WO2014050330A1 - Electricity storage device and welding method - Google Patents

Electricity storage device and welding method Download PDF

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Publication number
WO2014050330A1
WO2014050330A1 PCT/JP2013/071763 JP2013071763W WO2014050330A1 WO 2014050330 A1 WO2014050330 A1 WO 2014050330A1 JP 2013071763 W JP2013071763 W JP 2013071763W WO 2014050330 A1 WO2014050330 A1 WO 2014050330A1
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WO
WIPO (PCT)
Prior art keywords
external terminal
bus bar
hole
storage device
welded
Prior art date
Application number
PCT/JP2013/071763
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French (fr)
Japanese (ja)
Inventor
雅和 ▲堤▼
中村　純
Original Assignee
株式会社Ｇｓユアサ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Priority to JP2014538267A priority Critical patent/JP6258858B2/en
Publication of WO2014050330A1 publication Critical patent/WO2014050330A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • 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
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side 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
    • 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
    • H01M50/562—Terminals characterised by the material
    • 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 a power storage device including a power storage element having an external terminal and a bus bar connected to the external terminal.
  • the present invention also relates to a method for welding an external terminal of a power storage element and a bus bar.
  • chargeable / dischargeable storage elements such as batteries (lithium ion batteries, nickel metal hydride batteries, etc.) and capacitors (electric double layer capacitors, etc.) are used in vehicles (automobiles, motorcycles, etc.) and various devices (mobile terminals, notebook computers, etc.). It has been adopted as a power source.
  • various types of batteries are provided.
  • a battery module in which external terminals of a plurality of battery cells are connected by a conductive bus bar and configured as one battery (Patent Document 1).
  • the external terminals and the bus bar are laser-welded in order to connect the external terminals of the plurality of battery cells with the bus bar.
  • laser light is irradiated from the upper part of the bus bar.
  • the amount of heat required to melt the plate-like bus bar in the thickness direction is required. Therefore, the thermal damage of the external terminal, and further the thermal damage of the electrode body that is the internal structure of the battery cell are increased.
  • an object of the present invention is to provide a power storage device that can reduce thermal damage to the external terminal of the power storage element, and a method for welding the external terminal of the power storage element and the bus bar.
  • the power storage device includes: A storage element having an external terminal; A bus bar having a connection portion and connected to an external terminal at the connection portion; The connecting portion of the bus bar has a through hole, The inner side surface part which defines this through-hole, and the external terminal are welded.
  • the external terminal side of the inner side surface part defining the through hole and the external terminal are welded, You may do it.
  • a part of the inner surface portion in the circumferential direction or the entire circumference of the inner surface portion and the external terminal are welded, You may do it.
  • the external terminal has a shaft portion inserted into the power storage element,
  • the inner side surface part that defines the through hole and the part that is away from the shaft part in a direction intersecting the axis of the shaft part of the external terminals are welded, You may do it.
  • the through hole is arranged at a position overlapping the axial direction with respect to a location away from the axial portion of the external terminal in the direction intersecting the axial center of the axial portion. You may do it.
  • the welding method of the external terminal and the bus bar of the electricity storage device according to the present invention, A method of welding the external terminal and the bus bar of the electricity storage device having the external terminal, Laser light is irradiated toward the inner side surface from the boundary line between the external terminal and the inner side surface defining the through hole formed in the bus bar, and the inner side surface and the external terminal are welded.
  • FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention.
  • FIG. 2 shows a plan view of the battery module.
  • FIG. 3 shows a perspective view of a battery cell constituting the battery module.
  • FIG. 4 shows a perspective view of a bus bar for connecting the battery cells.
  • 5 shows an enlarged cross-sectional view of the bus bar taken along line VV of FIG.
  • FIG. 6 shows a partially enlarged cross-sectional view of the bus bar welded to the external terminal.
  • FIG. 7 is a plan view showing an aspect of a place where the bus bar is welded to the external terminal.
  • FIG. 8 is a plan view showing another aspect of the place where the bus bar is welded to the external terminal.
  • FIG. 9 shows a partial plan view of a battery module according to another embodiment of the present invention.
  • FIG. 10 is a partially enlarged cross-sectional view of a battery module according to still another embodiment of the present invention.
  • FIG. 11 is a partial plan view of a battery module according to still another embodiment of the present invention.
  • 12 shows an enlarged cross-sectional view of the battery module taken along line XII-XII of FIG.
  • the power storage device includes: A storage element having an external terminal; A bus bar having a connection portion and connected to an external terminal at the connection portion; The connecting portion of the bus bar has a through hole, The inner side surface part which defines this through-hole, and the external terminal are welded.
  • the inner side surface portion that defines the through hole of the connection portion of the bus bar and the external terminal are welded.
  • the external terminal side of the inner side surface part defining the through hole and the external terminal are welded. You may do it.
  • the external terminal side of the inner side surface portion defining the through hole and the external terminal are welded. Therefore, since the amount of heat for welding is further reduced, thermal damage to the external terminals can be further reduced.
  • a part of the inner surface portion in the circumferential direction or the entire circumference of the inner surface portion and the external terminal are welded, You may do it.
  • the external terminal has a shaft portion inserted into the power storage element,
  • the inner side surface part that defines the through hole and the part away from the shaft part in the direction intersecting the axis of the shaft part of the external terminals are welded. You may do it.
  • the shaft portion inserted into the power storage element is provided in the external terminal. And the location away from the said axial part in the direction which cross
  • the through hole is arranged at a position overlapping the axial direction with respect to a location away from the axial portion of the external terminal in the direction intersecting the axial center of the axial portion. You may do it.
  • the through hole is arranged at a position overlapping in the axial direction with respect to a location away from the axial portion in a direction intersecting with the axial center of the axial portion.
  • the welding method of the external terminal and the bus bar of the electricity storage device according to the present invention, A method of welding the external terminal and the bus bar of the electricity storage device having the external terminal, Laser light is irradiated toward the inner side surface side from the boundary line where the external terminal and the inner side surface portion defining the through hole formed in the bus bar come into contact, and the inner side surface portion and the external terminal are welded.
  • the laser beam is irradiated toward the inner side surface side from the boundary line where the external terminal and the inner side surface portion defining the through hole provided in the connection portion of the bus bar contact.
  • an external terminal and the inner surface part which demarcates a through-hole are welded.
  • heat amount for welding becomes small. Therefore, the thermal damage of the external terminal can be reduced.
  • the battery module according to the present embodiment includes a plurality of battery cells (storage elements) 1,... And a housing 10 that houses the plurality of battery cells 1.
  • the battery cell 1 includes a case 2 as shown in FIG.
  • the case 2 includes a case main body 2a having an opening and a lid plate 2b that closes and seals the opening of the case main body 2a.
  • An electrode body (not shown) is accommodated in the case 2.
  • the battery cell 1 can employ a rectangular battery having a rectangular parallelepiped appearance or a round battery having a cylindrical appearance.
  • the battery cell 1 which concerns on this embodiment is a square battery. Therefore, the case body 2a has a bottomed rectangular tube shape that is flat in the width direction.
  • the lid plate 2b is a rectangular plate material corresponding to the opening of the case body 2a.
  • the external gasket 3 is disposed on the outer surface of the case 2, more specifically, on the outer surface of the cover plate 2b.
  • the external terminal 4 is disposed on the outer surface of the external gasket 3.
  • the external gasket 3 has a recess, and the external terminal 4 is disposed in the recess.
  • the external terminal 4 is made of, for example, an aluminum-based metal material such as aluminum or an aluminum alloy.
  • a through opening (not shown) is formed in the lid plate 2b.
  • the through opening (see FIG. 6) is also formed in the external gasket 3.
  • the external gasket 3 is arranged on the outer surface of the cover plate 2b so that the through-opening of the external gasket 3 coincides with the through-opening of the cover plate 2b.
  • the external terminal 4 has a shaft portion 4a (see FIG. 6) that passes through these through openings.
  • a shaft portion 4a of the external terminal 4 penetrating the external gasket 3 and the cover plate 2b through the two through openings is connected to a current collector (not shown). This current collector is connected to the electrode body. Thereby, the external terminal 4 is electrically connected to the electrode body.
  • the external gasket 3 and the external terminal 4 for the positive electrode and the external gasket 3 and the external terminal 4 for the negative electrode are provided in the battery cell 1.
  • the external gasket 3 and the external terminal 4 for the positive electrode are disposed at one end in the longitudinal direction of the lid plate 2b.
  • the external gasket 3 and the external terminal 4 for the negative electrode are disposed at the other end in the longitudinal direction of the lid plate 2b.
  • the external gasket 3 and the external terminal 4 have a rectangular shape in plan view.
  • the external gasket 3 and the external terminal 4 have a rectangular shape in which the dimension in the width direction of the cover plate 2b is small and the dimension in the direction orthogonal to the width direction is small.
  • the upper part of the external terminal 4 is a flat surface 4b. Since the external terminal 4 is rectangular in plan view, the flat surface 4b is also rectangular. The flat surface 4b of the external terminal 4 is separated from the outer surface of the cover plate 2b. The flat surface 4 b of the external terminal 4 protrudes from the external gasket 3. The flat surface 4b of the external terminal 4 for positive electrode and the flat surface 4b of the external terminal 4 for negative electrode are at the same height position with respect to the outer surface of the cover plate 2b.
  • the plurality of battery cells 1,... are arranged in parallel so as to be aligned in the short direction of the cover plate 2b.
  • ten battery cells 1 are arranged in parallel.
  • Adjacent battery cells 1 and 1 are arranged so that the polarities are opposite. Thereby, by connecting the adjacent external terminals 4 and 4, all the battery cells 1 are connected in series, and one battery is comprised.
  • the external terminals 4 and 4 of the battery cells 1 and 1 arranged in the short direction of the cover plate 2 b are connected by a bus bar 5. More specifically, the external terminal 4 for the positive electrode of one of the adjacent battery cells 1, 1 and the external terminal for the negative electrode of the other battery cell 1 of the adjacent battery cells 1, 1. 4 is close. These external terminals 4 and 4 are connected to each other by a bus bar 5.
  • an external connection bus bar 5A includes an external terminal 4 of the battery cell 1 at one end of the plurality of battery cells 1 connected in series and a battery at the other end of the plurality of battery cells 1 connected in series. Each is connected to an external terminal 4 of the cell 1.
  • the bus bar 5A is an external connection bus bar connected to another battery module, another device, a load, or a power source.
  • the bus bar 5 includes a main body portion 6 and a pair of connection portions 7 and 7 provided at both ends of the main body portion 6.
  • the connection portion 7 is a portion that is placed on the flat surface 4 b of the external terminal 4 and connected to the external terminal 4.
  • the main body 6 connects a pair of connecting portions 7 and 7.
  • the bus bar 5 has a flat surface 5a and is formed in a flat plate shape that is rectangular in plan view.
  • the bus bar 5 is formed of, for example, a plate material made of an aluminum-based metal material such as aluminum or an aluminum alloy.
  • a through hole 8 is provided in the connecting portion 7.
  • the through hole 8 of the present embodiment is formed in a rectangular shape (square shape) in plan view. Moreover, this through-hole 8 has penetrated the connection part 7 so that it may become the same magnitude
  • the through hole 8 is not limited to a rectangular shape in plan view.
  • the through hole 8 may have a circular shape (perfect circular shape, elliptical shape), a polygonal shape, or the like in plan view.
  • the inner side surface portion 8a that defines the through hole 8 and the external terminal 4 are welded.
  • the external terminal 4 side portion of the inner side surface portion 8a and the external terminal 4 are welded.
  • the plurality of battery cells 1,... are arranged in the same parallel state as when the battery module is completed on a conveyor (not shown) such as a belt conveyor.
  • the plurality of battery cells 1 arranged in a parallel state are transported by the transport device to an operation region of the welding device 20 (hereinafter referred to as a welding area).
  • the welding apparatus of this embodiment is a laser welding apparatus, for example.
  • a bus bar automatic supply device (not shown) arranged adjacent to the welding device 20 receives the bus bar 5 by a holding body configured to hold the bus bar 5. .
  • the automatic bus bar supply device arranges the received bus bar 5 so as to straddle the external terminals 4 and 4 of the adjacent battery cells 1 and 1.
  • the welding head 21 that emits the laser light L moves along the inner side surface portion 8 a of the bus bar 5.
  • the welding head 21 emits the laser light L toward a portion of the inner side surface portion 8a on the external terminal 4 side so that the optical axis of the laser light L intersects the inner side surface portion 8a in an inclined state.
  • the laser beam L is irradiated such that a portion on the inner side surface portion 8a side is a focal position rather than the boundary between the inner side surface portion 8a and the external terminal 4.
  • the range W irradiated with the laser light L is the entire circumference of the inner side surface portion 8a.
  • the part W of the circumferential direction in the inner surface part 8a may be sufficient as the range W to which the laser beam L is irradiated.
  • the connection portion 7 of the bus bar 5 and the flat surface 4b of the external terminal 4 are welded.
  • a part of the melted inner side surface portion 8 a flows toward the inside of the through hole 8.
  • the connecting portion 7 of the bus bar 5 and the external terminal 4 are welded by the welding device 20
  • the bus bar 5 is electrically and mechanically connected to the external terminal 4 of the battery cell 1.
  • the plurality of battery cells 1,... Electrically connected via the bus bar 5 are accommodated in the housing 10. Thereby, a large capacity battery (battery module) is completed.
  • the external terminal 4 side portion of the inner side surface portion 8a provided in the connection portion 7 of the bus bar 5 and the external terminal 4 are welded.
  • heat amount for welding becomes small. Therefore, the thermal damage of the external terminal 4 can be reduced, and as a result, the thermal damage of the electrode body which is an internal structure can be reduced.
  • the external terminal 4 can also be prevented from being thermally deformed, it is possible to prevent a decrease in sealing performance inside the battery cell 1 due to deformation of the external terminal 4.
  • the entire circumference (or part of the circumferential direction) of the inner side surface portion 8a and the external terminal 4 are welded. Thereby, the bus bar 5 and the external terminal 4 are reliably connected electrically and mechanically.
  • the power storage device and the welding method according to the present invention are not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention. Moreover, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.
  • a portion of the inner side surface portion 8 a that defines the through hole 8 that overlaps the shaft portion 4 a in the axial direction of the shaft portion 4 a of the external terminal 4 is welded to the external terminal 4.
  • the inner side surface portion 8a that defines the through hole 8 extends from the shaft portion 4a of the external terminal 4 to the shaft portion 4a. It may be welded to a place separated in a direction intersecting the axis.
  • the through hole 8 is arranged at a position overlapping in the axial direction with respect to a position away from the shaft portion 4 a in the external terminal 4 in the direction intersecting the axis of the shaft portion 4 a. May be. According to such a configuration, thermal damage to the shaft portion 4a can be prevented, and thus thermal damage to the electrode body that is the internal structure can be prevented.
  • the through holes 8 and 8 shown in FIG. 9 are arranged so as to sandwich the shaft portion 4 a in the short direction of the bus bar 5.
  • the through-hole 8 shown in FIG. 10 is separated from the shaft portion 4 a by being disposed closer to the center portion in the longitudinal direction of the bus bar 5.
  • the shaft portion 4a and the plate-like body 4c fitted to the shaft portion 4a are constituted by different members.
  • the shaft portion 4a is made of, for example, copper
  • the plate-like body 4c is made of, for example, an aluminum-based metal material such as aluminum or an aluminum alloy.
  • the plurality of battery cells 1 of the above embodiment are arranged in parallel so as to be arranged in the short direction of the cover plate 2b
  • the present invention is not limited to this configuration.
  • the plurality of battery cells 1,... May be arranged in parallel so as to be aligned in the longitudinal direction of the cover plate 2b.
  • the positive external terminal 4 disposed at one end in the longitudinal direction of the cover plate 2b and the negative external terminal 4 disposed at the other end in the longitudinal direction of the cover plate 2b are the positive electrodes.
  • the welding head 21 is configured to move (shake the neck), but the configuration is not limited to this.
  • the mirror may be configured to change the optical axis of the laser beam L emitted from the welding head 21, and the workpiece (power storage element) may move relative to the welding head 21 that is fixed.
  • the laser beam L is irradiated so that the optical axis of the laser beam L emitted from the welding head 21 intersects the flat surface 4b of the external terminal 4 in an inclined state.
  • the laser beam L is irradiated to the inner side surface portion 8 a so that the optical axis of the laser beam L is inclined with respect to the inner side surface portion 8 a of the through hole 8.
  • the inner side surface portion 8 a that defines the through hole 8 is arranged to be inclined with respect to the flat surface 5 a of the bus bar 5.
  • the optical axis of the laser beam L is directed to the inner side surface portion 8a. You may irradiate the laser beam L so that it may incline.
  • the external terminal 4 and the bus bar 5 of the said embodiment are comprised with the aluminum-type metal material, it is not limited to this.
  • the external terminal 4 and the bus bar 5 may be a metal material (including an alloy) such as copper, SUS, or steel. That is, the external terminals 4 and the bus bars 5 may be metal materials that are conductive and can be welded to each other.
  • the bus bar 5 and the external terminal 4 of the battery cell 1 are connected by laser welding, but the present invention is not limited to this.
  • the bus bar 5 and the external terminal 4 may be connected by general arc welding, gas welding, or the like.
  • the present invention can also be applied to various secondary batteries, other primary batteries, and capacitors such as electric double layer capacitors.
  • the type and size (capacity) of the battery are arbitrary.
  • SYMBOLS 1 Battery cell (electric storage element), 2 ... Case, 2a ... Case main body, 2b ... Cover body, 3 ... External gasket, 4 ... External terminal, 4a ... Shaft part, 4b ... Flat surface, 4c ... Plate-shaped body, 5 ... Bus bar, 5A ... Bus bar (for external connection), 5a ... Flat surface, 6 ... Body part, 7 ... Connection part, 8 ... Through hole, 8a ... Inside surface part, 10 ... Housing, 20 ... Welding device, 21 ... Welding Head, L ... Laser light

Abstract

This electricity storage device is provided with: an electricity storage element that has an external terminal; and a bus bar that has a connection part and is connected to the external terminal by means of the connection part. The connection part of the bus bar has a through hole, and the inner surface that defines the through hole is welded to the external terminal.

Description

蓄電装置及び溶接方法Power storage device and welding method 関連出願の相互参照Cross-reference of related applications
　本願は、日本国特願２０１２－２１４０６５号の優先権を主張し、日本国特願２０１２－２１４０６５号の内容は、引用によって本願明細書の記載に組み込まれる。 This application claims the priority of Japanese Patent Application No. 2012-214065, and the content of Japanese Patent Application No. 2012-214065 is incorporated into the description of this application by reference.
　本発明は、外部端子を有する蓄電素子と、外部端子に接続されるバスバーとを備える蓄電装置に関する。また、本発明は、蓄電素子の外部端子とバスバーとの溶接方法に関する。 The present invention relates to a power storage device including a power storage element having an external terminal and a bus bar connected to the external terminal. The present invention also relates to a method for welding an external terminal of a power storage element and a bus bar.
　近年、電池（リチウムイオン電池、ニッケル水素電池等）、キャパシタ（電気二重層キャパシタ等）といった充放電可能な蓄電素子が車両（自動車、自動二輪車等）、各種機器（携帯端末、ノート型パソコン等）の動力源として採用されている。例えば、電池には、種々のタイプのものが提供されている。その一つとして、複数の電池セルの外部端子同士を導電性のバスバーで接続し、一つの電池として構成した電池モジュールが提供されている（特許文献１）。 In recent years, chargeable / dischargeable storage elements such as batteries (lithium ion batteries, nickel metal hydride batteries, etc.) and capacitors (electric double layer capacitors, etc.) are used in vehicles (automobiles, motorcycles, etc.) and various devices (mobile terminals, notebook computers, etc.). It has been adopted as a power source. For example, various types of batteries are provided. As one of them, there is provided a battery module in which external terminals of a plurality of battery cells are connected by a conductive bus bar and configured as one battery (Patent Document 1).
　ところで、斯かる電池モジュールにおいて、複数の電池セルの外部端子同士をバスバーで接続するために、外部端子とバスバーとがレーザ溶接されている。このとき、レーザ光がバスバーの上部から照射される。このため、板状であるバスバーを厚み方向に溶かすだけの熱量が必要となる。したがって、外部端子の熱損傷、さらには、電池セルの内部構造である電極体の熱損傷が大きくなる。 Incidentally, in such a battery module, the external terminals and the bus bar are laser-welded in order to connect the external terminals of the plurality of battery cells with the bus bar. At this time, laser light is irradiated from the upper part of the bus bar. For this reason, the amount of heat required to melt the plate-like bus bar in the thickness direction is required. Therefore, the thermal damage of the external terminal, and further the thermal damage of the electrode body that is the internal structure of the battery cell are increased.
日本国特開２０１２－４３７１４号公報Japanese Unexamined Patent Publication No. 2012-43714
　よって、本発明は、かかる事情に鑑み、蓄電素子の外部端子への熱損傷を軽減することができる蓄電装置、及び蓄電素子の外部端子とバスバーとの溶接方法を提供することを課題とする。 Therefore, in view of such circumstances, an object of the present invention is to provide a power storage device that can reduce thermal damage to the external terminal of the power storage element, and a method for welding the external terminal of the power storage element and the bus bar.
　本発明に係る蓄電装置は、
　外部端子を有する蓄電素子と、
　接続部を有し、該接続部にて外部端子に接続されるバスバーとを備え、
　該バスバーの接続部は、貫通孔を有し、
　該貫通孔を画定する内側面部と、外部端子と、が溶接されている。 The power storage device according to the present invention includes:
A storage element having an external terminal;
A bus bar having a connection portion and connected to an external terminal at the connection portion;
The connecting portion of the bus bar has a through hole,
The inner side surface part which defines this through-hole, and the external terminal are welded.
　本発明に係る蓄電装置の一態様として、
　貫通孔を画定する内側面部の外部端子側と、外部端子と、が溶接されている、
　ようにしてもよい。 As one aspect of the power storage device according to the present invention,
The external terminal side of the inner side surface part defining the through hole and the external terminal are welded,
You may do it.
　また、本発明に係る蓄電装置の他態様として、
　前記内側面部における周方向の一部又は前記内側面部の全周と、外部端子とが溶接されている、
　ようにしてもよい。 Further, as another aspect of the power storage device according to the present invention,
A part of the inner surface portion in the circumferential direction or the entire circumference of the inner surface portion and the external terminal are welded,
You may do it.
　また、本発明に係る蓄電装置の別の態様として、
　外部端子は、蓄電素子内に挿入される軸部を有し、
　貫通孔を画定する内側面部と、外部端子のうちの軸部の軸心と交差する方向に当該軸部から離れた箇所と、が溶接されている、
　ようにしてもよい。 Further, as another aspect of the power storage device according to the present invention,
The external terminal has a shaft portion inserted into the power storage element,
The inner side surface part that defines the through hole and the part that is away from the shaft part in a direction intersecting the axis of the shaft part of the external terminals are welded,
You may do it.
　この場合、
　貫通孔は、外部端子のうちの軸部から当該軸部の軸心と交差する方向に離れた箇所に対して軸心方向に重なる位置に配置されている、
　ようにしてもよい。 in this case,
The through hole is arranged at a position overlapping the axial direction with respect to a location away from the axial portion of the external terminal in the direction intersecting the axial center of the axial portion.
You may do it.
　本発明に係る蓄電素子の外部端子とバスバーとの溶接方法は、
　外部端子を有する蓄電素子の当該外部端子とバスバーとを溶接する方法であって、
　外部端子と、バスバーに形成された貫通孔を画定する内側面部とが接触する境界線よりも内側面部側に向けてレーザ光を照射して、内側面部と外部端子とを溶接する。 The welding method of the external terminal and the bus bar of the electricity storage device according to the present invention,
A method of welding the external terminal and the bus bar of the electricity storage device having the external terminal,
Laser light is irradiated toward the inner side surface from the boundary line between the external terminal and the inner side surface defining the through hole formed in the bus bar, and the inner side surface and the external terminal are welded.
図１は、本発明の一実施形態に係る電池モジュールの斜視図を示す。FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention. 図２は、同電池モジュールの平面図を示す。FIG. 2 shows a plan view of the battery module. 図３は、同電池モジュールを構成する電池セルの斜視図を示す。FIG. 3 shows a perspective view of a battery cell constituting the battery module. 図４は、同電池セル同士を接続するためのバスバーの斜視図を示す。FIG. 4 shows a perspective view of a bus bar for connecting the battery cells. 図５は、同バスバーの図４のＶ－Ｖ線拡大断面図を示す。5 shows an enlarged cross-sectional view of the bus bar taken along line VV of FIG. 図６は、同バスバーが外部端子に溶接される状態の一部拡大断面図を示す。FIG. 6 shows a partially enlarged cross-sectional view of the bus bar welded to the external terminal. 図７は、同バスバーが外部端子に溶接される箇所の一態様を表す平面図を示す。FIG. 7 is a plan view showing an aspect of a place where the bus bar is welded to the external terminal. 図８は、同バスバーが外部端子に溶接される箇所の他態様を表す平面図を示す。FIG. 8 is a plan view showing another aspect of the place where the bus bar is welded to the external terminal. 図９は、本発明の他の実施形態に係る電池モジュールの一部平面図を示す。FIG. 9 shows a partial plan view of a battery module according to another embodiment of the present invention. 図１０は、本発明のさらに他の実施形態に係る電池モジュールの一部拡大断面図を示す。FIG. 10 is a partially enlarged cross-sectional view of a battery module according to still another embodiment of the present invention. 図１１は、本発明のさらに他の実施形態に係る電池モジュールの一部平面図を示す。FIG. 11 is a partial plan view of a battery module according to still another embodiment of the present invention. 図１２は、同電池モジュールの図１１のＸII－ＸII線拡大断面図を示す。12 shows an enlarged cross-sectional view of the battery module taken along line XII-XII of FIG.
　本発明に係る蓄電装置は、
　外部端子を有する蓄電素子と、
　接続部を有し、該接続部にて外部端子に接続されるバスバーとを備え、
　該バスバーの接続部は、貫通孔を有し、
　該貫通孔を画定する内側面部と、外部端子と、が溶接されている。 The power storage device according to the present invention includes:
A storage element having an external terminal;
A bus bar having a connection portion and connected to an external terminal at the connection portion;
The connecting portion of the bus bar has a through hole,
The inner side surface part which defines this through-hole, and the external terminal are welded.
　かかる構成によれば、バスバーの接続部の貫通孔を画定する内側面部と、外部端子と、が溶接されている。これにより、バスバーを厚み方向全体に溶かしてバスバーと外部端子とを溶接する構成と比較して、溶接するための熱量が小さくなる。したがって、外部端子の熱損傷を軽減することができる。 According to such a configuration, the inner side surface portion that defines the through hole of the connection portion of the bus bar and the external terminal are welded. Thereby, compared with the structure which melts a bus bar to the whole thickness direction and welds a bus bar and an external terminal, the calorie | heat amount for welding becomes small. Therefore, the thermal damage of the external terminal can be reduced.
　ここで、本発明に係る蓄電装置の一態様として、
　貫通孔を画定する内側面部の外部端子側と、外部端子と、が溶接されている、
　ようにしてもよい。 Here, as one aspect of the power storage device according to the present invention,
The external terminal side of the inner side surface part defining the through hole and the external terminal are welded.
You may do it.
　かかる構成によれば、貫通孔を画定する内側面部の外部端子側と、外部端子とが溶接されている。これにより、溶接するための熱量がさらに小さくなるため、外部端子の熱損傷をさらに軽減することができる。 According to such a configuration, the external terminal side of the inner side surface portion defining the through hole and the external terminal are welded. Thereby, since the amount of heat for welding is further reduced, thermal damage to the external terminals can be further reduced.
　また、本発明に係る蓄電装置の他態様として、
　内側面部における周方向の一部又は内側面部の全周と、外部端子とが溶接されている、
　ようにしてもよい。 Further, as another aspect of the power storage device according to the present invention,
A part of the inner surface portion in the circumferential direction or the entire circumference of the inner surface portion and the external terminal are welded,
You may do it.
　かかる構成によれば、内側面部における周方向の一部又は内側面部の全周と、外部端子とが溶接されている。これにより、バスバーと外部端子とを、電気的及び機械的に確実に接続することができる。 According to such a configuration, a part of the inner surface portion in the circumferential direction or the entire periphery of the inner surface portion and the external terminal are welded. Thereby, a bus bar and an external terminal can be reliably connected electrically and mechanically.
　また、本発明に係る蓄電装置の別の態様として、
　外部端子は、蓄電素子内に挿入される軸部を有し、
　貫通孔を画定する内側面部と、外部端子のうちの軸部の軸心と交差する方向に当該軸部から離れた箇所とが溶接されている、
　ようにしてもよい。 Further, as another aspect of the power storage device according to the present invention,
The external terminal has a shaft portion inserted into the power storage element,
The inner side surface part that defines the through hole and the part away from the shaft part in the direction intersecting the axis of the shaft part of the external terminals are welded.
You may do it.
　かかる構成によれば、蓄電素子内に挿入される軸部が外部端子に設けられている。そして、外部端子における軸部の軸心と交差する方向に当該軸部から離れた箇所と、貫通孔を画定する内側面部とが溶接されている。これにより、軸部の熱損傷を防止でき、その結果、内部構造である電極体の熱損傷を防止できる。 According to such a configuration, the shaft portion inserted into the power storage element is provided in the external terminal. And the location away from the said axial part in the direction which cross | intersects the axial center of the axial part in an external terminal and the inner surface part which demarcates a through-hole are welded. Thereby, the thermal damage of a shaft part can be prevented, and as a result, the thermal damage of the electrode body which is an internal structure can be prevented.
　この場合、
　貫通孔は、外部端子のうちの軸部から当該軸部の軸心と交差する方向に離れた箇所に対して軸心方向に重なる位置に配置されている、
　ようにしてもよい。 in this case,
The through hole is arranged at a position overlapping the axial direction with respect to a location away from the axial portion of the external terminal in the direction intersecting the axial center of the axial portion.
You may do it.
　かかる構成によれば、貫通孔は、軸部から当該軸部の軸心と交差する方向に離れた箇所に対して軸心方向に重なる位置に配置されている。これにより、軸部の熱損傷をさらに効果的に防止できるため、内部構造である電極体の熱損傷をさらに効果的に防止できる。 According to such a configuration, the through hole is arranged at a position overlapping in the axial direction with respect to a location away from the axial portion in a direction intersecting with the axial center of the axial portion. Thereby, since the thermal damage of a shaft part can be prevented more effectively, the thermal damage of the electrode body which is an internal structure can be prevented more effectively.
　本発明に係る蓄電素子の外部端子とバスバーとの溶接方法は、
　外部端子を有する蓄電素子の当該外部端子とバスバーとを溶接する方法であって、
　外部端子と、バスバーに形成された貫通孔を画定する内側面部と、が接触する境界線よりも内側面部側に向けてレーザ光を照射して、内側面部と外部端子とを溶接する。 The welding method of the external terminal and the bus bar of the electricity storage device according to the present invention,
A method of welding the external terminal and the bus bar of the electricity storage device having the external terminal,
Laser light is irradiated toward the inner side surface side from the boundary line where the external terminal and the inner side surface portion defining the through hole formed in the bus bar come into contact, and the inner side surface portion and the external terminal are welded.
　かかる方法では、外部端子と、バスバーの接続部に設けられた貫通孔を画定する内側面部と、が接触する境界線よりも内側面部側に向けてレーザ光を照射する。これにより、外部端子と、貫通孔を画定する内側面部とが溶接される。このため、レーザ光をバスバーの上部から照射してバスバーを厚み方向全体に溶かすことでバスバーと外部端子とを溶接する方法と比較して、溶接するための熱量が小さくなる。したがって、外部端子の熱損傷を軽減することができる。 In such a method, the laser beam is irradiated toward the inner side surface side from the boundary line where the external terminal and the inner side surface portion defining the through hole provided in the connection portion of the bus bar contact. Thereby, an external terminal and the inner surface part which demarcates a through-hole are welded. For this reason, compared with the method of welding a bus bar and an external terminal by irradiating a laser beam from the upper part of a bus bar and melting a bus bar to the whole thickness direction, the calorie | heat amount for welding becomes small. Therefore, the thermal damage of the external terminal can be reduced.
　以上の如く、本発明によれば、蓄電素子の外部端子の熱損傷を軽減することができるという優れた効果を奏する。 As described above, according to the present invention, there is an excellent effect that it is possible to reduce the thermal damage of the external terminal of the electric storage element.
　以下、本発明に係る蓄電装置の一実施形態である電池モジュールについて、図面を参酌しつつ説明する。本実施形態に係る電池モジュールは、図１及び図２に示す如く、複数の電池セル（蓄電素子）１，…と、該複数の電池セル１，…を収容するハウジング１０とを備えている。 Hereinafter, a battery module which is an embodiment of a power storage device according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the battery module according to the present embodiment includes a plurality of battery cells (storage elements) 1,... And a housing 10 that houses the plurality of battery cells 1.
　電池セル１は、図３に示す如く、ケース２を備えている。ケース２は、開口部を有するケース本体２ａと、該ケース本体２ａの開口部を塞いで密閉する蓋板２ｂとを有する。電極体（図示せず）は、ケース２内に収容されている。 The battery cell 1 includes a case 2 as shown in FIG. The case 2 includes a case main body 2a having an opening and a lid plate 2b that closes and seals the opening of the case main body 2a. An electrode body (not shown) is accommodated in the case 2.
　電池セル１は、外観直方体状の角形電池や、外観円柱状の丸形電池を採用し得る。本実施形態に係る電池セル１は、角形電池である。そのため、ケース本体２ａは、幅方向に偏平な有底角筒状である。また、蓋板２ｂは、該ケース本体２ａの開口部に対応した長方形状の板材である。 The battery cell 1 can employ a rectangular battery having a rectangular parallelepiped appearance or a round battery having a cylindrical appearance. The battery cell 1 which concerns on this embodiment is a square battery. Therefore, the case body 2a has a bottomed rectangular tube shape that is flat in the width direction. The lid plate 2b is a rectangular plate material corresponding to the opening of the case body 2a.
　外部ガスケット３は、ケース２の外面、より詳しくは、蓋板２ｂの外面に配置されている。そして、外部端子４は、外部ガスケット３の外面に配置されている。本実施形態においては、外部ガスケット３が凹部を有しており、外部端子４が該凹部内に配置されている。 The external gasket 3 is disposed on the outer surface of the case 2, more specifically, on the outer surface of the cover plate 2b. The external terminal 4 is disposed on the outer surface of the external gasket 3. In the present embodiment, the external gasket 3 has a recess, and the external terminal 4 is disposed in the recess.
　外部端子４は、例えば、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料で形成されている。ここで、貫通開口（図示しない）が蓋板２ｂに形成されている。また、貫通開口（図６参照）は、外部ガスケット３にも形成されている。外部ガスケット３は、当該外部ガスケット３の貫通開口が蓋板２ｂの貫通開口と一致するようにして蓋板２ｂの外面に配置されている。外部端子４は、それら貫通開口を貫通する軸部４ａ（図６参照）を有している。二つの貫通開口を通じて外部ガスケット３及び蓋板２ｂを貫通した外部端子４の軸部４ａは、集電体（図示しない）に接続されている。この集電体は、電極体に接続されている。これにより、外部端子４は、電極体に電気的に接続されている。 The external terminal 4 is made of, for example, an aluminum-based metal material such as aluminum or an aluminum alloy. Here, a through opening (not shown) is formed in the lid plate 2b. The through opening (see FIG. 6) is also formed in the external gasket 3. The external gasket 3 is arranged on the outer surface of the cover plate 2b so that the through-opening of the external gasket 3 coincides with the through-opening of the cover plate 2b. The external terminal 4 has a shaft portion 4a (see FIG. 6) that passes through these through openings. A shaft portion 4a of the external terminal 4 penetrating the external gasket 3 and the cover plate 2b through the two through openings is connected to a current collector (not shown). This current collector is connected to the electrode body. Thereby, the external terminal 4 is electrically connected to the electrode body.
　正極用の外部ガスケット３及び外部端子４と、負極用の外部ガスケット３及び外部端子４とが電池セル１に設けられている。正極用の外部ガスケット３及び外部端子４は、蓋板２ｂの長手方向における一端部に配置されている。負極用の外部ガスケット３及び外部端子４は、蓋板２ｂの長手方向における他端部に配置されている。外部ガスケット３及び外部端子４は、平面視長方形状である。外部ガスケット３及び外部端子４は、蓋板２ｂの幅方向の寸法が小さく且つ前記幅方向と直交する方向の寸法が小さな長方形状を有する。 The external gasket 3 and the external terminal 4 for the positive electrode and the external gasket 3 and the external terminal 4 for the negative electrode are provided in the battery cell 1. The external gasket 3 and the external terminal 4 for the positive electrode are disposed at one end in the longitudinal direction of the lid plate 2b. The external gasket 3 and the external terminal 4 for the negative electrode are disposed at the other end in the longitudinal direction of the lid plate 2b. The external gasket 3 and the external terminal 4 have a rectangular shape in plan view. The external gasket 3 and the external terminal 4 have a rectangular shape in which the dimension in the width direction of the cover plate 2b is small and the dimension in the direction orthogonal to the width direction is small.
　外部端子４の上部は、平坦面４ｂである。外部端子４が平面視長方形状であるので、平坦面４ｂも長方形状である。外部端子４の平坦面４ｂは、蓋板２ｂの外面から離れている。外部端子４の平坦面４ｂは、外部ガスケット３から突出している。正極用の外部端子４の平坦面４ｂと、負極用の外部端子４の平坦面４ｂとは、蓋板２ｂの外面に対して同じ高さ位置にある。 The upper part of the external terminal 4 is a flat surface 4b. Since the external terminal 4 is rectangular in plan view, the flat surface 4b is also rectangular. The flat surface 4b of the external terminal 4 is separated from the outer surface of the cover plate 2b. The flat surface 4 b of the external terminal 4 protrudes from the external gasket 3. The flat surface 4b of the external terminal 4 for positive electrode and the flat surface 4b of the external terminal 4 for negative electrode are at the same height position with respect to the outer surface of the cover plate 2b.
　図１及び図２に戻り、複数の電池セル１，…は、蓋板２ｂの短手方向に並ぶように並列配置されている。本実施形態においては、１０個の電池セル１，…が並列配置されている。また、隣り合う電池セル１，１は、極性が反対となるように配置されている。これにより、隣り合う外部端子４，４を接続することで、全ての電池セル１が直列接続され、一つの電池が構成される。 Referring back to FIGS. 1 and 2, the plurality of battery cells 1,... Are arranged in parallel so as to be aligned in the short direction of the cover plate 2b. In this embodiment, ten battery cells 1 are arranged in parallel. Adjacent battery cells 1 and 1 are arranged so that the polarities are opposite. Thereby, by connecting the adjacent external terminals 4 and 4, all the battery cells 1 are connected in series, and one battery is comprised.
　蓋板２ｂの短手方向に並ぶ電池セル１，１の外部端子４，４同士は、バスバー５によって接続されている。より詳しくは、隣り合う電池セル１，１のうちの一方の電池セル１の正極用の外部端子４と、前記隣り合う電池セル１，１のうちの他方の電池セル１の負極用の外部端子４とは、近接している。そして、これらの外部端子４，４同士がバスバー５によって接続されている。 The external terminals 4 and 4 of the battery cells 1 and 1 arranged in the short direction of the cover plate 2 b are connected by a bus bar 5. More specifically, the external terminal 4 for the positive electrode of one of the adjacent battery cells 1, 1 and the external terminal for the negative electrode of the other battery cell 1 of the adjacent battery cells 1, 1. 4 is close. These external terminals 4 and 4 are connected to each other by a bus bar 5.
　なお、外部接続用のバスバー５Ａが、直列接続された複数の電池セル１のうちの一端の電池セル１の外部端子４と、前記直列接続された複数の電池セル１のうちの他端の電池セル１の外部端子４とに、それぞれ接続されている。かかるバスバー５Ａは、別の電池モジュール、別の機器、負荷、又は電源に接続される外部接続用のバスバーである。 Note that an external connection bus bar 5A includes an external terminal 4 of the battery cell 1 at one end of the plurality of battery cells 1 connected in series and a battery at the other end of the plurality of battery cells 1 connected in series. Each is connected to an external terminal 4 of the cell 1. The bus bar 5A is an external connection bus bar connected to another battery module, another device, a load, or a power source.
　バスバー５は、図４及び図５に示す如く、本体部６と、該本体部６の両端に設けられる一対の接続部７，７とを有している。接続部７は、外部端子４の平坦面４ｂに載置され、外部端子４に接続される部分である。本体部６は、一対の接続部７，７を連結している。本実施形態において、バスバー５は、平坦面５ａを有して平面視長方形状の平板状に形成されている。このバスバー５は、例えば、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料の板材によって形成されている。 As shown in FIGS. 4 and 5, the bus bar 5 includes a main body portion 6 and a pair of connection portions 7 and 7 provided at both ends of the main body portion 6. The connection portion 7 is a portion that is placed on the flat surface 4 b of the external terminal 4 and connected to the external terminal 4. The main body 6 connects a pair of connecting portions 7 and 7. In the present embodiment, the bus bar 5 has a flat surface 5a and is formed in a flat plate shape that is rectangular in plan view. The bus bar 5 is formed of, for example, a plate material made of an aluminum-based metal material such as aluminum or an aluminum alloy.
　貫通孔８が接続部７に設けられている。本実施形態の貫通孔８は、平面視矩形状（正方形状）に形成されている。また、この貫通孔８は、貫通方向の各位置において同じ大きさとなるように、接続部７を貫通している。したがって、貫通孔８を画定する（囲う）内側面部８ａは、バスバー５の平坦面５ａと直交する。なお、貫通孔８は、平面視矩形状に限られない。例えば、貫通孔８は、平面視において、円形状（真円形状、楕円形状）、多角形状等でもよい。また、後述するが、外部端子４とバスバー５とを電気的及び機械的に接続するために、貫通孔８を画定する内側面部８ａと外部端子４とが溶接される。具体的には、内側面部８ａにおける外部端子４側の部位と、外部端子４と、が溶接される。 A through hole 8 is provided in the connecting portion 7. The through hole 8 of the present embodiment is formed in a rectangular shape (square shape) in plan view. Moreover, this through-hole 8 has penetrated the connection part 7 so that it may become the same magnitude | size in each position of a penetration direction. Therefore, the inner side surface portion 8 a that defines (encloses) the through hole 8 is orthogonal to the flat surface 5 a of the bus bar 5. The through hole 8 is not limited to a rectangular shape in plan view. For example, the through hole 8 may have a circular shape (perfect circular shape, elliptical shape), a polygonal shape, or the like in plan view. Further, as will be described later, in order to electrically and mechanically connect the external terminal 4 and the bus bar 5, the inner side surface portion 8a that defines the through hole 8 and the external terminal 4 are welded. Specifically, the external terminal 4 side portion of the inner side surface portion 8a and the external terminal 4 are welded.
　ここで、電池セル１に対するバスバー５の接続方法（電池モジュール１の製造方法）について説明する。 Here, a method for connecting the bus bar 5 to the battery cell 1 (a method for manufacturing the battery module 1) will be described.
　まず、複数の電池セル１，…は、ベルトコンベア等の搬送装置（図示しない）上で電池モジュールの完成時と同じ並列状態に配置される。並列状態に配置された複数の電池セル１，…は、該搬送装置によって溶接装置２０の作動領域（以下、溶接エリアという）に搬送される。なお、本実施形態の溶接装置は、例えば、レーザ溶接装置である。複数の電池セル１，…が溶接エリアに到達すると、溶接装置２０に隣接して配置されるバスバー自動供給装置（図示しない）は、バスバー５を保持可能に構成された保持体によってバスバー５を受け取る。そして、バスバー自動供給装置は、図６に示す如く、受け取ったバスバー５を隣り合う電池セル１，１の外部端子４，４に跨るように配置する。 First, the plurality of battery cells 1,... Are arranged in the same parallel state as when the battery module is completed on a conveyor (not shown) such as a belt conveyor. The plurality of battery cells 1 arranged in a parallel state are transported by the transport device to an operation region of the welding device 20 (hereinafter referred to as a welding area). In addition, the welding apparatus of this embodiment is a laser welding apparatus, for example. When the plurality of battery cells 1 reach the welding area, a bus bar automatic supply device (not shown) arranged adjacent to the welding device 20 receives the bus bar 5 by a holding body configured to hold the bus bar 5. . Then, as shown in FIG. 6, the automatic bus bar supply device arranges the received bus bar 5 so as to straddle the external terminals 4 and 4 of the adjacent battery cells 1 and 1.
　そして、保持体がバスバー５を外部端子４に押し付けた状態で、レーザ光Ｌを出射する溶接ヘッド２１がバスバー５の内側面部８ａに沿って移動する。このとき、溶接ヘッド２１は、レーザ光Ｌの光軸が内側面部８ａに対して傾斜状態で交差するように、内側面部８ａにおける外部端子４側の部位に向けてレーザ光Ｌを出射する。具体的には、レーザ光Ｌは、内側面部８ａと外部端子４との境界よりも、やや内側面部８ａ側の部位が焦点位置となるように照射されている。また、本実施形態において、図７に示す如く、レーザ光Ｌを照射する範囲Ｗは、内側面部８ａの全周である。なお、レーザ光Ｌを照射する範囲Ｗは、図８に示す如く、内側面部８ａにおける周方向の一部でもよい。 Then, with the holding body pressing the bus bar 5 against the external terminal 4, the welding head 21 that emits the laser light L moves along the inner side surface portion 8 a of the bus bar 5. At this time, the welding head 21 emits the laser light L toward a portion of the inner side surface portion 8a on the external terminal 4 side so that the optical axis of the laser light L intersects the inner side surface portion 8a in an inclined state. Specifically, the laser beam L is irradiated such that a portion on the inner side surface portion 8a side is a focal position rather than the boundary between the inner side surface portion 8a and the external terminal 4. Further, in the present embodiment, as shown in FIG. 7, the range W irradiated with the laser light L is the entire circumference of the inner side surface portion 8a. In addition, as shown in FIG. 8, the part W of the circumferential direction in the inner surface part 8a may be sufficient as the range W to which the laser beam L is irradiated.
　このように、溶接ヘッド２１がレーザ光Ｌを出射しつつ移動することで、バスバー５の接続部７と、外部端子４の平坦面４ｂとが溶接される。このとき、溶融した内側面部８ａの一部が、貫通孔８の内側に向けて流れる。そして、レーザー光Ｌの照射が終わると、そのままの状態で固まる。このように、溶接装置２０によってバスバー５の接続部７と外部端子４とが溶接されると、バスバー５は、電池セル１の外部端子４に対して電気的及び機械的に接続される。その後、バスバー５を介して電気的に接続された複数の電池セル１，…がハウジング１０に収容される。これにより、大容量の電池（電池モジュール）が完成する。 Thus, when the welding head 21 moves while emitting the laser beam L, the connection portion 7 of the bus bar 5 and the flat surface 4b of the external terminal 4 are welded. At this time, a part of the melted inner side surface portion 8 a flows toward the inside of the through hole 8. And when irradiation of the laser beam L is completed, it hardens as it is. As described above, when the connecting portion 7 of the bus bar 5 and the external terminal 4 are welded by the welding device 20, the bus bar 5 is electrically and mechanically connected to the external terminal 4 of the battery cell 1. Thereafter, the plurality of battery cells 1,... Electrically connected via the bus bar 5 are accommodated in the housing 10. Thereby, a large capacity battery (battery module) is completed.
　以上のように、本実施形態に係る電池モジュールでは、バスバー５の接続部７に設けられた内側面部８ａの外部端子４側の部位と、外部端子４と、が溶接されている。これにより、バスバー５を厚み方向全体に溶かしてバスバー５と外部端子４とを溶接する構成と比較して、溶接するための熱量が小さくなる。したがって、外部端子４の熱損傷を軽減することができ、その結果、内部構造である電極体の熱損傷を軽減することができる。また、外部端子４が熱変形することも防止できるため、外部端子４の変形に起因する電池セル１内部の密封性の低下も防止できる。 As described above, in the battery module according to the present embodiment, the external terminal 4 side portion of the inner side surface portion 8a provided in the connection portion 7 of the bus bar 5 and the external terminal 4 are welded. Thereby, compared with the structure which melts the bus-bar 5 to the whole thickness direction and welds the bus-bar 5 and the external terminal 4, the calorie | heat amount for welding becomes small. Therefore, the thermal damage of the external terminal 4 can be reduced, and as a result, the thermal damage of the electrode body which is an internal structure can be reduced. Moreover, since the external terminal 4 can also be prevented from being thermally deformed, it is possible to prevent a decrease in sealing performance inside the battery cell 1 due to deformation of the external terminal 4.
　また、本実施形態に係る電池モジュールによれば、内側面部８ａの全周（又は、周方向の一部）と、外部端子４とが溶接されている。これにより、バスバー５と外部端子４とが、電気的及び機械的に、確実に接続される。 Further, according to the battery module of the present embodiment, the entire circumference (or part of the circumferential direction) of the inner side surface portion 8a and the external terminal 4 are welded. Thereby, the bus bar 5 and the external terminal 4 are reliably connected electrically and mechanically.
　なお、本発明に係る蓄電装置及び溶接方法は、上記した実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。また、下記する各種の変更例に係る構成や方法等を任意に選択して、上記した実施形態に係る構成や方法等に採用してもよいことは勿論である。 It should be noted that the power storage device and the welding method according to the present invention are not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention. Moreover, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.
　上記実施形態においては、貫通孔８を画定する内側面部８ａにおいて、外部端子４の軸部４ａの軸心方向における軸部４ａと重なる箇所が、外部端子４と溶接される。しかしながら、他の実施形態を示す図９やさらに他の実施形態を示す図１０に示す如く、貫通孔８を画定する内側面部８ａは、外部端子４のうちの軸部４ａから当該軸部４ａの軸心と交差する方向に離れた箇所と溶接されてもよい。しかも、図９及び図１０に示す如く、貫通孔８は、外部端子４における軸部４ａから当該軸部４ａの軸心と交差する方向に離れた箇所に対して軸心方向に重なる位置に配置されてもよい。かかる構成によれば、軸部４ａの熱損傷を防止できるため、内部構造である電極体の熱損傷を防止できる。 In the above embodiment, a portion of the inner side surface portion 8 a that defines the through hole 8 that overlaps the shaft portion 4 a in the axial direction of the shaft portion 4 a of the external terminal 4 is welded to the external terminal 4. However, as shown in FIG. 9 showing another embodiment and FIG. 10 showing still another embodiment, the inner side surface portion 8a that defines the through hole 8 extends from the shaft portion 4a of the external terminal 4 to the shaft portion 4a. It may be welded to a place separated in a direction intersecting the axis. Moreover, as shown in FIGS. 9 and 10, the through hole 8 is arranged at a position overlapping in the axial direction with respect to a position away from the shaft portion 4 a in the external terminal 4 in the direction intersecting the axis of the shaft portion 4 a. May be. According to such a configuration, thermal damage to the shaft portion 4a can be prevented, and thus thermal damage to the electrode body that is the internal structure can be prevented.
　図９に示す貫通孔８，８は、バスバー５の短手方向において、軸部４ａを挟むように配置されている。図１０に示す貫通孔８は、バスバー５の長手方向において、中央部寄りに配置されることで、軸部４ａから離れている。図１０に示す負極用の外部端子４では、軸部４ａと、軸部４ａに嵌合される板状体４ｃとが別部材によって構成されている。具体的には、軸部４ａは、例えば、銅で形成されており、板状体４ｃは、例えば、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料で形成されている。 The through holes 8 and 8 shown in FIG. 9 are arranged so as to sandwich the shaft portion 4 a in the short direction of the bus bar 5. The through-hole 8 shown in FIG. 10 is separated from the shaft portion 4 a by being disposed closer to the center portion in the longitudinal direction of the bus bar 5. In the external terminal 4 for negative electrode shown in FIG. 10, the shaft portion 4a and the plate-like body 4c fitted to the shaft portion 4a are constituted by different members. Specifically, the shaft portion 4a is made of, for example, copper, and the plate-like body 4c is made of, for example, an aluminum-based metal material such as aluminum or an aluminum alloy.
　また、上記実施形態の複数の電池セル１，…は、蓋板２ｂの短手方向に並ぶようにして並列配置されていたが、この構成に限定されない。例えば、図１１及び図１２に示す如く、複数の電池セル１，…は、蓋板２ｂの長手方向に並ぶように並列配置されてもよい。そして、蓋板２ｂの長手方向における一端部に配置されている正極用の外部端子４と、蓋板２ｂの長手方向における他端部に配置されている負極用の外部端子４とは、これら正極用の外部端子４と負極用の外部端子４とに跨って配置されるバスバー５の内周面部８ａと溶接されることで、電気的に接続されている。 Moreover, although the plurality of battery cells 1 of the above embodiment are arranged in parallel so as to be arranged in the short direction of the cover plate 2b, the present invention is not limited to this configuration. For example, as shown in FIGS. 11 and 12, the plurality of battery cells 1,... May be arranged in parallel so as to be aligned in the longitudinal direction of the cover plate 2b. The positive external terminal 4 disposed at one end in the longitudinal direction of the cover plate 2b and the negative external terminal 4 disposed at the other end in the longitudinal direction of the cover plate 2b are the positive electrodes. Are electrically connected by welding to the inner peripheral surface portion 8a of the bus bar 5 disposed across the external terminal 4 for negative electrode and the external terminal 4 for negative electrode.
　また、上記実施形態の溶接装置２０では、溶接ヘッド２１が移動する（首を振る）ように構成されていたが、この構成に限定されない。例えば、ミラーが、溶接ヘッド２１から出射したレーザ光Ｌの光軸を変更する構成でもよく、また、ワーク（蓄電素子）が、固定されている溶接ヘッド２１に対して移動してもよい。 In the welding apparatus 20 of the above embodiment, the welding head 21 is configured to move (shake the neck), but the configuration is not limited to this. For example, the mirror may be configured to change the optical axis of the laser beam L emitted from the welding head 21, and the workpiece (power storage element) may move relative to the welding head 21 that is fixed.
　また、上記実施形態においては、溶接ヘッド２１から出射するレーザ光Ｌの光軸が外部端子４の平坦面４ｂに対して傾斜状態で交差するように、レーザ光Ｌが照射されている。これにより、レーザ光Ｌの光軸が貫通孔８の内側面部８ａに対して傾斜するように、レーザ光Ｌが内側面部８ａに照射される。しかし、この構成に限定されない。例えば、貫通孔８を画定する内側面部８ａが、バスバー５の平坦面５ａに対して傾斜するように配置される。このとき、溶接ヘッド２１から出射するレーザ光Ｌの光軸が外部端子４の平坦面４ｂと直交するようにレーザ光Ｌを照射することで、レーザ光Ｌの光軸が内側面部８ａに対して傾斜するようにレーザ光Ｌを照射してもよい。 In the above embodiment, the laser beam L is irradiated so that the optical axis of the laser beam L emitted from the welding head 21 intersects the flat surface 4b of the external terminal 4 in an inclined state. Thereby, the laser beam L is irradiated to the inner side surface portion 8 a so that the optical axis of the laser beam L is inclined with respect to the inner side surface portion 8 a of the through hole 8. However, it is not limited to this configuration. For example, the inner side surface portion 8 a that defines the through hole 8 is arranged to be inclined with respect to the flat surface 5 a of the bus bar 5. At this time, by irradiating the laser beam L so that the optical axis of the laser beam L emitted from the welding head 21 is orthogonal to the flat surface 4b of the external terminal 4, the optical axis of the laser beam L is directed to the inner side surface portion 8a. You may irradiate the laser beam L so that it may incline.
　また、上記実施形態の外部端子４及びバスバー５は、アルミニウム系金属材料で構成されているが、これに限定されない。例えば、外部端子４及びバスバー５は、銅、ＳＵＳ、スチール等の金属材料（合金を含む）であってもよい。すなわち、外部端子４及びバスバー５は、導電性を有し、互いに溶接可能な金属材料であればよい。 Moreover, although the external terminal 4 and the bus bar 5 of the said embodiment are comprised with the aluminum-type metal material, it is not limited to this. For example, the external terminal 4 and the bus bar 5 may be a metal material (including an alloy) such as copper, SUS, or steel. That is, the external terminals 4 and the bus bars 5 may be metal materials that are conductive and can be welded to each other.
　上記実施形態においては、レーザ溶接によってバスバー５と電池セル１の外部端子４とを接続したが、これに限定されない。例えば、一般的なアーク溶接、ガス溶接等によってバスバー５と外部端子４とを接続してもよい。 In the above embodiment, the bus bar 5 and the external terminal 4 of the battery cell 1 are connected by laser welding, but the present invention is not limited to this. For example, the bus bar 5 and the external terminal 4 may be connected by general arc welding, gas welding, or the like.
　本発明は、種々の二次電池、その他、一次電池や、電気二重層キャパシタ等のキャパシタにも適用可能である。そして、電池の種類や大きさ（容量）は任意である。 The present invention can also be applied to various secondary batteries, other primary batteries, and capacitors such as electric double layer capacitors. The type and size (capacity) of the battery are arbitrary.
　１…電池セル（蓄電素子）、２…ケース、２ａ…ケース本体、２ｂ…蓋体、３…外部ガスケット、４…外部端子、４ａ…軸部、４ｂ…平坦面、４ｃ…板状体、５…バスバー、５Ａ…（外部接続用の）バスバー、５ａ…平坦面、６…本体部、７…接続部、８…貫通孔、８ａ…内側面部、１０…ハウジング、２０…溶接装置、２１…溶接ヘッド、Ｌ…レーザ光 DESCRIPTION OF SYMBOLS 1 ... Battery cell (electric storage element), 2 ... Case, 2a ... Case main body, 2b ... Cover body, 3 ... External gasket, 4 ... External terminal, 4a ... Shaft part, 4b ... Flat surface, 4c ... Plate-shaped body, 5 ... Bus bar, 5A ... Bus bar (for external connection), 5a ... Flat surface, 6 ... Body part, 7 ... Connection part, 8 ... Through hole, 8a ... Inside surface part, 10 ... Housing, 20 ... Welding device, 21 ... Welding Head, L ... Laser light

Claims (6)

  1. 　外部端子を有する蓄電素子と、
    　接続部を有し、該接続部にて前記外部端子に接続されるバスバーとを備え、
    　該バスバーの接続部は、貫通孔を有し、
    　該貫通孔を画定する内側面部と、前記外部端子と、が溶接されている
    　蓄電装置。     A storage element having an external terminal;
    A connecting portion, and a bus bar connected to the external terminal at the connecting portion,
    The connecting portion of the bus bar has a through hole,
    The power storage device, wherein an inner side surface portion defining the through hole and the external terminal are welded.
  2. 　前記貫通孔を画定する前記内側面部の前記外部端子側と、前記外部端子と、が溶接されている
    　請求項１に記載の蓄電装置。     The power storage device according to claim 1, wherein the external terminal side of the inner side surface portion defining the through hole and the external terminal are welded.
  3. 　前記内側面部における周方向の一部又は前記内側面部の全周と、前記外部端子とが溶接されている
    　請求項１又は請求項２に記載の蓄電装置。     The power storage device according to claim 1 or 2, wherein a part of the inner side surface in the circumferential direction or the entire circumference of the inner side surface is welded to the external terminal.
  4. 　前記外部端子は、前記蓄電素子内に挿入される軸部を有し、
    　前記貫通孔を画定する前記内側面部と、前記外部端子のうちの前記軸部の軸心と交差する方向に当該軸部から離れた箇所と、が溶接されている
    　請求項１乃至請求項３のいずれか１項に記載の蓄電装置。     The external terminal has a shaft portion inserted into the power storage element,
    The inner side surface portion that defines the through hole and a portion of the external terminal that is separated from the shaft portion in a direction intersecting with the shaft center of the shaft portion are welded. The power storage device according to any one of claims.
  5. 　前記貫通孔は、前記外部端子のうちの前記軸部から当該軸部の軸心と交差する方向に離れた箇所に対して前記軸心方向に重なる位置に配置されている
    　請求項４に記載の蓄電装置。     The said through-hole is arrange | positioned in the position which overlaps with the said axial direction with respect to the location away in the direction which cross | intersects the axial center of the said axial part from the said axial part of the said external terminal. Power storage device.
  6. 　外部端子を有する蓄電素子の当該外部端子とバスバーとを溶接する方法であって、
    　前記外部端子と、前記バスバーに形成された貫通孔を画定する内側面部と、が接触する境界線よりも前記内側面部側に向けてレーザ光を照射して、前記内側面部と前記外部端子とを溶接する
    　蓄電素子の外部端子とバスバーとの溶接方法。     A method of welding the external terminal and the bus bar of the electricity storage device having the external terminal,
    Irradiating a laser beam toward the inner side surface side from the boundary line where the external terminal and the inner side surface portion defining the through hole formed in the bus bar contact, the inner side surface portion and the external terminal Welding A method of welding the external terminals of the storage element and the bus bar.
PCT/JP2013/071763 2012-09-27 2013-08-12 Electricity storage device and welding method WO2014050330A1 (en)

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JP2009087735A (en) * 2007-09-28 2009-04-23 Toshiba Corp Device for making connections between terminals
JP2009277605A (en) * 2008-05-16 2009-11-26 Eliiy Power Co Ltd Battery module
JP2012043714A (en) * 2010-08-20 2012-03-01 Toshiba Corp Welding method, battery and battery pack manufacturing method, and battery
WO2012120774A1 (en) * 2011-03-10 2012-09-13 三洋電機株式会社 Battery pack and method for connecting cells

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