithium-ion cells each having nominal capacity of 10Ah, nominal voltage of 3.8V, and present current-carrying capability of 100A?

1 point

2.

Question 2

In a 8P100S battery pack built using parallel-cell modules (PCMs), how many cells are there in each module?

1 point

3.

Question 3

In a master/slave BMS design, which of the following are usually functions performed by the master? Select all that apply.

1 point

Control the contactors that connect the battery to the load

Communicate with the BMS slaves

Control the battery-pack thermal-management system

Monitor battery-pack electrical current and isolation (ground-fault detection)

Communicate with host-application controller

4.

Question 4

If an analog-to-digital converter has an input range of 0V through 5V, and has 12 bits of precision, what is the resolution of the converter (in mV)? Round your answer to the nearest mV.

1 point

5.

Question 5

If an analog-to-digital converter has an input range of 0V through 5V, has 10 bits of precision, what is the maximum quantization error possible for the converter (in mV)? Round your answer to the nearest mV.

1 point

6.

Question 6

Consider the voltage-divider circuit:

What is the voltage $v$ (in V)?

1 point

7.

Question 7

Consider an NTC thermistor having $R_0 = 100$k$\Omega$, $T_0 = 25^\circ$C, and $\beta=4282$ connected in a voltage divider circuit with $R_1=100$k$\Omega$ and $v=5$V. If we measure $v_{therm}=2$V, what is the temperature of the thermistor (in $^\circ$C)? Round your answer to the nearest $^\circ$C.

Remember that the thermistor equation is: $R_{therm} = R_0 \exp\left(\beta\left(\frac{1}{273.15+T} - \frac{1}{273.15+T_0}\right)\right)$.

1 point

8.

Question 8

Consider a 0.1m$\Omega$ current-sensor shunt, connected via an amplifier with gain factor of 200 to an analog-to-digital converter. If the measured voltage is 4V, what amount of electrical current is passing through the shunt (in A)? Round your answer to the nearest A.

1 point

9.

Question 9

What is the primary advantage to using a current-sensor shunt instead of a Hall-effect sensor?

1 point

Shunt measurements are not affected by temperature, and so it is simple to use shunts for battery systems that must operate over wide temperature ranges

The shunt-sensor voltage can be measured directly by the battery-management system without specially designed circuitry

Current-shunt sensors are electrically isolated from the battery pack, so no special isolation circuitry is needed

Shunts have no measurement offset at zero current, so are good to avoid drift in coulomb counting

10.

Question 10

When connecting a battery pack to its load, which of the following sequences is listed in the correct order?

1 point

1. Connect one battery terminal to the load

2. Connect the second battery terminal to the load

3. Connect the other battery terminal to the load through the precharge circuit

4. Disconnect the precharge circuit

1. Connect one battery terminal to the load through the precharge circuit

2. Connect the same battery terminal to the load

3. Disconnect the precharge circuit

4. Connect the second battery terminal to the load

1. Connect one battery terminal to the load

2. Connect the other battery terminal to the load through the precharge circuit

3. Connect the second battery terminal to the load

4. Disconnect the precharge circuit

1. Connect one battery terminal to the load

2. Connect the same battery terminal to the load through the precharge circuit

3. Connect the second battery terminal to the load

4. Disconnect the precharge circuit

11.

Question 11

Consider a battery having $V_b=350$V. What is the minimum value of isolation resistance (in k$\Omega$) for the battery pack to be considered safe (per the standard discussed in lesson 1.3.7)?

1 point

12.

Question 12

Consider a battery having $V_b=300$V. We measure $V_1=160$V and $V_2=140$V. If we insert a known resistance $R_0=150$k$\Omega$ on the negative-terminal side of the battery, then we measure $V_1'=80$V. If, instead, we insert a known resistance $R_0=150$k$\Omega$ on the positive-terminal side of the battery, then we measure $V_2'=70$V.

What is the isolation resistance of this battery pack (in $\Omega$)? Round your answer to the nearest $\Omega$.

1 point