WO2021261029A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2021261029A1
WO2021261029A1 PCT/JP2021/009520 JP2021009520W WO2021261029A1 WO 2021261029 A1 WO2021261029 A1 WO 2021261029A1 JP 2021009520 W JP2021009520 W JP 2021009520W WO 2021261029 A1 WO2021261029 A1 WO 2021261029A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
negative electrode
current collector
secondary battery
area
Prior art date
Application number
PCT/JP2021/009520
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English (en)
Japanese (ja)
Inventor
史人 石井
太一 木暮
明 市橋
貴皓 結城
昌泰 宮本
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.)
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN202190000572.3U priority Critical patent/CN219350311U/zh
Publication of WO2021261029A1 publication Critical patent/WO2021261029A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • H01M10/058—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the 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
    • H01M50/531—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
    • 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.
  • the shape of the tab (or lead) and the connection structure between the tab and the battery element should be optimized in order to achieve various purposes. Has been studied (see, for example, Patent Documents 1 to 3).
  • Japanese Unexamined Patent Publication No. 2010-146872 Japanese Unexamined Patent Publication No. 2013-26430 Japanese Unexamined Patent Publication No. 2013-171618
  • the present technology has been made in view of such problems, and the purpose thereof is to provide a secondary battery having high reliability of connection between a tab and a battery element and high utilization efficiency of space in an exterior member. There is something in it.
  • the secondary battery according to the embodiment of the present technology includes a flexible exterior member, a battery element having a flat shape housed inside the exterior member, and a first battery element extending from the inside to the outside of the exterior member. It includes a wiring member and a plurality of second wiring members arranged inside the exterior member and joined to the first wiring member.
  • the battery element includes an electrode current collector having a positive electrode active material layer or a negative electrode active material layer formed on at least one surface thereof.
  • the electrode current collector includes a plurality of exposed portions on which the positive electrode active material layer or the negative electrode active material layer is not formed. Each of the plurality of exposed portions is provided with a current collector joining portion for joining the electrode current collector and the plurality of second wiring members.
  • the ratio of the area of the second wiring member to the area of the exposed portion is 0.015 or more and 0.95 or less, and the ratio of the area of the collector joint to the area of the second wiring member is 0.04 or more and 0. It is 625 or less.
  • the electrode current collector included in the battery element housed inside the exterior member is joined to a plurality of second wiring members arranged inside the exterior member.
  • the plurality of second wiring members are joined to the first wiring member extending from the outside to the inside of the exterior member.
  • the ratio of the area of the second wiring member to the area of the exposed portion where the positive electrode active material layer or the negative electrode active material layer is not formed is 0.015 or more and 0.95 or less, and the ratio of the area of the second wiring member is 0.015 or more and 0.95 or less.
  • the ratio of the area of the joint portion between the electrode current collector and the second wiring member to the area is 0.04 or more and 0.625 or less. According to this, the secondary battery can improve the reliability of the connection between the electrode current collector and the second wiring member while saving the space at the joint portion between the electrode current collector and the second wiring member. be.
  • 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.
  • FIG. 1 It is a perspective view which shows the appearance structure of the secondary battery which concerns on one Embodiment of this technique. It is a perspective view which shows the appearance structure of the battery element shown in FIG. It is sectional drawing which shows the sectional structure of each of a positive electrode and a negative electrode. It is sectional drawing which shows the sectional structure of the secondary battery shown in FIG. It is sectional drawing which shows the other sectional structure of the secondary battery shown in FIG. It is a top view of the positive electrode current collector which shows the specific mode of bonding of a positive electrode lead, a positive electrode tab, and a positive electrode current collector. It is sectional drawing which shows the sectional structure of the secondary battery which concerns on the modification. It is a block diagram which shows the structure of application example (battery pack: cell) of a secondary battery.
  • the secondary battery described here is a secondary battery that obtains a battery capacity by utilizing 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 precipitating 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 utilizing 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 collectively shows the positive electrode 21 and the negative electrode 22 having a configuration common to each other.
  • 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 downward 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 using the exterior film 10 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 fused 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 foil 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 the multilayer film 10 and may be a single layer.
  • the exterior film 10 has an opening 10K1 for projecting the positive electrode wiring 200, and has 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 promotes a 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 laminated state. Therefore, the battery element 20 is a wound electrode body including the positive electrode 21 and the negative electrode 22 wound via the 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 caused by the precipitation of lithium during charging / 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 includes silicon and tin. It is a material that is used.
  • the metal-based material may be a simple substance, an alloy, a compound, or a mixture of two or more thereof.
  • 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 may contain 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 salts.
  • the positive electrode active material layer 21B is provided in 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 active material layer 21B is not provided on the positive electrode current collector 21A at the respective ends of the winding inside and the winding outside of the positive electrode 21. That is, the positive electrode current collector 21A has exposed portions 21AH at both ends, which are not provided with the positive electrode active material layer 21B. 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 positive electrode tabs 50 which will be described later, are joined to the exposed portions 21AH provided at both ends of the positive electrode current collector 21A in the extending direction.
  • the positive electrode tab 50 can be further bonded to the positive electrode lead 30 to take out electric charges from the positive electrode 21.
  • the positive electrode current collector 21A can be joined to the positive electrode tab 50 at each of the exposed portions 21AH provided at both ends to improve the current collecting efficiency.
  • the positive electrode current collector 21A is joined to each of the positive electrode tabs 51 and 52 by an exposed portion 21AH provided at a position symmetrical with respect to the center of the positive electrode current collector 21A in the extending direction. .. According to this, each of the positive electrode tabs 51 and 52 is joined at a distance substantially equal to each other from the center position in the extending direction of the positive electrode current collector 21A, so that the current can be collected from the positive electrode current collector 21A. It can be done more uniformly. Therefore, the secondary battery can allow the charge / discharge reaction at the positive electrode 21 to proceed more uniformly.
  • the negative electrode active material layer 22B is not provided on the negative electrode current collector 22A at the respective ends of the inner and outer windings of the negative electrode 22. That is, the negative electrode current collector 22A has exposed portions 22AH at both ends, which are not provided with the negative electrode active material layer 22B. 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.
  • Negative electrode tabs 60 which will be described later, are joined to the exposed portions 22AH provided at both ends of the negative electrode current collector 22A in the extending direction.
  • the negative electrode tab 60 can be further bonded to the negative electrode lead 40 to take out electric charges from the negative electrode 22.
  • the negative electrode current collector 22A can be joined to the negative electrode tab 60 at each of the exposed portions 22AH provided at both ends, thereby improving the current collecting efficiency.
  • the negative electrode current collector 22A is joined to each of the negative electrode tabs 61 and 62 by an exposed portion 22AH provided at a position symmetrical with respect to the center of the negative electrode current collector 22A in the extending direction. ..
  • each of the negative electrode tabs 61 and 62 is joined at a distance substantially equal to each other from the center position in the extending direction of the negative electrode current collector 22A, so that the current can be collected from the negative electrode current collector 22A. It can be done more uniformly. Therefore, the secondary battery can allow the charge / discharge reaction at the negative electrode 22 to proceed more uniformly.
  • the secondary battery according to the embodiment of the present technology controls the area ratio of the exposed portion 21AH of the positive electrode collector 21A, the positive electrode tab 50, and the region related to the joining between the exposed portion 21AH and the positive electrode tab 50 within an appropriate range. By doing so, the reliability of the connection between the positive electrode current collector 21A and the positive electrode tab 50 can be improved with less space loss. Further, in the secondary battery according to the embodiment of the present technology, similarly, the area ratio of the exposed portion 22AH of the negative electrode current collector 22A, the negative electrode tab 60, and the region related to the joining between the exposed portion 22AH and the negative electrode tab 60 is determined. By controlling the voltage within an appropriate range, the reliability of the connection between the negative electrode current collector 22A and the negative electrode tab 60 can be improved with less space loss. Details of the area ratios of these regions will be described later with reference to FIG.
  • 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 positive electrode wiring 200 includes a positive electrode lead 30 and a positive electrode tab 50.
  • 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 negative electrode wiring 300 includes a negative electrode lead 40 and a negative electrode tab 60.
  • 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 joined 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 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 a facing 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 joined 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.
  • 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 a facing 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 compared with the case where the number of positive electrode tabs 50 is one.
  • each of the plurality of positive electrode leads 30 is extended to the outside from the exterior film 10 in a state where each of the plurality of positive electrode leads 30 is individually or overlapped with each other, and the positive electrode leads 30 and the exterior film 10 are sealed. It is not preferable because the reliability of the stop structure tends to decrease.
  • the number of positive electrode tabs 50 is not particularly limited and can be set arbitrarily. However, in order to reduce the electric resistance of the battery element 20 and suppress the space loss in the internal space of the exterior film 10, the number of positive electrode tabs 50 is not particularly limited and can be set arbitrarily. The number is preferably 3 or less, and more preferably 2 or less.
  • One end of each of the positive electrode tabs 51 and 52 is joined to the positive electrode 21 of the battery element 20. On the other hand, the other ends of the positive electrode tabs 51 and 52 are in contact with each other.
  • each of the positive electrode tabs 51 and 52 is joined to the exposed portions 21AH provided at both ends of the positive electrode current collector 21A by using a welding method or the like. Further, the other ends of the positive electrode tabs 51 and 52 are joined to each other by a welding method or the like, and further joined to one end of the positive electrode lead 30 by a welding method or the like. The other ends of the positive electrode tabs 51 and 52 may be connected to the lead portion 30B by 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 positive electrode tabs 51 and 52 are connected to the lead portion 30B on the upper surface M2.
  • 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 bonding position between the positive electrode tab 52 and the positive electrode current collector 21A (exposed portion 21AH) is provided on the right side facing FIG. 4, but the present technology is not limited to such an example.
  • the bonding position between the positive electrode tab 52 and the positive electrode current collector 21A may be provided on the left side facing FIG. 4.
  • the bonding position between the positive electrode tab 52 and the positive electrode current collector 21A is on the right side of FIG. 4, that is, at the tip of one end of the positive electrode lead 30. It is preferable that it is provided on the near side.
  • 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 electric resistance (current collecting 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 electric 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 to have a plurality of 60s.
  • 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, it is preferably 3 or less, and preferably 2 or less. Is more preferable.
  • each of the negative electrode tabs 61 and 62 is joined to the negative electrode 22 of the battery element 20.
  • the other ends of the negative electrode tabs 61 and 62 are in contact with each other.
  • each of the negative electrode tabs 61 and 62 is joined to the exposed portions 22AH provided at both ends of the negative electrode current collector 22A by using a welding method or the like. Further, the other ends of the negative electrode tabs 61 and 62 are joined to each other by a welding method or the like, and further joined to one end of the negative electrode lead 40 by a welding method or the like. The other ends of the negative electrode tabs 61 and 62 may be connected to the lead portion 40B by 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 negative electrode tabs 61 and 62 are connected to the lead portion 40B on 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.
  • the bonding position between the negative electrode tab 62 and the negative electrode current collector 22A (exposed portion 22AH) is provided on the right side facing FIG. 5, but the present technology is not limited to such an example. Similar to the case where the positive electrode tab 52 is described, the bonding position between the negative electrode tab 62 and the negative electrode current collector 22A may be provided on the left side facing FIG. However, in order to shorten the length of the negative electrode tab 62, the bonding position between the negative electrode tab 62 and the negative electrode current collector 22A is on the right side facing FIG. 5, that is, at the tip of one end of the negative electrode lead 40. It is preferable that it is provided on the near side.
  • FIG. 6 is a plan view of the positive electrode current collector 21A that specifically shows the bonding mode of the positive electrode lead 30, the positive electrode tab 50, and the positive electrode current collector 21A.
  • each end of the positive electrode current collector 21A in the extending direction is provided with an exposed portion 21AH to which the positive electrode active material layer 21B is not provided.
  • the positive electrode tab 50 is bonded to the exposed portion 21AH of the positive electrode current collector 21A via the current collector joint portion 55, and the positive electrode lead 30 is bonded to the positive electrode tab 50 via the wiring joint portion 35. ..
  • the current collector joint 55 is a region where the positive electrode collector 21A and the positive electrode tab 50 are welded to each other
  • the wiring joint 35 is a region where the positive electrode tab 50 and the positive electrode lead 30 are welded to each other. Area.
  • the positive electrode current collector 21A and the positive electrode tab 50 are configured so that the ratio of the area of the positive electrode tab 50 to the area of the exposed portion 21AH is 0.015 or more and 0.95 or less, and the area of the positive electrode tab 50 is relative to the area of the positive electrode tab 50. They are joined to each other so that the ratio of the areas of the collector joining portions 55 is 0.04 or more and 0.625 or less. According to this, the positive electrode current collector 21A and the positive electrode tab 50 can optimize the area ratio of the current collector joint portion 55. Therefore, as shown in Examples described later, the positive electrode current collector 21A and the positive electrode tab 50 reduce the space loss in the exterior film 10 while reducing the reliability of the bonding between the positive electrode current collector 21A and the positive electrode tab 50. Can be enhanced.
  • the positive electrode current collector 21A and the positive electrode tab 50 are configured so that the ratio of the area of the positive electrode tab 50 to the area of the exposed portion 21AH is 0.017 or more and 0.30 or less, and the current collector to the area of the positive electrode tab 50. It is preferable that the joint portions 55 are joined to each other so that the area ratio is 0.04 or more and 0.5 or less. In such a case, the positive electrode current collector 21A and the positive electrode tab 50 can further optimize the area ratio of the current collector joint portion 55. Therefore, as shown in Examples described later, the positive electrode current collector 21A and the positive electrode tab 50 are reliable in joining the positive electrode current collector 21A and the positive electrode tab 50 while further reducing the space loss in the exterior film 10. The sex can be further enhanced.
  • the ratio of the area of the current collector joint portion 55 to the area of the exposed portion 21AH is 0. It is preferable that they are joined to each other so as to be 005 or more and 0.03 or less. In such a case, the positive electrode current collector 21A and the positive electrode tab 50 can further optimize the area ratio of the current collector joint portion 55. Therefore, as shown in Examples described later, the positive electrode current collector 21A and the positive electrode tab 50 are reliable in joining the positive electrode current collector 21A and the positive electrode tab 50 while further reducing the space loss in the exterior film 10. The sex can be further enhanced.
  • the positive electrode tab 50 and the positive electrode lead 30 are joined to each other so that the ratio of the area of the wiring joint 35 to the area of the collector joint 55 is 0.002 or more and 0.1 or less.
  • the positive electrode tab 50 and the positive electrode lead 30 can reduce the difficulty of the joining process by optimizing the area ratio of the wiring joining portion 35. Therefore, as shown in Examples described later, the positive electrode tab 50 and the positive electrode lead 30 can reduce the defective rate in the joining process while reducing the electrical resistance from the positive electrode current collector 21A to the positive electrode lead 30. can.
  • the ratio of the thickness of the positive electrode tab 50 to the thickness of the positive electrode lead 30 is preferably 0.1 or more and 1.0 or less.
  • the positive electrode tab 50 and the positive electrode lead 30 can reduce the difficulty of the joining process by optimizing the thickness of each other. Therefore, as shown in Examples described later, the positive electrode tab 50 and the positive electrode lead 30 can reduce the defective rate in the joining process while reducing the electrical resistance from the positive electrode current collector 21A to the positive electrode lead 30. can.
  • the bonding mode of the negative electrode current collector 22A, the negative electrode tab 60, and the negative electrode lead 40 has the same configuration as the bonding mode of the positive electrode current collector 21A, the positive electrode tab 50, and the positive electrode lead 30 described above.
  • the negative electrode current collector 22A and the negative electrode tab 60 are configured so that the ratio of the area of the negative electrode tab 60 to the area of the exposed portion 22AH is 0.015 or more and 0.95 or less, and the area of the negative electrode tab 60 is relative to the area of the negative electrode tab 60. They are joined to each other so that the ratio of the areas of the collector joints is 0.04 or more and 0.625 or less. According to this, the negative electrode current collector 22A and the negative electrode tab 60 can improve the reliability of joining the negative electrode current collector 22A and the negative electrode tab 60 while reducing the space loss in the exterior film 10.
  • the negative electrode current collector 22A and the negative electrode tab 60 are configured so that the ratio of the area of the negative electrode tab 60 to the area of the exposed portion 22AH is 0.017 or more and 0.30 or less, and the collection with respect to the area of the negative electrode tab 60. It is preferable that they are joined to each other so that the ratio of the areas of the electric body joining portions is 0.04 or more and 0.5 or less. According to this, the negative electrode current collector 22A and the negative electrode tab 60 can further reduce the space loss in the exterior film 10 and further enhance the reliability of the bonding between the negative electrode current collector 22A and the negative electrode tab 60.
  • the negative electrode current collector 22A and the negative electrode tab 60 are joined to each other so that the ratio of the area of the current collector joint to the area of the exposed portion 22AH is 0.005 or more and 0.03 or less. According to this, the negative electrode current collector 22A and the negative electrode tab 60 can further reduce the space loss in the exterior film 10 and further enhance the reliability of the bonding between the negative electrode current collector 22A and the negative electrode tab 60.
  • the negative electrode tab 60 and the negative electrode lead 40 are joined to each other so that the ratio of the area of the wiring joint to the area of the collector joint is 0.002 or more and 0.1 or less. According to this, the negative electrode tab 60 and the negative electrode lead 40 can reduce the defective rate in the joining process while reducing the electric resistance from the negative electrode current collector 22A to the negative electrode lead 40.
  • the ratio of the thickness of the negative electrode tab 60 to the thickness of the negative electrode lead 40 is preferably 0.1 or more and 1.0 or less. According to this, the negative electrode tab 60 and the negative electrode lead 40 can reduce the defective rate in the joining process while reducing the electric resistance from the negative electrode current collector 22A to the negative electrode lead 40.
  • the secondary battery is bonded at both the positive electrode 21 (positive electrode current collector 21A, positive electrode tab 50 and positive electrode lead 30) and the negative electrode 22 (negative electrode current collector 22A, negative electrode tab 60 and negative electrode lead 40). It was said that the mode of was realized. However, in the secondary battery, the above-mentioned bonding mode may be realized only by one of the positive electrode 21 and the negative electrode 22. Even in this case, the secondary battery can improve the reliability of the connection between the battery element 20 and the wiring while reducing the space loss in the exterior film 10. However, in order to improve the space efficiency inside the secondary battery and further enhance the reliability of the secondary battery, the secondary battery has the above-mentioned bonding mode realized at both the positive electrode 21 and the negative electrode 22. Is preferable.
  • 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 fusion layer, and at the opening 10K1. It is preferably heat-sealed with the exterior film 10. This is because by heat-sealing the exterior film 10 and the positive electrode sealant 70, the opening 10K1 can be sealed 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 fusion layer, and at the opening 10K2. It is preferably heat-sealed with the exterior film 10. This is because by heat-sealing the exterior film 10 and the negative electrode sealant 80, the opening 10K2 can be sealed 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 of the positive electrode tabs 50 (51, 52) (positive electrode tab 51). 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 is subjected to an external load such as vibration or impact. It becomes difficult to shift from the position. Therefore, in the secondary battery, it is easy to maintain the state in which the positive electrode insulating tape 90 is interposed between the lead portion 30B and the positive electrode tab 51, so that the positive electrode lead 30 and the battery element 20 (negative electrode 22) are separated from each other. The possibility of a short circuit 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 positive electrode tab 52 and the exterior film 10.
  • the positive electrode insulating tape 100 can prevent a short circuit caused by the positive electrode tabs 51 and 52 by electrically insulating the periphery of the positive electrode tabs 51 and 52.
  • 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 positive electrode tab 52 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 positive electrode tab 52 and the exterior film 10, it is intended even when the secondary battery is subjected to an external load such as vibration or impact. It becomes difficult to shift from the position. Therefore, the positive electrode insulating tape 100 can more reliably prevent a short circuit caused by the positive electrode tab 52.
  • the positive electrode insulating tape 100 may be adhered to each of the positive electrode tab 52 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 positive electrode tab 52 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 up to 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.
  • 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 occurring between the 20 (positive electrode 21) and the 20 (positive electrode 21) 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 negative electrode tab 62 and the exterior film 10.
  • the negative electrode insulating tape 120 can prevent a short circuit caused by the negative electrode tabs 61 and 62 by electrically insulating the periphery of the negative electrode tabs 61 and 62.
  • 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 negative electrode tab 62 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 negative electrode tab 62 and the exterior film 10, it is caused by the negative electrode tab 62 for the same reason as described with respect to the positive electrode insulating tape 100. Short circuits can be prevented more reliably.
  • the negative electrode insulating tape 120 may be adhered to each of the negative electrode tab 62 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 negative electrode tab 62 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.
  • lithium is discharged from the positive electrode 21 of the battery element 20 into the electrolytic solution, and lithium is occluded from the electrolytic solution into the negative electrode 22. Further, in the secondary battery at the time of discharge, lithium is discharged from the negative electrode 22 of the battery element 20 into the electrolytic solution, and lithium is occluded from the electrolytic solution into the positive electrode 21. Lithium is occluded and discharged into the positive electrode 21 and the negative electrode 22 in an ionic state during charging and discharging.
  • a 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 compression-molded using a roll press machine 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 provided on both sides of the positive electrode current collector 21A is produced.
  • the negative electrode active material layer 22B is 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 in the form of a metal. 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. After that, the negative electrode active material layer 22B may be compression-molded using a roll press machine or the like. As a result, the negative electrode 22 in which the negative electrode active material layers 22B are provided on both sides of the negative electrode current collector 22A is manufactured.
  • 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 (exposed portion 21AH of the positive electrode collector 21A) by using a welding method or the like, and the negative electrode tab 61, is connected to the negative electrode 22 (exposed portion 22AH of the negative electrode current collector 22A). 62 is connected.
  • the 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 joined to each other by using a welding method or the like, and one end of each of the positive electrode tabs 51 and 52 is further joined to one end of the positive electrode lead 30 (lead portion 30B). .. Further, one end of each of the negative electrode tabs 61 and 62 is joined to each other by using a welding method or the like, and one end of each of the negative electrode tabs 61 and 62 is joined to one end of the negative electrode lead 40 (lead portion 40B). 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 bonded to the battery element 20.
  • the battery element 20 to which each of the positive electrode wiring 200 and the negative electrode wiring 300 is 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 positive electrode tab 52 and the exterior film 10.
  • the negative electrode insulating tape 120 is adhered to each of the negative electrode tab 62 and the exterior film 10.
  • the exterior films 10 facing each other at the opening 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, protrude from the exterior film 10 to the outside in a laminated film type.
  • the next battery is completed.
  • the positive electrode leads 30 extending from the inside to the outside of the exterior film 10 are joined to the positive electrode tab 50 at the wiring joint portion 35 and arranged inside the exterior film 10.
  • the positive electrode tab 50 is joined to the exposed portion 21AH of the positive electrode current collector 21A at the current collector joining portion 55.
  • the ratio of the area of the positive electrode tab 50 to the area of the exposed portion 21AH is 0.015 or more and 0.95 or less, and the ratio of the area of the current collector joint 55 to the area of the positive electrode tab 50 is 0.04. It is 0.625 or less.
  • the secondary battery according to the present embodiment can optimize the bonding strength and the area related to the bonding of the positive electrode current collector 21A and the positive electrode tab 50. Therefore, the secondary battery can improve the reliability of joining the positive electrode current collector 21A and the positive electrode tab 50 while reducing the space loss in the exterior film 10.
  • the positive electrode current collector 21A and the positive electrode tab 50 are configured so that the ratio of the area of the positive electrode tab 50 to the area of the exposed portion 21AH is 0.017 or more and 0.30 or less, and the collection with respect to the area of the positive electrode tab 50. They may be joined to each other so that the ratio of the areas of the electric body joining portions 55 is 0.04 or more and 0.5 or less.
  • the secondary battery according to the present embodiment can further optimize the bonding strength and the area related to the bonding of the positive electrode current collector 21A and the positive electrode tab 50. Therefore, the secondary battery can improve the reliability of joining the positive electrode current collector 21A and the positive electrode tab 50 while reducing the space loss in the exterior film 10.
  • the positive electrode current collector 21A and the positive electrode tab 50 may be joined to each other so that the ratio of the area of the current collector joining portion 55 to the area of the exposed portion 21AH is 0.005 or more and 0.03 or less.
  • the secondary battery according to the present embodiment can further optimize the bonding strength and the area related to the bonding of the positive electrode current collector 21A and the positive electrode tab 50. Therefore, the secondary battery can improve the reliability of joining the positive electrode current collector 21A and the positive electrode tab 50 while reducing the space loss in the exterior film 10.
  • the positive electrode tab 50 and the positive electrode lead 30 may be joined to each other so that the ratio of the area of the wiring joint 35 to the area of the collector joint 55 is 0.002 or more and 0.1 or less.
  • the secondary battery according to the present embodiment can further optimize the strength and area of each junction from the positive electrode current collector 21A to the positive electrode lead 30. Therefore, the secondary battery can reduce the defect rate in the joining process while maintaining the reliability of the connection from the positive electrode current collector 21A to the positive electrode lead 30.
  • the thickness of the positive electrode tab 50 may be 0.1 or more and 1.0 or less with respect to the thickness of the positive electrode lead 30.
  • the secondary battery according to the present embodiment can reduce the difficulty of the joining process by optimizing the thickness of the positive electrode tab 50 and the positive electrode lead 30. Therefore, the secondary battery can reduce the defect rate in the joining process while maintaining the reliability of the connection from the positive electrode current collector 21A to the positive electrode lead 30.
  • the positive electrode tab 50 is provided at a position substantially equal to the center of the positive electrode current collector 21A in the extending direction. Charges can be extracted from. Therefore, the secondary battery can promote the charge / discharge reaction in the positive electrode 21 more uniformly by collecting the current from the positive electrode current collector 21A more uniformly, thereby improving the current collection efficiency of the positive electrode 21. be able to.
  • 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 sufficient battery capacity can be stably obtained by utilizing the occlusion and release of lithium, so that a higher effect can be obtained.
  • each of the negative electrode collector 22A, the negative electrode tab 60, and the negative electrode lead 40 has the same configuration as each of the positive electrode current collector 21A, the positive electrode tab 50, and the positive electrode lead 30. ing. Therefore, the same action and effect can be obtained for each of the negative electrode current collector 22A, the negative electrode tab 60, and the negative electrode lead 40.
  • the secondary battery may have different connection modes between the positive electrode lead 30 (lead portion 30B) and the positive electrode tabs 51 and 52.
  • FIG. 7 is a cross-sectional view showing a cross-sectional configuration of a secondary battery according to a modified example.
  • the positive electrode tab 51 may be bent so as to be folded along only the lower surface M1. According to this, the positive electrode tabs 51 and 52 can be joined to the positive electrode lead 30 at the lower surface M1 of the lead portion 30B.
  • 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 may 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 may be at least a range 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 may be at least a range 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 may 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.
  • the secondary battery includes one or both of the positive electrode insulating tape 90 and the negative electrode insulating tape 110, so that a short circuit occurs between the positive electrode lead 30 or the negative electrode lead 40 and the battery element 20. Can be prevented.
  • the secondary battery shall include both the positive electrode insulating tape 100 and the negative electrode insulating tape 120 in addition to both the positive electrode insulating tape 90 and the negative electrode insulating tape 110. Is preferable.
  • the positive electrode insulating tape 100 is adhered to both the positive electrode tab 52 and the exterior film 10.
  • the positive electrode insulating tape 100 may be adhered to only one of the positive electrode tab 52 and the exterior film 10. Even in this case, since the positive electrode insulating tape 100 is fixed to the positive electrode tab 52 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 positive electrode tab 52 and the exterior film 10.
  • the negative electrode insulating tape 120 may be adhered to only one of the negative electrode tab 62 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 the negative electrode tabs 60 is not particularly limited as long as it is a plurality, and may be three or more.
  • 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 including a polymer compound layer.
  • the separator 23 may include a base material layer which is the above-mentioned porous film and a polymer compound layer provided on one side or both sides of the base material layer.
  • the polymer compound layer is provided containing 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 of the separator 23 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 produced 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. ..
  • the electrolyte layer can be interposed between the positive electrode 21 and the separator 23, and can be interposed between the negative electrode 22 and the separator 23.
  • the electrolyte layer contains a polymer compound together with the electrolytic solution, and the electrolytic solution is held by the polymer compound.
  • the composition of the electrolytic solution is as described above.
  • the polymer compound may contain polyvinylidene fluoride or the like.
  • the electrolyte layer can be formed by preparing a precursor solution containing an electrolytic solution, a polymer compound, an organic solvent, and 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 joined 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 may be used as 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.
  • the auxiliary power supply is a power supply used in place of the main power supply or a power supply 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, notebook 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 living 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 computers as removable power sources. 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 electric power in case of emergencies. 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 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 electric 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. 8 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.
  • the power supply 410 can be connected to the outside via the positive electrode terminal 210 and the negative electrode terminal 310, and 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 cuts off 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 turning 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 whether or not the power supply 410 is connected to an external device according to an instruction from the control unit 440.
  • the switch 450 includes a field effect transistor (MOSFET: Metal-Oxide-Semiconductor Field-Effect Transistor) and the like, 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.
  • Examples 1 to 15, Comparative Examples 1 to 4 The laminated film type secondary battery described with reference to FIGS. 1 to 6 was produced by the following procedure.
  • a positive electrode active material, a positive electrode binder, and a positive electrode conductive agent were mixed to form a positive electrode mixture, and then the positive electrode mixture was added to an organic solvent to prepare a paste-like positive electrode mixture slurry.
  • the prepared positive electrode mixture slurry was applied to both sides of the positive electrode current collector (aluminum foil) and dried by heating to form a positive electrode active material layer.
  • a positive electrode was produced by compression molding the positive electrode active material layer using a roll press machine.
  • a negative electrode mixture was prepared by mixing a negative electrode active material, a negative electrode binder, and a negative electrode conductive agent, and then the negative electrode mixture was added to an organic solvent to prepare a paste-like negative electrode mixture slurry.
  • the prepared negative electrode mixture slurry was applied to both sides of the negative electrode current collector (copper foil) and dried by heating to form a negative electrode active material layer. Then, the negative electrode was produced by compression molding the negative electrode active material layer using a roll press machine.
  • an electrolyte salt was added to the solvent, and the electrolyte salt was dissolved in the solvent to prepare an electrolytic solution.
  • a plurality of positive electrode tabs (aluminum foil) were joined to the positive electrode current collector of the positive electrode by using a welding method.
  • a plurality of negative electrode tabs (copper foil) were bonded to the negative electrode current collector of the negative electrode.
  • the positive electrode and the negative electrode were alternately laminated via the separator, and then the laminated body of the positive electrode, the negative electrode and the separator was wound to produce a battery element.
  • the exposed portion of the positive electrode collector, the positive electrode tab, the collector joint portion between the positive electrode collector and the positive electrode tab, and the positive electrode tab were joined to the positive electrode current collector by changing the area of the wiring joint between the positive electrode lead and the positive electrode lead.
  • the areas of the exposed part of the negative electrode collector, the negative electrode tab, the collector joint between the negative electrode collector and the negative electrode tab, and the wiring joint between the negative electrode tab and the negative electrode lead are changed. Then, the negative electrode tab and the negative electrode lead were joined to the negative electrode current collector.
  • the area of each configuration of the negative electrode collector, the negative electrode tab, and the negative electrode lead is the same as the area of each configuration of the positive electrode collector, the positive electrode tab, and the positive electrode lead.
  • Table 1 shows the area of the wiring joint. Further, the ratio of the area of the positive electrode tab to the area of the exposed portion of the positive electrode collector calculated from the area of each configuration shown in Table 1, the ratio of the area of the collector joint to the area of the positive electrode tab, and the positive electrode current collector. Table 2 shows the ratio of the area of the collector joint to the area of the exposed part of.
  • the internal resistance was derived using the resistance values of the current collector joint and the wiring joint at the negative electrode as an index. Specifically, the resistance values of the current collector joint and the wiring joint are the thickness of the collector joint and the wiring joint, the area of the current collector joint and the wiring joint, and the current collector joint. And it can be calculated by using the electric resistance of the material of the wiring joint.
  • the process defect rate was derived by using the ratio of rejected products when 100 cells of the above-mentioned secondary battery were manufactured as an index.
  • the ratio of the area of the positive electrode tab to the area of the exposed portion of the positive electrode current collector and the area of the current collector joint to the area of the positive electrode tab By setting the ratio within the range according to the present technology, the reliability of the connection between the positive electrode tab and the battery element can be improved, and the space efficiency inside the secondary battery can be improved.
  • the ratio of the area of the current collector joint to the area of the exposed portion of the positive electrode current collector is 0.005 or more and 0.03 or less (Examples 5 to 7, 11 to 13, 15), the positive electrode tab of the positive electrode tab. It is possible to suppress an increase in the occupied area and maintain better internal resistance and vibration resistance. That is, in the secondary battery according to the present embodiment, the ratio of the area of the current collector joint to the area of the exposed portion of the positive electrode collector is within the above range, so that the connection between the positive electrode tab and the battery element is reliable. It is possible to better balance the property with the space efficiency inside the secondary battery.
  • Example 16 to 21 Further, the secondary batteries according to Examples 16 to 21 were manufactured by changing the area of the wiring joint between the positive electrode tab and the positive electrode lead with respect to the secondary battery according to the above-mentioned Example 7.
  • Table 3 shows the area of the wiring joint between the positive electrode tab and the positive electrode lead in the secondary batteries according to Examples 16 to 21, and the ratio of the area of the wiring joint to the area of the current collector joint.
  • the secondary battery can further reduce the defect rate in the joining process while maintaining the reliability of the connection from the positive electrode current collector to the positive electrode lead via the current collector joint and the wiring joint.
  • Example 22 to 26 Further, the secondary batteries according to Examples 22 to 26 were manufactured by changing the thickness of the positive electrode lead with respect to the secondary battery according to the above-mentioned Example 19.
  • Table 4 shows the thickness of the positive electrode lead in the secondary batteries according to Examples 22 to 26, and the ratio of the thickness of the positive electrode tab to the thickness of the positive electrode lead.
  • the process defect rate in the secondary battery is further reduced. be able to. Therefore, the secondary battery can further reduce the defect rate in the bonding process while maintaining the reliability of bonding between the positive electrode tab and the positive electrode lead.
  • the element structure of the battery element 20 is a wound type (wound electrode body)
  • the element structure of the battery element 20 is not particularly limited.
  • the battery element 20 has another element structure such as a laminated type (laminated electrode body) in which electrodes (positive electrode 21 and negative electrode 22) are laminated and a ninety-nine fold type in which electrodes (positive electrode 21 and negative electrode 22) are folded in a zigzag manner. But it may be.
  • the electrode reactant is lithium
  • the electrode reactant is not particularly limited.
  • the electrode reactant may be another alkali metal such as sodium and potassium, or an alkaline earth metal such as beryllium, magnesium and calcium.
  • the electrode reactant may be another light metal such as aluminum.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne une batterie secondaire qui comprend : un élément extérieur flexible (10) ; un élément de batterie (20) qui est logé à l'intérieur de l'élément extérieur et qui est de forme plate ; des premiers éléments de câblage (30, 40) s'étendant de l'intérieur vers l'extérieur de l'élément extérieur ; et une pluralité de seconds éléments de câblage (50, 60) qui sont disposés à l'intérieur de l'élément extérieur et qui sont reliés aux premiers éléments de câblage. L'élément de batterie comprend des collecteurs de courant d'électrode (21A, 22A), une couche de matériau actif d'électrode positive (21B) ou une couche de matériau actif d'électrode négative (22B) étant formée sur au moins une surface de chacun d'eux. Les collecteurs de courant d'électrode comprennent une pluralité de parties d'exposition (21AH, 22AH) dépourvues de couche de matériau actif d'électrode positive ou de couche de matériau actif d'électrode négative. La pluralité de parties d'exposition sont respectivement pourvues de parties de jonction de collecteur de courant (55) destinées à relier les collecteurs de courant d'électrode à la pluralité de seconds éléments de câblage. Le rapport de la surface des seconds éléments de câblage par rapport à la surface des parties d'exposition est de 0,015 à 0,95. Le rapport de la surface des parties de jonction de collecteur de courant par rapport à la surface des seconds éléments de câblage est de 0,04 à 0,625.
PCT/JP2021/009520 2020-06-25 2021-03-10 Batterie secondaire WO2021261029A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115133198A (zh) * 2022-07-28 2022-09-30 维沃移动通信有限公司 电池结构和电子设备

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WO2013183530A1 (fr) * 2012-06-04 2013-12-12 Ｎｅｃエナジーデバイス株式会社 Électrode négative pour cellule secondaire au lithium-ion, suspension d'électrode négative pour cellule secondaire au lithium-ion, et cellule secondaire au lithium-ion
JP2014060004A (ja) * 2012-09-14 2014-04-03 Toshiba Corp 電池
JP2018156840A (ja) * 2017-03-17 2018-10-04 株式会社東芝 二次電池、電池パック及び車両
WO2019187775A1 (fr) * 2018-03-28 2019-10-03 三洋電機株式会社 Batterie et son procédé de fabrication
CN210805919U (zh) * 2019-10-16 2020-06-19 宁德时代新能源科技股份有限公司 二次电池及其电极构件、电池模块和使用二次电池的装置

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WO2013183530A1 (fr) * 2012-06-04 2013-12-12 Ｎｅｃエナジーデバイス株式会社 Électrode négative pour cellule secondaire au lithium-ion, suspension d'électrode négative pour cellule secondaire au lithium-ion, et cellule secondaire au lithium-ion
JP2014060004A (ja) * 2012-09-14 2014-04-03 Toshiba Corp 電池
JP2018156840A (ja) * 2017-03-17 2018-10-04 株式会社東芝 二次電池、電池パック及び車両
WO2019187775A1 (fr) * 2018-03-28 2019-10-03 三洋電機株式会社 Batterie et son procédé de fabrication
CN210805919U (zh) * 2019-10-16 2020-06-19 宁德时代新能源科技股份有限公司 二次电池及其电极构件、电池模块和使用二次电池的装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115133198A (zh) * 2022-07-28 2022-09-30 维沃移动通信有限公司 电池结构和电子设备

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