Deck 19: Battery Electric Vehicles Bevs

Question 1

A solar photovoltaic installation generates an average of 20 MW of power
during a 12-hour period of sunlight and no power during 12 hours of night. A Pb-acid
battery system is designed to store one day of solar energy for use at night, and during
periods of less than full sunlight. What is the mass of the battery system?

Answer 1

Question 2

A family vehicle uses 100 kg of Li-ion batteries in conjunction with 200 kg
of supercapacitors for energy storage. What is the maximum power output, and what is its
range? Would it be advantageous to increase or decrease the relative mass of the batteries
compared to the supercapacitors in order to improve vehicle characteristics?

Answer 2

Using information from Table 19.2 for Li-ion batteries and from Figure 19.1 for

Question 3

A typical Pb-acid automobile battery weighs 20 kg. Compare the amount of

Answer 3

From Table 19.2, the specific energy for Pb-acid batteries is 0.13 MJ/kg. Thus a

Question 4

What are the ranges of typical (family size) battery electric vehicles that
utilize 250 kg of batteries if the batteries are (a) Pb-acid, (b) NiMH, and (c) Li-ion?

Question 5

If the number of electric vehicles in the United States continues to increase

Question 6

An owner of an electric vehicle with a range of 200 km plans to drive the

Question 7

(a) If primary alkaline D cells are used to power an electric (family-size)

Question 8

Estimate the mass of a disk-shaped steel flywheel that would be required to

Question 9

(a) Consider a Pb-acid battery backup system for a residence. Using

Question 10

What is the range of a family-sized vehicle utilizing 100 kg of
supercapacitors as an energy storage mechanism? What is the maximum power output (in
watts)?

Question 11

Describe the trends in specific energy as a function of battery size for Zn-C
and alkaline cells. Show that the values given for large batteries in the text are reasonable.

Question 12

Estimate the mass of supercapacitors necessary to provide a vehicle with
the same range as an internal combustion gasoline engine vehicle with a 70 L fuel tank.

Question 13

Assume that the batteries in an electric vehicle are designed to provide the

Question 14

For the vehicle considered in Example 19.5, estimate the available power.

Question 15

Supercapacitors benefit from large effective surface areas and small

Question 16

A gasoline-powered automobile burns 7.0 L of fuel per 100 km while

Question 17

The Tesla Model S (performance version) has a total battery capacity of 85

Question 18

(a) Using the specified maximum output power for the NiMH battery-

Question 19

An electric vehicle owner drives 25,000 km per year and uses electricity