Method and device for inspecting secondary battery precursor and method for manufacturing secondary battery using the inspection method
First Claim
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1. A method for manufacturing a secondary battery comprising:
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrode ; and
inspecting the secondary battery precursor,wherein the step of inspecting the secondary battery precursor comprises;
applying a constant inspection voltage between the pair of electrodes before an electrolyte solution is injected between the pair of electrodes, and measuring a current flowing due to application of the inspection voltage at intervals of 1 ms or less; and
determining the precursor to be defective if a current value exceeding a previously set reference current value is detected within a time period corresponding to a time period between an appearance of peak current due to an inrush current and obtaining of a constant current when a voltage is applied to a normal secondary battery precursor, the time period being within 60 milliseconds from starting of the application of the inspection voltage.
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Abstract
A method for testing a precursor of a secondary cell with high reliability and high efficiency to judge the precursor to be acceptable or defective. The current flowing when a test voltage is applied between a pair of electrodes is measured before an electrolyte is placed between the electrodes. If a current the current value of which exceeds a predetermined reference current value (13) is detected during the time from the start of application of a voltage to a normal secondary cell precursor until the current becomes constant, the precursor is determined to be defective.
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Citations
25 Claims
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1. A method for manufacturing a secondary battery comprising:
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrode ; and
inspecting the secondary battery precursor,wherein the step of inspecting the secondary battery precursor comprises; applying a constant inspection voltage between the pair of electrodes before an electrolyte solution is injected between the pair of electrodes, and measuring a current flowing due to application of the inspection voltage at intervals of 1 ms or less; and determining the precursor to be defective if a current value exceeding a previously set reference current value is detected within a time period corresponding to a time period between an appearance of peak current due to an inrush current and obtaining of a constant current when a voltage is applied to a normal secondary battery precursor, the time period being within 60 milliseconds from starting of the application of the inspection voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrode ; and
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9. A method for manufacturing a secondary battery comprising:
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes; and
inspecting the secondary battery precursor,wherein the step of inspecting the secondary battery precursor comprises; applying an inspection voltage between the pair of electrodes before an electrolyte solution is injected between the pair of electrodes, and measuring a current flowing due to application of the inspection voltage at intervals of 1 ms or less; and determining the precursor to be defective if the current has a value beyond a predetermined allowable range within 60 milliseconds from starting of the application of the inspection voltage, the allowable range being calculated based on a current waveform when a voltage is applied to a normal secondary battery precursor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes; and
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18. A method for manufacturing a secondary battery comprising:
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes; and
inspecting the secondary battery precursor,wherein the step of inspecting the secondary battery precursor comprises; applying an inspection current between the pair of electrodes before an electrolyte solution is injected between the pair of electrodes, and measuring a voltage due to application of the inspection current at intervals of 1 ms or less; and determining the precursor to be defective if the voltage has a value beyond a predetermined allowable range within 60 milliseconds from starting of the application of the inspection current, the allowable range being calculated based on a voltage waveform when a current is applied to a normal secondary battery precursor. - View Dependent Claims (19, 20, 21)
- making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes; and
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22. A device for inspecting a secondary battery precursor including a pair or electrodes, and a separator disposed between the pair of electrodes, comprising:
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voltage application means for applying an inspection voltage between the pair of electrodes; current measurement means for measuring a current flowing due to application of the inspection voltage at intervals of 1 ms or less; storage means for storing a reference current value set based on a current when a voltage is applied to a normal secondary battery precursor; and arithmetic operation means for performing a predetermined arithmetic operation using the reference current value stored in the storage means and a value of the current measured by the current measurement means, so as to determine whether the secondary battery precursor is defective or not, wherein the precursor is determined to be defective if the current measured by the current measurement means has a value beyond the reference current value within 60 milliseconds from starting of the application of the inspection voltage. - View Dependent Claims (23)
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24. A device for inspecting a secondary battery precursor including a pair or electrodes, and a separator disposed between the pair of electrodes, comprising:
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current application means for applying an inspection current between the pair of electrodes; voltage measurement means for measuring a voltage generated due to application of the inspection current at intervals of 1 ms or less; storage means for storing a reference voltage value set based on a voltage when a current is applied to a normal secondary battery precursor; and arithmetic operation means for performing a predetermined arithmetic operation using the reference voltage value stored in the storage means and a value of the voltage measured by the voltage measurement means, so as to determine whether the secondary battery precursor is defective or not, wherein the precursor is determined to be defective if the voltage measured by the voltage measurement means has a value beyond the reference voltage value within 60 milliseconds from starting of the application of the inspection current. - View Dependent Claims (25)
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Specification