Method and device for judging the condition of secondary batteries and method for regenerating secondary batteries
First Claim
1. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of varying a charging current or discharging current of the secondary battery, calculating a quantity of electricity, which is related to a follow-up variation characteristic of a terminal voltage of the secondary battery, relative to a variation of said charging current or discharging current, and judging the condition related to the charging and discharging performance of the secondary battery based on said quantity of electricity.
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Abstract
The internal resistance related value which is related to the internal resistance of a secondary battery is compared with a previously obtained relation between the internal resistance related value and battery condition to judge the battery condition of the secondary battery. Since the internal resistance related value is a value related to the internal resistance which closely depends on the battery condition, the battery condition can be judged in detail based on the above relation. And the internal resistance related value can be obtained more speedily with a predetermined method. On the other hand, when the level of the degradation of a negative electrode is low, an electrolyte is supplemented, and when the level of the degradation of the negative electrode is high, a reducing agent is added to the electrolyte to regenerate the secondary battery. With this regenerating method, the performance of the negative electrode can be recovered without degrading a positive electrode.
51 Citations
61 Claims
- 1. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of varying a charging current or discharging current of the secondary battery, calculating a quantity of electricity, which is related to a follow-up variation characteristic of a terminal voltage of the secondary battery, relative to a variation of said charging current or discharging current, and judging the condition related to the charging and discharging performance of the secondary battery based on said quantity of electricity.
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11. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of:
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interrupting charging or discharging after charging or discharging with a predetermined current is performed in the secondary battery for a predetermined period of time, obtaining a voltage difference between a terminal voltage measured between a positive electrode terminal and negative electrode terminal when charging or discharging is interrupted, and a terminal voltage measured after charging or discharging is interrupted to obtain an internal resistance related value, which is related to an internal resistance of the secondary battery, based on said voltage difference and said predetermined current; and
comparing said internal resistance related value with a previously obtained relation between said internal resistance related value and battery condition, thereby judging the battery condition of the secondary battery. - View Dependent Claims (12, 13, 14, 15)
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- 16. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of detecting a quantity of electricity, which is related to an impedance of the secondary battery, or a quantity of electricity, which is related to a maximum power density by applying an AC voltage to the secondary battery, and judging the performance of the secondary battery based on said detected quantity of electricity.
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27. A device for judging the condition of a secondary battery, characterized in that the device comprises:
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a voltage applying element for applying AC voltages having a large number of different frequencies to the secondary battery simultaneously or successively;
a terminal voltage detecting element for detecting a terminal voltage of the secondary battery against each frequency;
a current detecting element for detecting the electric current of the secondary battery against each frequency;
an AC impedance component detecting element for detecting the AC impedance component of the secondary battery, which varies with the frequency of the applied AC voltage, based on the detected terminal voltage and electric current; and
a discharging performance judging element for judging at least the discharging performance of the secondary battery based on said AC impedance component. - View Dependent Claims (30)
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28. A device for judging the condition of the secondary battery, characterized in that the device comprises:
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an AC voltage applying element for applying AC voltages having a large number of different frequencies to the secondary battery simultaneously or successively;
a terminal voltage detecting element for detecting a terminal voltage of the secondary battery against each frequency;
a current detecting element for detecting the electric current of the secondary battery against each frequency;
a DC impedance component detecting element for detecting the DC impedance of the secondary battery, which does not vary with the frequency of the applied AC voltage, based on the detected terminal voltage and electric current; and
a discharging performance judging element for determining whether the detected DC impedance related quantity of electricity is a predetermined value or less and judging at least the discharging performance of the secondary battery based on the AC impedance component. - View Dependent Claims (29)
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- 31. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of obtaining a first resistance component mainly composed of an ion conduction resistance of an electrolyte by a predetermined method as an internal resistance related value which is related to the internal resistance of the secondary battery, and comparing said first resistance component with a previously obtained relation between the first resistance component and battery condition to judge the condition of the secondary battery.
- 32. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of obtaining a second resistance component mainly composed of a reaction resistance of electrodes by a predetermined method as an internal resistance related value which is related to the internal resistance of the secondary battery, and comparing said second resistance component with a previously obtained relation between the second resistance component and battery condition to judge the condition of the secondary battery.
- 33. A method for judging the condition of a secondary battery, characterized in that the method comprising the steps of obtaining a first resistance component mainly composed of a ion conduction resistance of an electrolyte, and a second resistance component mainly composed of a reaction resistance of electrodes respectively by a predetermined method as the internal resistance related values which are related to the internal resistance of the secondary battery, and comparing both the first and second resistance components with a previously obtained relation between the first and second resistance components and the battery condition to judge the condition of the secondary battery.
- 34. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of obtaining a first resistance component mainly composed of a ion conduction resistance of an electrolyte, and a second resistance component mainly composed of a reaction resistance of electrodes respectively by a predetermined method as the internal resistance related values which are related to the internal resistance of the secondary battery, and obtaining a resistance component ratio showing the ratio of the first resistance component and second resistance component, and comparing said resistance component ratio with a previously obtained relation between the resistance component ratio and the battery condition to judge the condition of the secondary battery.
- 38. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of obtaining a first resistance component mainly composed of an ion conduction resistance of an electrolyte, and a second resistance component mainly composed of a reaction resistance of electrodes respectively by a predetermined method as the internal resistance related value which is related to the internal resistance of the secondary battery, plotting an internal resistance co-ordinate showing a co-ordinate of the internal resistance of the secondary battery in a plane co-ordinate of which one axis component is the first resistance component and the other axis component is the second resistance component, and comparing the internal resistance co-ordinate with a previously obtained relation between the internal resistance co-ordinate and battery condition, which has been previously plotted on the plane co-ordinate, to judge the condition of the secondary battery.
- 48. A method for judging the condition of a secondary battery, characterized in that the method comprises the steps of judging the level of the degradation of a negative electrode low when the average thickness of an oxidized layer formed on a surface of an active material of said negative electrode of the secondary battery is less than a predetermined standard, and judging the level of the degradation of the negative electrode high when the average thickness of said oxidized layer is the predetermined standard or more.
- 51. A method for regenerating a secondary battery, characterized in that an electrolyte is only supplemented when the level of the degradation of a negative electrode is low, and a reducing agent is added to said electrolyte when the level of the degradation of said negative electrode is high.
- 55. A method for regenerating a secondary battery, characterized in that an electrolyte is only supplemented when the level of the degradation of a negative electrode is low, and said negative electrode is taken from a battery container and is subjected to a reducing treatment when the level of the degradation of said negative electrode is high.
Specification