WO2022244759A1 - Procédé d'inspection de feuille stratifiée, procédé de fabrication de feuille stratifiée, et procédé de fabrication de bloc-batterie - Google Patents

Procédé d'inspection de feuille stratifiée, procédé de fabrication de feuille stratifiée, et procédé de fabrication de bloc-batterie Download PDF

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Publication number
WO2022244759A1
WO2022244759A1 PCT/JP2022/020485 JP2022020485W WO2022244759A1 WO 2022244759 A1 WO2022244759 A1 WO 2022244759A1 JP 2022020485 W JP2022020485 W JP 2022020485W WO 2022244759 A1 WO2022244759 A1 WO 2022244759A1
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WIPO (PCT)
Prior art keywords
laminated sheet
current collector
active material
sheet
roller
Prior art date
Application number
PCT/JP2022/020485
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English (en)
Japanese (ja)
Inventor
英明 堀江
真也 小林
勇輔 中嶋
Original Assignee
Ａｐｂ株式会社
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Publication date
Priority claimed from JP2021083145A external-priority patent/JP2022176624A/ja
Priority claimed from JP2021083144A external-priority patent/JP2022176623A/ja
Application filed by Ａｐｂ株式会社 filed Critical Ａｐｂ株式会社
Publication of WO2022244759A1 publication Critical patent/WO2022244759A1/fr

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    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • 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 laminated sheet inspection method, a laminated sheet manufacturing method, and an assembled battery manufacturing method.
  • Patent Document 1 discloses a battery short-circuit inspection method in which an electrode plate group formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween is inserted into a battery case.
  • a battery short-circuit inspection method is disclosed in which short-circuit defects are inspected while applying pressure to the electrode plate group before the assembly.
  • Patent Document 2 discloses a method for inspecting a unit cell that constitutes an assembled battery, wherein a plurality of unit cells are arranged in a stack, and each unit cell is inspected in a state in which the arrayed unit cell group is pressed in the stacking direction. A method for inspecting a unit cell is disclosed.
  • each unit cell is inspected while the unit cell group arranged in a stack is pressed in the stacking direction, so if a defect is found in the unit cell group, a defect occurs. It is necessary to replace the battery that is in the battery pack.
  • the conventional inspection method is a method for efficiently discovering defects in unit cells, more specifically, in units of laminated sheets such as electrode sheets, electrode sheets with separators, and battery sheets used in cells. It wasn't. Furthermore, the conventional inspection method is not a method for efficiently discovering defects, which causes a decrease in manufacturing efficiency.
  • the present invention has been made to solve the above problems, and it is an object of the present invention to provide a laminated sheet inspection method that can easily detect defects such as short circuits and contribute to improving manufacturing efficiency. is. Another object of the present invention is to provide a method for manufacturing a laminated sheet using the method for inspecting a laminated sheet. A further object of the present invention is to provide a method for manufacturing an assembled battery using the method for inspecting a laminated sheet.
  • a laminated sheet having at least a resin current collector and an active material layer laminated in the lamination direction and having an exposed surface where the resin current collector is exposed is used as an inspection object.
  • a roller-shaped conductor probe rotatable about an axis in an orthogonal direction into contact with at least the exposed surface of the surfaces of the laminated sheet, the laminated sheet is compressed and a plurality of surfaces of the laminated sheet are compressed.
  • a method for inspecting a laminated sheet comprising: a determination step of determining whether or not there is a portion in the laminated sheet where the electrical resistance is outside the allowable range when measured;
  • a method for manufacturing a laminated sheet comprising: selecting a laminated sheet for which it is determined by an inspection method that there is no short-circuited portion or a portion where the electrical resistance is out of the allowable range;
  • An assembled battery comprising a stacking step of stacking a plurality of battery sheets using a laminated sheet determined by an inspection method that there is no short-circuited portion or a portion where the electrical resistance is out of the allowable range. is a manufacturing method.
  • defects such as short circuits can be easily found in units of laminated sheets. Furthermore, according to the present invention, the compression process, which is part of the manufacturing process, and the measurement process, which is part of the inspection process, are simultaneously performed, thereby reducing the number of processes, and reducing manufacturing time, manufacturing cost, and manufacturing space. can be reduced, the production efficiency of the laminated sheet can be improved. As a result, it is possible to manufacture the assembled battery using battery sheets free from defects, so that the production yield of the assembled battery can be improved.
  • FIG. 1 is a schematic perspective view showing an example of the method for inspecting a laminated sheet of the present invention.
  • FIG. 2 is a schematic perspective view showing another example of the laminated sheet inspection method of the present invention.
  • FIG. 3 is a partially cutaway schematic perspective view showing an example of a battery sheet used as a laminated sheet in the laminated sheet inspection method of the present invention.
  • FIG. 4 is a partially cutaway schematic perspective view showing an example of an assembled battery.
  • a laminated sheet having at least a resin current collector and an active material layer laminated in the lamination direction and having an exposed surface where the resin current collector is exposed is used as an inspection object. and a roller-shaped conductor probe rotatable around an axis perpendicular to the lamination direction is brought into contact with at least the exposed surface of the surfaces of the laminated sheet, thereby compressing the laminated sheet and removing the plurality of surfaces of the laminated sheet.
  • the laminated sheet inspection method of the present invention voltages are measured at multiple locations on the surface of the laminated sheet, and based on the voltages, it is determined whether or not there is a short-circuit location in the laminated sheet (hereinafter referred to as the first embodiment). ), and a form (hereinafter referred to as a second embodiment) in which the electrical resistance is measured at a plurality of locations on the surface of the laminated sheet and whether or not there is a location in the laminated sheet where the electrical resistance is outside the allowable range. Either or both can be done.
  • the voltage at the short circuit is 0V. Therefore, when the roller-shaped conductor probe is brought into contact with a short-circuited portion at a pinpoint, the voltage at that portion becomes 0 V, for example, although the voltage at other portions is about 100 mV.
  • the voltage at the short-circuited portion and the surrounding non-shorted portion may be measured together. In this case, the voltage to be measured is not 0V because the value includes not only the short-circuited portion but also the non-short-circuited portion, and is, for example, about 50 mV. In view of such behavior, in the first embodiment of the laminated sheet inspection method of the present invention, if the laminated sheet has a portion where the measured voltage is outside the allowable range, it is determined that the laminated sheet has a short-circuited portion. do.
  • the allowable voltage range is preferably ⁇ 30% of a predetermined value that depends on electrode specifications.
  • the predetermined value can also be obtained from the average value of the voltages measured at a plurality of points on the surface of the laminated sheet, which is the object to be inspected.
  • a laminated sheet which is an object to be inspected, is desired to have a uniform resistance distribution in its plane. Therefore, in the second embodiment of the laminated sheet inspection method of the present invention, if the laminated sheet has a portion where the measured electrical resistance is out of the allowable range, it is determined that the laminated sheet is defective.
  • the increase in electrical resistance is caused by poor dispersion of the conductive material, leading to deterioration in battery resistance.
  • the decrease in electrical resistance is caused by a micro short circuit in which a portion that should be insulated becomes conductive and the electrical resistance decreases, leading to deterioration of battery quality and reliability in the event of an abnormality.
  • the allowable range of electrical resistance is preferably ⁇ 30% of a predetermined value that depends on electrode specifications.
  • the predetermined value can also be obtained from the average value of electrical resistances measured at a plurality of points on the surface of the laminated sheet, which is the object to be inspected.
  • the laminated sheet inspection method of the present invention it is possible to easily find defects such as short circuits in laminated sheet units.
  • the method for inspecting the laminated sheet of the present invention is further described below. The description given below is a matter commonly applied to the first embodiment and the second embodiment of the laminated sheet inspection method of the present invention.
  • a laminated sheet having at least a resin current collector and an active material layer laminated in the lamination direction is used as an inspection object.
  • the electrical resistance in the lateral direction (plane direction) is low, and the current is uniform within the plane. Therefore, when a laminate sheet having a metal current collector is used as an inspection object, defects such as a short circuit cannot be found even by the inspection method of the laminate sheet of the present invention. Thus, it can be said that the laminated sheet inspection method of the present invention is effective only for laminated sheets having resin current collectors.
  • the laminated sheet inspection method of the present invention the following aspects are used as the laminated sheet to be inspected.
  • the resin current collector includes a positive electrode resin current collector and a negative electrode resin current collector
  • the active material layer includes a positive electrode active material layer and a negative electrode active material layer.
  • the laminated sheet is a battery sheet having a positive electrode resin current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode resin current collector, which are laminated in order in the stacking direction.
  • the exposed surface includes a positive electrode exposed surface where the positive electrode resin current collector is exposed and a negative electrode exposed surface where the negative electrode resin current collector is exposed. It is brought into contact with at least one of the negative electrode exposed surfaces.
  • the battery sheet used as the first aspect of the laminated sheet is synonymous with the unit cell.
  • Battery sheets, that is, cells include, for example, lithium ion batteries.
  • the concept of lithium ion battery includes lithium ion secondary battery.
  • an electrode sheet is used as the second aspect of the laminated sheet. More specifically, in the laminated sheet inspection method of the present invention, the laminated sheet is an electrode sheet formed by laminating a resin current collector and an active material layer in the lamination direction.
  • the electrode sheet used as the second aspect of the laminated sheet is, for example, a positive electrode sheet comprising a battery sheet, in which a positive electrode resin current collector and a positive electrode active material layer are laminated, A negative electrode sheet or the like in which a negative electrode resin current collector and a negative electrode active material layer are laminated.
  • the laminated sheet is an electrode sheet with a separator, in which a resin current collector, an active material layer, and a separator are laminated in order in the lamination direction.
  • the electrode sheet with a separator used as the third aspect of the laminated sheet is, for example, a positive electrode resin current collector, a positive electrode active material layer, and a separator, which constitute a battery sheet, laminated in order.
  • the battery sheet, the electrode sheet, and the electrode sheet with a separator are referred to as laminated sheets when not distinguished.
  • the roller-shaped conductor probe in the compression and measurement step, is brought into contact with at least the exposed surface of the surface of the laminated sheet to compress the laminated sheet, and the surface of the laminated sheet Measure the voltage and/or electrical resistance at multiple points in the As described above, in the laminated sheet inspection method of the present invention, the roller-shaped conductor probe is used to compress the laminated sheet, which is a part of the manufacturing process, and the laminated sheet, which is a part of the inspection process.
  • the measuring step of measuring the voltage and/or electrical resistance at multiple points on the surface of the sheet can be performed simultaneously.
  • the compression process which is a part of the manufacturing process
  • the measurement process which is a part of the inspection process
  • the surface of the laminated sheet includes at least the exposed surface where the resin current collector is exposed.
  • the method of bringing the roller-shaped conductor probe into contact with the surface of the laminated sheet is not particularly limited, but from the viewpoint of reliably detecting short-circuits or the like in the plane of the laminated sheet. , the following method as shown in FIGS. 1 and 2 to be described later is preferable.
  • the roller-shaped conductor probe in the compression and measurement steps, it is preferable to bring the roller-shaped conductor probe into contact with a portion of the surface of the laminated sheet facing the lamination direction.
  • the laminated sheet inspection method of the present invention in the compression and measurement step, the laminated sheet is passed through a region in which the roller-shaped conductor probes are arranged facing each other in the lamination direction, so that the roller-shaped conductor probes are Contact with the surface of the laminated sheet is preferred.
  • a conveying mechanism may be used as means for moving the laminated sheet, or other means (for example, manual pulling, etc.) may be used.
  • the roller-shaped conductor probe instead of moving the laminated sheet, the roller-shaped conductor probe may be moved. Moreover, both the laminated sheet and the roller-shaped conductor probe may be moved.
  • the linear pressure when the roller-shaped conductor probe is brought into contact with the surface of the laminated sheet is not particularly limited, but is preferably 300 kg/cm or more and 1000 kg/cm or less.
  • the constituent material of the roller-shaped conductor probe is not particularly limited. It is preferable to be More specifically, the constituent material of the surface of the roller-shaped conductor probe (the portion that contacts the surface of the laminated sheet) is preferably a carbon material.
  • the constituent material of the surface of the roller-shaped conductor probe may be a metallic material such as copper or aluminum.
  • FIG. 1 is a schematic perspective view showing an example of the method for inspecting a laminated sheet of the present invention.
  • a pair of roller-shaped conductor probes 2 are arranged on both sides of the laminated sheet 1 .
  • the laminated sheet 1 has an exposed surface (at least one of the upper surface and the lower surface in FIG. 1) where the resin current collector is exposed.
  • the roller-shaped conductor probe 2 has a shaft 2a and rollers 2b.
  • the shaft 2a and the roller 2b are electrically connected to each other.
  • the end of the shaft 2a serves as a terminal and is connected to a measuring device 4 for measuring voltage and/or electrical resistance.
  • the roller 2b is configured to be rotatable around the axis 2a.
  • the roller-shaped conductor probe 2 having the configuration described above is brought into contact with a portion of the surface of the laminated sheet 1 facing the lamination direction T.
  • the transport mechanism 3 By using the transport mechanism 3 to pass the laminated sheet 1 in the longitudinal direction L through the region where the roller-shaped conductor probes 2 are arranged facing each other in the lamination direction T, the roller-shaped conductor probes 2 can be brought into continuous contact with the surface of the laminated sheet 1 along the length direction L.
  • the laminated sheet 1 is compressed by the roller-shaped conductor probe 2, and the measuring device 4 connected to the shaft 2a of the roller-shaped conductor probe 2 measures the surface of the laminated sheet 1 at a plurality of points in the length direction L.
  • the voltage and/or electrical resistance at can be continuously measured (monitored).
  • the dimension W2 in the width direction W of the roller-shaped conductor probe 2 (more specifically, the roller 2b) is preferably the same as the dimension W1 in the width direction W of the laminated sheet 1. As a result, the entire surface of the laminated sheet 1 can be compressed by the roller-shaped conductor probes 2 .
  • the dimension W2 in the width direction W of the roller-shaped conductor probe 2 may be smaller or larger than the dimension W1 in the width direction W of the laminated sheet 1.
  • Examples of the transport mechanism 3 include a belt conveyor and the like.
  • FIG. 2 is a schematic perspective view showing another example of the inspection method for the laminated sheet of the present invention.
  • a plurality of pairs of roller-shaped conductor probes 2 ′ are arranged along the width direction W on both sides of the laminated sheet 1 .
  • the roller-shaped conductor probe 2' has a shaft 2a' and a roller 2b'.
  • the shaft 2a' and the roller 2b' are electrically connected to each other.
  • the end of the shaft 2a' serves as a terminal and is connected to the measuring device 4.
  • the roller 2b' is configured to be rotatable around the axis 2a'.
  • the roller-shaped conductor probe 2' having the configuration described above is brought into contact with a portion of the surface of the laminated sheet 1 facing the lamination direction T.
  • the roller-shaped conductor The probes 2 ′ can be brought into contact with the surface of the laminated sheet 1 along the width direction W at the same time and continuously along the length direction L.
  • the laminated sheet 1 is compressed by the roller-shaped conductor probe 2 ′, and the voltage at multiple points in the width direction W of the surface of the laminated sheet 1 is measured by the measuring device 4 connected to the roller-shaped conductor probe 2 ′. And/or while simultaneously measuring the electrical resistance, the voltage and/or the electrical resistance can be continuously measured at a plurality of locations in the length direction L of the surface of the laminated sheet 1.
  • the distance W2' between the ends in the width direction W of all roller-shaped conductor probes 2' is preferably the same as the dimension W1 in the width direction W of the laminated sheet 1. As a result, the entire surface of the laminated sheet 1 can be compressed by all the roller-shaped conductor probes 2'. Note that the distance W2' between the ends in the width direction W of all the roller-shaped conductor probes 2' is, more specifically, the rollers present at both ends in the width direction W of all the roller-shaped conductor probes 2'. It is the distance between the ends of the shaped conductor probe 2'.
  • the distance W2' between the ends in the width direction W of all roller-shaped conductor probes 2' may be smaller or larger than the dimension W1 in the width direction W of the laminated sheet 1.
  • the interval between adjacent roller-shaped conductor probes 2' is not particularly limited, but is preferably equal.
  • a plurality of pairs of roller-shaped conductor probes 2' may be arranged along the width direction W on both sides of the laminated sheet 1 in a so-called zigzag pattern.
  • a plurality of pairs of conductor probes along the width direction W are provided at positions spaced apart in the length direction L, apart from the plurality of pairs of roller-shaped conductor probes 2' shown in FIG. It may be arranged further.
  • Example 1 In Example 1, as shown in FIG. 1, a belt conveyor is used as the transport mechanism 3 to transport the laminated sheet 1 at a transport speed of 20 m/min. to pass in the length direction L.
  • a battery sheet is used as the laminated sheet 1.
  • the shaft 2a and roller 2b of the roller-shaped conductor probe 2 are both made of stainless steel, and a graphite sheet is attached to the surface of the roller 2b.
  • the constituent material of the surface of the roller-shaped conductor probe 2 (the portion in contact with the surface of the laminated sheet 1) is a carbon material.
  • the diameter of the roller 2b is 50 cm.
  • the roller-shaped conductor probes 2 compress the laminate sheet 1 with a linear pressure of 400 kg/cm.
  • the voltage of the laminated sheet 1 is monitored by a measuring device 4 connected to the shaft 2a of the roller-shaped conductor probe 2.
  • a memory high logger "LR8401" manufactured by Hioki Electric Co., Ltd. is used as the measuring device 4.
  • Example 2 In Example 2, in Example 1, the electrical resistance of the laminated sheet 1 is monitored by the measuring device 4 connected to the shaft 2a of the roller-shaped conductor probe 2 .
  • the measuring device 4 As the measuring device 4, a chemical impedance analyzer "IM3590" manufactured by Hioki Electric Co., Ltd. is used.
  • the electrical resistance of the laminated sheet 1 As a result of monitoring the electrical resistance of the laminated sheet 1, it was confirmed that the electrical resistance was 57 ⁇ cm 2 in the normal region, and decreased to 44 ⁇ cm 2 when passing through the intentionally short-circuited portion. That is, the difference between the electrical resistance of the normal region and the electrical resistance of the short-circuited portion was 13 ⁇ cm 2 .
  • FIG. 3 is a partially cutaway schematic perspective view showing an example of a battery sheet used as a laminated sheet in the laminated sheet inspection method of the present invention.
  • a negative electrode 13 having a negative electrode active material layer 16 provided on the surface of the negative electrode 19 is laminated with a substantially flat plate-shaped separator 14 interposed therebetween to form a substantially rectangular plate shape as a whole.
  • Positive electrode 12 and negative electrode 13 function, for example, as a positive electrode and a negative electrode of a lithium ion battery, respectively.
  • the battery sheet 10 is arranged between the positive electrode resin current collector 17 and the negative electrode resin current collector 19 to fix the periphery of the separator 14 , and also includes the positive electrode active material layer 15 , the separator 14 and the negative electrode active material layer 16 . It is preferable to have an annular frame member 18 that seals the .
  • the positive electrode resin current collector 17 and the negative electrode resin current collector 19 are positioned by the frame member 18 so as to face each other with a predetermined gap, and the separator 14 and the positive electrode active material layer 15, and the separator 14 and the negative electrode active material layer. 16 are also positioned by a frame member 18 so as to face each other with a predetermined spacing.
  • the distance between the positive electrode resin current collector 17 and the separator 14 and the distance between the negative electrode resin current collector 19 and the separator 14 are adjusted according to the capacity of the battery sheet 10, for example, the lithium ion battery. In this manner, the positional relationship among the positive electrode resin current collector 17, the negative electrode resin current collector 19, and the separator 14 is determined so as to obtain the required spacing.
  • the positive electrode active material layer contains a positive electrode active material.
  • transition metal element eg, LiCoO 2 , LiNiO 2 , LiAlMnO 4 , LiMnO 2 , LiMn 2 O 4
  • the lithium-containing transition metal phosphate may have a transition metal site partially substituted with another transition metal.
  • the positive electrode active materials described above may be used singly or in combination of two or more.
  • the positive electrode active material is preferably a coated positive electrode active material coated with a conductive aid and a coating resin.
  • the positive electrode active material is coated with the coating resin, the volume change of the electrode is moderated, so expansion of the electrode can be suppressed.
  • conductive aids include metallic conductive aids [e.g., aluminum, stainless steel (SUS), silver, gold, copper, titanium, etc.], carbon-based conductive aids [e.g., graphite, carbon black (acetylene black, chain black, furnace black, channel black, thermal lamp black, etc.], mixtures thereof, alloys thereof, metal oxides thereof, and the like.
  • metallic conductive aids e.g., aluminum, stainless steel (SUS), silver, gold, copper, titanium, etc.
  • carbon-based conductive aids e.g., graphite, carbon black (acetylene black, chain black, furnace black, channel black, thermal lamp black, etc.]
  • silver, gold, aluminum, stainless steel, and carbon-based conductive additives are preferable.
  • agent is more preferable, and a carbon-based conductive aid is particularly preferable.
  • the conductive aid may be a particulate ceramic material or a resin material coated with a conductive material (preferably a metal one of the conductive aids described above) by plating or the like.
  • the conductive aids described above may be used singly or in combination of two or more.
  • the form (shape) of the conductive aid is not particularly limited, and may be in the form of particles, or may be in a form other than the form of particles.
  • the form other than the particle form may be a form that has been put into practical use as a so-called filler-based conductive aid, such as carbon nanofibers and carbon nanotubes.
  • the ratio of the coating resin and the conductive aid is not particularly limited, but from the viewpoint of the internal resistance of the battery, etc., the weight ratio of the coating resin (resin solid content weight): conductive aid is from 1:0.01. It is preferably 1:50, more preferably 1:0.2 to 1:3.0.
  • the coating resin one described as a non-aqueous secondary battery active material coating resin in JP-A-2017-054703 is preferably used.
  • the positive electrode active material layer may further contain another conductive aid in addition to the conductive aid contained in the coated positive electrode active material.
  • the same one as the conductive aid contained in the above-described coated positive electrode active material is preferably used.
  • the positive electrode active material layer is preferably a non-binding material that contains a positive electrode active material and does not contain a binder (also referred to as a binder) that binds the positive electrode active materials together.
  • the non-bound body means that the position of the positive electrode active material is not fixed by a binder, and the positive electrode active material and the current collector are not fixed irreversibly. .
  • the positive electrode active material layer may further contain an adhesive resin.
  • a non-aqueous secondary battery active material coating resin described in JP-A-2017-054703 is mixed with a small amount of an organic solvent to adjust its glass transition temperature to room temperature or lower.
  • Those described as adhesives in JP-A-10-255805 are preferably used.
  • Adhesive resin means a resin that does not solidify even when the solvent component is volatilized and dried, and has adhesiveness (the property of adhering by applying a slight pressure without using water, solvent, heat, etc.) do.
  • a solution-drying type electrode binder used as a binding material is one that evaporates a solvent component to dry and solidify, thereby firmly adhering and fixing active materials to each other.
  • the solution-drying type electrode binder (binder) and the adhesive resin are different materials.
  • the thickness of the positive electrode active material layer is not particularly limited, it is preferably 150 to 600 ⁇ m, more preferably 200 to 450 ⁇ m from the viewpoint of battery performance.
  • the negative electrode active material layer contains a negative electrode active material.
  • negative electrode active material known negative electrode active materials for lithium ion batteries can be used. carbonized resin etc.), cokes (e.g., pitch coke, needle coke, petroleum coke, etc.), carbon fiber, etc.], silicon-based materials [e.g., silicon, silicon oxide (SiO x ), silicon- Carbon composites (for example, carbon particles coated with silicon and/or silicon carbide, silicon particles or silicon oxide particles coated with carbon and/or silicon carbide, silicon carbide, etc.), silicon alloys ( silicon-aluminum alloy, silicon-lithium alloy, silicon-nickel alloy, silicon-iron alloy, silicon-titanium alloy, silicon-manganese alloy, silicon-copper alloy, silicon-tin alloy, etc.)], conductive polymer (e.g., polyacetylene, polypyrrole, etc.), metals (e.g., tin, aluminum, zirconium, titanium, etc.), metal oxides (e.g., titanium oxides, lithium-titanium oxides,
  • the negative electrode active materials described above may be used singly, or two or more of them may be used in combination.
  • the negative electrode active material may be a coated negative electrode active material coated with a conductive aid and a coating resin.
  • the volume change of the electrode is moderated, so expansion of the electrode can be suppressed.
  • the same conductive aid and coating resin as those contained in the coated positive electrode active material described above are preferably used.
  • the negative electrode active material layer may further contain another conductive aid in addition to the conductive aid contained in the coated negative electrode active material.
  • the same one as the conductive aid contained in the above-described coated positive electrode active material is preferably used.
  • the negative electrode active material layer is preferably a non-binding material that does not contain a binder that binds the negative electrode active materials together.
  • the negative electrode active material layer may further contain an adhesive resin, similar to the positive electrode active material layer.
  • the thickness of the negative electrode active material layer is not particularly limited, it is preferably 150 to 600 ⁇ m, more preferably 200 to 450 ⁇ m from the viewpoint of battery performance.
  • the positive electrode resin current collector and the negative electrode resin current collector are resin current collectors each made of a conductive polymer material.
  • the form (shape) of the positive electrode resin current collector and the negative electrode resin current collector is not particularly limited, and may be a sheet-like current collector made of a conductive polymer material, or a conductive polymer material. It may be a deposited layer composed of fine particles composed of
  • each of the positive electrode resin current collector and the negative electrode resin current collector is not particularly limited, but is preferably 50 to 500 ⁇ m.
  • Examples of the conductive polymer material that constitutes the positive electrode resin current collector and the negative electrode resin current collector include conductive polymers and resins to which a conductive agent is added as necessary.
  • the same conductive aid as that contained in the coated positive electrode active material described above is preferably used.
  • resins constituting conductive polymer materials include polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), polycycloolefin (PCO), polyethylene terephthalate (PET), and polyethernitrile (PEN). , polytetrafluoroethylene (PTFE), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVdF), epoxy resin, silicone resin, these and the like.
  • polyethylene, polypropylene, polymethylpentene, and polycycloolefin are preferred, and polyethylene, polypropylene, and polymethylpentene are more preferred.
  • the resins described above may be used singly or in combination of two or more.
  • separator known lithium ion battery separators can be used.
  • the battery sheet contains the electrolyte present in the positive electrode active material layer and the negative electrode active material layer.
  • the electrolytic solution a known electrolytic solution containing an electrolyte and a non-aqueous solvent, which is used in the production of known lithium-ion batteries, can be used.
  • electrolyte those used in known electrolytic solutions can be used.
  • Lithium salts of organic acids such as LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 and LiC(CF 3 SO 2 ) 3 are included.
  • imide-based electrolytes such as LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 and LiPF 6 are preferred from the viewpoint of battery output and charge-discharge cycle characteristics. preferable.
  • non-aqueous solvent those used in known electrolytic solutions can be used.
  • the electrolyte concentration of the electrolytic solution is preferably 1-5 mol/L, more preferably 1.5-4 mol/L, and even more preferably 2-3 mol/L.
  • the electrolyte concentration of the electrolyte solution is lower than 1 mol/L, the input/output characteristics of the battery may not be sufficiently obtained. If the electrolyte concentration of the electrolytic solution is higher than 5 mol/L, the electrolyte may precipitate.
  • the electrolyte concentration of the electrolyte can be confirmed by extracting the electrolyte from a battery sheet, for example, a lithium ion battery without using a solvent or the like and measuring the concentration.
  • the laminated sheet manufacturing method of the present invention comprises a sorting step of sorting out laminated sheets determined by the laminated sheet inspection method of the present invention to have no short-circuited portions or portions with electrical resistance outside the allowable range.
  • the sorting step removes defective products that have short-circuited portions or locations with electrical resistance out of the allowable range, while eliminating short-circuited locations or locations with electrical resistance out of the allowable range.
  • a laminated sheet can be efficiently obtained.
  • FIG. 4 is a partially cutaway perspective view showing an example of an assembled battery.
  • FIG. 4 shows a state in which a portion of the exterior body is removed.
  • the assembled battery 100 shown in FIG. 4 is formed by stacking and connecting a plurality of battery sheets 10 .
  • the example shown in FIG. 4 shows a state in which five battery sheets 10 shown in FIG. 3 are stacked.
  • the battery sheets 10 are laminated so that the upper surface of the negative electrode resin current collector 19 and the lower surface of the positive electrode resin current collector 17 are adjacent to each other. In this case, a plurality of battery sheets 10 are connected in series.
  • the assembled battery 100 is housed in the exterior body 110 .
  • Examples of the exterior body 110 include a metal can case, a polymer-metal composite film, and the like.
  • a conductive sheet is provided on the surface of the positive electrode resin current collector that constitutes the bottom surface of the assembled battery 100 . A part of the conductive sheet is pulled out from the outer package 110 to serve as a positive electrode extraction terminal 120 .
  • Another conductive sheet is provided on the surface of the negative electrode resin current collector that constitutes the uppermost surface of the assembled battery 100 .
  • a part of another conductive sheet is pulled out from the outer package 110 to serve as a negative electrode extraction terminal 130 .
  • the constituent material of the conductive sheet that serves as the positive electrode lead terminal 120 and the negative electrode lead terminal 130 is not particularly limited as long as it is a material having conductivity, and examples thereof include copper, aluminum, titanium, stainless steel, nickel, and alloys thereof. metal, calcined carbon, conductive polymer, conductive glass, and the like.
  • the laminated sheet inspection method of the present invention it is possible to detect defects such as minute short circuits of several millimeters and short circuits in laminated sheet units.
  • the assembled battery manufacturing method of the present invention the assembled battery can be manufactured using the battery sheet without any defects, and thus the manufacturing yield of the assembled battery can be improved.
  • a laminated sheet having at least a resin current collector and an active material layer laminated in the lamination direction and having an exposed surface where the resin current collector is exposed is used as an inspection object, and the lamination direction
  • the laminated sheet is compressed and the surface of the laminated sheet a compressing and measuring step of measuring the voltage at multiple points; and a determination step of determining whether or not there is a short circuit in the laminated sheet based on the voltage.
  • the resin current collector includes a positive electrode resin current collector and a negative electrode resin current collector;
  • the active material layer includes a positive electrode active material layer and a negative electrode active material layer,
  • the laminated sheet is a battery sheet having the positive electrode resin current collector, the positive electrode active material layer, the separator, the negative electrode active material layer, and the negative electrode resin current collector, which are stacked in order in the stacking direction,
  • the exposed surface of the laminated sheet includes a positive electrode exposed surface where the positive electrode resin current collector is exposed and a negative electrode exposed surface where the negative electrode resin current collector is exposed,
  • the laminated sheet inspection method according to (1-1) wherein in the compression and measurement step, the roller-shaped conductor probe is brought into contact with at least one of the positive electrode exposed surface and the negative electrode exposed surface.
  • the laminated sheet is passed through a region in which the roller-shaped conductor probes are arranged facing each other in the lamination direction, so that the roller-shaped conductor probes are The method for inspecting a laminated sheet according to any one of (1-1) to (1-5), wherein the surface of the laminated sheet is contacted.
  • (1-8) comprising a sorting step of sorting the laminated sheet determined to have no short-circuit portion by the laminated sheet inspection method according to any one of (1-1) to (1-7);
  • a method for producing a laminated sheet characterized by: (1-9) A plurality of battery sheets using a laminated sheet determined to have no short circuit by the laminated sheet inspection method according to any one of (1-1) to (1-7) are laminated. and a stacking step.
  • a laminated sheet having at least a resin current collector and an active material layer laminated in the lamination direction and having an exposed surface where the resin current collector is exposed is used as an inspection object, and the lamination direction
  • the laminated sheet is compressed and the surface of the laminated sheet a compressing and measuring step of measuring electrical resistance at multiple locations;
  • a laminated sheet inspection method comprising: determining whether or not there is a portion in the laminated sheet where the electrical resistance is out of the allowable range.
  • the resin current collector includes a positive electrode resin current collector and a negative electrode resin current collector;
  • the active material layer includes a positive electrode active material layer and a negative electrode active material layer,
  • the laminated sheet is a battery sheet having the positive electrode resin current collector, the positive electrode active material layer, the separator, the negative electrode active material layer, and the negative electrode resin current collector, which are stacked in order in the stacking direction,
  • the exposed surface of the laminated sheet includes a positive electrode exposed surface where the positive electrode resin current collector is exposed and a negative electrode exposed surface where the negative electrode resin current collector is exposed,
  • the laminated sheet inspection method according to (2-1) wherein in the compression and measurement step, the roller-shaped conductor probe is brought into contact with at least one of the positive electrode exposed surface and the negative electrode exposed surface.
  • the laminated sheet is passed through a region in which the roller-shaped conductor probes are arranged facing each other in the lamination direction, so that the roller-shaped conductor probes are The method for inspecting a laminated sheet according to any one of (2-1) to (2-5), wherein the surface of the laminated sheet is contacted.
  • the laminated sheet to be inspected by the laminated sheet inspection method of the present invention is particularly useful for lithium ion batteries used in mobile phones, personal computers, hybrid vehicles, and electric vehicles.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

L'invention concerne un procédé d'inspection de feuille stratifiée qui est caractéristique en ce qu'il comporte : une étape de compression et mesure au cours de laquelle une sonde conductrice sous forme de rouleau qui possède au moins un collecteur en résine stratifié dans une direction stratification, et une couche de matière active, et qui permet une rotation autour d'un axe dans une direction perpendiculaire à ladite direction de stratification, avec une feuille stratifiée possédant une surface exposition d'exposition dudit collecteur en résine en tant qu'objet d'inspection, est mise en contact au moins avec ladite surface exposition à la surface de ladite feuille stratifiée, comprimant ainsi ladite feuille stratifiée, et simultanément la tension et/ou la résistance électrique en une pluralité de points de la surface de ladite feuille stratifiée, est mesurée ; et une étape de jugement au cours de laquelle la présence ou l'absence de points de court-circuit sur ladite feuille stratifiée est jugée sur la base de ladite tension, dans le cas où ladite tension est mesurée, et la présence ou l'absence sur ladite feuille stratifiée de points auxquels ladite résistance électrique se trouve en dehors d'une plage acceptable, est jugée dans le cas où ladite résistance électrique est mesurée.
PCT/JP2022/020485 2021-05-17 2022-05-17 Procédé d'inspection de feuille stratifiée, procédé de fabrication de feuille stratifiée, et procédé de fabrication de bloc-batterie WO2022244759A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2021083145A JP2022176624A (ja) 2021-05-17 2021-05-17 積層シートの検査方法、積層シートの製造方法、及び、組電池の製造方法
JP2021-083145 2021-05-17
JP2021-083144 2021-05-17
JP2021083144A JP2022176623A (ja) 2021-05-17 2021-05-17 積層シートの検査方法、積層シートの製造方法、及び、組電池の製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024199533A1 (fr) * 2023-03-30 2024-10-03 蜂巢能源科技(无锡)有限公司 Outil de test de court-circuit de feuille d'électrode et système de production de feuille d'électrode

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009170134A (ja) * 2008-01-11 2009-07-30 Toyota Motor Corp 電池の製造方法および製造装置
JP2016072026A (ja) * 2014-09-29 2016-05-09 株式会社日立ハイテクファインシステムズ 蓄電デバイスの製造装置および蓄電デバイスの製造方法
WO2020085290A1 (fr) * 2018-10-22 2020-04-30 三洋化成工業株式会社 Procédé de production d'un collecteur de résine pour électrodes négatives, procédé de production d'électrode négative pour batteries au lithium-ion et procédé de production d'une batterie au lithium-ion
JP2020087918A (ja) * 2018-11-16 2020-06-04 三洋化成工業株式会社 全固体リチウムイオン二次電池

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009170134A (ja) * 2008-01-11 2009-07-30 Toyota Motor Corp 電池の製造方法および製造装置
JP2016072026A (ja) * 2014-09-29 2016-05-09 株式会社日立ハイテクファインシステムズ 蓄電デバイスの製造装置および蓄電デバイスの製造方法
WO2020085290A1 (fr) * 2018-10-22 2020-04-30 三洋化成工業株式会社 Procédé de production d'un collecteur de résine pour électrodes négatives, procédé de production d'électrode négative pour batteries au lithium-ion et procédé de production d'une batterie au lithium-ion
JP2020087918A (ja) * 2018-11-16 2020-06-04 三洋化成工業株式会社 全固体リチウムイオン二次電池

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024199533A1 (fr) * 2023-03-30 2024-10-03 蜂巢能源科技(无锡)有限公司 Outil de test de court-circuit de feuille d'électrode et système de production de feuille d'électrode

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