STATE OF CHARGE COMPUTATION SYSTEM
First Claim
1. A state of charge computation system comprising:
- a voltage-caused estimated state of charge calculating unit that outputs a first estimated state of charge on the basis of an estimated open voltage of a secondary battery;
a current-caused estimated state of charge calculating unit that outputs a second estimated state of charge on the basis of the result obtained by integrating a measured current of the secondary battery and the upper limit of an error of the measured current with a predetermined cycle and the capacity of the secondary battery, outputs a third estimated state of charge on the basis of the result obtained by integrating the measured current and the lower limit of the error of the measured current with the predetermined cycle and the battery capacity, and outputs a fourth estimated state of charge on the basis of the result obtained by integrating the measured current with the predetermined cycle and the battery capacity; and
a state of charge output unit that receives the first to fourth estimated states of charge, outputs the fourth estimated state of charge as a state of charge within the period of the predetermined period, outputs the first estimated state of charge as the state of charge when the first estimated state of charge is between the second estimated state of charge and the third estimated state of charge at an end point of the predetermined cycle, outputs the second estimated state of charge as the state of charge when the first estimated state of charge is equal to or greater than the second estimated state of charge, and outputs the third estimated state of charge as the state of charge when the first estimated state of charge is equal to or less than the third estimated state of charge.
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Accused Products
Abstract
A first estimated state of charge is output based on an estimated open voltage of a secondary battery. A second estimated state of charge is output based on the result obtained by integrating the measured current of the secondary battery and the upper limit of the error of the measured current and the capacity of the secondary battery. A third estimated state of charge is output based on the result obtained by integrating the measured current and the lower limit of the error of the measured current and the battery capacity. A fourth estimated state of charge is output based on the result obtained by integrating the measured current and the battery capacity. The fourth estimated state of charge is output as a state of charge within the period of the predetermined period.
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Citations
14 Claims
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1. A state of charge computation system comprising:
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a voltage-caused estimated state of charge calculating unit that outputs a first estimated state of charge on the basis of an estimated open voltage of a secondary battery; a current-caused estimated state of charge calculating unit that outputs a second estimated state of charge on the basis of the result obtained by integrating a measured current of the secondary battery and the upper limit of an error of the measured current with a predetermined cycle and the capacity of the secondary battery, outputs a third estimated state of charge on the basis of the result obtained by integrating the measured current and the lower limit of the error of the measured current with the predetermined cycle and the battery capacity, and outputs a fourth estimated state of charge on the basis of the result obtained by integrating the measured current with the predetermined cycle and the battery capacity; and a state of charge output unit that receives the first to fourth estimated states of charge, outputs the fourth estimated state of charge as a state of charge within the period of the predetermined period, outputs the first estimated state of charge as the state of charge when the first estimated state of charge is between the second estimated state of charge and the third estimated state of charge at an end point of the predetermined cycle, outputs the second estimated state of charge as the state of charge when the first estimated state of charge is equal to or greater than the second estimated state of charge, and outputs the third estimated state of charge as the state of charge when the first estimated state of charge is equal to or less than the third estimated state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification