JP2012160301A - Measuring method and measuring apparatus of electrode sheet for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring method and a measuring apparatus of an electrode sheet for a battery capable of measuring each measurement region in the region to be measured of the electrode sheet for a battery.SOLUTION: The measurement method and the measuring apparatus of the electrode sheet for a battery is the measurement method and the measuring apparatus of the electrode sheet for a battery which measure the electrode sheet formed by laminating an electrode layer and an insulation layer in this order, and which can measure an electrostatic capacity of the insulation layer by dividing region to be measured of the electrode sheet so that each of the divided measurement region can be measured by means of the measured electrostatic capacity.

Description

  The present invention relates to a technical field of a measuring method and a measuring device for a battery electrode sheet using a capacitance such as a lithium battery.

  As a method of measuring this type of battery electrode sheet, in a secondary battery having an electrode group having a structure in which a separator is placed between a positive electrode and a negative electrode and wound, the capacitance of the electrode group is measured after the battery is assembled. A measuring method is disclosed in Patent Document 1.

JP 11-345632 A

  However, this type of battery electrode sheet measurement method has a problem in that measurement is not possible for each measurement region of the electrode group because measurement is performed on the entire measurement region of the electrode group.

  This invention is made in view of the said problem, and provides the measuring method and measuring apparatus of the battery electrode sheet which can judge the quality for every area | region of the measurement area | region of the battery electrode sheet. Let it be an issue.

In order to solve the above-described problem, the battery electrode sheet measurement method according to the present invention is a battery electrode sheet measurement method for measuring an electrode sheet laminated in the order of an electrode layer and an insulating layer,
The measurement area of the electrode sheet is divided and the capacitance of the insulating layer is measured.

  Here, the electrode sheet means a sheet in which an electrode layer and an insulating layer are laminated in this order. An electrode layer refers to a layer including an active material layer. The electrode layer may be the active material layer itself, or may be a laminate of the current collector and the active material layer. An insulating layer means a layer that is electrically insulated. Examples of the insulating layer include a separator, a porous sheet, a fibrous sheet, and a solid electrolyte layer. Examples of the separator include a polyolefin microporous film represented by polyethylene and polypropylene.

  The measurement area means an area where the electrode sheet is measured. Specifically, in the electrode sheet, it means a region where at least one of the electrode layer and the insulating layer is present.

  The electrostatic capacity means the electrostatic capacity between two points in the stacking direction of the electrode sheets. In general, capacitance refers to the amount of electricity required to increase the voltage of an insulated conductor or the potential difference between both poles of a capacitor by a unit amount. Therefore, the capacitance in the present invention reflects the state of the insulating layer. For example, when the physical property of the insulating layer, in other words, the dielectric constant changes, the capacitance also changes according to the dielectric constant of the insulating layer. Further, when the dielectric constant ε of the insulating layer and the area S formed by the measurement terminal can be regarded as constant, the capacitance C corresponding to the thickness d of the insulating layer can be obtained from the formula C = εS / d. That is, by measuring the capacitance, a value corresponding to the state of the insulating layer can be obtained, and the battery electrode sheet can be measured.

  Examples of the division of the measurement area include dividing the measurement terminal into a plurality of parts by an insulating member and scanning the measurement terminal for each measurement area to be divided and measured.

  For example, the capacitance can be measured by bringing a measurement terminal into contact with the electrode sheet and measuring the electrode sheet without contacting the electrode sheet.

  The measured electrode sheet is assembled as a battery, for example. Here, if an electrode sheet that is determined to be defective by measurement, that is, a defective electrode sheet is assembled as a battery, problems such as deterioration of battery performance and internal short circuit may occur unless some measures are taken. Moreover, in order to measure an electrode sheet, it is inefficient to measure the assembled battery. And it is difficult to specify the cause of the failure, for example, the malfunction of the equipment, simply by measuring the entire measurement region of the electrode sheet.

  However, according to the method for measuring a battery electrode sheet according to the present invention, it is possible to determine the quality of each measurement region of the electrode sheet. In other words, each of the divided regions can be measured in a certain divided region of the measurement region of the electrode sheet. Therefore, for example, do not send a defective electrode sheet to the next manufacturing process, optimally control the manufacturing conditions of the electrode sheet manufacturing apparatus, identify the cause of the electrode sheet failure such as equipment failure, and the electrode sheet It becomes easy to remove only the defective portion, and the electrode sheet can be efficiently produced.

  The battery electrode sheet measurement method further includes a calculation step of calculating the thickness of the insulating layer from the measured capacitance.

  According to this aspect, the thickness of the insulating layer can be calculated from the measured capacitance. The calculation of the thickness of the insulating layer is, for example, a method of calculating the thickness of the insulating layer from the capacitance equation, and the correlation between the capacitance value and the thickness of the insulating layer in advance, and the correlation of the insulating layer from the correlation. The method etc. which calculate thickness can be mentioned. Then, the quality of each of the divided measurement regions can be determined from the calculated thickness of the insulating layer.

  The electrode sheet measured as described above is assembled as a battery, for example. If the thickness of the insulating layer is extremely thin, there is a possibility that the positive electrode or the negative electrode will break through the insulating layer due to restraint during battery assembly or expansion / contraction of the electrode layer during charge / discharge, and a short circuit may occur. Can be considered. Moreover, when the thickness of the insulating layer is extremely thick, there is a possibility that the movement of lithium ions is hindered and the battery performance is lowered.

  However, in one aspect of the method for measuring a battery electrode sheet according to the present invention, the thickness of the insulating layer can be calculated for each divided measurement region. Therefore, for example, the quality of the battery electrode sheet can be determined, and a short circuit or a decrease in battery performance can be prevented.

  In another aspect of the method for measuring a battery electrode sheet according to the present invention, the insulating layer is a solid electrolyte layer.

  According to this aspect, the electrode sheet provided with the solid electrolyte layer can be measured.

  In order to solve the above-described problems, a battery electrode sheet measuring apparatus according to the present invention is a battery electrode sheet measuring apparatus that measures an electrode sheet laminated in the order of an electrode layer and an insulating layer, A first measurement terminal disposed on the insulating layer of the sheet and divided into a plurality of parts, and a second measurement terminal disposed on the electrode layer with the electrode sheet interposed between the first measurement terminal and the first measurement terminal. Prepare.

  Here, the electrode sheet means a sheet in which an electrode layer and an insulating layer are laminated in this order. An electrode layer refers to a layer including an active material layer. The electrode layer may be the active material layer itself, or may be a laminate of the current collector and the active material layer. An insulating layer means a layer that is electrically insulated. Examples of the insulating layer include a separator, a porous sheet, a fibrous sheet, and a solid electrolyte layer. Examples of the separator include a polyolefin microporous film represented by polyethylene and polypropylene.

  The electrostatic capacity means the electrostatic capacity between two points in the stacking direction of the electrode sheets. In general, capacitance refers to the amount of electricity required to increase the voltage of an insulated conductor or the potential difference between both poles of a capacitor by a unit amount. Therefore, the capacitance in the present invention reflects the state of the insulating layer. For example, when the physical property of the insulating layer, in other words, the dielectric constant changes, the capacitance also changes according to the dielectric constant of the insulating layer. Further, when the dielectric constant ε of the insulating layer and the area S formed by the measurement terminal can be regarded as constant, the capacitance C corresponding to the thickness d of the insulating layer can be obtained from the formula C = εS / d. That is, by measuring the capacitance, a value corresponding to the state of the insulating layer can be obtained, and the battery electrode sheet can be measured.

  The measurement device means a device that includes a first measurement terminal and a second measurement terminal and measures the capacitance of the insulating layer of the electrode sheet. The measurement device is a device including a processor, a memory, and the like, for example.

  A 1st measurement terminal and a 2nd measurement terminal mean the terminal which opposes an electrode sheet and measures the electrostatic capacitance of the insulating layer of an electrode sheet. The first measurement terminal is disposed on the insulating layer of the electrode sheet. The first measurement terminal is made of, for example, a conductive material in which a surface facing the insulating layer is divided into a plurality of parts by an insulating material. The second measurement terminal is disposed on the electrode layer with the electrode sheet sandwiched from the first measurement terminal. The first measurement terminal and the second measurement terminal may be in contact with the electrode sheet or may be non-contact. When contacting the electrode sheet, for example, it is also possible to measure the state in which pressure is applied to the electrode sheet by contacting the electrode sheet. In the case of non-contact with the electrode sheet, for example, measurement can be performed without causing adhesion of foreign matter or scratches on the surface of the insulating layer.

  The measured electrode sheet is assembled as a battery, for example. Here, if an electrode sheet that is determined to be defective by measurement, that is, a defective electrode sheet is assembled as a battery, problems such as deterioration of battery performance and internal short circuit may occur unless some measures are taken. Moreover, in order to measure an electrode sheet, it is inefficient to measure the assembled battery. And it is difficult to specify the cause of the failure, for example, the malfunction of the equipment, simply by measuring the entire measurement region of the electrode sheet.

  However, according to the method for measuring a battery electrode sheet according to the present invention, it is possible to determine the quality of each measurement region of the electrode sheet. In other words, each of the divided regions can be measured in a certain divided region of the measurement region of the electrode sheet. Therefore, for example, do not send a defective electrode sheet to the next manufacturing process, optimally control the manufacturing conditions of the electrode sheet manufacturing apparatus, identify the cause of the electrode sheet failure such as equipment failure, and the electrode sheet It becomes easy to remove only the defective portion, and the electrode sheet can be efficiently produced.

  In one aspect of the battery electrode sheet measuring apparatus according to the present invention, the battery electrode sheet measuring apparatus further comprises a calculating means for calculating the thickness of the insulating layer from the measured capacitance. Prepare.

  According to this aspect, the thickness of the insulating layer can be calculated from the measured capacitance. The calculating means means for calculating the thickness of the insulating layer based on the measured capacitance. The calculation means is an apparatus including a processor, a memory, and the like, for example. The calculating means can calculate the thickness of the insulating layer for each capacitance measured by the measuring means. Note that the processor and memory used for measurement and the processor and memory used by the calculation means may be shared.

  The electrode sheet measured as described above is assembled as a battery, for example. If the thickness of the insulating layer is extremely thin, there is a possibility that the positive electrode or the negative electrode will break through the insulating layer due to restraint during battery assembly or expansion / contraction of the electrode layer during charge / discharge, and a short circuit may occur. Can be considered. Moreover, when the thickness of the insulating layer is extremely thick, there is a possibility that the movement of lithium ions is hindered and the battery performance is lowered.

  However, in one aspect of the method for measuring a battery electrode sheet according to the present invention, the thickness of the insulating layer can be calculated for each divided measurement region. Therefore, for example, the quality of the battery electrode sheet can be determined, and a short circuit or a decrease in battery performance can be prevented.

  In another aspect of the battery electrode sheet measuring apparatus according to the present invention, the insulating layer is a solid electrolyte layer.

  According to this aspect, the electrode sheet provided with the solid electrolyte layer can be measured.

  In this invention, it becomes possible to provide the measuring method and measuring apparatus of the battery electrode sheet which can measure for every area | region of the measurement area | region of the battery electrode sheet.

1 is a perspective view conceptually showing a first embodiment. It is a top view of a 1st embodiment. It is A-A 'sectional drawing of a 1st embodiment. It is a flowchart which expresses the inspection method of a 1st embodiment notionally. It is a perspective view showing a 2nd embodiment notionally. It is a top view of a 2nd embodiment. It is B-B 'sectional drawing of 2nd Embodiment. It is a flowchart which expresses the inspection method of a 2nd embodiment notionally.

  Hereinafter, the measuring method and measuring apparatus of the battery electrode sheet of the present invention will be described in detail.

  Hereinafter, a first embodiment of the present invention will be described in detail.

  With reference to FIGS. 1-4, the measuring method and measuring apparatus of the battery electrode sheet which concern on 1st real form are demonstrated. FIG. 1 is a perspective view showing an external appearance of the measuring device 30, and FIG. 2 is a plan view of the first measuring terminal 20 portion as viewed from above. FIG. 3 is a cross-sectional view taken along the line A-A ′ of FIG. 2, that is, a cross section obtained by cutting a part of the measuring device 30 along a vertical plane. The measuring device 30 further includes a determination device 35, and is configured as an inspection device 1000 that inspects the battery electrode sheet as a whole. FIG. 4 is a flowchart conceptually showing the inspection method of the inspection apparatus 1000.

  In FIG.1 and FIG.3, the electrode sheet 55 which the measuring apparatus 30 measures is shown in figure. The electrode sheet 55 includes a solid electrolyte layer 50, an active material layer 45, and a current collector 40, and is laminated in this order.

Examples of the material used for the solid electrolyte layer 50 include a sulfide-based solid electrolyte and an oxide-based solid electrolyte. The sulfide-based solid electrolyte is not particularly limited as long as it contains a sulfur component and has ionic conductivity. Include, for _{example, Li 2 S-P 2 S} 5, 70Li 2 S-30P 2 S 5, 80Li 2 S-20P 2 S 5, Li 2 S-SiS 2, and _{LiGe 0.25} P _0.75 S _4, etc. be able to. The oxide-based solid electrolyte, for _{example, LiPON, Li 1 + X Al} X Ti 2-X (PO 4) 3, Li 1 + X Al X Ge 2-X (PO 4) 3, Li 7 La 3 Zr 2 O 12 and, it can be mentioned li ₅ La ₃ Nb ₂ O ₁₂ and the like. The inorganic solid electrolyte 10 can be used alone or in combination of two or more.

  The material of the current collector 40 is not particularly limited as long as it has conductivity. For example, SUS, aluminum, nickel, iron, titanium, copper, carbon, etc. can be mentioned. The current collector of the positive electrode is preferably a SUS foil and an aluminum foil, and more preferably an aluminum foil. The current collector of the negative electrode is preferably a SUS foil and a copper foil, and more preferably a copper foil.

  Examples of the active material layer 45 include a positive electrode active material layer and a negative electrode active material layer.

As the material used for the positive electrode active material layer, the same materials as those used for various existing lithium batteries can be used. Examples of the positive electrode active material include a sulfide-based active material and an oxide-based active material. Examples of the sulfide-based active material include TiS ₂ , MoS ₂ , FeS, FeS ₂ , CuS, and NiS ₂ . Examples of the oxide-based active material include Bi ₂ O ₃ , Bi ₂ Pb ₂ O ₅ , CuO, V ₆ O ₁₃ , LiCoO ₂ , LiCrO ₂ , LiNiO ₂ , LiMn ₂ O ₄ , Li ₂ NiMn ₃ O ₈ , Li ₃ NiMnCoO ₆ , LiMgMn ₃ O ₈ , LiNiGe ₃ O ₈ , LiNiVO ₂ , LiCoVO ₂ , LiFePO ₄ , and LiCoPO ₄ can be exemplified. A positive electrode active material can be used individually by 1 type, or can be used in combination of 2 or more type.

  The positive electrode active material layer includes a conductive material, an ion conductivity improving material, a binder material, and the like as necessary.

  Examples of the conductive material include carbon fiber, ketjen black, and acetylene black. One type of conductive material can be used alone, or two or more types can be used in combination.

  As the ion conductive material, the same materials as those used in various existing lithium batteries can be used. Examples of the ion conductive material include the aforementioned sulfide-based solid electrolyte and oxide-based solid electrolyte. An ion conductive material can be used individually by 1 type, or can be used in combination of 2 or more types.

  Examples of the binder material include synthetic rubbers such as styrene butadiene rubber, fluorine rubber, and ethylene propylene diene, and polymer materials such as polyvinylidene fluoride. Binder materials can be used alone or in combination of two or more.

As the material used for the negative electrode active material layer, the same materials as those used for various existing lithium batteries can be used. Examples of the negative electrode active material include carbon materials, Li metals, Li alloys, oxide materials, and nitride materials. Examples of the carbon-based material include graphite, carbon nanotube, mesocarbon microbead, highly oriented graphite, hard carbon, and soft carbon. Examples of the Li alloy include an alloy of Li and Mg, Ca, Al, Si, Ge, Sn, Pb, As, Sb, Bi, Ag, Au, Zn, Cd, and Hg. Examples of the oxide material include Nb ₂ O ₅ , TiO ₂ , Li ₄ Ti ₅ O ₁₂ , WO ₂ , and Fe ₂ O ₃ . As the nitride material, for _{example, Li 3-X Co X N} , Li 3-X Ni X N, can be exemplified _{Li 3-X} Cu X N and the like. A negative electrode active material can be used individually by 1 type, or can be used in combination of 2 or more type.

  The negative electrode active material layer includes a conductive material, an ion conductivity improving material, a binder material, and the like as necessary. As the conductive material, the ion conductivity improving material, the binder material, and the like, the same materials as those used for the positive electrode active material layer described above can be used.

  The measurement device 30 includes a first measurement terminal 20 and a second measurement terminal 25. The measuring device 30 measures the capacitance of the solid electrolyte layer 50 of the electrode sheet 55.

  The first measurement terminal 20 is disposed to face the solid electrolyte layer 50 of the electrode sheet 55. The first measurement terminal 20 is not in contact with the solid electrolyte layer 50. The first measurement terminal 20 includes the conductive portion 10 and the insulating portion 15 on the surface facing the solid electrolyte layer 50.

  The material of the electroconductive part 10 will not be specifically limited if it has electroconductivity. Examples of the material of the conductive portion 10 include SUS, aluminum, nickel, iron, titanium, copper, and carbon. The shape of the electroconductive part 10 will not be specifically limited if an electrostatic capacitance can be measured. Examples of the shape of the conductive portion 10 include a circle, an ellipse, a triangle, a quadrangle, and a hexagon.

  The material of the insulating part 15 is not particularly limited as long as it has insulating properties. Examples of the material of the insulating portion 15 include resin, ceramics, rubber, and the like. The insulating part 15 divides the conductive part 10 into a plurality of parts.

  With the conductive portion 10 and the insulating portion 15 of the first measurement terminal 20, the measuring device 30 can measure the capacitance of the solid electrolyte layer 50 for each measurement region of the electrode sheet 55.

  The second measurement terminal 25 is disposed to face the current collector 40 of the electrode sheet 55. The second measurement terminal 40 is in contact with the current collector 40. The second measuring terminal 25 has a conductive surface facing the current collector 40. The material of the second measurement terminal 25 is not particularly limited as long as it has conductivity. Examples of the material of the second measurement terminal 25 include SUS, aluminum, nickel, iron, titanium, copper, and carbon.

  The determination device 35 determines the quality of the solid electrolyte layer 50 based on the measured capacitance. The determination device 35 is a device including a processor, a memory, and the like. The determination device 35 can determine the quality of the solid electrolyte layer 50 for each capacitance measured by the measurement device 30.

  The measuring method of the measuring apparatus 30 configured as described above and the determining method of the determining method 30, that is, the inspecting method of the inspecting apparatus 1000 will be described step by step with reference to FIG.

  First, in the measurement process, the capacitance of the solid electrolyte layer 50 is measured by the measurement device 30 (step S10). Here, electricity flows through the current collector 40 and the active material layer 45. Therefore, the space between the solid electrolyte layer 50 and the first measurement terminal 20 through the second measurement terminal 25 through which electricity flows, the current collector 40, the active material layer 45, and the conductive part 20 of the first measurement terminal 20. The capacitance values of the portion and the solid electrolyte layer 50 are measured. That is, since the electrostatic capacity can be measured for each conductive part 10, it is possible to determine pass / fail for each measurement region of the electrode sheet 55. In other words, it is possible to determine the quality of each of the divided areas in the divided area of the measurement area of the electrode sheet 55. Further, by measuring the capacitance, it is possible to determine the quality of the inside of the solid electrolyte layer 50 that cannot be directly measured, the surface in contact with the active material layer 45, or the like.

  And in a determination process, the quality of the solid electrolyte layer 50 is determined based on the measured electrostatic capacitance (step S20). The determination is performed by the determination device 35, and the quality of the solid electrolyte layer 50 is determined for each capacitance measured in step S10. Examples of the determination method include a method of comparing a predetermined electrostatic capacity that is a standard for quality and a measured electrostatic capacity.

  Here, when it is determined that the solid electrolyte layer 50 is defective, the defective portion is fed back in the feedback process (step S30). By feedback, for example, do not send a defective electrode sheet 55 to the next manufacturing process, optimally control the manufacturing conditions of the manufacturing apparatus of the electrode sheet 55, and identify the cause of the defect of the electrode sheet 55 such as equipment failure Further, it becomes easy to remove only defective portions of the electrode sheet 55, and the electrode sheet 55 can be produced efficiently. Step S30 may be included in step S20.

  On the other hand, when the solid electrolyte layer 50 is determined to be good, the inspection is terminated.

  Hereinafter, the second embodiment of the present invention will be described in detail.

  With reference to FIGS. 5-8, the measuring method and measuring apparatus of the battery electrode sheet which concern on 2nd real form are demonstrated. FIG. 5 is a perspective view showing the external appearance of the measuring device 31, and FIG. 6 is a plan view of the first measurement terminal 21 portion as viewed from above. A plan view of the second measurement terminal 26 viewed from below is the same as FIG. FIG. 7 is a cross-sectional view taken along the line B-B ′ of FIG. 6, that is, a cross section obtained by cutting a part of the measuring device 31 along one vertical plane. The measurement device 31 further includes a calculation device 61 and a determination device 35, and is configured as an inspection device 1100 that inspects the battery electrode sheet as a whole. FIG. 8 is a flowchart conceptually showing the inspection method of the inspection apparatus 1100.

  In FIG.1 and FIG.3, the electrode sheet 56 which the measuring apparatus 31 measures is shown in figure. The electrode sheet 56 includes a solid electrolyte layer 51, an active material layer 46, and a current collector 41, and is laminated in this order. The electrode sheet 56 can be the same as the electrode sheet 55 described above. The materials for the solid electrolyte layer 51, the active material layer 46, and the current collector 41 can also be the same as the materials for the solid electrolyte layer 50, the active material layer 45, and the current collector 40 described above. .

  The measurement device 31 includes a first measurement terminal 21 and a second measurement terminal 26. The measuring device 31 measures the capacitance of the solid electrolyte layer 51 of the electrode sheet 56.

  The first measurement terminal 21 is disposed to face the solid electrolyte layer 51 of the electrode sheet 56. The first measurement terminal 21 is in contact with the solid electrolyte layer 51. The first measurement terminal 21 includes the conductive portion 11 and the insulating portion 16 on the surface facing the solid electrolyte layer 51. The first measurement terminal 21 is configured such that the conductive portion 11 is movable with respect to the insulating portion 16. Therefore, the conductive part 11 can reliably contact the solid electrolyte layer 51.

  The second measurement terminal 26 is disposed to face the current collector 41 of the electrode sheet 56. The second measurement terminal 26 is in contact with the current collector 41. The second measurement terminal 26 includes the conductive portion 12 and the insulating portion 17 on the surface facing the current collector 41. The second measurement terminal 26 is configured such that the conductive portion 12 is movable with respect to the insulating portion 17. Therefore, the conductive part 12 can reliably contact the current collector 41.

  The material of the conductive part 11 and the conductive part 12 can be the same as that of the conductive part 10 described above. The shapes of the conductive portion 11 and the conductive portion 12 are the same as those of the conductive portion 10 described above. The material of the insulating part 16 and the insulating part 17 can be the same as that of the insulating part 15 described above. The conductive portion 11 and the conductive portion 12, and the insulating portion 16 and the insulating portion 17 are opposed to each other.

  The calculating device 61 calculates the thickness of the solid electrolyte layer 51 for each capacitance measured by the measuring device 31. The calculation device 61 is a device that includes a processor, a memory, and the like.

  The determination device 36 determines the quality of the solid electrolyte layer 51 based on the thickness of the solid electrolyte layer 51 calculated by the calculation device 61. The determination device 36 is a device that includes a processor, a memory, and the like. The determination device 36 can determine the quality of the solid electrolyte layer 51 for each thickness of the solid electrolyte layer 51 calculated by the calculation device 61.

  The measurement method of the measurement device 31 configured as described above, the calculation method of the calculation device 61, and the determination method of the determination method 30, that is, the inspection method of the inspection device 1100 will be described step by step with reference to FIG.

  First, in the measurement process, the capacitance of the solid electrolyte layer 51 is measured by the measurement device 31 (step S11). Here, electricity flows through the current collector 41 and the active material layer 46. Therefore, the capacitance value of the solid electrolyte layer 51 is determined via the conductive portion 11 of the first measurement terminal 21 through which electricity flows, the active material layer 46, the current collector 41, and the conductive portion 12 of the second measurement terminal 26. It is measuring. That is, since the electrostatic capacity can be measured for each of the conductive portions 11 and the conductive portions 12 that face each other, it is possible to determine pass / fail for each measurement region of the electrode sheet 56. In other words, the quality of each of the divided areas can be determined in the divided area of the measurement area of the electrode sheet 56. Further, by measuring the capacitance, it is possible to determine the quality of the inside of the solid electrolyte layer 51 that cannot be directly measured, the surface in contact with the active material layer 46, or the like.

  Next, in the calculation step, the thickness of the solid electrolyte layer 51 is calculated from the measured capacitance (step S21). The method for calculating the thickness of the solid electrolyte layer 51 is to previously correlate the capacitance value of the solid electrolyte layer 51 with the thickness of the solid electrolyte layer 51, and to calculate the capacitance measured in the obtained correlation. A method of calculating by fitting, a method of calculating from an equation of capacitance, and the like can be given. When calculating the thickness of the solid electrolyte layer 51 from the capacitance equation, the dielectric constant ε of the solid electrolyte and the area S formed by the conductive portion 11 and the active material layer 46 are determined in advance, and the measured capacitance C From this, the thickness d of the solid electrolyte layer is calculated according to the formula C = εS / d.

  In the determination step, the quality of the solid electrolyte layer 51 is determined based on the calculated thickness of the solid electrolyte layer 51 (step S31). The determination is performed by the determination device 36, and the quality is determined for each thickness of the solid electrolyte layer 51 calculated in step S21. Examples of the determination method include a method of comparing a thickness that is a predetermined quality criterion with the calculated thickness of the solid electrolyte layer 51.

  Here, when it is determined that the solid electrolyte layer 51 is defective, the defective portion is fed back in the feedback process (step S41). By feedback, for example, do not send a defective electrode sheet 56 to the next manufacturing process, optimally control the manufacturing conditions of the manufacturing apparatus of the electrode sheet 56, and identify the cause of the defect of the electrode sheet 56 such as equipment failure In addition, it becomes easy to remove only defective portions of the electrode sheet 56, and the electrode sheet 56 can be produced efficiently. Step S41 may be included in step S31.

  On the other hand, when the solid electrolyte layer 51 is determined to be good, the inspection is terminated.

  The present invention can be appropriately changed without departing from the spirit or idea of the invention which can be read from the claims and the entire specification, and such a change is also included in the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 10, 11, 12 ... Conductive part 15, 16, 17 ... Insulating part 20, 21 ... 1st measurement terminal 25, 26 ... 2nd measurement terminal 30, 31 ... Measurement apparatus 35, 36 ... Determination apparatus 40, 41 ... Current collection Body 45, 46 ... Active material layer 50, 51 ... Solid electrolyte layer 55, 56 ... Electrode sheet 61 ... Calculation device 1000, 1100 ... Inspection device

Claims (6)

A measurement method of a battery electrode sheet for measuring an electrode sheet laminated in order of an electrode layer and an insulating layer,
A method for measuring an electrode sheet for a battery, wherein the measurement region of the electrode sheet is divided and the capacitance of the insulating layer is measured.   The method for measuring a battery electrode sheet according to claim 1, further comprising a calculation step of calculating the thickness of the insulating layer from the measured capacitance. Measuring method.   The method for measuring a battery electrode sheet according to claim 1, wherein the insulating layer is a solid electrolyte layer. A battery electrode sheet measuring device for measuring an electrode sheet laminated in the order of an electrode layer and an insulating layer,
A first measuring terminal arranged in the insulating layer of the electrode sheet and divided into a plurality of parts;
A second measurement terminal disposed on the electrode layer with the electrode sheet sandwiched with respect to the first measurement terminal;
An apparatus for measuring an electrode sheet for a battery, comprising:   5. The battery electrode sheet measuring apparatus according to claim 4, further comprising calculation means for calculating the thickness of the insulating layer from the measured capacitance. Measuring device.   The battery electrode sheet measuring apparatus according to claim 4, wherein the insulating layer is a solid electrolyte layer.

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