Battery control device and vehicle system
First Claim
1. A battery control device, comprising:
- a current sensor that detects a current flowing through a secondary battery;
a closed-circuit voltage sensor that detects an inter-terminal voltage of the secondary battery to acquire a closed-circuit voltage; and
a controller that is communicatively coupled to the current sensor and the close circuit voltage sensor, wherein the controller is configured to;
calculate an open-circuit voltage based on the closed circuit voltage;
calculate voltage difference obtained by subtracting the open-circuit voltage from the closed-circuit voltage,set a first time point and a second time point at which an absolute value of the voltage difference is equal to or less than a predetermined value and an absolute value of a difference of the open-circuit voltage becomes equal to or less than a predetermined value,determine a current integral amount, wherein the current integral amount is a time integral amount of a current flowing through the secondary battery between the first time point and the second time point,calculate a current error based on the current integral amount and a time from the first time point to the second time point,set the current error as a current correction amount; and
generates a detection signal using the current correction amount, wherein the detection signal indicates a State of Charge (SOC) of the secondary battery.
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Accused Products
Abstract
A device for controlling current for charging/discharging a battery with a high accuracy includes a time-point setting unit which calculates a voltage difference by subtracting a calculated open-circuit voltage from a measured closed-circuit voltage, and sets first and second time points, at which an absolute value of the voltage difference becomes equal to or less than a predetermined value and an absolute value of a difference in the open-circuit voltage becomes equal to or less than a predetermined value. The control device further includes a current correction amount calculation unit to obtain the current integral amount, calculate the current error in a detection signal and set the current error as the current correction amount on the basis of the current integral amount and the time from the first time point to the second time point. The current correction unit corrects the detection signal using the current correction amount.
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Citations
16 Claims
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1. A battery control device, comprising:
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a current sensor that detects a current flowing through a secondary battery; a closed-circuit voltage sensor that detects an inter-terminal voltage of the secondary battery to acquire a closed-circuit voltage; and a controller that is communicatively coupled to the current sensor and the close circuit voltage sensor, wherein the controller is configured to; calculate an open-circuit voltage based on the closed circuit voltage; calculate voltage difference obtained by subtracting the open-circuit voltage from the closed-circuit voltage, set a first time point and a second time point at which an absolute value of the voltage difference is equal to or less than a predetermined value and an absolute value of a difference of the open-circuit voltage becomes equal to or less than a predetermined value, determine a current integral amount, wherein the current integral amount is a time integral amount of a current flowing through the secondary battery between the first time point and the second time point, calculate a current error based on the current integral amount and a time from the first time point to the second time point, set the current error as a current correction amount; and generates a detection signal using the current correction amount, wherein the detection signal indicates a State of Charge (SOC) of the secondary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification