WO2021192406A1 - Secondary battery - Google Patents

Secondary battery Download PDF

Info

Publication number
WO2021192406A1
WO2021192406A1 PCT/JP2020/042693 JP2020042693W WO2021192406A1 WO 2021192406 A1 WO2021192406 A1 WO 2021192406A1 JP 2020042693 W JP2020042693 W JP 2020042693W WO 2021192406 A1 WO2021192406 A1 WO 2021192406A1
Authority
WO
WIPO (PCT)
Prior art keywords
positive electrode
negative electrode
secondary battery
wiring
insulating tape
Prior art date
Application number
PCT/JP2020/042693
Other languages
French (fr)
Japanese (ja)
Inventor
史人 石井
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2021192406A1 publication Critical patent/WO2021192406A1/en

Links

Images

Classifications

    • 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
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • 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

  • This technology is related to secondary batteries.
  • This technology was made in view of such problems, and its purpose is to provide a secondary battery capable of suppressing breakage of internal wiring due to an external load.
  • the secondary battery according to an embodiment of the present technology includes a flexible exterior member, a battery element housed inside the exterior member and having a flat shape, and a first battery element extending from the inside to the outside of the exterior member.
  • a wiring member and a plurality of second wiring members arranged inside the exterior member are provided, the first wiring member includes a facing portion facing the battery element, and the facing portion has a flat shape inside the exterior member.
  • One end of each of the plurality of second wiring members is connected to the battery element, and the other end of each of the plurality of second wiring members is provided on the opposite portion of the first wiring member. It is connected by at least one crimped structure.
  • the battery element is housed inside the flexible exterior member, and the first wiring member and the caulking structure extend from the inside to the outside of the exterior member.
  • the battery element is connected to the second wiring member arranged inside the exterior member. Therefore, the breakage of the internal wiring of the secondary battery due to the external load is suppressed.
  • effect of the present technology is not necessarily limited to the effect described here, and may be any effect of a series of effects related to the present technology described later.
  • the secondary battery described here is a secondary battery that obtains battery capacity by using the occlusion and release of an electrode reactant, and includes a positive electrode, a negative electrode, and an electrolytic solution.
  • the charge capacity of the negative electrode is larger than the discharge capacity of the positive electrode in order to prevent the electrode reactant from depositing on the surface of the negative electrode during charging. That is, the electrochemical capacity per unit area of the negative electrode is larger than the electrochemical capacity per unit area of the positive electrode.
  • the electrode reactant is not particularly limited, but is a light metal such as an alkali metal and an alkaline earth metal.
  • Alkali metals include lithium, sodium and potassium.
  • Alkaline earth metals include beryllium, magnesium and calcium.
  • a secondary battery that obtains battery capacity by using the storage and release of lithium is a so-called lithium ion secondary battery, and in a lithium ion secondary battery, lithium is stored and released in an ionic state.
  • FIG. 1 is a perspective view showing a configuration of a secondary battery according to an embodiment of the present technology.
  • FIG. 2 is a perspective view showing the configuration of the battery element 20 shown in FIG.
  • FIG. 3 is a cross-sectional view showing the respective configurations of the positive electrode 21 and the negative electrode 22.
  • 4 and 5 are cross-sectional views showing the configuration of the secondary battery shown in FIG.
  • FIG. 6 is a cross-sectional view showing a specific configuration of a caulking structure 53 connecting a positive electrode lead 30 and a plurality of positive electrode tabs 50.
  • FIG. 4 shows a cross section along the line AA of FIG. 1
  • FIG. 5 shows a cross section along the line BB of FIG.
  • the vertical direction is the height direction of the secondary battery and the left-right direction is the thickness direction of the secondary battery, facing FIGS. 4 and 5. Further, in the height direction of the secondary battery, the upward direction facing FIGS. 4 and 5 is the upper side of the secondary battery, and the lower direction is the lower side of the secondary battery.
  • the secondary battery includes an exterior film 10, a battery element 20, a positive electrode wiring 200, a negative electrode wiring 300, a positive electrode sealant 70, a negative electrode sealant 80, and a positive electrode insulating tape 90. It includes 100, negative electrode insulating tapes 110 and 120, and auxiliary insulating tape 130.
  • the positive electrode wiring 200 includes a positive electrode lead 30 and a plurality of positive electrode tabs 50
  • the negative electrode wiring 300 includes a negative electrode lead 40 and a plurality of negative electrode tabs 60.
  • the battery element 20 is housed inside the exterior film 10, and the positive electrode wiring 200 and the negative electrode wiring 300 are connected to the battery element 20.
  • Each of the positive electrode wiring 200 and the negative electrode wiring 300 extends from the inside to the outside of the exterior film 10 in a direction common to each other.
  • the secondary battery according to the present embodiment is a laminated film type secondary battery in which the exterior film 10 is used as the exterior member for accommodating the battery element 20.
  • the secondary battery has a flat three-dimensional shape.
  • the exterior film 10 is a flexible (or flexible) exterior member, and more specifically, as shown in FIGS. 1, 4 and 5, a hollow bag-shaped member.
  • the exterior film 10 contains any one or more of a polymer material, a metal material, and the like.
  • the exterior film 10 is a three-layer laminated film in which a fusion layer, a metal layer, and a surface protective layer are laminated in this order from the inside.
  • the fusion layer is a polymer film containing a polymer material such as polypropylene, and can be fused by using a heat fusion method or the like.
  • the metal layer is a metal leaf containing a metal material such as aluminum.
  • the surface protective layer is a polymer film containing a polymer material such as nylon.
  • the number of layers of the exterior film 10 which is a laminated film is not particularly limited, and may be two layers or four or more layers. Further, the exterior film 10 is not limited to multiple layers and may be a single layer.
  • the exterior film 10 has an opening 10K1 for projecting the positive electrode wiring 200 and an opening 10K2 for projecting the negative electrode wiring 300.
  • the opening 10K1 is sealed with the positive electrode sealant 70 in a state where the positive electrode wiring 200 extends to the outside of the exterior film 10 via the opening 10K1.
  • the opening 10K2 is sealed with the negative electrode sealant 80 in a state where the negative electrode wiring 300 extends to the outside of the exterior film 10 via the opening 10K2.
  • the battery element 20 is an element that advances the charge / discharge reaction, and is housed inside the exterior film 10 as shown in FIGS. 1 to 5.
  • the battery element 20 includes a positive electrode 21, a negative electrode 22, a separator 23, and an electrolytic solution which is a liquid electrolyte. However, in FIGS. 1 to 5, the illustration of the electrolytic solution is omitted.
  • the positive electrode 21 and the negative electrode 22 are wound around the separator 23. Specifically, the positive electrode 21 and the negative electrode 22 are laminated with each other via the separator 23, and are wound in a state of being laminated with each other via the separator 23. Therefore, the battery element 20 is a wound electrode body including a positive electrode 21 and a negative electrode 22 wound via a separator 23.
  • the number of turns of each of the positive electrode 21, the negative electrode 22, and the separator 23 is not particularly limited and can be set arbitrarily.
  • the height of the positive electrode 21 is smaller than the height of the separator 23. This is to prevent a short circuit caused by the positive electrode 21.
  • the height of the negative electrode 22 is smaller than the height of the separator 23 and larger than the height of the positive electrode 21. This is to prevent a short circuit caused by the negative electrode 22 and to prevent a short circuit between the positive electrode 21 and the negative electrode 22 due to the precipitation of lithium during charging and discharging.
  • the positive electrode 21 is one of the electrodes constituting the battery element 20.
  • the positive electrode 21 includes a positive electrode current collector 21A and a positive electrode active material layer 21B.
  • the positive electrode current collector 21A is a metal foil containing a metal material such as aluminum.
  • the positive electrode active material layer 21B is provided on both sides of the positive electrode current collector 21A. However, the positive electrode active material layer 21B may be provided on only one side of the positive electrode current collector 21A.
  • the positive electrode active material layer 21B contains a positive electrode active material that occludes and releases lithium, and the positive electrode active material contains any one or more of lithium-containing compounds such as a lithium-containing transition metal compound. ..
  • the lithium-containing transition metal compound is an oxide, a phosphoric acid compound, a silicic acid compound, a boric acid compound or the like containing one or more kinds of transition metal elements as constituent elements together with lithium.
  • the positive electrode active material layer 21B may further contain a positive electrode binder, a positive electrode conductive agent, and the like.
  • the negative electrode 22 is the other electrode constituting the battery element 20.
  • the negative electrode 22 includes a negative electrode current collector 22A and a negative electrode active material layer 22B.
  • the negative electrode current collector 22A is a metal foil containing a metal material such as copper.
  • the negative electrode active material layer 22B is provided on both sides of the negative electrode current collector 22A. However, the negative electrode active material layer 22B may be provided on only one side of the negative electrode current collector 22A.
  • the negative electrode active material layer 22B contains a negative electrode active material that occludes and releases lithium, and the negative electrode active material contains any one or more of carbon materials and metal-based materials.
  • the carbon material is graphite or the like.
  • the metal-based material is a material containing one or more of metal elements and metalloid elements capable of forming an alloy with lithium as constituent elements, and specifically contains silicon, tin, and the like. There is.
  • the metal-based material may be a simple substance, an alloy, a compound, or a mixture of two or more of them.
  • the negative electrode active material layer 22B may further contain a negative electrode binder, a negative electrode conductive agent, and the like.
  • the separator 23 is an insulating porous film interposed between the positive electrode 21 and the negative electrode 22.
  • the separator 23 can allow lithium to pass through while preventing a short circuit between the positive electrode 21 and the negative electrode 22.
  • the separator 23 contains any one or more of the polymer materials such as polyethylene.
  • the electrolytic solution is impregnated in each of the positive electrode 21, the negative electrode 22, and the separator 23, and contains a solvent and an electrolyte salt.
  • the solvent contains any one or more of non-aqueous solvents (organic solvents) such as carbonic acid ester compounds, carboxylic acid ester compounds and lactone compounds.
  • the electrolyte salt contains any one or more of light metal salts such as lithium salt.
  • the positive electrode active material layer 21B is provided as a part of the positive electrode current collector 21A, and the negative electrode active material layer 22B is the negative electrode current collector 22A. It is provided in a part of.
  • the positive electrode current collector 21A since the positive electrode current collector 21A is not provided with the positive electrode active material layer 21B at the inner and outer ends of the positive electrode 21, the positive electrode current collector 21A has exposed portions at both ends. It has 21 AH. As a result, the positive electrode 21 has a foil winding structure in which only the positive electrode current collector 21A is wound around the inner and outer ends of the winding.
  • the negative electrode current collector 22A since the negative electrode current collector 22A is not provided with the negative electrode active material layer 22B at the inner and outer ends of the negative electrode 22, the negative electrode current collector 22A has exposed portions 22AH at both ends. Have. As a result, the negative electrode 22 has a foil winding structure in which only the negative electrode current collector 22A is wound around the inner and outer ends of the winding.
  • the positive electrode wiring 200 extends from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K1 and is connected to the positive electrode 21 of the battery element 20.
  • the negative electrode wiring 300 extends from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K2, and is connected to the negative electrode 22 of the battery element 20.
  • the positive electrode lead 30 is a first wiring member extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K1.
  • One end of the positive electrode lead 30 is connected to the other end of each of the plurality of positive electrode tabs 50 inside the exterior film 10. On the other hand, the other end of the positive electrode lead 30 extends to the outside of the exterior film 10.
  • the caulking structure 53 is a structure in which a part of the positive electrode lead 30 and the positive electrode tab 50 is folded back and crimped through through holes penetrating both the positive electrode lead 30 and the plurality of positive electrode tabs 50, which will be described later. Represents.
  • a conductive member or the like may be present inside the through hole of the caulking structure 53, but it is preferable that no conductive member or the like is present from the viewpoint of making the caulking structure 53 compact.
  • the positive electrode lead 30 and the plurality of positive electrode tabs 50 are connected by the caulking structure 53, so that the connection strength of the positive electrode lead 30 and the plurality of positive electrode tabs 50 can be further increased, which is caused by an external load. Breakage of internal wiring can be further suppressed.
  • the positive electrode lead 30 is bent in the thickness direction of the flat battery element 20 inside the exterior film 10.
  • the positive electrode lead 30 includes lead portions 30A and 30B.
  • the lead portion 30A is a portion extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K1.
  • the lead portion 30B is an opposing portion that extends in the thickness direction of the battery element 20 that intersects the extending direction of the lead portion 30A while facing the battery element 20 inside the exterior film 10.
  • the lead portion 30B has a lower surface M1, an upper surface M2, and a side surface M3.
  • the lower surface M1 is a surface (opposing surface) on which the lead portion 30B faces the battery element 20.
  • the upper surface M2 is a surface (opposite surface) on the opposite side of the lower surface M1.
  • the side surface M3 is a surface located between the lower surface M1 and the upper surface M2 and connected to each of the lower surface M1 and the upper surface M2.
  • the lower surface M1 of the lead portion 30B may be parallel to the upper surface 20M of the battery element 20, or may be inclined with respect to the upper surface 20M. good.
  • the inclination angle of the lower surface M1 with respect to the upper surface 20M is not particularly limited as long as the facing relationship between the lead portion 30B and the battery element 20 is guaranteed.
  • the positive electrode lead 30 contains a metal material such as aluminum as in the positive electrode current collector 21A.
  • the positive electrode lead 30 may contain the same metal material as the positive electrode current collector 21A, or may contain a metal material different from that of the positive electrode current collector 21A.
  • the negative electrode lead 40 has the same configuration as that of the positive electrode lead 30 described above. That is, as shown in FIGS. 1 and 5, the negative electrode lead 40 is a first wiring member extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K2.
  • One end of the negative electrode lead 40 is connected to the other end of each of the plurality of negative electrode tabs 60 inside the exterior film 10. On the other hand, the other end of the negative electrode lead 40 extends to the outside of the exterior film 10.
  • one end of the negative electrode lead 40 is connected to the joint J2 of the negative electrode tab 60, which will be described later, by at least one caulking structure 63.
  • the negative electrode lead 40 and the plurality of negative electrode tabs 60 are connected by the caulking structure 63, so that the connection strength of the negative electrode lead 40 and the plurality of negative electrode tabs 60 can be further increased, which is caused by an external load. Breakage of internal wiring can be further suppressed.
  • the negative electrode lead 40 is bent in the thickness direction of the flat battery element 20 inside the exterior film 10.
  • the negative electrode lead 40 includes lead portions 40A and 40B.
  • the lead portion 40A is a portion extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K2.
  • the lead portion 40B is an opposing portion that extends in the thickness direction of the battery element 20 that intersects the extending direction of the lead portion 40A while facing the battery element 20 inside the exterior film 10.
  • the lead portion 40B has a lower surface N1, an upper surface N2, and a side surface N3.
  • the lower surface N1 is a surface (opposing surface) on which the lead portion 40B faces the battery element 20.
  • the upper surface N2 is a surface (opposite surface) on the opposite side of the lower surface N1.
  • the side surface N3 is a surface located between the lower surface N1 and the upper surface N2 and connected to each of the lower surface N1 and the upper surface N2.
  • the lower surface N1 of the lead portion 40B may be parallel to the upper surface 20M of the battery element 20, or may be inclined with respect to the upper surface 20M. good.
  • the inclination angle of the lower surface N1 with respect to the upper surface 20M is not particularly limited as long as the facing relationship between the lead portion 40B and the battery element 20 is guaranteed.
  • the negative electrode lead 40 contains a metal material such as copper as in the negative electrode current collector 22A.
  • the negative electrode lead 40 may contain the same metal material as the negative electrode current collector 22A, or may contain a metal material different from that of the negative electrode current collector 22A.
  • the plurality of positive electrode tabs 50 are a plurality of second wiring members arranged inside the exterior film 10.
  • the electric resistance (current collecting resistance) of the battery element 20 (positive electrode 21) can be further reduced.
  • FIG. 4 shows an example in which two positive electrode tabs 50 (51, 52) are provided.
  • the positive electrode tabs 50 (51, 52) can reduce the electric resistance of the battery element 20 as described above, as compared with the case where the number of positive electrode tabs 50 is one.
  • the number of positive electrode leads 30 is a plurality
  • each of the plurality of positive electrode leads 30 is individually extended from the exterior film 10 to the outside, or the plurality of positive electrode leads 30 are overlapped with each other and externally from the exterior film 10. Will be extended to.
  • the sealing structure between the positive electrode lead 30 and the exterior film 10 becomes complicated or large in size, and the reliability of the sealing structure tends to decrease, which is not preferable.
  • the number of positive electrode tabs 50 is not particularly limited and can be set arbitrarily. However, in order to reduce the electrical resistance of the battery element 20 and suppress the volume loss in the internal space of the exterior film 10, the number of positive electrode tabs 50 is 3 or less. It is preferable that the number is two or less, and more preferably two or less.
  • each of the positive electrode tabs 51 and 52 is connected to the battery element 20, specifically, is connected to the positive electrode 21 (positive electrode current collector 21A).
  • the other ends of the positive electrode tabs 51 and 52 are in contact with each other.
  • the positive electrode tabs 51 and 52 are collectively joined to the lead portion 30B of the positive electrode lead 30 by the caulking structure 53.
  • the caulking structure 53 passes through the through holes 53A penetrating both the positive electrode lead 30 and the plurality of positive electrode tabs 51 and 52, and the positive electrode lead 30 and the plurality of positive electrode tabs 51, Includes a structure in which 52s are crimped to each other. According to this, since the caulking structure 53 can connect the positive electrode lead 30 and the plurality of positive electrode tabs 51 and 52 together, the structure and manufacturing process of the secondary battery can be further simplified.
  • the positive electrode leads 30 and the plurality of positive electrode tabs 51 and 52 may be provided so as to have different thicknesses. This is because the caulking structure 53 can stably connect members having different thicknesses to each other.
  • welding methods such as resistance welding
  • the caulking structure 53 can be more preferably used when connecting the positive electrode leads 30 having different thicknesses and the plurality of positive electrode tabs 51 and 52.
  • the thicknesses of the positive electrode tabs 51 and 52 are thinner than the thickness of the positive electrode leads 30. According to this, the positive electrode leads 30 and the plurality of positive electrode tabs 51 and 52 can further suppress the volume loss in the internal space of the exterior film 10. Further, in such a case, as shown in FIG. 6, since the smaller positive electrode tabs 51 and 52 can be crimped and fixed by the thicker positive electrode lead 30, the positive electrode lead 30 and the plurality of positive electrode tabs can be fixed. The connection strength of 51 and 52 can be further increased.
  • the caulking structure 53 may have a structure in which the positive electrode lead 30 and the plurality of positive electrode tabs 51 and 52 are crimped to each other from the surface side facing the battery element 20 to the opposite surface side. That is, the caulking structure 53 may have a structure in which the positive electrode leads 30 crimp a plurality of positive electrode tabs 51 and 52 from the lower surface M1 toward the upper surface M2 and project toward the surface facing the exterior film 10.
  • the surface where burrs are generated can be the surface opposite to the surface facing the battery element 20, so that the possibility of a short circuit of the battery element 20 due to burrs can be suppressed. ..
  • the positive electrode tabs 51 and 52 are joined to each other to form a joint portion J1.
  • the joint portion J1 is a portion where the other ends of the positive electrode tabs 51 and 52 are joined to each other. As described above, the joint portion J1 is connected to one end of the positive electrode lead 30 by the caulking structure 53. Since the positive electrode lead 30 includes the lead portion 30B inside the exterior film 10, the joint portion J1 is connected to the lead portion 30B on the upper surface M2.
  • a part of the positive electrode tabs 51 and 52 (positive electrode tab 51) is bent along the surface of the lead portion 30B. Specifically, the positive electrode tab 51 is bent along the lower surface M1, the side surface M3, and the upper surface M2 in this order. As a result, the joint portion J1 is connected to the lead portion 30B on the upper surface M2.
  • the positive electrode tabs 51 and 52 have a first extending portion E1 extending in the first direction in which the lead portion 30B of the positive electrode lead 30 extends from the side connected to the battery element 20, and a first direction.
  • the second extending portion E2 extending in the second direction opposite to the above is included.
  • the positive electrode tabs 51 and 52 have the first extending portion E1 along the lower surface M1 and the second extending portion E2 along the upper surface M2, so that the first extending portion E1 and the second extending portion E2 can be formed. Since the deformation between them can be made more gentle, the possibility of breakage can be suppressed.
  • Each of the positive electrode tabs 51 and 52 contains a metal material such as aluminum as in the positive electrode current collector 21A. However, each of the positive electrode tabs 51 and 52 may contain the same metal material as the positive electrode current collector 21A, or may contain a metal material different from that of the positive electrode current collector 21A.
  • the positive electrode tabs 51 and 52 may contain metal materials different from those of the positive electrode leads 30. Since the caulking structure 53 connects the members to each other in a physical shape, it is possible to maintain the connection strength even when the forming materials of the members to be connected are different from each other. Therefore, for the positive electrode leads 30 and the positive electrode tabs 51 and 52, the forming material can be selected with priority given to the electrical characteristics.
  • each of the positive electrode tabs 51 and 52 is not particularly limited.
  • the positive electrode tab 51 is connected to the inner end (exposed portion 21AH) of the positive electrode 21 having the foil winding structure
  • the positive electrode tab 52 is the outer end (exposed) of the positive electrode 21 having the foil winding structure. It may be connected to the unit 21AH).
  • each of the positive electrode tabs 51 and 52 is attached to the positive electrode current collector 21A (exposed portion 21AH) at a position symmetrical with respect to the center of the positive electrode current collector 21A shown in FIG. 3 in the extending direction. It will be connected.
  • each of the positive electrode tabs 51 and 52 has substantially the same distance from the center position in the extending direction of the positive electrode current collector 21A to the connection position, so that the current collecting property of the positive electrode current collector 21A is improved. Can be homogenized. Therefore, the secondary battery can facilitate the charge / discharge reaction at the positive electrode 21 to proceed more uniformly.
  • the positive electrode tab 52 is connected to the positive electrode current collector 21A (exposed portion 21AH) on the right side facing the figure, but the connection position of the positive electrode tab 52 with respect to the positive electrode current collector 21A is.
  • the positive electrode tab 52 may be connected to the positive electrode current collector 21A on the left side facing the figure.
  • the positive electrode tab 52 is connected to the positive electrode current collector 21A on the right side facing FIG. 4, that is, on the side closer to the tip of one end of the positive electrode lead 30. It is preferable that the electrode is used.
  • the plurality of negative electrode tabs 60 have the same configuration as the configuration of the plurality of positive electrode tabs 50 described above. That is, the plurality of negative electrode tabs 60 are a plurality of second wiring members arranged inside the exterior film 10. By providing a plurality of negative electrode tabs 60, the electrical resistance (current collection resistance) of the battery element 20 (negative electrode 22) can be reduced.
  • FIG. 5 shows an example in which two negative electrode tabs 60 (61, 62) are provided. This is because, for the same reason as described for the two positive electrode tabs 50 (51, 52), in order to reduce the electrical resistance of the battery element 20, the negative electrode tabs are more than a plurality of negative electrode leads 40. This is because it is preferable that the number of 60 is a plurality.
  • the number of the negative electrode tabs 60 is not particularly limited and can be set arbitrarily, but for the same reason as described in the case where the number of the positive electrode tabs 50 is described, the number is preferably 3 or less, and is preferably 2 or less. Is more preferable.
  • each of the negative electrode tabs 61 and 62 is connected to the battery element 20, specifically, is connected to the negative electrode 22 (negative electrode current collector 22A).
  • the other ends of the negative electrode tabs 61 and 62 are in contact with each other.
  • the negative electrode tabs 61 and 62 are joined to each other to form a joint portion J2.
  • the joint portion J2 is a portion where the other ends of the negative electrode tabs 61 and 62 are joined to each other, and is connected to one end of the negative electrode lead 40 by a caulking structure 63 like the positive electrode tabs 51 and 52. There is. Since the caulking structure 63 is substantially the same as the caulking structure 53 in which the positive electrode leads 30 and the positive electrode tabs 51 and 52 are joined, the description thereof is omitted here. Since the negative electrode lead 40 includes the lead portion 40B inside the exterior film 10, the joint portion J2 is connected to the lead portion 40B on the upper surface N2.
  • a part of the negative electrode tabs 61 and 62 (negative electrode tab 61) is bent along the surface of the lead portion 40B. Specifically, the negative electrode tab 61 is bent along the lower surface N1, the side surface N3, and the upper surface N2 in this order. As a result, the joint portion J2 is connected to the lead portion 40B on the upper surface N2.
  • the negative electrode tabs 61 and 62 have a first extending portion F1 extending in the first direction in which the lead portion 40B of the negative electrode lead 40 extends from the side connected to the battery element 20, and a first direction.
  • the second extending portion F2 extending in the second direction opposite to the above is included.
  • the negative electrode tabs 61 and 62 are connected to the lead portion 40B on the upper surface N2 by having the first extending portion F1 along the lower surface N1 and the second extending portion F2 along the upper surface N2.
  • Each of the negative electrode tabs 61 and 62 contains a metal material such as copper as in the negative electrode current collector 22A. However, each of the negative electrode tabs 61 and 62 may contain the same metal material as the negative electrode current collector 22A, or may contain a metal material different from that of the negative electrode current collector 22A.
  • each of the negative electrode tabs 61 and 62 is not particularly limited.
  • the negative electrode tab 61 is connected to the inner end (exposed portion 22AH) of the negative electrode 22 having the foil winding structure
  • the negative electrode tab 62 is the outer end (exposed) of the negative electrode 22 having the foil winding structure. It may be connected to the unit 22AH).
  • each of the negative electrode tabs 61 and 62 extends the negative electrode current collector 22A shown in FIG. 3 for the same reason as in the case where each of the positive electrode tabs 51 and 52 and the positive electrode 21 are connected to each other.
  • the current collector 22A (exposed portion 22AH) is connected to the negative electrode current collector at a position symmetrical with respect to the center of the direction. According to this, since the negative electrode tabs 61 and 62 can make the current collecting property of the negative electrode current collector 22A more uniform, the charge / discharge reaction can proceed more uniformly in the negative electrode 22.
  • the negative electrode tab 62 is connected to the negative electrode current collector 22A (exposed portion 22AH) on the right side facing the figure, but the connection position of the negative electrode tab 62 with respect to the negative electrode current collector 22A is.
  • the negative electrode tab 62 may be connected to the negative electrode current collector 22A on the left side facing FIG. 5 as in the case where the positive electrode tab 52 is described.
  • the negative electrode tab 62 is connected to the negative electrode current collector 22A on the right side facing FIG. 5, that is, on the side closer to the tip of one end of the negative electrode lead 40. It is preferable that the electrode is used.
  • the positive electrode sealant 70 seals the opening 10K1 to prevent outside air from entering the inside of the exterior film 10. Specifically, the positive electrode sealant 70 is inserted between the exterior film 10 and the positive electrode lead 30 in the opening 10K1.
  • the positive electrode sealant 70 may be provided in a so-called tubular shape in order to cover the periphery of the positive electrode lead 30. Further, the installation range of the positive electrode sealant 70 may be extended to the outside of the exterior film 10.
  • the positive electrode sealant 70 may contain any one or more of insulating materials such as polymer materials.
  • the polymer material is polyolefin or the like having adhesion to the positive electrode lead 30.
  • the type of polyolefin is not particularly limited, and includes polyethylene, polypropylene, modified polyethylene, modified polypropylene, and the like.
  • the positive electrode sealant 70 contains a heat-sealing polymer material similar to the fusing layer, so that the opening 10K1 It is preferable that the film is heat-sealed with the exterior film 10. This is because by utilizing the heat fusion between the exterior film 10 and the positive electrode sealant 70, it is easy to seal the opening 10K1 even when the positive electrode lead 30 is present in the opening 10K1.
  • the negative electrode sealant 80 has the same configuration as the positive electrode sealant 70 described above. That is, the negative electrode sealant 80 prevents outside air from entering the inside of the exterior film 10 by sealing the opening 10K2. Specifically, the negative electrode sealant 80 is inserted between the exterior film 10 and the negative electrode lead 40 in the opening 10K2. The negative electrode sealant 80 may be provided in a so-called tubular shape in order to cover the periphery of the negative electrode lead 40. Further, the installation range of the negative electrode sealant 80 may be extended to the outside of the exterior film 10.
  • the negative electrode sealant 80 may contain any one or more of insulating materials such as polymer materials.
  • the polymer material is polyolefin or the like having adhesion to the negative electrode lead 40.
  • the type of polyolefin is not particularly limited, and includes polyethylene, polypropylene, modified polyethylene, modified polypropylene, and the like.
  • the negative electrode sealant 80 contains a heat-sealing polymer material similar to the fusing layer, so that the opening 10K2 It is preferable that the film is heat-sealed with the exterior film 10. This is because by utilizing the heat fusion between the exterior film 10 and the negative electrode sealant 80, it is easy to seal the opening 10K2 even when the negative electrode lead 40 is present in the opening 10K2.
  • the positive electrode insulating tape 90 is a first insulating member arranged inside the exterior film 10 and outside the battery element 20.
  • the positive electrode insulating tape 90 is arranged along the lower surface M1 between the lead portion 30B and a part (positive electrode tab 51) of the positive electrode tabs 50 (51, 52). Further, the positive electrode insulating tape 90 is arranged along the lower surface M1 up to between the lead portion 30B and the battery element 20.
  • the positive electrode insulating tape 90 can electrically insulate the positive electrode lead 30 from the battery element 20 (negative electrode 22) by interposing the positive electrode insulating tape 90 between the positive electrode lead 30 and the battery element 20. As a result, the positive electrode insulating tape 90 can prevent a short circuit between the positive electrode lead 30 and the battery element 20.
  • the positive electrode insulating tape 90 is arranged not only along the lower surface M1 but also along the side surface M3. According to this, the positive electrode insulating tape 90 can protect the tip of the positive electrode lead 30 (lead portion 30B), that is, the corner portion formed by the lower surface M1 and the side surface M3, which is caused by the contact with the corner portion. Therefore, it is possible to prevent the positive electrode tab 51 from being damaged.
  • the positive electrode insulating tape 90 contains any one or more of insulating materials such as polymer materials.
  • Polymer materials include polyethylene, polyethylene terephthalate and polyimide.
  • the positive electrode insulating tape 90 is adhered to the positive electrode lead 30 (lead portion 30B) and also to the positive electrode tab 51.
  • the position of the positive electrode insulating tape 90 is fixed with respect to both the lead portion 30B and the positive electrode tab 51, it is intended even when the secondary battery receives an external load such as vibration or shock. It becomes difficult to shift from the position. Therefore, in the secondary battery, the state in which the positive electrode insulating tape 90 is interposed between the lead portion 30B and the positive electrode tab 51 is easily maintained, so that the positive electrode lead 30 and the battery element 20 (negative electrode 22) are short-circuited. The possibility of occurrence can be further reduced.
  • the positive electrode insulating tape 90 may be adhered to each of the lead portion 30B and the positive electrode tab 51 via an adhesive.
  • the type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used.
  • the positive electrode insulating tape 90 may be a double-sided adhesive tape.
  • the positive electrode insulating tape 90 may be heat-sealed to each of the lead portion 30B and the positive electrode tab 51.
  • the positive electrode insulating tape 100 is a second insulating member arranged inside the exterior film 10 and outside the battery element 20.
  • the positive electrode insulating tape 100 is arranged between the joint portion J1 and the exterior film 10. By covering the caulking structure 53, the positive electrode insulating tape 100 can prevent a short circuit or damage to the battery element 20 due to the caulking structure 53.
  • the material for forming the positive electrode insulating tape 100 is the same as the material for forming the positive electrode insulating tape 90.
  • the forming material of the positive electrode insulating tape 100 may be the same as the forming material of the positive electrode insulating tape 90, or may be different from the forming material of the positive electrode insulating tape 90.
  • the positive electrode insulating tape 100 is preferably adhered to both the joint portion J1 and the exterior film 10. In such a case, since the position of the positive electrode insulating tape 100 is fixed with respect to both the joint portion J1 and the exterior film 10, it is intended even when the secondary battery receives an external load such as vibration or shock. It becomes difficult to shift from the position. Therefore, the positive electrode insulating tape 100 can more reliably prevent a short circuit or damage to the battery element 20 due to the caulking structure 53.
  • the positive electrode insulating tape 100 may be adhered to each of the joint portion J1 and the exterior film 10 via an adhesive.
  • the type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used.
  • the positive electrode insulating tape 100 may be a double-sided adhesive tape.
  • the positive electrode insulating tape 100 may be heat-sealed to each of the joint portion J1 and the exterior film 10.
  • the negative electrode insulating tape 110 has the same configuration as the positive electrode insulating tape 90 described above. That is, the negative electrode insulating tape 110 is a first insulating member arranged inside the exterior film 10 and outside the battery element 20.
  • the negative electrode insulating tape 110 is arranged along the lower surface N1 between the lead portion 40B and a part of the negative electrode tabs 60 (61, 62) (negative electrode tab 61). Further, the negative electrode insulating tape 110 is arranged along the lower surface N1 to the space between the lead portion 40B and the battery element 20.
  • the negative electrode insulating tape 110 can electrically insulate the negative electrode lead 40 from the battery element 20 (positive electrode 21) by interposing the negative electrode insulating tape 110 between the negative electrode lead 40 and the battery element 20. As a result, the negative electrode insulating tape 110 can prevent a short circuit between the negative electrode lead 40 and the battery element 20.
  • the negative electrode insulating tape 110 is arranged not only along the lower surface N1 but also along the side surface N3. According to this, the negative electrode insulating tape 110 can protect the tip of the negative electrode lead 40 (lead portion 40B), that is, the corner portion formed by the lower surface N1 and the side surface N3, and thus is caused by the contact with the corner portion. Therefore, it is possible to prevent the negative electrode tab 61 from being damaged.
  • the negative electrode insulating tape 110 contains any one or more of insulating materials such as polymer materials.
  • Polymer materials include polyethylene, polyethylene terephthalate and polyimide.
  • the negative electrode insulating tape 110 is adhered to the negative electrode lead 40 (lead portion 40B) and also to the negative electrode tab 61. In such a case, since the position of the negative electrode insulating tape 110 is fixed with respect to both the lead portion 40B and the negative electrode tab 61, the negative electrode lead 40 and the battery element are used for the same reason as described for the positive electrode insulating tape 90. The possibility of a short circuit with 20 (negative electrode 22) can be further reduced.
  • the negative electrode insulating tape 110 may be adhered to each of the lead portion 40B and the negative electrode tab 61 via an adhesive.
  • the type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used.
  • the negative electrode insulating tape 110 may be a double-sided adhesive tape.
  • the negative electrode insulating tape 110 may be heat-sealed to each of the lead portion 40B and the negative electrode tab 61.
  • the negative electrode insulating tape 120 has the same configuration as that of the positive electrode insulating tape 100 described above. That is, the negative electrode insulating tape 120 is a second insulating member arranged inside the exterior film 10 and outside the battery element 20.
  • the negative electrode insulating tape 120 is arranged between the joint portion J2 and the exterior film 10. By covering the caulking structure 63, the negative electrode insulating tape 120 can prevent a short circuit or damage to the battery element 20 due to the caulking structure 63.
  • the material for forming the negative electrode insulating tape 120 is the same as the material for forming the negative electrode insulating tape 110.
  • the material for forming the negative electrode insulating tape 120 may be the same as the material for forming the negative electrode insulating tape 110, or may be different from the material for forming the negative electrode insulating tape 110.
  • the negative electrode insulating tape 120 is preferably adhered to both the joint portion J2 and the exterior film 10. In such a case, since the position of the negative electrode insulating tape 120 is fixed with respect to both the joint portion J2 and the exterior film 10, it is caused by the caulking structure 63 for the same reason as described with respect to the positive electrode insulating tape 100. It is possible to more reliably prevent a short circuit or damage to the battery element 20.
  • the negative electrode insulating tape 120 may be adhered to each of the joint portion J2 and the exterior film 10 via an adhesive.
  • the type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used.
  • the negative electrode insulating tape 120 may be a double-sided adhesive tape.
  • the negative electrode insulating tape 120 may be heat-sealed to each of the joint portion J2 and the exterior film 10.
  • the auxiliary insulating tape 130 is arranged inside the exterior film 10 and inside the battery element 20.
  • the auxiliary insulating tape 130 electrically insulates the conductive parts from each other by being interposed between the conductive parts adjacent to each other in the battery element 20.
  • six auxiliary insulating tapes 130 are shown as an example.
  • the auxiliary insulating tapes 131 to 133 electrically insulate the positive electrode tabs 51 and 52 from the surrounding configuration.
  • the auxiliary insulating tape 131 is provided between the positive electrode tab 51 and the negative electrode current collector 22A near the end of the winding inside of the battery element 20, and extends along the positive electrode tab 51. do.
  • the auxiliary insulating tape 132 is provided between the positive electrode current collector 21A and the separator 23 near the end of the winding inside of the battery element 20, and extends along the positive electrode tab 51.
  • the auxiliary insulating tape 133 is provided between the positive electrode tab 52 and the separator 23 in the vicinity of the outer end of the battery element 20.
  • the auxiliary insulating tapes 134 to 136 electrically insulate the negative electrode tabs 61 and 62 from the surrounding configuration.
  • the auxiliary insulating tape 134 is provided between the negative electrode current collector 22A and the separator 23 near the end of the winding inside of the battery element 20, and extends along the negative electrode tab 61. ..
  • the auxiliary insulating tape 135 is provided between the negative electrode tab 61 and the positive electrode current collector 21A near the end of the winding inside of the battery element 20, and extends along the negative electrode tab 61.
  • the auxiliary insulating tape 136 is provided between the negative electrode tab 62 and the separator 23 in the vicinity of the outer end of the battery element 20.
  • Each of the auxiliary insulating tapes 131 to 136 may contain any one type or two or more types of insulating materials such as polymer materials.
  • Polymer materials include polyethylene, polyethylene terephthalate and polyimide.
  • the positive electrode active material is mixed with a positive electrode binder and a positive electrode conductive agent as needed to form a positive electrode mixture, and then the positive electrode mixture is added to an organic solvent or the like to form a paste-like positive electrode.
  • the positive electrode active material layer 21B is formed by applying the positive electrode mixture slurry on both sides of the positive electrode current collector 21A.
  • the positive electrode active material layer 21B may be subsequently compression-molded using a roll press or the like. Further, the positive electrode active material layer 21B may be heated or may be repeatedly compression-molded a plurality of times. As a result, the positive electrode 21 in which the positive electrode active material layers 21B are formed on both sides of the positive electrode current collector 21A is produced.
  • the negative electrode active material layers 22B are formed on both sides of the negative electrode current collector 22A by the same procedure as the procedure for manufacturing the positive electrode 21 described above. Specifically, the negative electrode active material is mixed with a negative electrode binder and a negative electrode conductive agent as needed to form a negative electrode mixture, and then the negative electrode mixture is added to an organic solvent or the like to make a paste. Prepare a negative electrode mixture slurry. Next, the negative electrode active material layer 22B is formed by applying the negative electrode mixture slurry on both sides of the negative electrode current collector 22A. The negative electrode active material layer 22B may then be compression molded. As a result, the negative electrode 22 in which the negative electrode active material layers 22B are formed on both sides of the negative electrode current collector 22A is produced.
  • An electrolytic solution is prepared by adding an electrolyte salt to a solvent and dispersing or dissolving the electrolyte salt in the solvent.
  • the positive electrode tabs 51 and 52 are connected to the positive electrode 21 (positive electrode current collector 21A) and the negative electrode tabs 61 and 62 are connected to the negative electrode 22 (negative electrode current collector 22A) by using a welding method or the like.
  • a welding method any one or more of the laser welding method and the resistance welding method can be used.
  • the positive electrode 21 and the negative electrode 22 are alternately laminated via the separator 23, and then the laminated body of the positive electrode 21, the negative electrode 22 and the separator 23 is wound to produce the battery element 20.
  • the auxiliary insulating tape 130 is inserted at an appropriate position during winding.
  • each of the positive electrode tabs 51 and 52 is connected to one end of the positive electrode lead 30 (lead portion 30B) by the caulking structure 53.
  • one end of each of the positive electrode tabs 51 and 52 and one end of the positive electrode lead 30 (lead portion 30B) are overlapped with each other, and then penetrate the positive electrode tabs 51 and 52 and the positive electrode lead 30.
  • the hole 53A is formed.
  • a part of the positive electrode lead 30 is folded back to the positive electrode tabs 51 and 52 side through the through hole 53A, and the positive electrode tabs 51 and 52 are crimped to form the crimping structure 53.
  • FIGS. 7A to 7C are schematic views showing first to third examples of the caulking structure 53.
  • a plurality of caulking structures 53 may be provided side by side in a direction orthogonal to the longitudinal direction of the positive electrode leads 30 and the positive electrode tabs 51 and 52.
  • the caulking structure 53 can connect the positive electrode lead 30 and the positive electrode tabs 51 and 52 more firmly. Therefore, the secondary battery can further reduce the possibility of breaking the internal wiring due to an external load.
  • the size of the through hole 53A for forming the caulking structure 53 may be 0.5 mm or more. In such a case, a part of the positive electrode leads 30 can be folded back toward the positive electrode tabs 51 and 52 through the through hole 53A, and the positive electrode tabs 51 and 52 can be crimped more easily.
  • the shape of the through hole 53A for forming the caulking structure 53 is preferably polygonal.
  • the shape of the through hole 53A may be a quadrangle as shown in FIG. 7A, a pentagon as shown in FIG. 7B, or a hexagon as shown in FIG. 7C. good.
  • the caulking structure 53 when a part of the positive electrode lead 30 is folded back to the positive electrode tabs 51 and 52 side through the through hole 53A, the folded positive electrode lead 30 is prevented from rising and forming a protrusion. can do.
  • the caulking structure 53 can further reduce the possibility of damaging other configurations by an external load, the possibility of short-circuiting or breaking of the internal wiring due to the external load can be further reduced. can.
  • the negative electrode leads 40 and the negative electrode tabs 61 and 62 are also connected by the caulking structure 63 in the same manner as the positive electrode leads 30 and the positive electrode tabs 51 and 52. Specifically, the caulking structure 63 connects one end of each of the negative electrode tabs 61 and 62 to one end of the negative electrode lead 40 (lead portion 40B). Since the caulking structure 63 is substantially the same as the caulking structure 53, the description thereof is omitted here.
  • the positive electrode wiring 200 (positive electrode lead 30 and positive electrode tabs 51 and 52) and the negative electrode wiring 300 (negative electrode lead 40 and negative electrode tabs 61 and 62) are connected to the battery element 20, respectively.
  • the battery element 20 to which the positive electrode wiring 200 and the negative electrode wiring 300 are connected is housed inside the exterior film 10.
  • the positive electrode tab 51 is bent along the lower surface M1, the side surface M3, and the upper surface M2 of the lead portion 30B in order
  • the negative electrode tab 61 is bent along the lower surface N1, the side surface N3, and the upper surface N2 of the lead portion 40B in order.
  • the positive electrode insulating tape 90 is adhered to each of the lead portion 30B and the positive electrode tab 51.
  • the negative electrode insulating tape 110 is adhered to each of the lead portion 40B and the negative electrode tab 61.
  • the positive electrode insulating tape 100 is adhered to each of the joint portion J1 and the exterior film 10.
  • the negative electrode insulating tape 120 is adhered to each of the joint portion J2 and the exterior film 10.
  • the exterior films 10 facing each other at the openings are joined to each other by a heat fusion method.
  • the positive electrode sealant 70 is inserted between the exterior film 10 and the positive electrode wiring 200 at the opening 10K1
  • the negative electrode sealant 80 is inserted between the exterior film 10 and the negative electrode wiring 300 at the opening 10K2.
  • the opening 10K1 is sealed via the positive electrode sealant 70
  • the opening 10K2 is sealed via the negative electrode sealant 80.
  • the battery element 20 is enclosed inside the exterior film 10, and the positive electrode wiring 200 and the negative electrode wiring 300 electrically connected to the battery element 20, respectively, are laminated film type two protruding from the exterior film 10 to the outside. The next battery is completed.
  • the battery element 20 is housed inside the flexible exterior film 10, and the positive electrode wiring 200 (positive electrode lead 30) extending from the inside to the outside of the exterior film 10 is the battery element.
  • the lead portion 30B facing the 20 is included.
  • Positive electrode tabs 51 and 52 are arranged inside the exterior film 10, and one end of each of the positive electrode tabs 51 and 52 is connected to the battery element 20 (positive electrode 21) and the other end of each is crimped. It is connected to the lead portion 30B by the structure 53.
  • the secondary battery since the lead portion 30B and the positive electrode tabs 51 and 52 are connected by the caulking structure 53, the connection strength between the lead portion 30B and the positive electrode tabs 51 and 52 is strong. Can be further enhanced. Therefore, the secondary battery can prevent the internal wiring including the lead portion 30B and the positive electrode tabs 51 and 52 from being broken by an external load.
  • the caulking structure 53 is stable without using welding or the like under complicated conditions. It is possible to form a connection.
  • the secondary battery according to the present embodiment can further increase the connection strength between the lead portion 30B and the positive electrode tabs 51 and 52.
  • the caulking structure 53 crimps the lead portion 30B and the positive electrode tabs 51 and 52 to each other through a through hole penetrating both the lead portion 30B and the positive electrode tabs 51 and 52, these wirings can be connected together. can. Therefore, since the structure of the secondary battery according to the present embodiment can be further simplified, the volume loss inside the exterior film 10 can be further reduced.
  • burrs due to the caulking structure 53 may be formed on the exterior film 10 side. can. Therefore, in the secondary battery according to the present embodiment, burrs due to the caulking structure 53 are not formed on the battery element 20 side, so that the possibility of a short circuit occurring in the battery element 20 can be reduced.
  • the secondary battery according to the present embodiment can further reduce the volume loss inside the exterior film 10 and reduce the possibility of a short circuit occurring.
  • the caulking structure 53 can stably form a connection.
  • the lead portion 30B extends in the first direction in the thickness direction of the battery element 20 so as to face the battery element 20, and the positive electrode tabs 51 and 52 extend in the first direction.
  • the second extending portion E2 extending in the second direction opposite to the first direction may be included.
  • the positive electrode tabs 51 and 52 extend the first extending portion E1 along the lower surface M1 of the lead portion 30B, and extend the second extending portion E2 along the upper surface M2 of the lead portion 30B. It can be postponed. According to this, since the deformation of the positive electrode tabs 51 and 52 from the first extending portion E1 to the second extending portion E2 becomes gentle, the positive electrode tabs 51 and 52 can be broken when an external load is generated. The sex can be further reduced.
  • the positive electrode insulating tape 90 is arranged between the lead portion 30B and the positive electrode tab 51, the positive electrode insulating tape 90 is less likely to shift from the intended position when the secondary battery receives an external load, so that the lead portion The occurrence of a short circuit between the 30B and the battery element 20 can be further reduced.
  • the positive electrode insulating tape 90 is arranged along the side surface M3 in addition to the lower surface M1 of the lead portion 30B, the positive electrode tab 51 is less likely to be damaged, so that the secondary battery according to the present embodiment is external. The possibility of a short circuit occurring when a load is generated can be further reduced.
  • the positive electrode insulating tape 100 when the positive electrode insulating tape 100 is arranged between the joint portion J1 and the exterior film 10, the positive electrode insulating tape 100 covers the caulking structure 53 to cause a short circuit or damage to the battery element 20 due to the caulking structure 53. Can be prevented. Therefore, the secondary battery according to the present embodiment can further reduce the possibility of a short circuit occurring when an external load is generated.
  • the current collecting resistance of the battery element 20 can be reduced by increasing the number of positive electrode tabs 50, so that a higher effect can be obtained.
  • the secondary battery is a lithium ion secondary battery
  • a higher effect can be obtained because a sufficient battery capacity can be stably obtained by utilizing the storage and release of lithium.
  • each of the negative electrode wiring 300 (negative electrode lead 40 and the plurality of negative electrode tabs 60) and the negative electrode insulating tape 110 has the same configuration as each of the positive electrode wiring 200 and the positive electrode insulating tape 90. doing. Therefore, the same action and effect can be obtained for each of the negative electrode wiring 300 and the negative electrode insulating tape 110.
  • the secondary battery may have a different connection mode between the positive electrode lead 30 (lead portion 30B) and the joint portion J1.
  • FIG. 8 is a cross-sectional view showing a cross-sectional configuration of the secondary battery according to the modified example.
  • the positive electrode tab 51 may be bent so as to be folded along only the lower surface M1.
  • the joint portion J1 is provided on the lower surface M1 of the lead portion 30B. Even in such a case, the positive electrode tabs 51 and 52 can be connected to the positive electrode lead 30 by the caulking structure 53.
  • the negative electrode tab 61 may be bent so as to be folded along only the lower surface N1.
  • the secondary battery includes both the positive electrode insulating tape 90 and the negative electrode insulating tape 110.
  • the secondary battery may include only one of the positive electrode insulating tape 90 and the negative electrode insulating tape 110. Even in this case, the secondary battery can suppress the occurrence of a short circuit as compared with the case where both the positive electrode insulating tape 90 and the negative electrode insulating tape 110 are not provided.
  • the secondary battery in order to sufficiently prevent the occurrence of a short circuit and to perform the charging / discharging operation of the secondary battery more stably, the secondary battery must include both the positive electrode insulating tape 90 and the negative electrode insulating tape 110. preferable.
  • the positive electrode insulating tape 90 is arranged along the lower surface M1 from between the lead portion 30B and the positive electrode tab 51 to between the lead portion 30B and the battery element 20.
  • the installation range of the positive electrode insulating tape 90 is not particularly limited as long as it is arranged along the lower surface M1. Even in this case, since the lead portion 30B is insulated from the surroundings via the positive electrode insulating tape 90, the same effect can be obtained. However, in order to sufficiently insulate the lead portion 30B from the surroundings in a wider range, it is preferable that the installation range of the positive electrode insulating tape 90 is as wide as possible.
  • the installation range of the negative electrode insulating tape 110 is not particularly limited as long as it is arranged along the lower surface N1.
  • the positive electrode insulating tape 90 is adhered to both the lead portion 30B and the positive electrode tab 51.
  • the positive electrode insulating tape 90 may be adhered to only one of the lead portion 30B and the positive electrode tab 51. Even in this case, since the positive electrode insulating tape 90 is fixed to the lead portion 30B or the positive electrode tab 51, the same effect can be obtained. However, in order to sufficiently fix the positive electrode insulating tape 90, it is preferable that the positive electrode insulating tape 90 is adhered to both the lead portion 30B and the positive electrode tab 51.
  • the negative electrode insulating tape 110 may be adhered to only one of the lead portion 40B and the negative electrode tab 61.
  • the secondary battery includes both the positive electrode insulating tape 100 and the negative electrode insulating tape 120.
  • the secondary battery may include only one of the positive electrode insulating tape 100 and the negative electrode insulating tape 120. Even in this case, the secondary battery can suppress the occurrence of a short circuit as compared with the case where both the positive electrode insulating tape 100 and the negative electrode insulating tape 120 are not provided.
  • the secondary battery in order to sufficiently prevent the occurrence of a short circuit and to perform the charging / discharging operation of the secondary battery more stably, the secondary battery must include both the positive electrode insulating tape 100 and the negative electrode insulating tape 120. preferable.
  • the secondary battery does not have to include both the positive electrode insulating tape 100 and the negative electrode insulating tape 120. Even in this case, if the secondary battery includes one or both of the positive electrode insulating tape 90 and the negative electrode insulating tape 110, a short circuit between the positive electrode lead 30 or the negative electrode lead 40 and the battery element 20 can be prevented. be able to.
  • the secondary battery includes one or both of the positive electrode insulating tape 100 and the negative electrode insulating tape 120.
  • the positive electrode insulating tape 100 is adhered to both the joint portion J1 and the exterior film 10.
  • the positive electrode insulating tape 100 may be adhered to only one of the joint portion J1 and the exterior film 10. Even in this case, since the positive electrode insulating tape 100 is fixed to the joint portion J1 or the exterior film 10, the same effect can be obtained. However, in order to sufficiently fix the positive electrode insulating tape 100, it is preferable that the positive electrode insulating tape 100 is adhered to both the joint portion J1 and the exterior film 10.
  • the negative electrode insulating tape 120 may be adhered to only one of the joint portion J2 and the exterior film 10.
  • the number of positive electrode tabs 50 is two (positive electrode tabs 51 and 52), and in FIG. 5, the number of negative electrode tabs 60 is two (negative electrode tabs 61 and 62).
  • the number of positive electrode tabs 50 is not particularly limited as long as it is plural, and may be three or more.
  • the number of negative electrode tabs 60 is not particularly limited as long as it is plural, and may be three or more. In these cases, the same effect can be obtained.
  • the electrical resistance (collection resistance) of the secondary battery (battery element 20) decreases, so that the battery characteristics of the secondary battery can be further improved.
  • the effect caused by the decrease in the electric resistance of the secondary battery (battery element 20) can be similarly obtained even when the number of negative electrode tabs 60 is increased.
  • the separator 23 has been described as being a porous membrane.
  • the separator 23 may be a laminated film containing a polymer compound layer.
  • the separator 23 includes the above-mentioned porous film base material layer and the polymer compound layer provided on one side or both sides of the base material layer.
  • the polymer compound layer contains a polymer compound such as polyvinylidene fluoride, which has excellent physical strength and is electrochemically stable. According to this, since the separator 23 can improve the adhesion to each of the positive electrode 21 and the negative electrode 22, it is possible to suppress the misalignment inside the battery element 20. Therefore, the secondary battery can suppress the occurrence of swelling even when the decomposition reaction of the electrolytic solution occurs.
  • the base material layer and the polymer compound layer may contain a plurality of particles.
  • the plurality of types of particles may be any one type or two or more types of particles such as inorganic particles and resin particles. According to this, since the secondary battery can dissipate heat with a plurality of particles when it generates heat, heat resistance and safety can be improved.
  • the inorganic particles are not particularly limited, but are particles such as aluminum oxide (alumina), aluminum nitride, boehmite, silicon oxide (silica), titanium oxide (titania), magnesium oxide (magnesia) and zirconium oxide (zirconia).
  • the separator 23 of the laminated film containing the polymer compound layer can be prepared by preparing a precursor solution containing the polymer compound, an organic solvent, etc., and then applying the precursor solution to one or both sides of the base material layer. can.
  • lithium can move between the positive electrode 21 and the negative electrode 22, so that the secondary battery can obtain the same effect.
  • the electrolyte has been described as being a liquid electrolyte.
  • the electrolyte may be a gel-like electrolyte layer.
  • the positive electrode 21 and the negative electrode 22 are laminated with each other via the separator 23 and the electrolyte layer, and then the positive electrode 21, the negative electrode 22, the separator 23 and the electrolyte layer are wound around. .. According to this, the electrolyte layer is interposed between the positive electrode 21 and the separator 23, and is interposed between the negative electrode 22 and the separator 23.
  • the electrolyte layer contains a polymer compound together with the electrolyte solution, and the electrolyte solution is held by the polymer compound.
  • the composition of the electrolytic solution is as described above.
  • the polymer compound contains polyvinylidene fluoride and the like.
  • the electrolyte layer can be formed by preparing a precursor solution containing an electrolytic solution, a polymer compound, an organic solvent, or the like, and then applying the precursor solution to one or both sides of each of the positive electrode 21 and the negative electrode 22.
  • lithium can move between the positive electrode 21 and the negative electrode 22 via the electrolyte layer, so that the secondary battery can obtain the same effect.
  • the lead portion 30A extends in a direction intersecting the extending direction of the lead portion 30B.
  • the negative electrode lead 40 does not have to be bent. Even in this case, since the negative electrode tabs 61 and 62 can be connected to the lead portion 40B, the secondary battery can obtain the same effect.
  • the positive electrode tab 50 and the positive electrode current collector 21A are separate from each other, but the positive electrode tab 50 and the positive electrode current collector 21A may be provided integrally with each other. Specifically, in the step of forming the positive electrode current collector 21A using the punching process of the metal foil, the metal foil is punched so that the positive electrode tab 50 and the positive electrode current collector 21A have a shape integrated with each other. , The positive electrode current collector 21A integrated with the positive electrode tab 50 can be formed. Even in this case, since the positive electrode tab 50 can be connected to the lead portion 30B, the secondary battery can obtain the same effect.
  • the negative electrode tab 60 and the negative electrode current collector 22A may be provided integrally with each other. Even in this case, since the negative electrode tab 60 can be connected to the lead portion 40B, the secondary battery can obtain the same effect.
  • Secondary batteries are mainly used in machines, devices, appliances, devices and systems (aggregates of multiple devices, etc.) that use secondary batteries as a power source for driving or a power storage source for storing power. If there is, there is no particular limitation.
  • the secondary battery used as a power source may be a main power source or an auxiliary power source.
  • the main power source is a power source that is preferentially used regardless of the presence or absence of another power source.
  • Auxiliary power supplies are power supplies that are used in place of the main power supply or that can be switched from the main power supply as needed.
  • the type of main power source is not limited to the secondary battery.
  • Specific examples of applications for secondary batteries include electronic devices such as video cameras, digital still cameras, mobile phones, laptop computers, cordless phones, headphone stereos, portable radios, portable TVs, and portable information terminals (portable electronic devices). (Including equipment).
  • Specific examples of applications for secondary batteries include portable household appliances such as electric shavers, storage devices such as backup power supplies and memory cards, electric tools such as electric drills and electric saws, and notebook personal computers as removable power supplies. Battery packs installed in such devices, medical electronic devices such as pacemakers and hearing aids, electric vehicles such as electric vehicles (including hybrid vehicles), and household battery systems that store power in case of an emergency. It is a power storage system.
  • the battery structure of the secondary battery may be the above-mentioned laminated film type or cylindrical type, or may be another battery structure other than these. Further, by using a plurality of secondary batteries, it may be used as a battery pack, a battery module, or the like.
  • the battery pack and battery module are applied to relatively large equipment such as electric vehicles, power storage systems and electric tools.
  • the battery pack a single battery or an assembled battery may be used.
  • the electric vehicle is a vehicle that operates (runs) using a secondary battery as a driving power source, and may be a vehicle (hybrid vehicle or the like) that also has a drive source other than the secondary battery as described above.
  • the power storage system is a system that uses a secondary battery as a power storage source. In a household power storage system, power is stored in a secondary battery, which is a power storage source, so that the stored power can be used to use household electrical products and the like.
  • the configuration of the application example described below is just an example, and can be changed as appropriate.
  • the type of the secondary battery used in the following application examples is not particularly limited, and may be a laminated film type or a cylindrical type.
  • FIG. 9 is a block diagram showing a block configuration of a battery pack using a cell.
  • the battery pack described here is a simple battery pack (so-called soft pack) using one secondary battery, and is mounted on an electronic device represented by a smartphone.
  • the battery pack includes a power supply 410 and a circuit board 420.
  • the circuit board 420 is connected to the power supply 410 and includes a positive electrode terminal 210, a negative electrode terminal 310, and a temperature detection terminal (so-called T terminal) 430.
  • the power supply 410 includes one secondary battery.
  • the positive electrode wiring 200 is connected to the positive electrode terminal 210
  • the negative electrode wiring 300 is connected to the negative electrode terminal 310. Since the power supply 410 can be connected to the outside via the positive electrode terminal 210 and the negative electrode terminal 310, it can be charged and discharged via the positive electrode terminal 210 and the negative electrode terminal 310.
  • the circuit board 420 includes a control unit 440, a switch 450, a PTC element 460, and a temperature detection unit 470. However, the PTC element 460 may be omitted.
  • the control unit 440 includes a central processing unit (CPU: Central Processing Unit), a memory, and the like, and controls the operation of the entire battery pack.
  • the control unit 440 detects and controls the usage state of the power supply 410 as needed.
  • the control unit 440 disconnects the switch 450 so that the charging current does not flow in the current path of the power supply 410. do. Further, the control unit 440 cuts off the charging current by cutting off the switch 450 when a large current flows during charging or discharging.
  • the overcharge detection voltage and the overdischarge detection voltage are not particularly limited. As an example, the overcharge detection voltage is 4.2V ⁇ 0.05V, and the overdischarge detection voltage is 2.4V ⁇ 0.1V.
  • the switch 450 includes a charge control switch, a discharge control switch, a charging diode, a discharging diode, and the like, and switches the connection between the power supply 410 and the external device according to the instruction of the control unit 440.
  • the switch 450 includes a field effect transistor (MOSFET: Metal-Oxide-Semiconductor Field-Effect Transistor) using a metal oxide semiconductor, and the charge / discharge current is detected based on the ON resistance of the switch 450.
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • the temperature detection unit 470 includes a temperature detection element such as a thermistor, measures the temperature of the power supply 410 using the temperature detection terminal 430, and outputs the temperature measurement result to the control unit 440.
  • the temperature measurement result measured by the temperature detection unit 470 is used when the control unit 440 performs charge / discharge control when abnormal heat generation occurs, or when the control unit 440 performs correction processing when calculating the remaining capacity.
  • the element structure of the electronic element is a wound type (wound electrode body)
  • electrodes positive electrode and negative electrode
  • Other element structures such as a laminated type (laminated electrode body) and a ninety-nine-fold type in which the electrodes (positive electrode and negative electrode) are folded in a zigzag manner may be used.
  • the electrode reactant is not particularly limited. Specifically, as described above, the electrode reactant may be another alkali metal such as sodium and potassium, or an alkaline earth metal such as beryllium, magnesium and calcium. In addition, the electrode reactant may be another light metal such as aluminum.

Landscapes

  • 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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

This secondary battery comprises: a flexible outer packaging member; a battery element that is accommodated inside the outer packaging member and has a flat shape; a first wiring member that extends from the inside of the outer packaging member to the outside; and a plurality of second wiring members disposed inside the outer packaging member. The first wiring member includes a facing part that faces the battery element, and the facing part extends in the thickness direction of the flat shape on the inside of the outer packaging member. One end part of each of the plurality of second wiring members is connected to the battery element, and the other end part of each of the plurality of second wiring members is connected to at least one crimped structure provided to the facing part of the first wiring member.

Description

二次電池Rechargeable battery
　本技術は、二次電池に関する。 This technology is related to secondary batteries.
　携帯電話機などの多様な電子機器の普及に伴って、小型、軽量および高エネルギー密度の電源として二次電池の開発が進められている。二次電池の各構成は、電池特性に影響を及ぼすため、様々な検討が行われている。 With the spread of various electronic devices such as mobile phones, the development of secondary batteries is being promoted as a power source of small size, light weight and high energy density. Since each configuration of the secondary battery affects the battery characteristics, various studies have been conducted.
　一例を挙げると、ラミネートフィルムなどの外装部材を用いた二次電池では、各種目的を達成するために、タブ（またはリード）の形状および封止構造などを適正化することが検討されている（例えば、特許文献１，２参照）。 As an example, in a secondary battery using an exterior member such as a laminated film, it is considered to optimize the shape of the tab (or lead) and the sealing structure in order to achieve various purposes ( For example, see Patent Documents 1 and 2).
特開２０１０－１５７４８４号公報Japanese Unexamined Patent Publication No. 2010-157484 特開２００５－３５３５２０号公報Japanese Unexamined Patent Publication No. 2005-353520
　上記のように様々な検討が行われているものの、外的負荷に起因する二次電池の内部配線の破断は、未だ十分抑制されておらず、改善の余地がある。 Although various studies have been conducted as described above, the breakage of the internal wiring of the secondary battery due to the external load has not yet been sufficiently suppressed, and there is room for improvement.
　本技術は、かかる問題点に鑑みてなされたものであり、その目的は、外部負荷に起因する内部配線の破断を抑制することが可能な二次電池を提供することにある。 This technology was made in view of such problems, and its purpose is to provide a secondary battery capable of suppressing breakage of internal wiring due to an external load.
　本技術の一実施形態に係る二次電池は、可撓性を有する外装部材と、外装部材の内部に収納され、扁平形状を有する電池素子と、外装部材の内部から外部まで延在する第１配線部材と、外装部材の内部に配置された複数の第２配線部材とを備え、第１配線部材は、電池素子に対向する対向部を含み、対向部は、外装部材の内部にて扁平形状の厚み方向に延在し、複数の第２配線部材のそれぞれの一端部は、電池素子に接続され、複数の第２配線部材のそれぞれの他端部は、第１配線部材の対向部に設けられた少なくとも１つのかしめ構造にて接続されているものである。 The secondary battery according to an embodiment of the present technology includes a flexible exterior member, a battery element housed inside the exterior member and having a flat shape, and a first battery element extending from the inside to the outside of the exterior member. A wiring member and a plurality of second wiring members arranged inside the exterior member are provided, the first wiring member includes a facing portion facing the battery element, and the facing portion has a flat shape inside the exterior member. One end of each of the plurality of second wiring members is connected to the battery element, and the other end of each of the plurality of second wiring members is provided on the opposite portion of the first wiring member. It is connected by at least one crimped structure.
　本技術の一実施形態に係る二次電池によれば、可撓性を有する外装部材の内部に電池素子が収納されており、外装部材の内部から外部まで延在する第１配線部材とかしめ構造にて接続され、外装部材の内部に配置された第２配線部材に電池素子が接続されている。よって、外的負荷に起因する二次電池の内部配線の破断が抑制される。 According to the secondary battery according to the embodiment of the present technology, the battery element is housed inside the flexible exterior member, and the first wiring member and the caulking structure extend from the inside to the outside of the exterior member. The battery element is connected to the second wiring member arranged inside the exterior member. Therefore, the breakage of the internal wiring of the secondary battery due to the external load is suppressed.
　なお、本技術の効果は、必ずしもここで説明された効果に限定されるわけではなく、後述する本技術に関連する一連の効果のうちのいずれの効果でもよい。 Note that the effect of the present technology is not necessarily limited to the effect described here, and may be any effect of a series of effects related to the present technology described later.
本技術の一実施形態に係る二次電池の外観構成を示す斜視図である。It is a perspective view which shows the appearance structure of the secondary battery which concerns on one Embodiment of this technique. 図１に示した電池素子の外観構成を示す斜視図である。It is a perspective view which shows the appearance structure of the battery element shown in FIG. 正極および負極のそれぞれの断面構成を示す断面図である。It is sectional drawing which shows the cross-sectional structure of each of a positive electrode and a negative electrode. 図１に示した二次電池の断面構成を示す断面図である。It is sectional drawing which shows the sectional structure of the secondary battery shown in FIG. 図１に示した二次電池の他の断面構成を示す断面図である。It is sectional drawing which shows the other sectional structure of the secondary battery shown in FIG. かしめ構造の断面構成を示す断面図である。It is sectional drawing which shows the cross-sectional structure of the caulking structure. かしめ構造の第１の例を示す模式図である。It is a schematic diagram which shows the 1st example of the caulking structure. かしめ構造の第２の例を示す模式図である。It is a schematic diagram which shows the 2nd example of the caulking structure. かしめ構造の第３の例を示す模式図である。It is a schematic diagram which shows the 3rd example of a caulking structure. 変形例に係る二次電池の断面構成を示す断面図である。It is sectional drawing which shows the sectional structure of the secondary battery which concerns on the modification. 二次電池の適用例（電池パック：単電池）の構成を示すブロック図である。It is a block diagram which shows the structure of the application example (battery pack: cell) of a secondary battery.
　以下、本技術に係る一実施形態に関して、図面を参照しながら詳細に説明する。なお、説明する順序は、以下のとおりである。

　１．二次電池
　　　１－１．構成
　　　１－２．動作
　　　１－３．製造方法
　　　１－４．作用および効果
　２．変形例
　３．二次電池の用途
Hereinafter, one embodiment according to the present technology will be described in detail with reference to the drawings. The order of explanation is as follows.

1. 1. Secondary battery 1-1. Configuration 1-2. Operation 1-3. Manufacturing method 1-4. Action and effect 2. Modification example 3. Applications for secondary batteries
＜１．二次電池＞
　まず、本技術の一実施形態に係る二次電池について説明する。 <1. Rechargeable battery ＞
First, a secondary battery according to an embodiment of the present technology will be described.
　ここで説明する二次電池は、電極反応物質の吸蔵放出を利用して電池容量を得る二次電池であり、正極、負極および電解液を備えている。二次電池では、充電途中に負極の表面に電極反応物質が析出することを防止するために、負極の充電容量は、正極の放電容量よりも大きくなっている。すなわち、負極の単位面積当たりの電気化学容量は、正極の単位面積当たりの電気化学容量よりも大きくなっている。 The secondary battery described here is a secondary battery that obtains battery capacity by using the occlusion and release of an electrode reactant, and includes a positive electrode, a negative electrode, and an electrolytic solution. In the secondary battery, the charge capacity of the negative electrode is larger than the discharge capacity of the positive electrode in order to prevent the electrode reactant from depositing on the surface of the negative electrode during charging. That is, the electrochemical capacity per unit area of the negative electrode is larger than the electrochemical capacity per unit area of the positive electrode.
　電極反応物質は、特に限定されないが、アルカリ金属およびアルカリ土類金属などの軽金属である。アルカリ金属は、リチウム、ナトリウムおよびカリウムなどである。アルカリ土類金属は、ベリリウム、マグネシウムおよびカルシウムなどである。 The electrode reactant is not particularly limited, but is a light metal such as an alkali metal and an alkaline earth metal. Alkali metals include lithium, sodium and potassium. Alkaline earth metals include beryllium, magnesium and calcium.
　以下では、電極反応物質がリチウムである場合を例に挙げる。リチウムの吸蔵放出を利用して電池容量を得る二次電池は、いわゆるリチウムイオン二次電池であり、リチウムイオン二次電池では、リチウムがイオン状態で吸蔵および放出される。 In the following, the case where the electrode reactant is lithium will be taken as an example. A secondary battery that obtains battery capacity by using the storage and release of lithium is a so-called lithium ion secondary battery, and in a lithium ion secondary battery, lithium is stored and released in an ionic state.
＜１－１．構成＞
　図１は、本技術の一実施形態に係る二次電池の構成を示す斜視図である。図２は、図１に示した電池素子２０の構成を示す斜視図である。図３は、正極２１および負極２２のそれぞれの構成を示す断面図である。図４および図５は、図１に示した二次電池の構成を示す断面図である。図６は、正極リード３０および複数の正極タブ５０を接続するかしめ構造５３の具体的な構成を示す断面図である。なお、図３では、互いに共通する構成を有する正極２１および負極２２をまとめて示している。図４では、図１のＡ－Ａ線に沿った断面を示し、図５では、図１のＢ－Ｂ線に沿った断面を示している。 <1-1. Configuration>
FIG. 1 is a perspective view showing a configuration of a secondary battery according to an embodiment of the present technology. FIG. 2 is a perspective view showing the configuration of the battery element 20 shown in FIG. FIG. 3 is a cross-sectional view showing the respective configurations of the positive electrode 21 and the negative electrode 22. 4 and 5 are cross-sectional views showing the configuration of the secondary battery shown in FIG. FIG. 6 is a cross-sectional view showing a specific configuration of a caulking structure 53 connecting a positive electrode lead 30 and a plurality of positive electrode tabs 50. In addition, in FIG. 3, the positive electrode 21 and the negative electrode 22 having a configuration common to each other are shown together. FIG. 4 shows a cross section along the line AA of FIG. 1, and FIG. 5 shows a cross section along the line BB of FIG.
　以下の説明では、図４および図５に正対して上下方向を二次電池の高さ方向とし、左右方向を二次電池の厚み方向とする。また、二次電池の高さ方向において、図４および図５に正対して上方向を二次電池の上側とし、下方向を二次電池の下側とする。 In the following description, the vertical direction is the height direction of the secondary battery and the left-right direction is the thickness direction of the secondary battery, facing FIGS. 4 and 5. Further, in the height direction of the secondary battery, the upward direction facing FIGS. 4 and 5 is the upper side of the secondary battery, and the lower direction is the lower side of the secondary battery.
　二次電池は、図１～図５に示すように、外装フィルム１０と、電池素子２０と、正極配線２００と、負極配線３００と、正極シーラント７０と、負極シーラント８０と、正極絶縁テープ９０，１００と、負極絶縁テープ１１０，１２０と、補助絶縁テープ１３０とを備えている。正極配線２００は、正極リード３０および複数の正極タブ５０を含み、かつ負極配線３００は、負極リード４０および複数の負極タブ６０を含んでいる。 As shown in FIGS. 1 to 5, the secondary battery includes an exterior film 10, a battery element 20, a positive electrode wiring 200, a negative electrode wiring 300, a positive electrode sealant 70, a negative electrode sealant 80, and a positive electrode insulating tape 90. It includes 100, negative electrode insulating tapes 110 and 120, and auxiliary insulating tape 130. The positive electrode wiring 200 includes a positive electrode lead 30 and a plurality of positive electrode tabs 50, and the negative electrode wiring 300 includes a negative electrode lead 40 and a plurality of negative electrode tabs 60.
　二次電池では、外装フィルム１０の内部に電池素子２０が収納されていると共に、電池素子２０に正極配線２００および負極配線３００が接続されている。正極配線２００および負極配線３００の各々は、外装フィルム１０の内部から外部に向かって互いに共通する方向に延在されている。 In the secondary battery, the battery element 20 is housed inside the exterior film 10, and the positive electrode wiring 200 and the negative electrode wiring 300 are connected to the battery element 20. Each of the positive electrode wiring 200 and the negative electrode wiring 300 extends from the inside to the outside of the exterior film 10 in a direction common to each other.
　すなわち、本実施形態に係る二次電池は、電池素子２０を収納するための外装部材として外装フィルム１０を用いたラミネートフィルム型の二次電池である。二次電池は、扁平な立体的形状を有している。 That is, the secondary battery according to the present embodiment is a laminated film type secondary battery in which the exterior film 10 is used as the exterior member for accommodating the battery element 20. The secondary battery has a flat three-dimensional shape.
［外装フィルム］
　外装フィルム１０は、可撓性（または柔軟性）を有する外装部材であり、より具体的には、図１、図４および図５に示すように、中空の袋状の部材である。外装フィルム１０は、高分子材料および金属材料などのうちのいずれか１種類または２種類以上を含んでいる。 [Exterior film]
The exterior film 10 is a flexible (or flexible) exterior member, and more specifically, as shown in FIGS. 1, 4 and 5, a hollow bag-shaped member. The exterior film 10 contains any one or more of a polymer material, a metal material, and the like.
　具体的には、外装フィルム１０は、内側から融着層、金属層および表面保護層が順に積層された３層のラミネートフィルムである。融着層は、ポリプロピレンなどの高分子材料を含んでいる高分子フィルムであり、熱融着法などを用いて融着可能である。金属層は、アルミニウムなどの金属材料を含んでいる金属箔である。表面保護層は、ナイロンなどの高分子材料を含んでいる高分子フィルムである。ただし、ラミネートフィルムである外装フィルム１０の層数は、特に限定されず、２層または４層以上でもよい。また、外装フィルム１０は、多層に限られずに単層でもよい。 Specifically, the exterior film 10 is a three-layer laminated film in which a fusion layer, a metal layer, and a surface protective layer are laminated in this order from the inside. The fusion layer is a polymer film containing a polymer material such as polypropylene, and can be fused by using a heat fusion method or the like. The metal layer is a metal leaf containing a metal material such as aluminum. The surface protective layer is a polymer film containing a polymer material such as nylon. However, the number of layers of the exterior film 10 which is a laminated film is not particularly limited, and may be two layers or four or more layers. Further, the exterior film 10 is not limited to multiple layers and may be a single layer.
　外装フィルム１０は、正極配線２００を突出させるための開口部１０Ｋ１を有し、かつ負極配線３００を突出させるための開口部１０Ｋ２を有している。開口部１０Ｋ１は、正極配線２００が開口部１０Ｋ１を経由して外装フィルム１０の外部に延出された状態にて、正極シーラント７０により封止されている。また、開口部１０Ｋ２は、負極配線３００が開口部１０Ｋ２を経由して外装フィルム１０の外部に延出された状態にて、負極シーラント８０により封止されている。 The exterior film 10 has an opening 10K1 for projecting the positive electrode wiring 200 and an opening 10K2 for projecting the negative electrode wiring 300. The opening 10K1 is sealed with the positive electrode sealant 70 in a state where the positive electrode wiring 200 extends to the outside of the exterior film 10 via the opening 10K1. Further, the opening 10K2 is sealed with the negative electrode sealant 80 in a state where the negative electrode wiring 300 extends to the outside of the exterior film 10 via the opening 10K2.
［電池素子］
　電池素子２０は、充放電反応を進行させる素子であり、図１～図５に示すように、外装フィルム１０の内部に収納されている。電池素子２０は、正極２１と、負極２２と、セパレータ２３と、液状の電解質である電解液とを含んでいる。ただし、図１～図５では、電解液の図示を省略している。 [Battery element]
The battery element 20 is an element that advances the charge / discharge reaction, and is housed inside the exterior film 10 as shown in FIGS. 1 to 5. The battery element 20 includes a positive electrode 21, a negative electrode 22, a separator 23, and an electrolytic solution which is a liquid electrolyte. However, in FIGS. 1 to 5, the illustration of the electrolytic solution is omitted.
　正極２１および負極２２は、セパレータ２３を介して巻回されている。具体的には、正極２１および負極２２は、セパレータ２３を介して互いに積層されており、セパレータ２３を介して互いに積層された状態にて巻回されている。したがって、電池素子２０は、セパレータ２３を介して巻回された正極２１および負極２２を含む巻回電極体である。なお、正極２１、負極２２およびセパレータ２３のそれぞれの巻回数は、特に限定されず、任意に設定可能である。 The positive electrode 21 and the negative electrode 22 are wound around the separator 23. Specifically, the positive electrode 21 and the negative electrode 22 are laminated with each other via the separator 23, and are wound in a state of being laminated with each other via the separator 23. Therefore, the battery element 20 is a wound electrode body including a positive electrode 21 and a negative electrode 22 wound via a separator 23. The number of turns of each of the positive electrode 21, the negative electrode 22, and the separator 23 is not particularly limited and can be set arbitrarily.
　ただし、正極２１の高さは、セパレータ２３の高さより小さくなっている。これは、正極２１に起因する短絡を防止するためである。また、負極２２の高さは、セパレータ２３の高さよりも小さく、かつ正極２１の高さよりも大きくなっている。これは、負極２２に起因する短絡を防止すると共に、充放電時におけるリチウムの析出に起因する正極２１と負極２２との短絡を防止するためである。 However, the height of the positive electrode 21 is smaller than the height of the separator 23. This is to prevent a short circuit caused by the positive electrode 21. Further, the height of the negative electrode 22 is smaller than the height of the separator 23 and larger than the height of the positive electrode 21. This is to prevent a short circuit caused by the negative electrode 22 and to prevent a short circuit between the positive electrode 21 and the negative electrode 22 due to the precipitation of lithium during charging and discharging.
　正極２１は、電池素子２０を構成する一方の電極である。正極２１は、正極集電体２１Ａおよび正極活物質層２１Ｂを含んでいる。正極集電体２１Ａは、アルミニウムなどの金属材料を含んでいる金属箔である。正極活物質層２１Ｂは、正極集電体２１Ａの両面に設けられている。ただし、正極活物質層２１Ｂは、正極集電体２１Ａの片面だけに設けられていてもよい。 The positive electrode 21 is one of the electrodes constituting the battery element 20. The positive electrode 21 includes a positive electrode current collector 21A and a positive electrode active material layer 21B. The positive electrode current collector 21A is a metal foil containing a metal material such as aluminum. The positive electrode active material layer 21B is provided on both sides of the positive electrode current collector 21A. However, the positive electrode active material layer 21B may be provided on only one side of the positive electrode current collector 21A.
　正極活物質層２１Ｂは、リチウムを吸蔵放出する正極活物質を含んでおり、正極活物質は、リチウム含有遷移金属化合物などのリチウム含有化合物のうちのいずれか１種類または２種類以上を含んでいる。リチウム含有遷移金属化合物は、リチウムと共に１種類または２種類以上の遷移金属元素を構成元素として含む酸化物、リン酸化合物、ケイ酸化合物およびホウ酸化合物などである。正極活物質層２１Ｂは、さらに正極結着剤および正極導電剤などを含んでいてもよい。 The positive electrode active material layer 21B contains a positive electrode active material that occludes and releases lithium, and the positive electrode active material contains any one or more of lithium-containing compounds such as a lithium-containing transition metal compound. .. The lithium-containing transition metal compound is an oxide, a phosphoric acid compound, a silicic acid compound, a boric acid compound or the like containing one or more kinds of transition metal elements as constituent elements together with lithium. The positive electrode active material layer 21B may further contain a positive electrode binder, a positive electrode conductive agent, and the like.
　負極２２は、電池素子２０を構成する他方の電極である。負極２２は、負極集電体２２Ａおよび負極活物質層２２Ｂを含んでいる。負極集電体２２Ａは、銅などの金属材料を含んでいる金属箔である。負極活物質層２２Ｂは、負極集電体２２Ａの両面に設けられている。ただし、負極活物質層２２Ｂは、負極集電体２２Ａの片面だけに設けられていてもよい。 The negative electrode 22 is the other electrode constituting the battery element 20. The negative electrode 22 includes a negative electrode current collector 22A and a negative electrode active material layer 22B. The negative electrode current collector 22A is a metal foil containing a metal material such as copper. The negative electrode active material layer 22B is provided on both sides of the negative electrode current collector 22A. However, the negative electrode active material layer 22B may be provided on only one side of the negative electrode current collector 22A.
　負極活物質層２２Ｂは、リチウムを吸蔵放出する負極活物質を含んでおり、負極活物質は、炭素材料および金属系材料などのうちのいずれか１種類または２種類以上を含んでいる。炭素材料は、黒鉛などである。金属系材料は、リチウムと合金を形成可能である金属元素および半金属元素のうちのいずれか１種類または２種類以上を構成元素として含む材料であり、具体的にはケイ素およびスズなどを含んでいる。金属系材料は、単体でもよく、合金でもよく、化合物でもよく、それらの２種類以上の混合物でもよい。負極活物質層２２Ｂは、さらに負極結着剤および負極導電剤などを含んでいてもよい。 The negative electrode active material layer 22B contains a negative electrode active material that occludes and releases lithium, and the negative electrode active material contains any one or more of carbon materials and metal-based materials. The carbon material is graphite or the like. The metal-based material is a material containing one or more of metal elements and metalloid elements capable of forming an alloy with lithium as constituent elements, and specifically contains silicon, tin, and the like. There is. The metal-based material may be a simple substance, an alloy, a compound, or a mixture of two or more of them. The negative electrode active material layer 22B may further contain a negative electrode binder, a negative electrode conductive agent, and the like.
　セパレータ２３は、正極２１と負極２２との間に介在する絶縁性の多孔質膜である。セパレータ２３は、正極２１と負極２２との短絡を防止しながらリチウムを通過させることができる。セパレータ２３は、ポリエチレンなどの高分子材料のうちのいずれか１種類または２種類以上を含んでいる。 The separator 23 is an insulating porous film interposed between the positive electrode 21 and the negative electrode 22. The separator 23 can allow lithium to pass through while preventing a short circuit between the positive electrode 21 and the negative electrode 22. The separator 23 contains any one or more of the polymer materials such as polyethylene.
　電解液は、正極２１、負極２２およびセパレータ２３の各々に含浸されており、溶媒および電解質塩を含んでいる。溶媒は、炭酸エステル系化合物、カルボン酸エステル系化合物およびラクトン系化合物などの非水溶媒（有機溶剤）のうちのいずれか１種類または２種類以上を含んでいる。電解質塩は、リチウム塩などの軽金属塩のうちのいずれか１種類または２種類以上を含んでいる。 The electrolytic solution is impregnated in each of the positive electrode 21, the negative electrode 22, and the separator 23, and contains a solvent and an electrolyte salt. The solvent contains any one or more of non-aqueous solvents (organic solvents) such as carbonic acid ester compounds, carboxylic acid ester compounds and lactone compounds. The electrolyte salt contains any one or more of light metal salts such as lithium salt.
　図３に示すように、巻回電極体である電池素子２０では、正極活物質層２１Ｂが正極集電体２１Ａの一部に設けられていると共に、負極活物質層２２Ｂが負極集電体２２Ａの一部に設けられている。 As shown in FIG. 3, in the battery element 20 which is a wound electrode body, the positive electrode active material layer 21B is provided as a part of the positive electrode current collector 21A, and the negative electrode active material layer 22B is the negative electrode current collector 22A. It is provided in a part of.
　具体的には、正極２１の巻内側および巻外側のそれぞれの端部では、正極集電体２１Ａに正極活物質層２１Ｂが設けられていないため、正極集電体２１Ａは、両端部に露出部２１ＡＨを有している。これにより、正極２１は、巻内側および巻外側のそれぞれの端部にて正極集電体２１Ａだけが巻回されている箔巻構造を有している。 Specifically, since the positive electrode current collector 21A is not provided with the positive electrode active material layer 21B at the inner and outer ends of the positive electrode 21, the positive electrode current collector 21A has exposed portions at both ends. It has 21 AH. As a result, the positive electrode 21 has a foil winding structure in which only the positive electrode current collector 21A is wound around the inner and outer ends of the winding.
　同様に、負極２２の巻内側および巻外側のそれぞれの端部では、負極集電体２２Ａに負極活物質層２２Ｂが設けられていないため、負極集電体２２Ａは、両端部に露出部２２ＡＨを有している。これにより、負極２２は、巻内側および巻外側のそれぞれの端部において負極集電体２２Ａだけが巻回されている箔巻構造を有している。 Similarly, since the negative electrode current collector 22A is not provided with the negative electrode active material layer 22B at the inner and outer ends of the negative electrode 22, the negative electrode current collector 22A has exposed portions 22AH at both ends. Have. As a result, the negative electrode 22 has a foil winding structure in which only the negative electrode current collector 22A is wound around the inner and outer ends of the winding.
［正極配線および負極配線］
　正極配線２００は、外装フィルム１０の内部から開口部１０Ｋ１を経由して外装フィルム１０の外部まで延在しており、電池素子２０のうちの正極２１に接続されている。負極配線３００は、外装フィルム１０の内部から開口部１０Ｋ２を経由して外装フィルム１０の外部まで延在しており、電池素子２０のうちの負極２２に接続されている。 [Positive and negative electrode wiring]
The positive electrode wiring 200 extends from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K1 and is connected to the positive electrode 21 of the battery element 20. The negative electrode wiring 300 extends from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K2, and is connected to the negative electrode 22 of the battery element 20.
［正極リード］
　図１および図４に示すように、正極リード３０は、外装フィルム１０の内部から開口部１０Ｋ１を経由して外装フィルム１０の外部まで延在する第１配線部材である。 [Positive lead]
As shown in FIGS. 1 and 4, the positive electrode lead 30 is a first wiring member extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K1.
　正極リード３０の一端部は、外装フィルム１０の内部において複数の正極タブ５０のそれぞれの他端部に接続されている。一方、正極リード３０の他端部は、外装フィルム１０の外部に延出されている。 One end of the positive electrode lead 30 is connected to the other end of each of the plurality of positive electrode tabs 50 inside the exterior film 10. On the other hand, the other end of the positive electrode lead 30 extends to the outside of the exterior film 10.
　ここで、正極リード３０の一端部は、後述する正極タブ５０の接合部Ｊ１と少なくとも１つのかしめ構造５３にて接続されている。ここで、かしめ構造５３とは、後述するが、正極リード３０および複数の正極タブ５０の双方を貫通する貫通孔を通って、正極リード３０および正極タブ５０の一部を折り返して圧着させた構造を表す。かしめ構造５３の貫通孔の内部には、導電部材等が存在してもよいが、かしめ構造５３のコンパクト化という観点からは導電部材等が存在しないことが好ましい。二次電池は、正極リード３０および複数の正極タブ５０をかしめ構造５３にて接続することで、正極リード３０および複数の正極タブ５０の接続強度をより高めることができるため、外部負荷に起因する内部配線の破断をより抑制することができる。 Here, one end of the positive electrode lead 30 is connected to the joint portion J1 of the positive electrode tab 50, which will be described later, by at least one caulking structure 53. Here, the caulking structure 53 is a structure in which a part of the positive electrode lead 30 and the positive electrode tab 50 is folded back and crimped through through holes penetrating both the positive electrode lead 30 and the plurality of positive electrode tabs 50, which will be described later. Represents. A conductive member or the like may be present inside the through hole of the caulking structure 53, but it is preferable that no conductive member or the like is present from the viewpoint of making the caulking structure 53 compact. In the secondary battery, the positive electrode lead 30 and the plurality of positive electrode tabs 50 are connected by the caulking structure 53, so that the connection strength of the positive electrode lead 30 and the plurality of positive electrode tabs 50 can be further increased, which is caused by an external load. Breakage of internal wiring can be further suppressed.
　正極リード３０は、外装フィルム１０の内部において、扁平形状の電池素子２０の厚み方向に屈曲している。正極リード３０は、リード部３０Ａ，３０Ｂを含んでいる。 The positive electrode lead 30 is bent in the thickness direction of the flat battery element 20 inside the exterior film 10. The positive electrode lead 30 includes lead portions 30A and 30B.
　リード部３０Ａは、外装フィルム１０の内部から開口部１０Ｋ１を経由して外装フィルム１０の外部まで延在する部分である。リード部３０Ｂは、外装フィルム１０の内部において電池素子２０に対向しながらリード部３０Ａの延在方向と交差する電池素子２０の厚み方向に延在する対向部である。 The lead portion 30A is a portion extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K1. The lead portion 30B is an opposing portion that extends in the thickness direction of the battery element 20 that intersects the extending direction of the lead portion 30A while facing the battery element 20 inside the exterior film 10.
　リード部３０Ｂは、下面Ｍ１、上面Ｍ２および側面Ｍ３を有している。下面Ｍ１は、リード部３０Ｂが電池素子２０に対向する面（対向面）である。上面Ｍ２は、下面Ｍ１の反対側の面（反対面）である。側面Ｍ３は、下面Ｍ１と上面Ｍ２との間に位置すると共に、下面Ｍ１および上面Ｍ２の各々に連結された面である。 The lead portion 30B has a lower surface M1, an upper surface M2, and a side surface M3. The lower surface M1 is a surface (opposing surface) on which the lead portion 30B faces the battery element 20. The upper surface M2 is a surface (opposite surface) on the opposite side of the lower surface M1. The side surface M3 is a surface located between the lower surface M1 and the upper surface M2 and connected to each of the lower surface M1 and the upper surface M2.
　なお、リード部３０Ｂが電池素子２０に対向していれば、リード部３０Ｂの下面Ｍ１は電池素子２０の上面２０Ｍに対して平行となっていてもよく、上面２０Ｍに対して傾斜していてもよい。下面Ｍ１の上面２０Ｍに対する傾斜角度は、リード部３０Ｂと電池素子２０との対向関係が担保される角度であれば、特に限定されない。 If the lead portion 30B faces the battery element 20, the lower surface M1 of the lead portion 30B may be parallel to the upper surface 20M of the battery element 20, or may be inclined with respect to the upper surface 20M. good. The inclination angle of the lower surface M1 with respect to the upper surface 20M is not particularly limited as long as the facing relationship between the lead portion 30B and the battery element 20 is guaranteed.
　正極リード３０は、正極集電体２１Ａと同様にアルミニウムなどの金属材料を含んでいる。ただし、正極リード３０は、正極集電体２１Ａと同じ金属材料を含んでいてもよく、正極集電体２１Ａと異なる金属材料を含んでいてもよい。 The positive electrode lead 30 contains a metal material such as aluminum as in the positive electrode current collector 21A. However, the positive electrode lead 30 may contain the same metal material as the positive electrode current collector 21A, or may contain a metal material different from that of the positive electrode current collector 21A.
［負極リード］
　負極リード４０は、上記した正極リード３０の構成と同様の構成を有している。すなわち、図１および図５に示すように、負極リード４０は、外装フィルム１０の内部から開口部１０Ｋ２を経由して外装フィルム１０の外部まで延在する第１配線部材である。 [Negative electrode lead]
The negative electrode lead 40 has the same configuration as that of the positive electrode lead 30 described above. That is, as shown in FIGS. 1 and 5, the negative electrode lead 40 is a first wiring member extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K2.
　負極リード４０の一端部は、外装フィルム１０の内部において複数の負極タブ６０のそれぞれの他端部に接続されている。一方、負極リード４０の他端部は、外装フィルム１０の外部に延出されている。 One end of the negative electrode lead 40 is connected to the other end of each of the plurality of negative electrode tabs 60 inside the exterior film 10. On the other hand, the other end of the negative electrode lead 40 extends to the outside of the exterior film 10.
　ここで、負極リード４０の一端部は、後述する負極タブ６０の接合部Ｊ２と少なくとも１つのかしめ構造６３にて接続されている。二次電池は、負極リード４０および複数の負極タブ６０をかしめ構造６３にて接続することで、負極リード４０および複数の負極タブ６０の接続強度をより高めることができるため、外部負荷に起因する内部配線の破断をより抑制することができる。 Here, one end of the negative electrode lead 40 is connected to the joint J2 of the negative electrode tab 60, which will be described later, by at least one caulking structure 63. In the secondary battery, the negative electrode lead 40 and the plurality of negative electrode tabs 60 are connected by the caulking structure 63, so that the connection strength of the negative electrode lead 40 and the plurality of negative electrode tabs 60 can be further increased, which is caused by an external load. Breakage of internal wiring can be further suppressed.
　負極リード４０は、外装フィルム１０の内部において、扁平形状の電池素子２０の厚み方向に屈曲している。負極リード４０は、リード部４０Ａ，４０Ｂを含んでいる。 The negative electrode lead 40 is bent in the thickness direction of the flat battery element 20 inside the exterior film 10. The negative electrode lead 40 includes lead portions 40A and 40B.
　リード部４０Ａは、外装フィルム１０の内部から開口部１０Ｋ２を経由して外装フィルム１０の外部まで延在する部分である。リード部４０Ｂは、外装フィルム１０の内部において電池素子２０に対向しながらリード部４０Ａの延在方向と交差する電池素子２０の厚み方向に延在する対向部である。 The lead portion 40A is a portion extending from the inside of the exterior film 10 to the outside of the exterior film 10 via the opening 10K2. The lead portion 40B is an opposing portion that extends in the thickness direction of the battery element 20 that intersects the extending direction of the lead portion 40A while facing the battery element 20 inside the exterior film 10.
　リード部４０Ｂは、下面Ｎ１、上面Ｎ２および側面Ｎ３を有している。下面Ｎ１は、リード部４０Ｂが電池素子２０に対向する面（対向面）である。上面Ｎ２は、下面Ｎ１の反対側の面（反対面）である。側面Ｎ３は、下面Ｎ１と上面Ｎ２との間に位置すると共に、下面Ｎ１および上面Ｎ２の各々に連結された面である。 The lead portion 40B has a lower surface N1, an upper surface N2, and a side surface N3. The lower surface N1 is a surface (opposing surface) on which the lead portion 40B faces the battery element 20. The upper surface N2 is a surface (opposite surface) on the opposite side of the lower surface N1. The side surface N3 is a surface located between the lower surface N1 and the upper surface N2 and connected to each of the lower surface N1 and the upper surface N2.
　なお、リード部４０Ｂが電池素子２０に対向していれば、リード部４０Ｂの下面Ｎ１は電池素子２０の上面２０Ｍに対して平行となっていてもよく、上面２０Ｍに対して傾斜していてもよい。下面Ｎ１の上面２０Ｍに対する傾斜角度は、リード部４０Ｂと電池素子２０との対向関係が担保される角度であれば、特に限定されない。 If the lead portion 40B faces the battery element 20, the lower surface N1 of the lead portion 40B may be parallel to the upper surface 20M of the battery element 20, or may be inclined with respect to the upper surface 20M. good. The inclination angle of the lower surface N1 with respect to the upper surface 20M is not particularly limited as long as the facing relationship between the lead portion 40B and the battery element 20 is guaranteed.
　負極リード４０は、負極集電体２２Ａと同様に銅などの金属材料を含んでいる。ただし、負極リード４０は、負極集電体２２Ａと同じ金属材料を含んでいてもよく、負極集電体２２Ａと異なる金属材料を含んでいてもよい。 The negative electrode lead 40 contains a metal material such as copper as in the negative electrode current collector 22A. However, the negative electrode lead 40 may contain the same metal material as the negative electrode current collector 22A, or may contain a metal material different from that of the negative electrode current collector 22A.
［複数の正極タブ］
　図４に示すように、複数の正極タブ５０は、外装フィルム１０の内部に配置されている複数の第２配線部材である。正極タブ５０は、複数設けられることで、電池素子２０（正極２１）の電気抵抗（集電抵抗）をより低下させることができる。 [Multiple positive tabs]
As shown in FIG. 4, the plurality of positive electrode tabs 50 are a plurality of second wiring members arranged inside the exterior film 10. By providing a plurality of positive electrode tabs 50, the electric resistance (current collecting resistance) of the battery element 20 (positive electrode 21) can be further reduced.
　図４では、２本の正極タブ５０（５１，５２）が設けられている例を示す。このような場合、正極タブ５０（５１，５２）は、正極タブ５０の数が１本である場合と比較して、上記したように、電池素子２０の電気抵抗を低下させることができる。一方、正極リード３０の数を複数にした場合、複数の正極リード３０の各々を個別に外装フィルム１０から外部に延出させる、または複数の正極リード３０を互いに重ねた状態で外装フィルム１０から外部に延出させることになる。このような場合、正極リード３０と外装フィルム１０との封止構造が複雑化または大型化し、封止構造の信頼性が低下しやすくなるため好ましくない。 FIG. 4 shows an example in which two positive electrode tabs 50 (51, 52) are provided. In such a case, the positive electrode tabs 50 (51, 52) can reduce the electric resistance of the battery element 20 as described above, as compared with the case where the number of positive electrode tabs 50 is one. On the other hand, when the number of positive electrode leads 30 is a plurality, each of the plurality of positive electrode leads 30 is individually extended from the exterior film 10 to the outside, or the plurality of positive electrode leads 30 are overlapped with each other and externally from the exterior film 10. Will be extended to. In such a case, the sealing structure between the positive electrode lead 30 and the exterior film 10 becomes complicated or large in size, and the reliability of the sealing structure tends to decrease, which is not preferable.
　正極タブ５０の数は、特に限定されず、任意に設定可能であるが、電池素子２０の電気抵抗を低下させると共に、外装フィルム１０の内部空間における体積損失を抑制するためには、３本以下であることが好ましく、２本以下であることがより好ましい。 The number of positive electrode tabs 50 is not particularly limited and can be set arbitrarily. However, in order to reduce the electrical resistance of the battery element 20 and suppress the volume loss in the internal space of the exterior film 10, the number of positive electrode tabs 50 is 3 or less. It is preferable that the number is two or less, and more preferably two or less.
　正極タブ５１，５２のそれぞれの一端部は、電池素子２０に接続されており、具体的には正極２１（正極集電体２１Ａ）に接続されている。一方、正極タブ５１，５２のそれぞれの他端部は、互いに接触している。 One end of each of the positive electrode tabs 51 and 52 is connected to the battery element 20, specifically, is connected to the positive electrode 21 (positive electrode current collector 21A). On the other hand, the other ends of the positive electrode tabs 51 and 52 are in contact with each other.
　正極タブ５１，５２は、かしめ構造５３によって正極リード３０のリード部３０Ｂとまとめて接合されている。具体的には、図６に示すように、かしめ構造５３は、正極リード３０および複数の正極タブ５１，５２の双方を貫通する貫通孔５３Ａを通って、正極リード３０および複数の正極タブ５１，５２を互いにかしめた構造を含む。これによれば、かしめ構造５３は、正極リード３０および複数の正極タブ５１，５２をまとめて接続することができるため、二次電池の構造および製造工程をより単純化することができる。 The positive electrode tabs 51 and 52 are collectively joined to the lead portion 30B of the positive electrode lead 30 by the caulking structure 53. Specifically, as shown in FIG. 6, the caulking structure 53 passes through the through holes 53A penetrating both the positive electrode lead 30 and the plurality of positive electrode tabs 51 and 52, and the positive electrode lead 30 and the plurality of positive electrode tabs 51, Includes a structure in which 52s are crimped to each other. According to this, since the caulking structure 53 can connect the positive electrode lead 30 and the plurality of positive electrode tabs 51 and 52 together, the structure and manufacturing process of the secondary battery can be further simplified.
　正極リード３０および複数の正極タブ５１，５２は、厚みが互いに異なるように設けられてもよい。これは、かしめ構造５３は、互いに厚みが異なる部材同士であっても安定して接続することが可能なためである。一方、抵抗溶接などの溶接法は、互いに厚みが異なる部材同士を接合する場合、溶接が強すぎると厚みがより薄い部材を破損させてしまう一方で、溶接が過度に弱すぎると接合が不十分となるため、溶接条件の設定が極めて複雑となる。したがって、かしめ構造５３は、互いに厚みが異なる正極リード３０および複数の正極タブ５１，５２を接続する際により好適に用いることができる。 The positive electrode leads 30 and the plurality of positive electrode tabs 51 and 52 may be provided so as to have different thicknesses. This is because the caulking structure 53 can stably connect members having different thicknesses to each other. On the other hand, in welding methods such as resistance welding, when joining members with different thicknesses, if the welding is too strong, the thinner members will be damaged, but if the welding is too weak, the joining will be insufficient. Therefore, the setting of welding conditions becomes extremely complicated. Therefore, the caulking structure 53 can be more preferably used when connecting the positive electrode leads 30 having different thicknesses and the plurality of positive electrode tabs 51 and 52.
　正極タブ５１，５２の厚さは、正極リード３０の厚さよりも薄く設けられていることが好ましい。これによれば、正極リード３０および複数の正極タブ５１，５２は、外装フィルム１０の内部空間における体積損失をより抑制することができる。また、このような場合、図６に示すように、より厚みの大きい正極リード３０にてより厚みの小さい正極タブ５１，５２をかしめて固定することができるため、正極リード３０および複数の正極タブ５１，５２の接続強度をより高めることができる。 It is preferable that the thicknesses of the positive electrode tabs 51 and 52 are thinner than the thickness of the positive electrode leads 30. According to this, the positive electrode leads 30 and the plurality of positive electrode tabs 51 and 52 can further suppress the volume loss in the internal space of the exterior film 10. Further, in such a case, as shown in FIG. 6, since the smaller positive electrode tabs 51 and 52 can be crimped and fixed by the thicker positive electrode lead 30, the positive electrode lead 30 and the plurality of positive electrode tabs can be fixed. The connection strength of 51 and 52 can be further increased.
　かしめ構造５３は、電池素子２０に対向する面側から反対の面側に向かって正極リード３０および複数の正極タブ５１，５２を互いにかしめた構造であってもよい。すなわち、かしめ構造５３は、正極リード３０が下面Ｍ１から上面Ｍ２に向かって複数の正極タブ５１，５２をかしめ、外装フィルム１０に対向する面側に突出する構造であってもよい。このような場合、かしめ構造５３は、バリが発生する面を電池素子２０と対向する面と反対の面とすることができるため、バリによる電池素子２０の短絡の可能性を抑制することができる。 The caulking structure 53 may have a structure in which the positive electrode lead 30 and the plurality of positive electrode tabs 51 and 52 are crimped to each other from the surface side facing the battery element 20 to the opposite surface side. That is, the caulking structure 53 may have a structure in which the positive electrode leads 30 crimp a plurality of positive electrode tabs 51 and 52 from the lower surface M1 toward the upper surface M2 and project toward the surface facing the exterior film 10. In such a case, in the caulking structure 53, the surface where burrs are generated can be the surface opposite to the surface facing the battery element 20, so that the possibility of a short circuit of the battery element 20 due to burrs can be suppressed. ..
　正極タブ５１，５２は、互いに接合されることにより、接合部Ｊ１を形成している。接合部Ｊ１は、正極タブ５１，５２のそれぞれの他端部同士が接合されている部分である。接合部Ｊ１は、上記したように、かしめ構造５３にて正極リード３０の一端部と接続されている。正極リード３０が外装フィルム１０の内部においてリード部３０Ｂを含んでいるため、接合部Ｊ１は、上面Ｍ２においてリード部３０Ｂに接続されている。 The positive electrode tabs 51 and 52 are joined to each other to form a joint portion J1. The joint portion J1 is a portion where the other ends of the positive electrode tabs 51 and 52 are joined to each other. As described above, the joint portion J1 is connected to one end of the positive electrode lead 30 by the caulking structure 53. Since the positive electrode lead 30 includes the lead portion 30B inside the exterior film 10, the joint portion J1 is connected to the lead portion 30B on the upper surface M2.
　正極タブ５１，５２のうちの一部（正極タブ５１）は、リード部３０Ｂの表面に沿うように屈曲している。具体的には、正極タブ５１は、下面Ｍ１、側面Ｍ３および上面Ｍ２に順に沿うように屈曲している。これにより、接合部Ｊ１は、上面Ｍ２においてリード部３０Ｂに接続されている。 A part of the positive electrode tabs 51 and 52 (positive electrode tab 51) is bent along the surface of the lead portion 30B. Specifically, the positive electrode tab 51 is bent along the lower surface M1, the side surface M3, and the upper surface M2 in this order. As a result, the joint portion J1 is connected to the lead portion 30B on the upper surface M2.
　より詳細には、正極タブ５１，５２は、電池素子２０と接続された側から正極リード３０のリード部３０Ｂが延在する第１方向に延在する第１延在部Ｅ１と、第１方向と反対の第２方向に延在する第２延在部Ｅ２とを含んでいる。正極タブ５１，５２は、第１延在部Ｅ１を下面Ｍ１に沿わせると共に、第２延在部Ｅ２を上面Ｍ２に沿わせることで、第１延在部Ｅ１および第２延在部Ｅ２の間の変形をより緩やかにすることができるため、破断の可能性を抑制することができる。 More specifically, the positive electrode tabs 51 and 52 have a first extending portion E1 extending in the first direction in which the lead portion 30B of the positive electrode lead 30 extends from the side connected to the battery element 20, and a first direction. The second extending portion E2 extending in the second direction opposite to the above is included. The positive electrode tabs 51 and 52 have the first extending portion E1 along the lower surface M1 and the second extending portion E2 along the upper surface M2, so that the first extending portion E1 and the second extending portion E2 can be formed. Since the deformation between them can be made more gentle, the possibility of breakage can be suppressed.
　正極タブ５１，５２の各々は、正極集電体２１Ａと同様にアルミニウムなどの金属材料を含んでいる。ただし、正極タブ５１，５２の各々は、正極集電体２１Ａと同じ金属材料を含んでいてもよく、正極集電体２１Ａと異なる金属材料を含んでいてもよい。 Each of the positive electrode tabs 51 and 52 contains a metal material such as aluminum as in the positive electrode current collector 21A. However, each of the positive electrode tabs 51 and 52 may contain the same metal material as the positive electrode current collector 21A, or may contain a metal material different from that of the positive electrode current collector 21A.
　正極タブ５１，５２は、正極リード３０と互いに異なる金属材料を含んでいてもよい。かしめ構造５３は、物理的な形状にて部材同士を接続するため、接続される部材の形成材料が互いに異なる場合であっても接続強度を維持することが可能である。したがって、正極リード３０および正極タブ５１，５２は、電気的な特性を優先して形成材料を選択することができる。 The positive electrode tabs 51 and 52 may contain metal materials different from those of the positive electrode leads 30. Since the caulking structure 53 connects the members to each other in a physical shape, it is possible to maintain the connection strength even when the forming materials of the members to be connected are different from each other. Therefore, for the positive electrode leads 30 and the positive electrode tabs 51 and 52, the forming material can be selected with priority given to the electrical characteristics.
　正極タブ５１，５２の各々と正極２１との接続位置は、特に限定されない。ただし、正極タブ５１は、箔巻構造を有する正極２１の巻内側の端部（露出部２１ＡＨ）に接続され、かつ正極タブ５２は、箔巻構造を有する正極２１の巻外側の端部（露出部２１ＡＨ）に接続されてもよい。このような場合、正極タブ５１，５２の各々は、図３に示す正極集電体２１Ａの延在方向の中心に対して左右対称な位置にて、正極集電体２１Ａ（露出部２１ＡＨ）に接続されることになる。これによれば、正極タブ５１，５２の各々は、正極集電体２１Ａの延在方向の中心位置から接続位置までの距離が互いにほぼ等しくなるため、正極集電体２１Ａによる集電性をより均一化することができる。したがって、二次電池は、正極２１における充放電反応をより均一に進行させやすくすることができる。 The connection position between each of the positive electrode tabs 51 and 52 and the positive electrode 21 is not particularly limited. However, the positive electrode tab 51 is connected to the inner end (exposed portion 21AH) of the positive electrode 21 having the foil winding structure, and the positive electrode tab 52 is the outer end (exposed) of the positive electrode 21 having the foil winding structure. It may be connected to the unit 21AH). In such a case, each of the positive electrode tabs 51 and 52 is attached to the positive electrode current collector 21A (exposed portion 21AH) at a position symmetrical with respect to the center of the positive electrode current collector 21A shown in FIG. 3 in the extending direction. It will be connected. According to this, each of the positive electrode tabs 51 and 52 has substantially the same distance from the center position in the extending direction of the positive electrode current collector 21A to the connection position, so that the current collecting property of the positive electrode current collector 21A is improved. Can be homogenized. Therefore, the secondary battery can facilitate the charge / discharge reaction at the positive electrode 21 to proceed more uniformly.
　なお、図４では、正極タブ５２は、図に正対して右側にて正極集電体２１Ａ（露出部２１ＡＨ）に接続されているが、正極集電体２１Ａに対する正極タブ５２の接続位置は、特に限定されない。一例を挙げると、正極タブ５２は、図に正対して左側にて正極集電体２１Ａに接続されていてもよい。ただし、正極タブ５２の長さをより短くするためには、正極タブ５２は、図４に正対して右側、すなわち正極リード３０の一端部の先端に近い側にて正極集電体２１Ａに接続されていることが好ましい。 In FIG. 4, the positive electrode tab 52 is connected to the positive electrode current collector 21A (exposed portion 21AH) on the right side facing the figure, but the connection position of the positive electrode tab 52 with respect to the positive electrode current collector 21A is. There is no particular limitation. As an example, the positive electrode tab 52 may be connected to the positive electrode current collector 21A on the left side facing the figure. However, in order to shorten the length of the positive electrode tab 52, the positive electrode tab 52 is connected to the positive electrode current collector 21A on the right side facing FIG. 4, that is, on the side closer to the tip of one end of the positive electrode lead 30. It is preferable that the electrode is used.
［複数の負極タブ］
　図５に示すように、複数の負極タブ６０は、上記した複数の正極タブ５０の構成と同様の構成を有している。すなわち、複数の負極タブ６０は、外装フィルム１０の内部に配置されている複数の第２配線部材である。負極タブ６０は、複数設けられることで、電池素子２０（負極２２）の電気抵抗（集電抵抗）を低下させることができる。 [Multiple negative electrode tabs]
As shown in FIG. 5, the plurality of negative electrode tabs 60 have the same configuration as the configuration of the plurality of positive electrode tabs 50 described above. That is, the plurality of negative electrode tabs 60 are a plurality of second wiring members arranged inside the exterior film 10. By providing a plurality of negative electrode tabs 60, the electrical resistance (current collection resistance) of the battery element 20 (negative electrode 22) can be reduced.
　図５では、２本の負極タブ６０（６１，６２）が設けられている例を示す。これは、２本の正極タブ５０（５１，５２）について説明した場合と同様の理由により、電池素子２０の電気抵抗を低下させるためには、負極リード４０の数を複数とするよりも負極タブ６０の数を複数とするほうが好ましいためである。 FIG. 5 shows an example in which two negative electrode tabs 60 (61, 62) are provided. This is because, for the same reason as described for the two positive electrode tabs 50 (51, 52), in order to reduce the electrical resistance of the battery element 20, the negative electrode tabs are more than a plurality of negative electrode leads 40. This is because it is preferable that the number of 60 is a plurality.
　負極タブ６０の数は、特に限定されず、任意に設定可能であるが、正極タブ５０の数について説明した場合と同様の理由により、３本以下であることが好ましく、２本以下であることがより好ましい。 The number of the negative electrode tabs 60 is not particularly limited and can be set arbitrarily, but for the same reason as described in the case where the number of the positive electrode tabs 50 is described, the number is preferably 3 or less, and is preferably 2 or less. Is more preferable.
　負極タブ６１，６２のそれぞれの一端部は、電池素子２０に接続されており、具体的には負極２２（負極集電体２２Ａ）に接続されている。一方、負極タブ６１，６２のそれぞれの他端部は、互いに接触している。 One end of each of the negative electrode tabs 61 and 62 is connected to the battery element 20, specifically, is connected to the negative electrode 22 (negative electrode current collector 22A). On the other hand, the other ends of the negative electrode tabs 61 and 62 are in contact with each other.
　負極タブ６１，６２は、互いに接合されることにより、接合部Ｊ２を形成している。接合部Ｊ２は、負極タブ６１，６２のそれぞれの他端部同士が接合されている部分であり、正極タブ５１，５２と同様に、かしめ構造６３にて負極リード４０の一端部と接続されている。かしめ構造６３については、正極リード３０および正極タブ５１，５２を接合するかしめ構造５３と実質的に同様であるため、ここでの説明は省略する。負極リード４０が外装フィルム１０の内部においてリード部４０Ｂを含んでいるため、接合部Ｊ２は、上面Ｎ２においてリード部４０Ｂに接続されている。 The negative electrode tabs 61 and 62 are joined to each other to form a joint portion J2. The joint portion J2 is a portion where the other ends of the negative electrode tabs 61 and 62 are joined to each other, and is connected to one end of the negative electrode lead 40 by a caulking structure 63 like the positive electrode tabs 51 and 52. There is. Since the caulking structure 63 is substantially the same as the caulking structure 53 in which the positive electrode leads 30 and the positive electrode tabs 51 and 52 are joined, the description thereof is omitted here. Since the negative electrode lead 40 includes the lead portion 40B inside the exterior film 10, the joint portion J2 is connected to the lead portion 40B on the upper surface N2.
　負極タブ６１，６２のうちの一部（負極タブ６１）は、リード部４０Ｂの表面に沿うように屈曲している。具体的には、負極タブ６１は、下面Ｎ１、側面Ｎ３および上面Ｎ２に順に沿うように屈曲している。これにより、接合部Ｊ２は、上面Ｎ２においてリード部４０Ｂに接続されている。 A part of the negative electrode tabs 61 and 62 (negative electrode tab 61) is bent along the surface of the lead portion 40B. Specifically, the negative electrode tab 61 is bent along the lower surface N1, the side surface N3, and the upper surface N2 in this order. As a result, the joint portion J2 is connected to the lead portion 40B on the upper surface N2.
　より詳細には、負極タブ６１，６２は、電池素子２０と接続された側から負極リード４０のリード部４０Ｂが延在する第１方向に延在する第１延在部Ｆ１と、第１方向と反対の第２方向に延在する第２延在部Ｆ２とを含んでいる。負極タブ６１，６２は、第１延在部Ｆ１を下面Ｎ１に沿わせると共に、第２延在部Ｆ２を上面Ｎ２に沿わせることで、上面Ｎ２においてリード部４０Ｂに接続されている。 More specifically, the negative electrode tabs 61 and 62 have a first extending portion F1 extending in the first direction in which the lead portion 40B of the negative electrode lead 40 extends from the side connected to the battery element 20, and a first direction. The second extending portion F2 extending in the second direction opposite to the above is included. The negative electrode tabs 61 and 62 are connected to the lead portion 40B on the upper surface N2 by having the first extending portion F1 along the lower surface N1 and the second extending portion F2 along the upper surface N2.
　負極タブ６１，６２の各々は、負極集電体２２Ａと同様に銅などの金属材料を含んでいる。ただし、負極タブ６１，６２の各々は、負極集電体２２Ａと同じ金属材料を含んでいてもよく、負極集電体２２Ａと異なる金属材料を含んでいてもよい。 Each of the negative electrode tabs 61 and 62 contains a metal material such as copper as in the negative electrode current collector 22A. However, each of the negative electrode tabs 61 and 62 may contain the same metal material as the negative electrode current collector 22A, or may contain a metal material different from that of the negative electrode current collector 22A.
　負極タブ６１，６２の各々と負極２２との接続位置は、特に限定されない。ただし、負極タブ６１は、箔巻構造を有する負極２２の巻内側の端部（露出部２２ＡＨ）に接続され、かつ負極タブ６２は、箔巻構造を有する負極２２の巻外側の端部（露出部２２ＡＨ）に接続されてもよい。このような場合、負極タブ６１，６２の各々は、正極タブ５１，５２の各々と正極２１との接続位置について説明した場合と同様の理由により、図３に示す負極集電体２２Ａの延在方向の中心に対して左右対称な位置にて、負極集電体２２Ａ（露出部２２ＡＨ）に接続されることが好ましい。これによれば、負極タブ６１，６２は、負極集電体２２Ａによる集電性をより均一化することができるため、負極２２において充放電反応をより均一に進行させることができる。 The connection position between each of the negative electrode tabs 61 and 62 and the negative electrode 22 is not particularly limited. However, the negative electrode tab 61 is connected to the inner end (exposed portion 22AH) of the negative electrode 22 having the foil winding structure, and the negative electrode tab 62 is the outer end (exposed) of the negative electrode 22 having the foil winding structure. It may be connected to the unit 22AH). In such a case, each of the negative electrode tabs 61 and 62 extends the negative electrode current collector 22A shown in FIG. 3 for the same reason as in the case where each of the positive electrode tabs 51 and 52 and the positive electrode 21 are connected to each other. It is preferable that the current collector 22A (exposed portion 22AH) is connected to the negative electrode current collector at a position symmetrical with respect to the center of the direction. According to this, since the negative electrode tabs 61 and 62 can make the current collecting property of the negative electrode current collector 22A more uniform, the charge / discharge reaction can proceed more uniformly in the negative electrode 22.
　なお、図５では、負極タブ６２は、図に正対して右側にて負極集電体２２Ａ（露出部２２ＡＨ）に接続されているが、負極集電体２２Ａに対する負極タブ６２の接続位置は、特に限定されない。一例を挙げると、負極タブ６２は、正極タブ５２について説明した場合と同様に、図５に正対して左側にて負極集電体２２Ａに接続されていてもよい。ただし、負極タブ６２の長さをより短くするためには、負極タブ６２は、図５に正対して右側、すなわち負極リード４０の一端部の先端に近い側にて負極集電体２２Ａに接続されていることが好ましい。 In FIG. 5, the negative electrode tab 62 is connected to the negative electrode current collector 22A (exposed portion 22AH) on the right side facing the figure, but the connection position of the negative electrode tab 62 with respect to the negative electrode current collector 22A is. There is no particular limitation. As an example, the negative electrode tab 62 may be connected to the negative electrode current collector 22A on the left side facing FIG. 5 as in the case where the positive electrode tab 52 is described. However, in order to shorten the length of the negative electrode tab 62, the negative electrode tab 62 is connected to the negative electrode current collector 22A on the right side facing FIG. 5, that is, on the side closer to the tip of one end of the negative electrode lead 40. It is preferable that the electrode is used.
［正極シーラント］
　図４に示すように、正極シーラント７０は、開口部１０Ｋ１を封止することにより、外装フィルム１０の内部に外気が侵入することを防止する。具体的には、正極シーラント７０は、開口部１０Ｋ１において外装フィルム１０と正極リード３０との間に挿入されている。正極シーラント７０は、正極リード３０の周囲を被覆するために、いわゆるチューブ状に設けられてもよい。また、正極シーラント７０の設置範囲は、外装フィルム１０の外部まで拡張されていてもよい。 [Positive sealant]
As shown in FIG. 4, the positive electrode sealant 70 seals the opening 10K1 to prevent outside air from entering the inside of the exterior film 10. Specifically, the positive electrode sealant 70 is inserted between the exterior film 10 and the positive electrode lead 30 in the opening 10K1. The positive electrode sealant 70 may be provided in a so-called tubular shape in order to cover the periphery of the positive electrode lead 30. Further, the installation range of the positive electrode sealant 70 may be extended to the outside of the exterior film 10.
　正極シーラント７０は、高分子材料などの絶縁性材料のうちのいずれか１種類または２種類以上を含んでいてもよい。高分子材料は、正極リード３０に対して密着性を有するポリオレフィンなどである。ポリオレフィンの種類は、特に限定されないが、ポリエチレン、ポリプロピレン、変性ポリエチレンおよび変性ポリプロピレンなどである。 The positive electrode sealant 70 may contain any one or more of insulating materials such as polymer materials. The polymer material is polyolefin or the like having adhesion to the positive electrode lead 30. The type of polyolefin is not particularly limited, and includes polyethylene, polypropylene, modified polyethylene, modified polypropylene, and the like.
　上記したように、外装フィルム１０が熱融着可能な融着層を含んでいる場合、正極シーラント７０は、融着層と同様に熱融着可能な高分子材料を含むことで、開口部１０Ｋ１にて外装フィルム１０と熱融着されることが好ましい。これは、外装フィルム１０と正極シーラント７０との熱融着を利用することで、開口部１０Ｋ１に正極リード３０が存在する場合でも開口部１０Ｋ１を封止しやすいためである。 As described above, when the exterior film 10 includes a heat-sealing fusing layer, the positive electrode sealant 70 contains a heat-sealing polymer material similar to the fusing layer, so that the opening 10K1 It is preferable that the film is heat-sealed with the exterior film 10. This is because by utilizing the heat fusion between the exterior film 10 and the positive electrode sealant 70, it is easy to seal the opening 10K1 even when the positive electrode lead 30 is present in the opening 10K1.
［負極シーラント］
　図５に示すように、負極シーラント８０は、上記した正極シーラント７０と同様の構成を有している。すなわち、負極シーラント８０は、開口部１０Ｋ２を封止することにより、外装フィルム１０の内部に外気が侵入することを防止する。具体的には、負極シーラント８０は、開口部１０Ｋ２において外装フィルム１０と負極リード４０との間に挿入されている。負極シーラント８０は、負極リード４０の周囲を被覆するために、いわゆるチューブ状に設けられてもよい。また、負極シーラント８０の設置範囲は、外装フィルム１０の外部まで拡張されていてもよい。 [Negative electrode sealant]
As shown in FIG. 5, the negative electrode sealant 80 has the same configuration as the positive electrode sealant 70 described above. That is, the negative electrode sealant 80 prevents outside air from entering the inside of the exterior film 10 by sealing the opening 10K2. Specifically, the negative electrode sealant 80 is inserted between the exterior film 10 and the negative electrode lead 40 in the opening 10K2. The negative electrode sealant 80 may be provided in a so-called tubular shape in order to cover the periphery of the negative electrode lead 40. Further, the installation range of the negative electrode sealant 80 may be extended to the outside of the exterior film 10.
　負極シーラント８０は、高分子材料などの絶縁性材料のうちのいずれか１種類または２種類以上を含んでいてもよい。高分子材料は、負極リード４０に対して密着性を有するポリオレフィンなどである。ポリオレフィンの種類は、特に限定されないが、ポリエチレン、ポリプロピレン、変性ポリエチレンおよび変性ポリプロピレンなどである。 The negative electrode sealant 80 may contain any one or more of insulating materials such as polymer materials. The polymer material is polyolefin or the like having adhesion to the negative electrode lead 40. The type of polyolefin is not particularly limited, and includes polyethylene, polypropylene, modified polyethylene, modified polypropylene, and the like.
　上記したように、外装フィルム１０が熱融着可能な融着層を含んでいる場合、負極シーラント８０は、融着層と同様に熱融着可能な高分子材料を含むことで、開口部１０Ｋ２にて外装フィルム１０と熱融着されていることが好ましい。これは、外装フィルム１０と負極シーラント８０との熱融着を利用することで、開口部１０Ｋ２に負極リード４０が存在する場合でも開口部１０Ｋ２を封止しやすいためである。 As described above, when the exterior film 10 includes a heat-sealing fusing layer, the negative electrode sealant 80 contains a heat-sealing polymer material similar to the fusing layer, so that the opening 10K2 It is preferable that the film is heat-sealed with the exterior film 10. This is because by utilizing the heat fusion between the exterior film 10 and the negative electrode sealant 80, it is easy to seal the opening 10K2 even when the negative electrode lead 40 is present in the opening 10K2.
［正極絶縁テープ］
　正極絶縁テープ９０は、外装フィルム１０の内部、かつ電池素子２０の外部に配置されている第１絶縁部材である。 [Positive electrode insulating tape]
The positive electrode insulating tape 90 is a first insulating member arranged inside the exterior film 10 and outside the battery element 20.
　図４に示すように、正極絶縁テープ９０は、リード部３０Ｂと正極タブ５０（５１，５２）のうちの一部（正極タブ５１）との間に下面Ｍ１に沿うように配置されている。さらに、正極絶縁テープ９０は、下面Ｍ１に沿いながら、リード部３０Ｂと電池素子２０との間まで配置されている。正極絶縁テープ９０は、正極リード３０と電池素子２０との間に介在することで、電池素子２０（負極２２）から正極リード３０を電気的に絶縁することができる。これにより、正極絶縁テープ９０は、正極リード３０と電池素子２０との短絡を防止することができる。 As shown in FIG. 4, the positive electrode insulating tape 90 is arranged along the lower surface M1 between the lead portion 30B and a part (positive electrode tab 51) of the positive electrode tabs 50 (51, 52). Further, the positive electrode insulating tape 90 is arranged along the lower surface M1 up to between the lead portion 30B and the battery element 20. The positive electrode insulating tape 90 can electrically insulate the positive electrode lead 30 from the battery element 20 (negative electrode 22) by interposing the positive electrode insulating tape 90 between the positive electrode lead 30 and the battery element 20. As a result, the positive electrode insulating tape 90 can prevent a short circuit between the positive electrode lead 30 and the battery element 20.
　正極絶縁テープ９０は、下面Ｍ１だけでなく、さらに側面Ｍ３まで沿うように配置されていることが好ましい。これによれば、正極絶縁テープ９０は、正極リード３０（リード部３０Ｂ）の先端、すなわち下面Ｍ１と側面Ｍ３とにより形成される角部を保護することができるため、角部との接触に起因して正極タブ５１が破損することを防止することができる。 It is preferable that the positive electrode insulating tape 90 is arranged not only along the lower surface M1 but also along the side surface M3. According to this, the positive electrode insulating tape 90 can protect the tip of the positive electrode lead 30 (lead portion 30B), that is, the corner portion formed by the lower surface M1 and the side surface M3, which is caused by the contact with the corner portion. Therefore, it is possible to prevent the positive electrode tab 51 from being damaged.
　正極絶縁テープ９０は、高分子材料などの絶縁性材料のうちのいずれか１種類または２種類以上を含んでいる。高分子材料は、ポリエチレン、ポリエチレンテレフタレートおよびポリイミドなどである。 The positive electrode insulating tape 90 contains any one or more of insulating materials such as polymer materials. Polymer materials include polyethylene, polyethylene terephthalate and polyimide.
　正極絶縁テープ９０は、正極リード３０（リード部３０Ｂ）に接着されていると共に、正極タブ５１に接着されていることが好ましい。このような場合、正極絶縁テープ９０は、リード部３０Ｂおよび正極タブ５１の双方に対して位置が固定されるため、二次電池が振動および衝撃などの外的負荷を受けた場合でも、意図した位置からずれにくくなる。したがって、二次電池では、リード部３０Ｂと正極タブ５１との間に正極絶縁テープ９０が介在している状態は維持されやすくなるため、正極リード３０と電池素子２０（負極２２）との短絡が発生する可能性をより低減することができる。 It is preferable that the positive electrode insulating tape 90 is adhered to the positive electrode lead 30 (lead portion 30B) and also to the positive electrode tab 51. In such a case, since the position of the positive electrode insulating tape 90 is fixed with respect to both the lead portion 30B and the positive electrode tab 51, it is intended even when the secondary battery receives an external load such as vibration or shock. It becomes difficult to shift from the position. Therefore, in the secondary battery, the state in which the positive electrode insulating tape 90 is interposed between the lead portion 30B and the positive electrode tab 51 is easily maintained, so that the positive electrode lead 30 and the battery element 20 (negative electrode 22) are short-circuited. The possibility of occurrence can be further reduced.
　正極絶縁テープ９０は、リード部３０Ｂおよび正極タブ５１のそれぞれに粘着剤を介して接着されていてもよい。粘着剤の種類は、特に限定されないが、アクリル系粘着剤およびゴム系粘着剤などのうちのいずれか１種類または２種類以上を用いることができる。または、正極絶縁テープ９０は、両面粘着テープであってもよい。もしくは、正極絶縁テープ９０は、リード部３０Ｂおよび正極タブ５１のそれぞれに熱融着されていてもよい。 The positive electrode insulating tape 90 may be adhered to each of the lead portion 30B and the positive electrode tab 51 via an adhesive. The type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used. Alternatively, the positive electrode insulating tape 90 may be a double-sided adhesive tape. Alternatively, the positive electrode insulating tape 90 may be heat-sealed to each of the lead portion 30B and the positive electrode tab 51.
　正極絶縁テープ１００は、外装フィルム１０の内部、かつ電池素子２０の外部に配置されている第２絶縁部材である。 The positive electrode insulating tape 100 is a second insulating member arranged inside the exterior film 10 and outside the battery element 20.
　図４に示すように、正極絶縁テープ１００は、接合部Ｊ１と外装フィルム１０との間に配置されている。正極絶縁テープ１００は、かしめ構造５３を覆うことで、かしめ構造５３に起因する短絡または電池素子２０の損傷を防止することができる。 As shown in FIG. 4, the positive electrode insulating tape 100 is arranged between the joint portion J1 and the exterior film 10. By covering the caulking structure 53, the positive electrode insulating tape 100 can prevent a short circuit or damage to the battery element 20 due to the caulking structure 53.
　正極絶縁テープ１００の形成材料は、正極絶縁テープ９０の形成材料と同様である。正極絶縁テープ１００の形成材料は、正極絶縁テープ９０の形成材料と同じであってもよく、正極絶縁テープ９０の形成材料と異なっていてもよい。 The material for forming the positive electrode insulating tape 100 is the same as the material for forming the positive electrode insulating tape 90. The forming material of the positive electrode insulating tape 100 may be the same as the forming material of the positive electrode insulating tape 90, or may be different from the forming material of the positive electrode insulating tape 90.
　正極絶縁テープ１００は、接合部Ｊ１および外装フィルム１０の双方に接着されていることが好ましい。このような場合、正極絶縁テープ１００は、接合部Ｊ１および外装フィルム１０の双方に対して位置が固定されるため、二次電池が振動および衝撃などの外的負荷を受けた場合でも、意図した位置からずれにくくなる。したがって、正極絶縁テープ１００は、かしめ構造５３に起因する短絡または電池素子２０の損傷をより確実に防止することができる。 The positive electrode insulating tape 100 is preferably adhered to both the joint portion J1 and the exterior film 10. In such a case, since the position of the positive electrode insulating tape 100 is fixed with respect to both the joint portion J1 and the exterior film 10, it is intended even when the secondary battery receives an external load such as vibration or shock. It becomes difficult to shift from the position. Therefore, the positive electrode insulating tape 100 can more reliably prevent a short circuit or damage to the battery element 20 due to the caulking structure 53.
　正極絶縁テープ１００は、接合部Ｊ１および外装フィルム１０のそれぞれに粘着剤を介して接着されていてもよい。粘着剤の種類は、特に限定されないが、アクリル系粘着剤およびゴム系粘着剤などのうちのいずれか１種類または２種類以上を用いることができる。または、正極絶縁テープ１００は、両面粘着テープであってもよい。もしくは、正極絶縁テープ１００は、接合部Ｊ１および外装フィルム１０のそれぞれに熱融着されていてもよい。 The positive electrode insulating tape 100 may be adhered to each of the joint portion J1 and the exterior film 10 via an adhesive. The type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used. Alternatively, the positive electrode insulating tape 100 may be a double-sided adhesive tape. Alternatively, the positive electrode insulating tape 100 may be heat-sealed to each of the joint portion J1 and the exterior film 10.
［負極絶縁テープ］
　負極絶縁テープ１１０は、上記した正極絶縁テープ９０と同様の構成を有している。すなわち、負極絶縁テープ１１０は、外装フィルム１０の内部、かつ電池素子２０の外部に配置されている第１絶縁部材である。 [Negative electrode insulating tape]
The negative electrode insulating tape 110 has the same configuration as the positive electrode insulating tape 90 described above. That is, the negative electrode insulating tape 110 is a first insulating member arranged inside the exterior film 10 and outside the battery element 20.
　図５に示すように、負極絶縁テープ１１０は、リード部４０Ｂと負極タブ６０（６１，６２）のうちの一部（負極タブ６１）との間に下面Ｎ１に沿うように配置されている。さらに、負極絶縁テープ１１０は、下面Ｎ１に沿いながら、リード部４０Ｂと電池素子２０との間まで配置されている。負極絶縁テープ１１０は、負極リード４０と電池素子２０との間に介在することで、電池素子２０（正極２１）から負極リード４０を電気的に絶縁することができる。これにより、負極絶縁テープ１１０は、負極リード４０と電池素子２０との短絡を防止することができる。 As shown in FIG. 5, the negative electrode insulating tape 110 is arranged along the lower surface N1 between the lead portion 40B and a part of the negative electrode tabs 60 (61, 62) (negative electrode tab 61). Further, the negative electrode insulating tape 110 is arranged along the lower surface N1 to the space between the lead portion 40B and the battery element 20. The negative electrode insulating tape 110 can electrically insulate the negative electrode lead 40 from the battery element 20 (positive electrode 21) by interposing the negative electrode insulating tape 110 between the negative electrode lead 40 and the battery element 20. As a result, the negative electrode insulating tape 110 can prevent a short circuit between the negative electrode lead 40 and the battery element 20.
　負極絶縁テープ１１０は、下面Ｎ１だけでなく、さらに側面Ｎ３まで沿うように配置されていることが好ましい。これによれば、負極絶縁テープ１１０は、負極リード４０（リード部４０Ｂ）の先端、すなわち下面Ｎ１と側面Ｎ３とにより形成される角部を保護することができるため、角部との接触に起因して負極タブ６１が破損することを防止することができる。 It is preferable that the negative electrode insulating tape 110 is arranged not only along the lower surface N1 but also along the side surface N3. According to this, the negative electrode insulating tape 110 can protect the tip of the negative electrode lead 40 (lead portion 40B), that is, the corner portion formed by the lower surface N1 and the side surface N3, and thus is caused by the contact with the corner portion. Therefore, it is possible to prevent the negative electrode tab 61 from being damaged.
　負極絶縁テープ１１０は、高分子材料などの絶縁性材料のうちのいずれか１種類または２種類以上を含んでいる。高分子材料は、ポリエチレン、ポリエチレンテレフタレートおよびポリイミドなどである。 The negative electrode insulating tape 110 contains any one or more of insulating materials such as polymer materials. Polymer materials include polyethylene, polyethylene terephthalate and polyimide.
　負極絶縁テープ１１０は、負極リード４０（リード部４０Ｂ）に接着されていると共に、負極タブ６１に接着されていることが好ましい。このような場合、負極絶縁テープ１１０は、リード部４０Ｂおよび負極タブ６１の双方に対して位置が固定されるため、正極絶縁テープ９０について説明した場合と同様の理由により、負極リード４０と電池素子２０（負極２２）との短絡が発生する可能性をより低減することができる。 It is preferable that the negative electrode insulating tape 110 is adhered to the negative electrode lead 40 (lead portion 40B) and also to the negative electrode tab 61. In such a case, since the position of the negative electrode insulating tape 110 is fixed with respect to both the lead portion 40B and the negative electrode tab 61, the negative electrode lead 40 and the battery element are used for the same reason as described for the positive electrode insulating tape 90. The possibility of a short circuit with 20 (negative electrode 22) can be further reduced.
　負極絶縁テープ１１０は、リード部４０Ｂおよび負極タブ６１のそれぞれに粘着剤を介して接着されていてもよい。粘着剤の種類は、特に限定されないが、アクリル系粘着剤およびゴム系粘着剤などのうちのいずれか１種類または２種類以上を用いることができる。または、負極絶縁テープ１１０は、両面粘着テープであってもよい。もしくは、負極絶縁テープ１１０は、リード部４０Ｂおよび負極タブ６１のそれぞれに熱融着されていてもよい。 The negative electrode insulating tape 110 may be adhered to each of the lead portion 40B and the negative electrode tab 61 via an adhesive. The type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used. Alternatively, the negative electrode insulating tape 110 may be a double-sided adhesive tape. Alternatively, the negative electrode insulating tape 110 may be heat-sealed to each of the lead portion 40B and the negative electrode tab 61.
　負極絶縁テープ１２０は、上記した正極絶縁テープ１００の構成と同様の構成を有している。すなわち、負極絶縁テープ１２０は、外装フィルム１０の内部、かつ電池素子２０の外部に配置されている第２絶縁部材である。 The negative electrode insulating tape 120 has the same configuration as that of the positive electrode insulating tape 100 described above. That is, the negative electrode insulating tape 120 is a second insulating member arranged inside the exterior film 10 and outside the battery element 20.
　図５に示すように、負極絶縁テープ１２０は、接合部Ｊ２と外装フィルム１０との間に配置されている。負極絶縁テープ１２０は、かしめ構造６３を覆うことで、かしめ構造６３に起因する短絡または電池素子２０の損傷を防止することができる。 As shown in FIG. 5, the negative electrode insulating tape 120 is arranged between the joint portion J2 and the exterior film 10. By covering the caulking structure 63, the negative electrode insulating tape 120 can prevent a short circuit or damage to the battery element 20 due to the caulking structure 63.
　負極絶縁テープ１２０の形成材料は、負極絶縁テープ１１０の形成材料と同様である。負極絶縁テープ１２０の形成材料は、負極絶縁テープ１１０の形成材料と同じであってもよく、負極絶縁テープ１１０の形成材料と異なっていてもよい。 The material for forming the negative electrode insulating tape 120 is the same as the material for forming the negative electrode insulating tape 110. The material for forming the negative electrode insulating tape 120 may be the same as the material for forming the negative electrode insulating tape 110, or may be different from the material for forming the negative electrode insulating tape 110.
　負極絶縁テープ１２０は、接合部Ｊ２および外装フィルム１０の双方に接着されていることが好ましい。このような場合、負極絶縁テープ１２０は、接合部Ｊ２および外装フィルム１０の双方に対して位置が固定されるため、正極絶縁テープ１００に関して説明した場合と同様の理由により、かしめ構造６３に起因する短絡または電池素子２０の損傷をより確実に防止することができる。 The negative electrode insulating tape 120 is preferably adhered to both the joint portion J2 and the exterior film 10. In such a case, since the position of the negative electrode insulating tape 120 is fixed with respect to both the joint portion J2 and the exterior film 10, it is caused by the caulking structure 63 for the same reason as described with respect to the positive electrode insulating tape 100. It is possible to more reliably prevent a short circuit or damage to the battery element 20.
　負極絶縁テープ１２０は、接合部Ｊ２および外装フィルム１０のそれぞれに粘着剤を介して接着されていてもよい。粘着剤の種類は、特に限定されないが、アクリル系粘着剤およびゴム系粘着剤などのうちのいずれか１種類または２種類以上を用いることができる。または、負極絶縁テープ１２０は、両面粘着テープであってもよい。もしくは、負極絶縁テープ１２０は、接合部Ｊ２および外装フィルム１０のそれぞれに熱融着されていてもよい。 The negative electrode insulating tape 120 may be adhered to each of the joint portion J2 and the exterior film 10 via an adhesive. The type of the pressure-sensitive adhesive is not particularly limited, but any one or more of the acrylic pressure-sensitive adhesive and the rubber-based pressure-sensitive adhesive can be used. Alternatively, the negative electrode insulating tape 120 may be a double-sided adhesive tape. Alternatively, the negative electrode insulating tape 120 may be heat-sealed to each of the joint portion J2 and the exterior film 10.
［補助絶縁テープ］
　補助絶縁テープ１３０は、外装フィルム１０の内部、かつ電池素子２０の内部に配置されている。補助絶縁テープ１３０は、電池素子２０のうちの互いに隣り合う導電性部品の間に介在されることにより、導電性部品同士を電気的に絶縁する。図４および図５では、一例として、６個の補助絶縁テープ１３０（１３１～１３６）を示す。 [Auxiliary insulating tape]
The auxiliary insulating tape 130 is arranged inside the exterior film 10 and inside the battery element 20. The auxiliary insulating tape 130 electrically insulates the conductive parts from each other by being interposed between the conductive parts adjacent to each other in the battery element 20. In FIGS. 4 and 5, six auxiliary insulating tapes 130 (131 to 136) are shown as an example.
　図４に示すように、補助絶縁テープ１３１～１３３は、正極タブ５１，５２を周囲の構成から電気的に絶縁する。具体的には、補助絶縁テープ１３１は、電池素子２０の巻内側の端部近傍にて正極タブ５１と負極集電体２２Ａとの間に介在して設けられ、正極タブ５１に沿って延在する。補助絶縁テープ１３２は、電池素子２０の巻内側の端部近傍にて正極集電体２１Ａとセパレータ２３との間に介在して設けられ、正極タブ５１に沿って延在する。補助絶縁テープ１３３は、電池素子２０の巻外側の端部近傍にて正極タブ５２とセパレータ２３との間に介在して設けられる。 As shown in FIG. 4, the auxiliary insulating tapes 131 to 133 electrically insulate the positive electrode tabs 51 and 52 from the surrounding configuration. Specifically, the auxiliary insulating tape 131 is provided between the positive electrode tab 51 and the negative electrode current collector 22A near the end of the winding inside of the battery element 20, and extends along the positive electrode tab 51. do. The auxiliary insulating tape 132 is provided between the positive electrode current collector 21A and the separator 23 near the end of the winding inside of the battery element 20, and extends along the positive electrode tab 51. The auxiliary insulating tape 133 is provided between the positive electrode tab 52 and the separator 23 in the vicinity of the outer end of the battery element 20.
　図５に示すように、補助絶縁テープ１３４～１３６は、負極タブ６１，６２を周囲の構成から電気的に絶縁する。具体的には、補助絶縁テープ１３４は、電池素子２０の巻内側の端部近傍にて負極集電体２２Ａとセパレータ２３との間に介在して設けられ、負極タブ６１に沿って延在する。補助絶縁テープ１３５は、電池素子２０の巻内側の端部近傍にて負極タブ６１と正極集電体２１Ａとの間に介在して設けられ、負極タブ６１に沿って延在する。補助絶縁テープ１３６は、電池素子２０の巻外側の端部近傍において負極タブ６２とセパレータ２３との間に介在して設けられる。 As shown in FIG. 5, the auxiliary insulating tapes 134 to 136 electrically insulate the negative electrode tabs 61 and 62 from the surrounding configuration. Specifically, the auxiliary insulating tape 134 is provided between the negative electrode current collector 22A and the separator 23 near the end of the winding inside of the battery element 20, and extends along the negative electrode tab 61. .. The auxiliary insulating tape 135 is provided between the negative electrode tab 61 and the positive electrode current collector 21A near the end of the winding inside of the battery element 20, and extends along the negative electrode tab 61. The auxiliary insulating tape 136 is provided between the negative electrode tab 62 and the separator 23 in the vicinity of the outer end of the battery element 20.
　補助絶縁テープ１３１～１３６の各々は、高分子材料などの絶縁性材料のうちのいずれか１種類または２種類以上を含んでいてもよい。高分子材料は、ポリエチレン、ポリエチレンテレフタレートおよびポリイミドなどである。 Each of the auxiliary insulating tapes 131 to 136 may contain any one type or two or more types of insulating materials such as polymer materials. Polymer materials include polyethylene, polyethylene terephthalate and polyimide.
＜１－２．動作＞
　充電時には、二次電池では、電池素子２０の正極２１からリチウムが放出されると共に、リチウムが電解液を介して負極２２に吸蔵される。また、放電時には、二次電池では、電池素子２０の負極２２からリチウムが放出されると共に、リチウムが電解液を介して正極２１に吸蔵される。これらの充放電時には、リチウムは、イオン状態で吸蔵および放出される。 <1-2. Operation>
At the time of charging, in the secondary battery, lithium is discharged from the positive electrode 21 of the battery element 20, and lithium is occluded in the negative electrode 22 via the electrolytic solution. Further, at the time of discharging, in the secondary battery, lithium is discharged from the negative electrode 22 of the battery element 20, and lithium is occluded in the positive electrode 21 via the electrolytic solution. During these charges and discharges, lithium is occluded and released in the ionic state.
＜１－３．製造方法＞
　なお、以下の製造方法の説明では、正極絶縁テープ９０，１００および負極絶縁テープ１１０，１２０に両面粘着テープがそれぞれ用いられる場合について説明する。 <1-3. Manufacturing method>
In the following description of the manufacturing method, a case where double-sided adhesive tapes are used for the positive electrode insulating tapes 90 and 100 and the negative electrode insulating tapes 110 and 120, respectively, will be described.
［正極の作製］
　まず、正極活物質と、必要に応じて正極結着剤および正極導電剤などとを混合することで正極合剤としたのち、正極合剤を有機溶剤などに投入することにより、ペースト状の正極合剤スラリーを調製する。次に、正極集電体２１Ａの両面に正極合剤スラリーを塗布することにより、正極活物質層２１Ｂを形成する。正極活物質層２１Ｂは、ロールプレス機などを用いてその後圧縮成型されてもよい。さらに、正極活物質層２１Ｂは、加熱されてもよく、複数回繰り返し圧縮成型されてもよい。これにより、正極集電体２１Ａの両面に正極活物質層２１Ｂが形成された正極２１が作製される。 [Preparation of positive electrode]
First, the positive electrode active material is mixed with a positive electrode binder and a positive electrode conductive agent as needed to form a positive electrode mixture, and then the positive electrode mixture is added to an organic solvent or the like to form a paste-like positive electrode. Prepare a mixture slurry. Next, the positive electrode active material layer 21B is formed by applying the positive electrode mixture slurry on both sides of the positive electrode current collector 21A. The positive electrode active material layer 21B may be subsequently compression-molded using a roll press or the like. Further, the positive electrode active material layer 21B may be heated or may be repeatedly compression-molded a plurality of times. As a result, the positive electrode 21 in which the positive electrode active material layers 21B are formed on both sides of the positive electrode current collector 21A is produced.
［負極の作製］
　上記した正極２１の作製手順と同様の手順により、負極集電体２２Ａの両面に負極活物質層２２Ｂを形成する。具体的には、負極活物質と、必要に応じて負極結着剤および負極導電剤などとを混合することで負極合剤としたのち、負極合剤を有機溶剤などに投入することにより、ペースト状の負極合剤スラリーを調製する。次に、負極集電体２２Ａの両面に負極合剤スラリーを塗布することにより、負極活物質層２２Ｂを形成する。負極活物質層２２Ｂは、その後圧縮成型されてもよい。これにより、負極集電体２２Ａの両面に負極活物質層２２Ｂが形成された負極２２が作製される。 [Preparation of negative electrode]
The negative electrode active material layers 22B are formed on both sides of the negative electrode current collector 22A by the same procedure as the procedure for manufacturing the positive electrode 21 described above. Specifically, the negative electrode active material is mixed with a negative electrode binder and a negative electrode conductive agent as needed to form a negative electrode mixture, and then the negative electrode mixture is added to an organic solvent or the like to make a paste. Prepare a negative electrode mixture slurry. Next, the negative electrode active material layer 22B is formed by applying the negative electrode mixture slurry on both sides of the negative electrode current collector 22A. The negative electrode active material layer 22B may then be compression molded. As a result, the negative electrode 22 in which the negative electrode active material layers 22B are formed on both sides of the negative electrode current collector 22A is produced.
［電解液の調製］
　溶媒に電解質塩を投入し、溶媒中に電解質塩を分散または溶解させることで、電解液を調製する。 [Preparation of electrolyte]
An electrolytic solution is prepared by adding an electrolyte salt to a solvent and dispersing or dissolving the electrolyte salt in the solvent.
［二次電池の組み立て］
　まず、溶接法などを用いて、正極２１（正極集電体２１Ａ）に正極タブ５１，５２を接続し、負極２２（負極集電体２２Ａ）に負極タブ６１，６２を接続する。なお、溶接法は、レーザ溶接法および抵抗溶接法などのうちのいずれか１種類または２種類以上を用いることができる。 [Assembly of secondary battery]
First, the positive electrode tabs 51 and 52 are connected to the positive electrode 21 (positive electrode current collector 21A) and the negative electrode tabs 61 and 62 are connected to the negative electrode 22 (negative electrode current collector 22A) by using a welding method or the like. As the welding method, any one or more of the laser welding method and the resistance welding method can be used.
　続いて、セパレータ２３を介して正極２１および負極２２を交互に積層させたのち、正極２１、負極２２およびセパレータ２３の積層体を巻回することにより、電池素子２０を作製する。このとき、電池素子２０の作製時（巻回時）において、巻回途中の適切な位置に補助絶縁テープ１３０を挿入する。 Subsequently, the positive electrode 21 and the negative electrode 22 are alternately laminated via the separator 23, and then the laminated body of the positive electrode 21, the negative electrode 22 and the separator 23 is wound to produce the battery element 20. At this time, when the battery element 20 is manufactured (during winding), the auxiliary insulating tape 130 is inserted at an appropriate position during winding.
　続いて、かしめ構造５３によって正極タブ５１，５２の各々の一端部と、正極リード３０（リード部３０Ｂ）の一端部とを接続する。具体的には、正極タブ５１，５２の各々の一端部と、正極リード３０（リード部３０Ｂ）の一端部とを互いに重ね合わせたうえで、正極タブ５１，５２および正極リード３０を貫通する貫通孔５３Ａを形成する。その後、貫通孔５３Ａを通って正極リード３０の一部を正極タブ５１，５２側に折り返し、正極タブ５１，５２をかしめさせることで、かしめ構造５３が形成される。 Subsequently, one end of each of the positive electrode tabs 51 and 52 is connected to one end of the positive electrode lead 30 (lead portion 30B) by the caulking structure 53. Specifically, one end of each of the positive electrode tabs 51 and 52 and one end of the positive electrode lead 30 (lead portion 30B) are overlapped with each other, and then penetrate the positive electrode tabs 51 and 52 and the positive electrode lead 30. The hole 53A is formed. After that, a part of the positive electrode lead 30 is folded back to the positive electrode tabs 51 and 52 side through the through hole 53A, and the positive electrode tabs 51 and 52 are crimped to form the crimping structure 53.
　図７Ａ～図７Ｃを参照して、かしめ構造５３の一例について説明する。図７Ａ～図７Ｃは、かしめ構造５３の第１～第３の例を示す模式図である。 An example of the caulking structure 53 will be described with reference to FIGS. 7A to 7C. 7A to 7C are schematic views showing first to third examples of the caulking structure 53.
　図７Ａ～図７Ｃに示すように、かしめ構造５３は、正極リード３０および正極タブ５１，５２の長手方向と直交する方向に並んで複数設けられてもよい。かしめ構造５３が複数設けられる場合、接続された正極リード３０および正極タブ５１，５２の相対的な向きを固定することができる。これによれば、かしめ構造５３は、正極リード３０および正極タブ５１，５２をより強固に接続することが可能となる。したがって、二次電池は、外部負荷による内部配線の破断の可能性をより低減することができる。 As shown in FIGS. 7A to 7C, a plurality of caulking structures 53 may be provided side by side in a direction orthogonal to the longitudinal direction of the positive electrode leads 30 and the positive electrode tabs 51 and 52. When a plurality of caulking structures 53 are provided, the relative orientations of the connected positive electrode leads 30 and the positive electrode tabs 51 and 52 can be fixed. According to this, the caulking structure 53 can connect the positive electrode lead 30 and the positive electrode tabs 51 and 52 more firmly. Therefore, the secondary battery can further reduce the possibility of breaking the internal wiring due to an external load.
　かしめ構造５３を形成するための貫通孔５３Ａの大きさは、０．５ｍｍ以上であってもよい。このような場合、貫通孔５３Ａを通って正極リード３０の一部を正極タブ５１，５２側に折り返し、正極タブ５１，５２をかしめさせることをより容易に行うことができるようになる。 The size of the through hole 53A for forming the caulking structure 53 may be 0.5 mm or more. In such a case, a part of the positive electrode leads 30 can be folded back toward the positive electrode tabs 51 and 52 through the through hole 53A, and the positive electrode tabs 51 and 52 can be crimped more easily.
　また、かしめ構造５３を形成するための貫通孔５３Ａの形状は、多角形であることが好ましい。一例を挙げると、貫通孔５３Ａの形状は、図７Ａに示すように四角形であってもよく、図７Ｂに示すように五角形であってもよく、図７Ｃに示すように六角形であってもよい。このような場合、かしめ構造５３では、貫通孔５３Ａを通って正極リード３０の一部を正極タブ５１，５２側に折り返した際に、折り返した正極リード３０が盛り上がって突起状になることを防止することができる。これによれば、かしめ構造５３は、外的負荷によって他の構成を破損させる可能性をより低減することができるため、外的負荷による内部配線の短絡または破断の可能性をより低減することができる。 Further, the shape of the through hole 53A for forming the caulking structure 53 is preferably polygonal. As an example, the shape of the through hole 53A may be a quadrangle as shown in FIG. 7A, a pentagon as shown in FIG. 7B, or a hexagon as shown in FIG. 7C. good. In such a case, in the caulking structure 53, when a part of the positive electrode lead 30 is folded back to the positive electrode tabs 51 and 52 side through the through hole 53A, the folded positive electrode lead 30 is prevented from rising and forming a protrusion. can do. According to this, since the caulking structure 53 can further reduce the possibility of damaging other configurations by an external load, the possibility of short-circuiting or breaking of the internal wiring due to the external load can be further reduced. can.
　負極リード４０および負極タブ６１，６２についても、正極リード３０および正極タブ５１，５２と同様に、かしめ構造６３による接続を行う。具体的には、かしめ構造６３によって負極タブ６１，６２の各々の一端部と、負極リード４０（リード部４０Ｂ）の一端部とを接続する。かしめ構造６３については、かしめ構造５３と実質的に同様であるため、ここでの説明は省略する。 The negative electrode leads 40 and the negative electrode tabs 61 and 62 are also connected by the caulking structure 63 in the same manner as the positive electrode leads 30 and the positive electrode tabs 51 and 52. Specifically, the caulking structure 63 connects one end of each of the negative electrode tabs 61 and 62 to one end of the negative electrode lead 40 (lead portion 40B). Since the caulking structure 63 is substantially the same as the caulking structure 53, the description thereof is omitted here.
　これにより、電池素子２０に正極配線２００（正極リード３０および正極タブ５１，５２）および負極配線３００（負極リード４０および負極タブ６１，６２）のそれぞれが接続される。 As a result, the positive electrode wiring 200 (positive electrode lead 30 and positive electrode tabs 51 and 52) and the negative electrode wiring 300 (negative electrode lead 40 and negative electrode tabs 61 and 62) are connected to the battery element 20, respectively.
　続いて、外装フィルム１０の内部に、正極配線２００および負極配線３００のそれぞれが接続された電池素子２０を収納する。 Subsequently, the battery element 20 to which the positive electrode wiring 200 and the negative electrode wiring 300 are connected is housed inside the exterior film 10.
　このとき、リード部３０Ｂの下面Ｍ１、側面Ｍ３および上面Ｍ２に順に沿うように正極タブ５１を屈曲させると共に、リード部４０Ｂの下面Ｎ１、側面Ｎ３および上面Ｎ２に順に沿うように負極タブ６１を屈曲させる。 At this time, the positive electrode tab 51 is bent along the lower surface M1, the side surface M3, and the upper surface M2 of the lead portion 30B in order, and the negative electrode tab 61 is bent along the lower surface N1, the side surface N3, and the upper surface N2 of the lead portion 40B in order. Let me.
　また、リード部３０Ｂの下面Ｍ１に沿うように正極絶縁テープ９０を配置することにより、正極絶縁テープ９０をリード部３０Ｂおよび正極タブ５１の各々に接着させる。リード部４０Ｂの下面Ｎ１に沿うように負極絶縁テープ１１０を配置することにより、負極絶縁テープ１１０をリード部４０Ｂおよび負極タブ６１の各々に接着させる。 Further, by arranging the positive electrode insulating tape 90 along the lower surface M1 of the lead portion 30B, the positive electrode insulating tape 90 is adhered to each of the lead portion 30B and the positive electrode tab 51. By arranging the negative electrode insulating tape 110 along the lower surface N1 of the lead portion 40B, the negative electrode insulating tape 110 is adhered to each of the lead portion 40B and the negative electrode tab 61.
　さらに、接合部Ｊ１と外装フィルム１０との間に正極絶縁テープ１００を配置することにより、正極絶縁テープ１００を接合部Ｊ１および外装フィルム１０の各々に接着させる。接合部Ｊ２と外装フィルム１０との間に負極絶縁テープ１２０を配置することにより、負極絶縁テープ１２０を接合部Ｊ２および外装フィルム１０の各々に接着させる。 Further, by arranging the positive electrode insulating tape 100 between the joint portion J1 and the exterior film 10, the positive positive insulating tape 100 is adhered to each of the joint portion J1 and the exterior film 10. By arranging the negative electrode insulating tape 120 between the joint portion J2 and the exterior film 10, the negative negative insulating tape 120 is adhered to each of the joint portion J2 and the exterior film 10.
　続いて、外装フィルム１０の内部に電解液を注入したのち、熱融着法を用いて開口部にて互いに対向している外装フィルム１０同士を接合する。 Subsequently, after injecting an electrolytic solution into the exterior film 10, the exterior films 10 facing each other at the openings are joined to each other by a heat fusion method.
　このとき、開口部１０Ｋ１にて外装フィルム１０と正極配線２００との間に正極シーラント７０を挿入すると共に、開口部１０Ｋ２にて外装フィルム１０と負極配線３００との間に負極シーラント８０を挿入する。これにより、開口部１０Ｋ１が正極シーラント７０を介して封止され、開口部１０Ｋ２が負極シーラント８０を介して封止される。 At this time, the positive electrode sealant 70 is inserted between the exterior film 10 and the positive electrode wiring 200 at the opening 10K1, and the negative electrode sealant 80 is inserted between the exterior film 10 and the negative electrode wiring 300 at the opening 10K2. As a result, the opening 10K1 is sealed via the positive electrode sealant 70, and the opening 10K2 is sealed via the negative electrode sealant 80.
　以上の工程により、外装フィルム１０の内部に電池素子２０が封入され、電池素子２０とそれぞれ電気的に接続された正極配線２００および負極配線３００が外装フィルム１０から外部に突出したラミネートフィルム型の二次電池が完成する。 Through the above steps, the battery element 20 is enclosed inside the exterior film 10, and the positive electrode wiring 200 and the negative electrode wiring 300 electrically connected to the battery element 20, respectively, are laminated film type two protruding from the exterior film 10 to the outside. The next battery is completed.
＜１－４．作用および効果＞
　上記にて説明した二次電池では、可撓性を有する外装フィルム１０の内部に電池素子２０が収納され、外装フィルム１０の内部から外部まで延在する正極配線２００（正極リード３０）が電池素子２０に対向するリード部３０Ｂを含んでいる。外装フィルム１０の内部には、正極タブ５１，５２が配置されており、正極タブ５１，５２のそれぞれの一端部が電池素子２０（正極２１）に接続されていると共にそれぞれの他端部がかしめ構造５３にてリード部３０Ｂに接続されている。 <1-4. Actions and effects>
In the secondary battery described above, the battery element 20 is housed inside the flexible exterior film 10, and the positive electrode wiring 200 (positive electrode lead 30) extending from the inside to the outside of the exterior film 10 is the battery element. The lead portion 30B facing the 20 is included. Positive electrode tabs 51 and 52 are arranged inside the exterior film 10, and one end of each of the positive electrode tabs 51 and 52 is connected to the battery element 20 (positive electrode 21) and the other end of each is crimped. It is connected to the lead portion 30B by the structure 53.
　これによれば、本実施形態に係る二次電池は、リード部３０Ｂと正極タブ５１，５２とをかしめ構造５３にて接続しているため、リード部３０Ｂと正極タブ５１，５２との接続強度をより高めることができる。したがって、二次電池は、外部負荷によって、リード部３０Ｂおよび正極タブ５１，５２を含む内部配線が破断等することを抑制することができる。 According to this, in the secondary battery according to the present embodiment, since the lead portion 30B and the positive electrode tabs 51 and 52 are connected by the caulking structure 53, the connection strength between the lead portion 30B and the positive electrode tabs 51 and 52 is strong. Can be further enhanced. Therefore, the secondary battery can prevent the internal wiring including the lead portion 30B and the positive electrode tabs 51 and 52 from being broken by an external load.
　この他、本実施形態に係る二次電池では、リード部３０Ｂおよび正極タブ５１，５２の厚みが互いに異なっていた場合でも、複雑な条件の溶接等を用いることなく、かしめ構造５３にて安定して接続を形成することが可能である。 In addition, in the secondary battery according to the present embodiment, even if the thicknesses of the lead portion 30B and the positive electrode tabs 51 and 52 are different from each other, the caulking structure 53 is stable without using welding or the like under complicated conditions. It is possible to form a connection.
　また、正極タブ５１，５２の厚みがリード部３０Ｂよりも薄く、かつかしめ構造５３がリード部３０Ｂ側から正極タブ５１，５２側に向かって突出して設けられる場合、より厚みが大きいリード部３０Ｂにて正極タブ５１，５２を固定することができる。したがって、本実施形態に係る二次電池は、リード部３０Ｂと正極タブ５１，５２との接続強度をさらに高めることができる。 Further, when the thickness of the positive electrode tabs 51 and 52 is thinner than that of the lead portion 30B and the caulking structure 53 is provided so as to project from the lead portion 30B side toward the positive electrode tabs 51 and 52 side, the lead portion 30B having a larger thickness is provided. The positive electrode tabs 51 and 52 can be fixed. Therefore, the secondary battery according to the present embodiment can further increase the connection strength between the lead portion 30B and the positive electrode tabs 51 and 52.
　また、かしめ構造５３がリード部３０Ｂおよび正極タブ５１，５２の双方を貫通する貫通孔を通ってリード部３０Ｂおよび正極タブ５１，５２を互いにかしめる場合、これらの配線をまとめて接続することができる。したがって、本実施形態に係る二次電池は、より構造を単純化することができるため、外装フィルム１０の内部の体積損失をより低減することができる。 Further, when the caulking structure 53 crimps the lead portion 30B and the positive electrode tabs 51 and 52 to each other through a through hole penetrating both the lead portion 30B and the positive electrode tabs 51 and 52, these wirings can be connected together. can. Therefore, since the structure of the secondary battery according to the present embodiment can be further simplified, the volume loss inside the exterior film 10 can be further reduced.
　また、かしめ構造５３が下面Ｍ１側から上面Ｍ２側に向かってリード部３０Ｂおよび正極タブ５１，５２を互いにかしめる場合、かしめ構造５３によるバリが外装フィルム１０側に形成されるようにすることができる。したがって、本実施形態に係る二次電池は、かしめ構造５３によるバリが電池素子２０側に形成されないため、電池素子２０で短絡が発生する可能性を低減することができる。 Further, when the caulking structure 53 crimps the lead portion 30B and the positive electrode tabs 51 and 52 from the lower surface M1 side toward the upper surface M2 side, burrs due to the caulking structure 53 may be formed on the exterior film 10 side. can. Therefore, in the secondary battery according to the present embodiment, burrs due to the caulking structure 53 are not formed on the battery element 20 side, so that the possibility of a short circuit occurring in the battery element 20 can be reduced.
　また、かしめ構造５３が多角形の貫通孔５３Ａを通ってリード部３０Ｂおよび正極タブ５１，５２を互いにかしめる場合、かしめ構造５３が突起状に盛り上がることを防止することができる。したがって、本実施形態に係る二次電池は、外装フィルム１０の内部の体積損失をより低減すると共に、短絡が発生する可能性を低減することができる。 Further, when the caulking structure 53 crimps the lead portion 30B and the positive electrode tabs 51 and 52 to each other through the polygonal through hole 53A, it is possible to prevent the caulking structure 53 from rising like a protrusion. Therefore, the secondary battery according to the present embodiment can further reduce the volume loss inside the exterior film 10 and reduce the possibility of a short circuit occurring.
　また、本実施形態に係る二次電池では、リード部３０Ｂおよび正極タブ５１，５２の形成材料が互いに異なる場合でも、かしめ構造５３によって安定して接続を形成することが可能である。 Further, in the secondary battery according to the present embodiment, even when the materials for forming the lead portion 30B and the positive electrode tabs 51 and 52 are different from each other, the caulking structure 53 can stably form a connection.
　また、リード部３０Ｂは、電池素子２０に対向するように電池素子２０の厚み方向の第１方向に延在し、正極タブ５１，５２は、第１方向に延在する第１延在部Ｅ１と、第１方向と反対の第２方向に延在する第２延在部Ｅ２とを含んで設けられてもよい。このような場合、正極タブ５１，５２は、リード部３０Ｂの下面Ｍ１に沿うように第１延在部Ｅ１を延在させ、リード部３０Ｂの上面Ｍ２に沿うように第２延在部Ｅ２を延在させることできる。これによれば、正極タブ５１，５２の第１延在部Ｅ１から第２延在部Ｅ２への変形が緩やかになるため、外的負荷が生じた際の正極タブ５１，５２の破断の可能性をより低減することができる。 Further, the lead portion 30B extends in the first direction in the thickness direction of the battery element 20 so as to face the battery element 20, and the positive electrode tabs 51 and 52 extend in the first direction. And the second extending portion E2 extending in the second direction opposite to the first direction may be included. In such a case, the positive electrode tabs 51 and 52 extend the first extending portion E1 along the lower surface M1 of the lead portion 30B, and extend the second extending portion E2 along the upper surface M2 of the lead portion 30B. It can be postponed. According to this, since the deformation of the positive electrode tabs 51 and 52 from the first extending portion E1 to the second extending portion E2 becomes gentle, the positive electrode tabs 51 and 52 can be broken when an external load is generated. The sex can be further reduced.
　また、正極絶縁テープ９０がリード部３０Ｂおよび正極タブ５１の間に配置される場合、二次電池が外的負荷を受けた際に正極絶縁テープ９０が意図した位置からずれにくくなるため、リード部３０Ｂと電池素子２０との短絡の発生をより低減することができる。 Further, when the positive electrode insulating tape 90 is arranged between the lead portion 30B and the positive electrode tab 51, the positive electrode insulating tape 90 is less likely to shift from the intended position when the secondary battery receives an external load, so that the lead portion The occurrence of a short circuit between the 30B and the battery element 20 can be further reduced.
　また、正極絶縁テープ９０がリード部３０Ｂの下面Ｍ１に加えて側面Ｍ３まで沿うように配置されている場合、正極タブ５１が破損しにくくなるため、本実施形態に係る二次電池は、外的負荷が生じた際に短絡が発生する可能性をより低減することができる。 Further, when the positive electrode insulating tape 90 is arranged along the side surface M3 in addition to the lower surface M1 of the lead portion 30B, the positive electrode tab 51 is less likely to be damaged, so that the secondary battery according to the present embodiment is external. The possibility of a short circuit occurring when a load is generated can be further reduced.
　また、正極絶縁テープ１００が接合部Ｊ１および外装フィルム１０の間に配置される場合、正極絶縁テープ１００は、かしめ構造５３を覆うことで、かしめ構造５３に起因する短絡または電池素子２０の損傷を防止することができる。したがって、本実施形態に係る二次電池は、外的負荷が生じた際に短絡が発生する可能性をより低減することができる。 Further, when the positive electrode insulating tape 100 is arranged between the joint portion J1 and the exterior film 10, the positive electrode insulating tape 100 covers the caulking structure 53 to cause a short circuit or damage to the battery element 20 due to the caulking structure 53. Can be prevented. Therefore, the secondary battery according to the present embodiment can further reduce the possibility of a short circuit occurring when an external load is generated.
　また、電池素子２０が巻回電極体である場合、正極タブ５０の数を増加させることで電池素子２０の集電抵抗を低下させることができるため、より高い効果を得ることができる。 Further, when the battery element 20 is a wound electrode body, the current collecting resistance of the battery element 20 can be reduced by increasing the number of positive electrode tabs 50, so that a higher effect can be obtained.
　また、二次電池がリチウムイオン二次電池である場合、リチウムの吸蔵および放出を利用して十分な電池容量が安定に得られるため、より高い効果を得ることができる。 Further, when the secondary battery is a lithium ion secondary battery, a higher effect can be obtained because a sufficient battery capacity can be stably obtained by utilizing the storage and release of lithium.
　上記では、正極配線２００（正極リード３０および複数の正極タブ５０）および正極絶縁テープ９０の各々の構成に基づいた作用および効果に関して説明した。本実施形態に係る二次電池では、負極配線３００（負極リード４０および複数の負極タブ６０）および負極絶縁テープ１１０の各々についても、正極配線２００および正極絶縁テープ９０の各々と同様の構成を有している。したがって、負極配線３００および負極絶縁テープ１１０の各々についても、同様の作用および効果を得ることができる。 In the above, the actions and effects based on the configurations of the positive electrode wiring 200 (positive electrode lead 30 and the plurality of positive electrode tabs 50) and the positive electrode insulating tape 90 have been described. In the secondary battery according to the present embodiment, each of the negative electrode wiring 300 (negative electrode lead 40 and the plurality of negative electrode tabs 60) and the negative electrode insulating tape 110 has the same configuration as each of the positive electrode wiring 200 and the positive electrode insulating tape 90. doing. Therefore, the same action and effect can be obtained for each of the negative electrode wiring 300 and the negative electrode insulating tape 110.
＜２．変形例＞
　次に、上記した二次電池の変形例に関して説明する。二次電池の構成は、以下で説明するように、適宜、変更可能である。ただし、以下で説明する一連の変形例のうちの任意の２種類以上は、互いに組み合わされてもよい。 <2. Modification example>
Next, a modification of the above-mentioned secondary battery will be described. The configuration of the secondary battery can be changed as appropriate as described below. However, any two or more of the series of modifications described below may be combined with each other.
［変形例１］
　二次電池は、正極リード３０（リード部３０Ｂ）と接合部Ｊ１との接続様式が異なっていてもよい。図８は、変形例に係る二次電池の断面構成を示す断面図である。 [Modification 1]
The secondary battery may have a different connection mode between the positive electrode lead 30 (lead portion 30B) and the joint portion J1. FIG. 8 is a cross-sectional view showing a cross-sectional configuration of the secondary battery according to the modified example.
　図８に示すように、正極タブ５１は、下面Ｍ１だけに沿いながら折り畳まれるように屈曲されていてもよい。このとき、接合部Ｊ１は、リード部３０Ｂの下面Ｍ１に設けられる。このような場合であっても、正極タブ５１，５２は、かしめ構造５３によって正極リード３０と接続することが可能である。 As shown in FIG. 8, the positive electrode tab 51 may be bent so as to be folded along only the lower surface M1. At this time, the joint portion J1 is provided on the lower surface M1 of the lead portion 30B. Even in such a case, the positive electrode tabs 51 and 52 can be connected to the positive electrode lead 30 by the caulking structure 53.
　ここで正極リード３０に関して説明したことは、図５に示した負極リード４０に関しても同様である。すなわち、負極タブ６１は、下面Ｎ１だけに沿いながら折り畳まれるように屈曲されていてもよい。 What has been described about the positive electrode lead 30 here is the same for the negative electrode lead 40 shown in FIG. That is, the negative electrode tab 61 may be bent so as to be folded along only the lower surface N1.
［変形例２］
　図４および図５において、二次電池は、正極絶縁テープ９０および負極絶縁テープ１１０の双方を備えている。しかしながら、二次電池は、正極絶縁テープ９０および負極絶縁テープ１１０のうちのいずれか一方だけを備えていてもよい。この場合においても、二次電池は、正極絶縁テープ９０および負極絶縁テープ１１０の双方が設けられていない場合と比較して短絡の発生を抑制することができる。 [Modification 2]
In FIGS. 4 and 5, the secondary battery includes both the positive electrode insulating tape 90 and the negative electrode insulating tape 110. However, the secondary battery may include only one of the positive electrode insulating tape 90 and the negative electrode insulating tape 110. Even in this case, the secondary battery can suppress the occurrence of a short circuit as compared with the case where both the positive electrode insulating tape 90 and the negative electrode insulating tape 110 are not provided.
　ただし、短絡の発生を十分に防止し、二次電池の充放電動作をより安定して行うためには、二次電池は、正極絶縁テープ９０および負極絶縁テープ１１０の双方を備えていることが好ましい。 However, in order to sufficiently prevent the occurrence of a short circuit and to perform the charging / discharging operation of the secondary battery more stably, the secondary battery must include both the positive electrode insulating tape 90 and the negative electrode insulating tape 110. preferable.
［変形例３］
　図４において、正極絶縁テープ９０は、下面Ｍ１に沿いながら、リード部３０Ｂと正極タブ５１との間から、リード部３０Ｂと電池素子２０との間まで配置されている。しかしながら、正極絶縁テープ９０の設置範囲は、下面Ｍ１に沿うように配置されていれば、特に限定されない。この場合においても、リード部３０Ｂが正極絶縁テープ９０を介して周囲から絶縁されるため、同様の効果を得ることができる。ただし、リード部３０Ｂをより広範囲にて周囲から十分に絶縁するためには、正極絶縁テープ９０の設置範囲はできるだけ広いことが好ましい。 [Modification 3]
In FIG. 4, the positive electrode insulating tape 90 is arranged along the lower surface M1 from between the lead portion 30B and the positive electrode tab 51 to between the lead portion 30B and the battery element 20. However, the installation range of the positive electrode insulating tape 90 is not particularly limited as long as it is arranged along the lower surface M1. Even in this case, since the lead portion 30B is insulated from the surroundings via the positive electrode insulating tape 90, the same effect can be obtained. However, in order to sufficiently insulate the lead portion 30B from the surroundings in a wider range, it is preferable that the installation range of the positive electrode insulating tape 90 is as wide as possible.
　ここで、正極絶縁テープ９０に関して説明したことは、図５に示した負極絶縁テープ１１０に関しても同様である。すなわち、負極絶縁テープ１１０の設置範囲は、下面Ｎ１に沿うように配置されていれば、特に限定されない。 Here, what has been described about the positive electrode insulating tape 90 is the same for the negative electrode insulating tape 110 shown in FIG. That is, the installation range of the negative electrode insulating tape 110 is not particularly limited as long as it is arranged along the lower surface N1.
［変形例４］
　図４では、正極絶縁テープ９０は、リード部３０Ｂおよび正極タブ５１の双方に接着されている。しかしながら、正極絶縁テープ９０は、リード部３０Ｂおよび正極タブ５１のうちのいずれか一方だけに接着されていてもよい。この場合においても、正極絶縁テープ９０がリード部３０Ｂまたは正極タブ５１に固定されるため、同様の効果を得ることができる。ただし、正極絶縁テープ９０を十分に固定するためには、正極絶縁テープ９０は、リード部３０Ｂおよび正極タブ５１の双方に接着されていることが好ましい。 [Modification example 4]
In FIG. 4, the positive electrode insulating tape 90 is adhered to both the lead portion 30B and the positive electrode tab 51. However, the positive electrode insulating tape 90 may be adhered to only one of the lead portion 30B and the positive electrode tab 51. Even in this case, since the positive electrode insulating tape 90 is fixed to the lead portion 30B or the positive electrode tab 51, the same effect can be obtained. However, in order to sufficiently fix the positive electrode insulating tape 90, it is preferable that the positive electrode insulating tape 90 is adhered to both the lead portion 30B and the positive electrode tab 51.
　ここで、正極絶縁テープ９０に関して説明したことは、図５に示した負極絶縁テープ１１０に関しても同様である。すなわち、負極絶縁テープ１１０は、リード部４０Ｂおよび負極タブ６１のうちのいずれか一方だけに接着されていてもよい。 Here, what has been described about the positive electrode insulating tape 90 is the same for the negative electrode insulating tape 110 shown in FIG. That is, the negative electrode insulating tape 110 may be adhered to only one of the lead portion 40B and the negative electrode tab 61.
［変形例５］
　図４では、二次電池は、正極絶縁テープ１００および負極絶縁テープ１２０の双方を備えている。しかしながら、二次電池は、正極絶縁テープ１００および負極絶縁テープ１２０のうちのいずれか一方だけを備えていてもよい。この場合においても、二次電池は、正極絶縁テープ１００および負極絶縁テープ１２０の双方が設けられていない場合と比較して短絡の発生を抑制することができる。 [Modification 5]
In FIG. 4, the secondary battery includes both the positive electrode insulating tape 100 and the negative electrode insulating tape 120. However, the secondary battery may include only one of the positive electrode insulating tape 100 and the negative electrode insulating tape 120. Even in this case, the secondary battery can suppress the occurrence of a short circuit as compared with the case where both the positive electrode insulating tape 100 and the negative electrode insulating tape 120 are not provided.
　ただし、短絡の発生を十分に防止し、二次電池の充放電動作をより安定して行うためには、二次電池は、正極絶縁テープ１００および負極絶縁テープ１２０の双方を備えていることが好ましい。 However, in order to sufficiently prevent the occurrence of a short circuit and to perform the charging / discharging operation of the secondary battery more stably, the secondary battery must include both the positive electrode insulating tape 100 and the negative electrode insulating tape 120. preferable.
　なお、二次電池は、正極絶縁テープ１００および負極絶縁テープ１２０の双方を備えていなくてもよい。この場合においても、二次電池は、正極絶縁テープ９０および負極絶縁テープ１１０のうちの一方または双方を備えていれば、正極リード３０または負極リード４０と電池素子２０との短絡の発生を防止することができる。 The secondary battery does not have to include both the positive electrode insulating tape 100 and the negative electrode insulating tape 120. Even in this case, if the secondary battery includes one or both of the positive electrode insulating tape 90 and the negative electrode insulating tape 110, a short circuit between the positive electrode lead 30 or the negative electrode lead 40 and the battery element 20 can be prevented. be able to.
　ただし、短絡の発生を十分に防止するためには、二次電池は、正極絶縁テープ１００および負極絶縁テープ１２０のうちの一方または双方を備えていることが好ましい。 However, in order to sufficiently prevent the occurrence of a short circuit, it is preferable that the secondary battery includes one or both of the positive electrode insulating tape 100 and the negative electrode insulating tape 120.
［変形例６］
　図４では、正極絶縁テープ１００が接合部Ｊ１および外装フィルム１０の双方に接着されている。しかしながら、正極絶縁テープ１００は、接合部Ｊ１および外装フィルム１０のうちのいずれか一方だけに接着されていてもよい。この場合においても、正極絶縁テープ１００は、接合部Ｊ１または外装フィルム１０に固定されるため、同様の効果を得ることができる。ただし、正極絶縁テープ１００を十分に固定するためには、正極絶縁テープ１００は接合部Ｊ１および外装フィルム１０の双方に接着されていることが好ましい。 [Modification 6]
In FIG. 4, the positive electrode insulating tape 100 is adhered to both the joint portion J1 and the exterior film 10. However, the positive electrode insulating tape 100 may be adhered to only one of the joint portion J1 and the exterior film 10. Even in this case, since the positive electrode insulating tape 100 is fixed to the joint portion J1 or the exterior film 10, the same effect can be obtained. However, in order to sufficiently fix the positive electrode insulating tape 100, it is preferable that the positive electrode insulating tape 100 is adhered to both the joint portion J1 and the exterior film 10.
　ここで、正極絶縁テープ１００に関して説明したことは、図５に示した負極絶縁テープ１２０に関しても同様である。すなわち、負極絶縁テープ１２０は、接合部Ｊ２および外装フィルム１０のうちのいずれか一方だけに接着されていてもよい。 Here, what has been described about the positive electrode insulating tape 100 is the same for the negative electrode insulating tape 120 shown in FIG. That is, the negative electrode insulating tape 120 may be adhered to only one of the joint portion J2 and the exterior film 10.
［変形例７］
　図４では、正極タブ５０の数が２本（正極タブ５１，５２）であると共に、図５では、負極タブ６０の数が２本（負極タブ６１，６２）である。しかしながら、正極タブ５０の数は、複数であれば特に限定されないため、３本以上でもよい。また、負極タブ６０の数は、複数であれば特に限定されないため、３本以上でもよい。これらの場合においても、同様の効果を得ることができる。 [Modification 7]
In FIG. 4, the number of positive electrode tabs 50 is two (positive electrode tabs 51 and 52), and in FIG. 5, the number of negative electrode tabs 60 is two (negative electrode tabs 61 and 62). However, the number of positive electrode tabs 50 is not particularly limited as long as it is plural, and may be three or more. Further, the number of negative electrode tabs 60 is not particularly limited as long as it is plural, and may be three or more. In these cases, the same effect can be obtained.
　この場合には、正極タブ５０の数が多くなるほど二次電池（電池素子２０）の電気抵抗（集電抵抗）が低下するため、二次電池の電池特性をより向上させることができる。二次電池（電池素子２０）の電気抵抗が低下することに起因した効果は、負極タブ６０の数が多くなる場合に関しても同様に得ることができる。 In this case, as the number of positive electrode tabs 50 increases, the electrical resistance (collection resistance) of the secondary battery (battery element 20) decreases, so that the battery characteristics of the secondary battery can be further improved. The effect caused by the decrease in the electric resistance of the secondary battery (battery element 20) can be similarly obtained even when the number of negative electrode tabs 60 is increased.
［変形例８］
　上記実施形態では、セパレータ２３は、多孔質膜であるとして説明した。しかしながら、セパレータ２３は、高分子化合物層を含む積層膜であってもよい。 [Modification 8]
In the above embodiment, the separator 23 has been described as being a porous membrane. However, the separator 23 may be a laminated film containing a polymer compound layer.
　具体的には、セパレータ２３は、上記した多孔質膜である基材層と、基材層の片面または両面に設けられた高分子化合物層とを含んでいる。高分子化合物層は、物理的強度に優れていると共に、電気化学的に安定なポリフッ化ビニリデンなどの高分子化合物を含んでいる。これによれば、セパレータ２３は、正極２１および負極２２のそれぞれに対する密着性を向上させることができるため、電池素子２０の内部での位置ずれを抑制することができる。したがって、二次電池は、電解液の分解反応などが発生した場合でも、膨れの発生を抑制することができる。 Specifically, the separator 23 includes the above-mentioned porous film base material layer and the polymer compound layer provided on one side or both sides of the base material layer. The polymer compound layer contains a polymer compound such as polyvinylidene fluoride, which has excellent physical strength and is electrochemically stable. According to this, since the separator 23 can improve the adhesion to each of the positive electrode 21 and the negative electrode 22, it is possible to suppress the misalignment inside the battery element 20. Therefore, the secondary battery can suppress the occurrence of swelling even when the decomposition reaction of the electrolytic solution occurs.
　なお、基材層および高分子化合物層のうちの一方または双方は、複数の粒子を含んでいてもよい。複数の粒子の種類は、無機粒子および樹脂粒子などの粒子のうちのいずれか１種類または２種類以上であってもよい。これによれば、二次電池は、発熱時に複数の粒子にて放熱することができるため、耐熱性および安全性を向上させることができる。無機粒子は、特に限定されないが、酸化アルミニウム（アルミナ）、窒化アルミニウム、ベーマイト、酸化ケイ素（シリカ）、酸化チタン（チタニア）、酸化マグネシウム（マグネシア）および酸化ジルコニウム（ジルコニア）などの粒子である。 Note that one or both of the base material layer and the polymer compound layer may contain a plurality of particles. The plurality of types of particles may be any one type or two or more types of particles such as inorganic particles and resin particles. According to this, since the secondary battery can dissipate heat with a plurality of particles when it generates heat, heat resistance and safety can be improved. The inorganic particles are not particularly limited, but are particles such as aluminum oxide (alumina), aluminum nitride, boehmite, silicon oxide (silica), titanium oxide (titania), magnesium oxide (magnesia) and zirconium oxide (zirconia).
　なお、高分子化合物層を含む積層膜のセパレータ２３は、高分子化合物および有機溶剤などを含む前駆溶液を調製したのち、基材層の片面または両面に前駆溶液を塗布することで作製することができる。 The separator 23 of the laminated film containing the polymer compound layer can be prepared by preparing a precursor solution containing the polymer compound, an organic solvent, etc., and then applying the precursor solution to one or both sides of the base material layer. can.
　このようなセパレータ２３を用いた場合でも、正極２１と負極２２との間においてリチウムが移動可能になるため、二次電池は、同様の効果を得ることができる。 Even when such a separator 23 is used, lithium can move between the positive electrode 21 and the negative electrode 22, so that the secondary battery can obtain the same effect.
［変形例９］
　上記実施形態では、電解質は、液状の電解液であるとして説明した。しかしながら、電解質は、ゲル状の電解質層であってもよい。 [Modification 9]
In the above embodiment, the electrolyte has been described as being a liquid electrolyte. However, the electrolyte may be a gel-like electrolyte layer.
　ゲル状の電解質層を用いた電池素子２０では、セパレータ２３および電解質層を介して正極２１および負極２２が互いに積層されたのち、正極２１、負極２２、セパレータ２３および電解質層が巻回されている。これによれば、電解質層は、正極２１とセパレータ２３との間に介在していると共に、負極２２とセパレータ２３との間に介在している。 In the battery element 20 using the gel-like electrolyte layer, the positive electrode 21 and the negative electrode 22 are laminated with each other via the separator 23 and the electrolyte layer, and then the positive electrode 21, the negative electrode 22, the separator 23 and the electrolyte layer are wound around. .. According to this, the electrolyte layer is interposed between the positive electrode 21 and the separator 23, and is interposed between the negative electrode 22 and the separator 23.
　電解質層は、電解液と共に高分子化合物を含んでおり、高分子化合物により電解液を保持している。電解液の構成は、上記した通りである。高分子化合物は、ポリフッ化ビニリデンなどを含んでいる。電解質層は、電解液、高分子化合物および有機溶剤などを含む前駆溶液を調製したのち、正極２１および負極２２のそれぞれの片面または両面に前駆溶液を塗布することで形成することができる。 The electrolyte layer contains a polymer compound together with the electrolyte solution, and the electrolyte solution is held by the polymer compound. The composition of the electrolytic solution is as described above. The polymer compound contains polyvinylidene fluoride and the like. The electrolyte layer can be formed by preparing a precursor solution containing an electrolytic solution, a polymer compound, an organic solvent, or the like, and then applying the precursor solution to one or both sides of each of the positive electrode 21 and the negative electrode 22.
　このような電解質層を用いた場合でも、正極２１と負極２２との間において電解質層を介してリチウムが移動可能になるため、二次電池は、同様の効果を得ることができる。 Even when such an electrolyte layer is used, lithium can move between the positive electrode 21 and the negative electrode 22 via the electrolyte layer, so that the secondary battery can obtain the same effect.
［変形例１０］
　図４では、リード部３０Ｂの延在方向と交差する方向にリード部３０Ａが延在しているため、正極リード３０が屈曲している。しかしながら、ここでは具体的に図示しないが、リード部３０Ｂの延在方向と同様の方向にリード部３０Ａが延在しており、正極リード３０が屈曲せずに開口部１０Ｋ１を介して外装フィルム１０から外部に突出されていてもよい。この場合においても、正極タブ５１，５２をリード部３０Ｂに接続することができるため、二次電池は、同様の効果を得ることができる。 [Modification 10]
In FIG. 4, since the lead portion 30A extends in a direction intersecting the extending direction of the lead portion 30B, the positive electrode lead 30 is bent. However, although not specifically shown here, the lead portion 30A extends in the same direction as the extending direction of the lead portion 30B, and the positive electrode lead 30 does not bend and the exterior film 10 is passed through the opening 10K1. It may be projected to the outside from. Even in this case, since the positive electrode tabs 51 and 52 can be connected to the lead portion 30B, the secondary battery can obtain the same effect.
　ただし、電子機器に対して二次電池を接続しやすくするためには、リード部３０Ｂの延在方向と交差する方向にリード部３０Ａが延在していることが好ましい。 However, in order to facilitate the connection of the secondary battery to the electronic device, it is preferable that the lead portion 30A extends in a direction intersecting the extending direction of the lead portion 30B.
　ここで正極リード３０に関して説明したことは、図５で示した負極リード４０に関しても同様である。すなわち、負極リード４０は屈曲していなくてもよい。この場合においても、負極タブ６１，６２をリード部４０Ｂに接続することができるため、二次電池は、同様の効果を得ることができる。 What has been described about the positive electrode lead 30 here is the same for the negative electrode lead 40 shown in FIG. That is, the negative electrode lead 40 does not have to be bent. Even in this case, since the negative electrode tabs 61 and 62 can be connected to the lead portion 40B, the secondary battery can obtain the same effect.
［変形例１１］
　図４では、正極タブ５０と正極集電体２１Ａとは互いに別体であるが、正極タブ５０と正極集電体２１Ａとは互いに一体に設けられてもよい。具体的には、金属箔の打ち抜き加工を用いた正極集電体２１Ａの形成工程において、正極タブ５０と正極集電体２１Ａとが互いに一体化された形状となるように金属箔を打ち抜くことにより、正極タブ５０と一体化された正極集電体２１Ａを形成可能である。この場合においても、正極タブ５０をリード部３０Ｂに接続することができるため、二次電池は、同様の効果を得ることができる。 [Modification 11]
In FIG. 4, the positive electrode tab 50 and the positive electrode current collector 21A are separate from each other, but the positive electrode tab 50 and the positive electrode current collector 21A may be provided integrally with each other. Specifically, in the step of forming the positive electrode current collector 21A using the punching process of the metal foil, the metal foil is punched so that the positive electrode tab 50 and the positive electrode current collector 21A have a shape integrated with each other. , The positive electrode current collector 21A integrated with the positive electrode tab 50 can be formed. Even in this case, since the positive electrode tab 50 can be connected to the lead portion 30B, the secondary battery can obtain the same effect.
　ここで正極タブ５０および正極集電体２１Ａに関して説明したことは、図５に示した負極タブ６０および負極集電体２２Ａに関しても同様である。すなわち、負極タブ６０と負極集電体２２Ａとは互いに一体に設けられてもよい。この場合においても、負極タブ６０をリード部４０Ｂに接続することができるため、二次電池は、同様の効果を得ることができる。 What has been described here with respect to the positive electrode tab 50 and the positive electrode current collector 21A is the same for the negative electrode tab 60 and the negative electrode current collector 22A shown in FIG. That is, the negative electrode tab 60 and the negative electrode current collector 22A may be provided integrally with each other. Even in this case, since the negative electrode tab 60 can be connected to the lead portion 40B, the secondary battery can obtain the same effect.
＜３．二次電池の用途＞
　次に、上記した二次電池の用途（適用例）に関して説明する。 <3. Applications for secondary batteries>
Next, the application (application example) of the above-mentioned secondary battery will be described.
　二次電池の用途は、主に、駆動用の電源または電力蓄積用の電力貯蔵源などとして二次電池を利用する機械、機器、器具、装置およびシステム（複数の機器などの集合体）などであれば、特に限定されない。電源として用いられる二次電池は、主電源でもよいし、補助電源でもよい。主電源とは、他の電源の有無に関係なく、優先的に用いられる電源である。補助電源は、主電源の代わりに用いられる電源または必要に応じて主電源から切り替えられる電源である。二次電池を補助電源として用いる場合、主電源の種類は二次電池に限定されない。 Secondary batteries are mainly used in machines, devices, appliances, devices and systems (aggregates of multiple devices, etc.) that use secondary batteries as a power source for driving or a power storage source for storing power. If there is, there is no particular limitation. The secondary battery used as a power source may be a main power source or an auxiliary power source. The main power source is a power source that is preferentially used regardless of the presence or absence of another power source. Auxiliary power supplies are power supplies that are used in place of the main power supply or that can be switched from the main power supply as needed. When a secondary battery is used as an auxiliary power source, the type of main power source is not limited to the secondary battery.
　二次電池の用途の具体例は、ビデオカメラ、デジタルスチルカメラ、携帯電話機、ノート型パソコン、コードレス電話機、ヘッドホンステレオ、携帯用ラジオ、携帯用テレビおよび携帯用情報端末などの電子機器（携帯用電子機器を含む）である。また、二次電池の用途の具体例は、電気シェーバなどの携帯用生活器具、バックアップ電源およびメモリーカードなどの記憶用装置、電動ドリルおよび電動鋸などの電動工具、着脱可能な電源としてノート型パソコンなどに搭載される電池パック、ペースメーカおよび補聴器などの医療用電子機器、電気自動車（ハイブリッド自動車を含む）などの電動車両、ならびに非常時などに備えて電力を蓄積しておく家庭用バッテリシステムなどの電力貯蔵システムである。 Specific examples of applications for secondary batteries include electronic devices such as video cameras, digital still cameras, mobile phones, laptop computers, cordless phones, headphone stereos, portable radios, portable TVs, and portable information terminals (portable electronic devices). (Including equipment). Specific examples of applications for secondary batteries include portable household appliances such as electric shavers, storage devices such as backup power supplies and memory cards, electric tools such as electric drills and electric saws, and notebook personal computers as removable power supplies. Battery packs installed in such devices, medical electronic devices such as pacemakers and hearing aids, electric vehicles such as electric vehicles (including hybrid vehicles), and household battery systems that store power in case of an emergency. It is a power storage system.
　なお、二次電池の電池構造は、上記したラミネートフィルム型および円筒型でもよいし、それら以外の他の電池構造でもよい。また、複数の二次電池を利用することで、電池パックおよび電池モジュールなどとして用いられてもよい。 The battery structure of the secondary battery may be the above-mentioned laminated film type or cylindrical type, or may be another battery structure other than these. Further, by using a plurality of secondary batteries, it may be used as a battery pack, a battery module, or the like.
　電池パックおよび電池モジュールは、電動車両、電力貯蔵システムおよび電動工具などの比較的大型の機器などに適用されることが有効である。電池パックは、単電池を用いてもよいし、組電池を用いてもよい。電動車両は、二次電池を駆動用電源として作動（走行）する車両であり、上記したように、二次電池以外の駆動源を併せて備えた自動車（ハイブリッド自動車など）でもよい。電力貯蔵システムは、二次電池を電力貯蔵源として用いるシステムである。家庭用の電力貯蔵システムでは、電力貯蔵源である二次電池に電力が蓄積されているため、蓄積された電力を利用して家庭用の電気製品などを使用可能である。 It is effective that the battery pack and battery module are applied to relatively large equipment such as electric vehicles, power storage systems and electric tools. As the battery pack, a single battery or an assembled battery may be used. The electric vehicle is a vehicle that operates (runs) using a secondary battery as a driving power source, and may be a vehicle (hybrid vehicle or the like) that also has a drive source other than the secondary battery as described above. The power storage system is a system that uses a secondary battery as a power storage source. In a household power storage system, power is stored in a secondary battery, which is a power storage source, so that the stored power can be used to use household electrical products and the like.
　ここで、二次電池のいくつかの適用例に関して具体的に説明する。以下で説明する適用例の構成は、あくまで一例であるため、適宜、変更可能である。以下の適用例に用いられる二次電池の種類は、特に限定されないため、ラミネートフィルム型でもよいし、円筒型でもよい。 Here, some application examples of the secondary battery will be specifically described. The configuration of the application example described below is just an example, and can be changed as appropriate. The type of the secondary battery used in the following application examples is not particularly limited, and may be a laminated film type or a cylindrical type.
　図９は、単電池を用いた電池パックのブロック構成を示すブロック図である。ここで説明する電池パックは、１個の二次電池を用いた簡易型の電池パック（いわゆるソフトパック）であり、スマートフォンに代表される電子機器などに搭載される。 FIG. 9 is a block diagram showing a block configuration of a battery pack using a cell. The battery pack described here is a simple battery pack (so-called soft pack) using one secondary battery, and is mounted on an electronic device represented by a smartphone.
　図９に示すように、電池パックは、電源４１０と、回路基板４２０とを備えている。回路基板４２０は、電源４１０に接続されていると共に、正極端子２１０、負極端子３１０および温度検出端子（いわゆるＴ端子）４３０を含んでいる。 As shown in FIG. 9, the battery pack includes a power supply 410 and a circuit board 420. The circuit board 420 is connected to the power supply 410 and includes a positive electrode terminal 210, a negative electrode terminal 310, and a temperature detection terminal (so-called T terminal) 430.
　電源４１０は、１個の二次電池を含んでいる。二次電池では、正極配線２００が正極端子２１０に接続されていると共に、負極配線３００が負極端子３１０に接続されている。電源４１０は、正極端子２１０および負極端子３１０を介して外部と接続可能であるため、正極端子２１０および負極端子３１０を介して充放電可能である。回路基板４２０は、制御部４４０と、スイッチ４５０と、ＰＴＣ素子４６０と、温度検出部４７０とを含んでいる。ただし、ＰＴＣ素子４６０は省略されてもよい。 The power supply 410 includes one secondary battery. In the secondary battery, the positive electrode wiring 200 is connected to the positive electrode terminal 210, and the negative electrode wiring 300 is connected to the negative electrode terminal 310. Since the power supply 410 can be connected to the outside via the positive electrode terminal 210 and the negative electrode terminal 310, it can be charged and discharged via the positive electrode terminal 210 and the negative electrode terminal 310. The circuit board 420 includes a control unit 440, a switch 450, a PTC element 460, and a temperature detection unit 470. However, the PTC element 460 may be omitted.
　制御部４４０は、中央演算処理装置（CPU：Central Processing Unit）およびメモリなどを含んでおり、電池パック全体の動作を制御する。制御部４４０は、必要に応じて電源４１０の使用状態の検出および制御を行う。 The control unit 440 includes a central processing unit (CPU: Central Processing Unit), a memory, and the like, and controls the operation of the entire battery pack. The control unit 440 detects and controls the usage state of the power supply 410 as needed.
　制御部４４０は、電源４１０（二次電池）の電池電圧が過充電検出電圧または過放電検出電圧に到達すると、スイッチ４５０を切断することにより、電源４１０の電流経路に充電電流が流れないようにする。また、制御部４４０は、充電時または放電時において大電流が流れると、スイッチ４５０を切断することにより、充電電流を遮断する。過充電検出電圧および過放電検出電圧は、特に限定されない。一例を挙げると、過充電検出電圧は、４．２Ｖ±０．０５Ｖであると共に、過放電検出電圧は、２．４Ｖ±０．１Ｖである。 When the battery voltage of the power supply 410 (secondary battery) reaches the overcharge detection voltage or the overdischarge detection voltage, the control unit 440 disconnects the switch 450 so that the charging current does not flow in the current path of the power supply 410. do. Further, the control unit 440 cuts off the charging current by cutting off the switch 450 when a large current flows during charging or discharging. The overcharge detection voltage and the overdischarge detection voltage are not particularly limited. As an example, the overcharge detection voltage is 4.2V ± 0.05V, and the overdischarge detection voltage is 2.4V ± 0.1V.
　スイッチ４５０は、充電制御スイッチ、放電制御スイッチ、充電用ダイオードおよび放電用ダイオードなどを含んでおり、制御部４４０の指示に応じて電源４１０と外部機器との接続の有無を切り換える。スイッチ４５０は、金属酸化物半導体を用いた電界効果トランジスタ（MOSFET：Metal-Oxide-Semiconductor Field-Effect Transistor ）などを含んでおり、充放電電流は、スイッチ４５０のＯＮ抵抗に基づいて検出される。 The switch 450 includes a charge control switch, a discharge control switch, a charging diode, a discharging diode, and the like, and switches the connection between the power supply 410 and the external device according to the instruction of the control unit 440. The switch 450 includes a field effect transistor (MOSFET: Metal-Oxide-Semiconductor Field-Effect Transistor) using a metal oxide semiconductor, and the charge / discharge current is detected based on the ON resistance of the switch 450.
　温度検出部４７０は、サーミスタなどの温度検出素子を含んでおり、温度検出端子４３０を用いて電源４１０の温度を測定すると共に、温度の測定結果を制御部４４０に出力する。温度検出部４７０により測定される温度の測定結果は、異常発熱時に制御部４４０が充放電制御を行う場合および残容量の算出時に制御部４４０が補正処理を行う場合などに用いられる。 The temperature detection unit 470 includes a temperature detection element such as a thermistor, measures the temperature of the power supply 410 using the temperature detection terminal 430, and outputs the temperature measurement result to the control unit 440. The temperature measurement result measured by the temperature detection unit 470 is used when the control unit 440 performs charge / discharge control when abnormal heat generation occurs, or when the control unit 440 performs correction processing when calculating the remaining capacity.
　以上、一実施形態および実施例を挙げながら本技術に関して説明したが、その技術の構成は、一実施形態および実施例において説明された構成に限定されないため、種々に変形可能である。 Although the present technology has been described above with reference to one embodiment and examples, the configuration of the technology is not limited to the configurations described in one embodiment and examples, and thus can be variously modified.
　具体的には、電子素子の素子構造が巻回型（巻回電極体）である場合に関して説明したが、その電池素子の素子構造は、特に限定されないため、電極（正極および負極）が積層された積層型（積層電極体）および電極（正極および負極）がジグザグに折り畳まれた九十九折り型などの他の素子構造でもよい。 Specifically, the case where the element structure of the electronic element is a wound type (wound electrode body) has been described, but since the element structure of the battery element is not particularly limited, electrodes (positive electrode and negative electrode) are laminated. Other element structures such as a laminated type (laminated electrode body) and a ninety-nine-fold type in which the electrodes (positive electrode and negative electrode) are folded in a zigzag manner may be used.
　また、電極反応物質がリチウムである場合に関して説明したが、その電極反応物質は、特に限定されない。具体的には、電極反応物質は、上記したように、ナトリウムおよびカリウムなどの他のアルカリ金属でもよいし、ベリリウム、マグネシウムおよびカルシウムなどのアルカリ土類金属でもよい。このほか、電極反応物質は、アルミニウムなどの他の軽金属でもよい。 Although the case where the electrode reactant is lithium has been described, the electrode reactant is not particularly limited. Specifically, as described above, the electrode reactant may be another alkali metal such as sodium and potassium, or an alkaline earth metal such as beryllium, magnesium and calcium. In addition, the electrode reactant may be another light metal such as aluminum.
　本明細書中に記載された効果は、あくまで例示であるため、本技術の効果は、本明細書中に記載された効果に限定されない。よって、本技術に関して、他の効果が得られてもよい。 Since the effects described in the present specification are merely examples, the effects of the present technology are not limited to the effects described in the present specification. Therefore, other effects may be obtained with respect to the present technology.

Claims (13)

  1. 　可撓性を有する外装部材と、
    　前記外装部材の内部に収納され、扁平形状を有する電池素子と、
    　前記外装部材の内部から外部まで延在する第１配線部材と、
    　前記外装部材の内部に配置された複数の第２配線部材と
    　を備え、
    　前記第１配線部材は、前記電池素子に対向する対向部を含み、前記対向部は、前記外装部材の内部にて前記扁平形状の厚み方向に延在し、
    　前記複数の第２配線部材のそれぞれの一端部は、前記電池素子に接続され、前記複数の第２配線部材のそれぞれの他端部は、前記第１配線部材の前記対向部に設けられた少なくとも１つのかしめ構造にて接続されている、
    　二次電池。     Flexible exterior members and
    A battery element housed inside the exterior member and having a flat shape,
    A first wiring member extending from the inside to the outside of the exterior member,
    A plurality of second wiring members arranged inside the exterior member are provided.
    The first wiring member includes a facing portion facing the battery element, and the facing portion extends inside the exterior member in the thickness direction of the flat shape.
    One end of each of the plurality of second wiring members is connected to the battery element, and the other end of each of the plurality of second wiring members is provided at least on the opposite portion of the first wiring member. Connected by one caulking structure,
    Secondary battery.
  2. 　前記第１配線部材および前記複数の第２配線部材は、厚みが互いに異なる、
    　請求項１に記載の二次電池。     The first wiring member and the plurality of second wiring members have different thicknesses.
    The secondary battery according to claim 1.
  3. 　前記複数の第２配線部材は、前記第１配線部材よりも厚みが薄く、
    　前記かしめ構造は、前記第１配線部材側から前記複数の第２配線部材側に向かって突出して設けられる、
    　請求項１または２記載の二次電池。     The plurality of second wiring members are thinner than the first wiring member.
    The caulking structure is provided so as to project from the first wiring member side toward the plurality of second wiring member sides.
    The secondary battery according to claim 1 or 2.
  4. 　前記かしめ構造は、前記第１配線部材および前記複数の第２配線部材の双方を貫通する貫通孔を通って、前記第１配線部材および前記複数の第２配線部材を互いにかしめた構造を含む、
    　請求項１ないし請求項３のいずれか１項に記載の二次電池。     The caulking structure includes a structure in which the first wiring member and the plurality of second wiring members are crimped to each other through through holes penetrating both the first wiring member and the plurality of second wiring members.
    The secondary battery according to any one of claims 1 to 3.
  5. 　前記かしめ構造は、前記電池素子に対向する面側から反対の面側に向かって前記第１配線部材および前記複数の第２配線部材を互いにかしめた構造を含む、
    　請求項４に記載の二次電池。     The caulking structure includes a structure in which the first wiring member and the plurality of second wiring members are crimped to each other from a surface side facing the battery element to an opposite surface side.
    The secondary battery according to claim 4.
  6. 　前記貫通孔の形状は、多角形である、
    　請求項４または請求項５に記載の二次電池。     The shape of the through hole is polygonal.
    The secondary battery according to claim 4 or 5.
  7. 　前記第１配線部材および前記複数の第２配線部材は、互いに異なる形成材料を含む、
    　請求項１ないし請求項６のいずれか１項に記載の二次電池。     The first wiring member and the plurality of second wiring members contain different forming materials.
    The secondary battery according to any one of claims 1 to 6.
  8. 　前記対向部は、前記電池素子に対向する対向面と、前記対向面と反対側の反対面とを有し、
    　前記複数の第２配線部材の各々の他端部は、前記対向部が延在する第１方向に延在する第１延在部、および前記第１方向と反対の第２方向に延在する第２延在部を含み、
    　前記第１延在部は、前記対向面に沿うように延在し、
    　前記第２延在部は、前記反対面に沿うように延在する、
    　請求項１ないし請求項７のいずれか１項に記載の二次電池。     The facing portion has a facing surface facing the battery element and a facing surface opposite to the facing surface.
    The other end of each of the plurality of second wiring members extends in a first extending portion extending in the first direction in which the facing portion extends, and in a second direction opposite to the first direction. Including the second extension
    The first extending portion extends along the facing surface and extends.
    The second extending portion extends along the opposite surface.
    The secondary battery according to any one of claims 1 to 7.
  9. 　さらに、
    　前記対向面と前記第１延在部との間に配置され、前記対向部および前記第１延在部の少なくとも一方と接着されている第１絶縁部材を備えた、
    　請求項８に記載の二次電池。     Moreover,
    A first insulating member arranged between the facing surface and the first extending portion and adhered to at least one of the facing portion and the first extending portion is provided.
    The secondary battery according to claim 8.
  10. 　前記第１絶縁部材は、前記対向面と、前記対向面および前記反対面を連結する側面とに沿うように配置されている、
    　請求項９に記載の二次電池。     The first insulating member is arranged along the facing surface and the side surface connecting the facing surface and the opposite surface.
    The secondary battery according to claim 9.
  11. 　さらに、
    　前記外装部材と前記第２延在部との間に配置され、前記外装部材および前記第２延在部の少なくとも一方と接着されている第２絶縁性部材を備えた、
    　請求項８ないし請求項１０のいずれか１項に記載の二次電池。     Moreover,
    A second insulating member arranged between the exterior member and the second extending portion and adhered to at least one of the exterior member and the second extending portion.
    The secondary battery according to any one of claims 8 to 10.
  12. 　前記電池素子は、正極、負極およびセパレータを含み、
    　前記正極および負極は、前記セパレータを介して巻回されている、
    　請求項１ないし請求項１１のいずれか１項に記載の二次電池。     The battery element includes a positive electrode, a negative electrode and a separator.
    The positive electrode and the negative electrode are wound around the separator.
    The secondary battery according to any one of claims 1 to 11.
  13. 　リチウムイオン二次電池である、
    　請求項１ないし請求項１２のいずれか１項に記載の二次電池。     Lithium-ion secondary battery,
    The secondary battery according to any one of claims 1 to 12.
PCT/JP2020/042693 2020-03-25 2020-11-17 Secondary battery WO2021192406A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-054779 2020-03-25
JP2020054779 2020-03-25

Publications (1)

Publication Number Publication Date
WO2021192406A1 true WO2021192406A1 (en) 2021-09-30

Family

ID=77890059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/042693 WO2021192406A1 (en) 2020-03-25 2020-11-17 Secondary battery

Country Status (1)

Country Link
WO (1) WO2021192406A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6369351U (en) * 1986-10-23 1988-05-10
JP2002298825A (en) * 2001-03-29 2002-10-11 Tdk Corp Method of producing electrochemical device and the electrochemical device
JP2004022534A (en) * 2002-06-12 2004-01-22 Kokam Engineering Co Ltd Electrode tab treating method of crude cell for lithium secondary battery, crude cell by it, and lithium secondary battery adopting this
JP2009187768A (en) * 2008-02-06 2009-08-20 Sony Corp Nonaqueous electrolyte battery and its manufacturing method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6369351U (en) * 1986-10-23 1988-05-10
JP2002298825A (en) * 2001-03-29 2002-10-11 Tdk Corp Method of producing electrochemical device and the electrochemical device
JP2004022534A (en) * 2002-06-12 2004-01-22 Kokam Engineering Co Ltd Electrode tab treating method of crude cell for lithium secondary battery, crude cell by it, and lithium secondary battery adopting this
JP2009187768A (en) * 2008-02-06 2009-08-20 Sony Corp Nonaqueous electrolyte battery and its manufacturing method

Similar Documents

Publication Publication Date Title
JP6061162B2 (en) Pouch-type secondary battery and battery pack
JP4878800B2 (en) Lithium secondary battery
JP5558262B2 (en) battery
EP2056376A1 (en) Electrode assembly and secondary battery having the same
JP2011071109A (en) Battery
JP3505905B2 (en) Non-aqueous electrolyte battery
KR101539691B1 (en) Frame for pouch type secondary battery, battery pack having the same and manufacturing method thereof
EP4007026A1 (en) Rechargeable battery
KR20140061146A (en) Pouch type secondary battery and method for manufacturing the same
KR101669123B1 (en) Pouch type secondary battery and battery module including the same
JP2009181899A (en) Laminated battery
WO2021261029A1 (en) Secondary battery
US20230079429A1 (en) Secondary battery
US20220216564A1 (en) Secondary battery
JP5034155B2 (en) battery
JP2021516436A (en) Rechargeable battery and battery module
WO2022050046A1 (en) Secondary battery
WO2021192406A1 (en) Secondary battery
EP4075578A1 (en) Electrochemical cell and electrochemical cell module
JP2006202652A (en) Battery pack
JP6970912B2 (en) A power storage element and a power storage device including a power storage element
WO2021065339A1 (en) Secondary battery
JP2005116407A (en) Battery pack
JP7351420B2 (en) Secondary batteries and secondary battery manufacturing methods
JP2022053795A (en) Secondary battery

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20927719

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20927719

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP