Question

A lithium ion battery bank is being charged over a period of two hours, during which it consumes 10kWh of electrical energy. Duringthis time, its temperature increases from ambient (25 °C) to 50 °C andis retained at 50 °C until the end of the charging process. Also, the battery loses Otosa = 3 MJ of heatduring this charging process. If the mass of the battery is m= 100 kg, and the battery could be considereda solid for sensible energy purposes with a heat capacity c = 3,000 J/kg-K. While answering thequestions below, carefully indicate the system under consideration and write the first law for thissystem.The change in sensible energy of an incompressible solid can be computed from AU sensible = mc 47(5 marks) What is the total change in internal energy Au, and what is the change in internalenergy associated with chemical bonds AUchemical inside this battery during the charging period? Howwould you define the efficiency n of the charging process and what is the value of this efficiency forthis battery during the above-mentioned charging process? State your answer after careful depictionb. (5 marks) The same (charged) battery is now allowed to cool to ambient temperature. After itcools, it is discharged over a period of 3 hours during which it loses loss = 2 MJ of heat to the ambientand gets heated to 40 °C. At the end of the discharge period, the battery is once again allowed to cooldown to ambient temperature. At the end of the cool-down period, the battery is restored to its originalstate (the state before the charging process). How much electricity did the battery generate (in kWh)while discharging? How would you define and calculate the round-trip efficiency of this battery?Round-trip, efficiencies are critical to energy storage applications and are related to the energy lostduring charge-discharge cycles.​

Answer 1

Answer:

Return the battery into the lithium-ion charger and give it a full charge, which should take around 3 hours depending on what type of Li-ion battery you are reconditioning. Some chargers automatically progress from recovery mode to charging, so on these devices you can just leave the battery in place throughout.

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