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Here is a circuit in which a supercapacitor is in parallel with the battery to manage the high pulse current requirement without stressing the battery. What is the use of boost converters here?

One more doubt-->

Are these boost converters are required if i am using 3.6v battery and I only need a 3.4v-3.6v Vout? I am using 5.5V, 4.7F cap.

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    \$\begingroup\$ 1) to generate 4.1V. 2) Not necessarily. Calculate the Q you get from discharging from 3.6 to 3.4V and compare that with your requirement. \$\endgroup\$
    – user16324
    Sep 17, 2019 at 7:54

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It's the only way to get 4.1V from a 3.5V supply, it also handles the voltage droop shown as "Vin"

if your voltage needs are less critical you may not need the boost regulator.

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