Question

A EV battery has a capacity of 15kWh. assuming effective capacityused in the begining is 85% and end of life is 70% of capapcity. what range km will support at the end of life>

Answer 1

Let the number of currency 1 Won, 10 Won and 50 Won be x, y and z respectively.

x+10y+50z=107

Now the possible values of z could be 0, 1 and 2.

For z=0: x+10y=107

for above equation y can range from 0 - 10, taking total 11 values. that means above condition can satisfied by 11 ways.

For z=1: x+10y=57

for above equation y can range from 0 - 5, taking total 6 values. that means above condition can satisfied by 6 ways.

For z=2: x+10y=7

for above equation y can take only 1 value i.e 0. that means there is only 1 way to satisfy above condition.

Total no of ways = 11+6+1=18

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Answer 2

Answer:

The range will depend on battery efficiency (essential) Lets us assume it to be 80Wh/km (approx. efficiency for a EV sedan),

Range at beginning = (0.85*15000 Wh) / 80 Wh/km = 160kms

The 85% effective capacity used is known as Depth of Discharge of the battery. With aging this effective capacity gradually decreases to 70%. i.e., 70% of the 85%

Range at end of life = (0.7*0.85*15000 Wh) / 80 Wh/km = 111.56 kms

As it can be observed the range of the battery considerably drops and this is an indication that the battery's life is over and it has to be replaced.

Explanation: