WO2022185591A1 - 組電池及び組電池製造方法 - Google Patents
組電池及び組電池製造方法 Download PDFInfo
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- WO2022185591A1 WO2022185591A1 PCT/JP2021/035366 JP2021035366W WO2022185591A1 WO 2022185591 A1 WO2022185591 A1 WO 2022185591A1 JP 2021035366 W JP2021035366 W JP 2021035366W WO 2022185591 A1 WO2022185591 A1 WO 2022185591A1
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- Prior art keywords
- electrode terminal
- busbar
- electrode
- hole
- bus bar
- Prior art date
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- 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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
-
- 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
-
- 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
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- 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
- the present invention relates to an assembled battery and an assembled battery manufacturing method.
- Patent Document 1 As background technology in this technical field, there is Japanese Patent No. 6392447 (Patent Document 1). This publication states, "While using battery bus bars with dimensional errors, the bus bars can be stably and reliably laser-welded to the electrode terminals, and the battery cells can be electrically connected in a low-resistance state.
- the busbar is provided with a notch for guiding the protrusion of the electrode terminal, and an exposure gap is provided between the notch and the protrusion for exposing the welding surface of the electrode terminal, and the busbar is inside the notch.
- the edge side is welded to the weld surface at the fillet weld, and the surface opposite to the weld surface of the electrode terminal is welded to the weld surface at the penetration weld, so that both the fillet weld and the penetration weld meet the specified conditions. This is because it is welded to the electrode terminal with the welding width.”
- Patent Literature 1 discloses a method of joining a terminal welding surface and a bus bar notch by laser fillet welding or penetration welding.
- the method disclosed in Patent Document 1 is to weld as wide an area as possible using the projecting portion of the terminal as a reference for laser irradiation.
- the gasket is provided as a sealing material between the terminal and the cover member, and maintains the sealing performance by the repulsive force caused by the compression.
- the gasket is made of resin, if the temperature rises above the limit due to heat, there is a risk that the repulsive force will decrease due to deterioration and the sealing performance will be impaired.
- Laser welding generates heat above the melting point of the metal, so although the joint between the metal and the gasket does not melt, the heat transfer from the metal to the gasket can reach a temperature high enough to degrade the gasket. Therefore, the present invention provides a structure that efficiently joins the terminals and the busbar while reducing the thermal effect on the gasket.
- the present application includes a plurality of means for solving the above problems.
- a plurality of batteries including a sealing member provided between and sealing between the container and the electrode terminals; and bus bars respectively joined to the electrode terminals of different batteries.
- the electrode terminal includes an electrode terminal protrusion extending away from the one surface
- the bus bar includes a bus bar hole into which the electrode terminal protrusion is inserted, and the electrode terminal and the bus bar are connected to the electrode terminal protrusion. and the busbar hole are fitted and abutted, and the connecting portion between the outer surface of the electrode terminal protrusion and the inner surface of the busbar hole is at least partially welded. be.
- FIG. 2 is an exploded perspective view showing a state in which a part of the wound electrode group is unfolded; Appearance perspective view of battery module Cross-sectional view of a fitting portion between a terminal and a bus bar of Embodiment 1 Cross-sectional view of the fitting portion after joining the terminal and the bus bar in Example 1 Cell and busbar top view of Example 1 Cell and busbar top view of Example 2 Cell and busbar top view of Example 3 A cross-sectional view of a fitting portion between a terminal and a busbar in Example 3
- FIG. 1 is an external perspective view of a flat wound secondary battery.
- a flat wound secondary battery 100 includes a battery can 1 and a lid (battery lid) 6 .
- the battery can 1 has a side surface having a pair of wide side surfaces 1b with a relatively large area and a pair of narrow side surfaces 1c with a relatively small area, and a bottom surface 1d.
- the winding group 3 is accommodated in the battery can 1 , and the opening 1 a of the battery can 1 is sealed with the battery lid 6 .
- the battery lid 6 has a substantially rectangular flat plate shape and is welded so as to close the upper opening 1a of the battery can 1 to seal the battery can 1 .
- the battery lid 6 is provided with a positive external terminal 14 and a negative external terminal 12 .
- the winding group 3 is charged through the positive electrode external terminal 14 and the negative electrode external terminal 12, and electric power is supplied to the external load.
- a gas discharge valve 10 is provided integrally with the battery lid 6. When the pressure inside the battery container rises, the gas discharge valve 10 opens to discharge the gas from the inside, thereby reducing the pressure inside the battery container. This ensures the safety of the flat wound secondary battery 100 .
- FIG. 2 is an exploded perspective view of a prismatic secondary battery.
- the battery can 1 of the flat wound secondary battery 100 has a rectangular bottom surface 1d, side surfaces 1b and 1c forming a rectangular tube structure rising from the bottom surface 1d, and upper ends of the side surfaces 1b and 1c that are open upward. and an opening 1a.
- a winding group 3 is accommodated in the battery can 1 with an insulating protective film 2 interposed therebetween.
- the winding group 3 Since the winding group 3 is wound in a flat shape, it has a pair of semicircular portions facing each other and having a semicircular cross section, and a flat portion continuously formed between the pair of semicircular portions. have.
- the wound group 3 is inserted into the battery can 1 from one semicircular portion so that the winding axis direction is along the width direction of the battery can 1, and the other semicircular portion side is arranged on the upper opening side.
- the positive electrode foil exposed portion 34c of the winding group 3 is electrically connected to the positive electrode external terminal 14 provided on the battery lid 6 via the positive electrode collector plate (collector terminal) 44. Further, the negative electrode foil exposed portion 32 c of the wound group 3 is electrically connected to the negative electrode external terminal 12 provided on the battery cover 6 via the negative electrode collector plate (collector terminal) 24 .
- electric power is supplied from the winding group 3 to the external load via the positive electrode current collecting plate 44 and the negative electrode current collecting plate 24 , and the external power is supplied to the winding group 3 via the positive electrode current collecting plate 44 and the negative electrode current collecting plate 24 . Generated power is supplied and charged.
- the gasket 5 as a sealing member and the insulating plate are provided. 7 is provided on the battery lid 6 . Further, after the electrolyte is injected into the battery can 1 from the liquid injection port 9, the liquid injection plug 11 is joined to the battery lid 6 by laser welding to seal the liquid injection port 9, thereby forming a flat wound secondary battery. 100 is sealed.
- examples of materials for forming the positive electrode external terminal 14 and the positive current collector plate 44 include aluminum alloys, and examples of materials for the negative external terminal 12 and the negative electrode current collector plate 24 include copper alloys.
- Materials for forming the insulating plate 7 and the gasket 5 include insulating resin materials such as polybutylene terephthalate, polyphenylene sulfide, and perfluoroalkoxy fluorine resin.
- the battery lid 6 is provided with an injection port 9 for injecting the electrolyte into the battery container.
- the electrolyte to be injected into the battery container for example, a non-aqueous electrolyte in which a lithium salt such as lithium hexafluorophosphate (LiPF6) is dissolved in a carbonate-based organic solvent such as ethylene carbonate is applied. can do.
- the positive electrode external terminal 14 and the negative electrode external terminal 12 have welded joints that are welded to a busbar or the like.
- the weld joint has a rectangular parallelepiped block shape that protrudes upward from the battery lid 6.
- the lower surface faces the surface of the battery lid 6, and the upper surface is parallel to the battery lid 6 at a predetermined height. have.
- the positive electrode connection portion 14b and the negative electrode connection portion 12b protrude from the lower surfaces of the positive electrode external terminal 14 and the negative electrode external terminal 12, respectively, and have cylindrical shapes whose ends can be inserted into the positive electrode side through hole 46 and the negative electrode side through hole 26 of the battery cover 6. have.
- the positive electrode connecting portion 14b and the negative electrode connecting portion 12b pass through the battery lid 6 and extend inside the battery can 1 from the positive electrode current collector plate 44, the positive electrode current collector plate base portion 41 of the negative electrode current collector plate 24, and the negative electrode current collector plate base portion 21.
- the positive electrode external terminal 14 , the negative electrode external terminal 12 , the positive current collector plate 44 , and the negative electrode current collector plate 24 are integrally fixed to the battery lid 6 by crimping the ends thereof.
- a gasket 5 is interposed between the positive electrode external terminal 14, the negative electrode external terminal 12, and the battery lid 6, and an insulating plate is interposed between the positive electrode collector plate 44, the negative electrode collector plate 24, and the battery lid 6. 7 are interposed.
- the positive electrode current collector plate 44 and the negative electrode current collector plate 24 are composed of a rectangular plate-like positive electrode current collector plate base portion 41 , a negative electrode current collector plate base portion 21 , and a positive electrode current collector plate base portion 41 arranged facing the lower surface of the battery lid 6 . , are bent at the side ends of the negative electrode current collector plate base 21, extend toward the bottom side along the wide surface of the battery can 1, and extend to the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c of the winding group 3. It has a positive electrode side connection end portion 42 and a negative electrode side connection end portion 22 that are connected in an overlapping state facing each other. A positive electrode side opening hole 43 and a negative electrode side opening hole 23 through which the positive electrode connecting portion and the negative electrode connecting portion are inserted are formed in the positive electrode current collector plate base portion 41 and the negative electrode current collector plate base portion 21, respectively.
- the insulation protection film 2 is wound around the winding group 3 with the central axis along the flat surface of the winding group 3 and perpendicular to the winding axial direction of the winding group 3 .
- the insulating protective film 2 is made of a single sheet or a plurality of film members made of a synthetic resin such as polypropylene, and is wound in a direction parallel to the flat surface of the wound group 3 and perpendicular to the winding axis direction. It has a length that can be wrapped as a Furthermore, the insulating protective film 2 prevents contact between the winding group 3 and the battery can 1 by covering the winding group 3 on the bottom surface 1 d side of the battery can 1 .
- FIG. 3 is an exploded perspective view showing a partially unfolded state of the wound electrode group.
- the winding group 3 is formed by flatly winding a negative electrode 32 and a positive electrode 34 with separators 33 and 35 interposed therebetween.
- the electrode on the outermost circumference is the negative electrode 32, and separators 33 and 35 are further wound on the outer side thereof.
- the separators 33 and 35 have a role of insulating between the positive electrode 34 and the negative electrode 32 .
- the portion of the negative electrode 32 coated with the negative electrode mixture layer 32b is larger in the width direction than the portion of the positive electrode 34 coated with the positive electrode mixture layer 34b. , is always sandwiched between the portions where the negative electrode mixture layer 32b is applied.
- the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are bundled at their flat portions and connected by welding or the like.
- the separators 33 and 35 are wider in the width direction than the portion where the negative electrode mixture layer 32b is applied, but are wound at positions where the metal foil surfaces of the end portions are exposed at the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c. Therefore, it does not interfere with bundling and welding.
- the positive electrode 34 has a positive electrode active material mixture on both sides of the positive electrode foil, which is a positive electrode current collector, and a positive electrode foil on which the positive electrode active material mixture is not applied to one end in the width direction of the positive electrode foil.
- An exposed portion 34c is provided.
- the negative electrode 32 has a negative electrode active material mixture on both sides of the negative electrode foil which is a negative electrode current collector, and a negative electrode foil not coated with the negative electrode active material mixture on the other widthwise end of the positive electrode foil.
- An exposed portion 32c is provided.
- the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are regions where the metal surface of the electrode foil is exposed, and are wound so as to be positioned on one side and the other side in the winding axial direction.
- the positive electrode 34 100 parts by weight of lithium manganate (chemical formula LiMn2O4) as a positive electrode active material, 10 parts by weight of flake graphite as a conductive material, and 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) as a binder. ), to which N-methylpyrrolidone (hereinafter referred to as NMP) as a dispersion solvent was added and kneaded to prepare a positive electrode mixture.
- NMP N-methylpyrrolidone
- This positive electrode mixture was applied to both surfaces of an aluminum foil (positive electrode foil) having a thickness of 20 ⁇ m, leaving a welded portion (positive electrode uncoated portion). Then, through drying, pressing, and cutting steps, a positive electrode 34 having a thickness of 90 ⁇ m in the positive electrode active material-coated portion without aluminum foil was obtained.
- lithium manganate as the positive electrode active material
- other lithium manganate having a spinel crystal structure lithium manganese composite oxide partially substituted or doped with a metal element, Lithium cobalt oxide or lithium titanate having a layered crystal structure, or a lithium-metal composite oxide in which a portion of these is substituted or doped with a metal element may be used.
- negative electrode 32 10 parts by weight of PVDF as a binder is added to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and NMP is added as a dispersion solvent to this, and then kneaded to form a negative electrode mixture. made.
- This negative electrode mixture was applied to both surfaces of a copper foil (negative electrode foil) having a thickness of 10 ⁇ m, leaving a welded portion (negative electrode uncoated portion). Then, through drying, pressing, and cutting steps, a negative electrode 32 having a thickness of 70 ⁇ m at the portion coated with the negative electrode active material and not including the copper foil was obtained.
- amorphous carbon is used as the negative electrode active material, but it is not limited to this, and natural graphite capable of intercalating and deintercalating lithium ions, and various artificial graphite materials , a carbonaceous material such as coke, a compound such as Si or Sn (eg, SiO, TiSi2, etc.), or a composite material thereof.
- the shape of the particles is not particularly limited and may be scaly, spherical, fibrous, lumpy, or the like.
- PVDF a binding material for the coated portions of the positive electrode and the negative electrode
- Polymers such as polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins, and mixtures thereof can be used.
- the shaft core for example, a wound resin sheet having higher bending rigidity than any of the positive electrode foil, the negative electrode foil, and the separator 33 can be used.
- FIG. 4 is an external perspective view of the battery module.
- the battery module 80 is obtained by arranging a plurality of the above flat wound secondary batteries 100 and joining them in series.
- a bus bar 50 is used for electrical connection between the cells, and the positive and negative terminals are respectively connected by laser welding. Since the materials of the positive and negative terminals are aluminum and copper, respectively, it is necessary to join the same metals with laser welding. For this reason, busbars use aluminum and copper clad materials to convert materials on the busbar components. Using a clad material bus bar, aluminum and copper are laser-welded to join the same metals as the terminals.
- FIG. 5 is a cross-sectional view of the joint between the terminal and the bus bar in Example 1
- FIG. 6 is a cross-sectional view after welding the joint between the terminal and the bus bar, and FIG. be.
- the terminals 14 are provided with electrode terminal protrusions 14a on the upper surface of the cell
- the busbars 50 are provided with busbar holes 50a into which the electrode terminal protrusions 14a are fitted.
- the structure of the positive electrode side is illustrated, but the same structure can be applied to the negative electrode as well.
- the electrode terminal projecting portion 14a and the busbar hole 50a are each round with a diameter of about 2 mm to 4 mm.
- one electrode terminal protrusion 14a is provided at the central portion of the terminal, but a plurality of electrode terminal protrusions 14a may be provided.
- a plurality of electrode terminal protrusions 14a it is necessary to reduce the diameter of the electrode terminal protrusions 14a and the diameter of the busbar hole 50a. This is because an area for contacting the cell charging probe is required.
- the increased number of busbar holes 50a makes it difficult to process the terminals, and the presence of a plurality of busbar holes 50a must also consider the impact on the strength. Considering the effect on the processing, it is desirable to set the number of electrode terminal projections 14a to about one or two.
- the bus bar 50 is fitted by aligning the bus bar hole 50a with the electrode terminal protrusion 14a. Therefore, in order to improve positioning and fitting, it is necessary to make the fitting condition looser tolerance.
- the dimensions of the electrode terminal projecting portion 14a and the busbar 50 hole a are determined so that the gap between the electrode terminal projecting portion 14a and the busbar 50 hole a is about 0.1 mm.
- the edge of the outer periphery of the upper surface of the electrode terminal projecting portion 14a is rounded or cornered.
- the edge of the inner periphery of the busbar hole 50a facing the electrode terminal protrusion 14a is rounded or cornered.
- R-machining or corner-machining of the electrode terminal projecting portion 14a and round-machining or corner processing of the bus bar hole 50a are both about 0.1 mm to 0.5 mm to allow sufficient fitting.
- the electrode terminal projecting portion 14a and the busbar hole 50a are fitted, and the outer surface of the electrode terminal projecting portion 14a and the inner surface of the busbar hole 50a are butt-welded by laser.
- the laser welding diameter is set to about 0.5 mm to 1.0 mm, it is possible to achieve sufficient penetration even with loose fitting tolerances.
- the electrode terminal protrusions 14a protrude beyond the busbars 50 when they are fitted.
- the bus bar 50 may have a thickness of approximately 0.8 mm to 1.0 mm
- the electrode terminal protrusion 14a may have a height of 1.0 mm or more.
- the height of the electrode terminal protrusion 14a is preferably about 1.2 mm.
- effects can be obtained whether the fitting structure described above is applied to both the positive and negative electrodes or only to one side of the positive and negative electrodes.
- the material of the positive electrode is aluminum, and a sufficient amount of penetration is required to obtain strength. Since the material of the negative electrode is copper, a laser output is required due to the influence of the reflectance.
- FIG. 8 is a cross-sectional view of a joint portion between a terminal and a busbar in Example 2.
- Example 1 the shape of the electrode terminal projecting portion 14a was round, but in Example 2, it was an oval shape.
- the busbar hole 50a is an elongated hole, and the elongated hole is positioned parallel to the short side of the terminal. By lengthening the straight portion of the long hole, a large welding area can be obtained.
- the busbar hole 50a longer than the shape of the electrode terminal protrusion 14a, it is possible to facilitate positioning for fitting. The abutting portion between the outer surface of the electrode terminal projecting portion 14a and the inner surface of the busbar hole 50a becomes longer, and a larger welding area can be obtained.
- FIG. 9 is a top view of cells and busbars of Example 3, and FIG. Descriptions of portions similar to those of the first and second embodiments are omitted.
- the upper surface of the electrode terminal protrusion 14a has a larger area than the upper surfaces of the terminals other than the electrode terminal protrusion 14a.
- the electrode terminal projecting portion 14a has the same shape as the external shape of the positive electrode terminal 14, with one side shorter by about 1 to 2 mm. For example, when the outer shape of the positive electrode external terminal 14 is 10.5 mm ⁇ 7.5 mm, the outer shape of the electrode terminal protrusion 14a may be 9 mm ⁇ 6 mm.
- Example 2 the shape of the busbar hole 50a was elongated to increase the welding area, but this had the effect of reducing the contact area of the cell charging probe.
- Example 3 by increasing the area of the upper surface of the electrode terminal protrusion 14a, the contact area of the charging probe and the resistance measuring probe for connection confirmation can be brought into contact with the upper surface of the electrode terminal protrusion 14a.
- a U-shaped notch is provided at the end of the bus bar 50, and the electrode terminal protrusion 14a is brought into contact with and locked to the inner side of the U-shape.
- the flat wound secondary battery 100 which is the assembled battery according to the embodiment, includes a container containing a charge/discharge body, electrode terminals provided on one surface of the container, the container and the a sealing member that is provided between the container and the electrode terminal and seals between the container and the electrode terminal. Furthermore, the flat wound secondary battery 100 has busbars that are respectively joined to the electrode terminals of the different batteries.
- the electrode terminal includes an electrode terminal protrusion extending away from the one surface
- the bus bar includes a bus bar hole into which the electrode terminal protrusion is inserted, and the electrode terminal and the bus bar are connected to the electrode terminal protrusion. The portion and the busbar hole are fitted and abutted, and the connecting portion between the outer surface of the electrode terminal protrusion and the inner surface of the busbar hole is at least partially welded.
- the welding position becomes far from the gasket, so that the thermal effect of welding on the busbar can be reduced.
- the thermal effect of the laser on the gasket becomes more apprehensive, but the thermal effect can be reduced by making the welded portion with the busbar a protrusion as in the present invention.
- the thermal effect can be reduced is that the laser is efficiently incident on the butt welding between the outer surface of the electrode terminal protrusion and the inner surface of the busbar hole, which enables efficient melting with a small output.
- the heat effect can be reduced is that by fitting and joining the terminal and the bus bar, it is possible to maintain structural strength in the shear direction and reduce the strength required for the fusion zone. Therefore, the penetration can be reduced. This is because there is no need to perform penetration welding to obtain strength, and it is sufficient to ensure electrical continuity. Further, in the present invention, the effect can be obtained even if the fitting structure described above is applied to both the positive and negative electrodes or only to one side of the positive and negative electrodes.
- the material of the positive electrode is aluminum, and a sufficient amount of penetration is required to obtain strength. Since the material of the negative electrode is copper, laser output is required due to the effect of reflectance.
- the electrode terminal projections are made higher than the thickness of the bus bar, and the electrode terminal projections protrude from the upper surface, thereby facilitating the inspection after bonding.
- the inspection after bonding is a resistance test for ensuring electrical bonding, and is measured by bringing an inspection probe into contact with the electrode terminal projecting portion projecting from the bus bar. Contact failure can be reduced by directly aiming at the electrode terminal projecting portion with respect to the error of the probe position.
- the bus bar has a bus bar hole penetrating through a portion in contact with the electrode terminal, and the hole fits with the electrode terminal projection to allow movement in the shear direction.
- the busbars can be easily positioned, and the inner side surfaces of the busbar holes and the outer side surfaces of the electrode terminal protrusions can be used for welding.
- the welding does not have to be performed for the purpose of obtaining structural strength, and low-power welding for the purpose of ensuring electrical continuity is sufficient.
- the entire boundary between the busbar hole and the electrode terminal protrusion may be welded, or only a portion thereof may be welded.
- the electrode terminal has a structure in which a slope is provided on the edge of the outer periphery of the electrode terminal protrusion.
- the busbar hole has an inclined surface on the edge of the inner circumference facing the electrode terminal. These slopes may be flat inclined surfaces or curved surfaces. These slopes make it easier to fit and position the busbar hole and the electrode terminal protrusion.
- the busbar hole may be an elongated hole, and a structure may be adopted in which movement of the elongated hole in the lateral direction is restricted by contact with the fitted electrode terminal protrusion.
- the electrode terminal protrusion may be oval or circular. If the shape of the electrode terminal projection is oval, the boundary between the busbar hole and the electrode terminal projection becomes long, which is advantageous for welding. On the other hand, if the shape of the electrode terminal projecting portion is circular, it is possible to provide a margin of tolerance in the longitudinal direction of the elongated hole.
- the second step of welding the electrode terminals and the busbars is performed.
- the first step is to fit the electrode terminal protrusions into the busbar holes for assembly
- the second step is to perform the assembly along the boundary between the outer surface of the electrode terminal protrusions and the inner surface of the busbar holes. are at least partially welded. Therefore, the terminal and the bus bar can be efficiently joined while reducing the thermal effect on the gasket.
- the third step of inspecting the welding state between the electrode terminal and the bus bar can be performed by bringing an inspection tool into contact with the electrode terminal protrusion. This is because the electrode terminal protrusions are exposed even after the bus bar is welded, as disclosed in the embodiments.
- the laser light focused to a diameter larger than the gap between the electrode terminal protrusion and the busbar hole is separated from the electrode terminal protrusion and the busbar hole.
- the thermal influence on the gasket can be further reduced by irradiating the boundaries with the busbar holes and welding them together.
- the bus bar is provided with a hole or notch, and the electrode terminal protrusion of the electrode terminal is penetrated or locked, but the shape of the bus bar and the electrode terminal protrusion can be changed arbitrarily.
- the electrode terminal may be provided with two electrode terminal protrusions, and the end of the bus bar may be assembled between the two electrode terminal protrusions.
- a structure may be adopted in which a U-shaped electrode terminal projection is provided on the electrode terminal, and the end of the busbar is accommodated inside the U-shape.
- any structure can be employed as long as the movement in the shear direction is restricted by the contact of the electrode terminal with the electrode terminal protrusion while the bus bar is in contact with the electrode terminal. This is because, in any structure, by restricting the movement of the bus bar, there is no need to require welding to ensure structural strength. As a result, the laser output can be suppressed, and the terminal and the bus bar can be efficiently joined while reducing the thermal effect on the gasket.
- 1 battery can, 1a: opening, 1b: wide side surface, 1c: narrow side surface, 1d: bottom surface, 2: insulating protective film, 3: winding group, 5: gasket, 6: battery lid, 7: insulating plate , 9: injection port, 10: gas discharge valve, 11: injection plug, 12: negative electrode external terminal, 12b: negative electrode connection portion, 14: positive electrode external terminal, 14a: electrode terminal protrusion, 14b: positive electrode connection portion, 21: Negative electrode current collector base, 22: Negative electrode side connection end portion, 23: Negative electrode side opening hole, 24: Negative electrode current collector plate, 26: Negative electrode side through hole, 32: Negative electrode, 32b: Negative mixture layer, 32c : negative electrode foil exposed portion, 33: separator, 34: positive electrode, 34b: positive electrode mixture layer, 34c: positive electrode foil exposed portion, 35: separator, 41: positive electrode current collector base, 42: positive electrode side connection end portion, 43 : positive electrode side opening hole 44: positive electrode current collector plate 46: positive electrode
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Abstract
Description
このため本発明では、ガスケットへの熱影響を少なくしながら、端子とバスバを効率よく接合する構造を提供する。
本願は上記課題を解決する手段を複数含んでいるが、その一例をあげるならば「充放電体が収容された容器と、前記容器の一面に設けられた電極端子と、前記容器と前記電極端子との間に設けられ前記容器と前記電極端子との間を封止する封止部材と、を備えた複数の電池と、異なる前記電池の前記電極端子にそれぞれ接合されるバスバと、を有し、前記電極端子は、前記一面から離れる方向に延びた電極端子突起部を備え、前記バスバは、前記電極端子突起部を嵌入するバスバ孔を備え、前記電極端子と前記バスバは、前記電極端子突起部と前記バスバ孔が嵌合し、かつ、当接し、前記電極端子突起部の外側面と、バスバ孔の内側面と、の接続部は、少なくとも部分的に溶接されている、組電池」である。
図1は、扁平捲回形二次電池の外観斜視図である。
扁平捲回形二次電池100は、電池缶1および蓋(電池蓋)6を備える。電池缶1は、相対的に面積の大きい一対の対向する幅広側面1bと相対的に面積の小さい一対の対向する幅狭側面1cとを有する側面と底面1dを有し、その上方に開口部1aを有する。
扁平捲回形二次電池100の電池缶1は、矩形の底面1dと、底面1dから立ち上がる角筒構造を構成する側面1b、1cと、側面1b、1cの上端で上方に向かって開放された開口部1aとを有している。電池缶1内には、絶縁保護フィルム2を介して捲回群3が収容されている。
捲回群3は、負極電極32と正極電極34を間にセパレータ33、35を介して扁平状に捲回することによって構成されている。捲回群3は、最外周の電極が負極電極32であり、さらにその外側にセパレータ33、35が捲回される。セパレータ33、35は、正極電極34と負極電極32との間を絶縁する役割を有している。
さらに、扁平捲回形二次電池100は、異なる前記電池の前記電極端子にそれぞれ接合されるバスバを有する。そして、電極端子は、前記一面から離れる方向に延びた電極端子突起部を備え、前記バスバは、前記電極端子突起部を嵌入するバスバ孔を備え、前記電極端子と前記バスバは、前記電極端子突起部と前記バスバ孔が嵌合し、かつ、当接し、前記電極端子突起部の外側面と、バスバ孔の内側面と、の接続部は、少なくとも部分的に溶接されている。
熱影響の軽減を実現できる理由の一つは、電極端子突起部の外側面とバスバ孔の内側面との突合せ溶接によりレーザが効率よく入射することで、少ない出力で効率よく溶融することができる点にある。
また、熱影響の軽減を実現できる理由の一つは、端子とバスバを嵌合させて接合させることにより、せん断方向に対して構造的に強度を保持して溶融部に必要な強度を軽減できるため、溶け込みを少なくすることができる点にある。強度を得るために貫通溶接を行う必要がなく、導通を確保できれば十分だからである。
また、本発明では前述の嵌合構造を、正負極両方に適用しても、正負極片側だけに適用しても、効果を得ることができる。正極は材質がアルミであり、強度を得るために溶け込み量が必要のため、突起を設けることで効率よく溶け込ませることができる。負極は材質が銅のため、反射率の影響からレーザ出力が必要であり、電極端子突起部の外側面とバスバ孔の内側面との突合せ構造にすることで、少ないレーザ出力で溶接することができる。
さらに、本発明の構造によると、電極端子突起部をバスバ厚みよりも高くし、上面から電極端子突起部が突き出ることで接合後の検査を容易にすることができる。接合後の検査は、電気的な接合を保証するための抵抗検査であり、検査用のプローブをバスバから突き出た電極端子突起部に接触させて測定する。プローブ位置の誤差に対して、電極端子突起部を直接狙うことで接触不良を少なくすることができる。
このように、バスバ孔に電極端子突起部を嵌合させることで、バスバの位置決めが容易となり、バスバ孔の内側側面と電極端子突起部の外側側面とを溶接に用いることができる。さらに、嵌合によりバスバの動きが規制されるため、溶接は構造的な強度の獲得を目的とする必要がなく、電気的導通の確保を目的とした、低出力の溶接で足りる。
また、バスバ孔及び電極端子突起部とが接する境界の全てを溶接してもよいが、その一部のみを溶接してもよい。
このため、ガスケットへの熱影響を少なくしながら、端子とバスバを効率よく接合することができる。
一例として、電極端子に2つの電極端子突起部を設け、バスバの端部を2つの電極端子突起部の間に組み付ける構造としてもよい。
また、一例として、電極端子にU字型の電極端子突起部を設け、U字の内側にバスバの端部が収まる構造としてもよい。
このように、バスバが電極端子と接した状態で、電極端子の電極端子突起部との当接によって、せん断方向の動きを規制される構造であれば、任意の構造を採用可能である。いずれの構造であっても、バスバの動きを規制することで、溶接に構造的な強度の確保を求める必要がなくなるからである。この結果、レーザ出力を抑制することができ、ガスケットへの熱影響を少なくしながら、端子とバスバを効率よく接合することができる。
Claims (7)
- 充放電体が収容された容器と、前記容器の一面に設けられた電極端子と、前記容器と前記電極端子との間に設けられ前記容器と前記電極端子との間を封止する封止部材と、を備えた複数の電池と、
異なる前記電池の前記電極端子にそれぞれ接合されるバスバと、を有し、
前記電極端子は、前記一面から離れる方向に延びた電極端子突起部を備え、
前記バスバは、前記電極端子突起部を嵌入するバスバ孔を備え、
前記電極端子と前記バスバは、前記電極端子突起部と前記バスバ孔が嵌合し、かつ、当接し、
前記電極端子突起部の外側面と、バスバ孔の内側面と、の接続部は、少なくとも部分的に溶接されている、組電池。 - 前記電極端子は、前記電極端子突起部の外周の縁に斜面を備えることを特徴とする請求項1に記載の組電池。
- 前記バスバ孔は、前記電極端子に対向する内周の縁に斜面を備えることを特徴とする請求項1に記載の組電池。
- 前記バスバ孔は長孔であり、嵌合した前記電極端子突起部との当接により前記長孔の短手方向の動きに対して規制を受けることを特徴とする請求項1に記載の組電池。
- 充放電体が収容された容器と、前記容器の一面から離れる方向に延びた電極端子突起部が備えられた電極端子と、前記容器と前記電極端子との間に設けられ前記容器と前記電極端子との間を封止する封止部材と、を有する複数の電池に対し、異なる前記電池の前記電極端子を電気的に接続するバスバを組付ける第1工程と、
前記電極端子と前記バスバとを溶接する第2工程と、を有し、
前記第1工程は、前記バスバに設けられたバスバ孔に前記電極端子突起部を嵌入して組付けを行い、
前記第2工程は、前記電極端子突起部と前記バスバ孔の境界に沿った領域を少なくとも部分的に溶接する
ことを特徴とする組電池製造方法。 - 前記電極端子突起部に検査器具を接触させて、前記電極端子と前記バスバとの溶接状態を検査する第3工程を有する、請求項5に記載の組電池製造方法。
- 前記第2工程では、前記電極端子突起部と前記バスバ孔との境界の隙間よりも大きい直径に集光したレーザ光を、前記電極端子突起部と前記バスバ孔との境界に照射して互いに溶接する、請求項5又は6に記載の組電池製造方法。
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JP2015149282A (ja) * | 2014-02-07 | 2015-08-20 | 三星エスディアイ株式会社Samsung SDI Co.,Ltd. | バッテリーモジュール及びその製造方法 |
JP6392447B2 (ja) | 2015-03-31 | 2018-09-19 | 三洋電機株式会社 | バッテリシステム |
JP2020521297A (ja) * | 2017-10-10 | 2020-07-16 | エルジー・ケム・リミテッド | 電極リード接合用バスバー組立体及びそれを含むバッテリーモジュール |
US20200091570A1 (en) * | 2018-09-19 | 2020-03-19 | Samsung Sdi Co., Ltd. | Secondary battery |
JP2020115418A (ja) * | 2019-01-17 | 2020-07-30 | トヨタ自動車株式会社 | 組電池、及び、組電池の製造方法 |
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EP4303997A1 (en) | 2024-01-10 |
JPWO2022185591A1 (ja) | 2022-09-09 |
US20230402719A1 (en) | 2023-12-14 |
CN115769432A (zh) | 2023-03-07 |
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