LIFETIME ESTIMATING METHOD AND DETERIORATION SUPPRESSING METHOD FOR RECHARGEABLE LITHIUM BATTERY, LIFETIME ESTIMATING APPARATUS, DETERIORATION SUPPRESSOR, AND BATTERY PACK AND CHARGER USING THE SAME
First Claim
1. A method of estimating lifetime of a rechargeable lithium battery, the rechargeable lithium battery comprising:
- a positive electrode having a positive active material capable of absorbing and releasing lithium ions;
a negative electrode having a negative active material containing at least one of elements, silicon and tin; and
an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode,the method comprising;
A) detecting open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on;
B) plotting at least the two of the voltage values detected in step A with respect to respective cycle numbers;
C) drawing a circular arc passing the plotted points of step B; and
D) estimating lifetime of the rechargeable lithium battery based on a size of the circular arc drawn in step C.
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Accused Products
Abstract
In a lifetime estimating method for a rechargeable lithium battery, the open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers are detected while charge/discharge cycles go on. Next, at least the two of the voltage values are plotted for respective cycle numbers, and a circular arc passing the plotted points is drawn. Furthermore, the lifetime of the rechargeable lithium battery is estimated based on a size of the circular arc. The progression of deterioration can be suppressed by controlling the charge and discharge of the rechargeable lithium battery based on the lifetime estimation.
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Citations
28 Claims
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1. A method of estimating lifetime of a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the method comprising; A) detecting open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; B) plotting at least the two of the voltage values detected in step A with respect to respective cycle numbers; C) drawing a circular arc passing the plotted points of step B; and D) estimating lifetime of the rechargeable lithium battery based on a size of the circular arc drawn in step C. - View Dependent Claims (2, 3, 4, 5)
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6. A method of suppressing deterioration of a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the method comprising; A) detecting open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; B) plotting at least the two of the voltage values detected in step A with respect to respective cycle numbers; C) drawing a circular arc passing the plotted points of step B; D) estimating lifetime of the rechargeable lithium battery based on a size of the circular arc drawn in step C; and F) controlling charge of the rechargeable lithium battery based on the lifetime estimated in step D. - View Dependent Claims (7, 8, 9)
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10. A method of suppressing deterioration of a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the method comprising; A) detecting open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; B) plotting at least the two of the voltage values detected in step A with respect to respective cycle numbers; C) drawing a circular arc passing the plotted points of step B; D) estimating lifetime of the rechargeable lithium battery based on a size of the circular arc drawn in step C; and F) controlling discharge of the rechargeable lithium battery based on the lifetime estimated in step D. - View Dependent Claims (11, 12, 13)
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14. A lifetime estimating apparatus for a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the apparatus comprising; a detecting section configured to detect open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; a plot section configured to plot at least the two of the detected voltage values for respective cycle numbers; an estimating section configured to draw a circular arc passing the plotted points plotted by the plot section; and a determining section configured to estimate lifetime of the rechargeable lithium battery based on a size of the circular arc. - View Dependent Claims (15, 16, 17, 18)
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19. A deterioration suppressor for a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the deterioration suppressor comprising; a detecting section configured to detect open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; a plot section configured to plot at least the two of the detected voltage values for respective cycle numbers; an estimating section configured to draw a circular arc passing the plotted points plotted by the plot section; and a determining section configured to estimate lifetime of the rechargeable lithium battery based on a size of the circular arc; and a control section configured to control charge of the rechargeable lithium battery based on the lifetime estimated by the determining section. - View Dependent Claims (20)
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21. A battery pack comprising:
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a rechargeable lithium battery including; a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, a detecting section configured to detect open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; a plot section configured to plot at least the two of the detected voltage values for respective cycle numbers; an estimating section configured to draw a circular arc passing the plotted points plotted by the plot section; a determining section configured to estimate lifetime of the rechargeable lithium battery based on a size of the circular arc; and a control section configured to control charge of the rechargeable lithium battery based on the lifetime estimated by the determining section. - View Dependent Claims (22)
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23. A charger for a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the charger comprising; a deterioration suppressor including; a detecting section configured to detect open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; a plot section configured to plot at least the two of the detected voltage values for respective cycle numbers; an estimating section configured to draw a circular arc passing the plotted points plotted by the plot section; a determining section configured to estimate lifetime of the rechargeable lithium battery based on a size of the circular arc; a control section configured to control charge of the rechargeable lithium battery based on the lifetime estimated by the determining section; and a charging section configured to charge the rechargeable lithium battery. - View Dependent Claims (24)
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25. A deterioration suppressor for a rechargeable lithium battery, the rechargeable lithium battery comprising:
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a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, the deterioration suppressor comprising; a detecting section configured to detect open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; a plot section configured to plot at least the two of the detected voltage values for respective cycle numbers; an estimating section configured to draw a circular arc passing the plotted points plotted by the plot section; a determining section configured to estimate lifetime of the rechargeable lithium battery based on a size of the circular arc; and a control section configured to control discharge of the rechargeable lithium battery based on the lifetime estimated by the determining section. - View Dependent Claims (26)
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27. A battery pack comprising:
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a rechargeable lithium battery including; a positive electrode having a positive active material capable of absorbing and releasing lithium ions; a negative electrode having a negative active material containing at least one of elements, silicon and tin; and an electrolyte having lithium-ion conductivity and disposed between the positive electrode and the negative electrode, a detecting section configured to detect open circuit voltages of the rechargeable lithium battery after discharging for at least two different charge/discharge cycle numbers while charge/discharge cycles go on; a plot section configured to plot at least the two of the detected voltage values for respective cycle numbers; an estimating section configured to draw a circular arc passing the plotted points plotted by the plot section; a determining section configured to estimate lifetime of the rechargeable lithium battery based on a size of the circular arc; and a control section configured to control discharge of the rechargeable lithium battery based on the lifetime estimated by the determining section. - View Dependent Claims (28)
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Specification