WO2019130502A1 - Procédé de fabrication de batterie secondaire - Google Patents

Procédé de fabrication de batterie secondaire Download PDF

Info

Publication number
WO2019130502A1
WO2019130502A1 PCT/JP2017/047026 JP2017047026W WO2019130502A1 WO 2019130502 A1 WO2019130502 A1 WO 2019130502A1 JP 2017047026 W JP2017047026 W JP 2017047026W WO 2019130502 A1 WO2019130502 A1 WO 2019130502A1
Authority
WO
WIPO (PCT)
Prior art keywords
exterior member
flange
opening
convex portion
forming
Prior art date
Application number
PCT/JP2017/047026
Other languages
English (en)
Japanese (ja)
Inventor
博清 間明田
橋本　達也
Original Assignee
株式会社 東芝
東芝インフラシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 東芝, 東芝インフラシステムズ株式会社 filed Critical 株式会社 東芝
Priority to CN201780094287.0A priority Critical patent/CN111052442B/zh
Priority to PCT/JP2017/047026 priority patent/WO2019130502A1/fr
Priority to JP2019561492A priority patent/JP6862577B2/ja
Publication of WO2019130502A1 publication Critical patent/WO2019130502A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases

Definitions

  • Embodiments of the present invention relate to a method of manufacturing a secondary battery.
  • a secondary battery in general, includes an electrode group including a positive electrode and a negative electrode, and an exterior part that houses the electrode group.
  • the exterior part may be formed of two exterior members, and each of the two exterior members may be formed of stainless steel.
  • the first exterior member which is one of the exterior members, is formed in a bottomed tubular shape having a bottom wall and a side wall, and the bottom wall and the side wall define a storage space for housing the electrode group. Ru.
  • the storage space has an opening on the opposite side to the bottom wall.
  • a flange is formed at a portion opposite to the bottom wall, and the flange defines the edge of the opening of the storage space.
  • the second exterior member is disposed to face the flange and closes the opening of the storage space.
  • the welding part to which a flange and a 2nd exterior member are airtightly welded is formed in the outer side of the edge of opening. The welds are formed all around the opening. The welding space seals the storage space from the outside.
  • the secondary battery as described above is required to discharge gas from the storage space at the time of manufacture from the viewpoint of preventing an increase in internal resistance and preventing a decrease in life. And at the time of manufacture, in the state where gas was discharged from storage space, it is required to weld a flange and a 2nd exterior member airtightly, and to seal storage space to the exterior.
  • the problem to be solved by the present invention is to provide a method of manufacturing a secondary battery in which gas is properly discharged from the storage space to the outside at the time of manufacture.
  • a method of manufacturing a secondary battery includes forming an electrode group including a positive electrode and a negative electrode, and forming a first exterior member and a second exterior member from stainless steel.
  • the first exterior member is formed such that a storage space is defined by the bottom wall and the side wall, and the storage space has an opening on the opposite side to the bottom wall.
  • a flange is formed at a portion opposite to the bottom wall, and the flange is formed in a state in which the flange defines the edge of the opening of the storage space.
  • the convex portion is formed on the flange in the formation of the flange, or is formed on the second exterior member in the formation of the second exterior member.
  • the second exterior member in a state where the electrode group is disposed in the storage space, the second exterior member is disposed to face the flange to close the opening of the storage space.
  • the convex part formed in one of a flange and a 2nd exterior member is arrange
  • the second exterior member is disposed.
  • the flange and the second exterior member are airtightly welded over the entire circumference of the opening outside the convex portion to form a welded portion.
  • the gas in the storage space is discharged from the unsealing position in the vicinity of the convex portion between the welding portion and the convex portion.
  • FIG. 1 is a perspective view schematically showing an example of a secondary battery manufactured by the manufacturing method according to the first embodiment.
  • FIG. 2 is a perspective view schematically showing the secondary battery of FIG. 1 with the first exterior member, the second exterior member, and the electrode group disassembled with respect to each other.
  • FIG. 3 is a schematic view illustrating the configuration of the electrode group of the secondary battery of FIG.
  • FIG. 4 is a schematic view showing an electrical connection configuration of the electrode group to the positive electrode terminal (negative electrode terminal) in the secondary battery of FIG.
  • FIG. 5 is a schematic view showing the secondary battery of FIG. 1 as viewed from the side where the bottom wall of the first exterior member is located in the thickness direction.
  • FIG. 1 is a perspective view schematically showing an example of a secondary battery manufactured by the manufacturing method according to the first embodiment.
  • FIG. 2 is a perspective view schematically showing the secondary battery of FIG. 1 with the first exterior member, the second exterior member, and the electrode group disassembled with respect to each other.
  • FIG. 3
  • FIG. 6 is a schematic view showing a state in which the second exterior member is disposed to face the flange at the time of production of the secondary battery by the production method according to the first embodiment.
  • FIG. 7A is a schematic view showing the configuration of the convex portion and the vicinity thereof in the state of FIG. 6 at the time of manufacture in the first example of the first embodiment.
  • FIG. 7B is a cross-sectional view schematically showing a V1-V1 cross section of FIG. 7A.
  • FIG. 7C is a cross-sectional view schematically showing a V2-V2 cross section of FIG. 7A.
  • FIG. 8A is a schematic view showing a configuration of a convex portion and the vicinity thereof in a state of FIG.
  • FIG. 8B is a cross-sectional view schematically showing a V3-V3 cross section of FIG. 8A.
  • FIG. 9A is a schematic view showing a configuration of a convex portion and the vicinity thereof in a state of FIG. 6 at the time of manufacture in a third example of the first embodiment.
  • FIG. 9B is a cross-sectional view schematically showing a V4-V4 cross section of FIG. 9A.
  • FIG. 9C is a cross-sectional view schematically showing a V5-V5 cross section of FIG. 9A.
  • FIG. 10 is a schematic view showing a state in which the flange and the second exterior member are airtightly welded in a partial range in the circumferential direction of the opening from the state of FIG.
  • FIG. 11 is a schematic view showing a state in which the electrolytic solution is injected into the storage space from the state of FIG. 10 and the flange and the second exterior member are airtightly welded in the range not welded in the circumferential direction of the opening. is there.
  • FIG. 12 is a schematic view showing a state in which gas is discharged from the unsealing hole in the vicinity of one of the convex portions to the outside of the exterior portion in the state of FIG. FIG.
  • FIG. 13 is a schematic view showing a state in which a welded portion is formed between the opening and the convex portion from which the gas is discharged, from the state of FIG. 14 is a schematic view showing a state in which an opening hole different from the opening hole from which the gas is discharged in FIG. 12 is formed in the vicinity of the other of the convex portions from the state of FIG.
  • FIG. 15 is a schematic view showing a state in which gas is discharged from the opening hole formed in FIG. 14 from the state of FIG. 14 and a welded portion is formed between the opening hole and the convex portion.
  • FIG. 16 is a schematic view showing a state in which a weld is formed between the edge of the opening and the projection from the state of FIG. FIG.
  • FIG. 17 is a cross-sectional view schematically showing a convex portion and the vicinity thereof in a state in which the internal pressure inside the exterior portion is lower than the external pressure outside the exterior portion in the first embodiment.
  • FIG. 18 is a cross-sectional view schematically showing a convex portion and its neighborhood in a state in which the internal pressure inside the exterior portion is lower than the external pressure outside the exterior portion in the second embodiment.
  • FIG. 19 is a schematic view showing a system used for verification regarding a pressure reduction state of the storage space at the time of manufacturing the secondary battery by the manufacturing method according to the first embodiment.
  • FIG. 20 is a schematic diagram showing measurement results of temporal changes in the degree of vacuum of a storage space of a subject in verification using the system of FIG.
  • FIG. 1 shows an example of a secondary battery 1 manufactured by the manufacturing method according to the first embodiment.
  • the secondary battery 1 is, for example, a non-aqueous electrolyte battery.
  • the secondary battery 1 includes an exterior portion 3.
  • the exterior part 3 is formed of a first exterior member 5 and a second exterior member 6.
  • Each of exterior members 5 and 6 is formed of stainless steel.
  • the first exterior member 5 is formed in a bottomed tubular shape.
  • the first exterior member 5 has a bottom wall 7 and four side walls 8A to 8D, and is formed in a substantially rectangular cylindrical shape with a bottom.
  • the storage space 11 is defined by the bottom wall 7 and the side walls 8A to 8D.
  • the electrode group 10 is stored in the storage space 11.
  • FIG. 2 shows the first exterior member 5, the second exterior member 6 and the electrode group 10 in a disassembled state with respect to each other.
  • the storage space 11 has an opening 12 on the side opposite to the bottom wall 7.
  • a thickness direction (direction indicated by the arrow Z1 and the arrow Z2) perpendicular to or substantially perpendicular to the lateral direction is defined.
  • the side walls 8A and 8B are disposed longitudinally separated from each other with the storage space 11 therebetween, and the sidewalls 8C and 8D are disposed laterally separated from each other with the storage space 11 interposed therebetween. Be done. Further, each of the side walls 8A to 8D extends from the bottom wall 7 toward the opening 12 along the thickness direction, and the storage space 11 extends toward the one side in the thickness direction (arrow Z2 side) in the opening 12 Open.
  • a flange 13 is provided at a position opposite to the bottom wall 7.
  • the flange 13 protrudes outward, ie, away from the opening 12, with respect to the side walls 8A to 8D. Then, the flange 13 defines the edge 15 of the opening 12 over the entire circumference of the opening 12 in the circumferential direction.
  • the second exterior member 6 is formed in a plate shape, and is, for example, a substantially rectangular plate member. The second exterior member 6 is disposed to face the flange 13 and faces the flange 13 from the side where the opening 12 is opened.
  • the second exterior member 6 protrudes outward with respect to the side walls 8A to 8D, that is, away from the opening 12, over the entire circumferential direction of the opening 12. For this reason, in the region outside the edge 15 of the opening 12, the second exterior member 6 faces the flange 13 over the entire circumferential direction of the opening 12. Further, the second exterior member 6 is disposed in a state where the thickness direction of the plate-like second exterior member 6 matches or substantially matches the thickness direction of the secondary battery 1. As described above, the second exterior member 6 closes the opening 12 of the storage space 11 by arranging the second exterior member 6.
  • the distance from the bottom wall 7 to the opening 12 is much smaller than the distance between the side walls 8A and 8B and the distance between the side walls 8C and 8D, respectively.
  • the dimension in the thickness direction is much smaller than each of the dimension in the longitudinal direction and the dimension in the lateral direction.
  • the distance between the side walls 8A and 8B is smaller than the distance between the side walls 8C and 8D
  • the dimension in the vertical direction is smaller than the dimension in the horizontal direction. Small.
  • the first exterior member 5 has a thickness of 0.02 mm or more and 0.3 mm or less in each of the bottom wall 7, the side walls 8A to 8D, and the flange 13.
  • the plate-like second exterior member 6 has a thickness of 0.02 mm or more and 0.3 mm or less.
  • FIG. 3 is a diagram for explaining the configuration of the electrode group 10.
  • the electrode group 10 is formed in, for example, a flat shape, and includes a positive electrode 21, a negative electrode 22, and separators 23 and 25.
  • the positive electrode 21 includes a positive electrode current collector foil 21A as a positive electrode current collector, and a positive electrode active material containing layer 21B supported on the surface of the positive electrode current collector foil 21A.
  • the positive electrode current collector foil 21A is, for example, an aluminum foil or an aluminum alloy foil, and has a thickness of about 10 ⁇ m to 20 ⁇ m.
  • a slurry containing a positive electrode active material, a binder, and a conductive agent is applied to the positive electrode current collector foil 21A.
  • the positive electrode active material examples include, but are not limited to, oxides, sulfides, polymers, and the like that can occlude and release lithium. Further, from the viewpoint of obtaining a high positive electrode potential, as the positive electrode active material, lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium iron phosphate and the like are preferably used.
  • the negative electrode 22 includes a negative electrode current collector foil 22A as a negative electrode current collector, and a negative electrode active material containing layer 22B supported on the surface of the negative electrode current collector foil 22A.
  • the negative electrode current collector foil 22A is an aluminum foil, an aluminum alloy foil, a copper foil or the like, and has a thickness of about 10 ⁇ m to 20 ⁇ m.
  • a slurry containing a negative electrode active material, a binder, and a conductive agent is applied to the negative electrode current collector foil 12A.
  • the negative electrode active material is not particularly limited, and examples thereof include metal oxides capable of inserting and extracting lithium ions, metal sulfides, metal nitrides, and carbon materials.
  • a negative electrode active material a substance having a lithium ion absorption / discharge potential of 0.4 V or more with respect to the metal lithium potential, that is, a lithium ion absorption / discharge potential of 0.4 V (vs. Li + / Li) or more It is preferably a substance.
  • the negative electrode active material having such a lithium ion storage and release potential an alloy reaction between aluminum or an aluminum alloy and lithium is suppressed. Therefore, aluminum and a component related to the negative electrode current collector foil 22A and the negative electrode 22 Aluminum alloy can be used.
  • a negative electrode active material having a lithium ion storage and release potential of 0.4 V vs.
  • Li + / Li or more, for example, titanium oxide, lithium titanium composite oxide such as lithium titanate, tungsten oxide, amorphous tin Examples thereof include oxides, niobium-titanium composite oxides, tin silicon oxides, and silicon oxides. It is particularly preferable to use lithium titanium composite oxides as the negative electrode active material.
  • the carbon material which occludes-discharges lithium ion as a negative electrode active material, it is good for the negative electrode current collection foil 22A to use copper foil.
  • the carbon material used as the negative electrode active material has a lithium ion storage and release potential of about 0 V (vs. Li + / Li).
  • the aluminum alloy used for the positive electrode current collector foil 21A and the negative electrode current collector foil 22A desirably contains one or more elements selected from Mg, Ti, Zn, Mn, Fe, Cu and Si.
  • the purity of aluminum and aluminum alloy can be 98% by weight or more, preferably 99.99% by weight or more.
  • pure aluminum having a purity of 100% can be used as a material of the positive electrode current collector and / or the negative electrode current collector.
  • the content of transition metals such as nickel and chromium in aluminum and aluminum alloys is preferably 100 ppm by weight or less (including 0 ppm by weight).
  • positive electrode current collection tab 21D is formed of one long edge 21C and its neighborhood part. In the present embodiment, the positive electrode current collection tab 21D is formed over the entire length of the long edge 21C. In the positive electrode current collection tab 21D, the positive electrode active material containing layer 21B is not supported on the surface of the positive electrode current collection foil 21A. Further, in the negative electrode current collector foil 22A, the negative electrode current collector tab 22D is formed by one long edge 22C and the vicinity thereof. In the present embodiment, the negative electrode current collection tab 22D is formed over the entire length of the long edge 22C. In the negative electrode current collection tab 22D, the negative electrode active material containing layer 22B is not supported on the surface of the negative electrode current collection foil 22A.
  • Each of the separators 23 and 25 is formed of an electrically insulating material, and electrically insulates between the positive electrode 21 and the negative electrode 22.
  • Each of the separators 23 and 25 may be a sheet or the like separate from the positive electrode 21 and the negative electrode 22, or may be integrally formed with one of the positive electrode 21 and the negative electrode 22.
  • the separators 23 and 25 may be formed of an organic material, may be formed of an inorganic material, or may be formed of a mixture of an organic material and an inorganic material. Examples of the organic material forming the separators 23 and 25 include engineering plastic and super engineering plastic.
  • Examples of engineering plastics include polyamide, polyacetal, polybutylene terephthalate, polyethylene terephthalate, syndiotactic polystyrene, polycarbonate, polyamide imide, polyvinyl alcohol, polyvinylidene fluoride and modified polyphenylene ether.
  • Examples of super engineering plastics include polyphenylene sulfide, polyetheretherketone, liquid crystal polymer, polyvinylidene fluoride, polytetrafluoroethylene (PTFE), polyether nitrile, polysulfone, polyacrylate, polyether imide, thermoplastic polyimide and the like.
  • oxides for example, aluminum oxide, silicon dioxide, magnesium oxide, phosphorus oxide, calcium oxide, iron oxide, titanium oxide
  • nitrides for example, boron nitride, Aluminum nitride, silicon nitride, barium nitride
  • winding axis B of positive electrode 21, negative electrode 22, and separators 23 and 25 is in a state in which each of separators 23 and 25 is sandwiched between positive electrode active material-containing layer 21B and negative electrode active material-containing layer 22B.
  • the positive electrode 21, the separator 23, the negative electrode 22, and the separator 25 are wound in a stacked state in this order.
  • the positive electrode current collection tab 21D of the positive electrode current collector foil 21A protrudes to one side in the direction along the winding axis B with respect to the negative electrode 22 and the separators 23 and 25.
  • the negative electrode current collection tab 22D of the negative electrode current collection foil 22A protrudes to the side opposite to the side where the positive electrode current collection tab 21D protrudes in the direction along the winding axis B with respect to the positive electrode 21 and the separators 23 and 25.
  • the electrode group 10 is disposed such that the winding axis B is parallel or substantially parallel to the lateral direction of the secondary battery 1.
  • the electrode group 10 is impregnated with an electrolytic solution (not shown) in the storage space 11.
  • an electrolytic solution (not shown) in the storage space 11.
  • a non-aqueous electrolytic solution is used as the electrolytic solution, and for example, a non-aqueous electrolytic solution prepared by dissolving the electrolyte in an organic solvent is used.
  • lithium perchlorate LiClO 4
  • LiPF 6 lithium hexafluorophosphate
  • LiBF 4 lithium tetrafluoroborate
  • LiAsF 6 lithium hexafluoride arsenic
  • lithium salts such as lithium trifluoromethanesulfonate (LiCF 3 SO 3 ) and bistrifluoromethylsulfonylimide lithium [LiN (CF 3 SO 2 ) 2 ], and mixtures thereof.
  • organic solvents such as propylene carbonate (PC), ethylene carbonate (EC) and vinylene carbonate; linear carbonates such as diethyl carbonate (DEC), dimethyl carbonate (DMC) and methyl ethyl carbonate (MEC); Cyclic ethers such as (THF), 2-methyltetrahydrofuran (2MeTHF), and dioxolane (DOX); linear ethers such as dimethoxyethane (DME) and diethoxyethane (DEE); ⁇ -butyrolactone (GBL), acetonitrile (AN) And sulfolane (SL). These organic solvents are used alone or as a mixed solvent.
  • PC propylene carbonate
  • EC ethylene carbonate
  • MEC methyl ethyl carbonate
  • Cyclic ethers such as (THF), 2-methyltetrahydrofuran (2MeTHF), and dioxolane (DOX)
  • linear ethers such as dimethoxy
  • a gel non-aqueous electrolyte in which a non-aqueous electrolyte and a polymer material are complexed is used as the electrolyte.
  • the aforementioned electrolyte and organic solvent are used.
  • PVdF polyvinylidene fluoride
  • PAN polyacrylonitrile
  • PEO polyethylene oxide
  • solid electrolytes such as a polymer solid electrolyte and an inorganic solid electrolyte are provided as the non-aqueous electrolyte instead of the electrolytic solution.
  • the separators 23 and 25 may not be provided in the electrode group 10.
  • a solid electrolyte is sandwiched between the positive electrode 21 and the negative electrode 22. Therefore, in the present embodiment, the positive electrode 21 and the negative electrode 22 are electrically insulated by the solid electrolyte.
  • an inclined surface 26 is provided on the outer surface of the first exterior member 5 between the bottom wall 7 and the side wall 8C. Further, an inclined surface 27 is provided on the outer surface of the first exterior member 5 between the bottom wall 7 and the side wall 8D.
  • the positive electrode terminal 31 is attached to the inclined surface 26, and the negative electrode terminal 32 is attached to the inclined surface 27.
  • Each of the terminals 31 and 32 is formed of a conductive material, for example, any of aluminum, copper and stainless steel.
  • FIG. 4 shows an electrical connection configuration of the electrode group 10 to the positive electrode terminal 31 (negative electrode terminal 32).
  • the positive electrode current collection tab 21D of the electrode group 10 is bundled by welding such as ultrasonic welding, and the bundle of the positive electrode current collection tab 21D is connected to the positive electrode backup lead 35 by welding such as ultrasonic welding. Be done.
  • the positive electrode backup lead 35 is connected to the positive electrode lead 36 by welding such as ultrasonic welding, and the positive electrode lead 36 is connected to the positive electrode terminal lead 37 by welding such as ultrasonic welding.
  • the positive electrode terminal lead 37 is connected to the positive electrode terminal 31.
  • Each of the positive electrode backup lead 35, the positive electrode lead 36, and the positive electrode terminal lead 37 is formed of a conductive material.
  • the positive electrode current collection tab 21D is electrically connected to the positive electrode terminal 31 via the positive electrode backup lead 35, the positive electrode lead 36 and the positive electrode terminal lead 37.
  • Each of the positive electrode current collection tab 21D, the positive electrode backup lead 35, the positive electrode lead 36, the positive electrode terminal lead 37, and the positive electrode terminal 31 is electrically insulated from the exterior members 5 and 6.
  • the negative electrode current collection tab 22D of the electrode group 10 is bundled by welding such as ultrasonic welding, and the bundle of the negative electrode current collection tab 22D is connected to the negative electrode backup lead 41 by welding such as ultrasonic welding.
  • the negative electrode backup lead 41 is connected to the negative electrode lead 42 by welding such as ultrasonic welding, and the negative electrode lead 42 is connected to the negative electrode terminal lead 43 by welding such as ultrasonic welding. Then, the negative electrode terminal lead 43 is connected to the negative electrode terminal 32.
  • Each of the negative electrode backup lead 41, the negative electrode lead 42, and the negative electrode terminal lead 43 is formed of a conductive material.
  • the negative electrode current collection tab 22D is electrically connected to the negative electrode terminal 32 via the negative electrode backup lead 41, the negative electrode lead 42, and the negative electrode terminal lead 43.
  • Each of the negative electrode current collection tab 22D, the negative electrode backup lead 41, the negative electrode lead 42, the negative electrode terminal lead 43, and the negative electrode terminal 32 is electrically insulated from the exterior members 5 and 6.
  • FIG. 5 shows the secondary battery 1 as viewed from the side where the bottom wall 7 of the first exterior member 5 is located in the thickness direction.
  • welds 45 to 48 for airtightly welding the flange 13 and the second exterior member 6 are formed.
  • Each of the welds 45 to 48 is provided outside the edge 15 of the opening 12, that is, on the side away from the opening 12 with respect to the edge 15.
  • the welding portion 45 is formed in the flange 13 and the second exterior member 6 so as to protrude outward from the side wall 8A in the longitudinal direction, and is extended along the lateral direction.
  • the welding portion 46 is formed at a portion projecting outward from the side wall 8B in the longitudinal direction in the flange 13 and the second exterior member 6, and is extended along the lateral direction.
  • the welding portion 47 is formed in the flange 13 and the second exterior member 6 so as to protrude outward from the side wall 8C in the lateral direction, and is extended along the longitudinal direction.
  • the welding portion 48 is formed at a portion projecting outward from the side wall 8D in the lateral direction in the flange 13 and the second exterior member 6, and is extended along the longitudinal direction.
  • Welded parts 45 to 48 are indicated by broken lines in the view of secondary battery 1 in FIG. 5 etc. as viewed from one side in the thickness direction.
  • the welding portion 45 is continuous with the welding portion 47 at one end, and is continuous with the welding portion 48 at the other end.
  • the welding portion 46 is continuous with the welding portion 47 at one end, and is continuous with the welding portion 48 at the other end. Therefore, the flanges 13 and the second exterior member 6 are airtightly welded along the entire circumferential direction of the opening 12 by the welding portions 45 to 48. Therefore, the storage space 11 in which the electrode group 10 is stored is sealed from the exterior of the exterior 3 by the welds 45 to 48.
  • the welded portions 45 to 48 for example, the flange 13 and the second exterior member 6 are welded by resistance seam welding. Since resistance seam welding is performed, cost can be suppressed as compared with laser welding and the like, and airtightness between the flange 13 and the second exterior member 6 is high.
  • the first exterior member 5 is formed of stainless steel. At this time, the first exterior member 5 is formed such that the storage space 11 is defined by the bottom wall 7 and the side walls 8A to 8D, and the storage space 11 has an opening 12 on the opposite side to the bottom wall 7. . Moreover, the 1st exterior member 5 is formed in the thickness of 0.02 mm or more and 0.3 mm or less.
  • the flange 13 is formed at a portion of the first exterior member 5 opposite to the bottom wall 7. At this time, the flange 13 protrudes to the side away from the opening 12 with respect to the side walls 8A to 8D, and the flange 13 defines the edge 15 of the opening 12 over the entire circumferential direction of the opening 12 Is formed.
  • the second exterior member 6 is formed of stainless steel. In one embodiment, the second exterior member 6 is formed in a plate shape. Moreover, the 2nd exterior member 6 is formed in the thickness of 0.02 mm or more and 0.3 mm or less.
  • the electrode group 10 including the positive electrode 21 and the negative electrode 22 is formed. In one embodiment, the electrode group 10 is formed by winding the positive electrode 21, the negative electrode 22, and the separators 23 and 25 as described above. When the exterior members 5 and 6 and the electrode group 10 are formed, the electrode group 10 is disposed in the storage space 11. In one embodiment, in the housing space 11, the winding axis B is parallel or substantially parallel to the lateral direction of the secondary battery 1 in the storage space 11, in which the positive electrode 21, the negative electrode 22, and the separators 23 and 25 are wound. Place in the following condition.
  • the positive electrode current collection tab 21D of the electrode group 10 is electrically connected to the positive electrode terminal 31 via the positive electrode backup lead 35, the positive electrode lead 36 and the positive electrode terminal lead 37.
  • the negative electrode current collection tab 22D of the electrode group 10 is electrically connected to the negative electrode terminal 32 through the negative electrode backup lead 41, the negative electrode lead 42, and the negative electrode terminal lead 43.
  • an insulating member is provided which electrically insulates each of the positive electrode current collection tab 21D, the positive electrode backup lead 35, the positive electrode lead 36, the positive electrode terminal lead 37, and the positive electrode terminal 31 from the package members 5 and 6.
  • an insulating member is provided which electrically insulates each of the negative electrode current collection tab 22D, the negative electrode backup lead 41, the negative electrode lead 42, the negative electrode terminal lead 43, and the negative electrode terminal 32 from the package members 5 and 6.
  • FIG. 6 shows a state in which the second exterior member 6 is disposed to face the flange 13 when the secondary battery 1 is manufactured.
  • FIG. 6 is a view seen from the side where the bottom wall 7 of the first exterior member 5 is located.
  • the second exterior member 6 can be formed on the side walls 8A to 8D over the entire circumference of the opening 12 in the circumferential direction. On the other hand, it projects to the side away from the opening 12.
  • the second exterior member 6 disposed so as to face the flange 13 over the entire circumference of the opening 12 in the circumferential direction. Further, in the present embodiment, the second exterior member 6 is made to face the flange 13 in a state where the thickness direction of the plate-like second exterior member 6 matches or substantially matches the thickness direction of the secondary battery 1. .
  • the opening hole (first opening hole) 51 ⁇ / b> A is formed in the flange 13 in the formation of the flange 13 or in the second exterior member 6 in the formation of the second exterior member 6.
  • the opening hole 51A is formed.
  • the opening hole 51A is formed in one of the flange 13 and the second exterior member 6.
  • the opening hole 51A is formed to have a diameter ⁇ a.
  • the diameter ⁇ a is, for example, about 1 mm.
  • the convex portions 52 A and 52 B are formed on the flange 13 in the formation of the flange 13, or the convex portions 52 A and 52 B on the second exterior member 6 in the formation of the second exterior member 6.
  • the convex portions 52A and 52B are respectively formed on one of the flange 13 and the second exterior member 6.
  • the convex portion (first convex portion) 52A is formed in the vicinity of the opening hole 51A.
  • the convex portions 52A, 52B are formed at positions separated from each other.
  • the opening hole 51 ⁇ / b> A and the convex portions 52 ⁇ / b> A and 52 ⁇ / b> B are disposed outside the edge 15 of the opening 12.
  • each of the convex portions 52A and 52B is the other of the flange 13 and the second exterior member 6, that is, the flange 13 and the second exterior Of the portions, the protrusions 52A and 52B project toward one side where the protrusions 52A and 52B are not provided.
  • the second exterior member 6 is made to face the flange 13 in a state in which the projecting direction of the convex portions 52A and 52B matches or substantially matches the thickness direction of the secondary battery 1.
  • the second exterior member 6 is attached to the flange 13 in a state where the flanges 13 are provided with the convex portions 52A and 52B and each of the convex portions 52A and 52B protrudes toward the second exterior member 6. Let them face each other.
  • the flange 13 or the second exterior member 6 can be opened at a protruding portion outward in the longitudinal direction from the side wall 8A.
  • the holes 51A and the convex portions 52A and 52B are located.
  • convex part (the 1st convex part) 52A is located in the end by the side near side wall 8C about the horizontal direction
  • convex part (the 2nd convex part) 52B is the side near the side wall 8D about the horizontal direction Located at the end of the Therefore, in a state where the second exterior member 6 is disposed to face the flange 13, the convex portion 52 ⁇ / b> B is located apart from the opening hole 51 ⁇ / b> A and the convex portion 52 ⁇ / b> A in the lateral direction of the secondary battery 1.
  • the convex portions 52A and 52B are shown in black.
  • the opening hole (first opening hole) 51 ⁇ / b> A is arranged at a distance D1 a from the edge 15 of the opening 12.
  • the distance D1a is, for example, about 20 mm.
  • the opening hole 51A is disposed outside the projection (first projection) 52A, that is, on the side far from the opening 12 Be done.
  • convex part 52A is arranged near open hole 51A. At this time, the distance D2a from the opening hole 51A to the convex portion 52A is 6 mm or less.
  • the convex portion 52A is disposed at a distance D3 a from the edge 15 of the opening 12 and the convex portion 52B is at a distance from the edge 15 of the opening 12 D3b placed apart.
  • the distances D3a and D3b are the same or substantially the same size with respect to each other, and each of the distances D3a and D3b is, for example, about 4 mm.
  • 7A to 7C show a first embodiment of the configuration of the convex portion 52A (52B) and the vicinity thereof.
  • 7A to 7C show the convex portion 52A (52B) and the vicinity thereof in the state of FIG. 6 at the time of manufacture.
  • 7B shows a V1-V1 cross section of FIG. 7A
  • FIG. 7C shows a V2-V2 cross section of FIG. 7A.
  • the internal pressure inside the exterior 3 is the same as or substantially the same as the external pressure outside the exterior 3.
  • each of the convex portions 52A and 52B is formed into a tunnel ceiling form.
  • a longitudinal direction tunnel axis direction
  • a width direction perpendicular or substantially perpendicular to the longitudinal direction and a direction perpendicular or substantially perpendicular to the longitudinal direction and perpendicular to the width direction
  • a substantially vertical projecting direction is defined.
  • the longitudinal direction of each of the convex portions 52A and 52B is made to coincide or substantially coincide with the longitudinal direction of the secondary battery 1
  • the width direction of each of the convex portions 52A and 52B is the lateral direction of the secondary battery 1 Match or almost match.
  • the convex portion 52A (52B) is shown in a cross section perpendicular or substantially perpendicular to the longitudinal direction, and in FIG. 7C, the convex portion 52A (52B) is parallel or substantially to the longitudinal direction It is shown in a cross section which is parallel and perpendicular to or substantially perpendicular to the width direction.
  • the cross-sectional shape perpendicular or substantially perpendicular to the longitudinal direction is made uniform or substantially uniform over the entire length in the longitudinal direction. Further, in the present embodiment, the cross-sectional shape perpendicular or substantially perpendicular to the longitudinal direction of each of the convex portions 52A and 52B is formed in a substantially U shape or a substantially semicircular arc shape. Each of the convex portions 52A and 52B is formed in a dimension (one corresponding to D4a and D4b) in the longitudinal direction. The dimensions D4a and D4b are the same or substantially the same size with respect to each other, and each of the dimensions D4a and D4b is, for example, about 10 mm.
  • each of the convex portions 52A and 52B is formed to have a width (one corresponding to W1a and W1b) in the width direction.
  • the widths W1a and W1b are the same or substantially the same size with respect to each other, and each of the widths W1a and W1b is, for example, about 1.2 mm.
  • each of convex part 52A, 52B is formed in the protrusion dimension (one side corresponding to P1a and P1b) to a protrusion end.
  • the protrusion dimensions P1a and P1b are the same or substantially the same size with respect to each other, and each of the protrusion dimensions P1a and P1b is, for example, about 0.4 mm.
  • FIGS. 8A and 8B show the configuration of the convex portions 52A1 and 52A2 (52B1 and 52B2) and the vicinity thereof in the state of FIG. 6 at the time of manufacture. Further, FIG. 8B shows a V3-V3 cross section of FIG. 8A.
  • each of the convex portions 52A1, 52A2, 52B1 and 52B2 is formed into a tunnel ceiling shape, similarly to the convex portions 52A and 52B of the first embodiment. Therefore, the longitudinal direction, the width direction, and the projecting direction are defined in each of the convex portions 52A1, 52A2, 52B1, and 52B2. Then, the longitudinal direction of each of the convex portions 52A1, 52A2, 52B1 and 52B2 is made to coincide or almost coincide with the longitudinal direction of the secondary battery 1, and the width direction of each of the convex portions 52A1, 52A2, 52B1 and 52B2 is made secondary It matches or almost matches the lateral direction of the battery 1.
  • each of the convex portions 52A1, 52A2, 52B1 and 52B2 the cross-sectional shape perpendicular or substantially perpendicular to the longitudinal direction is made uniform or substantially uniform over the entire length in the longitudinal direction. Further, in the present embodiment, the cross-sectional shape perpendicular or substantially perpendicular to the longitudinal direction of each of the convex portions 52A1, 52A2, 52B1 and 52B2 is formed in a substantially U shape or a substantially semicircular arc shape. In FIG. 8B, each of the convex portion 52A1 and the convex portion 52A2 (52B1 and 52B2) is shown in a cross section perpendicular or substantially perpendicular to the longitudinal direction.
  • the convex portions (first convex portions) 52A1 and 52A2 are formed to be close to each other. That is, the convex portion 52A1 is formed in the vicinity of the convex portion 52A2. And convex part 52A1, 52A2 is formed in the state extended in parallel or substantially parallel with respect to each other. Further, the convex portions 52A1 and 52A2 are formed in a state of being aligned along a specific direction. In this embodiment, the specific direction in which the convex portions 52A1 and 52A2 are arranged is made to coincide or substantially coincide with the lateral direction of the secondary battery 1, and be perpendicular or substantially perpendicular to the longitudinal direction of the convex portions 52A1 and 52A2. .
  • the convex portions 52A1 and 52A2 are formed over the same or substantially the same range with respect to each other in the longitudinal direction of the secondary battery 1. Similarly, the convex portions (second convex portions) 52B1 and 52B2 are formed to be close to each other. That is, the convex portion 52B1 is formed in the vicinity of the convex portion 52B2. And convex part 52B1, 52B2 is formed in the state extended in parallel or substantially parallel with respect to each other. Further, the convex portions 52B1 and 52B2 are formed in a state of being aligned along a specific direction.
  • the specific direction in which the convex portions 52B1 and 52B2 are arranged is made to coincide or substantially coincide with the lateral direction of the secondary battery 1, and be perpendicular or substantially perpendicular to the longitudinal direction of the convex portions 52B1 and 52B2. .
  • the convex portions 52B1 and 52B2 are formed over the same or substantially the same range with respect to each other in the longitudinal direction of the secondary battery 1.
  • Each of the convex portions 52A1, 52A2, 52B1 and 52B2 is formed in a dimension (corresponding one of D5a, D6a, D5b, D6b) in the longitudinal direction.
  • the dimensions D5a, D6a, D5b, and D6b are the same or substantially the same size with respect to one another, and each of the dimensions D5a, D6a, D5b, and D6b is, for example, about 10 mm.
  • each of the convex portions 52A1, 52A2, 52B1 and 52B2 is formed in a width (one corresponding to W2a, W3a, W2b, W3b) in the width direction.
  • the widths W2a, W3a, W2b, and W3b have the same or substantially the same size with respect to one another, and the widths W2a, W3a, W2b, and W3b each are, for example, about 1.2 mm.
  • each of convex part 52A1, 52A2, 52B1, 52B2 is formed in the protrusion dimension (corresponding one of P2a, P3a, P2b, P3b) to a protrusion end.
  • the protrusion dimensions P2a, P3a, P2b, and P3b are the same or substantially the same size as one another, and each of the protrusion dimensions P2a, P3a, P2b, and P3b is, for example, about 0.6 mm.
  • the convex portions 52A1 and 52A2 are formed so as to be separated from each other by a predetermined distance W4a in the predetermined direction in which the convex portions 52A1 and 52A2 are arranged, that is, the lateral direction of the secondary battery 1 in this embodiment.
  • the convex portions 52B1 and 52B2 are formed apart from each other by a predetermined distance W4b in the predetermined direction in which the convex portions 52B1 and 52B2 are arranged, in this embodiment, in the lateral direction of the secondary battery 1.
  • the separation distances W4a and W4b are the same or substantially the same size with respect to each other, and each of the widths W4a and W4b is, for example, about 0.6 mm.
  • each of the convex portions 52A and 52B is formed in a dome shape.
  • or FIG. 9C show the structure of convex part 52A (52B) in the state of FIG. 6 at the time of manufacture, and its vicinity.
  • 9B shows a V4-V4 cross section of FIG. 9A
  • FIG. 9C shows a V5-V5 cross section of FIG. 9A.
  • the cross section of FIG. 9B and the cross section of FIG. 9C are cross sections parallel or substantially parallel to the projecting direction of the convex portion 52A (52B), and are perpendicular or substantially perpendicular to each other.
  • each of the convex portions 52A and 52B is formed in a dome shape.
  • vertical to the longitudinal direction of each secondary battery 1 of convex part 52A, 52B is formed in substantially U shape or substantially semicircular arc shape.
  • vertical to the horizontal direction of each secondary battery 1 of convex part 52A, 52B is formed in substantially U shape or substantially semicircular arc shape. That is, in each of the convex portions 52A and 52B, the cross-sectional shape is formed in a U shape or a substantially semicircular arc shape in any cross section parallel or substantially parallel to the projecting direction.
  • the flange 13 and the second The exterior member 6 is airtightly welded.
  • the welds 46 to 48 are formed before injecting the electrolytic solution into the storage space 11.
  • welds 46 to 48 are formed by resistance seam welding.
  • the flange 13 and the second exterior member 6 are not welded in a partial range in the circumferential direction of the opening 12. For this reason, in the state of FIG. 10, the welded portion is not formed in the range in which the side wall 8A extends in the circumferential direction of the opening 12. Then, in the state of FIG.
  • the electrolytic solution is injected into the storage space 11 from a portion where the flange 13 and the second exterior member 6 are not welded. At this time, the electrolytic solution is injected from any part of the range in which the side wall 8A is extended in the circumferential direction of the opening 12. The electrolytic solution is injected into the storage space 11 through the gap between the flange 13 and the second exterior member 6.
  • the flange 13 and the second exterior member 6 are airtightly welded by resistance seam welding in a range in which welding is not performed in the circumferential direction of the opening. Thereby, the welding part 50 is formed.
  • the welded portion 50 is formed at a portion projecting outward from the side wall 8 ⁇ / b> A in the longitudinal direction.
  • the weld 50 is formed such that one end is continuous with the weld 47 and the other end is continuous with the weld 48.
  • the welding portion 50 is formed outside the opening hole 51A and the convex portions 52A and 52B, that is, on the side away from the opening 12.
  • welding portion 50 flanges 13 and second exterior member 6 are airtightly welded all around the circumferential direction of opening 12 by welding portions 46 to 48, 50. . That is, welds (first welds) 46 to 48, 50 for sealing the flange 13 and the second exterior member 6 airtightly are formed over the entire circumference in the circumferential direction of the opening 12. Further, by forming the welding portion 50, the inside (the storage space 11) of the exterior portion 3 communicates with the outside of the exterior portion 3 only with the opening hole 51A. In the view of the secondary battery 1 shown in FIG. 11 and the like as viewed from one side in the thickness direction, the welded portion 50 is indicated by a broken line.
  • the inside and the outside of the exterior portion 3 communicate with each other in the opening hole 51A.
  • the internal pressure (pressure of the storage space 11) inside the exterior 3 is the same as or substantially the same as the external pressure outside the exterior 3.
  • the flange 13 and the second exterior are spread over the whole or most of the area inside the welds 46 to 48, 50 and outside the edge 15 of the opening 12 A gap is formed between the member 6 and the member 6.
  • the flange 13 is in a region other than the projecting ends of the protrusions 52A, 52B, There is a gap between the second exterior member 6 and the second exterior member 6 so that the second exterior member 6 is not in close contact.
  • the operation of injecting the electrolytic solution may not be necessary.
  • the welds 46 to 48 may be formed after the welds 50 are formed.
  • the flange 13 and the second exterior member 6 are welded airtight all around the circumferential direction of the opening 12 by the welds (first welds) 46 to 48, 50. Ru.
  • the gas of the storage space 11 will be discharged
  • the suction pad 55 is attached to the outer surface of the exterior part 3 in the opening hole (1st opening position) 51A.
  • the suction pad 55 is connected to a pump 57 such as a vacuum pump via a suction tube 56.
  • a valve 61 and a vacuum regulator 62 are disposed in the suction path between the pump 57 and the suction pad 55.
  • the pump 57 is driven to open the valve 61.
  • gas flows from the storage space 11 to the opening hole 51A through the gap between the flange 13 and the second exterior member 6.
  • the gas is sucked into the inside of the suction tube 56 from the opening hole 51A, and the gas flows toward the pump 57 through the inside of the suction tube 56.
  • the discharge from the opening hole 51A is performed under an environment where the dew point temperature is -50.degree. C. or less.
  • the gas is discharged from the opening hole 51A to the outside of the exterior part 3 and the internal pressure inside the exterior part 3 such as the pressure of the storage space 11 decreases to a certain degree, as shown in FIG.
  • the flange 13 and the second exterior member 6 are airtightly welded between the opening position 51A and the convex portion 52A. That is, the welded portion 53A is formed between the opening hole 51A and the convex portion 52A.
  • Weld portion 53A is formed to be inclined with respect to the longitudinal direction and the lateral direction of secondary battery 1.
  • the welding portion 53A is formed such that one end is continuous with the welding portion 50 and the other end is continuous with the welding portion 47.
  • the path of the gas is blocked between the opening hole (first opening position) 51A and the convex portion (first convex portion) 52A.
  • the welded portion 53A is formed by, for example, resistance seam welding, similarly to the welded portions 46 to 48, 50. Moreover, in the figure which looked at the secondary battery 1 of FIG. 13 grade
  • welds 53A welds 46 to 48, 50, 53A at the inner side with respect to opening hole 51A, flange 13 and the second
  • the exterior member 6 is airtightly welded. Thereby, the storage space 11 in which the electrode group 10 is stored is sealed from the outside of the exterior 3.
  • the welding portion 53A When the welding portion 53A is formed, the portions outside the welding portions 46 to 48 in the flange 13 and the second exterior member 6 are cut. Then, the secondary battery 1 is charged (first charge) and aged. Thereby, gas is generated in the storage space 11 in which the electrode group 10 is stored. When the aging is performed as described above, it is necessary to discharge the gas generated by the aging to the outside of the exterior portion 3.
  • the aging temperature is desirably in the range of 70 ° C. or more and 90 ° C. or less.
  • the opening hole 51B is formed in one of the flange 13 and the second exterior member 6.
  • the opening hole 51 ⁇ / b> B is formed on the inner side with respect to the weld portion (first weld portion) 50, that is, on the side closer to the opening 12.
  • the opening hole 51B is formed on the outer side of the convex portion 52B, that is, on the side far from the opening 12. That is, the opening hole 51B is formed between the welding portion 50 and the convex portion 52B. At this time, the opening hole 51B is formed to have a diameter ⁇ b.
  • the diameter ⁇ b of the opening hole 51B is the same or substantially the same size as the diameter ⁇ a of the opening hole 51A, and is, for example, about 1 mm.
  • the opening hole (second opening hole) 51B is formed at a position separated from the edge 15 of the opening 12 by the distance D1b.
  • the distance D1b has the same or substantially the same size as the distance D1a, and is, for example, about 20 mm.
  • the worker forms the opening hole 51B in the vicinity of the convex portion 52B. At this time, the opening hole 51B is formed in a state where the distance D2b from the convex portion 52B to the opening hole 51B is 6 mm or less.
  • the opening hole 51B is formed at a position away from the opening hole 51A and the convex portion 52A in the lateral direction of the secondary battery 1.
  • a through-hole is first formed in both the flange 13 and the 2nd exterior member 6. As shown in FIG. Then, one of the two through holes is airtightly closed. Thereby, the unsealed one of the two through holes is used as the opening hole 51B.
  • the gas in the storage space 11 is discharged from the opening hole 51B to the outside of the exterior part 3. That is, from the unsealing position (second unsealing position) in the vicinity of the convex portion 52B between the weld portion (first welded portion) 50 and the convex portion (second convex portion) 52B, the storage space 11 Exhaust the gas. At this time, the gas is discharged from the opening hole 51B using the suction pad 55, the suction tube 56, the pump 57, the valve 61, the vacuum regulator 62, etc., similarly to the discharge of the gas from the opening hole (first opening position) 51A. Discharge.
  • the flange 13 and the second exterior member 6 are airtightly welded between the unsealing position 51B and the convex portion 52B. That is, the welded portion 53B is formed between the opening hole 51B and the convex portion 52B.
  • Welded portion 53 B is formed to be inclined with respect to the longitudinal direction and the lateral direction of secondary battery 1.
  • the welding portion 53 ⁇ / b> B is formed such that one end is continuous with the welding portion 50 and the other end is continuous with the welding portion 48.
  • the path of gas is blocked between the opening hole (second opening position) 51B and the convex portion (second convex portion) 52B.
  • the welded portion 53B is formed by, for example, resistance seam welding, similarly to the welded portions 46 to 48, 50, 53B.
  • the welding part 53B is shown with a broken line.
  • welds 53B By forming welds 53B, flanges 13 are provided along the entire circumferential direction of opening 12 by welds 46 to 48, 50, 53A, 53B at a portion inside the opening holes 51A, 51B. And the second exterior member 6 are airtightly welded. Thereby, the storage space 11 in which the electrode group 10 is stored is sealed again from the outside of the exterior 3. Once the weld portion 53B is formed, the capacity of the secondary battery 1 is confirmed.
  • the flange 13 and the second exterior member 6 are airtightly welded on the inner side of the convex portions 52A and 52B to form a welded portion (second welded portion) 45.
  • the welded portion 45 is formed after both the discharge of gas from the opening hole (first opening position) 51A and the discharge of gas from the opening hole (second opening position) 51B.
  • the weld 45 is formed on the outside of the edge 15 of the opening 12 by resistance seam welding.
  • the weld 45 is formed such that one end is continuous with the weld 47 and the other end is continuous with the weld 48.
  • the welding portion 45 is formed in the flange 13 and the second exterior member 6 so as to project outward from the side wall 8A in the longitudinal direction, and is extended along the lateral direction of the secondary battery 1 .
  • a welded portion (second welded portion) 45 By forming a welded portion (second welded portion) 45, the edge 15 of the opening 12 and the convex portion (first convex portion) 52A, and the edge 15 of the opening 12 and the convex portion (second The gas path is blocked between the projection 52B and the projection 52B.
  • part outside the welding part 50 is cut.
  • opening hole (opening position) 51A, 51B and convex part 52A, 52B are removed.
  • the flanges 13 and the second exterior member 6 are airtightly welded along the entire circumferential direction of the opening 12 by the welding portions 45 to 48. Therefore, the storage space 11 in which the electrode group 10 is disposed is sealed to the outside of the exterior 3 even if the portion outside the weld 50 is cut.
  • the secondary battery 1 is manufactured.
  • the weld 45 is not formed.
  • the flanges 13 and the second exterior member 6 are airtightly welded over the entire circumference in the circumferential direction of the opening 12 by the welding portions 46 to 48, 50, 53A, 53B, and the storage space 11 faces the outside. Sealed. Further, in the present embodiment, the convex portions 52A and 52B and the opening holes 51A and 51B are provided in the manufactured secondary battery 1.
  • the welding portion 45 is not formed, after the welding portion 53A is formed at the time of manufacture, the portion outside the welding portion 53A is cut in the flange 13 and the second exterior member 6. Thereby, the opening hole 51A is removed, and the opening hole 51A is not provided in the manufactured secondary battery 1.
  • the weld 45 is not formed, after the weld 53B is formed at the time of manufacture, a portion outside the weld 53B is cut in the flange 13 and the second exterior member 6. Thereby, the opening hole 51B is removed, and the opening hole 51B is not provided in the manufactured secondary battery 1.
  • secondary battery 1 is manufactured by cutting the portion outside weld 53A and the portion outside weld 53B during manufacturing. Both of the opening holes 51A and 51B are not provided.
  • the discharge of gas from the opening hole 51A and the discharge of gas from the opening hole 51B are performed.
  • the pressure of the storage space 11, that is, the internal pressure inside the exterior 3 decreases.
  • the internal pressure inside the exterior part 3 is lower than the external pressure outside the exterior part 3.
  • the flange 13 and the second exterior member 6 are in close contact with each other at the portion far from the convex portions 52A and 52B.
  • the convex portions 52A and 52B are provided on one of the flange 13 and the second exterior member 6, and the flange 13 and the second exterior member 6 are formed of stainless steel.
  • the flange 13 has a gap with respect to the second exterior member 6 in the vicinity of the protruding end of the convex portion 52A, and adheres to the second exterior member 6 do not do.
  • the flange 13 has a gap with respect to the second exterior member 6 in the vicinity of the projecting end of the convex portion 52B and adheres to the second exterior member 6 do not do.
  • the flange 13 abuts on the second exterior member 6 at the respective projecting ends of the convex portions 52A and 52B.
  • FIG. 17 shows the convex portion 52A (52B) and the vicinity thereof in the state where the internal pressure inside the exterior portion 3 is lower than the external pressure outside the exterior portion 3 in the configuration of the first embodiment described above.
  • the protrusions 52A (52B) are shown in a cross section perpendicular or substantially perpendicular to the longitudinal direction.
  • the flange 13 can be used as the second exterior member 6 in the vicinity of the projecting end of each of the convex portions 52A and 52B. On the other hand, it has a gap and does not adhere to the second exterior member 6.
  • the flange 13 has a second exterior in the vicinity of the projecting end of each of the convex portions 52A and 52B. There is a gap for the member 6 and it does not adhere to the second exterior member 6.
  • the flange 13 is a second exterior member in the vicinity of the projecting end of each of the convex portions 52A and 52B regardless of the magnitude of the external pressure and the internal pressure. There is a gap for 6 and it does not closely contact the second exterior member 6. For this reason, even if the internal pressure becomes lower than the external pressure by suction from one of the opening holes (opening position) 51A, 51B, the path of the gas is blocked in the vicinity of each projecting end of the convex portions 52A, 52B. It is secured without.
  • the gas is appropriately discharged from the opening holes 51A and 51B at the time of manufacture, and therefore, in the manufactured secondary battery 1, almost no gas remains in the inside of the exterior part 3, that is, the storage space 11. . Thereby, the secondary battery 1 having a low internal resistance and a long life is manufactured.
  • FIG. 18 shows the projections 52A1 and 52A2 (52B1 and 52B2) and their parts in the state where the internal pressure inside the exterior part 3 is lower than the external pressure outside the exterior part 3 in the configuration of the second embodiment described above. Indicates the neighborhood.
  • the convex portions 52A1 and 52A2 (52B1 and 52B2) are shown in a cross section perpendicular to or substantially perpendicular to the longitudinal direction. As shown in FIG.
  • each of the convex portions 52A1, 52A2, 52B1, 52B2 In the vicinity of the protruding end of the flange 13, the flange 13 has a gap with respect to the second exterior member 6 and does not adhere to the second exterior member 6. For this reason, as described above, even if the internal pressure becomes lower than the external pressure, the gas reaches the unsealing hole (one corresponding to 51A, 51B) and the gas from the unsealing hole (one corresponding to 51A, 51B) Exhausted.
  • the second of the flanges 13 is formed between the projecting ends of the convex portions 52A1 and 52A2.
  • the clearance of the outer member 6 to the outer member 6 is maintained large.
  • the convex portions 52B1 and 52B2 are close to each other, even if the internal pressure becomes lower than the external pressure, the number of flanges 13 is increased between the projecting ends of the convex portions 52B1 and 52B2. The gap between the two exterior members 6 is maintained large.
  • the opening is made from the storage space 11 through the vicinity of the projecting end of the convex portion 52A1, 52A2 or the vicinity of the projecting end of the convex portion 52B1, 52B2. It is easier for the gas to flow into the holes (corresponding ones of 51A, 51B). For this reason, in the second embodiment, the gas is more effectively discharged to the outside of the exterior portion 3 from the opening hole (one corresponding to 51A and 51B).
  • FIG. 19 shows a system used for verification of the reduced pressure state of the storage space 11 in the manufacture of the secondary battery 1.
  • a subject 1 ′ simulating the above-described secondary battery 1 was formed.
  • the exterior portion 3' is formed of the first exterior member 5 'and the second exterior member 6' made of stainless steel.
  • a bottom wall 7 'and side walls 8'A to 8'D are formed in the first exterior member 5' in the same manner as the first exterior member 5 described above to define a storage space 11 '.
  • storage space 11 ' was opened by opening 12' similarly to the 1st exterior member 5.
  • FIG. 19 shows a system used for verification of the reduced pressure state of the storage space 11 in the manufacture of the secondary battery 1.
  • flange 13 ' was formed in 1st exterior member 5' similarly to 1st exterior member 5, and edge 15 'of opening 12' of storage space 11 'was specified by flange 13'.
  • 2nd exterior member 6 ' was formed in plate shape similarly to the above-mentioned 2nd exterior member 6. As shown in FIG. And 2nd exterior member 6 'was arrange
  • welds 46' to 48 'and 50' similar to the welds 46 to 48 and 50 described above are formed by resistance seam welding, and the entire circumferential direction of the opening 12 'is provided.
  • the flange 13 'and the second exterior member 6' were airtightly welded.
  • the opening hole 51′A was formed at the same position as the above-described opening hole 51A in the flange 13 ′. Opening hole 51'A was formed inside with respect to welding part 50 '.
  • diameter phi'a was formed in 1 mm, and distance D'1a from edge 15 'of opening 12' to opening hole 51'A was 20 mm.
  • the opening hole corresponding to the opening hole 51B, the convex portion corresponding to the convex portion 52B (including 52B1 and 52B2) described above, and the welded portions 45, 53A and 53B described above are also supported. Welds are not formed.
  • the gas in the storage space 11 ' was discharged from the opening hole 51'A to the outside of the exterior portion 3'.
  • the gas was discharged in an environment with a dew point temperature of -60.degree.
  • the gas is discharged to the outside of the exterior portion 3 'using the suction pad 55, the suction tube 56, the pump 57, the valve 61 and the vacuum regulator 62. Discharged.
  • the suction pad 55 a flat pad manufactured by MISUMI, type ZP2-B10MTF was used.
  • a pump 57 of ULVAC, Inc., model DA41D having an effective pumping speed of 40 L / min (0.67 L / sec), an ultimate pressure of -98 kPa, and a set pressure of the vacuum regulator 62 of -100 kPa was used.
  • the attachment 65 was attached to the bottom wall 7 ′ of the first exterior member 5 ′, and the attachment 65 was connected to the pressure sensor 67 via the tube 66. And in the state which is discharging gas from opening hole 51'A, the pressure of storage space 11 ', ie, the internal pressure inside exterior part 3', was measured by the pressure sensor 67.
  • the attachment 65 was attached at a position diagonal to the opening 51'A, that is, in the vicinity of an angle formed by the side walls 8'B and 8'D.
  • a model M3-ALU-4 manufactured by SMC was used as the attachment 65.
  • a pressure sensor 67 a pressure sensor 67 having a rated pressure range of ⁇ 100 kPa was used, which is a model AP-10S manufactured by Keyence Corporation.
  • the gas was discharged from the opening hole 51′A under three conditions ⁇ 1 to ⁇ 3, and the temporal change of the pressure reduction degree ⁇ of the storage space 11 ′ from the start of the gas discharge was measured.
  • the measurement of the temporal change of the pressure reduction degree ⁇ was performed twice for each of the conditions ⁇ 1 to ⁇ 3.
  • the condition ⁇ 1 only the opening hole 51′A is provided outside the edge 15 ′ of the opening 12 ′ and in the region inside the welds 46 ′ to 48 ′ and 50 ′. Therefore, under the condition ⁇ 1, the configuration or the like corresponding to the above-described convex portion 52A (including 52A1 and 52A2) is not provided.
  • a convex portion 52'A similar to the convex portion 52A was provided on the flange 13 '.
  • the convex portion 52'A was formed in the same tunnel ceiling shape as the convex portion 52A, and at the same position as the convex portion 52A. Further, the convex portion 52'A was formed to have a dimension D'4a in the longitudinal direction of 10 mm, and a width W'1a in the width direction of 1.2 mm.
  • convex part 52'A formed protrusion dimension P'1a to 0.4 mm. Moreover, distance D'2a from convex part 52'A to opening hole 51'A was 6 mm, and distance D'3a from edge 15 'of opening 12' to convex part 52'A was 4 mm.
  • Convex part 52'A1, 52'A2 similar to convex part 52A1, 52A2 was provided in flange 13 '.
  • the convex portion 52'A1 was formed in the same tunnel ceiling shape as the convex portion 52A1, and was formed at the same position as the convex portion 52A1.
  • convex part 52'A2 was formed in the same position as convex part 52A2, while forming in tunnel ceiling shape similar to convex part 52A2.
  • Each of the convex portions 52'A1 and 52'A2 has a dimension in the longitudinal direction (one corresponding to D'5a and D'6a) of 10 mm, and a width in the width direction (W'2a and W'3a) The corresponding one of the above was formed to 1.2 mm. Moreover, each of convex part 52'A, 52'A2 formed protrusion dimension (one side corresponding to P'2a and P'3a) to 0.6 mm.
  • the distance D'2a from the convex portions 52'A1 and 52'A2 to the opening hole 51'A is 6 mm, and the distance D'3a from the edge 15 'of the opening 12' to the convex portions 52'A1 and 52'A2 To 4 mm. And separation distance W'4a between convex part 52'A1 and 52'A2 was 0.6 mm.
  • FIG. 20 shows the measurement results of temporal changes in the degree of pressure reduction ⁇ of the storage space 11 ′ in verification.
  • the horizontal axis indicates the time t based on the start of gas discharge from the opening hole 51′A
  • the vertical axis indicates the degree of pressure reduction ⁇ .
  • the time-dependent change of the pressure reduction degree (epsilon) in the 2nd measurement in conditions (alpha) 3 is shown.
  • the pressure reduction degree ⁇ was ⁇ 70 kPa or more and ⁇ 60 kPa or less at the time when 5 minutes passed from the start of gas discharge. That is, under the condition ⁇ 1, the pressure reduction degree ⁇ did not reach ⁇ 90 kPa even after 5 minutes from the start of gas discharge. Further, in the verification, after discharging the gas for 5 minutes under the condition ⁇ 1, the flange 13 ′ and the second exterior member 6 ′ were pulled away from each other by a mechanical force. At this time, the flange 13 'and the second exterior member 6' were mechanically pulled between the edge 15 'of the opening 12' and the opening hole 51'A.
  • the pressure reduction degree ⁇ became ⁇ 90 kPa when 3 minutes passed from the start of gas discharge. Therefore, in the configuration of the first embodiment etc. in which the same convex portion 52A (52B) as the convex portion 52'A is provided, even if the internal pressure becomes lower than the external pressure, the unsealing holes (51A, 51B) correspond to It has been verified that the gas reaches) and the gas is properly discharged to the outside of the exterior part 3.
  • the degree of pressure reduction ⁇ became ⁇ 90 kPa or less when one minute passed from the start of the gas discharge. Therefore, in the configuration of the second embodiment in which the convex portions 52A1 and 52A2 (52B1 and 52B2) similar to the convex portions 52'A1 and 52'A2 are provided, the internal pressure is lower than the external pressure, from the storage space 11 It has been verified that the gas can further easily flow to the corresponding one of the opening holes 51A and 51B, and the gas can be effectively discharged to the outside of the exterior part 3.
  • the gas is discharged from the opening hole (first opening position) 51A before charging and aging, and after charging and aging, the gas is discharged from the opening hole (second opening position) 51B. Is discharged to the outside, but it is not limited to this.
  • gas is discharged from the opening hole (second opening position) 51B before charging and aging, and gas is output from the opening hole (first opening position) 51A after charging and aging.
  • the opening 13 (second opening) 51 B is formed in the flange 13 in the formation of the flange 13, or the second exterior member 6 in the formation of the second exterior member 6. Form the opening hole 51B.
  • the opening hole (first opening hole) 51A is formed in a state in which the storage space 11 is sealed by the welds 46 to 48, 50, 53B.
  • the gas generated by the aging is discharged to the outside of the exterior part 3 from the formed opening hole 51A.
  • the weld portion 53A is formed, and the storage space 11 is sealed again from the outside of the exterior portion 3 by the weld portions 46 to 48, 50, 53A, 53B.
  • the secondary battery 1 in which only one electrode group 10 is stored in the storage space 11 is manufactured, in a modification, a plurality of electrode groups are stored in the storage space 11
  • the stored secondary battery 1 is also manufactured in the same manner as the above-described embodiment.
  • the second exterior member 6 is formed in a cylindrical shape with a bottom similar to the first exterior member 5 instead of a plate shape.
  • the second exterior member 6 is also formed to include the bottom wall, the side wall and the flange. Then, the flange 13 of the first exterior member 5 and the flange of the second exterior member 6 are airtightly welded at the welded portions 45 to 48 and the like. Also in the secondary battery 1 manufactured by the manufacturing method of this modification, the flanges 13 and the second exterior member 6 are airtightly welded over the entire circumference in the circumferential direction of the opening 12 by the welds 45 to 48. .
  • the storage space 11 in which the electrode group 10 is stored is sealed from the exterior of the exterior 3.
  • the second exterior member has a protrusion projecting from one of the flange and the second exterior member to the other, and the protrusion is It is disposed opposite to the flange of the first exterior member so as to be located outside the edge of the opening. Then, the flange and the second exterior member are airtightly welded in the welding portion on the outer side of the convex portion, and the gas in the storage space is discharged from the unsealing position in the vicinity of the convex portion between the welding portion and the convex portion. . Therefore, it is possible to provide a method of manufacturing a secondary battery in which gas is properly discharged from the storage space to the outside at the time of manufacture.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

Dans un procédé de fabrication selon un mode de réalisation de la présente invention, un premier élément extérieur est formé, un espace de stockage étant défini par une paroi inférieure et des parois latérales, et une bride sur le côté opposé à la paroi inférieure définit la périphérie d'une ouverture de l'espace de stockage, et un second élément extérieur est amené à faire face à la bride dans un état dans lequel un groupe d'électrodes est disposé dans l'espace de stockage. L'une de la bride et du second élément extérieur a une saillie formée à l'intérieur de celui-ci, ladite saillie faisant saillie vers l'autre, et la saillie étant disposée de manière à être située à l'extérieur de la périphérie de l'ouverture. Dans le procédé de fabrication, la bride et le second élément extérieur sont soudés de manière étanche à l'air au niveau d'une section de soudage sur l'extérieur de la saillie. Le gaz dans l'espace de stockage est évacué d'une position non étanche qui se trouve entre la section de soudage et la saillie et qui est au voisinage de la saillie.
PCT/JP2017/047026 2017-12-27 2017-12-27 Procédé de fabrication de batterie secondaire WO2019130502A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201780094287.0A CN111052442B (zh) 2017-12-27 2017-12-27 二次电池的制造方法
PCT/JP2017/047026 WO2019130502A1 (fr) 2017-12-27 2017-12-27 Procédé de fabrication de batterie secondaire
JP2019561492A JP6862577B2 (ja) 2017-12-27 2017-12-27 二次電池の製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/047026 WO2019130502A1 (fr) 2017-12-27 2017-12-27 Procédé de fabrication de batterie secondaire

Publications (1)

Publication Number Publication Date
WO2019130502A1 true WO2019130502A1 (fr) 2019-07-04

Family

ID=67066863

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/047026 WO2019130502A1 (fr) 2017-12-27 2017-12-27 Procédé de fabrication de batterie secondaire

Country Status (3)

Country Link
JP (1) JP6862577B2 (fr)
CN (1) CN111052442B (fr)
WO (1) WO2019130502A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115347284A (zh) * 2021-05-14 2022-11-15 中创新航科技股份有限公司 电池制造方法及电池

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003142043A (ja) * 2001-07-09 2003-05-16 Hitachi Maxell Ltd 電 池
JP2008103239A (ja) * 2006-09-20 2008-05-01 Dainippon Printing Co Ltd 扁平型電気化学セル及びそれを組み合わせてなる組電池
JP2010113869A (ja) * 2008-11-05 2010-05-20 Murata Mfg Co Ltd 蓄電デバイス
JP2010238860A (ja) * 2009-03-31 2010-10-21 Jm Energy Corp ラミネート外装蓄電デバイス
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426163B1 (en) * 1999-12-21 2002-07-30 Alcatel Electrochemical cell
JP2004103369A (ja) * 2002-09-09 2004-04-02 Matsushita Electric Ind Co Ltd 扁平角形電池及びその製造方法
JP5168540B2 (ja) * 2007-08-23 2013-03-21 トヨタ自動車株式会社 密閉型電池製造方法
US9741994B2 (en) * 2012-09-28 2017-08-22 Hitachi Automotive Systems, Ltd. Secondary battery with current breaking mechanism
US11011812B2 (en) * 2014-07-24 2021-05-18 Vehicle Energy Japan Inc. Secondary battery
KR102236347B1 (ko) * 2014-08-29 2021-04-05 에스케이이노베이션 주식회사 이차전지의 제조방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003142043A (ja) * 2001-07-09 2003-05-16 Hitachi Maxell Ltd 電 池
JP2008103239A (ja) * 2006-09-20 2008-05-01 Dainippon Printing Co Ltd 扁平型電気化学セル及びそれを組み合わせてなる組電池
JP2010113869A (ja) * 2008-11-05 2010-05-20 Murata Mfg Co Ltd 蓄電デバイス
JP2010238860A (ja) * 2009-03-31 2010-10-21 Jm Energy Corp ラミネート外装蓄電デバイス
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115347284A (zh) * 2021-05-14 2022-11-15 中创新航科技股份有限公司 电池制造方法及电池

Also Published As

Publication number Publication date
CN111052442A (zh) 2020-04-21
JPWO2019130502A1 (ja) 2020-08-20
JP6862577B2 (ja) 2021-04-21
CN111052442B (zh) 2022-06-28

Similar Documents

Publication Publication Date Title
JPWO2016204147A1 (ja) 電池及び電池パック
WO2021049032A1 (fr) Batterie, bloc-batterie et véhicule
JP6972164B2 (ja) 電池及び電池パック
JP2009021133A (ja) 非水電解質二次電池
JP7024076B2 (ja) 接続部材及び電池パック
JP6989706B2 (ja) 二次電池及び電池パック
WO2019130502A1 (fr) Procédé de fabrication de batterie secondaire
JP6856775B2 (ja) 二次電池及び二次電池の再生方法
JP6951608B2 (ja) 拘束冶具及び電池の製造方法
JP7242396B2 (ja) 電池モジュール
JP7024075B2 (ja) 二次電池及び電池パック
WO2020026343A1 (fr) Accumulateur
JP7135219B2 (ja) 絶縁部材、電池、電池パック、車両及び電池の製造方法
JP3541770B2 (ja) 非水電解質二次電池
US12100798B2 (en) Constraint jig and manufacturing method of battery
WO2021033264A1 (fr) Batterie et bloc-batterie
WO2019234834A1 (fr) Structure de connexion et batterie assemblée
JP2020107409A (ja) 電池、電池アセンブリ、及び、電池モジュール

Legal Events

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

Ref document number: 17936121

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019561492

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17936121

Country of ref document: EP

Kind code of ref document: A1