WO2020158935A1 - Electrode tab forming method and electrode tab forming device - Google Patents

Electrode tab forming method and electrode tab forming device Download PDF

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Publication number
WO2020158935A1
WO2020158935A1 PCT/JP2020/003765 JP2020003765W WO2020158935A1 WO 2020158935 A1 WO2020158935 A1 WO 2020158935A1 JP 2020003765 W JP2020003765 W JP 2020003765W WO 2020158935 A1 WO2020158935 A1 WO 2020158935A1
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WO
WIPO (PCT)
Prior art keywords
electrode tab
punch
die
side electrode
bending
Prior art date
Application number
PCT/JP2020/003765
Other languages
French (fr)
Japanese (ja)
Inventor
孝明 戸枝
敬生 伊藤
Original Assignee
株式会社エンビジョンＡｅｓｃジャパン
日進精機株式会社
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Application filed by 株式会社エンビジョンＡｅｓｃジャパン, 日進精機株式会社 filed Critical 株式会社エンビジョンＡｅｓｃジャパン
Priority to JP2020568635A priority Critical patent/JP7374423B2/en
Publication of WO2020158935A1 publication Critical patent/WO2020158935A1/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
    • 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 of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—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 an electrode tab forming method and an electrode tab forming apparatus.
  • a battery module that is mounted in a vehicle such as an electric vehicle and has a battery stack in which a plurality of flat batteries having a power generating element housed inside an exterior body are stacked as a power source for driving a vehicle motor. ing.
  • an electrode tab including an anode-side electrode tab and a cathode-side electrode tab is led out from one side of the outer package.
  • the electrode tabs of each battery are electrically connected to each other via a bus bar having conductivity.
  • the electrode tab and the bus bar are joined by laser welding. In a state where a plurality of batteries are stacked, the electrode tab is formed to be bent in order to weld the electrode tab and the bus bar.
  • the anode side electrode tab and the cathode side electrode tab may differ in shape and material characteristics. Therefore, when the anode-side electrode tab and the cathode-side electrode tab are formed by bending using the same forming die under the same forming conditions, the anode-side electrode tab and the cathode-side electrode tab have a resistance to a pressing force and a necessary bending angle. Since they are different from each other, the bending loads of the two influence each other, and the bending position may vary. As a result, the positioning accuracy between the electrode tab and the bus bar is deteriorated, and there is a possibility that the welding quality when the electrode tab and the bus bar are laser-welded is slightly varied.
  • An object of the present invention is to provide an electrode tab forming method and an electrode tab forming apparatus capable of bending an electrode tab with high accuracy.
  • An electrode tab molding method that achieves the above object is to support a base end portion of one electrode tab of a pair of electrode tabs of a battery by a first supporting surface of a first die, and to support the other electrode tab. Is supported by the second supporting surface of the second die. Then, the first punch and the second punch are integrally moved relative to the first die and the second die along a first direction orthogonal to the first support surface and the second support surface. Then, after bending the one electrode tab by the first punch, the other electrode tab is bent by the second punch.
  • the electrode tab forming apparatus that achieves the above object is a forming apparatus that forms a bent portion by bending a pair of electrode tabs of a battery.
  • the electrode tab forming device includes a first die having a first supporting surface that supports a base end portion of one electrode tab of the pair of electrode tabs, and a second die that supports a base end portion of the other electrode tab.
  • a second die having a supporting surface, a first punch that cooperates with the first die to bend and form the one electrode tab, and a second punch that cooperates with the second die to bend and form the other electrode tab. And a second punch.
  • the apparatus for forming an electrode tab further includes the first die and the second punch integrally formed with the first punch and the second punch along a first direction orthogonal to the first support surface and the second support surface. It has a drive unit that moves it relative to the die.
  • the electrode tab forming apparatus is configured such that one of the first tab and the second punch is integrally moved by the driving unit relative to the first die and the second die during one operation. The bending timing of the electrode tab of No. 1 and that of the other electrode tab are shifted.
  • the electrode tab forming method and the electrode tab forming apparatus it is possible to shift the respective bending forming timings of the anode side electrode tab and the cathode side electrode tab. Accordingly, the first punch and the second punch can bend the electrode tab with high accuracy without being affected by the bending load of the anode-side electrode tab and the cathode-side electrode tab.
  • FIG. 3 is a perspective view showing one battery of the battery stack shown in FIG. 2. It is a side view which shows typically the structure which bends and forms the anode side electrode tab (one electrode tab) in the shaping
  • FIG. 5A It is a front view which shows the principal part of the shaping
  • 6A and 6B are views for explaining the procedure for forming the electrode tab.
  • 7A and 7B are views for explaining the procedure for forming the electrode tab.
  • FIGS. 8A and 8B are views for explaining the procedure for forming the electrode tab.
  • 9A and 9B are views for explaining the procedure for forming the electrode tab.
  • 10A and 10B are views for explaining the procedure for forming the electrode tab.
  • 11A and 11B are views for explaining the procedure for forming the electrode tab.
  • FIG. 9 is a side view schematically showing a configuration in which an anode-side electrode tab (one electrode tab) is bent and formed in the electrode tab forming apparatus according to Modification 1;
  • FIG. 9 is a front view showing a main part of a device for forming an electrode tab according to Modification 2.
  • FIG. 11 is a front view showing a main part of an electrode tab molding apparatus according to Modification 3;
  • the XYZ axes attached to the figure indicate the orientation of the battery module 100.
  • the X axis indicates a direction that intersects the stacking direction of the batteries 110 and that is along the longitudinal direction of the batteries 110.
  • the Y-axis indicates a direction that intersects the stacking direction of the batteries 110 and is along the lateral direction of the batteries 110.
  • the Z axis represents the stacking direction of the batteries 110.
  • FIG. 1 is a perspective view showing the battery module 100.
  • FIG. 2 is a perspective view showing a part of the battery module 100 shown in FIG. 1 in an exploded manner. First, the battery module 100 including the battery stack 110S will be described.
  • the battery module 100 has a battery case 110 S, which is a stack of a plurality of flat batteries 110, housed in a module case 120.
  • the module case 120 is composed of four plate members and also functions as a pressurizing unit that pressurizes the battery stack 110S.
  • the plurality of batteries 110 are electrically connected by the bus bar unit 130 while being pressurized by the module case 120.
  • an adhesive or a pressure sensitive adhesive is applied between the stacked batteries 110.
  • FIG. 3 is a side view showing a cross section of a main part of the battery module 100.
  • FIG. 4 is a perspective view showing one battery 110 of the battery stack 110S.
  • battery 110 is, for example, a flat lithium ion secondary battery.
  • the battery 110 has a main body 110H in which the power generation element 111 is sealed with a pair of laminate films 112, and a pair of electrode tabs 113.
  • the power generation element 111 is formed by stacking a positive electrode and a negative electrode via a separator.
  • the power generation element 111 is sealed with a laminate film 112 together with the electrolytic solution.
  • the laminate film 112 is configured by covering both sides of the metal foil with an insulating sheet.
  • the laminate film 112 is formed by bending both ends 112d along the longitudinal direction X upward in the stacking direction Z.
  • the electrode tab 113 is electrically connected to the power generation element 111 and is led out from the laminate film 112 to the outside.
  • the electrode tab 113 has an anode side electrode tab 113A and a cathode side electrode tab 113K. Both the anode-side electrode tab 113A and the cathode-side electrode tab 113K extend from one end of the laminate film 112 along the lateral direction Y toward one direction along the longitudinal direction X (left front side in FIG. 4).
  • the term “electrode tab 113” means both the anode-side electrode tab 113A and the cathode-side electrode tab 113K.
  • the electrode tab 113 is bent and formed in an L shape from the base end portion 113c to the tip end portion 113d.
  • a molding device 10 for the electrode tab 113 according to the present embodiment, which will be described later, is a device for bending the plate-shaped electrode tab 113 into an L-shape. By bending, the tip portion 113d of the electrode tab 113 is formed in a flat shape so as to face the bus bar 132. Note that the shape of the electrode tab 113 is not limited to the L-shape shown in the figure, and has an appropriate shape in relation to the shape of the bus bar 132.
  • the material for forming the anode-side electrode tab 113A is not particularly limited, but, for example, aluminum can be used.
  • the material for forming the cathode-side electrode tab 113K is not particularly limited, but copper can be used, for example.
  • the thickness t1 of the anode-side electrode tab 113A is not particularly limited, but is 0.4 mm, for example.
  • the thickness t2 of the cathode-side electrode tab 113K is not particularly limited, but is 0.2 mm, for example.
  • a part of the tip portion 113d of the cathode-side electrode tab 113K includes a folded-back portion 113e that is folded back and brought into close contact.
  • the folded-back portion 113e is twice as thick as the base end portion 113c.
  • the thickness of the tip portion 113d of the anode-side electrode tab 113A and the tip portion 113d of the cathode-side electrode tab 113K can be made approximately the same, and therefore the welding conditions for the bus bar 132 are set to the anode-side electrode tab 113A and the cathode side.
  • the electrode tab 113K can be set under substantially the same conditions. As a result, manufacturability can be improved.
  • the side provided with the electrode tab 113 is supported by the pair of first spacers 114, and the side not provided with the electrode tab 113 is supported by the pair of second spacers 115.
  • the batteries 110 are stacked while being supported by the spacers 114 and 115.
  • the first spacer 114 has a connecting pin 114a which is inserted into a connecting hole (not shown) of the laminate film 112, and the second spacer 115 has a connecting pin 115a which is inserted into a connecting hole (not shown). Has been done.
  • the spacers 114, 115 are connected to the laminate film 112 by thermally caulking the tips of the connecting pins 114a, 115a.
  • Each of the spacers 114 and 115 is formed of a reinforced plastic having an insulating property.
  • the first spacer 114 has mounting portions 114b at both ends in the longitudinal direction (transverse direction Y), and the second spacer 115 has mounting portions 115b at both ends in the longitudinal direction (transverse direction Y). doing.
  • the first spacers 114 contact the mounting portions 114b adjacent to each other in the stacking direction
  • the second spacers 115 contact the mounting portions 115b adjacent to each other in the stacking direction.
  • Pins 114c and 115c are formed on the upper surfaces of the mounting portions 114b and 115b.
  • a hole 114d corresponding to the position of the pin 114c is formed on the lower surface of the mounting portion 114b (see FIG. 3).
  • the first spacer 114 has a support member 114f that supports the tip portion 113d of the electrode tab 113 from the side opposite to the bus bar 132.
  • the module case 120 includes an upper pressing plate 121 and a lower pressing plate 122 that press the power generating elements 111 of the respective batteries 110 of the battery stack 110S from above and below, and an upper part of the battery stack 110S in a pressed state. It includes a pair of side plates 123 for fixing the pressure plate 121 and the lower pressure plate 122.
  • the upper pressure plate 121 has a locate hole 121b into which a fastening bolt for fixing the battery module 100 to a pack case (not shown) is inserted.
  • the lower pressure plate 122 has a locate hole 122b into which a fastening bolt is inserted.
  • the pair of side plates 123 are welded to the upper pressure plate 121 and the lower pressure plate 122.
  • the material for forming the module case 120 is not particularly limited, but can be formed of, for example, stainless steel.
  • the bus bar unit 130 includes a bus bar 132 that electrically connects the electrode tabs 113 of the batteries 110 that are vertically arranged, a bus bar holder 131 that integrally holds the plurality of bus bars 132, and a protective cover 135 that protects the bus bar 132.
  • the bus bar unit 130 further includes an anode-side terminal 133 that makes the anode-side ends of the plurality of electrically connected batteries 110 face external input/output terminals, and a cathode that makes the cathode-side ends face external input/output terminals. And a side terminal 134.
  • a laser oscillator (not shown) irradiates the bus bar 132 with the laser beam LB.
  • the bus bar 132 and the tip portion 113d of the electrode tab 113 are joined by seam welding or spot welding.
  • the position of the electrode tab 113 and the bus bar 132 should be adjusted so that no gap is created between the electrode tab 113 and the bus bar 132. You have to manage your location.
  • the position of the tip portion 113d of the electrode tab 113 may vary in the stacking direction. Therefore, it is necessary to position the battery 110 at the processing position of the electrode tab 113 with high accuracy and improve the processing accuracy of the electrode tab 113.
  • FIG. 5A is a side view schematically showing the configuration of the molding apparatus 10 for the electrode tab 113
  • FIG. 5B is a front view showing a part of the molding apparatus 10 for the electrode tab 113 shown in FIG. 5A.
  • the forming device 10 for the electrode tab 113 is a forming device for forming the bent portion 113R by bending the anode side electrode tab 113A and the cathode side electrode tab 113K of the battery 110, respectively.
  • the molding apparatus 10 for the electrode tab 113 is roughly described.
  • the configuration of each unit will be described in detail.
  • the die 20 includes a first support that supports a base end portion 113c of the anode-side electrode tab 113A (corresponding to one electrode tab) of the pair of electrode tabs 113. It has the 1st die 21 provided with the surface 24a, and the 2nd die 22 provided with the 2nd support surface 24b which supports the base end part 113c of the cathode side electrode tab 113K (equivalent to the other electrode tab).
  • the first die 21 has a corner portion 23a at the end of the first support surface 24a.
  • the angle ⁇ of the corner portion 23a is an acute angle.
  • the second die 22 has a corner 23b at the end of the second support surface 24b.
  • the angle ⁇ of the corner portion 23b is an acute angle. Accordingly, when the cathode side electrode tab 113K is bent, the cathode side electrode tab 113K can be bent at an angle larger than 90 degrees in consideration of the influence of spring back.
  • the angle ⁇ of the corner portion 23a and the angle ⁇ of the corner portion 23b are set to different angles according to conditions such as the material and thickness of the electrode tab 113.
  • the term “die 20” means both the first die 21 and the second die 22.
  • the punch 30 cooperates with the first die 21 to bend and form the anode-side electrode tab 113A, and the punch 30 cooperates with the second die 22. And a second punch 32 for bending the cathode side electrode tab 113K.
  • the term “punch 30” means both the first punch 31 and the second punch 32.
  • the length of the first punch 31 in the first direction D1 (in the present embodiment, the stacking direction Z of the battery 110 in the present embodiment) orthogonal to the first support surface 24a and the second support surface 24b.
  • the length L1 is longer than the length L2 of the second punch 32 along the first direction D1.
  • the difference ⁇ L between the length L1 of the first punch 31 and the length L2 of the second punch 32 is set to be larger than the thickness t1 of the anode electrode tab 113A.
  • the first punch 31 and the second punch 32 have substantially the same configuration except the length.
  • the first punch 31 has a pressing surface 33a that presses and bends the anode-side electrode tab 113A during bending of the anode-side electrode tab 113A, and an inclination of a first backup plate 63a described later.
  • a sliding contact surface 34a that is in sliding contact with the surface 65a.
  • the second punch 32 has a pressing surface 33b that presses and bends the cathode-side electrode tab 113K when bending the cathode-side electrode tab 113K, and an inclination of a second backup plate 63b described later.
  • a sliding contact surface 34b that is in sliding contact with the surface 65b.
  • the width W1 of the tip 30d of the punch 30 is larger than the width W2 of the base 30c. It is formed to be small. As a result, the tip portion 30d of the punch 30 has a gap G between the punch plate 41 of the upper holding portion 40 described later.
  • the upper holding unit 40 includes a punch plate 41 that limits deformation of the base end portion 30c of the punch 30, and a base of each of the first punch 31 and the second punch 32.
  • An end portion 30c (corresponding to one end portion) and a holding plate 42 that holds the punch plate 41 are included.
  • the first punch 31 and the second punch 32 are provided with an insulating member (not shown) between them and the punch plate 41. The insulating member prevents the first punch 31 and the second punch 32 from being electrically connected via the punch plate 41 or the like.
  • the punch plate 41 has a function of making surface contact with the base end portion 30c of the punch 30 and limiting the deformation of the base end portion 30c of the punch 30 in the direction intersecting the first direction D1.
  • the punch plate 41 is arranged with the gap G between the punch plate 41 and the tip portion 30d of the punch 30 as described above.
  • the punch plate 41 has a function of allowing the tip portion 30d of the punch 30 to be deformed toward the die 20 side by the amount of the gap G, and having a function of limiting the movable range of the tip portion 30d of the punch 30. There is.
  • the holding plate 42 has a backing plate 42a having a reinforcing function and wear resistance against a processing load applied to the punch 30, and a punch holder 42b connected to the drive unit 50.
  • the backing plate 42a is, for example, hardened and formed of a metal having wear resistance.
  • the punch holder 42b fixes the base end portion 30c of the punch 30 via a fastening member such as a bolt having an insulating structure (not shown).
  • the lower holding unit 45 attaches the insulating member 46 to the lower ends of the first die 21, the second die 22, the first backup plate 63a, and the second backup plate 63b. It has a lower holder 47 that holds it through.
  • the anode side electrode tab 113A contacts the first die 21 and the first backup plate 63a
  • the cathode side electrode tab 113K contacts the second die 22 and the second backup plate 63b.
  • the insulating member 46 prevents the anode side electrode tab 113A and the cathode side electrode tab 113K from being electrically connected via the die 20 or the like.
  • the lower holder 47 is connected to the drive unit 51.
  • the lower holder 47 fixes the lower ends of the first die 21, the second die 22, the first backup plate 63a, and the second backup plate 63b via fastening members such as bolts having an insulating structure (not shown).
  • the drive unit 50 integrally includes the first punch 31 and the second punch 32 along a first direction D1 orthogonal to the first support surface 24a of the first die 21 and the second support surface 24b of the second die 22. It is moved relative to the first die 21 and the second die 22.
  • the drive unit 50 moves the upper holding unit 40 in the first direction D1 (downward in FIGS. 5A, 5B, and 5C).
  • the drive unit 50 is composed of, for example, a servo press or a mechanical press.
  • the driving unit 50 moves the upper holding unit 40 in the first direction D1, so that the punch 30 held by the upper holding unit 40 moves in the first direction D1. As a result, the punch 30 moves toward and away from the die 20 relatively.
  • one electrode tab (the anode-side electrode tab 113A) is moved.
  • the other electrode tab (cathode side electrode tab 113K) are bent at different timings. Since the first punch 31 and the second punch 32 are moved as a unit, the relative positional relationship between the first punch 31 and the second punch 32 is maintained, and the accuracy when bending the electrode tab 113 is increased. You can
  • the drive unit 51 moves the lower holding unit 45 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C).
  • the drive unit 51 is composed of, for example, a servo press or a mechanical press.
  • the driving unit 51 moves the lower holding unit 45 in the direction opposite to the first direction D1, so that the die 20 held by the lower holding unit 45 moves in the first direction D1.
  • the driving unit 51 moves the first die 21 and the second die 22 as a unit. Since the first die 21 and the second die 22 are moved as a unit, the relative positional relationship between the first die 21 and the second die 22 is maintained, and the accuracy when bending the electrode tab 113 is increased. You can
  • the drive unit 50 moves the punch 30, and the drive unit 51 moves the die 20.
  • the bending of the electrode tab 113 can be performed by moving the punch 30 and the die 20 relatively closer to each other. Therefore, the electrode tab 113 can be bent by moving only the punch 30 toward the die 20 or, conversely, moving only the die 20 toward the punch 30.
  • the bending angle adjusting unit 60 includes a first bending angle adjusting unit 61 for adjusting the bending angle ⁇ a of the bending portion 113R of the anode-side electrode tab 113A, and a cathode-side electrode tab. And a second bending angle adjusting portion 62 for adjusting the bending angle ⁇ b of the bending portion 113R of 113K.
  • the first bending angle adjusting unit 61 drives in and bends the anode-side electrode tab 113A bent by the first punch 31 moved in the first direction D1.
  • the second bending angle adjusting section 62 drives in the cathode side electrode tab 113K bent by the second punch 32 moved in the first direction D1 to perform bending processing.
  • the first bending angle adjuster 61 includes a first backup plate 63a having an inclined surface 65a and a first height adjuster 64a for adjusting the height of the first backup plate 63a with respect to the first support surface 24a of the first die 21.
  • the second bending angle adjuster 62 includes a second backup plate 63b having an inclined surface 65b and a second height adjuster 64b for adjusting the height of the second backup plate 63b with respect to the second support surface 24b of the second die 22. And.
  • the first height adjusting unit 64a and the second height adjusting unit 64b have, for example, one or a plurality of adjusting spacers incorporated therein in order to save space.
  • the heights of the first backup plate 63a and the second backup plate 63b can be adjusted by combining adjustment spacers having different thicknesses.
  • the term “bending angle adjusting section 60” means both the first bending angle adjusting section 61 and the second bending angle adjusting section 62.
  • the first punch 31 is moved in the first direction D1 (downward in FIG. 5A), and the first die 21 is moved in the direction opposite to the first direction D1 (upward in FIG. 5A).
  • the first punch 31 and the first die 21 move closer to each other, and the sliding contact surface 34a of the first punch 31 makes sliding contact with the inclined surface 65a of the first backup plate 63a.
  • the sliding contact surface 34a of the first punch 31 slides along the inclined surface 65a and moves in the second direction D2 intersecting the first direction D1 (stacking direction Z).
  • the tip portion 30d of the first punch 31 is configured to be deformable toward the first die 21 side by the gap G between the first punch 31 and the punch plate 41.
  • the tip portion 30d of the first punch 31 is deformed so as to bend in the second direction (downward right direction in FIG. 5A) toward the first die 21 side.
  • the bending angle ⁇ a of the bent portion 113R of the anode-side electrode tab 113A further increases.
  • the first bending angle adjusting section 61 adjusts the bending angle ⁇ a of the anode-side electrode tab 113A.
  • the second punch 32 is moved in the first direction D1 (downward in FIG. 5B), and the second die 22 is moved in the direction opposite to the first direction D1 (upward in FIG. 5B).
  • the second punch 32 and the second die 22 move closer to each other, and the sliding contact surface 34a of the second punch 32 makes sliding contact with the inclined surface 65b of the second backup plate 63b.
  • the sliding contact surface 34b of the second punch 32 slides along the inclined surface 65b and moves in the third direction D3 intersecting the first direction D1 (stacking direction Z).
  • the tip portion 30d of the second punch 32 is configured to be deformable toward the second die 22 side by the gap G between the second punch 32 and the punch plate 41.
  • the tip portion 30d of the second punch 32 is deformed so as to bend in the third direction (downward right direction in FIG. 5B) toward the second die 22 side.
  • the bending angle ⁇ b of the bent portion 113R of the cathode-side electrode tab 113K further increases.
  • the second bending angle adjusting section 62 adjusts the bending angle ⁇ b of the cathode side electrode tab 113K.
  • the pressing portion 70 presses and holds the base end portion 113c of the electrode tab 113 against the die 20 when the tip end portion 113d of the electrode tab 113 is bent by the punch 30, and the electrode tab 113 is processed by the punch 30. It has a function of preventing the position from being displaced due to being dragged in the (first direction D1, second direction D2, and third direction D3).
  • the pressing portion 70 is supported by a fixing portion 71 fixed to the upper holding portion 40 so as to be relatively movable in the first direction D1.
  • a biasing member 72 is arranged between the fixed portion 71 and the pressing portion 70, and biases the pressing portion 70 in the first direction D1.
  • the pressing portion 70 is provided with an insulating structure (not shown) between a portion that holds the anode side electrode tab 113A and a portion that holds the cathode side electrode tab 113K.
  • the insulating structure electrically insulates between the two portions of the holding portion 70 so that the portion holding the anode side electrode tab 113A and the portion holding the cathode side electrode tab 113K are not electrically connected.
  • the fixing portion 71 and the biasing member 72 are also provided with an insulating structure (not shown) in order to electrically insulate the portion of the holding portion 70 that holds the anode-side electrode tab 113A from the portion that holds the cathode-side electrode tab 113K. ing.
  • the molding apparatus 10 for the electrode tab 113 needs to have an insulating structure for all equipment-side portions that contact the anode-side electrode tab 113A and the cathode-side electrode tab 113K.
  • Control unit 80 The control unit 80 is mainly composed of a CPU and a memory, and controls the operation of the drive units 50, 51 and the like.
  • the code shown in FIG. 5D is t1: Thickness of the anode side electrode tab 113A t2: Thickness of the cathode side electrode tab 113K x1: Dimensional difference in the height direction between the lower surface of the anode side electrode tab 113A and the lower surface of the cathode side electrode tab 113K x2: Dimensional difference in the height direction between the thickness center Oc of the anode side electrode tab 113A and the upper surface of the cathode side electrode tab 113K y1: the first supporting surface 24a of the first die 21 and the second supporting surface of the second die 22. Height difference between support surface 24b and height y2: The height difference between the pressing surface 33a of the first punch 31 and the pressing surface 33b of the second punch 32 is shown.
  • the cathode-side electrode tab 113K includes a folded-back portion 113e, and the lower surface 113f of the base end portion 113c is placed on the second support surface 24b of the second die 22.
  • the side electrode tab 113K can be set to be substantially coincident with the timing of contact with the second support surface 24b.
  • the y2, which represents the dimensional difference between the pressing surfaces 33a and 33b of the punch 30, is set to be substantially the same as x2, or the pressing surface of the second punch 32 after the bending of the anode-side electrode tab 113A is completed.
  • the size is set so that 33b contacts the upper surface of the cathode-side electrode tab 113K.
  • x2 is half the thickness (t2/2) of the cathode-side electrode tab 113K.
  • the reason why y2 is set to be approximately the same as x2 is as follows.
  • the first punch 31 pushes the anode-side electrode tab 113A by a half of the thickness of the anode-side electrode tab 113A (t1/2)
  • the anode-side electrode tab 113A is bent substantially at a right angle, and the bending is almost completed.
  • the anode side electrode tab 113A is sandwiched by the first die 21 and the first punch 31, and a force for gripping the anode side electrode tab 113A is generated.
  • the cathode electrode tab 113K Since the bending of the cathode electrode tab 113K is started after gripping the anode electrode tab 113A, the cathode electrode tab 113K can be bent with high precision without being affected by the bending load of the anode electrode tab 113A. Because.
  • FIGS. 5A to 5C and FIGS. 6 to 11 are views for explaining the forming procedure of the electrode tab 113.
  • Each drawing (A) shows the forming state of the cathode side electrode tab 113K
  • each drawing (B) shows the anode side electrode tab 113A.
  • the molding situation of is shown.
  • the tip portion 30d of the first punch 31 and the tip portion 30d of the second punch 32 are set so as to bend toward the main body 110H of the battery 110 so that the drive-in bending of the electrode tab 113 can be reliably performed. 10(A)(B)).
  • FIGS. 6 to 11 show that there is almost no gap between the punch 30 and the pressing portion 70.
  • the method of forming the electrode tab 113 using the forming apparatus 10 for the electrode tab 113 will be described in brief.
  • the electrode end 113c of one of the pair of electrode tabs 113 of the battery 110 (anode-side electrode tab 113A) will be described. It is supported by the first supporting surface 24a of the first die 21, and the base end portion 113c of the other electrode tab 113 (cathode side electrode tab 113K) is supported by the second supporting surface 24b of the second die 22.
  • the first punch 31 and the second punch 32 are integrally formed relative to the first die 21 and the second die 22 along a first direction D1 orthogonal to the first support surface 24a and the second support surface 24b.
  • the anode side electrode tab 113A is bent by the first punch 31, and then the cathode side electrode tab 113K is bent by the second punch 32. The details will be described below.
  • the battery 110 is carried into the molding device 10 for the electrode tab 113, and is held at a predetermined position by a holding device (not shown).
  • the electrode tabs 113 (the anode-side electrode tabs 113A and the cathode-side electrode tabs 113K) are arranged in the space between the punch 30 and the pressing portion 70, and the die 20 and the bending angle adjusting portion 60.
  • the control unit 80 controls the operation of the driving unit 50 to move the upper holding unit 40 downward in the first direction D1 (see FIGS. 5A, 5B, and 5C).
  • the control unit 80 controls the operation of the drive unit 51 to move (raise) the lower holding unit 45 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C).
  • the punch 30 and the pressing unit 70 move in the first direction D1.
  • the die 20 and the bending angle adjusting portion 60 move in the direction opposite to the first direction D1.
  • the first support surface 24a of the first die 21 abuts on the base end portion 113c of the anode-side electrode tab 113A, and the second support surface of the second die 22. 24b contacts the base end part 113c of the cathode side electrode tab 113K.
  • 113 A of anode side electrode tabs are arrange
  • the cathode side electrode tab 113K is arranged on the second support surface 24b so that the tip portion 113d projects outward from the second support surface 24b.
  • the pressing portion 70 contacts the base end portion 113c of the anode side electrode tab 113A and the base end portion 113c of the cathode side electrode tab 113K.
  • 113 A of anode side electrode tabs hold
  • the cathode side electrode tab 113K is held by pressing the base end portion 113c against the second support surface 24b.
  • the force of pressing the electrode tab 113 by the pressing portion 70 may be set to be different between the cathode side electrode tab 113K and the anode side electrode tab 113A. Since the electrode tab 113 having a relatively high bending rigidity has a higher resistance (bending load) to the pressing force of the punch 30 than the electrode tab 113 having a relatively low bending rigidity, the pressing force of the pressing portion 70 is set to be high. Good.
  • the flexural rigidity of the electrode tab 113 varies depending on the material and the plate thickness, so it is preferable to design it appropriately.
  • the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1.
  • the controller 80 brings the pressing surface 33a of the first punch 31 into contact with the anode-side electrode tab 113A and starts bending.
  • the step shown in FIG. 5C since the length L1 of the first punch 31 along the first direction D1 is longer than the length L2 of the second punch 32 along the first direction D1, the step shown in FIG. Then, the second punch 32 is not in contact with the cathode side electrode tab 113K.
  • the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1.
  • the controller 80 bends the anode-side electrode tab 113A with the first punch 31.
  • the controller 80 forms the bent portion 113R on the anode-side electrode tab 113A with the corner 23a of the first die 21 as the bending start point.
  • the bending angle of the bent portion 113R of the anode electrode tab 113A is ⁇ 1.
  • the bending angle ⁇ 1 is about 90 degrees.
  • the control unit 80 brings the pressing surface 33b of the second punch 32 into contact with the cathode-side electrode tab 113K and starts bending.
  • the cathode-side electrode tab 113K When the cathode-side electrode tab 113K is formed by bending, the anode-side electrode tab 113A formed by bending first is in a state of being sandwiched and gripped by the corner portion 23a of the first die 21 and the first punch 31.
  • the material forming the anode-side electrode tab 113A is, for example, aluminum
  • the material forming the cathode-side electrode tab 113K is, for example, copper.
  • the back side of the bent corner of the aluminum tab should be the corner of the first die 21.
  • corner portion 23a of the first die 21 on the aluminum tab side also has an important function from the viewpoint of gripping the aluminum tab when the copper tab is bent and formed after the aluminum tab is almost completely formed (described later). See FIGS. 9A and 9B).
  • the difference ⁇ L (see FIG. 5C) between the length L1 of the first punch 31 and the length L2 of the second punch 32 is set larger than the thickness t1 of the anode-side electrode tab 113A. Therefore, as shown in FIG. 8B, after the first punch 31 bends and forms the anode side electrode tab 113A to the bending angle ⁇ 1, the second punch 32 abuts on the cathode side electrode tab 113K and the cathode side electrode The bending of the tab 113K is started. As described above, by shifting the timing of starting the bending of the anode-side electrode tab 113A and the cathode-side electrode tab 113K, the first punch 31 and the second punch 32 are not affected by their mutual bending loads. Bending can be performed.
  • the anode-side electrode tab 113A is bent and formed before the cathode-side electrode tab 113K, but the present invention is not limited to this.
  • the cathode-side electrode tab 113K is bent and formed before the anode-side electrode tab 113A. You may. Further, the pressing force of the first punch 31 when the electrode tab 113 is bent and formed may be the same as the pressing force of the second punch 32, or may be different from each other.
  • the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1.
  • the controller 80 bends the cathode side electrode tab 113K by the second punch 32.
  • the controller 80 forms a bent portion 113R on the cathode side electrode tab 113K.
  • the bending angle of the bent portion 113R of the cathode-side electrode tab 113K is set to ⁇ 2.
  • the bending angle ⁇ 2 is about 90 degrees.
  • the anode-side electrode tab 113A is maintained in a gripped state by the corner 23a of the first die 21 and the first punch 31.
  • the bent portion 113R of the cathode side electrode tab 113K is formed so as to be bent with the tip side of the cathode side electrode tab 113K as a starting point of bending rather than the corner portion 23b of the second die 22.
  • the folded-back portion 113e is twice as thick as the other portion of the tip portion 113d. Therefore, the bending rigidity of the folded-back portion 113e becomes higher than that of the other portion of the tip portion 113d, and the bending rigidity sharply changes at the boundary between the folded-back portion 113e and the other portion of the tip portion 113d. Therefore, the cathode-side electrode tab 113K is deformed so as to be bent starting from the vicinity of the boundary between the folded-back portion 113e and the other portion of the tip portion 113d.
  • the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1.
  • the first punch 31 and the second punch 32 reach the bottom dead center, as shown in FIGS. 10(A) and 10(B).
  • the first bending angle adjusting unit 61 the height of the first backup plate 63a with respect to the first supporting surface 24a of the first die 21 is adjusted in advance by the first height adjusting unit 64a.
  • the second bending angle adjusting section 62 the height of the second backup plate 63b with respect to the second supporting surface 24b of the second die 22 is adjusted in advance by the second height adjusting section 64b.
  • the sliding contact surface 34a of the first punch 31 is in sliding contact with the inclined surface 65a of the first backup plate 63a, slides along the inclined surface 65a, and moves in the second direction D2.
  • the tip portion 30d of the first punch 31 is bent in the second direction (lower right direction in FIG. 5A) toward the first die 21 side within the range of movement (gap G) limited by the punch plate 41. Deform.
  • the tip portion 30d of the first punch 31 the bending angle of the bent portion 113R of the anode electrode tab 113A is pushed in the bending direction so as to be further increased, and the angle ⁇ 1 changes to the angle ⁇ 3 (> ⁇ 1).
  • the angle ⁇ 3 is set to be larger than the final bending angle of the anode-side electrode tab 113A in consideration of spring back.
  • the sliding contact surface 34b of the second punch 32 is in sliding contact with the inclined surface 65b of the second backup plate 63b, slides along the inclined surface 65b, and moves in the third direction D3.
  • the tip portion 30d of the second punch 32 is bent in the third direction (downward right direction in FIG. 5B) toward the second die 22 within the range of movement (gap G) limited by the punch plate 41. Deform.
  • the tip portion 30d of the second punch 32 the bending portion 113R of the cathode side electrode tab 113K is pushed in the bending direction so as to be further increased, and the angle ⁇ 2 is changed to the angle ⁇ 4 (> ⁇ 2).
  • the angle ⁇ 4 is set to be larger than the final bending angle of the cathode-side electrode tab 113K in consideration of springback.
  • control unit 80 controls the operation of the drive unit 50 to move (raise) the punch 30 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C). As a result, the control unit 80 retracts the punch 30 from the processing position of the electrode tab 113.
  • the anode-side electrode tab 113A springs back from the bending angle ⁇ 3 to the bending angle ( ⁇ 1 in this embodiment) that is finally desired.
  • the cathode-side electrode tab 113K springs back from the bending angle ⁇ 4 to the bending angle ( ⁇ 2 in this embodiment) that is finally desired.
  • control unit 80 controls the operation of the drive unit 50 to further move the punch 30 and the pressing unit 70 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C) ( Raise). Further, the control unit 80 controls the operation of the driving unit 51 to move the die 20 and the bending angle adjusting unit 60 in a direction in which they are separated from the punch 30 (downward in FIGS. 5A, 5B, and 5C). (Lower) This completes the bending of the electrode tab 113.
  • the processing conditions for bending will vary depending on the shape and material characteristics of the electrode tab 113 to be processed. Therefore, when the anode-side electrode tab 113A and the cathode-side electrode tab 113K have different shapes such as material characteristics and plate thickness, and when the anode-side electrode tab 113A and the cathode-side electrode tab 113K are simultaneously formed using the same punch, they are Bending load may affect the bending position.
  • the cathode side electrode tab 113K has the folded portion 113e during bending, a gap is created between the corner (R part) of the die and the forming surface of the cathode side electrode tab 113K, and bending is performed in consideration of springback. There is a problem that it is difficult to obtain molding precision. In order to adjust to the required bending angle, it is necessary to remake the punch or die in order to change the shape.
  • anode side electrode tab 113A and the cathode side electrode tab 113K also have different required bending angles in consideration of springback, if one bending angle condition is met, springback will occur in the other and the desired angle will be obtained. Bending may not be possible.
  • the anode side electrode tab 113A and the cathode side electrode tab 113K are formed by using different first punches 31 and second punches 32 with different bending forming timings. Therefore, when the anode-side electrode tab 113A and the cathode-side electrode tab 113K are bent, the influences of the bending loads on each other are unlikely to occur, and the conditions for the bending angles of the anode-side electrode tabs are individually optimized so that the anode-side electrodes The tab 113A and the cathode side electrode tab 113K can be bent into a desired shape.
  • the dimensional changes of the bending of each of the anode-side electrode tab 113A and the cathode-side electrode tab 113K can be performed with high precision without recreating the shapes of the die 20 and the punch 30 as they are. Also, when the molding size changes due to aged friction due to continuous use, the molding size can be adjusted without remanufacturing the die 20 and the punch 30.
  • the tip surface of the electrode tab 113 is It is important that they are all parallel and are in the same plane.
  • FIG. 4 even in the battery 110 alone, in a state where the tip 113d of the aluminum tab (anode side electrode tab 113A) and the tip 113d of the copper tab (cathode side electrode tab 113K) are bent at 90 degrees, It is important that the front end surface of the aluminum tab and the front end surface of the copper tab are arranged in parallel and in the same plane.
  • a tip corner portion (corner portion on the pressing portion 70 side) of the first punch 31 that contacts the aluminum tab and a tip corner portion (corner portion of the holding portion 70 side) that contacts the copper tab of the second punch 32 are formed.
  • the punch 30 is arranged so as to be parallel to each other and both corners to move in the same plane along the Z direction.
  • the bending angle is hardly maintained at 90 degrees due to the influence of spring back, and the angle on the back side of the electrode tab 113 is opened slightly larger than 90 degrees ( It is formed so that the bending angle on the surface side is obtuse.
  • the first spacer 114 can be easily attached. By sandwiching the electrode tab 113 between the one spacer 114 and the bus bar 132, the bent portion of the electrode tab 113 is held at 90 degrees.
  • the bending rigidity of the copper tab is higher than the bending rigidity of the aluminum tab (anode side electrode tab 113A), and the reaction force during molding is also high.
  • an aluminum tab having a low bending rigidity is formed first, and the aluminum tab having a high bending rigidity is sandwiched between the first punch 31 and the corner portion 23a of the first die 21 and gripped.
  • the parallelism in the 90-degree bending posture can be ensured between the tip surface of the bent portion of the copper tab and the tip surface of the bent portion of the aluminum tab, and positional deviation of the tip surface in the vertical direction can be suppressed.
  • the aluminum tab has a thickness of 0.4 mm and the copper tab has a thickness of 0.2 mm, the characteristics of the material itself and the copper tab may be coated. The thinner the copper tab, the higher the bending rigidity.
  • the electrode tab 113 having high bending rigidity is attached to the electrode tab 113 formed in advance while being gripped.
  • the first punch 31 and the second punch 32 are integrally moved with respect to the first die 21 and the second die 22.
  • the bending can be carried out at different timings, and one electrode tab (anode side electrode tab 113A) can be bent and then the other.
  • the electrode tab (cathode side electrode tab 113K) is formed by bending. Since the battery 110 is not moved, the deterioration of the parallelism between the tip surfaces of the electrode tabs 113 due to the positional displacement of the battery 110 does not fundamentally occur.
  • first punch 31 and the second punch 32 move together, and the first die 21 and the second die 22 also move together. These configurations are also important for increasing the accuracy when bending the electrode tab 113.
  • the base end portion 113c of the anode-side electrode tab 113A (one electrode tab) of the pair of electrode tabs 113 of the battery 110 is attached to the first die 21.
  • the cathode side electrode tab 113K (the other electrode tab) is supported by the second support surface 24b of the second die 22.
  • the first punch 31 and the second punch 32 are integrally formed relative to the first die 21 and the second die 22 along a first direction D1 orthogonal to the first support surface 24a and the second support surface 24b.
  • the electrode tab 113A is bent by the first punch 31, and then the other electrode tab 113K is bent by the second punch 32.
  • the first punch 31 and the second punch 32 can bend the electrode tab 113 with high precision without being affected by the mutual bending load of the anode side electrode tab 113A and the cathode side electrode tab 113K. Furthermore, in one process (one shot) in which the punch 30 and the die 20 are brought close to each other and bent, the bending can be performed at a different timing, and the battery 110 is not moved. Basically, the deterioration of the parallelism between the tip surfaces of the tabs 113 does not occur.
  • the bending angle of the anode-side electrode tab 113A is adjusted by deforming the first punch 31 in the second direction D2 that intersects the first direction D1.
  • the bending angle of the bent portion 113R of the anode-side electrode tab 113A can be adjusted with high accuracy, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved.
  • the bending angle of the cathode side electrode tab 113K is adjusted by deforming the second punch 32 in the third direction D3 intersecting the first direction D1.
  • the bending angle of the bent portion 113R of the cathode-side electrode tab 113K can be adjusted with high accuracy, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved.
  • cathode side electrode tab 113K is bent while the previously bent anode side electrode tab 113A is gripped by the corner 23a of the first die 21 and the first punch 31.
  • the second punch 32 can bend the cathode-side electrode tab 113K with high accuracy without being affected by the bending load of the anode-side electrode tab 113A.
  • the bending rigidity of one electrode tab 113A is lower than the bending rigidity of the other electrode tab 113K.
  • the cathode side electrode tab 113K having high bending rigidity is formed by forming the cathode side electrode tab 113K having high bending rigidity while gripping the anode side electrode tab 113A formed by bending in advance. Can be bent with high precision.
  • the forming device 10 for the electrode tab 113 of the present embodiment is a forming device for forming a bent portion by bending the pair of electrode tabs 113 of the battery 110.
  • This molding apparatus includes a first die 21 having a first support surface 24a that supports a base end portion 113c of an anode-side electrode tab 113A (one electrode tab) of a pair of electrode tabs 113, and a cathode-side electrode tab 113K.
  • a second die 22 having a second support surface 24b that supports the base end portion 113c of the other electrode tab, and a first punch 31 that cooperates with the first die 21 to bend and form one electrode tab 113A.
  • a second punch 32 that cooperates with the second die 22 to bend and form the other electrode tab 113K, and a first punch along a first direction D1 orthogonal to the first support surface 24a and the second support surface 24b.
  • the punches 31 and the second punches 32 are integrally provided with driving units 50 and 51 that relatively move the punches 31 and the second punches 32 with respect to the first die 21 and the second die 22. Then, during one operation in which the drive parts 50 and 51 move the first punch 31 and the second punch 32 as a unit relative to the first die 21 and the second die 22, the anode-side electrode tab 113A and The bending timing of the cathode side electrode tab 113K is shifted.
  • the bending timings of the anode-side electrode tab 113A and the cathode-side electrode tab 113K are shifted, so that the first punch 31 and the second punch 32 are separated from the anode-side electrode tab 113A and the anode-side electrode tab 113A.
  • the electrode tab 113 can be bent and formed with high precision without being affected by the mutual bending load of the cathode side electrode tab 113K. Furthermore, in one process (one shot) in which the punch 30 and the die 20 are brought close to each other and bent, the bending can be performed at a different timing, and the battery 110 is not moved. Basically, the deterioration of the parallelism between the tip surfaces of the tabs 113 does not occur.
  • the timing is shifted by making the distance between the pressing surface 33a of the first punch 31 and the anode-side electrode tab 113A different from the distance between the pressing surface 33b of the second punch 32 and the cathode-side electrode tab 113K. It becomes.
  • the bending timing of each of the anode electrode tab 113A and the cathode electrode tab 113K can be shifted to a desired timing.
  • a first bending angle adjusting section 61 for adjusting the bending angle of the anode electrode tab 113A is further provided.
  • the bending angle of the bent portion 113R of the anode-side electrode tab 113A can be adjusted with high accuracy by the first bending angle adjusting portion 61, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved. Can be improved.
  • the pressing force of the first punch 31 is constant and only the bending angle of the bent portion 113R of the anode-side electrode tab 113A can be adjusted by the first bending angle adjusting portion 61, a parameter for adjusting the bending angle. Can be narrowed down to one. As a result, it is possible to suppress variations in the molding of the anode-side electrode tab 113A and stably carry out highly accurate molding.
  • the bending angle can be adjusted by the first bending angle adjusting unit 61 without replacing the first die 21.
  • a second bending angle adjusting section 62 for adjusting the bending angle of the cathode side electrode tab 113K.
  • the bending angle of the bent portion 113R of the cathode-side electrode tab 113K can be adjusted with high accuracy by the second bending angle adjusting portion 62, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved. Can be improved. Further, since the pressing force of the second punch 32 is constant and only the bending angle of the bent portion 113R of the cathode side electrode tab 113K can be adjusted by the second bending angle adjusting portion 62, a parameter for adjusting the bending angle is set. Can be narrowed down to one. As a result, it is possible to suppress variations in the molding of the cathode-side electrode tab 113K and stably carry out highly accurate molding. In addition, the second bending angle adjusting unit 62 can adjust the bending angle without replacing the second die 22.
  • the difference ⁇ L between the length L1 of the first punch 31 along the first direction D1 and the length L2 of the second punch 32 along the first direction D1 is determined by the anode-side electrode tab 113A (one electrode). It is larger than the thickness t1 of the tab). Therefore, after the first punch 31 bends and forms the anode-side electrode tab 113A at the bending angle ⁇ 1, the second punch 32 contacts the cathode-side electrode tab 113K and bends and forms the cathode-side electrode tab 113K. It can be started. Therefore, the timing of starting the bending of the anode-side electrode tab 113A and the cathode-side electrode tab 113K can be reliably shifted.
  • the angle ⁇ of the corner portion 23a of the first die 21 and the angle ⁇ of the corner portion 23b of the second die 22 are acute angles.
  • the bending angle can be made larger than 90 degrees during bending.
  • the electrode tab 113 when it is desired to be bent at 90 degrees, it can be bent at a bending angle larger than 90 degrees in consideration of the influence of spring back.
  • FIG. 12 is a side view schematically showing a configuration in which the anode-side electrode tab 113A (one electrode tab) is bent and formed in the forming apparatus 10 for the electrode tab 113 according to the first modification.
  • the forming apparatus 10 for the electrode tab 113 according to the first modification differs from the forming apparatus 10 of the above-described embodiment in that the configuration of the height adjusting unit 66 of the bending angle adjusting unit 60 is modified.
  • the first bending angle adjusting unit 61 in the molding apparatus 10 of Modification 1 adjusts the height of the first backup plate 63a having the inclined surface 65a and the first backup plate 63a with respect to the first supporting surface 24a of the first die 21.
  • a height adjusting unit 66 for adjusting the height In the embodiment, the first height adjusting portion 64a and the second height adjusting portion 64b have adjustment spacers incorporated therein.
  • the height adjusting unit 66 of the first modification moves the first backup plate 63a in the first direction D1 approaching and separating from the first punch 31 or in the direction opposite to the first direction D1 (vertical direction in FIG. 12).
  • a drive mechanism for adjusting the height of the first backup plate 63a is provided.
  • the structure of the drive mechanism is not particularly limited, but for example, a screw mechanism (not shown) can be used.
  • the screw mechanism includes, for example, a female screw formed on the first backup plate 63a and a male screw screwed to the female screw, and the height of the first backup plate 63a is increased by rotating the male screw in a tightening direction or a loosening direction. Adjustable.
  • the height adjusting unit 66 is connected to the control unit 80.
  • the control unit 80 controls the operation of the height adjusting unit 66 of the bending angle adjusting unit 60.
  • the second bending angle adjusting section 62 also has a height adjusting section 66 for adjusting the height of the second backup plate 63
  • the control portion 80 causes the height adjusting portion 66 of the bending angle adjusting portion 60 to operate. 12 is controlled to move (raise) the first backup plate 63a in a direction approaching the first punch 31 (upward direction in FIG. 12) to move to the first position P1. The height is adjusted to the second position P2. As a result, the sliding contact surface 34a of the first punch 31 makes sliding contact with the inclined surface 65a of the first backup plate 63a, slides along the inclined surface 65a, and moves in the second direction D2.
  • the tip portion 30d of the first punch 31 is bent in the second direction (downward right direction in FIG. 12) toward the first die 21 side within the range of movement (gap G) limited by the punch plate 41. Deform.
  • the tip portion 30d of the first punch 31 adjusts the bending angle ⁇ a of the bent portion 113R of the anode-side electrode tab 113A.
  • the height adjusting portion 66 causes the second backup plate 63b to move. , From the first position P1 to a predetermined position in the direction opposite to the first direction D1. The tip portion 30d of the second punch 32 is deformed as the second backup plate 63b moves upward, and the bending angle ⁇ b of the cathode side electrode tab 113K is adjusted.
  • the height adjusting unit 66 whose operation is controlled by the control unit 80 is provided as described above, since the bending angle of the bent portion 113R of the electrode tab 113 can be adjusted with high accuracy, it is welded to the bus bar 132 in a later step. In this case, welding accuracy can be improved. Further, since the pressing force of the punch 30 is constant and only the bending angle of the bent portion 113R of the electrode tab 113 can be adjusted by the bending angle adjusting unit 60, the parameter for adjusting the bending angle should be reduced to one. You can As a result, it is possible to suppress variation in the molding of the electrode tab 113 and stably carry out highly accurate molding. In addition, the bending angle adjusting unit 60 can adjust the bending angle without replacing the die 20.
  • FIG. 13 is a front view showing a main part of a device for forming an electrode tab according to Modification 2.
  • the distance between the pressing surface 33a of the first punch 31 and the anode side electrode tab 113A and the distance between the pressing surface 33b of the second punch 32 and the cathode side electrode tab 113K are made different.
  • the bending timing of the anode side electrode tab 113A and the cathode side electrode tab 113K is shifted. Since the position of the anode side electrode tab 113A in the battery thickness direction and the position of the cathode side electrode tab 113K in the battery thickness direction are substantially the same, the length L1 of the first punch 31 along the first direction D1 is:
  • the length L2 of the second punch 32 along the first direction D1 is different.
  • the present invention is not limited to this case, and if the bending timing of the anode side electrode tab 113A and the cathode side electrode tab 113K can be shifted, the first punch 31 and the second punch 32 have the same length. You can have it.
  • the position of the anode side electrode tab 113A in the battery thickness direction and the position of the cathode side electrode tab 113K in the battery thickness direction are relatively displaced.
  • the anode side electrode tab 113A is higher than the cathode side electrode tab 113K. Since the timing at which the anode-side electrode tab 113A contacts the first support surface 24a and the timing at which the cathode-side electrode tab 113K contact the second support surface 24b are substantially matched, the position in the height direction is the first support surface. 24a is higher than the second support surface 24b.
  • FIG. 14 is a front view showing a main part of an electrode tab forming apparatus according to Modification 3.
  • the positions of the electrode tabs 113 in the battery thickness direction are different.
  • the first punch 31 and the second punch 31 may be different.
  • the lengths of 32 can be the same.
  • the distance L5 between the pressing surface 33a of the first punch 31 and the first supporting surface 24a of the first die 21, the pressing surface 33b of the second punch 32, and the second surface of the second die 22 are set.
  • the position in the height direction is higher on the first support surface 24a than on the second support surface 24b (L6>L5).
  • the timing at which the anode side electrode tab 113A contacts the first support surface 24a and the bending is started is the timing when the cathode side electrode tab 113K contacts the second support surface 24b. Will be earlier than the timing when is started. Therefore, even when the first punch 31 and the second punch 32 have the same length, it is possible to shift the bending timing of the anode-side electrode tab 113A and the cathode-side electrode tab 113K.
  • the present invention is not limited to the above-described embodiment and modification examples 1 to 3, and can be modified as appropriate.
  • one of the electrode tabs 113 having a low bending rigidity is A mode in which the first electrode tab 113 that has been molded first and then the other electrode tab 113 that has high bending rigidity is molded while the one electrode tab 113 that has been previously molded is gripped is shown, but the invention is not limited to this case.
  • the difference between the bending rigidity of the one electrode tab 113 and the bending rigidity of the other electrode tab 113 is relatively small, the one electrode tab 113 having the higher bending rigidity is reversed first, contrary to the above case.
  • the electrode tab 113 may be molded and then the other electrode tab 113 having a low bending rigidity may be molded while gripping the one electrode tab 113 that is previously molded.
  • the reaction force when the electrode tabs 113 having high bending rigidity are bent is smaller than the reaction force when the electrodes tab 113 is bent at the same time. Bending can be performed while suppressing the orientation of the battery 110 during molding.
  • an example in which the anode side electrode tab and the cathode side electrode tab have different shapes and materials, but either one of the shapes or materials may be the same, or both shapes and materials may be the same. May be Even in this case, by applying the forming apparatus and the forming method of the electrode tab of the present embodiment, the electrode tab can be bent with high accuracy without being affected by the bending load of the anode side electrode tab and the cathode side electrode tab. Can be molded.
  • the bending angle adjusting unit adjusts the bending angle of the electrode tab by sliding the inclined surface of the backup plate to the sliding contact surface of the punch to deform the punch so as to bend.
  • a pressing member or an urging member that directly applies a pressing force or an urging force may be provided on the tip portion of the punch.
  • the first direction in which the holding unit is moved has been described as the downward direction of the molding device, but it may be appropriately changed depending on the configuration of the molding device.
  • the second direction and the third direction may be changed as appropriate.
  • the holding portion has been shown as being held by pressing the base end portion of the electrode tab against the supporting surface of the die, but the holding portion is not limited to this as long as it has a holding function.
  • the electrode tab may be sucked and held by suction from a suction port provided on the supporting surface of the die, or the electrode tab may be held to the die by utilizing magnetic force or static electricity.
  • each of the anode-side electrode tab and the cathode-side electrode tab is not limited to the above-described embodiment, and may be modified as appropriate.
  • Electrode tab forming device 20 dies, 21 First die, 22 Second die, 23a corner, 23b corner, 24a first support surface, 24b second support surface, 30 punches, 31 First punch, 32 Second punch, 33a Pressing surface, 33b Pressing surface, 34a sliding contact surface, 34b sliding contact surface, 40 upper holding part, 41 punch plate, 42 holding plate, 42a backing plate, 42b punch holder, 45 Lower holding part, 46 insulating member, 47 Lower holder, 50 drive, 51 Drive, 60 Bending angle adjustment part, 61 first bending angle adjusting section, 62 second bending angle adjusting section, 63a First backup plate, 63b Second backup plate, 64a 1st height adjustment part, 64b 2nd height adjustment part, 65a inclined surface, 65b inclined surface, 66 Height adjustment unit, 70 Pressing part, 80 control unit, 100 battery module, 110 batteries, 110H main body, 110S battery stack, 111 power generation element, 112 laminated film, 113 electrode tab, 113A Anode side electrode tab (one electrode tab), 113

Abstract

[Problem] To provide an electrode tab forming method by which an electrode tab can be bent highly accurately, and an electrode tab forming device. [Solution] An electrode tab 113 forming device 10 comprises: a first die 21 that has a first support surface 24a for supporting a proximal portion 113c of an anode-side electrode tab 113A; a second die 22 that has a second support surface 24b for supporting a proximal portion of a cathode-side electrode tab 113K; a first punch 31 for bending the anode-side electrode tab in cooperation with the first die; a second punch 32 for bending the cathode-side electrode tab in cooperation with the second die; and a drive portion 50 for causing the first punch and the second punch to be moved together relative to the first die and the second die, along a first direction D1 orthogonal to the first support surface and the second support surface. During a single operation in which the first punch and the second punch are caused to be moved together relative to the first die and the second die by the drive portion, the timing of bending of the respective electrode tabs is staggered.

Description

電極タブの成形方法および電極タブの成形装置Electrode tab molding method and electrode tab molding apparatus
　本発明は、電極タブの成形方法および電極タブの成形装置に関する。 The present invention relates to an electrode tab forming method and an electrode tab forming apparatus.
　従来から、電気自動車のような車両に搭載され、車両用モータを駆動させる電源として、発電要素が外装体の内部に収容された扁平な電池を複数枚積層した電池スタックを有する電池モジュールが知られている。 Conventionally, there is known a battery module that is mounted in a vehicle such as an electric vehicle and has a battery stack in which a plurality of flat batteries having a power generating element housed inside an exterior body are stacked as a power source for driving a vehicle motor. ing.
　例えば、下記特許文献１に開示された電池は、外装体の一側からアノード側電極タブおよびカソード側電極タブからなる電極タブが導出される。それぞれの電池の電極タブは、導電性を備えるバスバーを介して電気的に接続される。電極タブとバスバーとはレーザー溶接によって接合されている。複数の電池を積層した状態において、電極タブとバスバーとを溶接するために、電極タブは折り曲げるように成形される。 For example, in the battery disclosed in Patent Document 1 below, an electrode tab including an anode-side electrode tab and a cathode-side electrode tab is led out from one side of the outer package. The electrode tabs of each battery are electrically connected to each other via a bus bar having conductivity. The electrode tab and the bus bar are joined by laser welding. In a state where a plurality of batteries are stacked, the electrode tab is formed to be bent in order to weld the electrode tab and the bus bar.
国際公開第２０１７／０６８７０３号International Publication No. 2017/068703
　ところで、アノード側電極タブおよびカソード側電極タブは形状や材料特性が異なる場合がある。したがって、同じ成形型を用いて同じ成形条件でアノード側電極タブおよびカソード側電極タブを曲げ成形した場合、アノード側電極タブとカソード側電極タブとは、プレス力に対する抵抗力や必要な曲げ角度が異なるため、互いの曲げ負荷が影響し、曲げ位置がばらつくおそれがある。この結果、電極タブとバスバーとの位置決め精度が低下し、電極タブとバスバーとをレーザー溶接した場合の溶接品質に多少のばらつきが生じるおそれがある。 By the way, the anode side electrode tab and the cathode side electrode tab may differ in shape and material characteristics. Therefore, when the anode-side electrode tab and the cathode-side electrode tab are formed by bending using the same forming die under the same forming conditions, the anode-side electrode tab and the cathode-side electrode tab have a resistance to a pressing force and a necessary bending angle. Since they are different from each other, the bending loads of the two influence each other, and the bending position may vary. As a result, the positioning accuracy between the electrode tab and the bus bar is deteriorated, and there is a possibility that the welding quality when the electrode tab and the bus bar are laser-welded is slightly varied.
　本発明は、電極タブを高精度に曲げ成形できる電極タブの成形方法および電極タブの成形装置を提供することを目的とする。 An object of the present invention is to provide an electrode tab forming method and an electrode tab forming apparatus capable of bending an electrode tab with high accuracy.
　上記目的を達成する本発明に係る電極タブの成形方法は、電池の一対の電極タブのうちの一方の電極タブの基端部を第１ダイの第１支持面によって支持し、他方の電極タブの基端部を第２ダイの第２支持面によって支持する。そして、前記第１支持面および前記第２支持面に対して直交する第１方向に沿って第１パンチおよび第２パンチを一体として前記第１ダイおよび前記第２ダイに対して相対的に移動させて、前記第１パンチによって前記一方の電極タブを曲げ成形した後に、前記第２パンチによって前記他方の電極タブを曲げ成形する。 An electrode tab molding method according to the present invention that achieves the above object is to support a base end portion of one electrode tab of a pair of electrode tabs of a battery by a first supporting surface of a first die, and to support the other electrode tab. Is supported by the second supporting surface of the second die. Then, the first punch and the second punch are integrally moved relative to the first die and the second die along a first direction orthogonal to the first support surface and the second support surface. Then, after bending the one electrode tab by the first punch, the other electrode tab is bent by the second punch.
　また、上記目的を達成する本発明に係る電極タブの成形装置は、電池の一対の電極タブを曲げ成形して折れ曲がり部を形成する成形装置である。電極タブの成形装置は、前記一対の電極タブのうちの一方の電極タブの基端部を支持する第１支持面を備える第１ダイと、他方の電極タブの基端部を支持する第２支持面を備える第２ダイと、前記第１ダイと協働して前記一方の電極タブを曲げ成形する第１パンチと、前記第２ダイと協働して前記他方の電極タブを曲げ成形する第２パンチと、を有する。電極タブの成形装置はさらに、前記第１支持面および前記第２支持面に対して直交する第１方向に沿って前記第１パンチおよび前記第２パンチを一体として前記第１ダイおよび前記第２ダイに対して相対的に移動させる駆動部を有する。この電極タブの成形装置は、前記駆動部によって前記第１パンチおよび前記第２パンチを一体として前記第１ダイおよび前記第２ダイに対して相対的に移動させる１つの動作の間に、前記一方の電極タブおよび前記他方の電極タブの曲げ成形のタイミングをずらしている。 The electrode tab forming apparatus according to the present invention that achieves the above object is a forming apparatus that forms a bent portion by bending a pair of electrode tabs of a battery. The electrode tab forming device includes a first die having a first supporting surface that supports a base end portion of one electrode tab of the pair of electrode tabs, and a second die that supports a base end portion of the other electrode tab. A second die having a supporting surface, a first punch that cooperates with the first die to bend and form the one electrode tab, and a second punch that cooperates with the second die to bend and form the other electrode tab. And a second punch. The apparatus for forming an electrode tab further includes the first die and the second punch integrally formed with the first punch and the second punch along a first direction orthogonal to the first support surface and the second support surface. It has a drive unit that moves it relative to the die. The electrode tab forming apparatus is configured such that one of the first tab and the second punch is integrally moved by the driving unit relative to the first die and the second die during one operation. The bending timing of the electrode tab of No. 1 and that of the other electrode tab are shifted.
　本発明に係る電極タブの成形方法および電極タブの成形装置によれば、アノード側電極タブおよびカソード側電極タブのそれぞれの曲げ成形のタイミングをずらすことができる。これにより、第１パンチおよび第２パンチはアノード側電極タブおよびカソード側電極タブの互いの曲げ負荷に影響を受けることなく電極タブを高精度に曲げ成形できる。 According to the electrode tab forming method and the electrode tab forming apparatus according to the present invention, it is possible to shift the respective bending forming timings of the anode side electrode tab and the cathode side electrode tab. Accordingly, the first punch and the second punch can bend the electrode tab with high accuracy without being affected by the bending load of the anode-side electrode tab and the cathode-side electrode tab.
電池モジュールを示す斜視図である。It is a perspective view which shows a battery module. 図１に示す電池モジュールの一部を分解して示す斜視図である。It is a perspective view which decomposes|disassembles and shows some battery modules shown in FIG. 図１に示す電池モジュールの要部を断面で示す側面図である。It is a side view which shows the principal part of the battery module shown in FIG. 1 in a cross section. 図２に示す電池スタックの一の電池を示す斜視図である。FIG. 3 is a perspective view showing one battery of the battery stack shown in FIG. 2. 電極タブの成形装置においてアノード側電極タブ（一方の電極タブ）を曲げ成形する構成を模式的に示す側面図である。It is a side view which shows typically the structure which bends and forms the anode side electrode tab (one electrode tab) in the shaping|molding apparatus of an electrode tab. 電極タブの成形装置においてカソード側電極タブ（他方の電極タブ）を曲げ成形する構成を模式的に示す側面図である。It is a side view which shows typically the structure which bends and forms the cathode side electrode tab (other electrode tab) in the shaping|molding apparatus of an electrode tab. 図５Ａに示す電極タブの成形装置の要部を示す正面図である。It is a front view which shows the principal part of the shaping|molding apparatus of the electrode tab shown in FIG. 5A. 電極タブの成形装置における高さ方向の寸法の一例を示す説明図である。It is explanatory drawing which shows an example of the dimension of the height direction in the shaping|molding apparatus of an electrode tab. 図６（Ａ）（Ｂ）は、電極タブの成形手順を説明するための図である。6A and 6B are views for explaining the procedure for forming the electrode tab. 図７（Ａ）（Ｂ）は、電極タブの成形手順を説明するための図である。7A and 7B are views for explaining the procedure for forming the electrode tab. 図８（Ａ）（Ｂ）は、電極タブの成形手順を説明するための図である。FIGS. 8A and 8B are views for explaining the procedure for forming the electrode tab. 図９（Ａ）（Ｂ）は、電極タブの成形手順を説明するための図である。9A and 9B are views for explaining the procedure for forming the electrode tab. 図１０（Ａ）（Ｂ）は、電極タブの成形手順を説明するための図である。10A and 10B are views for explaining the procedure for forming the electrode tab. 図１１（Ａ）（Ｂ）は、電極タブの成形手順を説明するための図である。11A and 11B are views for explaining the procedure for forming the electrode tab. 変形例１に係る電極タブの成形装置においてアノード側電極タブ（一方の電極タブ）を曲げ成形する構成を模式的に示す側面図である。FIG. 9 is a side view schematically showing a configuration in which an anode-side electrode tab (one electrode tab) is bent and formed in the electrode tab forming apparatus according to Modification 1; 変形例２に係る電極タブの成形装置の要部を示す正面図である。FIG. 9 is a front view showing a main part of a device for forming an electrode tab according to Modification 2. 変形例３に係る電極タブの成形装置の要部を示す正面図である。FIG. 11 is a front view showing a main part of an electrode tab molding apparatus according to Modification 3;
　以下、添付した図面を参照しながら、本発明の実施形態を説明する。図面において、同一の部材には同一の符号を付し、重複する説明を省略する。図面において、各部材の大きさや比率は、実施形態の理解を容易にするために誇張し、実際の大きさや比率とは異なる場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the drawings, the same members are designated by the same reference numerals, and overlapping description will be omitted. In the drawings, the size and ratio of each member may be exaggerated for easy understanding of the embodiment and may differ from the actual size and ratio.
　図に付したＸ－Ｙ－Ｚ軸は、電池モジュール１００の方位を示している。Ｘ軸は、電池１１０の積層方向と交差し、かつ、電池１１０の長手方向に沿った方向を示している。Ｙ軸は、電池１１０の積層方向と交差し、かつ、電池１１０の短手方向に沿った方向を示している。Ｚ軸は、電池１１０の積層方向を示している。 XYZ axes attached to the figure indicate the orientation of the battery module 100. The X axis indicates a direction that intersects the stacking direction of the batteries 110 and that is along the longitudinal direction of the batteries 110. The Y-axis indicates a direction that intersects the stacking direction of the batteries 110 and is along the lateral direction of the batteries 110. The Z axis represents the stacking direction of the batteries 110.
　（電池モジュール１００）
　図１は、電池モジュール１００を示す斜視図である。図２は、図１に示す電池モジュール１００の一部を分解して示す斜視図である。まず、電池スタック１１０Ｓを含む電池モジュール１００について説明する。 (Battery module 100)
FIG. 1 is a perspective view showing the battery module 100. FIG. 2 is a perspective view showing a part of the battery module 100 shown in FIG. 1 in an exploded manner. First, the battery module 100 including the battery stack 110S will be described.
　図１および図２を参照して、電池モジュール１００は、扁平な複数の電池１１０を積層してなる電池スタック１１０Ｓがモジュールケース１２０内に収納されている。モジュールケース１２０は、４枚の板部材から構成され、電池スタック１１０Ｓを加圧する加圧ユニットとしても機能する。複数の電池１１０は、モジュールケース１２０によって加圧された状態において、バスバーユニット１３０によって電気的に接続される。図示省略するが、積層される電池１１０同士の間には、接着剤あるいは粘着剤が塗布されている。 Referring to FIGS. 1 and 2, the battery module 100 has a battery case 110 S, which is a stack of a plurality of flat batteries 110, housed in a module case 120. The module case 120 is composed of four plate members and also functions as a pressurizing unit that pressurizes the battery stack 110S. The plurality of batteries 110 are electrically connected by the bus bar unit 130 while being pressurized by the module case 120. Although not shown, an adhesive or a pressure sensitive adhesive is applied between the stacked batteries 110.
　図３は、電池モジュール１００の要部を断面で示す側面図である。図４は、電池スタック１１０Ｓの一の電池１１０を示す斜視図である。図３および図４を参照して、電池１１０は、例えば、扁平なリチウムイオン二次電池である。電池１１０は、発電要素１１１を一対のラミネートフィルム１１２によって封止した本体部１１０Ｈと、一対の電極タブ１１３と、を有している。発電要素１１１は、正極と負極とをセパレータを介して積層して形成されている。発電要素１１１は、電解液とともにラミネートフィルム１１２によって封止されている。 FIG. 3 is a side view showing a cross section of a main part of the battery module 100. FIG. 4 is a perspective view showing one battery 110 of the battery stack 110S. Referring to FIGS. 3 and 4, battery 110 is, for example, a flat lithium ion secondary battery. The battery 110 has a main body 110H in which the power generation element 111 is sealed with a pair of laminate films 112, and a pair of electrode tabs 113. The power generation element 111 is formed by stacking a positive electrode and a negative electrode via a separator. The power generation element 111 is sealed with a laminate film 112 together with the electrolytic solution.
　ラミネートフィルム１１２は、絶縁性を備えたシートによって金属箔の両側を覆って構成されている。ラミネートフィルム１１２は、長手方向Ｘに沿った両端部１１２ｄを、積層方向Ｚの上方に向かって折り曲げて形成している。 The laminate film 112 is configured by covering both sides of the metal foil with an insulating sheet. The laminate film 112 is formed by bending both ends 112d along the longitudinal direction X upward in the stacking direction Z.
　図３を参照して、電極タブ１１３は、発電要素１１１に電気的に接続され、ラミネートフィルム１１２から外部に導出されている。図４を参照して、電極タブ１１３は、アノード側電極タブ１１３Ａと、カソード側電極タブ１１３Ｋとを有している。アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋはともに、ラミネートフィルム１１２の短手方向Ｙに沿う一端部から、長手方向Ｘに沿う一方向（図４において左手前側）に向かって伸びている。なお、本明細書では、電極タブ１１３と称する場合、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの両方を意味するものとする。 Referring to FIG. 3, the electrode tab 113 is electrically connected to the power generation element 111 and is led out from the laminate film 112 to the outside. With reference to FIG. 4, the electrode tab 113 has an anode side electrode tab 113A and a cathode side electrode tab 113K. Both the anode-side electrode tab 113A and the cathode-side electrode tab 113K extend from one end of the laminate film 112 along the lateral direction Y toward one direction along the longitudinal direction X (left front side in FIG. 4). In this specification, the term "electrode tab 113" means both the anode-side electrode tab 113A and the cathode-side electrode tab 113K.
　図３および図４を参照して、電極タブ１１３は、基端部１１３ｃから先端部１１３ｄにかけてＬ字形状に曲げ成形されている。後述する本実施形態の電極タブ１１３の成形装置１０は、平板状の電極タブ１１３をＬ字形状に折り曲げ成形するための装置である。曲げ成形することによって、電極タブ１１３の先端部１１３ｄは、バスバー１３２と対面するように平面状に形成されている。なお、電極タブ１１３の形状は図示したＬ字形状に限定されない、バスバー１３２の形状との関係において、適宜の形状を有する。 Referring to FIGS. 3 and 4, the electrode tab 113 is bent and formed in an L shape from the base end portion 113c to the tip end portion 113d. A molding device 10 for the electrode tab 113 according to the present embodiment, which will be described later, is a device for bending the plate-shaped electrode tab 113 into an L-shape. By bending, the tip portion 113d of the electrode tab 113 is formed in a flat shape so as to face the bus bar 132. Note that the shape of the electrode tab 113 is not limited to the L-shape shown in the figure, and has an appropriate shape in relation to the shape of the bus bar 132.
　アノード側電極タブ１１３Ａの形成材料は、特に限定されないが、例えば、アルミニウムを用いることができる。カソード側電極タブ１１３Ｋの形成材料は、特に限定されないが、例えば、銅を用いることができる。また、アノード側電極タブ１１３Ａの厚さｔ１は、特に限定されないが、例えば、０．４ｍｍである。また、カソード側電極タブ１１３Ｋの厚さｔ２は、特に限定されないが、例えば、０．２ｍｍである。また、カソード側電極タブ１１３Ｋの先端部１１３ｄの一部は、折り返して密着させた折り返し部１１３ｅを備える。折り返し部１１３ｅは、厚さが基端部１１３ｃに比べて２倍である。これにより、アノード側電極タブ１１３Ａの先端部１１３ｄとカソード側電極タブ１１３Ｋの先端部１１３ｄの厚さを同程度とすることができるため、バスバー１３２との溶接条件をアノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋにおいてほぼ同じ条件に設定することができる。その結果、製造性を向上することができる。 The material for forming the anode-side electrode tab 113A is not particularly limited, but, for example, aluminum can be used. The material for forming the cathode-side electrode tab 113K is not particularly limited, but copper can be used, for example. The thickness t1 of the anode-side electrode tab 113A is not particularly limited, but is 0.4 mm, for example. The thickness t2 of the cathode-side electrode tab 113K is not particularly limited, but is 0.2 mm, for example. Further, a part of the tip portion 113d of the cathode-side electrode tab 113K includes a folded-back portion 113e that is folded back and brought into close contact. The folded-back portion 113e is twice as thick as the base end portion 113c. As a result, the thickness of the tip portion 113d of the anode-side electrode tab 113A and the tip portion 113d of the cathode-side electrode tab 113K can be made approximately the same, and therefore the welding conditions for the bus bar 132 are set to the anode-side electrode tab 113A and the cathode side. The electrode tab 113K can be set under substantially the same conditions. As a result, manufacturability can be improved.
　図４を参照して、電池１１０は、電極タブ１１３を備えた側が一対の第１スペーサー１１４によって支持され、電極タブ１１３を備えていない側が一対の第２スペーサー１１５によって支持されている。電池１１０は、各スペーサー１１４、１１５によって支持された状態において積層される。第１スペーサー１１４には、ラミネートフィルム１１２の連結孔（図示省略）に挿通される連結ピン１１４ａが形成され、第２スペーサー１１５には、連結孔（図示省略）に挿通される連結ピン１１５ａが形成されている。連結ピン１１４ａ、１１５ａの先端を熱カシメすることによって、各スペーサー１１４、１１５は、ラミネートフィルム１１２に接続される。各スペーサー１１４、１１５は、絶縁性を備えた強化プラスチックスから形成される。 Referring to FIG. 4, in the battery 110, the side provided with the electrode tab 113 is supported by the pair of first spacers 114, and the side not provided with the electrode tab 113 is supported by the pair of second spacers 115. The batteries 110 are stacked while being supported by the spacers 114 and 115. The first spacer 114 has a connecting pin 114a which is inserted into a connecting hole (not shown) of the laminate film 112, and the second spacer 115 has a connecting pin 115a which is inserted into a connecting hole (not shown). Has been done. The spacers 114, 115 are connected to the laminate film 112 by thermally caulking the tips of the connecting pins 114a, 115a. Each of the spacers 114 and 115 is formed of a reinforced plastic having an insulating property.
　第１スペーサー１１４は、その長手方向（短手方向Ｙ）の両端に載置部１１４ｂを有し、第２スペーサー１１５は、その長手方向（短手方向Ｙ）の両端に載置部１１５ｂを有している。電池１１０を積層するとき、第１スペーサー１１４は、積層方向に隣り合う載置部１１４ｂ同士が接触し、第２スペーサー１１５は、積層方向に隣り合う載置部１１５ｂ同士が接触する。載置部１１４ｂ、１１５ｂの上面には、ピン１１４ｃ、１１５ｃが形成されている。載置部１１４ｂの下面には、ピン１１４ｃの位置に対応した穴１１４ｄが形成されている（図３を参照）。載置部１１５ｂの下面にも同様に、ピン１１５ｃの位置に対応した穴（図示省略）が形成されている。載置部１１４ｂ、１１５ｂには、通しボルトを挿通する貫通孔１１４ｅ、１１５ｅが形成されている。第１スペーサー１１４は、図３に示すように、電極タブ１１３の先端部１１３ｄをバスバー１３２とは反対側から支持する支持部材１１４ｆを有している。 The first spacer 114 has mounting portions 114b at both ends in the longitudinal direction (transverse direction Y), and the second spacer 115 has mounting portions 115b at both ends in the longitudinal direction (transverse direction Y). doing. When stacking the batteries 110, the first spacers 114 contact the mounting portions 114b adjacent to each other in the stacking direction, and the second spacers 115 contact the mounting portions 115b adjacent to each other in the stacking direction. Pins 114c and 115c are formed on the upper surfaces of the mounting portions 114b and 115b. A hole 114d corresponding to the position of the pin 114c is formed on the lower surface of the mounting portion 114b (see FIG. 3). Similarly, a hole (not shown) corresponding to the position of the pin 115c is formed on the lower surface of the mounting portion 115b. Through holes 114e and 115e for inserting the through bolts are formed in the mounting portions 114b and 115b. As shown in FIG. 3, the first spacer 114 has a support member 114f that supports the tip portion 113d of the electrode tab 113 from the side opposite to the bus bar 132.
　図２を参照して、モジュールケース１２０は、電池スタック１１０Ｓの各々の電池１１０の発電要素１１１を上下から加圧する上部加圧板１２１と下部加圧板１２２、および電池スタック１１０Ｓを加圧した状態の上部加圧板１２１および下部加圧板１２２を固定する一対の側板１２３を含んでいる。上部加圧板１２１は、電池モジュール１００を図示しないパックケースに対して固定する締結ボルトを挿入するロケート孔１２１ｂが形成されている。下部加圧板１２２も同様に、締結ボルトを挿入するロケート孔１２２ｂが形成されている。一対の側板１２３は、上部加圧板１２１および下部加圧板１２２に対して溶接している。モジュールケース１２０の形成材料は、特に限定されないが、例えば、ステンレスなどから形成することができる。 Referring to FIG. 2, the module case 120 includes an upper pressing plate 121 and a lower pressing plate 122 that press the power generating elements 111 of the respective batteries 110 of the battery stack 110S from above and below, and an upper part of the battery stack 110S in a pressed state. It includes a pair of side plates 123 for fixing the pressure plate 121 and the lower pressure plate 122. The upper pressure plate 121 has a locate hole 121b into which a fastening bolt for fixing the battery module 100 to a pack case (not shown) is inserted. Similarly, the lower pressure plate 122 has a locate hole 122b into which a fastening bolt is inserted. The pair of side plates 123 are welded to the upper pressure plate 121 and the lower pressure plate 122. The material for forming the module case 120 is not particularly limited, but can be formed of, for example, stainless steel.
　バスバーユニット１３０は、上下に並んだ電池１１０の電極タブ１１３を電気的に接続するバスバー１３２と、複数のバスバー１３２を一体的に保持するバスバーホルダ１３１と、バスバー１３２を保護する保護カバー１３５とを有する。バスバーユニット１３０はさらに、電気的に接続された複数の電池１１０のアノード側の終端を外部の入出力端子に臨ませるアノード側ターミナル１３３と、カソード側の終端を外部の入出力端子に臨ませるカソード側ターミナル１３４とを有する。 The bus bar unit 130 includes a bus bar 132 that electrically connects the electrode tabs 113 of the batteries 110 that are vertically arranged, a bus bar holder 131 that integrally holds the plurality of bus bars 132, and a protective cover 135 that protects the bus bar 132. Have. The bus bar unit 130 further includes an anode-side terminal 133 that makes the anode-side ends of the plurality of electrically connected batteries 110 face external input/output terminals, and a cathode that makes the cathode-side ends face external input/output terminals. And a side terminal 134.
　図３に示すように、積層した電池１１０の電極タブ１１３にバスバー１３２をレーザー接合するときには、図示しないレーザー発振器は、バスバー１３２にレーザー光ＬＢを照射する。バスバー１３２と電極タブ１１３の先端部１１３ｄとは、シーム溶接またはスポット溶接によって接合される。電極タブ１１３とバスバー１３２とをレーザー溶接する場合、高品位の溶接品質を確保するために、電極タブ１１３とバスバー１３２との間に隙間が生じないように、電極タブ１１３の位置とバスバー１３２の位置を管理しなければならない。電極タブ１１３の曲げ角度などの形状にばらつきがあると、電極タブ１１３の先端部１１３ｄの位置が積層方向にばらつくおそれがある。このため、電池１１０を電極タブ１１３の加工位置に高精度に位置決めし、電極タブ１１３の加工精度を向上することが必要である。 As shown in FIG. 3, when the bus bar 132 is laser-bonded to the electrode tabs 113 of the stacked batteries 110, a laser oscillator (not shown) irradiates the bus bar 132 with the laser beam LB. The bus bar 132 and the tip portion 113d of the electrode tab 113 are joined by seam welding or spot welding. When laser welding the electrode tab 113 and the bus bar 132, in order to ensure high quality welding quality, the position of the electrode tab 113 and the bus bar 132 should be adjusted so that no gap is created between the electrode tab 113 and the bus bar 132. You have to manage your location. If there is variation in the shape such as the bending angle of the electrode tab 113, the position of the tip portion 113d of the electrode tab 113 may vary in the stacking direction. Therefore, it is necessary to position the battery 110 at the processing position of the electrode tab 113 with high accuracy and improve the processing accuracy of the electrode tab 113.
　［電極タブ１１３の成形装置１０］
　本実施形態に係る電極タブ１１３の成形装置１０を説明する。図５Ａは、電極タブ１１３の成形装置１０の構成を模式的に示す側面図、図５Ｂは、図５Ａに示す電極タブ１１３の成形装置１０の一部を示す正面図である。 [Molding Device 10 for Electrode Tab 113]
The molding device 10 for the electrode tab 113 according to this embodiment will be described. 5A is a side view schematically showing the configuration of the molding apparatus 10 for the electrode tab 113, and FIG. 5B is a front view showing a part of the molding apparatus 10 for the electrode tab 113 shown in FIG. 5A.
　電極タブ１１３の成形装置１０は、電池１１０のアノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋをそれぞれ曲げ成形して折れ曲がり部１１３Ｒを形成する成形装置である。図５Ａ、図５Ｂ、および図５Ｃを参照して、電極タブ１１３の成形装置１０は、概説すると、ダイ２０と、パンチ３０と、上部保持部４０と、下部保持部４５と、駆動部５０、５１と、曲げ角度調整部６０と、押さえ部７０と、成形装置１０の各部の作動を制御する制御部８０と、を有する。以下、各部の構成について詳述する。 The forming device 10 for the electrode tab 113 is a forming device for forming the bent portion 113R by bending the anode side electrode tab 113A and the cathode side electrode tab 113K of the battery 110, respectively. With reference to FIGS. 5A, 5B, and 5C, the molding apparatus 10 for the electrode tab 113 is roughly described. The die 20, the punch 30, the upper holding unit 40, the lower holding unit 45, and the driving unit 50. 51, a bending angle adjusting unit 60, a pressing unit 70, and a control unit 80 that controls the operation of each unit of the molding apparatus 10. Hereinafter, the configuration of each unit will be described in detail.
　（ダイ２０）
　図５Ａ、図５Ｂ、および図５Ｃを参照して、ダイ２０は、一対の電極タブ１１３のうちのアノード側電極タブ１１３Ａ（一方の電極タブに相当）の基端部１１３ｃを支持する第１支持面２４ａを備える第１ダイ２１と、カソード側電極タブ１１３Ｋ（他方の電極タブに相当）の基端部１１３ｃを支持する第２支持面２４ｂを備える第２ダイ２２と、を有する。第１ダイ２１は、第１支持面２４ａの端部に角部２３ａを有する。角部２３ａの角度αは、鋭角である。これにより、アノード側電極タブ１１３Ａを曲げ成形する際に、スプリングバックの影響を考慮して、アノード側電極タブ１１３Ａを９０度よりも大きな角度で曲げることができる。第２ダイ２２は、第２支持面２４ｂの端部に角部２３ｂを有する。角部２３ｂの角度βは、鋭角である。これにより、カソード側電極タブ１１３Ｋを曲げ成形する際に、スプリングバックの影響を考慮して、カソード側電極タブ１１３Ｋを９０度よりも大きな角度で曲げることができる。角部２３ａの角度αおよび角部２３ｂの角度βは、電極タブ１１３の材質や厚さなどの条件に合わせてそれぞれ異なる角度に設定されている。なお、本明細書では、ダイ２０と称する場合、第１ダイ２１および第２ダイ２２の両方を意味するものとする。 (Die 20)
5A, 5B, and 5C, the die 20 includes a first support that supports a base end portion 113c of the anode-side electrode tab 113A (corresponding to one electrode tab) of the pair of electrode tabs 113. It has the 1st die 21 provided with the surface 24a, and the 2nd die 22 provided with the 2nd support surface 24b which supports the base end part 113c of the cathode side electrode tab 113K (equivalent to the other electrode tab). The first die 21 has a corner portion 23a at the end of the first support surface 24a. The angle α of the corner portion 23a is an acute angle. This allows the anode-side electrode tab 113A to be bent at an angle larger than 90 degrees in consideration of the effect of springback when the anode-side electrode tab 113A is bent. The second die 22 has a corner 23b at the end of the second support surface 24b. The angle β of the corner portion 23b is an acute angle. Accordingly, when the cathode side electrode tab 113K is bent, the cathode side electrode tab 113K can be bent at an angle larger than 90 degrees in consideration of the influence of spring back. The angle α of the corner portion 23a and the angle β of the corner portion 23b are set to different angles according to conditions such as the material and thickness of the electrode tab 113. In this specification, the term “die 20” means both the first die 21 and the second die 22.
　（パンチ３０）
　図５Ａ、図５Ｂ、および図５Ｃを参照して、パンチ３０は、第１ダイ２１と協働してアノード側電極タブ１１３Ａを曲げ成形する第１パンチ３１と、第２ダイ２２と協働してカソード側電極タブ１１３Ｋを曲げ成形する第２パンチ３２と、を有する。なお、本明細書では、パンチ３０と称する場合、第１パンチ３１および第２パンチ３２の両方を意味するものとする。 (Punch 30)
5A, 5B, and 5C, the punch 30 cooperates with the first die 21 to bend and form the anode-side electrode tab 113A, and the punch 30 cooperates with the second die 22. And a second punch 32 for bending the cathode side electrode tab 113K. In the present specification, the term “punch 30” means both the first punch 31 and the second punch 32.
　図５Ｃを参照して、パンチ３０を第１支持面２４ａおよび第２支持面２４ｂに対して直交する第１方向Ｄ１（本実施形態では電池１１０の積層方向Ｚ）において、第１パンチ３１の長さＬ１は、第２パンチ３２の第１方向Ｄ１に沿う長さＬ２よりも長い。また、第１パンチ３１の長さＬ１と第２パンチ３２の長さＬ２の差ΔＬは、アノード側電極タブ１１３Ａの厚さｔ１よりも大きく設定されている。本実施形態では、長さの差ΔＬは、１ｍｍ（＞ｔ１＝０．４ｍｍ）としている。 Referring to FIG. 5C, the length of the first punch 31 in the first direction D1 (in the present embodiment, the stacking direction Z of the battery 110 in the present embodiment) orthogonal to the first support surface 24a and the second support surface 24b. The length L1 is longer than the length L2 of the second punch 32 along the first direction D1. The difference ΔL between the length L1 of the first punch 31 and the length L2 of the second punch 32 is set to be larger than the thickness t1 of the anode electrode tab 113A. In this embodiment, the length difference ΔL is set to 1 mm (>t1=0.4 mm).
　第１パンチ３１および第２パンチ３２は、長さ以外はほぼ同様の構成を有する。図５Ａを参照して、第１パンチ３１は、アノード側電極タブ１１３Ａの曲げ成形時において、アノード側電極タブ１１３Ａを押圧して曲げ加工する押圧面３３ａと、後述する第１バックアッププレート６３ａの傾斜面６５ａと摺接する摺接面３４ａと、を有する。図５Ｂを参照して、第２パンチ３２は、カソード側電極タブ１１３Ｋの曲げ成形時において、カソード側電極タブ１１３Ｋを押圧して曲げ加工する押圧面３３ｂと、後述する第２バックアッププレート６３ｂの傾斜面６５ｂと摺接する摺接面３４ｂと、を有する。 The first punch 31 and the second punch 32 have substantially the same configuration except the length. Referring to FIG. 5A, the first punch 31 has a pressing surface 33a that presses and bends the anode-side electrode tab 113A during bending of the anode-side electrode tab 113A, and an inclination of a first backup plate 63a described later. And a sliding contact surface 34a that is in sliding contact with the surface 65a. Referring to FIG. 5B, the second punch 32 has a pressing surface 33b that presses and bends the cathode-side electrode tab 113K when bending the cathode-side electrode tab 113K, and an inclination of a second backup plate 63b described later. And a sliding contact surface 34b that is in sliding contact with the surface 65b.
　第１方向Ｄ１に直交する方向（本実施形態では電池１１０の長手方向Ｘ）をパンチ３０の幅方向としたとき、パンチ３０の先端部３０ｄの幅Ｗ１は、基端部３０ｃの幅Ｗ２よりも小さくなるように形成されている。これにより、パンチ３０の先端部３０ｄは、後述する上部保持部４０のパンチプレート４１との間に隙間Ｇを有する。 When the direction orthogonal to the first direction D1 (the longitudinal direction X of the battery 110 in the present embodiment) is the width direction of the punch 30, the width W1 of the tip 30d of the punch 30 is larger than the width W2 of the base 30c. It is formed to be small. As a result, the tip portion 30d of the punch 30 has a gap G between the punch plate 41 of the upper holding portion 40 described later.
　（上部保持部４０）
　図５Ａ、図５Ｂ、および図５Ｃを参照して、上部保持部４０は、パンチ３０の基端部３０ｃの変形を制限するパンチプレート４１と、第１パンチ３１および第２パンチ３２の各々の基端部３０ｃ（一端部に相当）およびパンチプレート４１を保持する保持プレート４２と、を有する。また、第１パンチ３１および第２パンチ３２は、パンチプレート４１との間に図示しない絶縁部材が配置されている。絶縁部材は、第１パンチ３１と第２パンチ３２とがパンチプレート４１等を介して電気的に接続されることを防止する。 (Upper holding part 40)
5A, 5B, and 5C, the upper holding unit 40 includes a punch plate 41 that limits deformation of the base end portion 30c of the punch 30, and a base of each of the first punch 31 and the second punch 32. An end portion 30c (corresponding to one end portion) and a holding plate 42 that holds the punch plate 41 are included. Further, the first punch 31 and the second punch 32 are provided with an insulating member (not shown) between them and the punch plate 41. The insulating member prevents the first punch 31 and the second punch 32 from being electrically connected via the punch plate 41 or the like.
　パンチプレート４１は、パンチ３０の基端部３０ｃと面接触し、パンチ３０の基端部３０ｃが第１方向Ｄ１に交差する方向に変形することを制限する機能を有する。また、パンチプレート４１は、上述したようにパンチ３０の先端部３０ｄとの間に隙間Ｇを介して配置される。これにより、パンチプレート４１は、隙間Ｇの分だけパンチ３０の先端部３０ｄをダイ２０側に向かう方向へ変形可能にするとともに、パンチ３０の先端部３０ｄの可動域を制限する機能を有している。 The punch plate 41 has a function of making surface contact with the base end portion 30c of the punch 30 and limiting the deformation of the base end portion 30c of the punch 30 in the direction intersecting the first direction D1. The punch plate 41 is arranged with the gap G between the punch plate 41 and the tip portion 30d of the punch 30 as described above. As a result, the punch plate 41 has a function of allowing the tip portion 30d of the punch 30 to be deformed toward the die 20 side by the amount of the gap G, and having a function of limiting the movable range of the tip portion 30d of the punch 30. There is.
　保持プレート４２は、パンチ３０にかかる加工荷重に対して補強機能および耐摩耗性を備えるバッキングプレート４２ａと、駆動部５０に接続されるパンチホルダー４２ｂと、を有する。バッキングプレート４２ａは、例えば、焼入れ硬化が施され、耐摩耗性を有する金属によって形成される。パンチホルダー４２ｂは、図示しない絶縁構造のボルト等の締結部材を介してパンチ３０の基端部３０ｃを固定している。 The holding plate 42 has a backing plate 42a having a reinforcing function and wear resistance against a processing load applied to the punch 30, and a punch holder 42b connected to the drive unit 50. The backing plate 42a is, for example, hardened and formed of a metal having wear resistance. The punch holder 42b fixes the base end portion 30c of the punch 30 via a fastening member such as a bolt having an insulating structure (not shown).
　（下部保持部４５）
　図５Ａ、図５Ｂ、および図５Ｃを参照して、下部保持部４５は、第１ダイ２１、第２ダイ２２、第１バックアッププレート６３ａ、および第２バックアッププレート６３ｂの下端部を絶縁部材４６を介して保持する下部ホルダー４７を有する。アノード側電極タブ１１３Ａは、第１ダイ２１および第１バックアッププレート６３ａに接触し、カソード側電極タブ１１３Ｋは、第２ダイ２２および第２バックアッププレート６３ｂに接触する。絶縁部材４６は、アノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋとがダイ２０等を介して電気的に接続されることを防止する。下部ホルダー４７は、駆動部５１に接続される。下部ホルダー４７は、図示しない絶縁構造のボルト等の締結部材を介して第１ダイ２１、第２ダイ２２、第１バックアッププレート６３ａ、および第２バックアッププレート６３ｂの下端部を固定している。 (Lower holding part 45)
Referring to FIGS. 5A, 5B, and 5C, the lower holding unit 45 attaches the insulating member 46 to the lower ends of the first die 21, the second die 22, the first backup plate 63a, and the second backup plate 63b. It has a lower holder 47 that holds it through. The anode side electrode tab 113A contacts the first die 21 and the first backup plate 63a, and the cathode side electrode tab 113K contacts the second die 22 and the second backup plate 63b. The insulating member 46 prevents the anode side electrode tab 113A and the cathode side electrode tab 113K from being electrically connected via the die 20 or the like. The lower holder 47 is connected to the drive unit 51. The lower holder 47 fixes the lower ends of the first die 21, the second die 22, the first backup plate 63a, and the second backup plate 63b via fastening members such as bolts having an insulating structure (not shown).
　（駆動部５０）
　駆動部５０は、第１ダイ２１の第１支持面２４ａおよび第２ダイ２２の第２支持面２４ｂに対して直交する第１方向Ｄ１に沿って第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して相対的に移動させる。駆動部５０は、上部保持部４０を第１方向Ｄ１（図５Ａ、図５Ｂ、および図５Ｃにおいて下方向）に移動させる。駆動部５０は、例えば、サーボプレスや機械プレス等によって構成される。駆動部５０が上部保持部４０を第１方向Ｄ１に移動させることによって、上部保持部４０に保持されたパンチ３０が第１方向Ｄ１に移動する。これによって、パンチ３０は、ダイ２０に対して相対的に接近離反移動する。駆動部５０によって第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して相対的に移動させる１つの動作の間に、一方の電極タブ（アノード側電極タブ１１３Ａ）および他方の電極タブ（カソード側電極タブ１１３Ｋ）の曲げ成形のタイミングをずらしている。第１パンチ３１および第２パンチ３２を一体として移動させることから、第１パンチ３１および第２パンチ３２の相対的な位置関係を維持して、電極タブ１１３を曲げ成形するときの精度を高めることができる。 (Drive unit 50)
The drive unit 50 integrally includes the first punch 31 and the second punch 32 along a first direction D1 orthogonal to the first support surface 24a of the first die 21 and the second support surface 24b of the second die 22. It is moved relative to the first die 21 and the second die 22. The drive unit 50 moves the upper holding unit 40 in the first direction D1 (downward in FIGS. 5A, 5B, and 5C). The drive unit 50 is composed of, for example, a servo press or a mechanical press. The driving unit 50 moves the upper holding unit 40 in the first direction D1, so that the punch 30 held by the upper holding unit 40 moves in the first direction D1. As a result, the punch 30 moves toward and away from the die 20 relatively. During one operation in which the driving unit 50 moves the first punch 31 and the second punch 32 as a unit relative to the first die 21 and the second die 22, one electrode tab (the anode-side electrode tab 113A) is moved. ) And the other electrode tab (cathode side electrode tab 113K) are bent at different timings. Since the first punch 31 and the second punch 32 are moved as a unit, the relative positional relationship between the first punch 31 and the second punch 32 is maintained, and the accuracy when bending the electrode tab 113 is increased. You can
　（駆動部５１）
　駆動部５１は、下部保持部４５を第１方向Ｄ１と反対方向（図５Ａ、図５Ｂ、および図５Ｃにおいて上方向）に移動させる。駆動部５１は、例えば、サーボプレスや機械プレス等によって構成される。駆動部５１が下部保持部４５を第１方向Ｄ１と反対方向に移動させることによって、下部保持部４５に保持されたダイ２０が第１方向Ｄ１に移動する。これによって、ダイ２０は、パンチ３０に対して相対的に接近離反移動する。本実施形態においては、駆動部５１によって第１ダイ２１および第２ダイ２２を一体として移動させている。第１ダイ２１および第２ダイ２２を一体として移動させることから、第１ダイ２１および第２ダイ２２の相対的な位置関係を維持して、電極タブ１１３を曲げ成形するときの精度を高めることができる。 (Drive unit 51)
The drive unit 51 moves the lower holding unit 45 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C). The drive unit 51 is composed of, for example, a servo press or a mechanical press. The driving unit 51 moves the lower holding unit 45 in the direction opposite to the first direction D1, so that the die 20 held by the lower holding unit 45 moves in the first direction D1. As a result, the die 20 moves toward and away from the punch 30 relatively. In the present embodiment, the driving unit 51 moves the first die 21 and the second die 22 as a unit. Since the first die 21 and the second die 22 are moved as a unit, the relative positional relationship between the first die 21 and the second die 22 is maintained, and the accuracy when bending the electrode tab 113 is increased. You can
　本実施形態にあっては、駆動部５０がパンチ３０を移動させ、駆動部５１がダイ２０を移動させる。ただし、電極タブ１１３の曲げ成形は、パンチ３０とダイ２０とを相対的に接近移動させれば行うことができる。このため、パンチ３０のみをダイ２０に向けて移動させたり、逆に、ダイ２０のみをパンチ３０に向けて移動させたりして、電極タブ１１３を曲げ成形できる。 In the present embodiment, the drive unit 50 moves the punch 30, and the drive unit 51 moves the die 20. However, the bending of the electrode tab 113 can be performed by moving the punch 30 and the die 20 relatively closer to each other. Therefore, the electrode tab 113 can be bent by moving only the punch 30 toward the die 20 or, conversely, moving only the die 20 toward the punch 30.
　（曲げ角度調整部６０）
　図５Ａ、図５Ｂ、および図５Ｃを参照して、曲げ角度調整部６０は、アノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度θａを調整する第１曲げ角度調整部６１と、カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度θｂを調整する第２曲げ角度調整部６２と、を有する。第１曲げ角度調整部６１は、第１方向Ｄ１へ移動した第１パンチ３１によって曲げ成形されたアノード側電極タブ１１３Ａを追い込み曲げ加工する。第２曲げ角度調整部６２は、第１方向Ｄ１へ移動した第２パンチ３２によって曲げ成形されたカソード側電極タブ１１３Ｋを追い込み曲げ加工する。第１曲げ角度調整部６１は、傾斜面６５ａを備える第１バックアッププレート６３ａと、第１ダイ２１の第１支持面２４ａに対する第１バックアッププレート６３ａの高さを調整する第１高さ調整部６４ａと、を有する。第２曲げ角度調整部６２は、傾斜面６５ｂを備える第２バックアッププレート６３ｂと、第２ダイ２２の第２支持面２４ｂに対する第２バックアッププレート６３ｂの高さを調整する第２高さ調整部６４ｂと、を有する。本実施形態では、第１高さ調整部６４ａおよび第２高さ調整部６４ｂは、省スペースな構成するために、例えば、１または複数の調整スペーサーが組み込まれている。厚みの異なる調整スペーサーを組み合わせることによって、第１バックアッププレート６３ａおよび第２バックアッププレート６３ｂの高さを調整できる。なお、本明細書では、曲げ角度調整部６０と称する場合、第１曲げ角度調整部６１および第２曲げ角度調整部６２の両方を意味するものとする。 (Bending angle adjusting unit 60)
5A, 5B, and 5C, the bending angle adjusting unit 60 includes a first bending angle adjusting unit 61 for adjusting the bending angle θa of the bending portion 113R of the anode-side electrode tab 113A, and a cathode-side electrode tab. And a second bending angle adjusting portion 62 for adjusting the bending angle θb of the bending portion 113R of 113K. The first bending angle adjusting unit 61 drives in and bends the anode-side electrode tab 113A bent by the first punch 31 moved in the first direction D1. The second bending angle adjusting section 62 drives in the cathode side electrode tab 113K bent by the second punch 32 moved in the first direction D1 to perform bending processing. The first bending angle adjuster 61 includes a first backup plate 63a having an inclined surface 65a and a first height adjuster 64a for adjusting the height of the first backup plate 63a with respect to the first support surface 24a of the first die 21. And. The second bending angle adjuster 62 includes a second backup plate 63b having an inclined surface 65b and a second height adjuster 64b for adjusting the height of the second backup plate 63b with respect to the second support surface 24b of the second die 22. And. In the present embodiment, the first height adjusting unit 64a and the second height adjusting unit 64b have, for example, one or a plurality of adjusting spacers incorporated therein in order to save space. The heights of the first backup plate 63a and the second backup plate 63b can be adjusted by combining adjustment spacers having different thicknesses. In this specification, the term “bending angle adjusting section 60” means both the first bending angle adjusting section 61 and the second bending angle adjusting section 62.
　図５Ａの破線部分を参照して、第１パンチ３１を第１方向Ｄ１（図５Ａの下方向）に移動させ、第１ダイ２１を第１方向Ｄ１と反対方向（図５Ａの上方向）に移動させると、第１パンチ３１と第１ダイ２１とが接近移動し、第１パンチ３１の摺接面３４ａは、第１バックアッププレート６３ａの傾斜面６５ａと摺接する。そして、第１パンチ３１の摺接面３４ａは、傾斜面６５ａに沿って摺動し、第１方向Ｄ１（積層方向Ｚ）に対して交差する第２方向Ｄ２へ移動する。上述したように第１パンチ３１の先端部３０ｄは、パンチプレート４１との間の隙間Ｇの分だけ第１ダイ２１側に変形できるように構成されている。そのため、第１パンチ３１の先端部３０ｄは、第１ダイ２１側に向かう第２方向（図５Ａでは右下方向）へ撓むように変形する。第１パンチ３１の先端部３０ｄの変形に伴って、アノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度θａはさらに大きくなる。このようにして、第１曲げ角度調整部６１は、アノード側電極タブ１１３Ａの曲げ角度θａを調整する。 5A, the first punch 31 is moved in the first direction D1 (downward in FIG. 5A), and the first die 21 is moved in the direction opposite to the first direction D1 (upward in FIG. 5A). When moved, the first punch 31 and the first die 21 move closer to each other, and the sliding contact surface 34a of the first punch 31 makes sliding contact with the inclined surface 65a of the first backup plate 63a. Then, the sliding contact surface 34a of the first punch 31 slides along the inclined surface 65a and moves in the second direction D2 intersecting the first direction D1 (stacking direction Z). As described above, the tip portion 30d of the first punch 31 is configured to be deformable toward the first die 21 side by the gap G between the first punch 31 and the punch plate 41. Therefore, the tip portion 30d of the first punch 31 is deformed so as to bend in the second direction (downward right direction in FIG. 5A) toward the first die 21 side. With the deformation of the tip portion 30d of the first punch 31, the bending angle θa of the bent portion 113R of the anode-side electrode tab 113A further increases. In this way, the first bending angle adjusting section 61 adjusts the bending angle θa of the anode-side electrode tab 113A.
　図５Ｂの破線部分を参照して、第２パンチ３２を第１方向Ｄ１（図５Ｂの下方向）に移動させ、第２ダイ２２を第１方向Ｄ１と反対方向（図５Ｂの上方向）に移動させると、第２パンチ３２と第２ダイ２２とが接近移動し、第２パンチ３２の摺接面３４ａは、第２バックアッププレート６３ｂの傾斜面６５ｂと摺接する。そして、第２パンチ３２の摺接面３４ｂは、傾斜面６５ｂに沿って摺動し、第１方向Ｄ１（積層方向Ｚ）に対して交差する第３方向Ｄ３へ移動する。上述したように第２パンチ３２の先端部３０ｄは、パンチプレート４１との間の隙間Ｇの分だけ第２ダイ２２側に変形できるように構成されている。そのため、第２パンチ３２の先端部３０ｄは、第２ダイ２２側に向かう第３方向（図５Ｂでは右下方向）へ撓むように変形する。第２パンチ３２の先端部３０ｄの変形に伴って、カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度θｂはさらに大きくなる。このようにして、第２曲げ角度調整部６２は、カソード側電極タブ１１３Ｋの曲げ角度θｂを調整する。 5B, the second punch 32 is moved in the first direction D1 (downward in FIG. 5B), and the second die 22 is moved in the direction opposite to the first direction D1 (upward in FIG. 5B). When moved, the second punch 32 and the second die 22 move closer to each other, and the sliding contact surface 34a of the second punch 32 makes sliding contact with the inclined surface 65b of the second backup plate 63b. Then, the sliding contact surface 34b of the second punch 32 slides along the inclined surface 65b and moves in the third direction D3 intersecting the first direction D1 (stacking direction Z). As described above, the tip portion 30d of the second punch 32 is configured to be deformable toward the second die 22 side by the gap G between the second punch 32 and the punch plate 41. Therefore, the tip portion 30d of the second punch 32 is deformed so as to bend in the third direction (downward right direction in FIG. 5B) toward the second die 22 side. With the deformation of the tip portion 30d of the second punch 32, the bending angle θb of the bent portion 113R of the cathode-side electrode tab 113K further increases. In this way, the second bending angle adjusting section 62 adjusts the bending angle θb of the cathode side electrode tab 113K.
　（押さえ部７０）
　押さえ部７０は、パンチ３０によって電極タブ１１３の先端部１１３ｄを曲げ加工する際に、電極タブ１１３の基端部１１３ｃをダイ２０に対して押し付けて保持し、電極タブ１１３がパンチ３０による加工方向（第１方向Ｄ１、第２方向Ｄ２、および第３方向Ｄ３）に引きずり込まれて位置ずれすることを防止する機能を有する。押さえ部７０は、上部保持部４０に固定された固定部７１に第１方向Ｄ１へ相対的に移動可能に支持されている。固定部７１と押さえ部７０との間には付勢部材７２が配置され、押さえ部７０を第１方向Ｄ１へ付勢している。また、押さえ部７０は、アノード側電極タブ１１３Ａを押さえる部分と、カソード側電極タブ１１３Ｋを押さえる部分との間に図示しない絶縁構造が配置されている。絶縁構造は、押さえ部７０におけるアノード側電極タブ１１３Ａを押さえる部分と、カソード側電極タブ１１３Ｋを押さえる部分とが電気的に導通しないように、２つの部分の間を電気的に絶縁する。固定部７１および付勢部材７２についても、押さえ部７０におけるアノード側電極タブ１１３Ａを押さえる部分と、カソード側電極タブ１１３Ｋを押さえる部分とを電気的に絶縁するために、図示しない絶縁構造が配置されている。 (Holding part 70)
The pressing portion 70 presses and holds the base end portion 113c of the electrode tab 113 against the die 20 when the tip end portion 113d of the electrode tab 113 is bent by the punch 30, and the electrode tab 113 is processed by the punch 30. It has a function of preventing the position from being displaced due to being dragged in the (first direction D1, second direction D2, and third direction D3). The pressing portion 70 is supported by a fixing portion 71 fixed to the upper holding portion 40 so as to be relatively movable in the first direction D1. A biasing member 72 is arranged between the fixed portion 71 and the pressing portion 70, and biases the pressing portion 70 in the first direction D1. In addition, the pressing portion 70 is provided with an insulating structure (not shown) between a portion that holds the anode side electrode tab 113A and a portion that holds the cathode side electrode tab 113K. The insulating structure electrically insulates between the two portions of the holding portion 70 so that the portion holding the anode side electrode tab 113A and the portion holding the cathode side electrode tab 113K are not electrically connected. The fixing portion 71 and the biasing member 72 are also provided with an insulating structure (not shown) in order to electrically insulate the portion of the holding portion 70 that holds the anode-side electrode tab 113A from the portion that holds the cathode-side electrode tab 113K. ing.
　なお、電極タブ１１３の成形装置１０は、上述した絶縁部材や絶縁構造のほか、アノード側電極タブ１１３Ａやカソード側電極タブ１１３Ｋに接触する設備側部分が全て絶縁構造をとる必要がある。 In addition to the above-described insulating member and insulating structure, the molding apparatus 10 for the electrode tab 113 needs to have an insulating structure for all equipment-side portions that contact the anode-side electrode tab 113A and the cathode-side electrode tab 113K.
　（制御部８０）
　制御部８０は、ＣＰＵやメモリを主体に構成され、駆動部５０、５１等の作動を制御する。 (Control unit 80)
The control unit 80 is mainly composed of a CPU and a memory, and controls the operation of the drive units 50, 51 and the like.
　［電極タブ１１３の成形装置１０における高さ方向の寸法の一例］
　図５Ｄを参照して、電極タブの成形装置における高さ方向の寸法の一例についてさらに説明する。 [Example of Dimensions of Electrode Tab 113 in Height Direction in Molding Device 10]
With reference to FIG. 5D, an example of the dimension in the height direction of the electrode tab forming apparatus will be further described.
　図５Ｄに示される符号は、
　　ｔ１：アノード側電極タブ１１３Ａの厚さ
　　ｔ２：カソード側電極タブ１１３Ｋの厚さ
　　ｘ１：アノード側電極タブ１１３Ａの下面と、カソード側電極タブ１１３Ｋの下面との間の高さ方向の寸法差
　　ｘ２：アノード側電極タブ１１３Ａの厚さ中心Ｏｃと、カソード側電極タブ１１３Ｋの上面との間の高さ方向の寸法差
　　ｙ１：第１ダイ２１の第１支持面２４ａと、第２ダイ２２の第２支持面２４ｂとの間の高さ方向の寸法差
　　ｙ２：第１パンチ３１の押圧面３３ａと、第２パンチ３２の押圧面３３ｂとの間の高さ方向の寸法差
をそれぞれ表している。 The code shown in FIG. 5D is
t1: Thickness of the anode side electrode tab 113A t2: Thickness of the cathode side electrode tab 113K x1: Dimensional difference in the height direction between the lower surface of the anode side electrode tab 113A and the lower surface of the cathode side electrode tab 113K x2: Dimensional difference in the height direction between the thickness center Oc of the anode side electrode tab 113A and the upper surface of the cathode side electrode tab 113K y1: the first supporting surface 24a of the first die 21 and the second supporting surface of the second die 22. Height difference between support surface 24b and height y2: The height difference between the pressing surface 33a of the first punch 31 and the pressing surface 33b of the second punch 32 is shown.
　図５Ｄに示される一例における電池１１０は、電池１１０の厚さ中心Ｏｃ、アノード側電極タブ１１３Ａの厚さ中心Ｏｃ、およびカソード側電極タブ１１３Ｋの厚さ中心Ｏｃの３つがすべて一致している。したがって、ｘ１は、ｘ１＝ｔ１／２－ｔ２／２である。カソード側電極タブ１１３Ｋは、折り返し部１１３ｅを備えており、基端部１１３ｃの下面１１３ｆが第２ダイ２２の第２支持面２４ｂの上に載置される。第１支持面２４ａと第２支持面２４ｂとの間の段差寸法を表しているｙ１をｘ１と同じ寸法とすることによって、アノード側電極タブ１１３Ａが第１支持面２４ａに接触するタイミングと、カソード側電極タブ１１３Ｋが第２支持面２４ｂに接触するタイミングとをほぼ一致させるように設定できる。パンチ３０の押圧面３３ａ、３３ｂの寸法差を表しているｙ２は、ほぼｘ２と同じ寸法に設定するか、あるいは、アノード側電極タブ１１３Ａの曲げ成形が完了してから第２パンチ３２の押圧面３３ｂがカソード側電極タブ１１３Ｋの上面に接触するような寸法に設定する。図示する例においては、ｘ２は、カソード側電極タブ１１３Ｋの厚さの半分（ｔ２／２）である。ｙ２をほぼｘ２と同じ寸法に設定する理由は次のとおりである。アノード側電極タブ１１３Ａの厚さの半分（ｔ１／２）だけ第１パンチ３１がアノード側電極タブ１１３Ａを押し込むと、アノード側電極タブ１１３Ａは、ほぼ直角に折れ曲がり、曲げ成形がほぼ完了する。アノード側電極タブ１１３Ａが第１ダイ２１と第１パンチ３１とによって挟み込まれ、アノード側電極タブ１１３Ａをグリップする力が発生する。アノード側電極タブ１１３Ａをグリップしてからカソード側電極タブ１１３Ｋの曲げ成形を開始するため、アノード側電極タブ１１３Ａの曲げ負荷に影響を受けることなく、カソード側電極タブ１１３Ｋを高精度に曲げ成形できるからである。 In the battery 110 in the example shown in FIG. 5D, the thickness center Oc of the battery 110, the thickness center Oc of the anode-side electrode tab 113A, and the thickness center Oc of the cathode-side electrode tab 113K all match. Therefore, x1 is x1=t1/2-t2/2. The cathode-side electrode tab 113K includes a folded-back portion 113e, and the lower surface 113f of the base end portion 113c is placed on the second support surface 24b of the second die 22. By setting y1 representing the step size between the first support surface 24a and the second support surface 24b to be the same as x1, the timing at which the anode-side electrode tab 113A contacts the first support surface 24a and the cathode The side electrode tab 113K can be set to be substantially coincident with the timing of contact with the second support surface 24b. The y2, which represents the dimensional difference between the pressing surfaces 33a and 33b of the punch 30, is set to be substantially the same as x2, or the pressing surface of the second punch 32 after the bending of the anode-side electrode tab 113A is completed. The size is set so that 33b contacts the upper surface of the cathode-side electrode tab 113K. In the illustrated example, x2 is half the thickness (t2/2) of the cathode-side electrode tab 113K. The reason why y2 is set to be approximately the same as x2 is as follows. When the first punch 31 pushes the anode-side electrode tab 113A by a half of the thickness of the anode-side electrode tab 113A (t1/2), the anode-side electrode tab 113A is bent substantially at a right angle, and the bending is almost completed. The anode side electrode tab 113A is sandwiched by the first die 21 and the first punch 31, and a force for gripping the anode side electrode tab 113A is generated. Since the bending of the cathode electrode tab 113K is started after gripping the anode electrode tab 113A, the cathode electrode tab 113K can be bent with high precision without being affected by the bending load of the anode electrode tab 113A. Because.
　［電極タブ１１３の成形方法］
　次に、図５Ａ～図５Ｃ、図６～図１１を参照して、電極タブ１１３の成形装置１０を用いた電極タブ１１３の成形手順を説明する。図６～図１１は、電極タブ１１３の成形手順を説明するための図であり、各図（Ａ）はカソード側電極タブ１１３Ｋの成形状況を示し、各図（Ｂ）はアノード側電極タブ１１３Ａの成形状況を示している。なお、第１パンチ３１の先端部３０ｄや第２パンチ３２の先端部３０ｄは電池１１０の本体部１１０Ｈ側に撓んで、電極タブ１１３の追い込み曲げ加工が確実にできるように設定されている（図１０（Ａ）（Ｂ）を参照）。ただし、パンチ３０の先端部３０ｄの撓み量は実際にはかなり小さいため、図６～図１１においては、パンチ３０と押さえ部７０との間の隙間がほとんどないように表している。 [Method of forming electrode tab 113]
Next, with reference to FIGS. 5A to 5C and FIGS. 6 to 11, a procedure for forming the electrode tab 113 using the forming device 10 for the electrode tab 113 will be described. 6 to 11 are views for explaining the forming procedure of the electrode tab 113. Each drawing (A) shows the forming state of the cathode side electrode tab 113K, and each drawing (B) shows the anode side electrode tab 113A. The molding situation of is shown. The tip portion 30d of the first punch 31 and the tip portion 30d of the second punch 32 are set so as to bend toward the main body 110H of the battery 110 so that the drive-in bending of the electrode tab 113 can be reliably performed. 10(A)(B)). However, since the bending amount of the tip portion 30d of the punch 30 is actually quite small, FIGS. 6 to 11 show that there is almost no gap between the punch 30 and the pressing portion 70.
　電極タブ１１３の成形装置１０を用いた電極タブ１１３の成形方法は、概説すると、電池１１０の一対の電極タブ１１３のうちの一方の電極タブ１１３（アノード側電極タブ１１３Ａ）の基端部１１３ｃを第１ダイ２１の第１支持面２４ａによって支持し、他方の電極タブ１１３（カソード側電極タブ１１３Ｋ）の基端部１１３ｃを第２ダイ２２の第２支持面２４ｂによって支持する。そして、第１支持面２４ａおよび第２支持面２４ｂに対して直交する第１方向Ｄ１に沿って第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して相対的に移動させて、第１パンチ３１によってアノード側電極タブ１１３Ａを曲げ成形した後に、第２パンチ３２によってカソード側電極タブ１１３Ｋを曲げ成形する。以下、詳述する。 The method of forming the electrode tab 113 using the forming apparatus 10 for the electrode tab 113 will be described in brief. The electrode end 113c of one of the pair of electrode tabs 113 of the battery 110 (anode-side electrode tab 113A) will be described. It is supported by the first supporting surface 24a of the first die 21, and the base end portion 113c of the other electrode tab 113 (cathode side electrode tab 113K) is supported by the second supporting surface 24b of the second die 22. Then, the first punch 31 and the second punch 32 are integrally formed relative to the first die 21 and the second die 22 along a first direction D1 orthogonal to the first support surface 24a and the second support surface 24b. The anode side electrode tab 113A is bent by the first punch 31, and then the cathode side electrode tab 113K is bent by the second punch 32. The details will be described below.
　まず、図５Ａ、図５Ｂ、および図５Ｃを参照して、電池１１０は、電極タブ１１３の成形装置１０に搬入され、図示しない保持装置によって所定の位置に保持される。このとき、電極タブ１１３（アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋ）は、パンチ３０および押さえ部７０と、ダイ２０および曲げ角度調整部６０との間の空間に配置される。 First, referring to FIG. 5A, FIG. 5B, and FIG. 5C, the battery 110 is carried into the molding device 10 for the electrode tab 113, and is held at a predetermined position by a holding device (not shown). At this time, the electrode tabs 113 (the anode-side electrode tabs 113A and the cathode-side electrode tabs 113K) are arranged in the space between the punch 30 and the pressing portion 70, and the die 20 and the bending angle adjusting portion 60.
　図５Ａ、図５Ｂ、および図５Ｃを参照して、制御部８０は、駆動部５０の作動を制御して、上部保持部４０を第１方向Ｄ１（図５Ａ、図５Ｂ、および図５Ｃにおいて下方向）に移動（下降）させる。制御部８０は、駆動部５１の作動を制御して、下部保持部４５を第１方向Ｄ１と反対方向（図５Ａ、図５Ｂ、および図５Ｃにおいて上方向）に移動（上昇）させる。上部保持部４０の移動に伴って、パンチ３０および押さえ部７０が第１方向Ｄ１に移動する。下部保持部４５の移動に伴って、ダイ２０および曲げ角度調整部６０が第１方向Ｄ１と反対方向に移動する。 5A, 5B, and 5C, the control unit 80 controls the operation of the driving unit 50 to move the upper holding unit 40 downward in the first direction D1 (see FIGS. 5A, 5B, and 5C). Direction). The control unit 80 controls the operation of the drive unit 51 to move (raise) the lower holding unit 45 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C). With the movement of the upper holding unit 40, the punch 30 and the pressing unit 70 move in the first direction D1. With the movement of the lower holding portion 45, the die 20 and the bending angle adjusting portion 60 move in the direction opposite to the first direction D1.
　図６（Ａ）および図６（Ｂ）に示すように、第１ダイ２１の第１支持面２４ａがアノード側電極タブ１１３Ａの基端部１１３ｃに当接し、第２ダイ２２の第２支持面２４ｂがカソード側電極タブ１１３Ｋの基端部１１３ｃに当接する。アノード側電極タブ１１３Ａは、先端部１１３ｄが第１支持面２４ａよりも外側に突出するように、第１支持面２４ａの上に配置される。カソード側電極タブ１１３Ｋは、先端部１１３ｄが第２支持面２４ｂよりも外側に突出するように、第２支持面２４ｂの上に配置される。押さえ部７０がアノード側電極タブ１１３Ａの基端部１１３ｃに当接し、カソード側電極タブ１１３Ｋの基端部１１３ｃに当接する。アノード側電極タブ１１３Ａは、基端部１１３ｃが第１支持面２４ａに対して押し付けられて保持される。カソード側電極タブ１１３Ｋは、基端部１１３ｃが第２支持面２４ｂに対して押し付けられて保持される。 As shown in FIGS. 6A and 6B, the first support surface 24a of the first die 21 abuts on the base end portion 113c of the anode-side electrode tab 113A, and the second support surface of the second die 22. 24b contacts the base end part 113c of the cathode side electrode tab 113K. 113 A of anode side electrode tabs are arrange|positioned on the 1st support surface 24a so that 113 d of front-end|tip parts may protrude outside the 1st support surface 24a. The cathode side electrode tab 113K is arranged on the second support surface 24b so that the tip portion 113d projects outward from the second support surface 24b. The pressing portion 70 contacts the base end portion 113c of the anode side electrode tab 113A and the base end portion 113c of the cathode side electrode tab 113K. 113 A of anode side electrode tabs hold|maintain by pressing the base end part 113c with respect to the 1st support surface 24a. The cathode side electrode tab 113K is held by pressing the base end portion 113c against the second support surface 24b.
　なお、押さえ部７０によって電極タブ１１３を押さえる力は、カソード側電極タブ１１３Ｋの場合と、アノード側電極タブ１１３Ａの場合とで異なるように設定してもよい。曲げ剛性が比較的高い電極タブ１１３は、曲げ剛性が比較的低い電極タブ１１３に比べて、パンチ３０によるプレス力に対する抵抗（曲げ負荷）が高いため、押さえ部７０によって押さえる力を高く設定してもよい。電極タブ１１３の曲げ剛性は、材質および板厚によって変わるため適宜設計することが好ましい。 The force of pressing the electrode tab 113 by the pressing portion 70 may be set to be different between the cathode side electrode tab 113K and the anode side electrode tab 113A. Since the electrode tab 113 having a relatively high bending rigidity has a higher resistance (bending load) to the pressing force of the punch 30 than the electrode tab 113 having a relatively low bending rigidity, the pressing force of the pressing portion 70 is set to be high. Good. The flexural rigidity of the electrode tab 113 varies depending on the material and the plate thickness, so it is preferable to design it appropriately.
　次に、制御部８０は、駆動部５０の作動を制御して、上部保持部４０を第１方向Ｄ１にさらに移動させる。これにより、図７（Ｂ）に示すように、制御部８０は、第１パンチ３１の押圧面３３ａをアノード側電極タブ１１３Ａに当接させて曲げ成形を開始する。図５Ｃを参照して、第１パンチ３１の第１方向Ｄ１に沿う長さＬ１は、第２パンチ３２の第１方向Ｄ１に沿う長さＬ２よりも長いため、図７（Ａ）に示す段階では、第２パンチ３２はカソード側電極タブ１１３Ｋに接触していない。 Next, the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1. As a result, as shown in FIG. 7B, the controller 80 brings the pressing surface 33a of the first punch 31 into contact with the anode-side electrode tab 113A and starts bending. Referring to FIG. 5C, since the length L1 of the first punch 31 along the first direction D1 is longer than the length L2 of the second punch 32 along the first direction D1, the step shown in FIG. Then, the second punch 32 is not in contact with the cathode side electrode tab 113K.
　次に、制御部８０は、駆動部５０の作動を制御して、上部保持部４０を第１方向Ｄ１にさらに移動させる。これにより、図８（Ｂ）に示すように、制御部８０は、第１パンチ３１によってアノード側電極タブ１１３Ａを曲げ成形する。制御部８０は、第１ダイ２１の角部２３ａを曲げの起点としてアノード側電極タブ１１３Ａに折れ曲がり部１１３Ｒを形成する。このとき、アノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度をθ１とする。本実施形態では、曲げ角度θ１は、約９０度である。図８（Ａ）に示すように、制御部８０は、第２パンチ３２の押圧面３３ｂをカソード側電極タブ１１３Ｋに当接させて曲げ成形を開始する。カソード側電極タブ１１３Ｋを曲げ成形するとき、先に曲げ成形されたアノード側電極タブ１１３Ａは、第１ダイ２１の角部２３ａと第１パンチ３１とによって挟み込まれてグリップされた状態にある。本実施形態では、アノード側電極タブ１１３Ａの形成材料は例えばアルミニウムであり、カソード側電極タブ１１３Ｋの形成材料は例えば銅である。銅タブ（カソード側電極タブ１１３Ｋ）と比較して柔らかい材質のアルミニウムタブ（アノード側電極タブ１１３Ａ）の成形性を良くするために、アルミニウムタブの折り曲げ角部の裏側を第１ダイ２１の角部２３ａによって受ける（支持する）ことは重要である。さらに、アルミニウムタブの成形がほぼ完了した後に、銅タブを曲げ成形するときにアルミニウムタブをグリップする観点においてもアルミニウムタブ側の第１ダイ２１の角部２３ａは重要な機能を発揮する（後述の図９（Ａ）（Ｂ）を参照）。 Next, the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1. As a result, as shown in FIG. 8B, the controller 80 bends the anode-side electrode tab 113A with the first punch 31. The controller 80 forms the bent portion 113R on the anode-side electrode tab 113A with the corner 23a of the first die 21 as the bending start point. At this time, the bending angle of the bent portion 113R of the anode electrode tab 113A is θ1. In this embodiment, the bending angle θ1 is about 90 degrees. As shown in FIG. 8(A), the control unit 80 brings the pressing surface 33b of the second punch 32 into contact with the cathode-side electrode tab 113K and starts bending. When the cathode-side electrode tab 113K is formed by bending, the anode-side electrode tab 113A formed by bending first is in a state of being sandwiched and gripped by the corner portion 23a of the first die 21 and the first punch 31. In the present embodiment, the material forming the anode-side electrode tab 113A is, for example, aluminum, and the material forming the cathode-side electrode tab 113K is, for example, copper. In order to improve the formability of the aluminum tab (anode side electrode tab 113A) made of a soft material as compared with the copper tab (cathode side electrode tab 113K), the back side of the bent corner of the aluminum tab should be the corner of the first die 21. It is important to receive (support) by 23a. Furthermore, the corner portion 23a of the first die 21 on the aluminum tab side also has an important function from the viewpoint of gripping the aluminum tab when the copper tab is bent and formed after the aluminum tab is almost completely formed (described later). See FIGS. 9A and 9B).
　第１パンチ３１の長さＬ１と第２パンチ３２の長さＬ２との差ΔＬ（図５Ｃを参照）は、アノード側電極タブ１１３Ａの厚さｔ１よりも大きく設定されている。このため、図８（Ｂ）に示すように第１パンチ３１がアノード側電極タブ１１３Ａを曲げ角度θ１に曲げ成形した後に、第２パンチ３２は、カソード側電極タブ１１３Ｋに当接し、カソード側電極タブ１１３Ｋの曲げ成形を開始する。このように、アノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋの曲げ成形を開始するタイミングをずらすことによって、第１パンチ３１および第２パンチ３２は互いの曲げ負荷に影響を受けることなく電極タブ１１３の曲げ成形をすることができる。 The difference ΔL (see FIG. 5C) between the length L1 of the first punch 31 and the length L2 of the second punch 32 is set larger than the thickness t1 of the anode-side electrode tab 113A. Therefore, as shown in FIG. 8B, after the first punch 31 bends and forms the anode side electrode tab 113A to the bending angle θ1, the second punch 32 abuts on the cathode side electrode tab 113K and the cathode side electrode The bending of the tab 113K is started. As described above, by shifting the timing of starting the bending of the anode-side electrode tab 113A and the cathode-side electrode tab 113K, the first punch 31 and the second punch 32 are not affected by their mutual bending loads. Bending can be performed.
　なお、本実施形態では、アノード側電極タブ１１３Ａをカソード側電極タブ１１３Ｋよりも先に曲げ成形するが、これに限定されず、カソード側電極タブ１１３Ｋをアノード側電極タブ１１３Ａよりも先に曲げ成形してもよい。また、電極タブ１１３を曲げ成形する際の第１パンチ３１のプレス力は、第２パンチ３２のプレス力と同じ大きさとしてもよいし、それぞれ異なる大きさとしてもよい。 In the present embodiment, the anode-side electrode tab 113A is bent and formed before the cathode-side electrode tab 113K, but the present invention is not limited to this. The cathode-side electrode tab 113K is bent and formed before the anode-side electrode tab 113A. You may. Further, the pressing force of the first punch 31 when the electrode tab 113 is bent and formed may be the same as the pressing force of the second punch 32, or may be different from each other.
　次に、制御部８０は、駆動部５０の作動を制御して、上部保持部４０を第１方向Ｄ１にさらに移動させる。これにより、図９（Ａ）に示すように、制御部８０は、第２パンチ３２によってカソード側電極タブ１１３Ｋを曲げ成形する。制御部８０は、カソード側電極タブ１１３Ｋに折れ曲がり部１１３Ｒを形成する。このとき、カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度をθ２とする。本実施形態では、曲げ角度θ２は、約９０度である。アノード側電極タブ１１３Ａは、第１ダイ２１の角部２３ａと第１パンチ３１とによってグリップされた状態に維持される。 Next, the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1. As a result, as shown in FIG. 9A, the controller 80 bends the cathode side electrode tab 113K by the second punch 32. The controller 80 forms a bent portion 113R on the cathode side electrode tab 113K. At this time, the bending angle of the bent portion 113R of the cathode-side electrode tab 113K is set to θ2. In this embodiment, the bending angle θ2 is about 90 degrees. The anode-side electrode tab 113A is maintained in a gripped state by the corner 23a of the first die 21 and the first punch 31.
　カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒは、第２ダイ２２の角部２３ｂよりもカソード側電極タブ１１３Ｋの先端側を曲げの起点として折れ曲がるように形成される。これは、カソード側電極タブ１１３Ｋの先端部１１３ｄの一部が折り返し部１１３ｅを備えるためである。折り返し部１１３ｅでは、厚さが先端部１１３ｄの他の部分の２倍になっている。このため、折り返し部１１３ｅの曲げ剛性が先端部１１３ｄの他の部分よりも高くなり、先端部１１３ｄのうち折り返し部１１３ｅと他の部分との境目で曲げ剛性が急激に変化する。そのため、カソード側電極タブ１１３Ｋは、先端部１１３ｄのうち折り返し部１１３ｅと他の部分との境目周辺を起点として折れ曲がるように変形する。 The bent portion 113R of the cathode side electrode tab 113K is formed so as to be bent with the tip side of the cathode side electrode tab 113K as a starting point of bending rather than the corner portion 23b of the second die 22. This is because a part of the tip portion 113d of the cathode-side electrode tab 113K has the folded-back portion 113e. The folded-back portion 113e is twice as thick as the other portion of the tip portion 113d. Therefore, the bending rigidity of the folded-back portion 113e becomes higher than that of the other portion of the tip portion 113d, and the bending rigidity sharply changes at the boundary between the folded-back portion 113e and the other portion of the tip portion 113d. Therefore, the cathode-side electrode tab 113K is deformed so as to be bent starting from the vicinity of the boundary between the folded-back portion 113e and the other portion of the tip portion 113d.
　次に、制御部８０は、駆動部５０の作動を制御して、上部保持部４０を第１方向Ｄ１にさらに移動させる。これにより、図１０（Ａ）および図１０（Ｂ）に示すように、第１パンチ３１および第２パンチ３２は、下死点に達する。第１曲げ角度調整部６１は、第１高さ調整部６４ａによって、第１ダイ２１の第１支持面２４ａに対する第１バックアッププレート６３ａの高さが予め調整されている。第２曲げ角度調整部６２は、第２高さ調整部６４ｂによって、第２ダイ２２の第２支持面２４ｂに対する第２バックアッププレート６３ｂの高さが予め調整されている。 Next, the control unit 80 controls the operation of the drive unit 50 to further move the upper holding unit 40 in the first direction D1. As a result, the first punch 31 and the second punch 32 reach the bottom dead center, as shown in FIGS. 10(A) and 10(B). In the first bending angle adjusting unit 61, the height of the first backup plate 63a with respect to the first supporting surface 24a of the first die 21 is adjusted in advance by the first height adjusting unit 64a. In the second bending angle adjusting section 62, the height of the second backup plate 63b with respect to the second supporting surface 24b of the second die 22 is adjusted in advance by the second height adjusting section 64b.
　図１０（Ｂ）に示すように、第１パンチ３１の摺接面３４ａは、第１バックアッププレート６３ａの傾斜面６５ａと摺接して、傾斜面６５ａに沿って摺動し、第２方向Ｄ２へ移動する。そして、第１パンチ３１の先端部３０ｄは、パンチプレート４１に制限された可動域（隙間Ｇ）の範囲内で第１ダイ２１側に向かう第２方向（図５Ａでは右下方向）へ撓むように変形する。第１パンチ３１の先端部３０ｄによって、アノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度はさらに大きくなるように折れ曲がる方向へ押し込まれて、角度θ１から角度θ３（＞θ１）になる。なお、角度θ３は、スプリングバックを考慮して、最終的なアノード側電極タブ１１３Ａの曲げ角度よりも大きい角度に設定される。 As shown in FIG. 10B, the sliding contact surface 34a of the first punch 31 is in sliding contact with the inclined surface 65a of the first backup plate 63a, slides along the inclined surface 65a, and moves in the second direction D2. Moving. Then, the tip portion 30d of the first punch 31 is bent in the second direction (lower right direction in FIG. 5A) toward the first die 21 side within the range of movement (gap G) limited by the punch plate 41. Deform. By the tip portion 30d of the first punch 31, the bending angle of the bent portion 113R of the anode electrode tab 113A is pushed in the bending direction so as to be further increased, and the angle θ1 changes to the angle θ3 (>θ1). The angle θ3 is set to be larger than the final bending angle of the anode-side electrode tab 113A in consideration of spring back.
　図１０（Ａ）に示すように、第２パンチ３２の摺接面３４ｂは、第２バックアッププレート６３ｂの傾斜面６５ｂと摺接して、傾斜面６５ｂに沿って摺動し、第３方向Ｄ３へ移動する。そして、第２パンチ３２の先端部３０ｄは、パンチプレート４１に制限された可動域（隙間Ｇ）の範囲内で第２ダイ２２側に向かう第３方向（図５Ｂでは右下方向）へ撓むように変形する。第２パンチ３２の先端部３０ｄによって、カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度はさらに大きくなるように折れ曲がる方向へ押し込まれて、角度θ２から角度θ４（＞θ２）になる。角度θ４は、スプリングバックを考慮して、最終的なカソード側電極タブ１１３Ｋの曲げ角度よりも大きい角度に設定される。 As shown in FIG. 10A, the sliding contact surface 34b of the second punch 32 is in sliding contact with the inclined surface 65b of the second backup plate 63b, slides along the inclined surface 65b, and moves in the third direction D3. Moving. Then, the tip portion 30d of the second punch 32 is bent in the third direction (downward right direction in FIG. 5B) toward the second die 22 within the range of movement (gap G) limited by the punch plate 41. Deform. By the tip portion 30d of the second punch 32, the bending portion 113R of the cathode side electrode tab 113K is pushed in the bending direction so as to be further increased, and the angle θ2 is changed to the angle θ4 (>θ2). The angle θ4 is set to be larger than the final bending angle of the cathode-side electrode tab 113K in consideration of springback.
　次に、制御部８０は、駆動部５０の作動を制御して、パンチ３０を第１方向Ｄ１と反対方向（図５Ａ、図５Ｂ、および図５Ｃにおいて上方向）に移動（上昇）させる。これにより、制御部８０は、パンチ３０を電極タブ１１３の加工位置から退避させる。 Next, the control unit 80 controls the operation of the drive unit 50 to move (raise) the punch 30 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C). As a result, the control unit 80 retracts the punch 30 from the processing position of the electrode tab 113.
　図１１（Ｂ）に示すように、アノード側電極タブ１１３Ａは、曲げ角度θ３から最終的に得たい曲げ角度（本実施形態ではθ１）までスプリングバックする。同様に、図１１（Ａ）に示すように、カソード側電極タブ１１３Ｋは、曲げ角度θ４から最終的に得たい曲げ角度（本実施形態ではθ２）までスプリングバックする。 As shown in FIG. 11B, the anode-side electrode tab 113A springs back from the bending angle θ3 to the bending angle (θ1 in this embodiment) that is finally desired. Similarly, as shown in FIG. 11A, the cathode-side electrode tab 113K springs back from the bending angle θ4 to the bending angle (θ2 in this embodiment) that is finally desired.
　次に、制御部８０は、駆動部５０の作動を制御して、パンチ３０および押さえ部７０を第１方向Ｄ１と反対方向（図５Ａ、図５Ｂ、および図５Ｃにおいて上方向）にさらに移動（上昇）させる。また、制御部８０は、駆動部５１の作動を制御して、ダイ２０および曲げ角度調整部６０をパンチ３０に対して離反する方向（図５Ａ、図５Ｂ、および図５Ｃにおいて下方向）に移動（下降）させる。これにより、電極タブ１１３の曲げ成形が完了する。なお、カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒと第２ダイ２２の角部２３ｂとの間には、隙間が存在するため、第２ダイ２２を退避させるときに折り返し部１１３ｅに引っかかることなく円滑に移動させることができる。 Next, the control unit 80 controls the operation of the drive unit 50 to further move the punch 30 and the pressing unit 70 in the direction opposite to the first direction D1 (upward in FIGS. 5A, 5B, and 5C) ( Raise). Further, the control unit 80 controls the operation of the driving unit 51 to move the die 20 and the bending angle adjusting unit 60 in a direction in which they are separated from the punch 30 (downward in FIGS. 5A, 5B, and 5C). (Lower) This completes the bending of the electrode tab 113. In addition, since there is a gap between the bent portion 113R of the cathode side electrode tab 113K and the corner portion 23b of the second die 22, when the second die 22 is retracted, the folded portion 113e is smoothly caught without being caught. Can be moved.
　曲げ成形の加工条件は、加工対象である電極タブ１１３の形状や材料特性によって変わる。そのため、アノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋの材料特性や板厚等の形状が異なる場合、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋを同じパンチを用いて同時に成形した場合、互いの曲げ負荷が影響し、曲げ位置がばらつくおそれがある。また、曲げ成形時にカソード側電極タブ１１３Ｋには折り返し部１１３ｅがあるため、ダイの角部（Ｒ部）とカソード側電極タブ１１３Ｋの成形面との間に隙間が生じ、スプリングバックを考慮した曲げ成形の精度出しが困難という課題がある。要求される曲げ角度に調整するためにはパンチやダイの形状を変更するために再作製する必要がある。 The processing conditions for bending will vary depending on the shape and material characteristics of the electrode tab 113 to be processed. Therefore, when the anode-side electrode tab 113A and the cathode-side electrode tab 113K have different shapes such as material characteristics and plate thickness, and when the anode-side electrode tab 113A and the cathode-side electrode tab 113K are simultaneously formed using the same punch, they are Bending load may affect the bending position. In addition, since the cathode side electrode tab 113K has the folded portion 113e during bending, a gap is created between the corner (R part) of the die and the forming surface of the cathode side electrode tab 113K, and bending is performed in consideration of springback. There is a problem that it is difficult to obtain molding precision. In order to adjust to the required bending angle, it is necessary to remake the punch or die in order to change the shape.
　また、アノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋとは、スプリングバックを考慮した必要な曲げ角度も異なるため、一方の曲げ角度の条件に合わせると、他方にスプリングバックが生じ、所望の角度に曲げ成形できない可能性がある。 Further, since the anode side electrode tab 113A and the cathode side electrode tab 113K also have different required bending angles in consideration of springback, if one bending angle condition is met, springback will occur in the other and the desired angle will be obtained. Bending may not be possible.
　本実施形態の成形装置１０による成形方法では、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋをそれぞれ異なる第１パンチ３１および第２パンチ３２を用いて、曲げ成形するタイミングをずらして成形する。このため、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋを曲げ成形する際の互いの曲げ負荷の影響が生じにくく、また、互いの曲げ角度の条件を個々に最適化することで、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋを所望の形状に曲げることができる。また、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋのそれぞれの曲げ成形の寸法変更を、ダイ２０やパンチ３０の形状をそのままで再作製することなく高精度に曲げ成形できる。また、継続使用による経年摩擦により成形寸法が変化した場合も同様に、ダイ２０やパンチ３０を再作製することなく成形寸法を調整することができる。 In the forming method by the forming apparatus 10 of the present embodiment, the anode side electrode tab 113A and the cathode side electrode tab 113K are formed by using different first punches 31 and second punches 32 with different bending forming timings. Therefore, when the anode-side electrode tab 113A and the cathode-side electrode tab 113K are bent, the influences of the bending loads on each other are unlikely to occur, and the conditions for the bending angles of the anode-side electrode tabs are individually optimized so that the anode-side electrodes The tab 113A and the cathode side electrode tab 113K can be bent into a desired shape. In addition, the dimensional changes of the bending of each of the anode-side electrode tab 113A and the cathode-side electrode tab 113K can be performed with high precision without recreating the shapes of the die 20 and the punch 30 as they are. Also, when the molding size changes due to aged friction due to continuous use, the molding size can be adjusted without remanufacturing the die 20 and the punch 30.
　図３に示したように、電極タブ１１３とバスバー１３２とを溶接する観点から、電極タブ１１３の折り曲げられた先端部１１３ｄの先端面にバスバー１３２を押し付けた際に、電極タブ１１３の先端面が全て平行であり、かつ、同一平面内に揃っていることが重要である。図４に示したように、電池１１０単体でも、アルミニウムタブ（アノード側電極タブ１１３Ａ）の先端部１１３ｄおよび銅タブ（カソード側電極タブ１１３Ｋ）の先端部１１３ｄが９０度に曲がっている状態において、アルミニウムタブの先端面と銅タブの先端面とが平行、かつ、同一平面内に配置されることが重要である。したがって、第１パンチ３１のアルミニウムタブに接触する先端角部（押さえ部７０側の角部）と、第２パンチ３２の銅タブに接触する先端角部（押さえ部７０側の角部）とが互いに平行であり、かつ、両方の角部が、Ｚ方向に沿った同一平面内を移動するようにパンチ３０が配置されている。電極タブ１１３が曲げ成形された直後は、スプリングバックの影響で曲げ角度が９０度に保持されていることはほとんどなく、電極タブ１１３の背面側の角度が９０度よりもやや大きく開くように（表面側の曲げ角度が鈍角となるように）成形されている。背面側の角度が９０度よりも大きいことによって、第１スペーサー１１４の取付が容易になる。１スペーサー１１４とバスバー１３２との間に電極タブ１１３が挟み込まれることによって、電極タブ１１３の折り曲げ部が９０度に保持される。 As shown in FIG. 3, from the viewpoint of welding the electrode tab 113 and the bus bar 132, when the bus bar 132 is pressed against the tip surface of the bent tip portion 113d of the electrode tab 113, the tip surface of the electrode tab 113 is It is important that they are all parallel and are in the same plane. As shown in FIG. 4, even in the battery 110 alone, in a state where the tip 113d of the aluminum tab (anode side electrode tab 113A) and the tip 113d of the copper tab (cathode side electrode tab 113K) are bent at 90 degrees, It is important that the front end surface of the aluminum tab and the front end surface of the copper tab are arranged in parallel and in the same plane. Therefore, a tip corner portion (corner portion on the pressing portion 70 side) of the first punch 31 that contacts the aluminum tab and a tip corner portion (corner portion of the holding portion 70 side) that contacts the copper tab of the second punch 32 are formed. The punch 30 is arranged so as to be parallel to each other and both corners to move in the same plane along the Z direction. Immediately after the electrode tab 113 is bent and formed, the bending angle is hardly maintained at 90 degrees due to the influence of spring back, and the angle on the back side of the electrode tab 113 is opened slightly larger than 90 degrees ( It is formed so that the bending angle on the surface side is obtuse. When the angle on the back side is larger than 90 degrees, the first spacer 114 can be easily attached. By sandwiching the electrode tab 113 between the one spacer 114 and the bus bar 132, the bent portion of the electrode tab 113 is held at 90 degrees.
　上述した実施形態にあっては、銅タブ（カソード側電極タブ１１３Ｋ）の曲げ剛性の方がアルミニウムタブ（アノード側電極タブ１１３Ａ）の曲げ剛性よりも高く、成形時の反力も高い。この場合、曲げ剛性の低いアルミニウムタブを先に成形し、アルミニウムタブが第１パンチ３１と第１ダイ２１の角部２３ａとの間に挟まれてグリップされている状態において、曲げ剛性の高い銅タブを成形することによって、成形反力の高い銅タブ成型時に電池１１０全体の姿勢が乱されることなく成形できる。これによって、銅タブにおける折り曲げ部の先端面と、アルミニウムタブにおける折り曲げ部の先端面とで、９０度折り曲げ姿勢での平行度を確保でき、先端面の垂直方向での位置ずれを抑制できる。なお、前述したように、アルミニウムタブの厚さが例えば０．４ｍｍ、銅タブの厚さが例えば０．２ｍｍであっても、材質自体の特性や、銅タブに関してはコーテーィングされていることもあり、厚さの薄い銅タブのほうが曲げ剛性が高くなっている。 In the embodiment described above, the bending rigidity of the copper tab (cathode side electrode tab 113K) is higher than the bending rigidity of the aluminum tab (anode side electrode tab 113A), and the reaction force during molding is also high. In this case, an aluminum tab having a low bending rigidity is formed first, and the aluminum tab having a high bending rigidity is sandwiched between the first punch 31 and the corner portion 23a of the first die 21 and gripped. By molding the tab, the battery 110 can be molded without disturbing the posture of the entire battery 110 when molding a copper tab having a high molding reaction force. As a result, the parallelism in the 90-degree bending posture can be ensured between the tip surface of the bent portion of the copper tab and the tip surface of the bent portion of the aluminum tab, and positional deviation of the tip surface in the vertical direction can be suppressed. As described above, even if the aluminum tab has a thickness of 0.4 mm and the copper tab has a thickness of 0.2 mm, the characteristics of the material itself and the copper tab may be coated. The thinner the copper tab, the higher the bending rigidity.
　一方の電極タブ１１３（アノード側電極タブ１１３Ａ）の曲げ剛性と他方の電極タブ１１３（カソード側電極タブ１１３Ｋ）の曲げ剛性との差が比較的大きい場合には、上述したように、曲げ剛性の低い一方の電極タブ１１３を先に成形し、次に、先に成形した一方の電極タブ１１３をグリップした状態で、曲げ剛性の高い他方の電極タブ１１３を成形することが好ましい。特に、実施形態の電池１１０のように本体部１１０Ｈの一辺から一対の電極タブ１１３が突出している電池１１０では、先に成形した電極タブ１１３をグリップした状態で、曲げ剛性の高い電極タブ１１３を成形することによって、曲げ剛性の高い電極タブ１１３の曲げ成形時に電池１１０全体の回転が抑制される。その結果、一対の電極タブ１１３の折れ曲がり部１１３Ｒの先端面同士が、折れ曲がり部１１３Ｒの９０度姿勢において精度の高い平行度を確保することができる。 When the difference between the bending rigidity of the one electrode tab 113 (anode side electrode tab 113A) and the bending rigidity of the other electrode tab 113 (cathode side electrode tab 113K) is relatively large, as described above, It is preferable that one of the lower electrode tabs 113 is first molded, and then the other electrode tab 113 having high bending rigidity is molded with the one electrode tab 113 previously molded being gripped. In particular, in the battery 110 in which the pair of electrode tabs 113 protrude from one side of the main body 110H like the battery 110 of the embodiment, the electrode tab 113 having high bending rigidity is attached to the electrode tab 113 formed in advance while being gripped. By molding, rotation of the entire battery 110 is suppressed when the electrode tab 113 having high bending rigidity is bent. As a result, the tip surfaces of the bent portions 113R of the pair of electrode tabs 113 can ensure highly accurate parallelism in the 90-degree posture of the bent portions 113R.
　一方の電極タブを曲げ成形してから電池を移動し、別の工程において他方の電極タブを曲げ成形することも考えられる。しかしながら、この場合には、電池の位置ずれに起因して電極タブ同士の先端面の平行度が悪化するおそれがある。これに対して、上述した実施形態にあっては、第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して移動させている。パンチ３０とダイ２０とを接近させて曲げ成形する１つの工程（１ショット）内において、タイミングをずらして曲げ成形でき、一方の電極タブ（アノード側電極タブ１１３Ａ）を曲げ成形した後に、他方の電極タブ（カソード側電極タブ１１３Ｋ）を曲げ成形している。電池１１０を移動しないことから、電池１１０の位置ずれに起因した電極タブ１１３同士の先端面の平行度の悪化が根本的に生じない。 It is also possible to move the battery after bending one electrode tab and then bend the other electrode tab in another process. However, in this case, the parallelism of the tip surfaces of the electrode tabs may deteriorate due to the displacement of the battery. On the other hand, in the above-described embodiment, the first punch 31 and the second punch 32 are integrally moved with respect to the first die 21 and the second die 22. In one step (one shot) in which the punch 30 and the die 20 are brought close to each other to be bent and formed, the bending can be carried out at different timings, and one electrode tab (anode side electrode tab 113A) can be bent and then the other. The electrode tab (cathode side electrode tab 113K) is formed by bending. Since the battery 110 is not moved, the deterioration of the parallelism between the tip surfaces of the electrode tabs 113 due to the positional displacement of the battery 110 does not fundamentally occur.
　また、第１パンチ３１および第２パンチ３２は、一体となって移動し、第１ダイ２１および第２ダイ２２も、一体となって移動する。これらの構成も、電極タブ１１３を曲げ成形するときの精度を高くするために重要である。 Further, the first punch 31 and the second punch 32 move together, and the first die 21 and the second die 22 also move together. These configurations are also important for increasing the accuracy when bending the electrode tab 113.
　以上説明したように、本実施形態の電極タブ１１３の成形方法は、電池１１０の一対の電極タブ１１３のうちのアノード側電極タブ１１３Ａ（一方の電極タブ）の基端部１１３ｃを第１ダイ２１の第１支持面２４ａによって支持し、カソード側電極タブ１１３Ｋ（他方の電極タブ）の基端部１１３ｃを第２ダイ２２の第２支持面２４ｂによって支持する。そして、第１支持面２４ａおよび第２支持面２４ｂに対して直交する第１方向Ｄ１に沿って第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して相対的に移動させて、第１パンチ３１によって一方の電極タブ１１３Ａを曲げ成形した後に、第２パンチ３２によって他方の電極タブ１１３Ｋを曲げ成形する。 As described above, in the method of molding the electrode tab 113 of the present embodiment, the base end portion 113c of the anode-side electrode tab 113A (one electrode tab) of the pair of electrode tabs 113 of the battery 110 is attached to the first die 21. Of the cathode side electrode tab 113K (the other electrode tab) is supported by the second support surface 24b of the second die 22. Then, the first punch 31 and the second punch 32 are integrally formed relative to the first die 21 and the second die 22 along a first direction D1 orthogonal to the first support surface 24a and the second support surface 24b. The electrode tab 113A is bent by the first punch 31, and then the other electrode tab 113K is bent by the second punch 32.
　上記の成形方法によれば、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋのそれぞれの曲げ成形のタイミングをずらすことができる。これにより、第１パンチ３１および第２パンチ３２は、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの互いの曲げ負荷に影響を受けることなく電極タブ１１３を高精度に曲げ成形できる。さらに、パンチ３０とダイ２０とを接近させて曲げ成形する１つの工程（１ショット）内において、タイミングをずらして曲げ成形でき、電池１１０を移動しないことから、電池１１０の位置ずれに起因した電極タブ１１３同士の先端面の平行度の悪化が根本的に生じない。 According to the above-mentioned forming method, it is possible to shift the respective bending forming timings of the anode side electrode tab 113A and the cathode side electrode tab 113K. As a result, the first punch 31 and the second punch 32 can bend the electrode tab 113 with high precision without being affected by the mutual bending load of the anode side electrode tab 113A and the cathode side electrode tab 113K. Furthermore, in one process (one shot) in which the punch 30 and the die 20 are brought close to each other and bent, the bending can be performed at a different timing, and the battery 110 is not moved. Basically, the deterioration of the parallelism between the tip surfaces of the tabs 113 does not occur.
　また、第１パンチ３１を第１方向Ｄ１に対して交差する第２方向Ｄ２へ変形させることによって、アノード側電極タブ１１３Ａの曲げ角度を調整する。 Also, the bending angle of the anode-side electrode tab 113A is adjusted by deforming the first punch 31 in the second direction D2 that intersects the first direction D1.
　上記の成形方法によれば、アノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度を高い精度で調整できるため、後工程でバスバー１３２に溶接する際の溶接精度を向上させることができる。 According to the above-mentioned molding method, the bending angle of the bent portion 113R of the anode-side electrode tab 113A can be adjusted with high accuracy, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved.
　また、第２パンチ３２を第１方向Ｄ１に対して交差する第３方向Ｄ３へ変形させることによって、カソード側電極タブ１１３Ｋの曲げ角度を調整する。 Further, the bending angle of the cathode side electrode tab 113K is adjusted by deforming the second punch 32 in the third direction D3 intersecting the first direction D1.
　上記の成形方法によれば、カソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度を高い精度で調整できるため、後工程でバスバー１３２に溶接する際の溶接精度を向上させることができる。 According to the above molding method, the bending angle of the bent portion 113R of the cathode-side electrode tab 113K can be adjusted with high accuracy, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved.
　また、先に曲げ成形されたアノード側電極タブ１１３Ａを第１ダイ２１の角部２３ａと第１パンチ３１とによってグリップした状態において、カソード側電極タブ１１３Ｋを曲げ成形する。 Further, the cathode side electrode tab 113K is bent while the previously bent anode side electrode tab 113A is gripped by the corner 23a of the first die 21 and the first punch 31.
　上記の成形方法によれば、第２パンチ３２は、アノード側電極タブ１１３Ａの曲げ負荷に影響を受けることなくカソード側電極タブ１１３Ｋを高精度に曲げ成形できる。 According to the above-mentioned forming method, the second punch 32 can bend the cathode-side electrode tab 113K with high accuracy without being affected by the bending load of the anode-side electrode tab 113A.
　また、一方の電極タブ１１３Ａの曲げ剛性が、他方の電極タブ１１３Ｋの曲げ剛性よりも低い。 Also, the bending rigidity of one electrode tab 113A is lower than the bending rigidity of the other electrode tab 113K.
　上記の成形方法によれば、先に曲げ成形されたアノード側電極タブ１１３Ａをグリップした状態で、曲げ剛性の高いカソード側電極タブ１１３Ｋを成形することによって、曲げ剛性の高いカソード側電極タブ１１３Ｋを高精度に曲げ成形できる。 According to the above-mentioned forming method, the cathode side electrode tab 113K having high bending rigidity is formed by forming the cathode side electrode tab 113K having high bending rigidity while gripping the anode side electrode tab 113A formed by bending in advance. Can be bent with high precision.
　また、本実施形態の電極タブ１１３の成形装置１０は、電池１１０の一対の電極タブ１１３を曲げ成形して折れ曲がり部を形成する成形装置である。この成形装置は、一対の電極タブ１１３のうちのアノード側電極タブ１１３Ａ（一方の電極タブ）の基端部１１３ｃを支持する第１支持面２４ａを備える第１ダイ２１と、カソード側電極タブ１１３Ｋ（他方の電極タブ）の基端部１１３ｃを支持する第２支持面２４ｂを備える第２ダイ２２と、第１ダイ２１と協働して一方の電極タブ１１３Ａを曲げ成形する第１パンチ３１と、第２ダイ２２と協働して他方の電極タブ１１３Ｋを曲げ成形する第２パンチ３２と、第１支持面２４ａおよび第２支持面２４ｂに対して直交する第１方向Ｄ１に沿って第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して相対的に移動させる駆動部５０、５１と、を有する。そして、駆動部５０、５１によって第１パンチ３１および第２パンチ３２を一体として第１ダイ２１および第２ダイ２２に対して相対的に移動させる１つの動作の間に、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの曲げ成形のタイミングをずらしている。 Further, the forming device 10 for the electrode tab 113 of the present embodiment is a forming device for forming a bent portion by bending the pair of electrode tabs 113 of the battery 110. This molding apparatus includes a first die 21 having a first support surface 24a that supports a base end portion 113c of an anode-side electrode tab 113A (one electrode tab) of a pair of electrode tabs 113, and a cathode-side electrode tab 113K. A second die 22 having a second support surface 24b that supports the base end portion 113c of the other electrode tab, and a first punch 31 that cooperates with the first die 21 to bend and form one electrode tab 113A. , A second punch 32 that cooperates with the second die 22 to bend and form the other electrode tab 113K, and a first punch along a first direction D1 orthogonal to the first support surface 24a and the second support surface 24b. The punches 31 and the second punches 32 are integrally provided with driving units 50 and 51 that relatively move the punches 31 and the second punches 32 with respect to the first die 21 and the second die 22. Then, during one operation in which the drive parts 50 and 51 move the first punch 31 and the second punch 32 as a unit relative to the first die 21 and the second die 22, the anode-side electrode tab 113A and The bending timing of the cathode side electrode tab 113K is shifted.
　上記のような構成によれば、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋのそれぞれの曲げ成形のタイミングをずらしているため、第１パンチ３１および第２パンチ３２は、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの互いの曲げ負荷に影響を受けることなく電極タブ１１３を高精度に曲げ成形できる。さらに、パンチ３０とダイ２０とを接近させて曲げ成形する１つの工程（１ショット）内において、タイミングをずらして曲げ成形でき、電池１１０を移動しないことから、電池１１０の位置ずれに起因した電極タブ１１３同士の先端面の平行度の悪化が根本的に生じない。 According to the above configuration, the bending timings of the anode-side electrode tab 113A and the cathode-side electrode tab 113K are shifted, so that the first punch 31 and the second punch 32 are separated from the anode-side electrode tab 113A and the anode-side electrode tab 113A. The electrode tab 113 can be bent and formed with high precision without being affected by the mutual bending load of the cathode side electrode tab 113K. Furthermore, in one process (one shot) in which the punch 30 and the die 20 are brought close to each other and bent, the bending can be performed at a different timing, and the battery 110 is not moved. Basically, the deterioration of the parallelism between the tip surfaces of the tabs 113 does not occur.
　第１パンチ３１の押圧面３３ａとアノード側電極タブ１１３Ａとの間の距離と、第２パンチ３２の押圧面３３ｂとカソード側電極タブ１１３Ｋとの間の距離とを異ならせることによって、タイミングをずらしてなる。 The timing is shifted by making the distance between the pressing surface 33a of the first punch 31 and the anode-side electrode tab 113A different from the distance between the pressing surface 33b of the second punch 32 and the cathode-side electrode tab 113K. It becomes.
　上記のような構成によれば、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋのそれぞれの曲げ成形のタイミングを、所望のタイミングにずらすことができる。 According to the above configuration, the bending timing of each of the anode electrode tab 113A and the cathode electrode tab 113K can be shifted to a desired timing.
　また、第１パンチ３１を第１方向Ｄ１に対して交差する第２方向Ｄ２へ変形させることによって、アノード側電極タブ１１３Ａの曲げ角度を調整する第１曲げ角度調整部６１をさらに有する。 Further, by further deforming the first punch 31 in a second direction D2 intersecting the first direction D1, a first bending angle adjusting section 61 for adjusting the bending angle of the anode electrode tab 113A is further provided.
　上記のような構成によれば、第１曲げ角度調整部６１によってアノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度を高い精度で調整できるため、後工程でバスバー１３２に溶接する際の溶接精度を向上させることができる。また、第１パンチ３１のプレス力は一定とし、第１曲げ角度調整部６１によってアノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度のみを調整することができるため、曲げ角度を調整する際のパラメータを１つに絞ることができる。その結果、アノード側電極タブ１１３Ａの成形のばらつきを抑えて、高精度な成形を安定して実施することができる。また、第１曲げ角度調整部６１によって第１ダイ２１を交換せずに曲げ角度を調整することができる。 According to the above-described configuration, the bending angle of the bent portion 113R of the anode-side electrode tab 113A can be adjusted with high accuracy by the first bending angle adjusting portion 61, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved. Can be improved. In addition, since the pressing force of the first punch 31 is constant and only the bending angle of the bent portion 113R of the anode-side electrode tab 113A can be adjusted by the first bending angle adjusting portion 61, a parameter for adjusting the bending angle. Can be narrowed down to one. As a result, it is possible to suppress variations in the molding of the anode-side electrode tab 113A and stably carry out highly accurate molding. Further, the bending angle can be adjusted by the first bending angle adjusting unit 61 without replacing the first die 21.
　また、第２パンチ３２を第１方向Ｄ１に対して交差する第３方向Ｄ３へ変形させることによって、カソード側電極タブ１１３Ｋの曲げ角度を調整する第２曲げ角度調整部６２をさらに有する。 Further, by further deforming the second punch 32 in the third direction D3 intersecting the first direction D1, there is further provided a second bending angle adjusting section 62 for adjusting the bending angle of the cathode side electrode tab 113K.
　上記のような構成によれば、第２曲げ角度調整部６２によってカソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度を高い精度で調整できるため、後工程でバスバー１３２に溶接する際の溶接精度を向上させることができる。また、第２パンチ３２のプレス力は一定とし、第２曲げ角度調整部６２によってカソード側電極タブ１１３Ｋの折れ曲がり部１１３Ｒの曲げ角度のみを調整することができるため、曲げ角度を調整する際のパラメータを１つに絞ることができる。その結果、カソード側電極タブ１１３Ｋの成形のばらつきを抑えて、高精度な成形を安定して実施することができる。また、第２曲げ角度調整部６２によって第２ダイ２２を交換せずに曲げ角度を調整することができる。 According to the above-described configuration, the bending angle of the bent portion 113R of the cathode-side electrode tab 113K can be adjusted with high accuracy by the second bending angle adjusting portion 62, so that the welding accuracy when welding to the bus bar 132 in a later step can be improved. Can be improved. Further, since the pressing force of the second punch 32 is constant and only the bending angle of the bent portion 113R of the cathode side electrode tab 113K can be adjusted by the second bending angle adjusting portion 62, a parameter for adjusting the bending angle is set. Can be narrowed down to one. As a result, it is possible to suppress variations in the molding of the cathode-side electrode tab 113K and stably carry out highly accurate molding. In addition, the second bending angle adjusting unit 62 can adjust the bending angle without replacing the second die 22.
　本実施形態では、第１パンチ３１の第１方向Ｄ１に沿う長さＬ１と、第２パンチ３２の第１方向Ｄ１に沿う長さＬ２との差ΔＬは、アノード側電極タブ１１３Ａ（一方の電極タブ）の厚さｔ１よりも大きい。これにより、このため、第１パンチ３１がアノード側電極タブ１１３Ａを曲げ角度θ１に曲げ成形した後に、第２パンチ３２は、カソード側電極タブ１１３Ｋに当接し、カソード側電極タブ１１３Ｋの曲げ成形を開始させることができる。したがって、アノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋの曲げ成形を開始するタイミングを確実にずらすことができる。 In the present embodiment, the difference ΔL between the length L1 of the first punch 31 along the first direction D1 and the length L2 of the second punch 32 along the first direction D1 is determined by the anode-side electrode tab 113A (one electrode). It is larger than the thickness t1 of the tab). Therefore, after the first punch 31 bends and forms the anode-side electrode tab 113A at the bending angle θ1, the second punch 32 contacts the cathode-side electrode tab 113K and bends and forms the cathode-side electrode tab 113K. It can be started. Therefore, the timing of starting the bending of the anode-side electrode tab 113A and the cathode-side electrode tab 113K can be reliably shifted.
　第１ダイ２１の角部２３ａの角度αおよび第２ダイ２２の角部２３ｂの角度βは、鋭角である。これにより、曲げ成形するときに曲げ角度を９０度よりも大きくすることができる。その結果、電極タブ１１３を９０度に曲げ成形したい場合に、スプリングバックの影響を考慮して９０度よりも大きな曲げ角度で曲げ成形することができる。 The angle α of the corner portion 23a of the first die 21 and the angle β of the corner portion 23b of the second die 22 are acute angles. As a result, the bending angle can be made larger than 90 degrees during bending. As a result, when the electrode tab 113 is desired to be bent at 90 degrees, it can be bent at a bending angle larger than 90 degrees in consideration of the influence of spring back.
　（変形例１）
　図１２は、変形例１に係る電極タブ１１３の成形装置１０においてアノード側電極タブ１１３Ａ（一方の電極タブ）を曲げ成形する構成を模式的に示す側面図である。 (Modification 1)
FIG. 12 is a side view schematically showing a configuration in which the anode-side electrode tab 113A (one electrode tab) is bent and formed in the forming apparatus 10 for the electrode tab 113 according to the first modification.
　変形例１に係る電極タブ１１３の成形装置１０は、曲げ角度調整部６０の高さ調整部６６の構成を改変した点において上述した実施形態の成形装置１０と相違する。変形例１の成形装置１０における第１曲げ角度調整部６１は、傾斜面６５ａを備える第１バックアッププレート６３ａと、第１ダイ２１の第１支持面２４ａに対する第１バックアッププレート６３ａの高さを調整する高さ調整部６６と、を有する。実施形態においては、第１高さ調整部６４ａおよび第２高さ調整部６４ｂは調整スペーサーが組み込まれている。一方、変形例１の高さ調整部６６は、第１バックアッププレート６３ａを第１パンチ３１に対して接近離反する第１方向Ｄ１または第１方向Ｄ１と反対方向（図１２の上下方向）に移動させて第１バックアッププレート６３ａの高さを調整する駆動機構を有する。駆動機構の構成は特に限定されないが、例えば、ねじ機構（図示省略）を利用することができる。ねじ機構は、例えば、第１バックアッププレート６３ａに形成された雌ねじと、該雌ねじに螺合する雄ねじとを備え、雄ねじを締める方向または緩める方向に回転させることによって第１バックアッププレート６３ａの高さを調整可能とする。高さ調整部６６は、制御部８０に接続される。制御部８０は、曲げ角度調整部６０の高さ調整部６６の作動を制御する。図示省略するが、第２曲げ角度調整部６２も、第２バックアッププレート６３ｂの高さを調整する高さ調整部６６を有する。 The forming apparatus 10 for the electrode tab 113 according to the first modification differs from the forming apparatus 10 of the above-described embodiment in that the configuration of the height adjusting unit 66 of the bending angle adjusting unit 60 is modified. The first bending angle adjusting unit 61 in the molding apparatus 10 of Modification 1 adjusts the height of the first backup plate 63a having the inclined surface 65a and the first backup plate 63a with respect to the first supporting surface 24a of the first die 21. And a height adjusting unit 66 for adjusting the height. In the embodiment, the first height adjusting portion 64a and the second height adjusting portion 64b have adjustment spacers incorporated therein. On the other hand, the height adjusting unit 66 of the first modification moves the first backup plate 63a in the first direction D1 approaching and separating from the first punch 31 or in the direction opposite to the first direction D1 (vertical direction in FIG. 12). A drive mechanism for adjusting the height of the first backup plate 63a is provided. The structure of the drive mechanism is not particularly limited, but for example, a screw mechanism (not shown) can be used. The screw mechanism includes, for example, a female screw formed on the first backup plate 63a and a male screw screwed to the female screw, and the height of the first backup plate 63a is increased by rotating the male screw in a tightening direction or a loosening direction. Adjustable. The height adjusting unit 66 is connected to the control unit 80. The control unit 80 controls the operation of the height adjusting unit 66 of the bending angle adjusting unit 60. Although not shown, the second bending angle adjusting section 62 also has a height adjusting section 66 for adjusting the height of the second backup plate 63b.
　アノード側電極タブ１１３Ａの基端部１１３ｃが第１ダイ２１の第１支持面２４ａと押さえ部７０とによって保持されると、制御部８０は、曲げ角度調整部６０の高さ調整部６６の作動を制御して、図１２の破線部分に示すように、第１バックアッププレート６３ａを第１パンチ３１に対して接近する方向（図１２の上方向）に移動（上昇）させて、第１位置Ｐ１から第２位置Ｐ２に高さを調整する。これにより、第１パンチ３１の摺接面３４ａは、第１バックアッププレート６３ａの傾斜面６５ａと摺接して、傾斜面６５ａに沿って摺動し、第２方向Ｄ２へ移動する。そして、第１パンチ３１の先端部３０ｄは、パンチプレート４１に制限された可動域（隙間Ｇ）の範囲内で第１ダイ２１側に向かう第２方向（図１２では右下方向）へ撓むように変形する。第１パンチ３１の先端部３０ｄによって、アノード側電極タブ１１３Ａの折れ曲がり部１１３Ｒの曲げ角度θａが調整される。 When the base end portion 113c of the anode-side electrode tab 113A is held by the first supporting surface 24a of the first die 21 and the pressing portion 70, the control portion 80 causes the height adjusting portion 66 of the bending angle adjusting portion 60 to operate. 12 is controlled to move (raise) the first backup plate 63a in a direction approaching the first punch 31 (upward direction in FIG. 12) to move to the first position P1. The height is adjusted to the second position P2. As a result, the sliding contact surface 34a of the first punch 31 makes sliding contact with the inclined surface 65a of the first backup plate 63a, slides along the inclined surface 65a, and moves in the second direction D2. Then, the tip portion 30d of the first punch 31 is bent in the second direction (downward right direction in FIG. 12) toward the first die 21 side within the range of movement (gap G) limited by the punch plate 41. Deform. The tip portion 30d of the first punch 31 adjusts the bending angle θa of the bent portion 113R of the anode-side electrode tab 113A.
　図示省略するが、カソード側電極タブ１１３Ｋの基端部１１３ｃが第２ダイ２２の第２支持面２４ｂと押さえ部７０とによって保持されると、高さ調整部６６によって、第２バックアッププレート６３ｂは、第１位置Ｐ１から所定の位置まで第１方向Ｄ１と反対方向に移動される。第２バックアッププレート６３ｂの上昇移動に伴って第２パンチ３２の先端部３０ｄが変形し、カソード側電極タブ１１３Ｋの曲げ角度θｂが調整される。 Although illustration is omitted, when the base end portion 113c of the cathode side electrode tab 113K is held by the second supporting surface 24b of the second die 22 and the holding portion 70, the height adjusting portion 66 causes the second backup plate 63b to move. , From the first position P1 to a predetermined position in the direction opposite to the first direction D1. The tip portion 30d of the second punch 32 is deformed as the second backup plate 63b moves upward, and the bending angle θb of the cathode side electrode tab 113K is adjusted.
　上記のように制御部８０によって作動が制御される高さ調整部６６を備える場合にも、電極タブ１１３の折れ曲がり部１１３Ｒの曲げ角度を高い精度で調整できるため、後工程でバスバー１３２に溶接する際の溶接精度を向上させることができる。また、パンチ３０のプレス力は一定とし、曲げ角度調整部６０によって電極タブ１１３の折れ曲がり部１１３Ｒの曲げ角度のみを調整することができるため、曲げ角度を調整する際のパラメータを１つに絞ることができる。その結果、電極タブ１１３の成形のばらつきを抑えて、高精度な成形を安定して実施することができる。また、曲げ角度調整部６０によってダイ２０を交換せずに曲げ角度を調整することができる。 Even when the height adjusting unit 66 whose operation is controlled by the control unit 80 is provided as described above, since the bending angle of the bent portion 113R of the electrode tab 113 can be adjusted with high accuracy, it is welded to the bus bar 132 in a later step. In this case, welding accuracy can be improved. Further, since the pressing force of the punch 30 is constant and only the bending angle of the bent portion 113R of the electrode tab 113 can be adjusted by the bending angle adjusting unit 60, the parameter for adjusting the bending angle should be reduced to one. You can As a result, it is possible to suppress variation in the molding of the electrode tab 113 and stably carry out highly accurate molding. In addition, the bending angle adjusting unit 60 can adjust the bending angle without replacing the die 20.
　（変形例２）
　図１３は、変形例２に係る電極タブの成形装置の要部を示す正面図である。 (Modification 2)
FIG. 13 is a front view showing a main part of a device for forming an electrode tab according to Modification 2.
　上述した実施形態では、第１パンチ３１の押圧面３３ａとアノード側電極タブ１１３Ａとの間の距離と、第２パンチ３２の押圧面３３ｂとカソード側電極タブ１１３Ｋとの間の距離とを異ならせることによって、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの曲げ成形のタイミングをずらしている。アノード側電極タブ１１３Ａの電池厚さ方向の位置と、カソード側電極タブ１１３Ｋの電池厚さ方向の位置とがほぼ同じであるため、第１パンチ３１の第１方向Ｄ１に沿う長さＬ１と、第２パンチ３２の第１方向Ｄ１に沿う長さＬ２とを異ならせている。本発明はこの場合に限定されるものではなく、アノード側電極タブ１１３Ａとカソード側電極タブ１１３Ｋの曲げ成形のタイミングをずらすことができれば、第１パンチ３１と第２パンチ３２の長さが同じであっても良い。 In the above-described embodiment, the distance between the pressing surface 33a of the first punch 31 and the anode side electrode tab 113A and the distance between the pressing surface 33b of the second punch 32 and the cathode side electrode tab 113K are made different. Thus, the bending timing of the anode side electrode tab 113A and the cathode side electrode tab 113K is shifted. Since the position of the anode side electrode tab 113A in the battery thickness direction and the position of the cathode side electrode tab 113K in the battery thickness direction are substantially the same, the length L1 of the first punch 31 along the first direction D1 is: The length L2 of the second punch 32 along the first direction D1 is different. The present invention is not limited to this case, and if the bending timing of the anode side electrode tab 113A and the cathode side electrode tab 113K can be shifted, the first punch 31 and the second punch 32 have the same length. You can have it.
　図１３に示すように、例えば、セルの製造段階において、アノード側電極タブ１１３Ａの電池厚さ方向の位置と、カソード側電極タブ１１３Ｋの電池厚さ方向の位置とを相対的にずらしておく。電池厚さ方向の位置は、アノード側電極タブ１１３Ａの方がカソード側電極タブ１１３Ｋよりも高い。アノード側電極タブ１１３Ａが第１支持面２４ａに接触するタイミングと、カソード側電極タブ１１３Ｋが第２支持面２４ｂに接触するタイミングとをほぼ一致させるため、高さ方向の位置は、第１支持面２４ａの方が第２支持面２４ｂよりも高い。このような構成の場合にも、第１パンチ３１の押圧面３３ａとアノード側電極タブ１１３Ａとの間の距離Ｌ３と、第２パンチ３２の押圧面３３ｂとカソード側電極タブ１１３Ｋとの間の距離Ｌ４とが異なるため（Ｌ４＞Ｌ３）、第１パンチ３１と第２パンチ３２の長さが同じであっても、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの曲げ成形のタイミングをずらすことができる。 As shown in FIG. 13, for example, in the cell manufacturing stage, the position of the anode side electrode tab 113A in the battery thickness direction and the position of the cathode side electrode tab 113K in the battery thickness direction are relatively displaced. Regarding the position in the battery thickness direction, the anode side electrode tab 113A is higher than the cathode side electrode tab 113K. Since the timing at which the anode-side electrode tab 113A contacts the first support surface 24a and the timing at which the cathode-side electrode tab 113K contact the second support surface 24b are substantially matched, the position in the height direction is the first support surface. 24a is higher than the second support surface 24b. Also in such a configuration, the distance L3 between the pressing surface 33a of the first punch 31 and the anode-side electrode tab 113A, and the distance between the pressing surface 33b of the second punch 32 and the cathode-side electrode tab 113K. Since L4 is different (L4>L3), even if the first punch 31 and the second punch 32 have the same length, it is possible to shift the bending timing of the anode side electrode tab 113A and the cathode side electrode tab 113K. it can.
　（変形例３）
　図１４は、変形例３に係る電極タブの成形装置の要部を示す正面図である。 (Modification 3)
FIG. 14 is a front view showing a main part of an electrode tab forming apparatus according to Modification 3.
　変形例２にあっては、電極タブ１１３の電池厚さ方向の位置を異ならせたが、電極タブ１１３の電池厚さ方向の位置がほぼ同じであっても、第１パンチ３１と第２パンチ３２の長さを同じにすることができる。図１４に示すように、第１パンチ３１の押圧面３３ａと第１ダイ２１の第１支持面２４ａとの間の距離Ｌ５と、第２パンチ３２の押圧面３３ｂと第２ダイ２２の第２支持面２４ｂとの間の距離Ｌ６とを異ならせることによって、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの曲げ成形のタイミングをずらすことができる。図示例にあっては、高さ方向の位置は、第１支持面２４ａの方が第２支持面２４ｂよりも高い（Ｌ６＞Ｌ５）。このような構成の場合には、アノード側電極タブ１１３Ａが第１支持面２４ａに接触して曲げ成形が開始されるタイミングが、カソード側電極タブ１１３Ｋが第２支持面２４ｂに接触して曲げ成形が開始されるタイミングよりも早くなる。このため、第１パンチ３１と第２パンチ３２の長さが同じであっても、アノード側電極タブ１１３Ａおよびカソード側電極タブ１１３Ｋの曲げ成形のタイミングをずらすことができる。 In the second modification, the positions of the electrode tabs 113 in the battery thickness direction are different. However, even if the positions of the electrode tabs 113 in the battery thickness direction are almost the same, the first punch 31 and the second punch 31 may be different. The lengths of 32 can be the same. As shown in FIG. 14, the distance L5 between the pressing surface 33a of the first punch 31 and the first supporting surface 24a of the first die 21, the pressing surface 33b of the second punch 32, and the second surface of the second die 22 are set. By making the distance L6 between the supporting surface 24b and the supporting surface 24b different, the bending timing of the anode-side electrode tab 113A and the cathode-side electrode tab 113K can be shifted. In the illustrated example, the position in the height direction is higher on the first support surface 24a than on the second support surface 24b (L6>L5). In the case of such a configuration, the timing at which the anode side electrode tab 113A contacts the first support surface 24a and the bending is started is the timing when the cathode side electrode tab 113K contacts the second support surface 24b. Will be earlier than the timing when is started. Therefore, even when the first punch 31 and the second punch 32 have the same length, it is possible to shift the bending timing of the anode-side electrode tab 113A and the cathode-side electrode tab 113K.
　本発明は上述した実施形態および変形例１～３に限定されるものではなく、適宜改変することができる。 The present invention is not limited to the above-described embodiment and modification examples 1 to 3, and can be modified as appropriate.
　例えば、一方の電極タブ１１３（アノード側電極タブ１１３Ａ）の曲げ剛性が、他方の電極タブ１１３（カソード側電極タブ１１３Ｋ）の曲げ剛性よりも低い場合に、曲げ剛性の低い一方の電極タブ１１３を先に成形し、次に、先に成形した一方の電極タブ１１３をグリップした状態で、曲げ剛性の高い他方の電極タブ１１３を成形する形態を示したが、この場合に限定されない。一方の電極タブ１１３の曲げ剛性と他方の電極タブ１１３の曲げ剛性との差が比較的小さいような場合には、上記の場合とは逆に、曲げ剛性の高い一方の電極タブ１１３を先に成形し、次に、先に成形した一方の電極タブ１１３をグリップした状態で、曲げ剛性の低い他方の電極タブ１１３を成形してもよい。この場合、一対の電極タブ１１３を同時に曲げ成形する場合に比較して、曲げ剛性の高い電極タブ１１３を曲げ成形するときの反力が、同時に曲げ成形するとときの反力よりも小さいため、曲げ成形時の電池１１０の姿勢の乱れを抑制して曲げ成形できる。 For example, when the bending rigidity of the one electrode tab 113 (anode side electrode tab 113A) is lower than the bending rigidity of the other electrode tab 113 (cathode side electrode tab 113K), one of the electrode tabs 113 having a low bending rigidity is A mode in which the first electrode tab 113 that has been molded first and then the other electrode tab 113 that has high bending rigidity is molded while the one electrode tab 113 that has been previously molded is gripped is shown, but the invention is not limited to this case. When the difference between the bending rigidity of the one electrode tab 113 and the bending rigidity of the other electrode tab 113 is relatively small, the one electrode tab 113 having the higher bending rigidity is reversed first, contrary to the above case. The electrode tab 113 may be molded and then the other electrode tab 113 having a low bending rigidity may be molded while gripping the one electrode tab 113 that is previously molded. In this case, as compared with the case where the pair of electrode tabs 113 are simultaneously bent, the reaction force when the electrode tabs 113 having high bending rigidity are bent is smaller than the reaction force when the electrodes tab 113 is bent at the same time. Bending can be performed while suppressing the orientation of the battery 110 during molding.
　また、上述した実施形態ではアノード側電極タブとカソード側電極タブの形状と材質が異なる例について説明したが、形状または材質のいずれか一方を同じとしてもよいし、形状および材質の両方を同じものとしてもよい。この場合においても、本実施形態の電極タブの成形装置および成形方法を適用することによって、アノード側電極タブおよびカソード側電極タブの互いの曲げ負荷に影響を受けることなく電極タブを高精度に曲げ成形できる。 Further, in the above-described embodiment, an example in which the anode side electrode tab and the cathode side electrode tab have different shapes and materials, but either one of the shapes or materials may be the same, or both shapes and materials may be the same. May be Even in this case, by applying the forming apparatus and the forming method of the electrode tab of the present embodiment, the electrode tab can be bent with high accuracy without being affected by the bending load of the anode side electrode tab and the cathode side electrode tab. Can be molded.
　また、上述した実施形態では曲げ角度調整部は、バックアッププレートの傾斜面をパンチの摺接面に摺動させることによって、パンチを撓むように変形させて電極タブの曲げ角度を調整するとして説明したが、これに限定されない。パンチの先端部に直接的に押圧力や付勢力を付与する押圧部材や付勢部材を設けてもよい。 Further, in the above-described embodiment, the bending angle adjusting unit adjusts the bending angle of the electrode tab by sliding the inclined surface of the backup plate to the sliding contact surface of the punch to deform the punch so as to bend. , But is not limited to this. A pressing member or an urging member that directly applies a pressing force or an urging force may be provided on the tip portion of the punch.
　また、上述した実施形態では保持部を移動させる第１方向は、成形装置の下方向として説明したが、成形装置の構成によって適宜変更してよい。同様に、第２方向や第３方向も適宜変更してよい。 In addition, in the above-described embodiment, the first direction in which the holding unit is moved has been described as the downward direction of the molding device, but it may be appropriately changed depending on the configuration of the molding device. Similarly, the second direction and the third direction may be changed as appropriate.
　また、上述した実施形態では押さえ部はダイの支持面に対して電極タブの基端部を押し付けることによって保持する構成を示したが、保持する機能を有する限りにおいてこれに限定されない。例えば、ダイの支持面に設けた吸着口から真空吸引して電極タブを吸着保持もよいし、磁力あるいは静電気を利用してダイに対して電極タブを保持してもよい。 Further, in the above-described embodiment, the holding portion has been shown as being held by pressing the base end portion of the electrode tab against the supporting surface of the die, but the holding portion is not limited to this as long as it has a holding function. For example, the electrode tab may be sucked and held by suction from a suction port provided on the supporting surface of the die, or the electrode tab may be held to the die by utilizing magnetic force or static electricity.
　また、アノード側電極タブおよびカソード側電極タブのそれぞれを曲げ成形する具体的な手順は、上述した実施形態に限定されるものではなく、適宜改変してよい。 Also, the specific procedure for bending each of the anode-side electrode tab and the cathode-side electrode tab is not limited to the above-described embodiment, and may be modified as appropriate.
　本出願は、２０１９年１月３１日に出願された日本国特許出願第２０１９－１５５１０号に基づいており、その開示内容は、参照により全体として引用されている。 This application is based on Japanese Patent Application No. 2019-15510 filed on January 31, 2019, the disclosure content of which is incorporated by reference in its entirety.
１０　　　　電極タブの成形装置、
２０　　　　ダイ、
２１　　　　第１ダイ、
２２　　　　第２ダイ、
２３ａ　　　角部、
２３ｂ　　　角部、
２４ａ　　　第１支持面、
２４ｂ　　　第２支持面、
３０　　　　パンチ、
３１　　　　第１パンチ、
３２　　　　第２パンチ、
３３ａ　　　押圧面、
３３ｂ　　　押圧面、
３４ａ　　　摺接面、
３４ｂ　　　摺接面、
４０　　　　上部保持部、
４１　　　　パンチプレート、
４２　　　　保持プレート、
４２ａ　　　バッキングプレート、
４２ｂ　　　パンチホルダー、
４５　　　　下部保持部、
４６　　　　絶縁部材、
４７　　　　下部ホルダー、
５０　　　　駆動部、
５１　　　　駆動部、
６０　　　　曲げ角度調整部、
６１　　　　第１曲げ角度調整部、
６２　　　　第２曲げ角度調整部、
６３ａ　　　第１バックアッププレート、
６３ｂ　　　第２バックアッププレート、
６４ａ　　　第１高さ調整部、
６４ｂ　　　第２高さ調整部、
６５ａ　　　傾斜面、
６５ｂ　　　傾斜面、
６６　　　　高さ調整部、
７０　　　　押さえ部、
８０　　　　制御部、
１００　　　電池モジュール、
１１０　　　電池、
１１０Ｈ　　本体部、
１１０Ｓ　　電池スタック、
１１１　　　発電要素、
１１２　　　ラミネートフィルム、
１１３　　　電極タブ、
１１３Ａ　　アノード側電極タブ（一方の電極タブ）、
１１３Ｋ　　カソード側電極タブ（他方の電極タブ）、
１１３Ｒ　　折れ曲がり部、
１１３ｃ　　基端部、
１１３ｄ　　先端部、
１１３ｅ　　折り返し部、
１１４　　　第１スペーサー、
１１５　　　第２スペーサー、
１３２　　　バスバー、
Ｄ１　　　　第１方向、
Ｄ２　　　　第２方向、
Ｄ３　　　　第３方向、
ＬＢ　　　　レーザー光。 10 Electrode tab forming device,
20 dies,
21 First die,
22 Second die,
23a corner,
23b corner,
24a first support surface,
24b second support surface,
30 punches,
31 First punch,
32 Second punch,
33a Pressing surface,
33b Pressing surface,
34a sliding contact surface,
34b sliding contact surface,
40 upper holding part,
41 punch plate,
42 holding plate,
42a backing plate,
42b punch holder,
45 Lower holding part,
46 insulating member,
47 Lower holder,
50 drive,
51 Drive,
60 Bending angle adjustment part,
61 first bending angle adjusting section,
62 second bending angle adjusting section,
63a First backup plate,
63b Second backup plate,
64a 1st height adjustment part,
64b 2nd height adjustment part,
65a inclined surface,
65b inclined surface,
66 Height adjustment unit,
70 Pressing part,
80 control unit,
100 battery module,
110 batteries,
110H main body,
110S battery stack,
111 power generation element,
112 laminated film,
113 electrode tab,
113A Anode side electrode tab (one electrode tab),
113K cathode side electrode tab (other electrode tab),
113R Bent part,
113c base end,
113d tip,
113e folding part,
114 first spacer,
115 second spacer,
132 busbars,
D1 first direction,
D2 second direction,
D3 third direction,
LB laser light.

Claims (11)

  1. 　電池の一対の電極タブのうちの一方の電極タブの基端部を第１ダイの第１支持面によって支持し、他方の電極タブの基端部を第２ダイの第２支持面によって支持し、
    　前記第１支持面および前記第２支持面に対して直交する第１方向に沿って第１パンチおよび第２パンチを一体として前記第１ダイおよび前記第２ダイに対して相対的に移動させて、前記第１パンチによって前記一方の電極タブを曲げ成形した後に、前記第２パンチによって前記他方の電極タブを曲げ成形する、電極タブの成形方法。     The base end of one of the pair of electrode tabs of the battery is supported by the first supporting surface of the first die, and the base end of the other electrode tab is supported by the second supporting surface of the second die. ,
    By moving the first punch and the second punch as one body relative to the first die and the second die along a first direction orthogonal to the first support surface and the second support surface. A method of forming an electrode tab, wherein the one electrode tab is bent and formed by the first punch, and then the other electrode tab is bent and formed by the second punch.
  2. 　前記第１パンチを前記第１方向に対して交差する第２方向へ変形させることによって、前記一方の電極タブの曲げ角度を調整する、請求項１に記載の電極タブの成形方法。 The method for forming an electrode tab according to claim 1, wherein the bending angle of the one electrode tab is adjusted by deforming the first punch in a second direction that intersects the first direction.
  3. 　前記第２パンチを前記第１方向に対して交差する第３方向へ変形させることによって、前記他方の電極タブの曲げ角度を調整する、請求項１または請求項２に記載の電極タブの成形方法。 The method for forming an electrode tab according to claim 1, wherein the bending angle of the other electrode tab is adjusted by deforming the second punch in a third direction intersecting the first direction. ..
  4. 　先に曲げ成形された前記一方の電極タブを前記第１ダイの角部と前記第１パンチとによってグリップした状態において、前記他方の電極タブを曲げ成形する、請求項１～３のいずれか１項に記載の電極タブの成形方法。 4. The other electrode tab is bend-formed in a state in which the one electrode tab previously bend-formed is gripped by the corner portion of the first die and the first punch, and the other electrode tab is bend-formed. Item 7. A method for forming an electrode tab according to item.
  5. 　前記一方の電極タブの曲げ剛性が、前記他方の電極タブの曲げ剛性よりも低い、請求項４に記載の電極タブの成形方法。 The method of forming an electrode tab according to claim 4, wherein the bending rigidity of the one electrode tab is lower than the bending rigidity of the other electrode tab.
  6. 　前記一方の電極タブの曲げ剛性が、前記他方の電極タブの曲げ剛性よりも高い、請求項４に記載の電極タブの成形方法。 The method for forming an electrode tab according to claim 4, wherein the bending rigidity of the one electrode tab is higher than the bending rigidity of the other electrode tab.
  7. 　電池の一対の電極タブを曲げ成形して折れ曲がり部を形成する成形装置であって、
    　前記一対の電極タブのうちの一方の電極タブの基端部を支持する第１支持面を備える第１ダイと、
    　他方の電極タブの基端部を支持する第２支持面を備える第２ダイと、
    　前記第１ダイと協働して前記一方の電極タブを曲げ成形する第１パンチと、
    　前記第２ダイと協働して前記他方の電極タブを曲げ成形する第２パンチと、
    　前記第１支持面および前記第２支持面に対して直交する第１方向に沿って前記第１パンチおよび前記第２パンチを一体として前記第１ダイおよび前記第２ダイに対して相対的に移動させる駆動部と、を有し、
    　前記駆動部によって前記第１パンチおよび前記第２パンチを一体として前記第１ダイおよび前記第２ダイに対して相対的に移動させる１つの動作の間に、前記一方の電極タブおよび前記他方の電極タブの曲げ成形のタイミングをずらしてなる、電極タブの成形装置。     A forming device for forming a bent portion by bending a pair of electrode tabs of a battery,
    A first die having a first support surface that supports a base end portion of one of the pair of electrode tabs;
    A second die having a second support surface for supporting the base end of the other electrode tab;
    A first punch for bending the one electrode tab in cooperation with the first die;
    A second punch for bending the other electrode tab in cooperation with the second die;
    The first punch and the second punch are integrally moved relative to the first die and the second die along a first direction orthogonal to the first support surface and the second support surface. And a drive unit for
    During one operation of moving the first punch and the second punch as a unit relative to the first die and the second die by the drive unit, the one electrode tab and the other electrode An electrode tab forming device in which the tab bending forming timing is shifted.
  8. 　前記第１パンチの押圧面と前記一方の電極タブとの間の距離と、前記第２パンチの押圧面と前記他方の電極タブとの間の距離とを異ならせることによって、前記タイミングをずらしてなる、請求項７に記載の電極タブの成形装置。 The timing is shifted by making the distance between the pressing surface of the first punch and the one electrode tab different from the distance between the pressing surface of the second punch and the other electrode tab. The device for forming an electrode tab according to claim 7, wherein:
  9. 　前記第１パンチの押圧面と前記第１ダイの前記第１支持面との間の距離と、前記第２パンチの押圧面と前記第２ダイの前記第２支持面との間の距離とを異ならせることによって、前記タイミングをずらしてなる、請求項７に記載の電極タブの成形装置。 A distance between the pressing surface of the first punch and the first supporting surface of the first die, and a distance between the pressing surface of the second punch and the second supporting surface of the second die. The device for forming an electrode tab according to claim 7, wherein the timing is shifted by making the timing different.
  10. 　前記第１パンチを前記第１方向に対して交差する第２方向へ変形させることによって、前記一方の電極タブの曲げ角度を調整する第１曲げ角度調整部をさらに有する、請求項７～９のいずれか１項に記載の電極タブの成形装置。 10. The first bending angle adjusting section for adjusting the bending angle of the one electrode tab by deforming the first punch in a second direction intersecting with the first direction, further comprising: The apparatus for forming an electrode tab according to any one of claims 1.
  11. 　前記第２パンチを前記第１方向に対して交差する第３方向へ変形させることによって、前記他方の電極タブの曲げ角度を調整する第２曲げ角度調整部をさらに有する、請求項７～１０のいずれか１項に記載の電極タブの成形装置。 11. The second bending angle adjusting portion for adjusting the bending angle of the other electrode tab by deforming the second punch in a third direction intersecting with the first direction, further comprising: The apparatus for forming an electrode tab according to any one of claims 1.
PCT/JP2020/003765 2019-01-31 2020-01-31 Electrode tab forming method and electrode tab forming device WO2020158935A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004087337A (en) * 2002-08-27 2004-03-18 Nissan Motor Co Ltd Battery laminated aggregate and battery used for it
JP2009187768A (en) * 2008-02-06 2009-08-20 Sony Corp Nonaqueous electrolyte battery and its manufacturing method
JP2017188233A (en) * 2016-04-01 2017-10-12 日産自動車株式会社 Battery pack and manufacturing method of battery pack

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004087337A (en) * 2002-08-27 2004-03-18 Nissan Motor Co Ltd Battery laminated aggregate and battery used for it
JP2009187768A (en) * 2008-02-06 2009-08-20 Sony Corp Nonaqueous electrolyte battery and its manufacturing method
JP2017188233A (en) * 2016-04-01 2017-10-12 日産自動車株式会社 Battery pack and manufacturing method of battery pack

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