WO2004021498A1 - 二次電池前駆体の検査方法およびその検査装置ならびにその方法を用いた二次電池の製造方法 - Google Patents
二次電池前駆体の検査方法およびその検査装置ならびにその方法を用いた二次電池の製造方法 Download PDFInfo
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- WO2004021498A1 WO2004021498A1 PCT/JP2003/010361 JP0310361W WO2004021498A1 WO 2004021498 A1 WO2004021498 A1 WO 2004021498A1 JP 0310361 W JP0310361 W JP 0310361W WO 2004021498 A1 WO2004021498 A1 WO 2004021498A1
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- secondary battery
- voltage
- current
- inspection
- battery precursor
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method and an apparatus for inspecting a secondary battery precursor, and further relates to a method for manufacturing a secondary battery.
- the present invention particularly relates to a non-crushing test for detecting, for example, a secondary battery precursor having insufficient insulation between electrodes from a plurality of manufactured secondary battery precursors.
- a secondary battery manufacturing process it is required to detect a product in which electrodes are short-circuited or a product in which short-circuiting is likely to occur. This detection is performed on an electrode body including a positive electrode, a negative electrode, and a separator disposed between these electrode plates before injecting the electrolytic solution into the battery case.
- a method of this detection there is disclosed a method of measuring the insulation resistance of an electrode body when a voltage is applied between the positive electrode and the negative electrode (see JP-A-8-45538).
- a method for determining a non-defective product and a non-defective product is disclosed (see Japanese Patent Application Laid-Open No. 2000-195655).
- a method for detecting a secondary battery precursor according to the present invention is a method for inspecting a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes, wherein the method includes: Before injecting the electrolytic solution into the electrode, a current flowing with the application of the inspection voltage is measured while applying a constant inspection voltage between the pair of electrodes, and a normal secondary battery precursor is measured.
- the precursor is determined to be defective.
- the inspection can be completed before the current becomes constant, so that short products and potential short products can be detected in a short time.
- the reference current value is set based on the current when a voltage is applied to a normal secondary battery precursor, highly accurate inspection can be performed. Also, a plurality of reference current values may be set according to time. In this case, the reference current value may be set at intervals of 1 ms or less.
- a normal secondary battery precursor is, for example, a battery that has no problem in initial battery characteristics and in characteristics even after performing 50 or more charge / discharge cycles.
- the reference current value is a value obtained by averaging 100 charging current waveforms obtained by measuring 100 normal secondary battery precursors.
- a defective product is determined from a temporal change (current waveform) of a current when a voltage is applied to a normal secondary battery precursor.
- This inspection method is a method for inspecting a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes, wherein an electrolyte is injected between the pair of electrodes. While applying an inspection voltage between the pair of electrodes, a current flowing with the application of the inspection voltage is measured, and the current is a current waveform when a voltage is applied to a normal secondary battery precursor. If the value exceeds a predetermined allowable range calculated based on the above, the precursor is determined to be defective.
- the applied voltage may be a constant voltage or a voltage that increases at a constant speed.
- Another inspection method of the present invention is an inspection method of a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes, wherein an electrolytic solution is interposed between the pair of electrodes. Before the injection, a voltage accompanying the application of the test current is measured while applying a test current between the pair of electrodes, and the voltage is applied to a normal secondary battery precursor. If the value exceeds a predetermined allowable range calculated based on the above voltage waveform, the precursor is determined to be defective. With this method, the same effect as the above method can be obtained.
- the inspection current is not limited, but may be a constant current.
- the current measurement when the voltage is increased at a constant speed or the voltage measurement when a constant current is applied may be inspected by a change value with respect to the time derivative.
- the inspection method of the present invention can be applied even when the distance between the positive and negative electrodes is reduced to about 25 ⁇ m or less.
- the inspection voltage may be less than 75 V per 1 m of separator thickness, or less than 11 V or less than 35 V per separator thickness. In the above-described inspection method, the inspection voltage may be set to 420 V or more.
- the secondary battery precursor may be a precursor of a lithium secondary battery.
- a method for manufacturing a secondary battery of the present invention includes: a step of manufacturing a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes; Detecting by the inspection method of the present invention.
- An inspection device of the present invention is an inspection device for inspecting a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes.
- Voltage applying means for applying a voltage between the pair of electrodes; current measuring means for measuring a current flowing in accordance with the application of the voltage; current when a voltage is applied to a normal secondary battery precursor
- Storage means for storing a reference current value set on the basis of: a reference current value stored in the storage means; and a predetermined calculation using the current value measured by the current measurement means.
- Computing means for determining the failure of the secondary battery precursor.
- another inspection device of the present invention is an inspection device for inspecting a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes, wherein the inspection device includes a pair of electrodes.
- Current applying means for applying a current to the battery, voltage measuring means for measuring a voltage generated in accordance with the application of the current, and a reference set based on the voltage when the current is applied to the normal secondary battery precursor.
- a predetermined operation is performed using storage means for storing a voltage value; the reference voltage value stored in the storage means; and the voltage value measured by the voltage measurement means, to perform the secondary battery precursor.
- an operation means for judging the defect is a value obtained by averaging 100 voltage waveforms obtained by measuring 100 normal secondary battery precursors.
- secondary battery precursor is used as a term indicating an unfinished secondary battery including at least a pair of electrodes and a separator, such as a semi-finished product called an electrode body.
- the secondary battery precursor may or may not include a battery case.
- produced and the secondary battery precursor which may generate
- ADVANTAGE OF THE INVENTION According to this invention even if it is a secondary battery precursor which has a thin separator, it becomes possible to remove
- FIG. 1 is a circuit diagram of an example of the inspection device of the present invention.
- FIG. 2 is a diagram showing an example of a charging current waveform when a constant voltage is applied to a non-defective secondary battery precursor.
- FIG. 3 is a diagram illustrating an example of a charging current waveform when a constant voltage is applied to a secondary battery precursor that is internally short-circuited.
- FIG. 4 is a diagram showing an example of a charging current waveform at the time of constant voltage of a secondary battery precursor that may be internally short-circuited.
- FIG. 5 is a diagram showing an example of a relationship between a charging current waveform of a secondary battery precursor and a reference current value.
- FIG. 6 is a diagram showing an example of a charging current waveform when a voltage that increases at a constant speed is applied to a non-defective secondary battery precursor.
- FIG. 7 is a diagram illustrating an example of a charging current waveform when a voltage that increases at a constant speed is applied to a secondary battery precursor that is internally short-circuited.
- FIG. 8 is a diagram illustrating an example of a charging current waveform when a voltage that increases at a constant speed is applied to a secondary battery precursor that may be internally short-circuited.
- FIG. 9 is a diagram illustrating an example of a voltage waveform when a constant current is applied to a non-defective secondary battery precursor.
- FIG. 10 is a diagram showing an example of a voltage waveform when a constant current is applied to a secondary battery precursor that is internally short-circuited.
- FIG. 11 is a diagram illustrating an example of a voltage waveform when a constant current is applied to a secondary battery precursor that may be internally short-circuited.
- FIG. 12 is a diagram illustrating an example of a differential value of a current when a voltage is applied to a secondary battery precursor that may be internally short-circuited.
- FIG. 13 is a diagram illustrating an example of a differential value of a voltage when a constant current is applied to a secondary battery precursor that may be internally short-circuited.
- FIG. 14 is a cross-sectional view schematically showing one example of the secondary battery manufactured by the manufacturing method of the present invention.
- FIG. 15 is a cross-sectional view schematically illustrating the electrode body manufactured in the example. BEST MODE FOR CARRYING OUT THE INVENTION
- the inspection method and the inspection apparatus will be described. If a foreign substance is present between the electrodes or the separator is defective, the insulation distance between the positive electrode and the negative electrode is substantially reduced. In this case, when charging the electrode body, a discharge phenomenon (surface discharge) along the surface of the porous separator is likely to occur. The current based on the creeping discharge can be detected by using the inspection method of the present invention. Creepage discharge can be detected even if the distance between the positive and negative electrodes is extremely small.
- the creeping discharge phenomenon includes a partial discharge phenomenon that is a local discharge within the separator, and an arc discharge phenomenon that is a discharge between the positive and negative electrodes.
- This inspection method is an inspection method for a secondary battery precursor (electrode group) including at least a pair of electrodes (a positive electrode and a negative electrode) and a separator disposed between the pair of electrodes.
- the electrolyte flows along with the application of the inspection voltage while applying a constant inspection voltage between the pair of electrodes. Measure the current. Then, when a current value exceeding a preset reference current value is detected during a time corresponding to a period from the start of application of the voltage to the normal secondary battery precursor to the time when the current becomes constant, the relevant current value is determined. The precursor is determined to be defective.
- the present invention it is also possible to end the inspection in a time until the current becomes constant when a voltage is applied to a normal secondary battery precursor. This is because the abnormal current due to creeping discharge, which is characteristic of short products and potential short products, is observed during the period of charging between a pair of electrodes. Inspection methods that can complete inspections in a short time are advantageous for introduction into mass production processes.
- the reference current value can be set based on the current when a voltage is applied to a normal secondary battery precursor. It is preferable to set a plurality of reference current values according to time. Inspection accuracy can be improved by setting a plurality of different reference current values depending on time based on a charging current waveform when a voltage is applied to a normal secondary battery precursor.
- the reference current value is preferably determined as a value that is higher by a predetermined ratio or a predetermined value than the current waveform measured for the normal precursor.
- the interval for setting the reference current value may be set to 1 millisecond or less (for example, 50 to 500 microseconds) intermittently or continuously.
- the current flowing with the application of the inspection voltage is measured while applying the inspection voltage between the pair of electrodes. . If the measured current exceeds a predetermined allowable range calculated based on the current waveform (reference waveform) when a voltage is applied to a normal secondary battery precursor, The body is determined to be defective.
- the allowable range may be set appropriately, but in practice
- the locus drawn by a waveform that is 5 to 20% higher than the reference waveform may be set as the upper limit of the allowable range.
- the current measurement interval may be set to be as short as the above interval.
- a constant voltage may be used as the inspection voltage, or a voltage that increases at a constant speed may be used.
- the voltage accompanying the application of the inspection current is measured while applying the inspection current between the pair of electrodes. . If the measured voltage exceeds a predetermined allowable range calculated based on a voltage waveform when a current is applied to a normal secondary battery precursor, the precursor is regarded as a defective product. judge.
- the inspection current may be a constant current.
- the applied voltage is preferably less than 75 V, preferably 62.5 V or less per 1 ⁇ m of the thickness of the separator so as to perform the non-breaking test.
- the applied voltage is preferably less than 150 V, particularly preferably 125 V or less.
- the applied voltage should be less than 35 V per 1 m of the separator thickness.
- the voltage to be applied is the maximum value, which is the set voltage value in the case of inspection by applying a constant voltage, and the voltage value at the end of voltage application in the case of an inspection in which the voltage is increased at a constant speed. .
- the present invention exerts a remarkable effect when the thickness of the separator is 25 ⁇ m or less.
- the present invention is not limited to the type of the secondary battery precursor to be applied, but the present invention is easily applicable even if the separator is a thin precursor of a lithium ion secondary battery.
- the lower limit of the preferable range of applied voltage is although it depends on the precursor, the voltage is preferably 20 V or more per 1 ⁇ m of separator thickness.For example, if the designed thickness is 20 m ⁇ 1 ⁇ m, the voltage is preferably 420 V or more .
- FIG. 1 For inspection of the secondary battery precursor, for example, an inspection device schematically shown in FIG. 1 may be used.
- the test equipment includes conductor 2, resistor 3, power supply 4, oscilloscope 5, switch 6, and terminal 10.
- a pair of electrodes of the secondary battery precursor 1 before the injection of the electrolyte is connected to the two terminals 10.
- the power supply 4 functions as a voltage applying unit that applies a voltage to the pair of electrodes of the secondary battery precursor 1 via the conductor 2.
- the oscilloscope 5 is connected in parallel with the resistor 3, and the voltage across the resistor 3 is converted to a current value by the oscilloscope 5.
- the oscilloscope 5 functions as a current measuring means for measuring a current flowing with the application of the voltage.
- a device having a memory and an arithmetic processing device may be used as the oscilloscope 5, a device having a memory and an arithmetic processing device may be used as the oscilloscope 5, a device having a memory and an arithmetic processing device may be used.
- the memory stores a reference current value set based on a current when a voltage is applied to a normal secondary battery value precursor.
- the arithmetic processing unit performs a predetermined arithmetic operation using the reference current value stored in the memory and the measured current value, and determines pass / fail of the secondary battery precursor 1.
- the memory and the arithmetic processing device may be prepared separately from the oscilloscope 5, and for example, a computer can be used.
- the power supply 4 functions as a means for applying a predetermined current.
- the oscilloscope functions as a means for measuring a voltage generated by applying a current.
- the memory stores a reference voltage value set based on a voltage when a current is applied to a normal secondary battery precursor.
- the arithmetic processing device is stored in the storage means. A predetermined calculation is performed using the reference voltage value and the voltage value measured by the voltage measuring means to determine the failure of the precursor.
- two terminals 10 are electrically connected to a pair of electrodes of the secondary battery precursor 1 respectively. It does not matter which of the two terminals 10 is connected to the positive electrode of the secondary battery precursor 1.
- the switch 6 is closed while the voltage is applied from the power supply 4, an abnormal waveform may be generated due to the influence of the chattering when the switch 6 and the conductor 2 come into contact with each other. Therefore, in order to increase the accuracy of the determination, it is preferable to start applying the voltage after the switch 6 is turned on. For the same reason, at the end of the inspection, the switch 6 should be opened after the voltage application is completed.
- the oscilloscope 5 As the oscilloscope 5 as the current measuring means, a device having a function of storing a normal charging current waveform as a reference waveform in advance may be used.
- the oscilloscope 5 draws a corresponding charging current waveform of the reference waveform while converting the voltage across the resistor 3 into a current value at predetermined time intervals. And performs a predetermined calculation based on the reference waveform. For example, the oscilloscope 5 calculates a difference between the measured current value and the current value on the reference waveform. Then, it is determined whether or not the calculation result is within a predetermined allowable range, and the result of the determination is preferably output.
- the first waveform is a non-defective waveform illustrated in FIG. As shown in Fig. 2, this waveform shows a peak due to the inrush current to the secondary battery precursor immediately after the voltage is applied, and thereafter, the current decreases with time.
- the second waveform is the waveform of the internal short-circuit product illustrated in FIG. As shown in Fig. 3, no peak of inrush current is observed in this waveform, and a large current continues to flow from the start of voltage application to the end of measurement.
- the third waveform is the waveform of a potential short-circuit that may short-circuit internally in the future, as illustrated in FIG. As shown in Fig. 4, this waveform has a peak 11 due to the inrush current as in the non-defective product, and then the current decreases. However, in this waveform, after the peak 11 due to the inrush current, a discharge phenomenon due to creeping discharge which is not present in the waveform of the normal product is observed.
- the reference waveform is set based on the charging current waveform obtained from at least 100 non-defective products.
- the average waveform of the charging current waveform may be used as the reference waveform.
- a reference waveform for determining the upper limit may be determined based on the maximum waveform, and a reference waveform for determining the lower limit may be determined based on the minimum waveform. Then, the reference current value (the upper limit of the allowable range) is calculated from the current value on the reference waveform based on a predetermined relational expression.
- FIG. 5 shows an example of the relationship between the reference waveform and the reference current value 13.
- a reference value 14 is set below the reference waveform based on the reference waveform. If a current value below the reference value 14 is detected, it is necessary to consider the possibility that the inspection itself was defective. An abnormally low current value occurs, for example, when there is a poor electrical contact between the terminal of the inspection device and the electrode body.
- a reference current value (upper limit) and a lower reference value (lower limit) higher than the current based on the current when a voltage is applied to a normal secondary battery precursor When a current value higher than the upper limit is measured, the precursor is determined to be defective, and when a current value lower than the lower limit is set, the precursor is subject to retest or defective. Is determined.
- the reference value that defines the lower limit of the current value is also a value that is lower than the current value on the reference waveform by a predetermined percentage or by a predetermined amount (for example, the difference between the minimum value and the average value from the average value of a normal waveform) (A value that is lower by a factor of 2 to 10 times).
- the value to be compared does not necessarily need to be set based on the charging current waveform obtained from a good product.
- a predetermined time period T 2 _ TJ from start of the application of voltage until the current value becomes constant, when the current value exceeds a predetermined value determined Me pre is measured
- a predetermined value (I ⁇ ) set as a function of time may be used as a reference value instead of IJ.
- This inspection method uses a charging current waveform. Although the accuracy is lower than the method, it is easy to implement when the charging current waveform of a good product can be predicted.
- the first waveform is This is a non-defective waveform as exemplified in FIG. As shown in FIG. 6, in this waveform, a behavior associated with an increase in the current is observed immediately after the voltage is applied, but a constant current is observed during the voltage increase, and the waveform is continued until the end of the voltage application.
- the second waveform is the waveform of the internal short-circuit product illustrated in FIG. As shown in FIG. 7, in this case, a large current continues to flow from the start of voltage application to the end of measurement.
- the third waveform is a waveform of a potential short-circuited product that may be internally short-circuited in the future, as illustrated in FIG.
- a discharge phenomenon due to creeping discharge which is not present in the waveform of the normal product is observed while the constant current is flowing. In most cases, this discharge is short-lived, and the current converges again to a value similar to that of a good product.
- the reference waveform based on a charging current waveform obtained from at least 100 non-defective products.
- the average waveform of the charging current waveform may be adopted as the reference waveform.
- the reference waveform for determining the upper limit may be determined based on the maximum waveform, and the reference waveform for determining the lower limit may be determined based on the minimum waveform. Then, the reference current value (the upper limit of the allowable range) is calculated from the current value of the reference waveform based on a predetermined relational expression.
- a value higher than the current value on the reference waveform by a predetermined ratio or a predetermined amount (for example, higher than the average value of a normal waveform by 2 to 10 times the difference between the maximum value and the average value) Value) may be used as the reference current value.
- FIGS. 9 to 11 show an example of a voltage waveform observed on a non-defective electrode body.
- FIG. 10 shows an example of a voltage waveform observed at an electrode body that is internally short-circuited.
- FIG. 11 shows an example of the voltage waveform observed at the electrode body that may short-circuit internally in the future.
- a temporary voltage drop 16 is observed as shown in Figure 11. Therefore, the same effect as the method of monitoring the current waveform can be obtained in the method of monitoring the voltage waveform.
- the differential change of the voltage with respect to time may be measured based on the resolution of the oscilloscope.
- Embodiment 2 describes an example of the method of the present invention for manufacturing a secondary battery.
- the secondary battery manufactured by the present invention is, for example, a nickel hydride battery, a lithium ion secondary battery, or the like. Among them, a lithium ion secondary battery having a thin separator (for example, 25 Aim or less) is particularly suitable.
- the production method of the present invention is based on the fact that the secondary battery precursor before contact with the electrolytic solution The feature is that it is inspected by the light inspection method. A well-known manufacturing method can be applied to other manufacturing steps. Known members can be applied to the members constituting the battery. Hereinafter, an example of manufacturing a lithium ion secondary battery will be described.
- a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrodes is manufactured.
- the secondary battery precursor can be formed by winding a positive electrode and a negative electrode with a separator interposed therebetween. Further, the secondary battery precursor can also be formed by alternately stacking a plurality of positive electrodes and a plurality of negative electrodes with a separator interposed therebetween.
- Known materials can be applied to the positive electrode, the negative electrode, and the separator. When the thickness of the separator is 25 ⁇ m or less, the effect of the present invention is particularly large.
- the secondary battery precursor is inspected by the inspection method of Embodiment 1 to detect a defective product. This inspection may be performed before the secondary battery precursor is brought into contact with the electrolytic solution.
- the secondary battery precursor determined to be good in the inspection is placed in the battery case together with the non-aqueous electrolyte. Then, seal the battery case. Thus, a lithium ion secondary battery is manufactured.
- the inspection of the secondary battery precursor may be performed after storing the secondary battery precursor in the battery case and before injecting the electrolytic solution into the battery case.
- FIG. 14 schematically shows a cross-sectional view of an example of the lithium ion secondary battery manufactured by the above method.
- the lithium ion secondary battery 30 has a positive electrode 31, a positive electrode lead 32, a negative electrode 33, a negative electrode lead 34, a separator 35, an upper insulating plate 36, and a lower insulating plate 37.
- the positive electrode 31 and the negative electrode 33 are spirally wound via the separator 35. This constitutes the electrode group (battery element). This electrode group is stored in a battery case 38.
- a positive electrode lead 32 is connected to the positive electrode 31, and the lid 40, which also functions as a positive electrode terminal, and the positive electrode 31 are electrically connected by the positive electrode lead 32.
- the negative electrode 33 is connected to a negative electrode lead 34.
- the battery case 38 also serving as the negative electrode terminal and the negative electrode 33 are electrically connected by the negative electrode lead 34. Battery case 38 is sealed with insulating gasket 39 and lid 40.
- the positive electrode 31 and the negative electrode 33 are both electrode plates that reversibly occlude and release lithium.
- the constituent members of the lithium ion secondary battery 30 conventionally used or proposed members can be applied.
- the positive electrode active material it is possible to use a composite oxide containing lithium (for example, L i C O_ ⁇ 2).
- the negative electrode active material for example, a carbonaceous material or an alloy material capable of inserting and extracting lithium can be used.
- the non-aqueous electrolyte an electrolyte obtained by dissolving a lithium salt (eg, LiPF 6 ) in a non-aqueous solvent (eg, ethylene carbonate or ethyl methyl carbonate) can be used. According to the method, a highly reliable secondary battery can be manufactured with high productivity.
- the battery described in Embodiment 2 is an example of a secondary battery manufactured by the method of the present invention, and the present invention is not limited to this.
- an electrode body (secondary battery precursor) for a secondary battery was prepared.
- the positive electrode plate 51 was produced by applying a paste containing lithium cobaltate (main component) and acetylene black to both surfaces of an aluminum foil. At this time, paste is not applied to part of the aluminum foil, Was welded.
- the negative electrode plate 52 was produced by applying a paste containing graphite as a main component to both surfaces of the copper foil. At this time, a lead for current collection was welded without applying paste to part of the copper foil.
- the positive electrode plate 51 and the negative electrode plate 52 were laminated with a separator 53 interposed therebetween, and further wound to obtain an electrode assembly.
- a separator 53 a porous film (thickness: 20 ⁇ ) made of polyethylene was used.
- the structure of this electrode body is schematically shown in FIG. Although the structure in FIG. 13 is different from the actual structure, the positive electrode plate 51 and the negative electrode plate 52 face each other with the separator 53 interposed therebetween.
- One electrode body is an electrode body manufactured using a separator cut out by a length of 5 mm.
- the other electrode body was manufactured by mixing five stainless steel (SUS) abrasive powders having a particle diameter of 45 ⁇ or more and less than 75 ⁇ m between the positive electrode plate 51 and the separator 53.
- Other electrode bodies were produced by mixing five stainless steel polishing powders having a particle size of 45 ⁇ m or more and less than 75 ⁇ m between the negative electrode plate 52 and the separator 53.
- the charging current waveform was measured using an inspection device having a circuit similar to that of FIG. A 100 k ⁇ resistor was used as the resistor 3, and an I WAT S U T S 4 4 6 2 was used as the oscilloscope 5.
- the DC voltage output from the power supply was 250 V, 500 V, 75 V, 1000 V, 125 V, or 150 V.
- the voltage application time that is, the time for monitoring the charging current waveform in order to determine a defect was set to 0.5 seconds, and the measurement interval was set to 50 ⁇ s. With this electrode body, charging is completed after 0.5 seconds at the latest, and the measured current becomes almost constant at least 0.5 seconds if it is a normal non-defective product.
- the charging current waveform for 500 non-defective electrode bodies We measured and found the average waveform, and selected the maximum and minimum waveforms respectively. Then, a waveform larger than the maximum waveform by 20% of the difference between the average waveform and the maximum waveform was set as a reference waveform defining the upper limit value. Similarly, a waveform smaller than the minimum waveform by 20% of the difference between the average waveform and the minimum waveform was set as the reference waveform for defining the lower limit.
- the range between the upper limit and the lower limit was defined as the allowable range for the measured charging current waveform, that is, the range of non-defective products.
- the reference waveform was set individually for each voltage value. However, assuming that the applied voltage was 1500 V, an abnormal waveform due to arc discharge was observed for a non-defective product (normal product), so that a reference waveform could not be set. During the measurement for 0.5 seconds, the electrode body in which the current value outside the permissible range was measured even once was judged as defective, and the electrode body in which no abnormal current value was measured was judged as non-defective. The inspection was performed at a temperature 30 ° C lower than the dew point. Table 1 shows the inspection results.
- no electrode body detected a current value lower than the lower limit.
- the applied voltage was 1500 V
- all the electrodes including the normal product showed an abnormal waveform, and all the electrodes were determined to be defective.
- the present invention is applicable to a method for inspecting a precursor (electrode group) of a secondary battery and an inspection apparatus thereof, and a method for manufacturing a secondary battery.
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- General Physics & Mathematics (AREA)
- Fuel Cell (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003255035A AU2003255035A1 (en) | 2002-08-29 | 2003-08-14 | Method for testing precursor of secondary cell, its testing instrument, and method for manufacturing secondary cell using the method |
US10/523,177 US7239147B2 (en) | 2002-08-29 | 2003-08-14 | Method and device for inspecting secondary battery precursor and method for manufacturing secondary battery using the inspection method |
EP03791215A EP1542306A4 (en) | 2002-08-29 | 2003-08-14 | METHOD OF TESTING A SECONDARY CELL PRECURSOR, TEST INSTRUMENT AND METHOD OF MANUFACTURING SECONDARY CELL USING THE SAME |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002251928 | 2002-08-29 | ||
JP2002-251928 | 2002-08-29 |
Publications (1)
Publication Number | Publication Date |
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WO2004021498A1 true WO2004021498A1 (ja) | 2004-03-11 |
Family
ID=31972715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010361 WO2004021498A1 (ja) | 2002-08-29 | 2003-08-14 | 二次電池前駆体の検査方法およびその検査装置ならびにその方法を用いた二次電池の製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7239147B2 (ja) |
EP (1) | EP1542306A4 (ja) |
KR (1) | KR100701525B1 (ja) |
CN (2) | CN101123316A (ja) |
AU (1) | AU2003255035A1 (ja) |
WO (1) | WO2004021498A1 (ja) |
Cited By (1)
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WO2011040446A1 (ja) * | 2009-09-30 | 2011-04-07 | 大日本印刷株式会社 | 絶縁性不良検査装置、及びそれを用いた絶縁性不良検査方法、電気化学セルの製造方法 |
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US7527894B2 (en) * | 2006-09-19 | 2009-05-05 | Caleb Technology Corporation | Identifying defective electrodes in lithium-ion polymer batteries |
JP5148579B2 (ja) * | 2009-09-29 | 2013-02-20 | 三菱重工業株式会社 | 二次電池異常予見システム |
JP5945405B2 (ja) * | 2011-12-05 | 2016-07-05 | オートモーティブエナジーサプライ株式会社 | リチウムイオン二次電池の製造方法 |
JP5692183B2 (ja) * | 2012-07-27 | 2015-04-01 | トヨタ自動車株式会社 | 二次電池の出荷前検査方法 |
JP5724980B2 (ja) * | 2012-09-26 | 2015-05-27 | トヨタ自動車株式会社 | 密閉型電池の製造方法、検査装置、及び検査プログラム |
JP5927623B1 (ja) * | 2015-02-03 | 2016-06-01 | 株式会社ジェイ・イー・ティ | 蓄電装置の製造方法、構造体の検査装置 |
DE102015218326A1 (de) * | 2015-09-24 | 2017-03-30 | Robert Bosch Gmbh | Verfahren zum Überwachen einer Batterie |
KR101755910B1 (ko) * | 2015-12-02 | 2017-07-07 | 현대자동차주식회사 | 친환경 차량의 절연파괴 검출장치 및 방법 |
CN106772069B (zh) * | 2016-11-30 | 2020-05-05 | 宁德时代新能源科技股份有限公司 | 一种电池短路的检测方法和装置 |
TWI621866B (zh) * | 2017-05-05 | 2018-04-21 | 致茂電子股份有限公司 | 電池芯半成品測試方法 |
CN108802617B (zh) * | 2017-05-05 | 2020-12-01 | 致茂电子(苏州)有限公司 | 电池芯半成品测试方法 |
JP6874544B2 (ja) * | 2017-06-07 | 2021-05-19 | 株式会社デンソー | 監視装置 |
JP6885236B2 (ja) * | 2017-07-10 | 2021-06-09 | トヨタ自動車株式会社 | 蓄電デバイスの短絡検査方法及び蓄電デバイスの製造方法 |
CN109709491A (zh) * | 2017-10-26 | 2019-05-03 | 宁德新能源科技有限公司 | 问题电芯的判别方法 |
CN108279386A (zh) * | 2018-02-05 | 2018-07-13 | 惠州亿纬锂能股份有限公司 | 一种电芯筛选方法 |
KR102043645B1 (ko) * | 2018-04-03 | 2019-12-02 | 주식회사 엘지화학 | 이차전지의 불량 검출을 위한 저전압 발현 수준 연산 시스템 및 검출 방법 |
US11327121B2 (en) * | 2019-04-03 | 2022-05-10 | Transportation Ip Holdings, Llc | Deviation detection system for energy storage system |
KR20220114908A (ko) * | 2021-02-09 | 2022-08-17 | 주식회사 엘지에너지솔루션 | 전해액 주액 전의 전극 조립체 불량 검사장치 및 불량 검사방법 |
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JP2000028690A (ja) * | 1998-07-13 | 2000-01-28 | Mitsubishi Chemicals Corp | 二次電池の短絡検査方法および当該検査方法を包含する二次電池の製造方法 |
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2003
- 2003-08-14 KR KR1020057003363A patent/KR100701525B1/ko active IP Right Grant
- 2003-08-14 CN CNA2007100917595A patent/CN101123316A/zh active Pending
- 2003-08-14 US US10/523,177 patent/US7239147B2/en not_active Expired - Lifetime
- 2003-08-14 EP EP03791215A patent/EP1542306A4/en not_active Withdrawn
- 2003-08-14 WO PCT/JP2003/010361 patent/WO2004021498A1/ja not_active Application Discontinuation
- 2003-08-14 CN CNB038207052A patent/CN100370646C/zh not_active Expired - Lifetime
- 2003-08-14 AU AU2003255035A patent/AU2003255035A1/en not_active Abandoned
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JP2000195565A (ja) * | 1998-12-25 | 2000-07-14 | Sanyo Electric Co Ltd | 二次電池の検査方法 |
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Cited By (4)
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WO2011040446A1 (ja) * | 2009-09-30 | 2011-04-07 | 大日本印刷株式会社 | 絶縁性不良検査装置、及びそれを用いた絶縁性不良検査方法、電気化学セルの製造方法 |
JP5699337B2 (ja) * | 2009-09-30 | 2015-04-08 | 大日本印刷株式会社 | 絶縁性不良検査装置、及びそれを用いた絶縁性不良検査方法、電気化学セルの製造方法 |
US9076601B2 (en) | 2009-09-30 | 2015-07-07 | Dai Nippon Printing Co., Ltd. | Insulation failure inspecting apparatus, insulation failure inspecting method using same, and method for manufacturing electrochemical cell |
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Also Published As
Publication number | Publication date |
---|---|
EP1542306A4 (en) | 2007-08-08 |
EP1542306A1 (en) | 2005-06-15 |
CN101123316A (zh) | 2008-02-13 |
US7239147B2 (en) | 2007-07-03 |
AU2003255035A1 (en) | 2004-03-19 |
KR100701525B1 (ko) | 2007-03-29 |
KR20050057001A (ko) | 2005-06-16 |
CN1679199A (zh) | 2005-10-05 |
CN100370646C (zh) | 2008-02-20 |
US20050242820A1 (en) | 2005-11-03 |
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