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Introduction to battery-management systems- COURSERA WEEK 04 FINAL QUIZ

 Introduction to battery-management systems- COURSERA WEEK 04  FINAL QUIZ 1 . Question 1 W hich of the followi ng detection mechanisms could protect a battery pack from overcurre nt? Select all that apply. 1 point Contactor Thermal fuse Electronic protection Resettable fuse 2 . Question 2 Suppose that a small passenger vehicle expends energy at a rate of 220Wh/mile while driving. If this vehicle's battery pack is charged at a 6.6kW rate, what is the rate of range added to the battery in "miles (of range) per hour"? Round your answer to the nearest "mph". 1 point 3 . Question 3 Suppose that a positive-electrode material has \theta_{0\%}^{\rm pos}=0.99 θ 0 % p o s ​ = 0 . 9 9 and \theta_{100\%}^{\rm pos}=0.49 θ 1 0 0 % p o s ​ = 0 . 4 9 . If \theta_k^{\rm pos}=0.59 θ k p o s ​ = 0 . 5 9 , what is the present cell state-of-charge (in percent)? Round to the nearest percent. 1 point 4 . Question 4 Suppose that a lithium-ion cell having total charge capacity Q=10 Q =...
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Introduction to battery-management systems- COURSERA WEEK 03 QUIZ -1.3.6 ANSWERS

 Introduction to battery-management systems- COURSERA WEEK 03 QUIZ -1.3.6 ANSWERS

Practice quiz for lesson 1.3.6

Question 1

Which of the following statements are true about contactors and their use in BMS? Select all that apply.

1 / 1 point
Correct

Yes. If a battery pack were instantly connected to a capacitive load, then enormous current would flow at the instant of connection, possibly welding the terminals of the contactors together, causing permanent damage. The precharge contactor limits initial current to a safe level.

Correct

Yes. This is the main purpose of a contactor, in general.

Correct

Yes, although this is a variable factor. One is often used for the negative terminal, one for the positive terminal, and one for the precharge circuit. Some battery-pack designs omit either the negative- or positive-terminal contactors (leaving one side of the battery stack permanently connected to the load), and some omit the precharge circuit (if the load is not capacitive to the extent that damage would be caused without the precharge circuit).

Question 2

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

1 / 1 point
Correct

Yes. This is the correct sequence.

Question 3

When connecting a battery pack to a load, when should the precharge circuit be deactivated? Select all that apply.

1 / 1 point
Correct

Yes. This indicates that the capacitive load is sufficiently charged to close the main contactor.

Correct

Yes. This indicates that the capacitive load is sufficiently charged to close the main contactor.

Correct

Yes. But notice that this indicates a short-circuit fault in the load, and while the precharge circuit should be deactivated, the entire battery pack should also be disconnected from the load.

Correct

Yes. But, in general, this does not guarantee that the capacitive load has been charged to a safe level, especially if the load circuit has failed in some way (e.g., it is a short circuit). So, if the pack and bus voltages are not similar enough after this period of time, the entire battery pack should be disconnected from the load; otherwise, the battery pack can be connected to the load.

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