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Electric vehicle and method for setting total allowable discharge electric energy in the electric vehicle

  • US 8,442,727 B2
  • Filed: 06/05/2009
  • Issued: 05/14/2013
  • Est. Priority Date: 06/05/2009
  • Status: Active Grant
First Claim
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1. An electric vehicle travelling by using power from a motor, said electric vehicle comprising:

  • a battery device having;

    a main secondary battery,a first auxiliary secondary battery anda second auxiliary secondary battery as a plurality of secondary batteries capable of exchanging electric power with said motor,a main connecting-releasing part that performs a connection of said main secondary battery to a side of said motor and release of said connection, anda second auxiliary connecting-releasing part that performs a connection of said second auxiliary secondary battery to a side of said motor and release of said connection;

    a charger that is connected to an external power supply in a state of system shutdown, and charges said plurality of secondary batteries by using electric power from said external power supply;

    a used secondary battery setting unit that sets a secondary battery in which an accumulated charge amount that is an electric energy that can be discharged reaches a preset accumulated charge amount or less out of said plurality of secondary batteries, as a used secondary battery;

    a battery device control unit that;

    controls said main connecting-releasing part so that said main secondary battery is connected to said side of said motor,controls a first auxiliary connecting-releasing part and said second auxiliary connecting-releasing part so that said first auxiliary secondary battery is connected to said side of said motor and said connection of said second auxiliary secondary battery and said side of said motor is released before said first auxiliary secondary battery is set as said used secondary battery, andcontrols said first auxiliary connecting-releasing part and said second auxiliary connecting-releasing part so that said connection of said first auxiliary secondary battery and said side of said motor is released and said second auxiliary secondary battery is connected said side of said motor after said first auxiliary secondary battery is set as said used secondary battery; and

    a total allowable discharge electric energy setting unit that;

    sets a total allowable discharge electric energy that is an electric energy that is allowed to be discharged in a whole of said battery device by using an allowable discharge electric energy that is said electric energy allowed to be discharged with respect to said main secondary battery, said allowable discharge electric energy with respect to said first auxiliary secondary battery, and said allowable discharge electric energy with respect to said second auxiliary secondary battery when said main secondary battery and said first auxiliary secondary battery are connected to said side of said motor, andsets said total allowable discharge electric energy by using said allowable discharge electric energy with respect to said main secondary battery and said allowable discharge electric energy with respect to said second auxiliary secondary battery without using said allowable discharge electric energy with respect to said first auxiliary secondary battery when said main secondary battery and said second auxiliary secondary battery are connected to said side of said motor.

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