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What are suitable lithium ion batteries for a 15lb. battlebot?

I have forgotten some of the rules. You might suppose the ‘bot needs to continously accelerate and decelerate for the length of a match. Say 4m/s^2. Take the mass of the ‘bot, and solve for the energy needed. Add in the energy needed for electronics, and any safety factor (x2). After you get how many Joules you need, and a minimum voltage for your motors (or more likely electronics) Shop for a battery that meets the requirements with the minimum weight.

http://www.ajdesigner.com/constantacceleration/cavelocity.php
gives velocity

http://www.ajdesigner.com/phpenergykenetic/kenetic_energy_equation.php
gives energy

For a 2-minute run, I get 807kJ

Divide Energy (joules) by volts (J/Coloumb) to get Amp-seconds. Divide A-s by 3,600 to get A *hours*, which is a standard rating (curves) for larger cells.

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One response to “What are suitable lithium ion batteries for a 15lb. battlebot?”

  1. Jerry Lee Avatar
    Jerry Lee

    I have forgotten some of the rules. You might suppose the 'bot needs to continously accelerate and decelerate for the length of a match. Say 4m/s^2. Take the mass of the 'bot, and solve for the energy needed. Add in the energy needed for electronics, and any safety factor (x2). After you get how many Joules you need, and a minimum voltage for your motors (or more likely electronics) Shop for a battery that meets the requirements with the minimum weight.

    http://www.ajdesigner.com/constantacceleration/cavelocity.php
    gives velocity

    http://www.ajdesigner.com/phpenergykenetic/kenetic_energy_equation.php
    gives energy

    For a 2-minute run, I get 807kJ

    Divide Energy (joules) by volts (J/Coloumb) to get Amp-seconds. Divide A-s by 3,600 to get A *hours*, which is a standard rating (curves) for larger cells.
    References :

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