ESTIMATED CHARGING AMOUNT CALCULATOR OF RECHARGEABLE BATTERY
First Claim
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1. An estimated charging amount calculator of a rechargeable battery comprising:
- a terminal voltage estimating means that estimates a terminal voltage of a rechargeable battery based on an estimated charging amount, which is a physical quantity expressing an amount of charge of the rechargeable battery per unit time, and a history of a charge/discharge of the rechargeable battery;
a charge/discharge current calculation means that uses a detected value of the terminal voltage of the rechargeable battery as an input, and calculates a charge/discharge current of the rechargeable battery such that an estimated value of the terminal voltage produced by the terminal voltage estimating means approaches to the detected value;
an integration process means that accepts the charge/discharge current calculated by the charge/discharge current calculation means as an input, and performs an integration process of the charge/discharge current of the rechargeable battery; and
an estimated charging amount calculation means (S40, S40a) that calculates an estimated charging amount based on an integrated value of the integration process means.
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Abstract
A charge/discharge current Iij where an absolute value of a difference of an estimated value (estimated cell voltage Vije(n)) of a terminal voltage of a battery cell and a detected value (cell voltage Vij(n)) that becomes equal to or less than a prescribed value ΔVth is searched by Newton'"'"'s method. The charge/discharge current Iij searched in this way is equalized in all the battery cells. A charging rate SOCij(n) of the battery cell is calculated by an integration calculation of a calculated average value Ia (n).
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Citations
7 Claims
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1. An estimated charging amount calculator of a rechargeable battery comprising:
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a terminal voltage estimating means that estimates a terminal voltage of a rechargeable battery based on an estimated charging amount, which is a physical quantity expressing an amount of charge of the rechargeable battery per unit time, and a history of a charge/discharge of the rechargeable battery; a charge/discharge current calculation means that uses a detected value of the terminal voltage of the rechargeable battery as an input, and calculates a charge/discharge current of the rechargeable battery such that an estimated value of the terminal voltage produced by the terminal voltage estimating means approaches to the detected value; an integration process means that accepts the charge/discharge current calculated by the charge/discharge current calculation means as an input, and performs an integration process of the charge/discharge current of the rechargeable battery; and an estimated charging amount calculation means (S40, S40a) that calculates an estimated charging amount based on an integrated value of the integration process means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification