Thank you for the reply.The only other problem is that if we use only battery then the life of battery will reduce owing to high current demands during acceleration etc so how do the teams manage with battery life reducing given the the fact that batteries are very costly.
That is a tricky question. Obviously you should size, setup, and program your components to keep the current within reasonable limits. Your motor controller shouldn't draw too much current, and the BMS should shut down during an over-current situation. Depending on your test schedule, you may not have the car running long enough to really damage the batteries. Or for testing, you might run a slightly lower current limit most of the time to reduce wear and tear, with only a few full current tests.
Texas A&M just keep an eye on the batteries and didn't push them too much before competition (especially since April in Texas is HOT), but our cars have had a very minimalist approach to the HV electrical system.