Introduction to battery-management systems- COURSERA WEEK 04 QUIZ -1.4.2 ANSWERS

 Introduction to battery-management systems- COURSERA WEEK 04 QUIZ -1.4.2 ANSWERS

Practice quiz for lesson 1.4.2

Total points 3

1.

Question 1

For which of the following communication needs do you think that the high-speed CAN protocol must be used to communicate between the BMS and the host application instead of the low-speed protocol?

1 / 1 point

For reporting detection of an emergency condition (e.g., a short-circuit fault in one of the cells) that requires the BMS to disconnect the battery pack from the load

For reporting battery cell state of charge information to the host application

For reporting battery cell state of health information to the host application

For reporting vehicle range estimates to the host application

Correct

Yes. The high-speed mode should be used for extremely time-critical tasks, such as reporting the need to shut down the battery pack in the case of an emergency.

2.

Question 2

Suppose that an electric sport-utility passenger vehicle expends energy at a rate of 220Wh/km 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 "km (of range added to battery charge) per hour"? Round your answer to the nearest "km/h"

1 / 1 point

30

Correct

Yes. You can solve this problem via unit analysis and note that (W)/(Wh/km) = (km/h). This type of analysis is quite a convenient way to think about how long a battery pack must be charged in order for the vehicle to travel a desired distance.

3.

Question 3

Which of the following data would probably not be stored in the "log book" permanent memory of the BMS?

1 / 1 point

An exhaustive record of computed available power versus time for the battery pack

Out of tolerance voltage, current, and/or temperature

Number of discharge/charge cycles completed

Battery pack state-of-health when the BMS was last shut down or powered up

Correct

Yes. The log's storage capacity is limited, so long data sets such as a profile of available power versus time are not stored.