Method of measuring quantities indicating state of electrochemical device and apparatus for the same
First Claim
1. A method of detecting properties and state of charge of a battery that has electrodes and an ionic conductor by comparing(a) a series of theoretical data of an electrical characteristic of the battery, obtained by combining at least one of an electron transportation model of the electrode, an ion transportation model of the electrode, an ion conduction model of the ionic conductor, and a model of an electrochemical reaction taking place in an interface between the electrode and the ionic conductor, with a potential model of the electrode, with (b) a series of measured data of the electrical characteristic of the battery;
- wherein the electrical characteristic is at least one selected from a group of charging characteristic, current rate dependency of charging voltage, temperature dependency of charging voltage, discharging characteristic, current rate dependency of discharging voltage, temperature dependency of discharging voltage, and complex impedance;
wherein the property of the battery is a property of material that constitutes the battery, parameters of the theoretical data are determined so that the theoretical data approximates the measured data, and the property of the material is determined from the parameters.
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Abstract
A method of measuring quantities that indicates the state of an electrochemical device having an electrode and an ionic conductor, such as material properties or a residual capacity, without disassembling the device. The quantities are measured by comparing (a) a series of theoretical data of an electrical characteristic of the device obtained by combining at least one of an electron transportation model of the electrode, an ion transportation model of the electrode, an ion conduction model of the ionic conductor and a model of an electrochemical reaction taking place in an interface between the electrode and the ionic conductor, with a potential model of the electrode, with (b) a series of measured data of the electrical characteristic of the electrochemical device.
78 Citations
12 Claims
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1. A method of detecting properties and state of charge of a battery that has electrodes and an ionic conductor by comparing
(a) a series of theoretical data of an electrical characteristic of the battery, obtained by combining at least one of an electron transportation model of the electrode, an ion transportation model of the electrode, an ion conduction model of the ionic conductor, and a model of an electrochemical reaction taking place in an interface between the electrode and the ionic conductor, with a potential model of the electrode, with (b) a series of measured data of the electrical characteristic of the battery; -
wherein the electrical characteristic is at least one selected from a group of charging characteristic, current rate dependency of charging voltage, temperature dependency of charging voltage, discharging characteristic, current rate dependency of discharging voltage, temperature dependency of discharging voltage, and complex impedance;
wherein the property of the battery is a property of material that constitutes the battery, parameters of the theoretical data are determined so that the theoretical data approximates the measured data, and the property of the material is determined from the parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
wherein at least one of the electron transportation model, the ion transportation model, the ion conduction model, the model of an electrochemical reaction, and the potential model includes a model of temperature change in the battery, and the model of temperature change comprises at least one selected from a group of; - heat generated in the electrochemical reaction;
energy loss that accompanies the electrochemical reaction;
energy loss that accompanies ion transportation in the ionic conductor;
energy loss that accompanies ion transportation in the electrode; and
energy loss that accompanies electron transportation.
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12. An apparatus for detecting properties and state of charge of a battery by using a method according to claim 1, wherein the battery has electrodes and an ionic conductor, said apparatus comprising:
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(a) a memory section for storing a series of theoretical data of an electrical characteristic of the battery obtained by combining at least one of an electron transportation model of the electrode, an ion transportation model of the electrode, an ion conduction model of the ionic conductor, and a model of the electrochemical reaction taking place in an interface between the electrode and the ionic conductor, with a potential model of the electrode;
(b) an input section for entering a series of measured data of the electrical characteristic of the battery;
(c) an arithmetic operation section for comparing the theoretical data stored in said memory section with the measured data entered through said input section; and
(d) an output section for giving an output of a result of arithmetic operation from said arithmetic operation section.
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Specification