WO2016136550A1 - Electrode unit and method for producing electrode unit - Google Patents

Electrode unit and method for producing electrode unit Download PDF

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Publication number
WO2016136550A1
WO2016136550A1 PCT/JP2016/054542 JP2016054542W WO2016136550A1 WO 2016136550 A1 WO2016136550 A1 WO 2016136550A1 JP 2016054542 W JP2016054542 W JP 2016054542W WO 2016136550 A1 WO2016136550 A1 WO 2016136550A1
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WO
WIPO (PCT)
Prior art keywords
separator
electrode plate
electrode
tab
active material
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Application number
PCT/JP2016/054542
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French (fr)
Japanese (ja)
Inventor
貴之 弘瀬
寛恭 西原
Original Assignee
株式会社豊田自動織機
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Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Priority to JP2016550657A priority Critical patent/JP6693419B2/en
Publication of WO2016136550A1 publication Critical patent/WO2016136550A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode unit having an electrode plate, and a method of manufacturing the electrode unit.
  • the electrode unit is used, for example, in a secondary battery.
  • the secondary battery disclosed in Japanese Patent Application Laid-Open No. 2007-27027 has an electrode assembly in which a plurality of positive electrode plates and negative electrode plates are alternately stacked with a thin film separator interposed therebetween.
  • the electrode assembly is manufactured by repeatedly overlapping a separator-wrapped positive electrode plate and a negative electrode plate, which are separately provided in advance.
  • JP 2007-27027 A an electrode assembly is manufactured by repeatedly stacking a positive electrode plate and a negative electrode plate. Therefore, it takes a long time to laminate by the number of electrode plates, which is inefficient.
  • an electrode unit includes a first electrode plate on which a first active material layer is formed, a first separator covering a first surface of the first electrode plate, and a first electrode plate It has the 2nd separator which covers the 2nd side opposite to a side. Furthermore, the electrode unit has a second electrode plate facing the first electrode plate via the first separator or the second separator, and the second electrode plate has a second active material different in polarity from the first electrode plate. A layer is formed.
  • the first electrode plate includes the first separator and the second electrode formed by bonding a first bonding portion formed in a part of the first separator and a second bonding portion formed in a portion of the second separator.
  • the edge part of a 2nd electrode plate is provided with the 2nd active material layer non-formation area
  • the second electrode plate is bonded to either the first bonding portion of the first separator or the second bonding portion of the second separator in the second active material layer non-forming region to form the first separator and the first electrode. It is integrated with the plate and the second separator.
  • the first electrode plate integrally covered with the first separator and the second separator and the second electrode plate are integrated via the first separator or the second separator.
  • the electrode units By stacking the electrode units in order, it is possible to manufacture an electrode assembly in which a plurality of first electrode plates and a plurality of second electrode plates are alternately stacked via a separator.
  • a conventional electrode assembly is manufactured by sequentially laminating the first electrode plate and the second electrode plate wrapped in the separator. Compared to the method, the lamination time of the electrode plate is shortened, and the manufacturing efficiency of the electrode assembly is improved.
  • the second active material layer non-forming region may include a tab portion having a shape protruding from the edge of the second electrode plate.
  • the second electrode plate may be joined to either the first joining portion of the first separator or the second joining portion of the second separator in the tab portion.
  • the electrode unit may have the following configuration instead of the above configuration.
  • the electrode unit includes a first electrode plate on which a first active material layer is formed, a first separator covering a first surface of the first electrode plate, and a second of the first electrode plate opposite to the first surface. It has the 2nd separator which covers a field.
  • the electrode unit has a second electrode plate facing the first electrode plate via the first separator or the second separator, and the second electrode plate has a second active material different in polarity from the first electrode plate.
  • a layer is formed.
  • the first electrode plate is formed by welding the first welded portion formed in a part of the first separator and the second welded portion formed in a part of the second separator.
  • the second electrode plate has a tab portion that protrudes in one direction.
  • the tab portion is a second active material layer non-forming region in which the second active material layer is not formed.
  • the second electrode plate is welded to either the first weld portion of the first separator or the second weld portion of the second separator in the tab portion, and the first separator, the first electrode plate, and the second separator It is considered one.
  • the first electrode plate integrally covered with the first separator and the second separator and the second electrode plate are integrated via the first separator or the second separator.
  • the electrode units By stacking the electrode units in order, it is possible to manufacture an electrode assembly in which a plurality of first electrode plates and a plurality of second electrode plates are alternately stacked via a separator.
  • a conventional electrode assembly is manufactured by sequentially laminating the first electrode plate and the second electrode plate wrapped in the separator. Compared to the method, the lamination time of the electrode plate is shortened, and the manufacturing efficiency of the electrode assembly is improved.
  • each of the first welded portion of the first separator and the second welded portion of the second separator is a portion where the first electrode plate is opposed in a direction parallel to the first surface or the second surface.
  • the welds are located on both the upper and lower sides or both left and right sides of the first electrode plate. Therefore, the movement of the first electrode plate is restricted by the welding portion. The first electrode plate is then positioned between the facing welds.
  • the first electrode plate may have a first tab portion protruding in one direction.
  • the first tab portion is a first active material layer non-forming region in which the first active material layer is not formed.
  • the first tab portion is welded to the first welded portion of the first separator and the second welded portion of the second separator. This prevents the first electrode plate from being displaced relative to the two separators.
  • the second active material layer non-forming region is at least a tab facing edge peripheral portion that is a periphery of the edge opposite to the projecting direction of the tab portion; It can be provided on the part.
  • the periphery of the tab facing edge of the second electrode plate may be welded to either the first weld of the first separator or the second weld of the second separator.
  • the second electrode plate end portions on opposite sides in the surface thereof are welded to the first separator or the second separator.
  • both upper and lower sides or both left and right sides of the second electrode plate are welded to the first separator or the second separator.
  • the first electrode plate may be a positive electrode and the second electrode plate may be a negative electrode. Therefore, by laminating the electrode unit, an electrode assembly in which the positive electrode and the negative electrode are alternately stacked can be formed.
  • Another feature relates to a method of manufacturing an electrode unit.
  • the first surfaces of the plurality of first electrode plates arranged in a line at predetermined intervals are covered with the elongated first separator, and the second surfaces of the plurality of first electrode plates are elongated. Covered with a second separator.
  • the second electrode plate is overlapped from the side of the first separator or the side of the second separator so as to face the first electrode plate via the first separator or the second separator. Welding is performed between the first welding portion of the first separator and the second welding portion of the second separator.
  • the first separator and the second separator are cut between the adjacent first electrode plates.
  • the first separator, the first electrode plate, the second separator, and the second electrode plate are integrated by the first welded portion of the first separator and the second welded portion of the second separator.
  • both separators are welded in the first separator, the first electrode plate, the second separator, and the second electrode plate which are stacked. Thereafter, both separators are cut between the adjacent first electrode plates. Thereby, an electrode unit can be manufactured.
  • the first separator, the first electrode plate, the second separator, and the second electrode plate, which are stacked are made of the first separator from both sides in the stacking direction.
  • the heated melting tool is pressed at the positions of the first welded portion and the second welded portion of the second separator. Thereby, the first welded portion of the first separator and the second welded portion of the second separator are welded. Then, the first separator, the first electrode plate, the second separator, and the second electrode plate are integrated.
  • the first separator, the first electrode plate, the second separator, and the second electrode plate are integrated only by welding the welded portions of the first separator and the second separator. Therefore, the manufacturing efficiency of the electrode unit is improved.
  • FIG. 10 is a cross-sectional view in the direction of arrows XI-XI in FIG. 9; It is a front view of the electrode unit concerning other embodiments. It is a front view of the electrode unit concerning other embodiments.
  • an electrode assembly 20 and an electrolyte (not shown) are accommodated in the storage device 10 which is a lithium ion secondary battery.
  • Power storage device 10 supplies power to the outside at the time of discharge through two external connection terminals 14 and 16 penetrating the upper surface of case 12 and is supplied from the outside at the time of charge.
  • the electrode assembly 20 is configured by laminating a plurality of electrode units 30, as shown in FIG.
  • the electrode unit 30 includes a positive electrode plate 40 which is a first electrode plate, a first separator 50 which covers the entire area of the first surface (the back surface side in FIG. 3) of the positive electrode plate 40; A second separator 60 which covers the entire area of the second surface opposite to the first surface of the plate 40, and a negative electrode which is a second electrode plate facing the entire second surface of the positive electrode plate 40 with the second separator 60 in between. And a plate 70.
  • a portion of the negative electrode plate 70 excluding the leading end portion of the negative electrode plate tab portion 70T described later is located within the range of both the separators 50 and 60.
  • the negative electrode plate 70 be disposed on either side of the electrode assembly 20 in the stacking direction of the electrode unit 30.
  • the positive electrode plate 40 is disposed at the end of the stacked electrode unit 30 group with the first separator 50 interposed therebetween. Ru. Therefore, it is preferable to add one negative electrode plate 70 to the end of the stacked electrode unit 30 group.
  • the positive electrode plate 40 has a substantially rectangular current collector 42 as shown in FIGS.
  • the current collector 42 is a metal foil such as an aluminum foil, for example.
  • a positive electrode active material layer 44 which is a first active material layer is formed on substantially the entire area of both surfaces of the current collector 42.
  • the positive electrode active material layer 44 is formed, for example, by applying a positive electrode active material such as a lithium-containing metal oxide to the current collector 42.
  • the positive electrode plate 40 has a substantially rectangular positive electrode plate tab portion (first tab portion) 40T which protrudes from a positive electrode plate tab side 40a which is one side of a substantially rectangular shape.
  • the positive electrode plate tab portion 40T extends beyond the upper edges of both the separators 50, 60 as shown in FIGS.
  • Both surfaces of the positive electrode plate tab portion 40T are a positive electrode active material layer non-forming region (first active material layer non-forming region) 40N in which the positive electrode active material layer 44 is not formed. As shown in FIG. 1, the positive electrode plate tab portions 40T of the respective positive electrode plates 40 are combined into one and connected to one external connection terminal 14.
  • the negative electrode plate 70 has a current collector 72.
  • the current collector 72 is configured in a substantially rectangular shape that is slightly larger than the current collector 42 of the positive electrode plate 40.
  • the current collector 72 is a metal foil such as copper foil, for example.
  • a negative electrode active material layer 74 which is a second active material layer is formed on the entire area of both surfaces of the current collector 72.
  • the negative electrode active material layer 74 is formed, for example, by applying a negative electrode active material such as carbon to the current collector 72.
  • the negative electrode plate 70 has a substantially rectangular negative electrode plate tab portion (tab portion) 70T which protrudes from the negative electrode plate tab side 70a which is one side of a substantially rectangular shape.
  • the negative electrode tab portion 70T extends beyond the upper edges of the separators 50 and 60 as shown in FIGS.
  • a negative electrode active material layer non-forming region (second active material layer non-forming region) 70N in which the negative electrode active material layer 74 is not formed is both surfaces of the negative electrode plate tab portion 70T.
  • the negative electrode tab portions 70T of the respective negative electrode plates 70 are combined into one and connected to one external connection terminal 16.
  • the first separator 50 and the second separator 60 are, for example, thin films made of an insulating resin material as shown in FIGS. Both of the separators 50 and 60 are formed in a substantially rectangular shape which is one size larger than the current collector 72 of the negative electrode plate 70.
  • the positive electrode plate 40, the negative electrode plate 70, the first separator 50, and the second separator 60 are joined and integrated in two joining regions (F 1 and F 2).
  • the bonding regions (F1, F2) are welding regions formed by, for example, melting a part of the first separator 50 and the second separator 60 with a laser or the like.
  • the tab side welding area (bonding area) F1 which is one of the bonding areas is continuous from the outside of the negative electrode tab side 70a along the entire length of the negative electrode tab side 70a in the front view shown in FIG. It extends to a position beyond both ends of the tab edge 70a.
  • the tab-facing side welding area (joining area) F2 which is the other joining area, is continuous with the outside of the negative-plate tab opposing side 70b along the entire length of the negative-plate tab opposing side 70b in the front view shown in FIG. , And extends to a position beyond both ends of the negative electrode plate tab opposing side 70b.
  • the negative electrode tab side 70a is one side of the negative electrode plate 70 on which the negative electrode tab portion 70T is formed.
  • the negative electrode plate tab opposing side 70 b is another side of the negative electrode plate 70 opposite to the negative electrode plate tab side 70 a.
  • the tab side welding area F1 includes a first tab side joint (first joint or first weld) 50a and a second tab side joint (second joint or second weld) 60a.
  • the first tab side joint portion 50a and the second tab side joint portion 60a are formed, for example, by melting the first separator 50 and the second separator 60 with a laser.
  • the first tab side joint portion 50a and the second tab side joint portion 60a are continuously formed across the entire tab side welding area F1 (see FIG. 2).
  • both tab edge joint portions 50a and 60a are intermittently provided in the tab edge welding area F1 (see FIG. 2).
  • FIG. 1 As shown in FIG.
  • the first tab side joint portion 50a and the second tab side joint portion 60a are joined, for example, welded to the positive plate tab portion 40T at a position corresponding to the positive plate tab portion 40T.
  • the second tab side joint portion 60a is joined, for example, welded to the negative electrode tab portion 70T at a position corresponding to the negative electrode tab portion 70T.
  • the welding (joining) point Y is shown by a thick solid line.
  • the tab opposing side welding area F2 has a first tab opposing side joint (first joint or first welding) 50b and a second tab opposing side joint (second joint or second welding). Part) 60b.
  • the first tab facing side joint portion 50b and the second tab facing side joint portion 60b are formed, for example, by melting a part of the first separator 50 and the second separator 60 with a laser.
  • the first tab facing side joint portion 50b and the second tab facing side joint portion 60b are continuously formed across the entire tab facing side welding area F2 (see FIG. 2).
  • both tab facing side joint portions 50b and 60b are formed intermittently in the tab facing side welding area F2.
  • the tab side joint portions 50a and 60a are joined to each other by welding or the like in the tab side welding area F1.
  • the two tab opposing side joint portions 50b and 60b are joined to each other by welding or the like in the tab opposing side welding region F2.
  • the tab side welding area F1 is positioned along the positive electrode plate tab side 40a
  • the tab opposing side welding area F2 is positioned along the positive electrode plate tab opposing side 40b.
  • the two separators 50 and 60 are welded to each other at two opposing positions located on both sides of the positive electrode plate 40. Therefore, the positive electrode plate 40 is encased in both separators 50 and 60, and is integrated with both separators 50 and 60.
  • the negative electrode tab portion 70T is welded to the second tab side joint portion 60a. Therefore, the negative electrode plate 70 is integrated with the positive electrode plate 40 and the first separator 50 by the second separator 60.
  • the positive electrode plate tab side 40a is one side of the positive electrode plate 40 on which the positive electrode plate tab portion 40T is formed.
  • the positive electrode plate tab opposing side 40 b is another side of the positive electrode plate 40 opposite to the positive electrode plate tab side 40 a.
  • the positive electrode plate 40 is directed in the vertical direction in FIGS. 2 and 4 by two joint portions facing each other with the positive electrode plate 40 in between, that is, both tab side joint portions 50a and 60a and both tab opposite side joint portions 50b and 60b. Movement is regulated. Thereby, the positive electrode plate 40 is positioned between the both tab side joint portions 50a, 60a and the both tab opposing side joint portions 50b, 60b. By welding the positive electrode plate tab portion 40T to the both tab side joint portions 50a and 60a, displacement of the positive electrode plate 40 with respect to both the separators 50 and 60 is prevented.
  • the positive electrode plate tab portion 40T may be welded to only one of the both tab side joint portions 50a and 60a.
  • the electrode unit 30 is manufactured in each process shown in FIG. First, in the wrapping step S1, the positive electrode plate 40 transported in a line at a predetermined interval is covered with separators from both upper and lower sides. A first surface of the positive electrode plate 40 is covered by a long first separator 50, and a second surface is covered by a long second separator 60. Each of the first separator 50 and the second separator 60 is unwound from the corresponding roll body 302 and pressed against the positive electrode plate 40 by the two opposing pressing rolls 304.
  • the negative electrode plate 70 is stacked from the side of the second separator 60 on the positive electrode plate 40 sandwiched between the separators 50 and 60.
  • the negative electrode plate 70 is superimposed on the second separator 60 such that the negative electrode plate 70 faces the entire second surface of the positive electrode plate 40 with the second separator therebetween.
  • both the melting tools 306 have a cylindrical main portion 306a, and have disk portions 306b larger in diameter than the main portion 306a at both axial ends of the main portion 306a.
  • the tab side welding area F1 and the tab opposing side welding area F2 are respectively melted.
  • both tab side joint portions 50a and 60a shown in FIG. 4 are melted, and both tab side joint portions 50a and 60a and the positive electrode plate tab portion 40T are welded, and a second tab side joint portion 60a and the negative electrode tab portion 70T are welded.
  • both tab facing side joint portions 50b and 60b shown in FIG. 4 are welded.
  • the disc portions 306 b of the two melting tools 306 are continuously pressed against each other while rotating while being superimposed on the stacked first separator 50, positive electrode plate 40, second separator 60, and negative electrode plate 70.
  • the tab side welding area F1 and the tab opposing side welding area F2 are continuously formed.
  • a cutting step S4 is performed.
  • the first separator 50 and the second separator 60 are cut, for example, by a cutter (not shown) between the adjacent negative electrode plates 70.
  • the electrode unit 30 in which the first separator 50, the positive electrode plate 40, the second separator 60, and the negative electrode plate 70 are integrated is completed.
  • the laminating apparatus 320 has a laminating box 324 for laminating the electrode unit 30, and a slide surface 322 located above the laminating box 324 for dropping the electrode unit 30 into the laminating box 324.
  • the stacked box 324 is in the form of a rectangular parallelepiped opened upward, and the bottom surface 324 a is arranged to be inclined at a predetermined angle V with respect to the horizontal surface W.
  • the electrode units 30 dropped into the stack box 324 from the slide surface 322 are stacked in order on the side surface of the stack box 324 located on the lower side.
  • Each electrode unit 30 is dropped into the stacking box 324 in a standing state in which both tab portions 40T and 70T face upward, and is stacked in the standing state.
  • the positive electrode plate 40 and the negative electrode plate 70 integrally covered with the first separator 50 and the second separator 60 are integrated with the second separator 60 in between. Therefore, when the electrode units 30 are sequentially stacked in the stacking box 324, an electrode assembly 20 in which a plurality of positive electrode plates 40 and a plurality of negative electrode plates 70 are alternately stacked with a separator interposed therebetween is manufactured. According to the method of manufacturing the electrode assembly 20 by sequentially stacking the electrode units 30 in this manner, compared to the conventional method of manufacturing the electrode assembly by sequentially laminating the positive electrode plate and the negative electrode plate wrapped by the separator Thus, the lamination time of the electrode plate is shortened, and the manufacturing efficiency of the electrode assembly is improved.
  • the negative electrode plate 70 be disposed at each end of the electrode assembly 20 in the stacking direction of the electrode unit 30.
  • the positive electrode plate 40 is interposed with the first separator 50 at the end of the stacked electrode unit 30 group. Will be placed. Therefore, it is preferable that one negative electrode plate 70 be additionally disposed at the end of the stacked electrode unit 30 group.
  • the tab side welding area F1 and the tab opposing side welding area F2 with respect to the stacked first separator 50, the positive electrode plate 40, the second separator 60, and the negative electrode plate 70. Weld the position of. The first separator 50, the positive electrode plate 40, the second separator 60, and the second negative electrode plate 70 are integrated by only this welding step. Thereby, the manufacturing efficiency of the electrode unit 30 is good.
  • the negative electrode plate 70 may be superimposed from the side of the first separator 50.
  • the negative electrode plate 70 is disposed to face the entire first surface of the positive electrode plate 40 with the first separator 50 therebetween.
  • the first tab side joint portion 50a and the negative electrode plate tab portion 70T are welded in the tab side welding area F1.
  • the negative electrode plate 70 may be wrapped by the first separator 50 and the second separator 60, and the positive electrode plate 40 may be stacked on the first separator 50 or the second separator 60.
  • the tab side welding area F1 includes a portion where both tab side joint portions 50a and 60a are welded, a portion where both tab side joint portions 50a and 60a and the negative electrode tab portion 70T are welded, and a positive electrode plate A tab edge welding portion of the separator facing the tab portion 40T and a portion to which the positive electrode plate tab portion 40T is welded are provided.
  • electrode units 30 a to 30 c shown in FIGS. 6 to 8 may be employed.
  • the electrode unit 30a shown in FIG. 6 has a tab side welding area F3 formed only on the periphery of the negative electrode tab portion 70T instead of the tab side welding area F1 shown in FIG.
  • the electrode unit 30b shown in FIG. 7 has a tab side welding area F3 formed only on the periphery of the negative electrode tab portion 70T instead of the tab side welding area F1 shown in FIG. There is no area F2.
  • the electrode unit 30c shown in FIG. 8 has the tab side welding area F1, it does not have the tab facing side welding area F2 shown in FIG.
  • FIGS. 6 to 8 and FIGS. 9 to 13 described below the same reference numerals are given to portions having the same or equivalent configurations and functions as those of FIGS.
  • an electrode unit 30d shown in FIGS. 9 to 11 may be employed.
  • the negative electrode active material layer non-forming region 70N is formed on both sides of the peripheral portion (tab peripheral edge peripheral portion) 76 which is a periphery of the negative electrode plate tab opposing side 70b in the negative electrode plate 70.
  • the negative electrode active material layer non-forming region 70N of the peripheral portion 76 has a predetermined width H from the negative electrode plate tab opposing side 70b, and is continuous along the negative electrode plate tab opposing side 70b.
  • the negative electrode tab opposite side 70b is located on the opposite side of the edge having the negative electrode tab portion 70T, as is clear from FIGS.
  • the tab facing side welding area F4 of the electrode unit 30d is provided at a position corresponding to the negative electrode active material layer non-forming area 70N of the peripheral portion 76.
  • the tab facing side welding area F4 is continuous along the entire length of both tab facing sides 40b and 70b between the positive plate tab facing side 40b and the negative plate tab facing side 70b, as shown in FIG. It extends beyond the both ends of the negative electrode tab opposite side 70b.
  • both tab facing side joint portions 50c and 60c are welded to each other. Further, in the tab facing side welding area F4, the second tab facing side joint portion 60c is welded to the negative electrode active material layer non-forming area 70N of the peripheral portion 76.
  • the tab side welding area F1 is located in the vicinity of the negative electrode tab side 70a of the negative electrode plate 70, and the negative electrode tab portion 70T is welded to the second separator 60 in the tab side welding area F1.
  • a peripheral portion 76 is provided in the vicinity of the negative electrode plate tab opposing side 70 b facing the negative electrode plate tab side 70 a, and the peripheral portion 76 is welded to the second separator 60. Therefore, both ends of the negative electrode plate 70 are welded to the second separator 60. As a result, the negative electrode plate 70 is difficult to move relative to the second separator 60, and the state in which the negative electrode plate 70 faces the positive electrode plate 40 is always maintained.
  • the tab facing side welding area F4 may be formed along the entire length in the longitudinal direction of the negative electrode plate 70 or the entire length in the longitudinal direction of the separators 50, 60, or may be formed intermittently along the edge of the negative electrode plate 70.
  • the mutual welding of both tab facing side joints 50c, 60c may be intermittent along the edge of the separators 50, 60.
  • the welding between the second tab facing side joint portion 60c and the negative electrode active material layer non-forming region 70N of the peripheral portion 76 may be intermittently formed along the edge of the negative electrode plate 70.
  • the electrode unit 30e has a tab side welding area F3 formed only around the negative electrode plate tab portion 70T, and a tab opposing side welding area F4 for welding the negative electrode plate 70 and the second separator 60. It may be As shown in FIG. 13, the electrode unit 30f may not have the tab side welding area F1 shown in FIG. 9 etc., and may have the tab facing side welding area F4. In FIGS. 12 and 13, parts having the same or equivalent configurations and functions as those in FIGS.
  • the second electrode plate is joined to either the first joining portion of the first separator or the second joining portion of the second separator in the region where the second active material layer is not formed.
  • the negative electrode plate 70 of FIG. 4 is welded to the second tab side joint portion 60a of the second separator 60 in the negative electrode active material layer non-forming region 70N.
  • the negative electrode plate 70 of FIG. 13 is welded to a part of the second separator 60 in the negative electrode active material layer non-forming region 70N.
  • the second electrode plate may be bonded by an adhesive to the first bonding portion or the second bonding portion, and may be bonded by a bonding double-sided tape.

Abstract

This electrode unit (30) comprises: a first electrode plate (40) that is provided with a first active material layer; a first separator (50) that covers a first surface of the first electrode plate (40); and a second separator (60) that covers a second surface of the first electrode plate (40). This electrode unit (30) additionally comprises a second electrode plate (70) that is provided with a second active material layer which has a polarity different from that of the first electrode plate (40). The first electrode plate (40) is enclosed by the first separator (50) and the second separator (60) by having first bonding parts (50a, 50b) of the first separator (50) and second bonding parts (60a, 60b) of the second separator (60) bonded with each other. A peripheral part of the second electrode plate (70) is provided with a second active material layer-free region (70N), in which the second active material layer is not formed. The second active material layer-free region (70N) is bonded with the first bonding parts (50a, 50b) or the second bonding parts (60a, 60b).

Description

電極ユニット、及び電極ユニットの製造方法Electrode unit and method of manufacturing electrode unit
　本発明は、電極板を有する電極ユニット、及び当該電極ユニットの製造方法に関する。電極ユニットは、例えば２次電池に使用される。 The present invention relates to an electrode unit having an electrode plate, and a method of manufacturing the electrode unit. The electrode unit is used, for example, in a secondary battery.
　特開２００７－２７０２７号公報に開示された２次電池は、複数の正極板と負極板とが薄膜状のセパレータを挟んで交互に積層された電極組立体を有する。この電極組立体は、予め別体として設けられた、セパレータで包まれた正極板と、負極板とを繰り返し重ね合わせて製造されている。 The secondary battery disclosed in Japanese Patent Application Laid-Open No. 2007-27027 has an electrode assembly in which a plurality of positive electrode plates and negative electrode plates are alternately stacked with a thin film separator interposed therebetween. The electrode assembly is manufactured by repeatedly overlapping a separator-wrapped positive electrode plate and a negative electrode plate, which are separately provided in advance.
　特開２００７－２７０２７号公報では、正極板と、負極板とを繰り返し重ね合わせて電極組立体を製造する。そのため電極板の枚数分だけ積層に時間がかかり、効率が悪い。 In JP 2007-27027 A, an electrode assembly is manufactured by repeatedly stacking a positive electrode plate and a negative electrode plate. Therefore, it takes a long time to laminate by the number of electrode plates, which is inefficient.
　電極板の積層時間が短く、これにより電極組立体の製造効率の高い電極ユニットが従来必要とされている。 There has been a need in the past for an electrode unit having a short lamination time of the electrode plate, whereby the production efficiency of the electrode assembly is high.
　本発明の１つの特徴によると、電極ユニットは、第１活物質層が形成された第１電極板と、第１電極板の第１面を覆う第１セパレータと、第１電極板の第１面とは反対側の第２面を覆う第２セパレータを有する。さらに電極ユニットは、第１セパレータもしくは第２セパレータを介して第１電極板と対向する第２電極板を有し、第２電極板には、第１電極板とは極性の異なる第２活物質層が形成されている。第１電極板は、第１セパレータの一部に形成された第１接合部と、第２セパレータの一部に形成された第２接合部と、が接合されることで第１セパレータと第２セパレータとに包まれて第１セパレータ及び第２セパレータと一体とされている。第２電極板の縁部には、第２活物質層が形成されていない第２活物質層非形成領域が設けられる。第２電極板は、第２活物質層非形成領域において、第１セパレータの第１接合部もしくは第２セパレータの第２接合部、のいずれか一方と接合されて、第１セパレータと第１電極板と第２セパレータと一体とされている。 According to one aspect of the present invention, an electrode unit includes a first electrode plate on which a first active material layer is formed, a first separator covering a first surface of the first electrode plate, and a first electrode plate It has the 2nd separator which covers the 2nd side opposite to a side. Furthermore, the electrode unit has a second electrode plate facing the first electrode plate via the first separator or the second separator, and the second electrode plate has a second active material different in polarity from the first electrode plate. A layer is formed. The first electrode plate includes the first separator and the second electrode formed by bonding a first bonding portion formed in a part of the first separator and a second bonding portion formed in a portion of the second separator. It is wrapped in a separator and made integral with the first separator and the second separator. The edge part of a 2nd electrode plate is provided with the 2nd active material layer non-formation area | region in which the 2nd active material layer is not formed. The second electrode plate is bonded to either the first bonding portion of the first separator or the second bonding portion of the second separator in the second active material layer non-forming region to form the first separator and the first electrode. It is integrated with the plate and the second separator.
　したがって第１セパレータと第２セパレータとに一体に包まれた第１電極板と、第２電極板とが第１セパレータもしくは第２セパレータを介して一体となっている。この電極ユニットを順に積層することで、複数の第１電極板と複数の第２電極板とがセパレータを介して交互に積層された電極組立体を製造することができる。このようにして電極ユニットを順に積層して電極組立体を製造する方法によると、セパレータに包まれた第１電極板と、第２電極板とを順に積層して電極組立体を製造する従来の方法に比べて、電極板の積層時間が短縮され、電極組立体の製造効率が向上する。 Therefore, the first electrode plate integrally covered with the first separator and the second separator and the second electrode plate are integrated via the first separator or the second separator. By stacking the electrode units in order, it is possible to manufacture an electrode assembly in which a plurality of first electrode plates and a plurality of second electrode plates are alternately stacked via a separator. According to the method of manufacturing the electrode assembly by sequentially laminating the electrode units in this manner, a conventional electrode assembly is manufactured by sequentially laminating the first electrode plate and the second electrode plate wrapped in the separator. Compared to the method, the lamination time of the electrode plate is shortened, and the manufacturing efficiency of the electrode assembly is improved.
　他の特徴によると、第２活物質層非形成領域は、第２電極板の縁部から突出した形状のタブ部を含み得る。第２電極板は、タブ部において、第１セパレータの第１接合部、もしくは第２セパレータの第２接合部、のいずれか一方と接合され得る。 According to another feature, the second active material layer non-forming region may include a tab portion having a shape protruding from the edge of the second electrode plate. The second electrode plate may be joined to either the first joining portion of the first separator or the second joining portion of the second separator in the tab portion.
　他の特徴によると、電極ユニットは、上述の構成に代えて以下の構成であっても良い。例えば電極ユニットは、第１活物質層が形成された第１電極板と、第１電極板の第１面を覆う第１セパレータと、第１電極板の第１面とは反対側の第２面を覆う第２セパレータを有する。さらに電極ユニットは、第１セパレータもしくは第２セパレータを介して第１電極板と対向する第２電極板を有し、第２電極板には、第１電極板とは極性の異なる第２活物質層が形成されている。第１電極板は、第１セパレータの一部に形成された第１溶着部と、第２セパレータの一部に形成された第２溶着部と、が溶着されることで第１セパレータと第２セパレータとに包まれて第１セパレータ及び第２セパレータと一体とされている。第２電極板は、一方向に突出したタブ部を有する。タブ部は、第２活物質層が形成されていない第２活物質層非形成領域である。第２電極板は、タブ部において、第１セパレータの第１溶着部もしくは第２セパレータの第２溶着部、のいずれか一方と溶着されて、第１セパレータと第１電極板と第２セパレータと一体とされている。 According to another feature, the electrode unit may have the following configuration instead of the above configuration. For example, the electrode unit includes a first electrode plate on which a first active material layer is formed, a first separator covering a first surface of the first electrode plate, and a second of the first electrode plate opposite to the first surface. It has the 2nd separator which covers a field. Furthermore, the electrode unit has a second electrode plate facing the first electrode plate via the first separator or the second separator, and the second electrode plate has a second active material different in polarity from the first electrode plate. A layer is formed. The first electrode plate is formed by welding the first welded portion formed in a part of the first separator and the second welded portion formed in a part of the second separator. It is wrapped in a separator and made integral with the first separator and the second separator. The second electrode plate has a tab portion that protrudes in one direction. The tab portion is a second active material layer non-forming region in which the second active material layer is not formed. The second electrode plate is welded to either the first weld portion of the first separator or the second weld portion of the second separator in the tab portion, and the first separator, the first electrode plate, and the second separator It is considered one.
　したがって第１セパレータと第２セパレータとに一体に包まれた第１電極板と、第２電極板とが第１セパレータもしくは第２セパレータを介して一体となっている。この電極ユニットを順に積層することで、複数の第１電極板と複数の第２電極板とがセパレータを介して交互に積層された電極組立体を製造することができる。このようにして電極ユニットを順に積層して電極組立体を製造する方法によると、セパレータに包まれた第１電極板と、第２電極板とを順に積層して電極組立体を製造する従来の方法に比べて、電極板の積層時間が短縮され、電極組立体の製造効率が向上する。 Therefore, the first electrode plate integrally covered with the first separator and the second separator and the second electrode plate are integrated via the first separator or the second separator. By stacking the electrode units in order, it is possible to manufacture an electrode assembly in which a plurality of first electrode plates and a plurality of second electrode plates are alternately stacked via a separator. According to the method of manufacturing the electrode assembly by sequentially laminating the electrode units in this manner, a conventional electrode assembly is manufactured by sequentially laminating the first electrode plate and the second electrode plate wrapped in the separator. Compared to the method, the lamination time of the electrode plate is shortened, and the manufacturing efficiency of the electrode assembly is improved.
　他の特徴によると、第１セパレータの第１溶着部と第２セパレータの第２溶着部とのそれぞれは、第１電極板を第１面もしくは第２面に平行な方向に跨いで対向する箇所に設けられ得る。例えば溶着部は、第１電極板の上下両側、あるいは左右両側に位置する。そのため第１電極板の移動が溶着部によって規制される。そして第１電極板は、対向する溶着部の間で位置決めされる。 According to another feature, each of the first welded portion of the first separator and the second welded portion of the second separator is a portion where the first electrode plate is opposed in a direction parallel to the first surface or the second surface. Can be provided. For example, the welds are located on both the upper and lower sides or both left and right sides of the first electrode plate. Therefore, the movement of the first electrode plate is restricted by the welding portion. The first electrode plate is then positioned between the facing welds.
　他の特徴によると、第１電極板は、一方向に突出した第１タブ部を有し得る。第１タブ部は、第１活物質層が形成されていない第１活物質層非形成領域である。第１タブ部は、第１セパレータの第１溶着部及び第２セパレータの第２溶着部と溶着されている。これにより第１電極板が両セパレータに対して位置ズレすることが防止される。 According to another feature, the first electrode plate may have a first tab portion protruding in one direction. The first tab portion is a first active material layer non-forming region in which the first active material layer is not formed. The first tab portion is welded to the first welded portion of the first separator and the second welded portion of the second separator. This prevents the first electrode plate from being displaced relative to the two separators.
　他の特徴によると、第２活物質層非形成領域は、第２電極板において、少なくとも、タブ部の突出方向に対して反対側の縁部の周囲であるタブ対向縁部周囲部と、タブ部とに設けられ得る。第２電極板のタブ対向縁部周囲部が、第１セパレータの第１溶着部もしくは第２セパレータの第２溶着部のいずれか一方と溶着され得る。 According to another feature, in the second electrode plate, the second active material layer non-forming region is at least a tab facing edge peripheral portion that is a periphery of the edge opposite to the projecting direction of the tab portion; It can be provided on the part. The periphery of the tab facing edge of the second electrode plate may be welded to either the first weld of the first separator or the second weld of the second separator.
　したがって第２電極板は、その面上における相反する方向側の端部箇所が、第１セパレータもしくは第２セパレータと溶着されている。例えば第２電極板の上下両側、あるいは左右両側が第１セパレータもしくは第２セパレータと溶着されている。これにより第２電極板は、自身が溶着されたセパレータに対して位置決めされ、自身が溶着されたセパレータを介して常に正極板と対向した状態が維持される。 Therefore, in the second electrode plate, end portions on opposite sides in the surface thereof are welded to the first separator or the second separator. For example, both upper and lower sides or both left and right sides of the second electrode plate are welded to the first separator or the second separator. Thus, the second electrode plate is positioned with respect to the separator to which the second electrode plate is welded, and the state in which the second electrode plate always faces the positive electrode plate is maintained via the separator to which the second electrode plate is welded.
　他の特徴によると、第１電極板が正極であり、第２電極板が負極であり得る。したがって電極ユニットを積層することで、正極と負極とが交互に重ねられた電極組立体が形成され得る。 According to another feature, the first electrode plate may be a positive electrode and the second electrode plate may be a negative electrode. Therefore, by laminating the electrode unit, an electrode assembly in which the positive electrode and the negative electrode are alternately stacked can be formed.
　他の特徴は、電極ユニットの製造方法に関する。該製造方法によると、所定間隔をあけて一列に並べられた複数の第１電極板の第１面を長尺状の第１セパレータで覆い、複数の第１電極板の第２面を長尺状の第２セパレータで覆う。第１セパレータもしくは第２セパレータを介して第２電極板を第１電極板と対向するように第１セパレータの側もしくは第２セパレータの側から重ねる。第１セパレータの第１溶着部と第２セパレータの第２溶着部との溶着を行う。隣り合う第１電極板の間で第１セパレータと第２セパレータとを切断する。第１セパレータと第１電極板と第２セパレータと第２電極板とが第１セパレータの第１溶着部及び第２セパレータの第２溶着部によって一体とされる。 Another feature relates to a method of manufacturing an electrode unit. According to the manufacturing method, the first surfaces of the plurality of first electrode plates arranged in a line at predetermined intervals are covered with the elongated first separator, and the second surfaces of the plurality of first electrode plates are elongated. Covered with a second separator. The second electrode plate is overlapped from the side of the first separator or the side of the second separator so as to face the first electrode plate via the first separator or the second separator. Welding is performed between the first welding portion of the first separator and the second welding portion of the second separator. The first separator and the second separator are cut between the adjacent first electrode plates. The first separator, the first electrode plate, the second separator, and the second electrode plate are integrated by the first welded portion of the first separator and the second welded portion of the second separator.
　したがって重ねられた第１セパレータと第１電極板と第２セパレータと第２電極板とにおいて、両セパレータの溶着部の溶着を行う。その後、隣り合う第１電極板の間で両セパレータを切断する。これにより電極ユニットが製造され得る。 Therefore, the welded portions of both separators are welded in the first separator, the first electrode plate, the second separator, and the second electrode plate which are stacked. Thereafter, both separators are cut between the adjacent first electrode plates. Thereby, an electrode unit can be manufactured.
　他の特徴によると、電極ユニットの製造方法において、重ねられた第１セパレータと第１電極板と第２セパレータと第２電極板とに対して、これらの積層方向の両側から、第１セパレータの第１溶着部及び第２セパレータの第２溶着部の位置において、加熱状態の溶融具を押し付ける。これにより第１セパレータの第１溶着部と第２セパレータの第２溶着部とを溶着する。そして第１セパレータと第１電極板と第２セパレータと第２電極板とを一体とする。 According to another feature, in the method of manufacturing an electrode unit, the first separator, the first electrode plate, the second separator, and the second electrode plate, which are stacked, are made of the first separator from both sides in the stacking direction. The heated melting tool is pressed at the positions of the first welded portion and the second welded portion of the second separator. Thereby, the first welded portion of the first separator and the second welded portion of the second separator are welded. Then, the first separator, the first electrode plate, the second separator, and the second electrode plate are integrated.
　したがって第１セパレータ及び第２セパレータの溶着部を溶着するのみで、第１セパレータと第１電極板と第２セパレータと第２電極板とが一体とされる。そのため電極ユニットの製造効率が向上する。 Therefore, the first separator, the first electrode plate, the second separator, and the second electrode plate are integrated only by welding the welded portions of the first separator and the second separator. Therefore, the manufacturing efficiency of the electrode unit is improved.
電極組立体が収容された蓄電装置（２次電池）の外観斜視図である。It is an external appearance perspective view of the electrical storage apparatus (secondary battery) in which the electrode assembly was accommodated. 電極ユニットの正面図である。It is a front view of an electrode unit. 電極ユニットを分解斜視図である。It is an exploded perspective view of an electrode unit. 図２のIV-IV矢視方向の断面図である。It is sectional drawing of the IV-IV arrow direction of FIG. 電極ユニットの製造方法を表した工程説明図である。It is process explanatory drawing showing the manufacturing method of an electrode unit. 他の実施形態に係る電極ユニットの正面図である。It is a front view of the electrode unit concerning other embodiments. 他の実施形態に係る電極ユニットの正面図である。It is a front view of the electrode unit concerning other embodiments. 他の実施形態に係る電極ユニットの正面図である。It is a front view of the electrode unit concerning other embodiments. 他の実施形態に係る電極ユニットの正面図である。It is a front view of the electrode unit concerning other embodiments. 図９の電極ユニットの分解斜視図である。It is a disassembled perspective view of the electrode unit of FIG. 図９のXI-XI矢視方向の断面図である。FIG. 10 is a cross-sectional view in the direction of arrows XI-XI in FIG. 9; 他の実施形態に係る電極ユニットの正面図である。It is a front view of the electrode unit concerning other embodiments. 他の実施形態に係る電極ユニットの正面図である。It is a front view of the electrode unit concerning other embodiments.
　以下、本発明を実施するための形態を、図面を用いて説明する。リチウムイオン２次電池である蓄電装置１０の内部には、図１に示すように、電極組立体２０と電解液（図示省略）とが収容されている。蓄電装置１０は、ケース１２の上面を貫通する２つの外部接続端子１４,１６を通じて、放電時においては外部に電力を供給し、充電時においては外部から電力が供給される。 Hereinafter, modes for carrying out the present invention will be described using the drawings. As shown in FIG. 1, an electrode assembly 20 and an electrolyte (not shown) are accommodated in the storage device 10 which is a lithium ion secondary battery. Power storage device 10 supplies power to the outside at the time of discharge through two external connection terminals 14 and 16 penetrating the upper surface of case 12 and is supplied from the outside at the time of charge.
　電極組立体２０は、図１に示すように、複数の電極ユニット３０を積層して構成されている。電極ユニット３０は、図２～４で示すように、第１電極板である正極板４０と、正極板４０の第１面（図３において裏面側）の全域を覆う第１セパレータ５０と、正極板４０の第１面とは反対側の第２面の全域を覆う第２セパレータ６０と、第２セパレータ６０を間にして正極板４０の第２面全域と対向する第２電極板である負極板７０と、を有する。負極板７０は、図２に示す正面視で、後述の負極板タブ部７０Ｔの先端部を除く部分が両セパレータ５０,６０の範囲内に位置している。 The electrode assembly 20 is configured by laminating a plurality of electrode units 30, as shown in FIG. As shown in FIGS. 2 to 4, the electrode unit 30 includes a positive electrode plate 40 which is a first electrode plate, a first separator 50 which covers the entire area of the first surface (the back surface side in FIG. 3) of the positive electrode plate 40; A second separator 60 which covers the entire area of the second surface opposite to the first surface of the plate 40, and a negative electrode which is a second electrode plate facing the entire second surface of the positive electrode plate 40 with the second separator 60 in between. And a plate 70. In the front view shown in FIG. 2, a portion of the negative electrode plate 70 excluding the leading end portion of the negative electrode plate tab portion 70T described later is located within the range of both the separators 50 and 60.
　電極ユニット３０の積層方向における電極組立体２０の両側のいずれにも負極板７０が配置されることが好ましい。例えば上述の電極ユニット３０を、負極板７０の側を前面側として順に積層していくと、積層された電極ユニット３０群の最後尾には、第１セパレータ５０を介して正極板４０が配置される。そこで、この積層された電極ユニット３０群の最後尾に負極板７０を一枚追加して配置することが好ましい。 It is preferable that the negative electrode plate 70 be disposed on either side of the electrode assembly 20 in the stacking direction of the electrode unit 30. For example, when the above-described electrode unit 30 is sequentially stacked with the side of the negative electrode plate 70 as the front side, the positive electrode plate 40 is disposed at the end of the stacked electrode unit 30 group with the first separator 50 interposed therebetween. Ru. Therefore, it is preferable to add one negative electrode plate 70 to the end of the stacked electrode unit 30 group.
　正極板４０は、図３,４に示すように、略矩形の集電体４２を有する。集電体４２は、例えばアルミニウム箔といった金属箔である。集電体４２の両面の略全域には、第１活物質層である正極活物質層４４が形成されている。正極活物質層４４は、例えばリチウム含有金属酸化物といった正極活物質を集電体４２に塗工することで形成されている。正極板４０は、略矩形の一辺である正極板タブ辺４０ａから突出した略矩形の正極板タブ部（第１タブ部）４０Ｔを有する。正極板タブ部４０Ｔは、図２,４に示すように、両セパレータ５０,６０の上縁を越えて延びている。正極板タブ部４０Ｔの両面は、正極活物質層４４が形成されていない正極活物質層非形成領域（第１活物質層非形成領域）４０Ｎである。各正極板４０の正極板タブ部４０Ｔは、図１に示すように、１つにまとめられて一方の外部接続端子１４に接続されている。 The positive electrode plate 40 has a substantially rectangular current collector 42 as shown in FIGS. The current collector 42 is a metal foil such as an aluminum foil, for example. A positive electrode active material layer 44 which is a first active material layer is formed on substantially the entire area of both surfaces of the current collector 42. The positive electrode active material layer 44 is formed, for example, by applying a positive electrode active material such as a lithium-containing metal oxide to the current collector 42. The positive electrode plate 40 has a substantially rectangular positive electrode plate tab portion (first tab portion) 40T which protrudes from a positive electrode plate tab side 40a which is one side of a substantially rectangular shape. The positive electrode plate tab portion 40T extends beyond the upper edges of both the separators 50, 60 as shown in FIGS. Both surfaces of the positive electrode plate tab portion 40T are a positive electrode active material layer non-forming region (first active material layer non-forming region) 40N in which the positive electrode active material layer 44 is not formed. As shown in FIG. 1, the positive electrode plate tab portions 40T of the respective positive electrode plates 40 are combined into one and connected to one external connection terminal 14.
　負極板７０は、図３,４に示すように、集電体７２を有する。集電体７２は、正極板４０の集電体４２より一回り大きい略矩形に構成されている。集電体７２は、例えば銅箔といった金属箔である。集電体７２の両面の全域には、第２活物質層である負極活物質層７４が形成されている。負極活物質層７４は、例えば炭素といった負極活物質を集電体７２に塗工することで形成されている。負極板７０は、略矩形の一辺である負極板タブ辺７０ａから突出した略矩形の負極板タブ部（タブ部）７０Ｔを有する。負極板タブ部７０Ｔは、図２,４に示すように、両セパレータ５０,６０の上縁を越えて延びている。負極板タブ部７０Ｔの両面は、負極活物質層７４が形成されていない負極活物質層非形成領域（第２活物質層非形成領域）７０Ｎである。各負極板７０の負極板タブ部７０Ｔは、図１に示すように、１つにまとめられて一方の外部接続端子１６に接続されている。 As shown in FIGS. 3 and 4, the negative electrode plate 70 has a current collector 72. The current collector 72 is configured in a substantially rectangular shape that is slightly larger than the current collector 42 of the positive electrode plate 40. The current collector 72 is a metal foil such as copper foil, for example. A negative electrode active material layer 74 which is a second active material layer is formed on the entire area of both surfaces of the current collector 72. The negative electrode active material layer 74 is formed, for example, by applying a negative electrode active material such as carbon to the current collector 72. The negative electrode plate 70 has a substantially rectangular negative electrode plate tab portion (tab portion) 70T which protrudes from the negative electrode plate tab side 70a which is one side of a substantially rectangular shape. The negative electrode tab portion 70T extends beyond the upper edges of the separators 50 and 60 as shown in FIGS. A negative electrode active material layer non-forming region (second active material layer non-forming region) 70N in which the negative electrode active material layer 74 is not formed is both surfaces of the negative electrode plate tab portion 70T. As shown in FIG. 1, the negative electrode tab portions 70T of the respective negative electrode plates 70 are combined into one and connected to one external connection terminal 16.
　第１セパレータ５０と第２セパレータ６０は、図２～４に示すように、例えば絶縁性の有る樹脂材製の薄膜である。両セパレータ５０,６０は、負極板７０の集電体７２よりも一回り大きい略矩形に構成されている。 The first separator 50 and the second separator 60 are, for example, thin films made of an insulating resin material as shown in FIGS. Both of the separators 50 and 60 are formed in a substantially rectangular shape which is one size larger than the current collector 72 of the negative electrode plate 70.
　正極板４０と負極板７０と第１セパレータ５０と第２セパレータ６０は、図２,４に示すように、２つの接合領域（Ｆ１,Ｆ２）において接合されて一体となっている。接合領域（Ｆ１,Ｆ２）は、例えば第１セパレータ５０と第２セパレータ６０の一部がレーザなどによって溶融されることで形成される溶着領域である。一方の接合領域であるタブ辺溶着領域（接合領域）Ｆ１は、図２に示す正面視で、負極板タブ辺７０ａの外側を負極板タブ辺７０ａの全長に沿って連続し、かつ、負極板タブ辺７０ａの両端部を越えた位置まで延びている。他方の接合領域であるタブ対向辺溶着領域（接合領域）Ｆ２は、図２に示す正面視で、負極板タブ対向辺７０ｂの外側を負極板タブ対向辺７０ｂの全長に沿って連続し、かつ、負極板タブ対向辺７０ｂの両端部を越えた位置まで延びている。負極板タブ辺７０ａは、負極板タブ部７０Ｔが形成された負極板７０の１辺である。負極板タブ対向辺７０ｂは、負極板タブ辺７０ａと対向する負極板７０の他の１辺である。 As shown in FIGS. 2 and 4, the positive electrode plate 40, the negative electrode plate 70, the first separator 50, and the second separator 60 are joined and integrated in two joining regions (F 1 and F 2). The bonding regions (F1, F2) are welding regions formed by, for example, melting a part of the first separator 50 and the second separator 60 with a laser or the like. The tab side welding area (bonding area) F1 which is one of the bonding areas is continuous from the outside of the negative electrode tab side 70a along the entire length of the negative electrode tab side 70a in the front view shown in FIG. It extends to a position beyond both ends of the tab edge 70a. The tab-facing side welding area (joining area) F2, which is the other joining area, is continuous with the outside of the negative-plate tab opposing side 70b along the entire length of the negative-plate tab opposing side 70b in the front view shown in FIG. , And extends to a position beyond both ends of the negative electrode plate tab opposing side 70b. The negative electrode tab side 70a is one side of the negative electrode plate 70 on which the negative electrode tab portion 70T is formed. The negative electrode plate tab opposing side 70 b is another side of the negative electrode plate 70 opposite to the negative electrode plate tab side 70 a.
　タブ辺溶着領域Ｆ１は、図４に示すように第１タブ辺接合部（第１接合部または第１溶着部）５０ａと第２タブ辺接合部（第２接合部または第２溶着部）６０ａを有する。第１タブ辺接合部５０ａと第２タブ辺接合部６０ａは、例えば第１セパレータ５０と第２セパレータ６０をレーザによって溶融することで形成される。第１タブ辺接合部５０ａと第２タブ辺接合部６０ａは、タブ辺溶着領域Ｆ１全域（図２参照）に亘って連続して形成される。あるいは両タブ辺接合部５０ａ,６０ａは、タブ辺溶着領域Ｆ１（図２参照）において断続的に設けられる。第１タブ辺接合部５０ａと第２タブ辺接合部６０ａは、図４に示すように、正極板タブ部４０Ｔに対応する位置で、正極板タブ部４０Ｔと接合、例えば溶着されている。第２タブ辺接合部６０ａは、負極板タブ部７０Ｔと対応する位置で、負極板タブ部７０Ｔと接合、例えば溶着されている。図４では、太実線にて溶着（接合）箇所Ｙが示されている。 As shown in FIG. 4, the tab side welding area F1 includes a first tab side joint (first joint or first weld) 50a and a second tab side joint (second joint or second weld) 60a. Have. The first tab side joint portion 50a and the second tab side joint portion 60a are formed, for example, by melting the first separator 50 and the second separator 60 with a laser. The first tab side joint portion 50a and the second tab side joint portion 60a are continuously formed across the entire tab side welding area F1 (see FIG. 2). Alternatively, both tab edge joint portions 50a and 60a are intermittently provided in the tab edge welding area F1 (see FIG. 2). As shown in FIG. 4, the first tab side joint portion 50a and the second tab side joint portion 60a are joined, for example, welded to the positive plate tab portion 40T at a position corresponding to the positive plate tab portion 40T. The second tab side joint portion 60a is joined, for example, welded to the negative electrode tab portion 70T at a position corresponding to the negative electrode tab portion 70T. In FIG. 4, the welding (joining) point Y is shown by a thick solid line.
　タブ対向辺溶着領域Ｆ２は、図４に示すように第１タブ対向辺接合部（第１接合部または第１溶着部）５０ｂと第２タブ対向辺接合部（第２接合部または第２溶着部）６０ｂを有する。第１タブ対向辺接合部５０ｂと第２タブ対向辺接合部６０ｂは、例えば第１セパレータ５０と第２セパレータ６０の一部をレーザによって溶融することで形成される。第１タブ対向辺接合部５０ｂと第２タブ対向辺接合部６０ｂは、タブ対向辺溶着領域Ｆ２全域（図２参照）に亘って連続して形成される。あるいは両タブ対向辺接合部５０ｂ,６０ｂは、タブ対向辺溶着領域Ｆ２において断続的に形成される。 As shown in FIG. 4, the tab opposing side welding area F2 has a first tab opposing side joint (first joint or first welding) 50b and a second tab opposing side joint (second joint or second welding). Part) 60b. The first tab facing side joint portion 50b and the second tab facing side joint portion 60b are formed, for example, by melting a part of the first separator 50 and the second separator 60 with a laser. The first tab facing side joint portion 50b and the second tab facing side joint portion 60b are continuously formed across the entire tab facing side welding area F2 (see FIG. 2). Alternatively, both tab facing side joint portions 50b and 60b are formed intermittently in the tab facing side welding area F2.
　図２,４に示すように、両タブ辺接合部５０ａ,６０ａは、タブ辺溶着領域Ｆ１において相互に溶着等によって接合されている。両タブ対向辺接合部５０ｂ,６０ｂは、タブ対向辺溶着領域Ｆ２において相互に溶着等によって接合されている。タブ辺溶着領域Ｆ１は、正極板タブ辺４０ａに沿って位置し、タブ対向辺溶着領域Ｆ２は、正極板タブ対向辺４０ｂに沿って位置する。両セパレータ５０,６０は、正極板４０の両側に位置する対向する２箇所で相互に溶着されている。そのため、正極板４０は両セパレータ５０,６０に包まれ、かつ、両セパレータ５０,６０と一体となっている。タブ辺溶着領域Ｆ１では、第２タブ辺接合部６０ａに負極板タブ部７０Ｔが溶着されている。そのため、負極板７０は、第２セパレータ６０によって正極板４０及び第１セパレータ５０と一体となっている。正極板タブ辺４０ａは、正極板タブ部４０Ｔが形成される正極板４０の１辺である。正極板タブ対向辺４０ｂは、正極板タブ辺４０ａと対向する正極板４０の他の１辺である。 As shown in FIGS. 2 and 4, the tab side joint portions 50a and 60a are joined to each other by welding or the like in the tab side welding area F1. The two tab opposing side joint portions 50b and 60b are joined to each other by welding or the like in the tab opposing side welding region F2. The tab side welding area F1 is positioned along the positive electrode plate tab side 40a, and the tab opposing side welding area F2 is positioned along the positive electrode plate tab opposing side 40b. The two separators 50 and 60 are welded to each other at two opposing positions located on both sides of the positive electrode plate 40. Therefore, the positive electrode plate 40 is encased in both separators 50 and 60, and is integrated with both separators 50 and 60. In the tab side welding area F1, the negative electrode tab portion 70T is welded to the second tab side joint portion 60a. Therefore, the negative electrode plate 70 is integrated with the positive electrode plate 40 and the first separator 50 by the second separator 60. The positive electrode plate tab side 40a is one side of the positive electrode plate 40 on which the positive electrode plate tab portion 40T is formed. The positive electrode plate tab opposing side 40 b is another side of the positive electrode plate 40 opposite to the positive electrode plate tab side 40 a.
　正極板４０は、正極板４０を間にして対向する２箇所の接合部、すなわち、両タブ辺接合部５０ａ,６０ａと両タブ対向辺接合部５０ｂ,６０ｂとによって図２,４の上下方向への移動が規制される。これにより正極板４０は、両タブ辺接合部５０ａ,６０ａと両タブ対向辺接合部５０ｂ,６０ｂとの間に位置決めされている。正極板タブ部４０Ｔが両タブ辺接合部５０ａ,６０ａと溶着されることで、正極板４０が両セパレータ５０,６０に対して位置ズレすることが防止されている。なお、正極板タブ部４０Ｔは、両タブ辺接合部５０ａ,６０ａのうち、いずれか一方のみと溶着されていてもよい。 The positive electrode plate 40 is directed in the vertical direction in FIGS. 2 and 4 by two joint portions facing each other with the positive electrode plate 40 in between, that is, both tab side joint portions 50a and 60a and both tab opposite side joint portions 50b and 60b. Movement is regulated. Thereby, the positive electrode plate 40 is positioned between the both tab side joint portions 50a, 60a and the both tab opposing side joint portions 50b, 60b. By welding the positive electrode plate tab portion 40T to the both tab side joint portions 50a and 60a, displacement of the positive electrode plate 40 with respect to both the separators 50 and 60 is prevented. The positive electrode plate tab portion 40T may be welded to only one of the both tab side joint portions 50a and 60a.
　電極ユニット３０は、図５に示す各工程にて製造される。まず包み工程Ｓ１にて、所定間隔で一列に搬送される正極板４０が、上下両面からセパレータで覆われる。正極板４０は、その第１面が長尺状の第１セパレータ５０によって覆われ、第２面が長尺状の第２セパレータ６０によって覆われる。第１セパレータ５０および第２セパレータ６０は、それぞれ対応するロール体３０２から巻き出され、相対向する２つの押し付けロール３０４で正極板４０に押し付けられる。 The electrode unit 30 is manufactured in each process shown in FIG. First, in the wrapping step S1, the positive electrode plate 40 transported in a line at a predetermined interval is covered with separators from both upper and lower sides. A first surface of the positive electrode plate 40 is covered by a long first separator 50, and a second surface is covered by a long second separator 60. Each of the first separator 50 and the second separator 60 is unwound from the corresponding roll body 302 and pressed against the positive electrode plate 40 by the two opposing pressing rolls 304.
　この後、負極板重ね工程Ｓ２にて、両セパレータ５０,６０に挟まれた正極板４０に対して、第２セパレータ６０の側から負極板７０が重ねられる。負極板７０は、第２セパレータを間にして、当該負極板７０が正極板４０の第２面全域と対向するように第２セパレータ６０に重ねられる。 Thereafter, in the negative electrode plate stacking step S2, the negative electrode plate 70 is stacked from the side of the second separator 60 on the positive electrode plate 40 sandwiched between the separators 50 and 60. The negative electrode plate 70 is superimposed on the second separator 60 such that the negative electrode plate 70 faces the entire second surface of the positive electrode plate 40 with the second separator therebetween.
　この後、溶着工程Ｓ３にて、タブ辺溶着領域Ｆ１とタブ対向辺溶着領域Ｆ２を形成する。溶着工程Ｓ３では、溶着可能な温度に加熱された一対の溶融具３０６が使用される。例えば、両溶融具３０６は円柱状の主部３０６ａを有するとともに、主部３０６ａの軸線方向の両端部に、主部３０６ａよりも径の大きい円盤部３０６ｂを有する。両溶融具３０６の円盤部３０６ｂが、重ねられた第１セパレータ５０と正極板４０と第２セパレータ６０と負極板７０とに対して、これらの積層方向の両側から、タブ辺溶着領域Ｆ１とタブ対向辺溶着領域Ｆ２との位置に押し付けられる。これによりタブ辺溶着領域Ｆ１とタブ対向辺溶着領域Ｆ２がそれぞれ溶融される。タブ辺溶着領域Ｆ１では、図４に示す両タブ辺接合部５０ａ,６０ａが溶融されるとともに、両タブ辺接合部５０ａ,６０ａと正極板タブ部４０Ｔとが溶着され、第２タブ辺接合部６０ａと負極板タブ部７０Ｔが溶着される。また、タブ対向辺溶着領域Ｆ２では、図４に示す両タブ対向辺接合部５０ｂ,６０ｂが溶着される。こうしてタブ辺溶着領域Ｆ１とタブ対向辺溶着領域Ｆ２とがそれぞれ形成されることで、第１セパレータ５０と正極板４０と第２セパレータ６０と負極板７０とが一体とされる。 Thereafter, in the welding step S3, the tab side welding area F1 and the tab opposing side welding area F2 are formed. In the welding step S3, a pair of melting tools 306 heated to a temperature at which welding can be performed is used. For example, both the melting tools 306 have a cylindrical main portion 306a, and have disk portions 306b larger in diameter than the main portion 306a at both axial ends of the main portion 306a. The disc portion 306b of both the melting tools 306, with respect to the stacked first separator 50, the positive electrode plate 40, the second separator 60, and the negative electrode plate 70, the tab side welding area F1 and the tabs It is pressed against the position of the facing side welding area F2. Thereby, the tab side welding area F1 and the tab opposing side welding area F2 are respectively melted. In the tab side welding area F1, both tab side joint portions 50a and 60a shown in FIG. 4 are melted, and both tab side joint portions 50a and 60a and the positive electrode plate tab portion 40T are welded, and a second tab side joint portion 60a and the negative electrode tab portion 70T are welded. Further, in the tab facing side welding area F2, both tab facing side joint portions 50b and 60b shown in FIG. 4 are welded. By forming the tab side welding area F1 and the tab opposing side welding area F2 in this manner, the first separator 50, the positive electrode plate 40, the second separator 60, and the negative electrode plate 70 are integrated.
　両溶融具３０６の円盤部３０６ｂが、重ねられた第１セパレータ５０と正極板４０と第２セパレータ６０と負極板７０とに対して、回転しながら連続的に互いに押し付けられる。これによりタブ辺溶着領域Ｆ１とタブ対向辺溶着領域Ｆ２が連続して形成される。 The disc portions 306 b of the two melting tools 306 are continuously pressed against each other while rotating while being superimposed on the stacked first separator 50, positive electrode plate 40, second separator 60, and negative electrode plate 70. Thus, the tab side welding area F1 and the tab opposing side welding area F2 are continuously formed.
　溶着工程Ｓ３の後、切断工程Ｓ４が行われる。切断工程Ｓ４では、隣り合う負極板７０の間で、第１セパレータ５０と第２セパレータ６０が、例えばカッター装置（図示省略）にて切断される。こうして、第１セパレータ５０と正極板４０と第２セパレータ６０と負極板７０とが一体とされた電極ユニット３０が完成する。 After the welding step S3, a cutting step S4 is performed. In the cutting step S4, the first separator 50 and the second separator 60 are cut, for example, by a cutter (not shown) between the adjacent negative electrode plates 70. Thus, the electrode unit 30 in which the first separator 50, the positive electrode plate 40, the second separator 60, and the negative electrode plate 70 are integrated is completed.
　この後、電極ユニット３０は、積層工程Ｓ５に送られて、順に積層される。積層工程Ｓ５では、積層装置３２０が使用される。積層装置３２０は、電極ユニット３０を積層するための積層ボックス３２４と、積層ボックス３２４の上方に位置して積層ボックス３２４に電極ユニット３０を落とし込むためのスライド面３２２を有する。積層ボックス３２４は、上に開放された直方体状であり、その底面３２４ａが水平面Ｗに対して所定角度Ｖで傾斜して配置されている。スライド面３２２から積層ボックス３２４に落とし込まれた電極ユニット３０は、下方側に位置する積層ボックス３２４の側面の上に順に積層されていく。各電極ユニット３０は、両タブ部４０Ｔ,７０Ｔが上方を向いた起立状態にて積層ボックス３２４に落とし込まれ、その起立状態のまま積層されていく。 Thereafter, the electrode unit 30 is sent to the stacking step S5 and stacked in order. In the stacking step S5, the stacking device 320 is used. The laminating apparatus 320 has a laminating box 324 for laminating the electrode unit 30, and a slide surface 322 located above the laminating box 324 for dropping the electrode unit 30 into the laminating box 324. The stacked box 324 is in the form of a rectangular parallelepiped opened upward, and the bottom surface 324 a is arranged to be inclined at a predetermined angle V with respect to the horizontal surface W. The electrode units 30 dropped into the stack box 324 from the slide surface 322 are stacked in order on the side surface of the stack box 324 located on the lower side. Each electrode unit 30 is dropped into the stacking box 324 in a standing state in which both tab portions 40T and 70T face upward, and is stacked in the standing state.
　既に説明したように、電極ユニット３０では、第１セパレータ５０と第２セパレータ６０とに一体に包まれた正極板４０と、負極板７０とが第２セパレータ６０を間において一体となっている。したがって、積層ボックス３２４にて電極ユニット３０を順に積層すると、複数の正極板４０と複数の負極板７０とがセパレータを間において交互に積層された電極組立体２０が製造される。このように電極ユニット３０を順に積層して電極組立体２０を製造する方法によると、セパレータに包まれた正極板と、負極板とを順に積層して電極組立体を製造する従来の方法に比べて、電極板の積層時間が短縮され、電極組立体の製造効率が向上する。 As described above, in the electrode unit 30, the positive electrode plate 40 and the negative electrode plate 70 integrally covered with the first separator 50 and the second separator 60 are integrated with the second separator 60 in between. Therefore, when the electrode units 30 are sequentially stacked in the stacking box 324, an electrode assembly 20 in which a plurality of positive electrode plates 40 and a plurality of negative electrode plates 70 are alternately stacked with a separator interposed therebetween is manufactured. According to the method of manufacturing the electrode assembly 20 by sequentially stacking the electrode units 30 in this manner, compared to the conventional method of manufacturing the electrode assembly by sequentially laminating the positive electrode plate and the negative electrode plate wrapped by the separator Thus, the lamination time of the electrode plate is shortened, and the manufacturing efficiency of the electrode assembly is improved.
　既に述べたように、電極ユニット３０の積層方向における電極組立体２０の両端部のそれぞれに負極板７０が配置されることが好ましい。電極ユニット３０を、図５に示すようにして負極板７０の側を前面側として順に重ねていくと、積層された電極ユニット３０群の最後尾においては、第１セパレータ５０を介して正極板４０が配置されることとなる。そこで、積層された電極ユニット３０群の最後尾に負極板７０を一枚追加して配置することが好ましい。 As described above, it is preferable that the negative electrode plate 70 be disposed at each end of the electrode assembly 20 in the stacking direction of the electrode unit 30. When the electrode unit 30 is stacked in order with the side of the negative electrode plate 70 as the front side as shown in FIG. 5, the positive electrode plate 40 is interposed with the first separator 50 at the end of the stacked electrode unit 30 group. Will be placed. Therefore, it is preferable that one negative electrode plate 70 be additionally disposed at the end of the stacked electrode unit 30 group.
　上述した電極ユニット３０の製造方法によれば、重ねられた第１セパレータ５０と正極板４０と第２セパレータ６０と負極板７０とに対して、タブ辺溶着領域Ｆ１とタブ対向辺溶着領域Ｆ２との位置を溶着する。この溶着の工程のみで、第１セパレータ５０と正極板４０と第２セパレータ６０と第２の負極板７０とが一体とされる。これにより電極ユニット３０の製造効率がよい。 According to the method of manufacturing the electrode unit 30 described above, the tab side welding area F1 and the tab opposing side welding area F2 with respect to the stacked first separator 50, the positive electrode plate 40, the second separator 60, and the negative electrode plate 70. Weld the position of. The first separator 50, the positive electrode plate 40, the second separator 60, and the second negative electrode plate 70 are integrated by only this welding step. Thereby, the manufacturing efficiency of the electrode unit 30 is good.
　図２～５に示す電極ユニット３０において、負極板７０を第１セパレータ５０の側から重ね合わせてもよい。この場合、負極板７０は、第１セパレータ５０を間において正極板４０の第１面全域と対向するように配置される。この場合、タブ辺溶着領域Ｆ１にて第１タブ辺接合部５０ａと負極板タブ部７０Ｔとが溶着される。 In the electrode unit 30 shown in FIGS. 2 to 5, the negative electrode plate 70 may be superimposed from the side of the first separator 50. In this case, the negative electrode plate 70 is disposed to face the entire first surface of the positive electrode plate 40 with the first separator 50 therebetween. In this case, the first tab side joint portion 50a and the negative electrode plate tab portion 70T are welded in the tab side welding area F1.
　図２～５に示す構成に代えて、第１セパレータ５０と第２セパレータ６０とで負極板７０を包み、第１セパレータ５０もしくは第２セパレータ６０の上に正極板４０を重ねてもよい。この場合、タブ辺溶着領域Ｆ１は、両タブ辺接合部５０ａ,６０ａ同士が溶着される部分と、両タブ辺接合部５０ａ,６０ａと負極板タブ部７０Ｔとが溶着される部分と、正極板タブ部４０Ｔと対向するセパレータのタブ辺溶着部と正極板タブ部４０Ｔとが溶着される部分とを有する。 Instead of the configuration shown in FIGS. 2 to 5, the negative electrode plate 70 may be wrapped by the first separator 50 and the second separator 60, and the positive electrode plate 40 may be stacked on the first separator 50 or the second separator 60. In this case, the tab side welding area F1 includes a portion where both tab side joint portions 50a and 60a are welded, a portion where both tab side joint portions 50a and 60a and the negative electrode tab portion 70T are welded, and a positive electrode plate A tab edge welding portion of the separator facing the tab portion 40T and a portion to which the positive electrode plate tab portion 40T is welded are provided.
　図２～５に示す電極ユニット３０に代えて、図６～８に示す電極ユニット３０ａ～３０ｃを採用してもよい。図６に示す電極ユニット３０ａは、図２に示すタブ辺溶着領域Ｆ１に代えて負極板タブ部７０Ｔの周囲のみに形成されたタブ辺溶着領域Ｆ３を有する。図７に示す電極ユニット３０ｂは、図２に示すタブ辺溶着領域Ｆ１に代えて負極板タブ部７０Ｔの周囲のみに形成されたタブ辺溶着領域Ｆ３を有し、図２に示すタブ対向辺溶着領域Ｆ２を有していない。図８に示す電極ユニット３０ｃは、タブ辺溶着領域Ｆ１を有するものの、図２に示すタブ対向辺溶着領域Ｆ２を有していない。図６～８および、つぎに説明する図９～１３において、図２～５と同一もしくは均等な構成・機能を有する箇所には同一の符号を付すことで、重複した説明を省略する。 Instead of the electrode unit 30 shown in FIGS. 2 to 5, electrode units 30 a to 30 c shown in FIGS. 6 to 8 may be employed. The electrode unit 30a shown in FIG. 6 has a tab side welding area F3 formed only on the periphery of the negative electrode tab portion 70T instead of the tab side welding area F1 shown in FIG. The electrode unit 30b shown in FIG. 7 has a tab side welding area F3 formed only on the periphery of the negative electrode tab portion 70T instead of the tab side welding area F1 shown in FIG. There is no area F2. Although the electrode unit 30c shown in FIG. 8 has the tab side welding area F1, it does not have the tab facing side welding area F2 shown in FIG. In FIGS. 6 to 8 and FIGS. 9 to 13 described below, the same reference numerals are given to portions having the same or equivalent configurations and functions as those of FIGS.
　図２～５に示す電極ユニット３０に代えて、図９～１１に示す電極ユニット３０ｄを採用してもよい。図９～１１に示すように、負極板７０における負極板タブ対向辺７０ｂの周囲である周囲部（タブ対向辺縁部周囲部）７６の両面は、負極活物質層非形成領域７０Ｎとなっている。周囲部７６の負極活物質層非形成領域７０Ｎは、負極板タブ対向辺７０ｂから所定幅Ｈを有し、かつ、負極板タブ対向辺７０ｂに沿って連続している。負極板タブ対向辺７０ｂは、図９,１０から明らかなように、負極板タブ部７０Ｔを有する縁部の反対側に位置している。 Instead of the electrode unit 30 shown in FIGS. 2 to 5, an electrode unit 30d shown in FIGS. 9 to 11 may be employed. As shown in FIGS. 9 to 11, the negative electrode active material layer non-forming region 70N is formed on both sides of the peripheral portion (tab peripheral edge peripheral portion) 76 which is a periphery of the negative electrode plate tab opposing side 70b in the negative electrode plate 70. There is. The negative electrode active material layer non-forming region 70N of the peripheral portion 76 has a predetermined width H from the negative electrode plate tab opposing side 70b, and is continuous along the negative electrode plate tab opposing side 70b. The negative electrode tab opposite side 70b is located on the opposite side of the edge having the negative electrode tab portion 70T, as is clear from FIGS.
　電極ユニット３０ｄのタブ対向辺溶着領域Ｆ４は、図１１に示すように、周囲部７６の負極活物質層非形成領域７０Ｎに対応した位置に設けられている。タブ対向辺溶着領域Ｆ４は、図９に示すように、正極板タブ対向辺４０ｂと負極板タブ対向辺７０ｂとの間で、両タブ対向辺４０ｂ,７０ｂの全長に沿って連続し、かつ、負極板タブ対向辺７０ｂの両端部を越えて延びている。 As shown in FIG. 11, the tab facing side welding area F4 of the electrode unit 30d is provided at a position corresponding to the negative electrode active material layer non-forming area 70N of the peripheral portion 76. The tab facing side welding area F4 is continuous along the entire length of both tab facing sides 40b and 70b between the positive plate tab facing side 40b and the negative plate tab facing side 70b, as shown in FIG. It extends beyond the both ends of the negative electrode tab opposite side 70b.
　タブ対向辺溶着領域Ｆ４では、図９,１１に示すように、両タブ対向辺接合部５０ｃ,６０ｃが相互に溶着する。さらにタブ対向辺溶着領域Ｆ４では、第２タブ対向辺接合部６０ｃが周囲部７６の負極活物質層非形成領域７０Ｎと溶着する。 In the tab facing side welding area F4, as shown in FIGS. 9 and 11, both tab facing side joint portions 50c and 60c are welded to each other. Further, in the tab facing side welding area F4, the second tab facing side joint portion 60c is welded to the negative electrode active material layer non-forming area 70N of the peripheral portion 76.
　図９に示すようにタブ辺溶着領域Ｆ１が負極板７０の負極板タブ辺７０ａの近傍に位置し、タブ辺溶着領域Ｆ１において負極板タブ部７０Ｔが第２セパレータ６０と溶着されている。負極板タブ辺７０ａに対向する負極板タブ対向辺７０ｂの近傍に周囲部７６を有し、周囲部７６が第２セパレータ６０と溶着されている。したがって負極板７０の両端部が第２セパレータ６０に溶着される。これにより負極板７０は第２セパレータ６０に対して移動し難く、常に正極板４０と対向した状態が維持される。 As shown in FIG. 9, the tab side welding area F1 is located in the vicinity of the negative electrode tab side 70a of the negative electrode plate 70, and the negative electrode tab portion 70T is welded to the second separator 60 in the tab side welding area F1. A peripheral portion 76 is provided in the vicinity of the negative electrode plate tab opposing side 70 b facing the negative electrode plate tab side 70 a, and the peripheral portion 76 is welded to the second separator 60. Therefore, both ends of the negative electrode plate 70 are welded to the second separator 60. As a result, the negative electrode plate 70 is difficult to move relative to the second separator 60, and the state in which the negative electrode plate 70 faces the positive electrode plate 40 is always maintained.
　タブ対向辺溶着領域Ｆ４は、負極板７０の長手方向全長あるいはセパレータ５０，６０の長手方向全長において形成されても良いし、負極板７０の端縁に沿って断続的に形成されても良い。換言すると、両タブ対向辺接合部５０ｃ,６０ｃの相互の溶着は、セパレータ５０，６０の端縁に沿って断続的であっても良い。第２タブ対向辺接合部６０ｃと周囲部７６の負極活物質層非形成領域７０Ｎとの溶着は、負極板７０の端縁に沿って断続的に形成されても良い。 The tab facing side welding area F4 may be formed along the entire length in the longitudinal direction of the negative electrode plate 70 or the entire length in the longitudinal direction of the separators 50, 60, or may be formed intermittently along the edge of the negative electrode plate 70. In other words, the mutual welding of both tab facing side joints 50c, 60c may be intermittent along the edge of the separators 50, 60. The welding between the second tab facing side joint portion 60c and the negative electrode active material layer non-forming region 70N of the peripheral portion 76 may be intermittently formed along the edge of the negative electrode plate 70.
　図１２に示すように電極ユニット３０ｅは、負極板タブ部７０Ｔの周囲のみに形成されたタブ辺溶着領域Ｆ３と、負極板７０と第２セパレータ６０を溶着するタブ対向辺溶着領域Ｆ４を有していてもよい。図１３に示すように電極ユニット３０ｆは、図９等に示すタブ辺溶着領域Ｆ１を有さず、タブ対向辺溶着領域Ｆ４を有していてもよい。図１２,１３において、図９～１１と同一もしくは均等な構成・機能を有する箇所には同一の符号を付すことで、重複した説明を省略する。 As shown in FIG. 12, the electrode unit 30e has a tab side welding area F3 formed only around the negative electrode plate tab portion 70T, and a tab opposing side welding area F4 for welding the negative electrode plate 70 and the second separator 60. It may be As shown in FIG. 13, the electrode unit 30f may not have the tab side welding area F1 shown in FIG. 9 etc., and may have the tab facing side welding area F4. In FIGS. 12 and 13, parts having the same or equivalent configurations and functions as those in FIGS.
　上述するように第２電極板は、第２活物質層非形成領域において、第１セパレータの第１接合部もしくは第２セパレータの第２接合部のいずれか一方と接合されている。例えば図４の負極板７０は、負極活物質層非形成領域７０Ｎにおいて、第２セパレータ６０の第２タブ辺接合部６０ａと溶着されている。図１３の負極板７０は、負極活物質層非形成領域７０Ｎにおいて、第２セパレータ６０の一部と溶着されている。これに代えて、第２電極板は、例えば第１接合部もしくは第２接合部に対して接着剤によって接着、接合両面テープによって接合されても良い。 As described above, the second electrode plate is joined to either the first joining portion of the first separator or the second joining portion of the second separator in the region where the second active material layer is not formed. For example, the negative electrode plate 70 of FIG. 4 is welded to the second tab side joint portion 60a of the second separator 60 in the negative electrode active material layer non-forming region 70N. The negative electrode plate 70 of FIG. 13 is welded to a part of the second separator 60 in the negative electrode active material layer non-forming region 70N. Instead of this, for example, the second electrode plate may be bonded by an adhesive to the first bonding portion or the second bonding portion, and may be bonded by a bonding double-sided tape.
　添付の図面を参照して詳細に上述した種々の実施例は、本発明の代表例であって本発明を限定するものではありません。詳細な説明は、本教示の様々な態様を作成、使用および／または実施するために、当業者に教示するものであって、本発明の範囲を限定するものではありません。更に、上述した各付加的な特徴および教示は、改良された燃料蒸気処理装置および/またはその製造方法と使用方法を提供するため、別々にまたは他の特徴および教示と一緒に適用および／または使用され得るものです。 The various embodiments described above in detail with reference to the accompanying drawings are representative of the present invention and are not intended to limit the present invention. The detailed description teaches those skilled in the art to make, use, and / or practice various aspects of the present teachings, and is not intended to limit the scope of the present invention. Furthermore, each additional feature and teaching described above may be applied and / or used separately or in conjunction with other features and teaching to provide an improved fuel vapor processing apparatus and / or a method of making and using the same. It can be done.

Claims (9)

  1. 　電極ユニットであって、
    　第１活物質層が形成された第１電極板と、
    　前記第１電極板の第１面を覆う第１セパレータと、
    　前記第１電極板の前記第１面とは反対側の第２面を覆う第２セパレータと、
    　前記第１セパレータもしくは前記第２セパレータを介して前記第１電極板と対向し、かつ、前記第１電極板とは極性の異なる第２活物質層が形成された第２電極板と、を有し、
    　前記第１電極板は、前記第１セパレータの一部に形成された第１接合部と、前記第２セパレータの一部に形成された第２接合部と、が接合されることで前記第１セパレータと前記第２セパレータとに包まれて前記第１セパレータ及び前記第２セパレータと一体とされており、
    　前記第２電極板の縁部には、前記第２活物質層が形成されていない第２活物質層非形成領域を有し、
    　前記第２電極板は、前記第２活物質層非形成領域において、前記第１セパレータの前記第１接合部もしくは前記第２セパレータの前記第２接合部、のいずれか一方と接合されて、前記第１セパレータと前記第１電極板と前記第２セパレータと一体とされている電極ユニット。     An electrode unit,
    A first electrode plate on which a first active material layer is formed;
    A first separator covering a first surface of the first electrode plate;
    A second separator covering a second surface opposite to the first surface of the first electrode plate;
    A second electrode plate facing the first electrode plate via the first separator or the second separator and having a second active material layer having a polarity different from that of the first electrode plate; And
    The first electrode plate is formed by bonding a first bonding portion formed in a portion of the first separator and a second bonding portion formed in a portion of the second separator. Being enclosed by a separator and the second separator, and integral with the first separator and the second separator;
    The edge portion of the second electrode plate has a second active material layer non-forming region in which the second active material layer is not formed,
    The second electrode plate is bonded to either the first bonding portion of the first separator or the second bonding portion of the second separator in the second active material layer non-forming region, An electrode unit integrated with a first separator, the first electrode plate, and the second separator.
  2. 　請求項１に記載の電極ユニットであって、
    　前記第２活物質層非形成領域は、前記第２電極板の前記縁部から突出した形状のタブ部を含み、前記第２電極板は、前記タブ部において、前記第１セパレータの前記第１接合部、もしくは前記第２セパレータの前記第２接合部、のいずれか一方と接合されている電極ユニット。     An electrode unit according to claim 1, wherein
    The second active material layer non-forming region includes a tab portion having a shape protruding from the edge portion of the second electrode plate, and the second electrode plate has the first portion of the first separator in the tab portion. An electrode unit joined to any one of a junction and the second junction of the second separator.
  3. 　電極ユニットであって、
    　第１活物質層が形成された第１電極板と、
    　前記第１電極板の第１面を覆う第１セパレータと、
    　前記第１電極板の前記第１面とは反対側の第２面を覆う第２セパレータと、
    　前記第１セパレータもしくは前記第２セパレータを介して前記第１電極板と対向し、かつ、前記第１電極板とは極性の異なる第２活物質層が形成された第２電極板と、を有し、
    　前記第１電極板は、前記第１セパレータの一部に形成された第１溶着部と、前記第２セパレータの一部に形成された第２溶着部と、が溶着されることで前記第１セパレータと前記第２セパレータとに包まれて前記第１セパレータ及び前記第２セパレータと一体とされており、
    　前記第２電極板は、一方向に突出したタブ部を有し、
    　前記タブ部は、前記第２活物質層が形成されていない第２活物質層非形成領域であり、
    　前記第２電極板は、前記タブ部において、前記第１セパレータの前記第１溶着部もしくは前記第２セパレータの前記第２溶着部、のいずれか一方と溶着されて、前記第１セパレータと前記第１電極板と前記第２セパレータと一体とされている電極ユニット。     An electrode unit,
    A first electrode plate on which a first active material layer is formed;
    A first separator covering a first surface of the first electrode plate;
    A second separator covering a second surface opposite to the first surface of the first electrode plate;
    A second electrode plate facing the first electrode plate via the first separator or the second separator and having a second active material layer having a polarity different from that of the first electrode plate; And
    The first electrode plate is formed by welding a first welding portion formed in a portion of the first separator and a second welding portion formed in a portion of the second separator. Being enclosed by a separator and the second separator, and integral with the first separator and the second separator;
    The second electrode plate has a tab portion protruding in one direction,
    The tab portion is a second active material layer non-forming region where the second active material layer is not formed,
    The second electrode plate is welded to one of the first welding portion of the first separator or the second welding portion of the second separator in the tab portion, and the first separator and the second electrode plate are 1) An electrode unit integrated with an electrode plate and the second separator.
  4. 　請求項３に記載の電極ユニットであって、
    　前記第１セパレータの前記第１溶着部と前記第２セパレータの前記第２溶着部とのそれぞれは、前記第１電極板を前記第１面もしくは前記第２面に平行な方向に跨いで対向する箇所に設けられている電極ユニット。     The electrode unit according to claim 3, wherein
    Each of the first welding portion of the first separator and the second welding portion of the second separator opposes the first electrode plate in a direction parallel to the first surface or the second surface. Electrode unit provided at the place.
  5. 　請求項３または４に記載の電極ユニットであって、
    　前記第１電極板は、一方向に突出した第１タブ部を有し、
    　前記第１タブ部は、前記第１活物質層が形成されていない前記第１活物質層非形成領域であり、かつ、前記第１セパレータの前記第１溶着部及び前記第２セパレータの前記第２溶着部と溶着されている電極ユニット。     The electrode unit according to claim 3 or 4, wherein
    The first electrode plate has a first tab portion protruding in one direction,
    The first tab portion is a region where the first active material layer is not formed and the first active material layer is not formed, and the first welded portion of the first separator and the second of the second separator are 2 Electrode unit welded with welded part.
  6. 　請求項３～５のいずれか１つに記載の電極ユニットであって、
    　前記第２活物質層非形成領域は、前記第２電極板において、少なくとも、前記タブ部の突出方向に対して反対側の縁部の周囲であるタブ対向縁部周囲部と、前記タブ部と、に設けられ、
    　前記第２電極板の前記タブ対向縁部周囲部が、前記第１セパレータの前記第１溶着部もしくは前記第２セパレータの前記第２溶着部、のいずれか一方と溶着されている電極ユニット。     The electrode unit according to any one of claims 3 to 5, wherein
    In the second electrode plate, the second active material layer non-forming region is at least a tab facing edge peripheral portion that is a periphery of an edge opposite to the projecting direction of the tab portion, and the tab portion Provided in
    An electrode unit in which the tab facing edge peripheral portion of the second electrode plate is welded to any one of the first welding portion of the first separator or the second welding portion of the second separator.
  7. 　請求項３～６のいずれか１つに記載の電極ユニットであって、
    　前記第１電極板が正極であり、前記第２電極板が負極である電極ユニット。     The electrode unit according to any one of claims 3 to 6, wherein
    An electrode unit in which the first electrode plate is a positive electrode and the second electrode plate is a negative electrode.
  8. 　請求項３～７のいずれか１つに記載の電極ユニットの製造方法であって、
    　所定間隔をあけて一列に並べられた複数の前記第１電極板の前記第１面を長尺状の前記第１セパレータで覆い、複数の前記第１電極板の前記第２面を長尺状の前記第２セパレータで覆い、
    　前記第１セパレータもしくは前記第２セパレータを介して、前記第２電極板を、前記第１電極板と対向するように前記第１セパレータの側もしくは前記第２セパレータの側から重ね、
    　前記第１セパレータの前記第１溶着部と前記第２セパレータの前記第２溶着部との溶着を行い、
    　隣り合う前記第１電極板の間で前記第１セパレータと前記第２セパレータとを切断し、前記第１セパレータと前記第１電極板と前記第２セパレータと前記第２電極板とが前記第１セパレータの前記第１溶着部及び前記第２セパレータの前記第２溶着部によって一体とされた電極ユニットの製造方法。     A method of manufacturing an electrode unit according to any one of claims 3 to 7, wherein
    The first surfaces of the plurality of first electrode plates arranged in a line at predetermined intervals are covered with the elongated first separators, and the second surfaces of the plurality of first electrode plates are elongated. Cover with the second separator of
    The second electrode plate is stacked from the side of the first separator or the side of the second separator so as to face the first electrode plate via the first separator or the second separator.
    Welding between the first welding portion of the first separator and the second welding portion of the second separator;
    The first separator and the second separator are cut between the adjacent first electrode plates, and the first separator, the first electrode plate, the second separator, and the second electrode plate are members of the first separator. The manufacturing method of the electrode unit integrated by the said 1st welding part and the said 2nd welding part of the said 2nd separator.
  9. 　請求項８に記載の電極ユニットの製造方法であって、
    　重ねられた前記第１セパレータと前記第１電極板と前記第２セパレータと前記第２電極板とに対して、これらの積層方向の両側から、前記第１セパレータの前記第１溶着部及び前記第２セパレータの前記第２溶着部の位置において、加熱状態の溶融具を押し付けることで、前記第１セパレータの前記第１溶着部と前記第２セパレータの前記第２溶着部とを溶着して、前記第１セパレータと前記第１電極板と前記第２セパレータと前記第２電極板とを一体とする電極ユニットの製造方法。     A method of manufacturing an electrode unit according to claim 8, wherein
    With respect to the stacked first separator, the first electrode plate, the second separator, and the second electrode plate, the first welded portion of the first separator and the first welded portion of the first separator are viewed from both sides in the stacking direction thereof. (2) The first welding portion of the first separator and the second welding portion of the second separator are welded by pressing the melting tool in the heated state at the position of the second welding portion of the separator. The manufacturing method of the electrode unit which unites a 1st separator, the said 1st electrode plate, the said 2nd separator, and the said 2nd electrode plate.
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