WO2019187024A1 - Batterie et bloc-batterie - Google Patents

Batterie et bloc-batterie Download PDF

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Publication number
WO2019187024A1
WO2019187024A1 PCT/JP2018/013669 JP2018013669W WO2019187024A1 WO 2019187024 A1 WO2019187024 A1 WO 2019187024A1 JP 2018013669 W JP2018013669 W JP 2018013669W WO 2019187024 A1 WO2019187024 A1 WO 2019187024A1
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WO
WIPO (PCT)
Prior art keywords
exterior
battery
terminal
negative electrode
positive electrode
Prior art date
Application number
PCT/JP2018/013669
Other languages
English (en)
Japanese (ja)
Inventor
直樹 岩村
橋本　達也
博清 間明田
竹下　功一
元気 山岸
松井　勉
Original Assignee
株式会社 東芝
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 filed Critical 株式会社 東芝
Priority to PCT/JP2018/013669 priority Critical patent/WO2019187024A1/fr
Publication of WO2019187024A1 publication Critical patent/WO2019187024A1/fr

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • Embodiments of the present invention relate to a battery and a battery pack.
  • Batteries such as a primary battery and a secondary battery generally include an electrode group including a positive electrode and a negative electrode, and an exterior member that houses the electrode group.
  • a terminal of a certain battery and a terminal of another battery adjacent to the battery may be connected by a bus bar or the like.
  • a bus bar or the like In this case, for example, it is necessary to connect across the flange portion of the exterior member, and the connection distance between the batteries is relatively long. A long connection distance between adjacent batteries is not preferable because the electric resistance is high.
  • the problem to be solved by the present invention is to provide a battery capable of reducing the electric resistance when a plurality of batteries are connected, and a battery pack including the battery.
  • a battery including a flat electrode group, an exterior member including two exterior parts, and two terminal parts.
  • the electrode group includes a positive electrode, a positive electrode current collecting tab electrically connected to the positive electrode, a negative electrode, and a negative electrode current collecting tab electrically connected to the negative electrode.
  • the positive electrode current collection tab wound by the flat shape is located in a 1st end surface.
  • the negative electrode current collection tab wound by the flat shape is located in a 2nd end surface.
  • Each of the two exterior parts has a bottom part and a side wall. The two exterior portions are welded together, and the electrode group is accommodated in a storage space defined by the bottom and side walls of one exterior portion and the bottom and side walls of the other exterior portion.
  • the two terminal parts are respectively provided on the side wall of one exterior part and the side wall of the other exterior part.
  • a battery pack including the battery according to the first embodiment is provided.
  • FIG. 1 is a perspective view schematically showing an example of a battery according to an embodiment.
  • the perspective view which shows roughly the case where the battery shown in FIG. 1 is observed from another direction.
  • FIG. 2 is a side view schematically showing the battery shown in FIG. 1.
  • the disassembled perspective view of the battery shown in FIG. The perspective view of the electrode group with which the battery shown in FIG. 1 is provided.
  • the perspective view which shows the state which expand
  • the exploded view which shows the terminal part with which the battery shown in FIG. 1 is provided.
  • the perspective view which shows schematically the external terminal with which the battery shown in FIG. 1 is provided.
  • the perspective view which shows the other example of the terminal part with which the battery which concerns on embodiment is provided.
  • FIG. 12 is a sectional view taken along line XII-XII of the terminal portion shown in FIG.
  • FIG. 12 is a cross-sectional view taken along line XIII-XIII of the terminal portion shown in FIG.
  • the perspective view which shows the other example of the terminal part with which the battery which concerns on embodiment is provided.
  • the perspective view which shows the other example of the battery which concerns on embodiment roughly.
  • FIG. 16 is a side view schematically showing the battery shown in FIG. 15.
  • the perspective view which shows schematically the 1st exterior part with which the battery shown in FIG. 15 is provided.
  • FIG. 20 is a side view schematically showing the battery shown in FIG. 19.
  • the perspective view which shows schematically the 1st exterior part with which the battery shown in FIG. 19 is provided.
  • the perspective view which shows what the terminal part was fixed to the 1st exterior part with which the battery shown in FIG. 1 is provided.
  • the battery 100 shown in FIGS. 1 to 4 is a nonaqueous electrolyte battery.
  • the battery 100 includes an exterior member 1, an electrode group 2, a positive electrode terminal portion 3, a negative electrode terminal portion 4, and a nonaqueous electrolyte (not shown).
  • the exterior member 1 includes a first exterior part 5 and a second exterior part 6.
  • FIG. 1 is a perspective view showing a case where the battery 100 is seen from above (second exterior part 6 side).
  • FIG. 2 is a perspective view illustrating a case where the battery 100 is viewed from below (from the first exterior portion 5 side).
  • FIG. 3 is a side view showing a case where the battery 100 is observed from the side.
  • FIG. 4 is an exploded perspective view of the battery 100 shown in FIGS.
  • the 1st exterior part 5 is a square tube container with a bottom, and has the flange part 5b in the opening end 5a.
  • the second exterior part 6 has the same shape as the first exterior part 5. That is, the 2nd exterior part 6 is a square tube container with a bottom, and has the flange part 6b in the opening end 6a.
  • the first exterior part 5 has a bottom part 5c and four side walls 5e.
  • the four side walls 5e include a pair of short side walls facing each other and a pair of long side walls extending from both ends of the two short side walls.
  • the 2nd exterior part 6 has a bottom part and four side walls.
  • the four side walls include a pair of short side walls facing each other and a pair of long side walls extending from both ends of the two short side walls.
  • the exterior member 1 has a flange portion 1 b formed by welding the flange portion 5 b of the first exterior portion 5 and the flange portion 6 b of the second exterior portion 6.
  • the first exterior part 5 and the second exterior part 6 (two exterior parts) preferably have the same shape, but may have different shapes. In all drawings, the case where the 1st exterior part 5 and the 2nd exterior part 6 are mutually the same shape is shown. Therefore, unless otherwise specified, the description relating to the first exterior portion 5 also applies to the second exterior portion 6. Matters common to the two exterior portions may be simply referred to as “exterior portions”.
  • the exterior member 1 may be a substantially rectangular parallelepiped. 1 to 3, the X axis is a direction parallel to the short side and the bottom of the exterior member 1.
  • the Y axis is a direction parallel to the bottom of the exterior member 1 and perpendicular to the X axis.
  • the Z axis is a direction orthogonal to the X axis and the Y axis.
  • the Z-axis indicates the height direction of the side wall of the exterior member 1.
  • the battery 100 includes two terminal portions. On one short side A constituting the bottom surface 1c of the exterior member 1, a concave portion 5d having an inclined surface is provided, and the positive electrode terminal portion 3 is disposed on the inclined surface 5d.
  • the position of the positive electrode terminal portion 3 is not limited to this position, and may be provided on any side wall of the exterior member that is a substantially rectangular parallelepiped. That is, the positive electrode terminal portion 3 may be provided on the side wall on the short side or may be provided on the side wall on the long side. As will be described later, the positive electrode terminal portion 3 includes a positive electrode external terminal 17 provided on the inclined surface 5d.
  • a concave portion 6d having an inclined surface is provided on one short side B constituting the upper surface 1e of the exterior member 1, and the negative electrode terminal portion 4 is disposed on the inclined surface 6d.
  • the position of the negative electrode terminal portion 4 is not limited to this position, and may be provided on any one of the side walls in the exterior member that is a substantially rectangular parallelepiped. That is, the negative electrode terminal portion 4 may be provided on the side wall on the short side or may be provided on the side wall on the long side.
  • the negative electrode terminal portion 4 is preferably provided on the side wall opposite to the side wall on which the positive electrode terminal portion 3 is provided. As will be described later, the negative electrode terminal portion 4 includes a negative electrode external terminal 32 provided on the inclined surface 6d.
  • the short side A and the short side B do not constitute the same surface.
  • the short side A is contained in four sides which comprise one side surface among the two opposite side surfaces of the exterior member 1, and four sides which comprise the other side surface.
  • a short side B is included in four sides which comprise one side surface among the two opposite side surfaces of the exterior member 1, and four sides which comprise the other side surface.
  • the exterior member 1 is a substantially rectangular parallelepiped, for example, a terminal portion is provided on each of a pair of side walls facing each other.
  • the lengths of the four sides constituting the bottom surface of the exterior member 1 may all be the same.
  • Each of the two exterior parts has a depth equal to or smaller than the size of the opening end 5a (the maximum length of the part that becomes the opening area).
  • Each of the two exterior portions preferably has a depth equal to or shorter than the short side of the portion serving as the opening area (for example, one shown in FIG. 4).
  • the exterior member 1 stores the electrode group 2 in a storage space defined by the bottom and side walls of the first exterior part 5 and the bottom and side walls of the second exterior part 6.
  • the exterior member 1 is formed by welding the flange portion 5 b of the first exterior portion 5 to the four sides of the flange portion 6 b of the second exterior portion 6.
  • the 1st exterior part 5 consists of stainless steel substantially, for example, or consists of nickel plating steel substantially.
  • the 1st exterior part 5 is produced by shallow drawing, for example from a stainless steel plate.
  • resistance seam welding is used for welding the flange portion 5b of the first exterior portion 5 and the flange portion 6b of the second exterior portion 6. Resistance seam welding can achieve high hermeticity and heat resistance at a lower cost than laser welding.
  • the point-symmetrical exterior member 1 can be obtained by overlapping these flange parts and welding them together.
  • the shape of the exterior member 1 is preferably an axisymmetric shape. Examples of the axisymmetric shape include a rectangular parallelepiped and a cube.
  • the shape of the exterior member 1 is a rectangular parallelepiped or a cube, an extra space is unlikely to be generated when an assembled battery in which a plurality of these are connected is produced. In this case, since the volume of the assembled battery occupying the space per unit volume can be increased, the volume energy density can be improved.
  • the axis of symmetry of the axisymmetric shape will be described in more detail with reference to FIG.
  • the symmetry axis of the axially symmetric shape is parallel to the two opposing side walls 53 and 54 provided with the terminal portions, and among the innumerable straight lines parallel to the bottom of the exterior member, the corner portion 55 and the corner of the exterior member 1 are included. A straight line intersecting with the midpoint of the diagonal line connecting the portions 56 is indicated.
  • the exterior member 1 has an axisymmetric shape, the positive electrode terminal portion 3 and the negative electrode terminal portion 4 are arranged so that the straight line connecting the positive electrode terminal portion 3 and the negative electrode terminal portion 4 is orthogonal to the axial symmetry axis. Can be provided.
  • the exterior member 1 is a substantially rectangular parallelepiped, ie, an axisymmetric shape.
  • FIG. 7 is a schematic sectional view taken along line VII-VII of the battery 100 shown in FIG.
  • a concave portion projecting inward is provided near the center of the corner connecting the short side wall and the bottom portion of the first exterior portion 5, and the bottom portion of the concave portion becomes an inclined surface 5 d.
  • a concave portion projecting inward is provided near the center of the corner connecting the short side wall and the bottom portion of the second exterior portion 6, and the bottom portion of the concave portion is an inclined surface 6d.
  • the electrode group 2 has a flat shape, and includes a positive electrode 7, a negative electrode 8, and a separator 9 disposed between the positive electrode 7 and the negative electrode 8.
  • the positive electrode 7 includes a strip-shaped positive electrode collector made of, for example, a foil, a positive electrode current collector tab 7a having one end parallel to the long side of the positive electrode current collector, and at least the positive electrode current collector tab 7a. And a positive electrode material layer (positive electrode active material-containing layer) 7b formed on the electric body.
  • the negative electrode 8 is formed by removing, for example, a strip-shaped negative electrode current collector made of foil, a negative electrode current collector tab 8a formed of one end parallel to the long side of the negative electrode current collector, and at least a portion of the negative electrode current collector tab 8a. And a negative electrode material layer (negative electrode active material-containing layer) 8b formed on the negative electrode current collector.
  • the positive electrode material layer 7 b of the positive electrode 7 and the negative electrode material layer 8 b of the negative electrode 8 are opposed to each other through the separator 9, and the positive electrode current collecting tab 7 a is disposed on one side of the winding shaft more than the negative electrode 8 and the separator 9.
  • the positive electrode 7, the separator 9, and the negative electrode 8 are wound in a flat shape so that the negative electrode current collecting tab 8a protrudes from the positive electrode 7 and the separator 9 on the other side. Therefore, in the electrode group 2, the positive electrode current collecting tab 7a wound in a flat spiral shape is located on the first end surface perpendicular to the winding axis. Moreover, the negative electrode current collection tab 8a wound by the flat spiral shape is located in the 2nd end surface perpendicular
  • the insulating sheet 10 covers a portion of the outermost periphery of the electrode group 2 excluding the positive electrode current collecting tab 7 a and the negative electrode current collecting tab 8 a.
  • the electrode group 2 holds a nonaqueous electrolyte (not shown).
  • the backup positive electrode lead 11 (third positive electrode lead) is a conductive plate bent in a U shape, and a portion (center) excluding the curved portions at both ends of the positive electrode current collecting tab 7a.
  • the layers of the positive electrode current collecting tab 7a are in close contact with each other in the vicinity.
  • the electrode group side positive lead 12 (second positive lead) is a conductive plate having a larger area than the backup positive lead 11.
  • the electrode group side positive lead 12 is connected to the surface of the backup positive lead 11 on the opening end side of the first exterior portion 5.
  • the positive electrode current collecting tab 7a, the backup positive electrode lead 11, and the electrode group side positive electrode lead 12 are integrated by bonding. Accordingly, the positive electrode 7 is electrically connected to the electrode group side positive electrode lead 12 via the positive electrode current collecting tab 7 a and the backup positive electrode lead 11.
  • the joining is performed by, for example, ultrasonic joining.
  • the backup negative electrode lead 13 (third negative electrode lead) is obtained by bending a conductive plate into a U shape, and excludes the curved portions at both ends of the negative electrode current collecting tab 8a (center). The layers of the negative electrode current collecting tab 8a are in close contact with each other in the vicinity.
  • the electrode group side negative electrode lead 14 (second negative electrode lead) is a conductive plate having a larger area than the backup negative electrode lead 13. The electrode group side negative electrode lead 14 is connected to the surface of the backup negative electrode lead 13 on the opening end side of the first exterior part 5.
  • the negative electrode current collecting tab 8a, the backup negative electrode lead 13 and the electrode group side negative electrode lead 14 are integrated by bonding, whereby the negative electrode 8 is connected to the electrode group side negative electrode lead 14 via the negative electrode current collecting tab 8a and the backup negative electrode lead 13. Electrically connected.
  • the joining is performed by, for example, ultrasonic joining.
  • the backup positive electrode lead 11 (third positive electrode lead) and the backup negative electrode lead 13 (third negative electrode lead) are not limited to U-shaped conductive plates, and conductive flat plates may be used. It is also possible to employ a configuration in which one or both of the backup positive electrode lead 11 and the backup negative electrode lead 13 are not used.
  • the positive electrode terminal portion 3 includes a through hole (first through hole) 15 opened in the inclined surface 5 d of the first exterior portion 5, and a burring portion (first Burring portion) 16, a positive external terminal 17, a ring-shaped member (first ring-shaped member) 18, an insulating gasket (first insulating gasket) 19, and a positive terminal insulating member (third positive insulating member). ) 20.
  • the ring-shaped member 18 and the third positive terminal insulating member 20 can be omitted.
  • the burring portion (annular rising portion) 16 extends from the peripheral portion of the through hole 15 into the exterior member 1 and is formed by burring.
  • the positive external terminal 17 includes a truncated pyramidal head 21 and a cylindrical shaft 22 as shown in FIG.
  • the head 21 has two cone surfaces 21a and 21b (first and second inclined surfaces) and a rectangular top surface 21c connecting the two cone surfaces 21a and 21b.
  • the columnar shaft portion 22 extends in a direction orthogonal to a plane parallel to the top surface 21 c of the head portion 21.
  • the positive external terminal 17 is made of a conductive material such as aluminum or aluminum alloy, for example.
  • the ring-shaped member 18 is made of, for example, a circular ring made of a material having rigidity higher than that of the gasket.
  • materials with higher rigidity than gaskets include stainless steel, iron plated (eg, Ni, NiCr, etc.), ceramics, resins with higher rigidity than gaskets (eg, polyphenylene sulfide (PPS), poly Butylene terephthalate (PBT)) and the like.
  • PPS polyphenylene sulfide
  • PBT poly Butylene terephthalate
  • the ring-shaped member 18 is disposed on the outer peripheral surface of the burring portion 16 and is in contact with the burring portion 16.
  • the ring-shaped member 18 when the ring-shaped member 18 is formed of an insulating material such as resin or ceramics, it can be integrated with the positive electrode insulating reinforcing member 24.
  • the insulating gasket 19 is a cylindrical body (tubular portion) having a flange portion 19a at one open end. As shown in FIGS. 7 and 8, the insulating gasket 19 has a cylindrical portion inserted into the through hole 15 and the burring portion 16, and a flange portion 19 a of the through hole 15 on the outer surface of the first exterior portion 5. It is arranged on the outer periphery.
  • the insulating gasket 19 is, for example, a resin such as fluororesin, fluororubber, polyphenylene sulfide resin (PPS resin), polyether ether ketone resin (PEEK resin), polypropylene resin (PP resin), and polybutylene terephthalate resin (PBT resin). Formed from.
  • the positive electrode terminal insulating member (third positive electrode insulating member) 20 is a rectangular tube with a bottom, and has a through hole 20a at the bottom.
  • the positive terminal insulating member 20 is disposed on the outer surface of the first exterior part 5.
  • the flange portion 19 a of the insulating gasket 19 is inserted into the through hole 20 a of the positive terminal insulating member 20.
  • the positive terminal portion 3 can further include a positive terminal lead 23 (first positive lead). As shown in FIGS. 4 and 8, the positive terminal lead 23 is a conductive plate having a through hole 23a.
  • the positive electrode terminal portion 3 can further include a positive electrode insulation reinforcing member 24 (first positive electrode insulation member).
  • the positive electrode insulation reinforcing member 24 includes a main body portion 24a having a structure in which a bottomed rectangular tube is divided in the long side direction, and a circular groove 24b (shown in FIG. 8) formed in the main body portion 24a. And a through hole 24c opened in the center of the circular groove 24b.
  • the positive electrode external terminal 17 is electrically connected to the positive electrode current collecting tab 7a through the first positive electrode lead 23, the second positive electrode lead 12, and the third positive electrode lead 11, for example.
  • the positive electrode insulation reinforcing member 24 has a corner portion where the main body portion 24 a is connected to the bottom surface from the short side wall of the first exterior portion 5, and a long side from the short side wall of the first exterior portion 5. Covers the corner connected to the side surface. Thereby, the 1st exterior part 5, especially the corner vicinity where a short side wall, a long side wall, and a bottom part can be reinforced.
  • the ring-shaped member 18 disposed on the outer peripheral surface of the burring portion 16 is disposed in the circular groove 24b.
  • the through hole 24 c communicates with the opening of the burring portion 16 and the through hole 15 of the first exterior portion 5.
  • a positive terminal lead 23 is disposed on the positive insulating reinforcement member 24.
  • the through hole 23 a of the positive terminal lead 23 communicates with the through hole 24 c of the positive electrode insulation reinforcing member 24, the opening of the burring portion 16, and the through hole 15 of the first exterior portion 5.
  • the shaft portion 22 of the positive electrode external terminal 17 includes a through hole 20 a of the positive electrode terminal insulating member 20, an insulating gasket 19, a through hole 15 of the first exterior portion 5, a burring portion 16, and a ring-shaped member 18.
  • plastic deformation is caused by caulking.
  • these members are integrated, and the positive external terminal 17 is electrically connected to the positive terminal lead 23. Therefore, the positive external terminal 17 also serves as a rivet.
  • the boundary between the end face of the shaft portion 22 of the positive electrode external terminal 17 and the through hole 23a of the positive electrode terminal lead 23 may be welded with a laser or the like so as to be connected more firmly. Thereby, the electrical continuity between the positive external terminal 17 and the positive terminal lead 23 can be improved.
  • the negative electrode terminal portion 4 includes a through hole (second through hole) 30 opened in the inclined surface 6 d of the second exterior portion 6, a burring portion (second burring portion) 31, and , Negative electrode external terminal 32, ring-shaped member 33 (second ring-shaped member), insulating gasket (second insulating gasket) 34, and negative-electrode terminal insulating member (third negative electrode insulating member) 35.
  • Each of these members has the same structure as each member described for the positive electrode terminal portion 3.
  • the negative electrode terminal portion 4 can further include a negative electrode terminal lead 36 (first negative electrode lead).
  • the negative terminal lead 36 is a conductive plate having a through hole 36a.
  • the negative electrode terminal portion 4 can further include a negative electrode insulation reinforcing member 37 (first negative electrode insulation member).
  • the negative electrode terminal insulation reinforcing member 37 includes a main body portion 37a having a structure in which a bottomed rectangular tube is divided in the long side direction, a circular groove 37b formed in the main body portion 37a, and a circular groove 37b. And a through hole 37c opened in the center.
  • the negative electrode external terminal 32 is electrically connected to the negative electrode current collecting tab 8a through the first negative electrode lead 36, the second negative electrode lead 14, and the third negative electrode lead 13, for example.
  • the negative electrode insulation reinforcing member 37 includes a corner portion where the main body portion 37a is connected to the bottom surface from the short side wall of the second exterior portion 6 and a corner portion where the short side wall of the second exterior portion 6 is connected to the long side wall. Coating. Thereby, the 2nd exterior part 6, especially the corner vicinity where a short side wall, a long side wall, and a bottom part can be reinforced.
  • the ring-shaped member 33 disposed on the outer peripheral surface of the burring portion 31 is disposed in the circular groove 37b.
  • the through hole 37 c communicates with the opening of the burring portion 31 and the through hole 30 of the second exterior portion 6.
  • a negative terminal lead 36 is disposed on the negative terminal insulating reinforcing member 37.
  • the through hole 36 a of the negative electrode terminal lead 36 communicates with the through hole 37 c of the negative electrode terminal insulating reinforcing member 37, the opening of the burring portion 31, and the through hole 30 of the second exterior portion 6.
  • the shaft portion of the negative electrode external terminal 32 includes an insulating gasket 34, a through hole 35 a of the negative electrode terminal insulating member 35, a through hole 30 of the second exterior portion 6, a burring portion 31, a ring-shaped member 33, and a negative electrode terminal insulating reinforcing member 37.
  • plastic deformation is caused by caulking.
  • these members are integrated and the negative electrode external terminal 32 is electrically connected to the negative electrode terminal lead 36. Therefore, the negative external terminal 36 also serves as a rivet.
  • the boundary portion between the end surface of the shaft portion of the negative electrode external terminal 32 and the through hole 36a of the negative electrode terminal lead 36 may be welded with a laser or the like to be connected more firmly. Thereby, the electrical continuity between the negative external terminal 32 and the negative terminal lead 36 can be improved.
  • the battery 100 may include at least one second insulation reinforcing member 38 inside the exterior member 1.
  • the second insulation reinforcing member 38 has a structure in which a bottomed rectangular tube is divided in half in the long side direction.
  • the second insulation reinforcing member 38a (fourth negative electrode insulating member) connects the short side wall and the bottom on the short side of the first exterior portion 5 that faces the short side where the positive electrode terminal portion 3 is provided. It is provided so as to cover the corner portion.
  • the second insulation reinforcing member 38b (fourth positive electrode insulating member) has a short side wall and a bottom portion on the short side of the second exterior portion 6 that faces the short side where the negative electrode terminal portion 4 is provided. It is provided so that the corner part which connects may be covered.
  • the second insulation reinforcing member 38 a provided so as to be in contact with the first exterior portion 5 covers about half of the negative electrode current collecting tab 8 a from the winding center to the bottom of the first exterior portion 5. Thereby, in the 1st exterior part 5, the short side vicinity which opposes the short side in which the positive electrode terminal part 3 was provided can be reinforced.
  • the second insulation reinforcing member 38 b provided so as to be in contact with the second exterior portion 6 covers about half of the positive electrode current collecting tab 7 a from the winding center to the bottom of the second exterior portion 6. Thereby, in the 2nd exterior part 6, the short side vicinity which opposes the short side in which the negative electrode terminal part 4 was provided can be reinforced.
  • the first to third positive electrode leads and negative electrode leads can be formed from, for example, aluminum or an aluminum alloy material.
  • the material of the lead is preferably the same as the material of the positive electrode current collector or the negative electrode current collector that can be electrically connected to the lead.
  • First to fourth positive electrode insulating members and negative electrode insulating members for example, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), polypropylene (PP), polyethylene (PE), nylon, polybutylene terephthalate (PBT) , Polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), and polyether ether ketone (PEEK).
  • PFA tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer
  • PP polypropylene
  • PE polyethylene
  • nylon polybutylene terephthalate
  • PBT polybutylene terephthalate
  • PET Polyethylene terephthalate
  • PTFE polytetrafluoroethylene
  • PPS polyphenylene sulfide
  • PEEK polyether ether ketone
  • the electrode group 2 is housed in the first exterior part 5 so that the first end face 7 a faces the positive terminal part 3 and the second end face 8 a faces the negative terminal part 4. Therefore, the plane intersecting the first end surface 7a and the second end surface 8a of the electrode group 2 faces the bottom surface 5c in the first exterior portion 5, and the curved surface intersecting the first end surface 7a and the second end surface 8a is the first. It faces the long side surface in the exterior part 5. Further, the plane intersecting the first end surface 7a and the second end surface 8a of the electrode group 2 faces the bottom surface in the second exterior portion 6, and the curved surface intersecting the first end surface 7a and the second end surface 8a is the second exterior. It faces the long side surface in the portion 6.
  • the installation area of the terminal portion is larger than when the positive electrode terminal portion 3 or the negative electrode terminal portion 4 is provided on the short side surface having no inclined surface. Can be increased. Therefore, the diameter of the shaft portion 22 of the positive electrode external terminal 17 and the diameter of the shaft portion of the negative electrode external terminal 32 can be increased, so that a large current (high rate current) can flow with low resistance.
  • the lower end of the second insulation reinforcing member 38 b is the upper end of the first positive electrode insulation member 24.
  • the positive electrode current collecting tab 7a is covered with a bottomed rectangular cylindrical insulating cover formed by contacting with the electrode.
  • the negative electrode current collecting tab 8 a is covered with a bottomed rectangular cylindrical insulating cover formed by contacting the upper end of the second insulating reinforcing member 38 a with the lower end of the first negative electrode insulating member 37.
  • the electrode group 2 is sealed in the exterior member 1 by welding the four sides of the flange portion 5b included in the first exterior portion 5 and the four sides of the flange portion 6b included in the second exterior portion 6.
  • the battery described above includes an exterior member capable of accommodating an electrode group in a space formed by welding two exterior portions having a flange portion at an open end.
  • the two exterior parts are made of stainless steel, high strength can be maintained even when the thickness of the exterior part is reduced.
  • the flexibility of the exterior member can be increased, the electrode group can be easily restrained by applying a load from the outside of the reduced pressure seal or the exterior member. Thereby, the distance between the electrodes of the electrode group can be stabilized and the resistance can be lowered, and the battery pack having vibration resistance and impact resistance can be easily realized.
  • the flexibility of the exterior part is high, it is easy to reduce the distance from the inner surface of the exterior part to the electrode group, and thus the heat dissipation of the battery can be improved.
  • Stainless steel exterior parts are easy to weld and can be sealed by inexpensive resistance seam welding. Therefore, it is possible to realize an exterior member having a higher gas sealing property than a laminate film container at a low cost. Moreover, the heat resistance of the exterior member can be improved.
  • SUS304 has a melting point of 1400 ° C.
  • Al has a melting point of 650 ° C.
  • the shaft portion of the external terminal is plastically deformed as a result of being caulked and fixed to the through hole. As a result, a force is applied in the radial direction of the insulating gasket.
  • the terminal portion is provided with a ring-shaped member
  • the rising portion is reinforced by the ring-shaped member arranged on the outside thereof, so that compressive stress is generated in the insulating gasket, and the external terminal has a high strength on the exterior portion. Can be connected. Even if the plate thickness of the exterior part, that is, the plate thickness of the rising part is reduced, the rising part can be reinforced with the ring-shaped member. Can be connected.
  • the rising portion extends from the edge of the through hole into the exterior member, it is possible to suppress liquid leakage when the internal pressure of the exterior member increases due to gas generation or the like by the action of the external pressure. . Therefore, high reliability can be realized even when the plate thickness of the exterior portion is reduced.
  • the open end areas of these external parts become large.
  • the opening end area of the two exterior parts is large, when welding the two exterior parts with their four sides, the length of one side to be welded becomes longer, so the three sides are welded first and the remaining one side It becomes easy to inject the electrolyte from the gap.
  • the exterior member can be temporarily sealed by providing a location where the welding strength is lower than others. Therefore, if the two exterior parts have a depth equal to or less than the maximum length of the open end, a part for temporary sealing (for example, a rubber plug) can be made unnecessary. Furthermore, since the exterior member has a flat shape, the heat dissipation of the battery can be improved.
  • the first exterior part and / or the second exterior part includes a concave part having an inclined surface at the corner part where the side wall and the bottom part on the short side or the long side intersect, and the terminal part is arranged on the inclined surface.
  • the dead space in the exterior portion can be reduced, and an external terminal having a thick shaft portion can be used. Therefore, a large current (high rate current) can be flowed with a low resistance.
  • the inclined portion is not limited to the one provided near the center of the side of the exterior member, and may extend over the entire side of the exterior member.
  • the plate thickness of the first exterior part and / or the second exterior part is preferably in the range of 0.02 mm to 0.3 mm. By setting it within this range, the conflicting properties of mechanical strength and flexibility can be achieved. A more preferable range of the plate thickness is 0.05 mm or more and 0.15 mm or less.
  • the difference (wall thickness) between the outer and inner diameters of the positive electrode terminal portion, the negative electrode terminal portion, or both ring-shaped members is preferably equal to or greater than the plate thickness of the exterior portion.
  • the shortest thickness can be 0.1 mm or more.
  • the outer shape of the ring-shaped member is not necessarily the same shape as the burring cross-sectional shape, and may be a polyhedron such as a rectangle or a hexagon, or may be a composite shape of a single or a plurality of curves and a single or a plurality of straight lines.
  • the exterior member can further include a safety valve or the like that can release the pressure inside the battery when the internal pressure of the battery rises above a specified value.
  • 10 to 14 are diagrams showing modifications of the above-described positive electrode terminal portion and / or negative electrode terminal portion.
  • 10 and 11 are examples in which the shape of the head is a quadrangular frustum shape (pyramid shape).
  • 12 is a schematic cross-sectional view taken along line XII-XII of the terminal portion shown in FIG.
  • FIG. 13 is a schematic sectional view taken along line XIII-XIII of the terminal portion shown in FIG.
  • the head portion 117 of the positive electrode terminal part and / or the negative electrode terminal part has a quadrangular frustum shape (pyramid shape). That is, the top surface 117a of the head 117 is a rectangular plane.
  • the four side surfaces 117b, 117c, 117d, and 117e are conical surfaces, and are inclined so that the cross-sectional area of the head increases toward the bottom.
  • the four side surfaces 117b, 117c, 117d, and 117e function as tapered portions.
  • the terminal part can be provided with a bus bar 300.
  • the bus bar 300 rises from the flat plate-like first connection portion 301 and one side of the first connection portion 301 at an angle similar to the inclination angle of the inclined surface 5d.
  • the second connecting portion 302 is bent along the short side surface of one exterior portion 5, and the rectangular cutout portion 303 is provided near the center of the long side of the second connecting portion 302.
  • the three end faces of the notch 303 have a tapered shape that is inclined so that the opening area increases toward the lower side (insulating plate 116 side).
  • the tapered shapes of the three end surfaces of the notch 303 correspond to the shapes of the tapered portions 117b, 117c, 117d, and 117e of the head 117.
  • the notch 303 of the bus bar 300 is inserted into the tapered portions 117b, 117c, and 117d of the head 117, and the notch 303 is fitted into the tapered portions 117b, 117c, and 117d as shown in FIGS.
  • the portions where the tapered portions 117b, 117c, and 117d are in contact with the end surfaces of the cutout portions 303 are joined by, for example, welding, whereby the positive electrode external terminal and / or the negative electrode external terminal and the bus bar are electrically connected. Examples of the welding method include laser welding, resistance welding, and ultrasonic bonding.
  • the 1st connection part 301 can be used in order to make it electrically connect with another battery etc.
  • the first insulating member 116 is disposed between the inclined surface 5d of the first exterior portion 5 and the lower surface of the head portion 117 to insulate them.
  • FIG. 14 shows an example in which the shape of the head is a truncated cone.
  • the head part 217 of the positive electrode terminal part and / or the negative electrode terminal part has a truncated cone shape. That is, the top surface 217a of the head 217 is a circular plane.
  • the side peripheral surface 217b is a conical surface, and is inclined so that the cross-sectional area of the head increases as it goes downward.
  • the side peripheral surface 217b functions as a tapered portion.
  • the bus bar 500 rises from a flat plate-like first connection portion 501 and one side of the first connection portion 501 at an angle similar to the inclination angle of the inclined surface 5 d, and the first exterior It has the 2nd connection part 502 bent so that the short side surface of the part 5 may be followed, and the circular through-hole 503 provided in the 2nd connection part 502.
  • FIG. The inner peripheral surface of the through-hole 503 has a tapered shape that is inclined so that the opening area increases toward the lower side (the insulating plate 116 side).
  • the taper shape of the inner peripheral surface of the through hole 503 corresponds to the shape of the taper portion 217b of the head 217.
  • the through hole 503 of the bus bar 500 is inserted into the tapered portion 217b of the head 217, and the through hole 503 is fitted into the tapered portion 217b as shown in FIG.
  • the portion where the tapered portion 217b and the inner peripheral surface of the through hole 503 are in contact is joined by, for example, welding, and thereby the positive external terminal and / or the negative external terminal and the bus bar are electrically connected. Examples of the welding method include laser welding, resistance welding, and ultrasonic bonding.
  • the first connection portion 501 can be used for electrical connection with another battery or the like.
  • the first insulating member 116 is disposed between the inclined surface 5d of the first exterior portion 5 and the lower surface of the head portion 217 to insulate them.
  • FIG. 15 is a perspective view showing a case where a battery 150 according to another embodiment is seen from above (second exterior part 6 side).
  • FIG. 16 is a perspective view showing a case where a battery 150 according to another embodiment is viewed from below (first exterior portion 5 side).
  • FIG. 17 is a side view showing a case where a battery 150 according to another embodiment is observed from the side.
  • Battery 150 is a battery having the same configuration as battery 100 shown in FIG. 1 except that the position of flange portion 1b of exterior member 1 is different.
  • the first exterior part 5 included in the battery 150 includes a bottom part and three side walls. These bottom part and three side walls define a part of the storage space for storing the electrode group 2 (not shown).
  • the second exterior part 6 included in the battery 150 has the same shape as that of the first exterior part 5. That is, the second exterior part 6 includes a bottom part and three side walls. These bottom and three side walls define the other part of the storage space.
  • the first exterior part 5 includes a rectangular bottom 69, a short side wall 70, and two long side walls 71 and 72.
  • the flange 5b is provided at the end of the short side wall 70, the end of the short side without the side wall facing the short side wall 70, and the end of the two long side walls 71 and 72. ing.
  • the two long side walls 71 and 72 extend from the short side wall 70, and the height of the side walls 71 and 72 decreases in the direction in which they extend.
  • the terminal portion (positive electrode terminal portion 3) is provided, for example, at a corner portion where the bottom portion 69 and the short side wall 70 intersect.
  • the terminal portion may be provided at a corner portion where the bottom portion 69 and the long side wall 71 or 72 intersect.
  • the second exterior part 6 also has the same shape as the first exterior part 5.
  • the exterior member 1 is formed by combining the short-side side walls and the long-side side walls of the two exterior portions, and welding the flange portions to each other.
  • the height of the short side wall 70 is the height of the exterior member 1 or the height of the battery 150.
  • the shape of the battery exterior member 1 according to the embodiment may be the shape shown in FIGS.
  • FIG. 19 is a perspective view showing a case where a battery 160 according to another embodiment is seen from above (second exterior part 6 side).
  • FIG. 20 is a perspective view showing a case where a battery 160 according to another embodiment is viewed from below (first exterior part 5 side).
  • FIG. 21 is a side view showing a case where a battery 160 according to another embodiment is observed from the side.
  • the battery 160 is a battery having the same configuration as the battery 100 shown in FIG. 1 except that the position of the flange portion 1b of the exterior member 1 is different.
  • the first exterior part 5 included in the battery 160 includes a bottom part and four side walls. These bottom part and four side walls define a part of the storage space for storing the electrode group 2 (not shown).
  • the second exterior part 6 included in the battery 160 has the same shape as that of the first exterior part 5. That is, the second exterior part 6 includes a bottom part and four side walls. These bottom and four side walls define the other part of the storage space.
  • the first exterior part 5 includes a rectangular bottom 69, two side walls 73 and 74 on the short side, and two side walls 75 and 76 on the long side.
  • Flange portions 5b are provided at the ends of the two side walls 73 and 74 on the short side and the ends of the two side walls 71 and 72 on the long side.
  • the short side wall 73 has a higher height than the short side wall 74 opposed thereto.
  • the length of the two side walls 75 and 76 on the long side decreases from the portion intersecting with the short side wall 73 toward the portion intersecting with the short side wall 74.
  • the terminal portion (positive electrode terminal portion 3) is provided, for example, at a corner portion where the bottom portion 69 and the short side wall 73 intersect.
  • the terminal portion may be provided at a corner portion where the bottom portion 69 and the short side wall 74 intersect.
  • the terminal portion may be provided at a corner portion where the bottom portion 69 and the long side wall 75 or 76 intersect.
  • the second exterior part 6 also has the same shape as the first exterior part 5.
  • the exterior member 1 is formed by combining the short-side side walls and the long-side side walls of the two exterior portions, and welding the flange portions to each other.
  • the sum of the height of the short side wall 73 and the height of the short side wall 74 is the height of the exterior member 1 or the height of the battery 160.
  • the battery according to the first embodiment may be a primary battery or a secondary battery.
  • An example of the battery according to the first embodiment is a lithium ion secondary battery.
  • the positive electrode, negative electrode, separator, and nonaqueous electrolyte of the battery according to the first embodiment will be described below.
  • the positive electrode can include, for example, a positive electrode current collector, a positive electrode material layer held by the positive electrode current collector, and a positive electrode current collector tab.
  • the positive electrode material layer can include, for example, a positive electrode active material, a conductive agent, and a binder.
  • an oxide or a sulfide can be used as the positive electrode active material.
  • oxides and sulfides include manganese dioxide (MnO 2 ) that occludes lithium, iron oxide, copper oxide, nickel oxide, lithium manganese composite oxide (eg, Li x Mn 2 O 4 or Li x MnO 2 ), Lithium nickel composite oxide (for example, Li x NiO 2 ), lithium cobalt composite oxide (for example, Li x CoO 2 ), lithium nickel cobalt composite oxide (for example, LiNi 1-y Co y O 2 ), lithium manganese cobalt composite oxide (e.g.
  • Li x Mn y Co 1-y O 2 lithium manganese nickel complex oxide having a spinel structure (e.g., Li x Mn 2-y Ni y O 4), lithium phosphates having an olivine structure (e.g., Li x FePO 4, Li x Fe 1- y Mn y PO 4, Li x CoPO 4), iron sulfate (Fe 2 (SO 4) 3 ), vanadium oxides (e.g. Examples thereof include V 2 O 5 ) and lithium nickel cobalt manganese composite oxide.
  • these compounds may be used alone, or a plurality of compounds may be used in combination.
  • the binder is blended to bind the active material and the current collector.
  • the binder include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), and fluorine-based rubber.
  • the conductive agent is blended as necessary in order to enhance the current collecting performance and suppress the contact resistance between the active material and the current collector.
  • Examples of the conductive agent include carbonaceous materials such as acetylene black, carbon black, and graphite.
  • the positive electrode active material and the binder are preferably blended at a ratio of 80% by mass to 98% by mass and 2% by mass to 20% by mass, respectively.
  • a sufficient electrode strength can be obtained by setting the binder to an amount of 2% by mass or more. Moreover, the content of the insulating material of an electrode can be reduced by setting it as 20 mass% or less, and internal resistance can be reduced.
  • the positive electrode active material, the binder, and the conductive agent are 77% by mass or more and 95% by mass or less, 2% by mass or more and 20% by mass or less, and 3% by mass or more and 15% by mass or less, respectively. It is preferable to mix
  • the conductive agent can exhibit the above-described effects by adjusting the amount to 3% by mass or more. Moreover, by setting it as 15 mass% or less, decomposition
  • the positive electrode current collector is preferably an aluminum foil or an aluminum alloy foil containing at least one element selected from Mg, Ti, Zn, Ni, Cr, Mn, Fe, Cu and Si.
  • the positive electrode current collector is preferably integral with the positive electrode current collecting tab.
  • the positive electrode current collector may be a separate body from the positive electrode current collector tab.
  • Negative electrode A negative electrode can contain the negative electrode collector, the negative electrode material layer hold
  • the negative electrode material layer can include, for example, a negative electrode active material, a conductive agent, and a binder.
  • the negative electrode active material for example, a metal oxide, metal nitride, alloy, carbon, or the like that can occlude and release lithium ions can be used. It is preferable to use as the negative electrode active material a material capable of inserting and extracting lithium ions at a potential of 0.4 V or higher (vs. Li / Li + ).
  • the conductive agent is blended in order to enhance the current collecting performance and suppress the contact resistance between the negative electrode active material and the current collector.
  • Examples of the conductive agent include carbonaceous materials such as acetylene black, carbon black, and graphite.
  • the binder is blended to fill a gap between the dispersed negative electrode active materials and to bind the negative electrode active material and the current collector.
  • the binder include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), fluorine-based rubber, and styrene butadiene rubber.
  • the active material, the conductive agent, and the binder in the negative electrode material layer are blended at a ratio of 68% by mass to 96% by mass, 2% by mass to 30% by mass, and 2% by mass to 30% by mass, respectively. It is preferable.
  • the amount of the conductive agent By setting the amount of the conductive agent to 2% by mass or more, the current collecting performance of the negative electrode layer can be improved. Further, by setting the amount of the binder to 2% by mass or more, the binding property between the negative electrode material layer and the current collector can be sufficiently exhibited, and excellent cycle characteristics can be expected.
  • the conductive agent and the binder are each preferably 28% by mass or less in order to increase the capacity.
  • the current collector a material that is electrochemically stable at the lithium insertion / release potential of the negative electrode active material is used.
  • the current collector is preferably made of copper, nickel, stainless steel or aluminum or an aluminum alloy containing at least one element selected from Mg, Ti, Zn, Mn, Fe, Cu and Si.
  • the thickness of the current collector is preferably in the range of 5 to 20 ⁇ m. A current collector having such a thickness can balance the strength and weight reduction of the negative electrode.
  • the negative electrode current collector is preferably integral with the negative electrode current collecting tab.
  • the negative electrode current collector may be a separate body from the negative electrode current collection tab.
  • the negative electrode is prepared by suspending a negative electrode active material, a binder and a conductive agent in a commonly used solvent to prepare a slurry, and applying this slurry to a current collector and drying to form a negative electrode material layer It is produced by applying a press.
  • the negative electrode may also be produced by forming a negative electrode active material, a binder, and a conductive agent in the form of a pellet to form a negative electrode material layer, which is disposed on a current collector.
  • the separator may be formed of, for example, a porous film containing polyethylene, polypropylene, cellulose, or polyvinylidene fluoride (PVdF), or a synthetic resin nonwoven fabric.
  • a porous film formed from polyethylene or a polypropylene can melt
  • security can be improved.
  • Electrolytic Solution for example, a nonaqueous electrolyte can be used.
  • the non-aqueous electrolyte may be, for example, a liquid non-aqueous electrolyte prepared by dissolving an electrolyte in an organic solvent, or a gel non-aqueous electrolyte in which a liquid electrolyte and a polymer material are combined.
  • the liquid non-aqueous electrolyte is preferably obtained by dissolving the electrolyte in an organic solvent at a concentration of 0.5 mol / L or more and 2.5 mol / L or less.
  • Examples of the electrolyte dissolved in the organic solvent include lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), and lithium arsenic hexafluoride (LiAsF 6). ), Lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), and lithium salts such as lithium bistrifluoromethylsulfonylimide [LiN (CF 3 SO 2 ) 2 ], and mixtures thereof.
  • the electrolyte is preferably one that is difficult to oxidize even at a high potential, and LiPF 6 is most preferred.
  • organic solvents examples include cyclic carbonates such as propylene carbonate (PC), ethylene carbonate (EC), and vinylene carbonate; such as diethyl carbonate (DEC), dimethyl carbonate (DMC), and methyl ethyl carbonate (MEC).
  • Chain carbonates cyclic ethers such as tetrahydrofuran (THF), 2 methyltetrahydrofuran (2MeTHF), and dioxolane (DOX); chain ethers such as dimethoxyethane (DME) and diethoxyethane (DEE); ⁇ -butyrolactone (GBL), acetonitrile (AN), and sulfolane (SL) are included.
  • These organic solvents can be used alone or as a mixed solvent.
  • polymer material examples include polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), and polyethylene oxide (PEO).
  • PVdF polyvinylidene fluoride
  • PAN polyacrylonitrile
  • PEO polyethylene oxide
  • a room temperature molten salt (ionic melt) containing lithium ions a polymer solid electrolyte, an inorganic solid electrolyte, or the like may be used as the non-aqueous electrolyte.
  • Room temperature molten salt refers to a compound that can exist as a liquid at room temperature (15 to 25 ° C.) among organic salts composed of a combination of an organic cation and an anion.
  • the room temperature molten salt includes a room temperature molten salt that exists alone as a liquid, a room temperature molten salt that becomes liquid when mixed with an electrolyte, and a room temperature molten salt that becomes liquid when dissolved in an organic solvent.
  • the melting point of a room temperature molten salt used for a nonaqueous electrolyte battery is 25 ° C. or less.
  • the organic cation generally has a quaternary ammonium skeleton.
  • FIG. 24 shows a state where guide holes for positioning are formed in the exterior part.
  • FIG. 24 is a plan view showing an example of the first exterior portion 5. Positioning guide holes 39 are formed at the four corners of the flange portion 5b of the first exterior portion shown in FIG.
  • the electrode group 2 is accommodated in the first exterior part 5, and the electrode group side positive lead 12 is welded to the positive terminal lead 23.
  • the 2nd exterior part 6 is covered on the 1st exterior part 5 so that the exterior member 1 may become an axisymmetric shape.
  • the electrode group-side negative lead 14 is welded to the negative terminal lead 36 before the second exterior portion 6 is covered.
  • the welding method is, for example, laser welding.
  • the exterior member 1 obtained in this way is a substantially rectangular parallelepiped.
  • the positive electrode terminal portion 3 is disposed on the side intersecting with the bottom surface of the exterior member 1 on one side surface of the two opposing side surfaces on the short side side of the exterior member 1.
  • the negative electrode terminal part 4 is arrange
  • the negative electrode terminal portion 4 provided in the second exterior portion 6 faces the positive electrode terminal portion 3 provided in the first exterior portion 5.
  • the flange part 5b of the 1st exterior part 5 and the flange part 6b of the 2nd exterior part 6 are piled up. Since the first exterior portion 5 and the second exterior portion 6 have guide holes 39 opened at the four corners of the respective flange portions, the position of the second exterior portion 6 relative to the first exterior portion 5 is determined. Is easy.
  • the battery according to the first embodiment can include a plurality of electrode groups in one exterior member.
  • the second exterior part it is desirable to use a part having a flange part at the open end, similarly to the first exterior part.
  • the plurality of electrode groups can be connected in series or in parallel.
  • 25 to 28 show examples in which a plurality of electrode groups are connected in parallel.
  • the first electrode group 50 is stacked on the second electrode group 51, and the positive electrode current collecting tab 7 a of the first electrode group 50 and the positive electrode current collector of the second electrode group 51 are stacked.
  • the tab 7a is electrically connected by a fourth positive electrode lead 52, and the negative electrode current collecting tab 8a of the first electrode group 50 and the negative electrode current collecting tab 8a of the second electrode group 51 are connected to a fourth negative electrode lead (illustrated). Do not connect).
  • the positive electrode current collecting tabs 7a of the first and second electrode groups 50 and 51 are bent inward as necessary.
  • the negative electrode current collecting tab 7a is also bent in the same manner.
  • the fourth positive lead 52 is welded to the positive terminal lead 23. Further, the fourth negative electrode lead is welded to the negative electrode terminal lead 36. Thereafter, the battery shown in FIG. 28 is completed through a process of housing the electrode group in the exterior member.
  • the fourth positive electrode lead and the fourth negative electrode lead can be formed of the same materials as those mentioned for the first to third positive electrode leads and the negative electrode lead.
  • the battery according to the first embodiment described above includes a flat electrode group, an exterior member including two exterior parts, and two terminal parts.
  • the electrode group includes a positive electrode, a positive electrode current collecting tab electrically connected to the positive electrode, a negative electrode, and a negative electrode current collecting tab electrically connected to the negative electrode.
  • the positive electrode current collection tab wound by the flat shape is located in a 1st end surface.
  • the negative electrode current collection tab wound by the flat shape is located in a 2nd end surface.
  • Each of the two exterior parts has a bottom part and a side wall. The two exterior portions are welded together, and the electrode group is accommodated in a storage space defined by the bottom and side walls of one exterior portion and the bottom and side walls of the other exterior portion.
  • the two terminal parts are respectively provided on the side wall of one exterior part and the side wall of the other exterior part. Therefore, the electrical resistance can be reduced when a plurality of batteries are connected.
  • terminal part mentioned above may be applied to both a positive electrode terminal part and a negative electrode terminal part, it is also possible to apply to any one of a positive electrode terminal part or a negative electrode terminal part.
  • the battery pack according to the second embodiment includes at least one battery according to the first embodiment.
  • An example of the battery pack of the second embodiment is shown in FIG.
  • FIG. 29 is a schematic diagram illustrating an example of a battery pack according to the embodiment.
  • FIG. 30 is a schematic diagram illustrating an example of a battery pack according to a reference example.
  • a battery pack 101 shown in FIG. 29 includes an assembled battery 102 including the battery 100 of the first embodiment as a unit cell.
  • the assembled battery 102 includes an assembled battery unit 65 a in which a first unit cell 100 a and a second unit cell 100 b as the battery 100 are connected in series using a conductive connecting member 62.
  • the assembled battery 102 includes an assembled battery unit 65 b in which the first unit cell 100 c and the second unit cell 100 d as the battery 100 are connected in series using the conductive connecting member 62.
  • the end bus bar 300 is welded and electrically connected to the negative electrode external terminal 32 provided in the first unit cell 100a.
  • the negative terminal portion 4 included in the first unit cell 100a has the same structure as the terminal portion described with reference to FIGS.
  • the bus bar 300 can be used for electrical connection with other batteries or the like.
  • the positive terminal portion 3 included in the first unit cell 100a has the same structure as the terminal portion described with reference to FIG.
  • a triangular prism-shaped conductive connecting member 62 is disposed between the top surface of the positive external terminal 17 of the first unit cell 100a and the top surface of the negative external terminal 32 of the second unit cell 100b.
  • the two top surfaces and the conductive connecting member 62 are electrically connected by welding.
  • welding for example, laser welding, arc welding, or resistance welding is used.
  • the end bus bar 300 is welded and electrically connected to the positive electrode external terminal 17 included in the second unit cell 100d.
  • the positive terminal portion 3 provided in the second unit cell 100d has the same structure as the terminal portion described with reference to FIGS.
  • the bus bar 300 can be used for electrical connection with other batteries or the like.
  • the negative terminal portion 4 included in the second unit cell 100d has the same structure as the terminal portion described with reference to FIG.
  • a triangular prism-shaped conductive connecting member 62 is disposed between the top surface of the positive electrode external terminal 17 of the first unit cell 100c and the top surface of the negative electrode external terminal 32 of the second unit cell 100d.
  • the two top surfaces and the conductive connecting member 62 are electrically connected by welding.
  • welding for example, laser welding, arc welding, or resistance welding is used.
  • the adjacent first unit cell 100a and second unit cell 100b are stacked with the main surfaces of the exterior members 1 facing each other.
  • the volume energy density of an assembled battery can be made high by laminating
  • the first unit cell 100a and the second unit cell 100b include a top surface of the positive electrode external terminal 17 included in the first unit cell 100a and a top surface of the negative electrode external terminal 32 included in the second unit cell 100b. Are stacked so that they face each other. As described above, these top surfaces are electrically connected via the conductive connecting member 62 having a triangular prism shape.
  • the first unit cell 100c and the second unit cell 100d adjacent to each other are stacked with the main surfaces of the exterior members 1 facing each other.
  • the first unit cell 100c and the second unit cell 100d include a top surface of the positive external terminal 17 included in the first unit cell 100c and a top surface of the negative external terminal 32 included in the second unit cell 100d. Are stacked so that they face each other. As described above, these top surfaces are electrically connected via the conductive connecting member 62 having a triangular prism shape.
  • the second unit cell 100b included in the assembled battery unit 65a and the first unit cell 100c included in the assembled battery unit 65b are stacked with the main surfaces of the exterior members 1 facing each other. Yes.
  • the assembled battery unit 65a and the assembled battery unit 65b are stacked such that the top surface of the positive electrode external terminal 17 included in the unit cell 100b faces the top surface of the negative electrode external terminal 32 included in the unit cell 100c. Yes.
  • These top surfaces are electrically connected via a conductive connecting member 62 having a triangular prism shape.
  • the battery pack 101 includes the assembled battery 102 in which four unit cells as the battery 100 are connected in series.
  • the plurality of batteries 100 (100a to 100d) are all connected via a conductive connecting member 62 having a triangular prism shape. Therefore, since the connection distance between two adjacent batteries 100 is short, the electrical resistance of the assembled battery 102 as a whole can be reduced.
  • FIG. 30 shows a battery pack 201 according to a reference example.
  • the exterior members included in the batteries 200a to 200d are each composed of a first exterior part and a second exterior part.
  • a 1st exterior part is a square tube container with a bottom, and is provided with a bottom part and four side walls.
  • the four side walls included in the first exterior part include a pair of short side walls and a pair of long side walls.
  • the second exterior part is a rectangular plate.
  • An electrode group is stored in a storage space defined by the combination of the first exterior part and the second exterior part.
  • Both of the two terminal portions provided in the battery 200a are provided in the first exterior portion.
  • the second exterior part does not include a terminal part.
  • the battery 200a includes the positive electrode terminal portion 3 at a corner portion where the bottom portion of the first exterior portion and one short side wall intersect.
  • the battery 200a includes a negative electrode terminal portion 4 at a corner portion where the bottom portion of the first exterior portion and the other short side wall intersect.
  • the batteries 200b to 200d have the same configuration as the battery 200a.
  • the battery pack 201 uses two bus bars 204 for electrical connection between two adjacent batteries 200a and 200b and electrical connection between two adjacent batteries 200c and 200d. As a result, the battery pack 201 has a higher electrical resistance because the connection distance between the plurality of batteries is longer than that of the battery pack 101 shown in FIG. Moreover, in the battery pack 201, the insulating plate 203 is typically used in order to prevent the battery 200b and the battery 200c from being short-circuited. On the other hand, since the battery pack 101 according to the embodiment can omit the insulating plate 203, the volume energy density can be further improved.
  • the number of batteries included in the assembled battery is four, but the number is not particularly limited as long as it is two or more.
  • the number of batteries included in the assembled battery is three or more, and all three or more batteries are laminated so that the top surface of the external terminal of one adjacent battery faces the top surface of the external terminal of the other battery. And are preferably electrically connected.
  • at least two of the three or more batteries are stacked and electrically stacked such that the top surface of the external terminal of one adjacent battery faces the top surface of the external terminal of the other battery. It is preferable that it is connected to.
  • the battery pack of the second embodiment includes at least one battery of the first embodiment, the electrical resistance can be reduced when a plurality of batteries are connected.
  • the battery pack is used, for example, as a power source for electronic devices and vehicles (railway vehicles, automobiles, motorbikes, light vehicles, trolley buses, etc.).
  • the assembled battery may include a plurality of batteries electrically connected in series, parallel, or a combination of series and parallel.
  • the battery pack can include a circuit such as a battery control unit (Battery Control Unit, BMU).
  • BMU Battery Control Unit
  • the battery control unit has a function of preventing overcharge and overdischarge by monitoring the voltage and / or current of the cell and the assembled battery.
  • the battery according to at least one embodiment described above includes a flat electrode group, an exterior member including two exterior parts, and two terminal parts.
  • the electrode group includes a positive electrode, a positive electrode current collecting tab electrically connected to the positive electrode, a negative electrode, and a negative electrode current collecting tab electrically connected to the negative electrode.
  • the positive electrode current collection tab wound by the flat shape is located in a 1st end surface.
  • the negative electrode current collection tab wound by the flat shape is located in a 2nd end surface.
  • Each of the two exterior parts has a bottom part and a side wall. The two exterior portions are welded together, and the electrode group is accommodated in a storage space defined by the bottom and side walls of one exterior portion and the bottom and side walls of the other exterior portion.
  • the two terminal parts are respectively provided on the side wall of one exterior part and the side wall of the other exterior part. Therefore, it is possible to provide a battery capable of reducing the electrical resistance when a plurality of batteries are connected.
  • positive electrode external terminal 18 ... first ring-shaped member, 19 ... first insulating gasket, 20 ... positive electrode terminal insulating member, 21 ... head, 21a, 21b ... first and second inclined surfaces, 21c ... top Surface, 22 ... shaft portion, 23 ... first positive electrode lead, 24 ... first positive electrode insulation Strong member 30... Through hole in second exterior part 31... Second burring part 32.
  • Negative external terminal 33.
  • Second insulating gasket 35 35 Negative terminal insulation 36, first negative electrode lead, 37 ... first negative electrode reinforcing member, 38 ... second insulating reinforcing member, 39 ... guide hole, 40, 41 ... seam weld, 62 ... conductive connecting member, 65a , 65b ...

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne : une batterie dans laquelle une résistance électrique peut être réduite lors de la connexion d'une pluralité de batteries ; et un bloc-batterie pourvu de la batterie. Selon un mode de réalisation, l'invention concerne une batterie comprenant : un groupe d'électrodes en forme de plaque plate ; un élément extérieur comprenant deux unités extérieures ; et deux unités bornes. Chacune des deux unités extérieures comporte une partie inférieure et une paroi latérale. Les deux unités extérieures sont soudées l'une à l'autre, et le groupe d'électrodes est logé dans un espace de réception délimité par la partie inférieure et la paroi latérale d'une unité extérieure et par la partie inférieure et la paroi latérale de l'autre unité extérieure. Les deux unités bornes sont disposées respectivement sur la paroi latérale d'une unité extérieure et sur la paroi latérale de l'autre unité extérieure.
PCT/JP2018/013669 2018-03-30 2018-03-30 Batterie et bloc-batterie WO2019187024A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/013669 WO2019187024A1 (fr) 2018-03-30 2018-03-30 Batterie et bloc-batterie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/013669 WO2019187024A1 (fr) 2018-03-30 2018-03-30 Batterie et bloc-batterie

Publications (1)

Publication Number Publication Date
WO2019187024A1 true WO2019187024A1 (fr) 2019-10-03

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Country Link
WO (1) WO2019187024A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013041788A (ja) * 2011-08-19 2013-02-28 Nisshin Steel Co Ltd リチウムイオン二次電池
JP2015159229A (ja) * 2014-02-25 2015-09-03 住友電気工業株式会社 電気化学デバイス用外装および電気二重層キャパシタ
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013041788A (ja) * 2011-08-19 2013-02-28 Nisshin Steel Co Ltd リチウムイオン二次電池
JP2015159229A (ja) * 2014-02-25 2015-09-03 住友電気工業株式会社 電気化学デバイス用外装および電気二重層キャパシタ
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

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