BATTERY STATE DETECTION DEVICE
First Claim
1. A battery state detection device that detects whether a battery is normal or abnormal or a degree of deterioration of the battery, comprising:
- measurement means for measuring complex impedances in a diffusion region of the battery;
detection means for calculating a slope of a straight light or an approximate straight line which connects together two complex impedances or more of different frequencies in a diffusion region of the battery measured by the measurement means; and
storage means that preliminarily stores a threshold value corresponding to the slope used for determining whether the battery is normal or abnormal or the degree of deterioration of the battery, whereinthe detection means detects whether the battery is normal or abnormal or the degree of deterioration of the battery by use of the predetermined threshold value stored in the storage means and the calculated slope.
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Accused Products
Abstract
This device and method use the complex impedance of a rechargeable battery to detect the state of the rechargeable battery. A computer determines the slope of the complex impedance at least two different frequencies in a diffusion region of the rechargeable battery when a straight-line approximation has been made, and compares the slope with a threshold value. If the slope is greater than or equal to the threshold value, the computer determines that the battery has a normal capacity balance, and if the slope is less than the threshold value, the computer determines that the battery has an abnormal unbalanced capacity. Furthermore, if the magnitude of an imaginary axis component of the complex impedance in the diffusion region of the rechargeable battery is greater than the threshold battery, the computer determines that the battery has an abnormal capacity balance, and if said magnitude is less than or equal to the threshold value, the computer determines that the battery has a normal capacity balance.
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Citations
11 Claims
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1. A battery state detection device that detects whether a battery is normal or abnormal or a degree of deterioration of the battery, comprising:
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measurement means for measuring complex impedances in a diffusion region of the battery; detection means for calculating a slope of a straight light or an approximate straight line which connects together two complex impedances or more of different frequencies in a diffusion region of the battery measured by the measurement means; and storage means that preliminarily stores a threshold value corresponding to the slope used for determining whether the battery is normal or abnormal or the degree of deterioration of the battery, wherein the detection means detects whether the battery is normal or abnormal or the degree of deterioration of the battery by use of the predetermined threshold value stored in the storage means and the calculated slope. - View Dependent Claims (2, 3, 4)
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5. A battery state detection device that detects whether a battery is normal or abnormal or a degree of deterioration of the battery, comprising:
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measurement means for measuring a complex impedance in a diffusion region of the battery which is identical with a frequency of a reference complex impedance, or a complex impedance in a diffusion region, of a base battery that serves as a reference on occasion of comparison of the battery; detection means for detecting a distance between the reference complex impedance and the complex impedance measured by the measurement means and a slope of a straight line that connects the reference complex impedance to the complex impedance measured by the measurement means; and storage means that preliminarily stores a threshold value corresponding to the distance and a threshold value corresponding to the slope, which are used for determining whether the battery is normal or abnormal or the degree of deterioration of the battery, wherein the detection means detects whether the battery is normal or abnormal or the degree of deterioration of the battery by use of the calculated distance, the calculated slope, a threshold value corresponding to the distance stored in the storage means, and a threshold value corresponding to the slope stored in the storage means. - View Dependent Claims (6, 7, 8)
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9. A battery state detection device for detecting whether a battery is normal or abnormal, comprising:
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measurement means for measuring a complex impedance of a first frequency in a diffusion region of the battery; detection means for calculating at least any one of a real-axis component, an imaginary-axis component, and a magnitude of the complex impedance of the first frequency measured by the measurement means; and storage means that preliminarily stores a predetermined threshold value corresponding to at least any one of the real-axis component, the imaginary-axis component, and the magnitude of the complex impedance of the first frequency, which is acquired by the measurement means and used for determining whether the battery is normal or abnormal, wherein the detection means detects whether the battery is normal or abnormal by comparing at least any one of the real-axis component, the imaginary-axis component, and the magnitude of the complex impedance of the first frequency with a threshold value corresponding to at least any one of the real-axis component, the imaginary-axis component, and the magnitude of the complex impedance of the first frequency stored in the storage means. - View Dependent Claims (10, 11)
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Specification