WO2019123588A1 - Energy storage device - Google Patents

Energy storage device Download PDF

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Publication number
WO2019123588A1
WO2019123588A1 PCT/JP2017/045846 JP2017045846W WO2019123588A1 WO 2019123588 A1 WO2019123588 A1 WO 2019123588A1 JP 2017045846 W JP2017045846 W JP 2017045846W WO 2019123588 A1 WO2019123588 A1 WO 2019123588A1
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WO
WIPO (PCT)
Prior art keywords
negative electrode
positive electrode
edge
electrode
positive
Prior art date
Application number
PCT/JP2017/045846
Other languages
French (fr)
Japanese (ja)
Inventor
雅人 小笠原
厚志 南形
Original Assignee
株式会社 豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 豊田自動織機 filed Critical 株式会社 豊田自動織機
Priority to PCT/JP2017/045846 priority Critical patent/WO2019123588A1/en
Publication of WO2019123588A1 publication Critical patent/WO2019123588A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66—Current collectors
    • H01G11/72—Current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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 a power storage device.
  • lithium ion secondary batteries nickel hydrogen secondary batteries and the like have been known as secondary batteries that are a type of power storage device.
  • a lithium ion secondary battery includes an electrode assembly in which a sheet-like positive electrode and a negative electrode are stacked.
  • the positive electrode includes a rectangular sheet-like positive metal foil and a positive electrode coated portion present on both sides of the positive metal foil.
  • the positive electrode is provided with an exposed uncoated portion of the metal foil at a portion where the positive electrode coated portion does not exist in the positive electrode metal foil.
  • the negative electrode includes a rectangular sheet-like negative electrode metal foil, and a negative electrode coated portion which is also present on both surfaces of the negative electrode metal foil and on both sides of the base of the negative electrode tab.
  • the positive electrode and the negative electrode are manufactured by applying a paste-like active material mixture, which is a mixture of active material particles, a conductive agent, and a binder, onto a surface of a metal foil previously punched out, or in the form of a strip. After the active material mixture is applied to the surface to produce a material for an electrode, the material is punched into the shape of a positive electrode or a negative electrode to produce a material.
  • a paste-like active material mixture which is a mixture of active material particles, a conductive agent, and a binder
  • the material to which the active material mixture is applied is punched to the position to become the negative electrode tab, or the material to which the active material mixture is not applied is punched to the position to become the negative electrode tab. Therefore, the material can not be punched out under the same conditions, and the quality of the negative electrode may vary.
  • An object of the present invention is to provide a power storage device capable of suppressing variation in quality.
  • a storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is
  • the positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coating portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, the surface of the positive electrode main body portion being coated with a positive electrode active material mixture;
  • the positive electrode uncoated portion where the positive electrode active material mixture is not applied along the positive electrode edge and the exposed positive electrode main body is exposed, and the first positive electrode edge and the second positive electrode edge for the positive electrode Height direction of the positive electrode coated portion, where the extending direction of the straight line connecting the When the edge located at one end and on the side of the first positive electrode edge is a positive electrode coating edge, the dimension from the positive
  • the active material mixture protrudes to the part to be the positive electrode uncoated portion, and the height of the positive electrode uncoated portion is Even if the tolerance is deviated, a region to which the active material mixture is not applied is secured in the positive electrode metal foil, and a positive electrode uncoated portion is formed. Therefore, when manufacturing the positive electrode by cutting the positive electrode metal foil coated with the active material mixture, only the positive electrode metal foil is cut at a location along the first positive electrode edge.
  • the positive electrode when manufacturing the positive electrode, there is cutting of only the positive electrode metal foil at a location along the first positive electrode edge, or cutting of a laminated structure of the positive electrode coated portion and the positive electrode metal foil.
  • a storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is
  • the positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coating portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, the surface of the positive electrode main body portion being coated with a positive electrode active material mixture;
  • the positive electrode uncoated portion where the positive electrode active material mixture is not applied along the positive electrode edge and the exposed positive electrode main body is exposed, and the first positive electrode edge and the second positive electrode edge for the positive electrode Height direction of the positive electrode coated portion, where the extending direction of the straight line connecting the When the edge located at one end and on the side of the first positive electrode edge is a positive electrode coating edge, the dimension from the positive
  • the active material mixture protrudes to the part to be the positive electrode uncoated portion, and the height of the positive electrode uncoated portion is Even if the tolerance is deviated, a region to which the active material mixture is not applied is secured in the positive electrode metal foil, and a positive electrode uncoated portion is formed. Therefore, when manufacturing the positive electrode by cutting the positive electrode metal foil coated with the active material mixture, only the positive electrode metal foil is cut at a location along the first positive electrode edge.
  • the positive electrode when manufacturing the positive electrode, only the positive electrode metal foil is cut at a location along the first positive electrode edge, or the laminated structure of the positive electrode coated portion and the positive electrode metal foil is cut.
  • the positive electrode tab is bent from the base end side closer to the first positive electrode edge portion.
  • the upper limit is defined while being larger than the tolerance. For this reason, it is suppressed that the height of a positive electrode uncoated part becomes large too much, and it is suppressing that the protrusion length of the positive electrode tab from a 1st positive electrode edge part becomes short.
  • the protrusion length of the positive electrode tab from the first positive electrode edge, it is suppressed that the stress generated in the bent portion becomes large, and it is suppressed that a crack or the like is formed in the bent portion of the positive electrode tab. It will be easier.
  • a storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is
  • the positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coated portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, and having a surface of the positive electrode main body portion coated with a positive electrode active material mixture, When the direction in which the straight line connecting the first positive electrode edge and the second positive electrode edge is the shortest distance is the height direction, the electrode is located at one end in the height direction of the positive electrode coated portion, and The edge portion on the first positive electrode edge portion side is a positive electrode coated edge portion, and the negative electrode is a negative electrode current collector.
  • the negative electrode current collector includes a rectangular negative electrode main body and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body, and 1 A negative electrode coated portion having a second negative electrode edge portion opposite to the negative electrode edge portion, and formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion; (1) When the extending direction of the straight line connecting the negative electrode edge and the second negative electrode edge at the shortest distance is the height direction, the first negative electrode edge is located at one end in the height direction of the negative electrode coated portion When the side edge is a negative electrode coating edge, the negative electrode coating edge is on the negative electrode tab, and the negative electrode tab protrudes from the first negative electrode edge along the height direction. From the first negative electrode edge in the height direction, the negative electrode being located along the direction beyond the positive electrode coating edge Height to coating edge is greater than the set at a height tolerance range greater than the tolerance shall be summarized in that it is 1.0mm or less.
  • the negative electrode coating edge is shifted to the first negative electrode coating edge side by the tolerance on the negative electrode tab
  • the negative electrode coating portion can be located on the first negative electrode edge. Therefore, when manufacturing the negative electrode by cutting the negative electrode metal foil to which the active material mixture is applied, the laminated structure of the negative electrode metal foil and the negative electrode coated portion is cut along the first negative electrode edge. As a result, for example, when manufacturing the negative electrode, there is cutting of only the negative metal foil at a location along the first negative electrode edge, or cutting of the laminated structure of the negative electrode coated portion and the negative metal foil.
  • a storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is
  • the positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coated portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, and having a surface of the positive electrode main body portion coated with a positive electrode active material mixture, When the direction in which the straight line connecting the first positive electrode edge and the second positive electrode edge is the shortest distance is the height direction, the electrode is located at one end in the height direction of the positive electrode coated portion, and The edge portion on the first positive electrode edge portion side is a positive electrode coated edge portion, and the negative electrode is a negative electrode current collector.
  • the negative electrode current collector includes a rectangular negative electrode main body and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body, and 1 A negative electrode coated portion having a second negative electrode edge portion opposite to the negative electrode edge portion, and formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion; (1) When the extending direction of the straight line connecting the negative electrode edge and the second negative electrode edge at the shortest distance is the height direction, the first negative electrode edge is located at one end in the height direction of the negative electrode coated portion When the side edge is a negative electrode coating edge, the negative electrode coating edge is on the negative electrode tab, and the negative electrode tab protrudes from the first negative electrode edge along the height direction. From the first negative electrode edge in the height direction, the negative electrode being located along the direction beyond the positive electrode coating edge Height to coating edge is summarized in that a 0.5 ⁇ 2.0 mm.
  • the negative electrode coated portion can be located on the first negative electrode edge without the effect of tolerance. Therefore, when manufacturing the negative electrode by cutting the negative electrode metal foil to which the active material mixture is applied, the negative electrode metal foil and the negative electrode coated portion are cut along the first negative electrode edge. As a result, for example, when manufacturing the negative electrode, there is cutting of only the negative metal foil at a location along the first negative electrode edge, or cutting of the laminated structure of the negative electrode coated portion and the negative positive metal foil.
  • the negative electrode tab is bent from a base end side closer to the first negative electrode edge portion.
  • the upper limit is defined while making it larger than the tolerance. For this reason, the height of the negative electrode coating edge is prevented from becoming too large, the negative electrode coated portion existing on the negative electrode tab is reduced, the stress generated in the bent portion is suppressed, and the negative electrode coating on the negative electrode tab It becomes easy to control the falling off of the active material from the department.
  • the positive electrode includes a positive uncoated portion in which the positive electrode active material mixture is not applied along the first positive electrode edge and the positive electrode main body is exposed, and the negative electrode is The negative electrode coating edge is provided on the negative electrode tab, and in the electrode assembly, the negative electrode coating edge is along the direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction. Of the first negative electrode edge portion along the height direction, the first negative electrode edge portion extending along the direction in which the negative electrode tab protrudes from the first negative electrode edge portion. It is located beyond the edge.
  • the power storage device is a secondary battery.
  • BRIEF DESCRIPTION OF THE DRAWINGS The disassembled perspective view which shows the secondary battery of embodiment. The disassembled perspective view which shows the component of an electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS The top view which shows the positive electrode of embodiment, and a negative electrode.
  • A) is a top view which shows the state which cut
  • (b) is a top view which shows the state which cuts the electrode material of a negative electrode.
  • BRIEF DESCRIPTION OF THE DRAWINGS The side view which shows the positive electrode of embodiment, and a negative electrode.
  • the secondary battery 10 is provided with a metal case 11 forming an outer shell.
  • the case 11 includes a bottomed rectangular parallelepiped case main body 12 having an opening 12a on one side, and a lid 13 for closing the opening 12a.
  • the case 11 accommodates the electrode assembly 14 and an electrolytic solution (not shown) as an electrolyte.
  • the secondary battery 10 is a lithium ion battery.
  • the positive electrode 21 includes a positive electrode metal foil (in the present embodiment, an aluminum foil) 22 as a positive electrode current collector.
  • the positive metal foil 22 has one of a positive electrode main body 22a having a rectangular shape and one of the first positive electrode edge 22b which is one of the end edges along the pair of long sides of the positive electrode main body 22a.
  • a positive electrode tab 31 having a shape protruding from the portion.
  • the positive electrode 21 includes a positive electrode uncoated portion M along the first positive electrode edge 22 b of the positive electrode main portion 22 a.
  • the positive electrode uncoated portion M has a constant width along the direction in which the first positive electrode edge 22 b extends.
  • the positive electrode 21 has a positive electrode coated portion 23 present on both sides of the positive electrode main portion 22 a.
  • the positive electrode coating portion 23 is formed by applying a positive electrode active material mixture to the positive electrode main portion 22 a.
  • the positive electrode uncoated portion M is present in a portion where the positive electrode coated portion 23 does not exist in the positive electrode main portion 22 a.
  • the positive electrode uncoated portion M is a portion where the positive electrode active material mixture is not applied along the first positive electrode edge 22 b and the positive electrode main portion 22 a is exposed.
  • the positive electrode main body 22a has a second positive electrode edge 22c at an edge along the other long side which is the opposite side of the first positive electrode edge 22b, and the first positive electrode edge 22b and the second positive electrode
  • a third positive electrode edge 22d is provided at an edge along a pair of short sides connecting the edge 22c.
  • the direction in which the first positive electrode edge 22 b and the second positive electrode edge 22 c extend is taken as the width direction.
  • the positive electrode coated portion 23 has a first positive electrode coated edge portion 23 a at the edge closest to the positive electrode uncoated portion M in the height direction.
  • the positive electrode coating portion 23 has a second positive electrode coating edge 23b on the opposite side of the first positive electrode coating edge 23a, and the second positive electrode coating edge 23b is a second positive electrode of the positive electrode main portion 22a.
  • the second positive electrode coating edge 23b and the second positive electrode edge 22c are flush.
  • the positive electrode coating portion 23 has a third positive electrode coating edge portion 23c at a pair of edges connecting the first positive electrode coating edge portion 23a and the second positive electrode coating edge portion 23b.
  • Each third positive electrode coating edge 23c is along the third positive electrode edge 22d of the positive electrode main body 22a, and the third positive electrode coating edge 23c and the third positive electrode edge 22d are flush.
  • the first positive electrode coating edge 23a is positioned closer to the second positive electrode edge 22c than the first positive electrode edge 22b of the positive electrode main body 22a. For this reason, the positive electrode 21 includes the positive electrode uncoated portion M in a portion where the positive electrode main portion 22a is exposed along the first positive electrode edge 22b.
  • the dimension from the first positive electrode coating edge 23a to the second positive electrode coating edge 23b along the height direction is taken as the height H1 of the positive electrode coating portion 23. Further, in the positive electrode 21, the dimension from the first positive electrode coated edge 23a to the first positive electrode edge 22b along the height direction is taken as the height Hm of the positive electrode uncoated portion M.
  • the positive electrode uncoated portion M is manufactured aiming at a value set at design for the height Hm.
  • the actual size of the height Hm may deviate from the set value.
  • Many factors are based on the manufacture of the positive electrode 21, for example, a shift in coating of the active material mixture, and the cause of the active material mixture being separately coated on each side of the long metal foil 34. There is a gap, etc.
  • the height Hm of the positive electrode uncoated portion M is based on the assumed tolerance x with respect to the height Hm so that the positive electrode uncoated portion M is formed even if these deviations occur. Is also set large (tolerance x + ⁇ ).
  • the maximum value of the tolerance x assumed when various deviations occur in combination is often 1.0 mm. For this reason, in the present embodiment, the tolerance x is set to a maximum of 1.0 mm.
  • the set tolerance x As the set tolerance x is larger on the positive side, the first positive electrode edge 22b and the first positive electrode coated edge 23a are separated, and the value of the height Hm of the positive electrode uncoated portion M becomes larger, and the positive electrode uncoated Part M goes high.
  • the set tolerance x is larger on the negative side, the first positive electrode edge 22b and the first positive electrode coated edge 23a are closer, and the value of the height Hm of the positive electrode uncoated portion M is smaller. The coated part M is lowered.
  • the height Hm of the positive electrode uncoated portion M is set larger than the tolerance x and the value set larger than the tolerance x so that the positive electrode uncoated portion M can be secured even if the tolerance x changes. It is set in the range of 1 mm or less. And, the height Hm of the positive electrode uncoated portion M set in this way depends on the size of the tolerance x, but specifically, it is preferable to be set to 0.5 to 2.0 mm. More preferably, it is set to 8 to 1.2 mm. For example, when the height Hm of the positive electrode uncoated portion M is 1.2 mm, the positive electrode uncoated portion M can be secured even if the tolerance x is 1.0 mm at the maximum.
  • the height Hm of the positive electrode uncoated portion M when the height Hm of the positive electrode uncoated portion M is 0.8 to 1.2 mm, the height Hm of the positive electrode uncoated portion M can be made close to the tolerance 1.0 mm. In the present embodiment, in the positive electrode 21, the height Hm of the positive electrode uncoated portion M is set to 1.2 mm. The positive electrode uncoated portion M can be secured by setting the height Hm of the positive electrode uncoated portion M to be larger than the tolerance x in the range of 1 mm or less.
  • the positive electrode 21 is manufactured by punching (cutting) a long strip-shaped electrode material 33 with a punching die 36 as a cutting device.
  • the cutting device may be another cutting device such as a laser processing device.
  • the electrode material 33 is provided on both surfaces of the long metal foil 34 forming the positive electrode metal foil 22 of the positive electrode 21 and the long metal foil 34, and is coated with a positive electrode active material mixture forming the positive electrode coating portion 23. And a unit 35.
  • the positive electrode active material mixture is in the form of a paste in which a positive electrode active material, a conductive agent, and a binder are mixed.
  • the positive electrode active material mixture is not applied to both ends in the short direction of the long metal foil 34.
  • the dimension of the electrode material 33 in the short direction is twice the dimension of the positive electrode 21 from the tip of the positive electrode tab 31 to the second positive electrode edge 22 c.
  • the two positive electrodes 21 can be punched from the electrode material 33 in a state in which the height direction of the positive electrode 21 extends in the short direction of the electrode material 33.
  • the electrode material 33 may have a portion to which a positive electrode active material mixture is not applied only on one end side in the short direction. Then, the positive electrode coated portion 23 is formed from the coated portion 35, and the positive electrode tab 31 and the positive electrode uncoated portion M are formed from the portion of the long metal foil 34 where the coated portion 35 does not exist.
  • the positive electrode 21 provided with the positive electrode uncoated portion M a coating deviation or the like of the positive electrode active material mixture occurs at the time of its manufacture, and the positive electrode 21 is separated
  • the positive electrode uncoated portion M is formed while the active material mixture is applied to the positive electrode main portion 22a. Accordingly, when the positive electrode 21 is manufactured, the positive electrode active material mixture is prevented from being applied to the position to be the positive electrode tab 31, and the generation of the active material which does not contribute to the battery capacity is eliminated. Further, by setting the range to be larger than the tolerance x to 1 mm or less, it is regulated that the positive electrode uncoated portion M becomes larger than necessary.
  • the negative electrode 24 includes a sheet-like negative metal foil (in the present embodiment, copper foil) 25 as a negative electrode current collector.
  • the negative metal foil 25 includes a rectangular negative electrode main portion 25a and a negative electrode tab 32 having a shape protruding from a part of the first negative electrode edge 25b along the long side of the negative electrode main portion 25a.
  • the negative electrode 24 has a negative electrode coated portion 26 provided on both surfaces of the negative electrode main portion 25 a and a part (root) near the first negative electrode edge 25 b of the negative electrode tab 32.
  • the negative electrode coated portions 26 on both surfaces of the negative electrode main portion 25 a and the negative electrode tab 32 have the same planar shape and the same thickness.
  • the negative electrode body 25a has a second negative electrode edge 25c along the long side opposite to the first negative electrode edge 25b, and a pair of short sides connecting the first negative electrode edge 25b and the second negative electrode edge 25c. It has a third negative electrode edge 25d along.
  • the negative electrode coating portion 26 is provided with a tab side coating portion 29 in a portion existing at the root of the negative electrode tab 32.
  • the negative electrode coating portion 26 has a negative electrode tab coating edge portion 26 t.
  • the negative electrode tab coating edge 26 t is an edge extending in the width direction of the negative electrode tab 32, and is an edge near the tip of the negative electrode tab 32.
  • the negative electrode tab coating edge portion 26 t is located at one end in the height direction of the negative electrode coating portion 26 and is located on the first negative electrode edge portion 25 b side.
  • the negative electrode tab coating edge portion 26t corresponds to the negative electrode coating edge portion.
  • the tab side coating part 29 is a part which exists in the area
  • the negative electrode 24 is provided with the negative electrode uncoated portion N on the tip side of the negative electrode tab coated edge portion 26 t of the negative electrode tab 32.
  • the negative electrode uncoated portion N is present in the negative electrode tab 32 in a portion where the negative electrode coated portion 26 does not exist.
  • the negative electrode uncoated portion N is a portion where the negative electrode active material mixture is not applied along the negative electrode tab coating edge portion 26 t and the negative electrode metal foil 25 is exposed.
  • a direction in which a straight line L2 connecting the first negative electrode edge 25b and the second negative electrode edge 25c at the shortest distance is taken as the height direction.
  • the dimension of the tab side coating portion 29 in the height direction that is, the dimension from the first negative electrode edge 25 b in the height direction to the negative electrode tab coating edge 26 t is a height d.
  • the negative electrode coated portion 26, which is to form the negative electrode uncoated portion N is usually manufactured aiming at a value set at the design for the height d.
  • the actual size of the height d may deviate from the set value.
  • Many factors are based on the manufacture of the negative electrode 24, for example, a shift during coating of the active material mixture, a shift due to the active material mixture being separately applied to the negative electrode metal foil 25 on one side Etc.
  • the height d of the tab side coating portion 29 is set larger than the assumed tolerance y so that the tab side coating portion 29 is formed. (Tolerance y + ⁇ ).
  • the negative electrode tab coating edge portion 26 t and the first negative electrode coating edge portion 26 a are separated, and the value of the height d of the tab side coating portion 29 becomes larger.
  • the work section 29 becomes higher.
  • the negative electrode tab coating edge portion 26 t and the first negative electrode coating edge portion 26 a are closer, and the value of the height d of the tab side coating portion 29 becomes smaller.
  • the side coating portion 29 is lowered.
  • the tab side coating is performed so that the tab side coating portion 29 can be secured even if the tolerance y changes, that is, the first negative electrode coating edge portion 26a is positioned on the first negative electrode edge portion 25b.
  • the height d of the portion 29 is set larger than the tolerance y, and the value set larger than the tolerance y is set in the range of 1 mm or less.
  • the height d of the tab-side coating portion 29 set in this way depends on the size of the tolerance y, but specifically, it is preferably set to 0.5 to 2.0 mm. More preferably, it is set to 8 to 1.2 mm.
  • the tab side coating portion 29 can be secured even if the tolerance y is 1.0 mm at the maximum, and the first negative electrode coating edge portion 26 a Is located on the first negative electrode edge 25b.
  • the height d of the tab-side coating portion 29 is 0.8 to 1.2 mm
  • the height d of the tab-side coating portion 29 can be made close to the tolerance 1.0 mm.
  • the height d of the tab-side coating portion 29 is set to 1.2 mm.
  • the tab-side coating portion 29 can be secured by setting the height d of the tab-side coating portion 29 to be larger than the tolerance y within a range of 1 mm or less.
  • the negative electrode 24 is manufactured by punching (cutting) a long strip-shaped electrode material 33 with a punching die 36 as a cutting device.
  • the cutting device may be another cutting device such as a laser processing device.
  • the electrode material 33 is provided on both sides of the long metal foil 34 forming the negative electrode metal foil 25 of the negative electrode 24, and the negative electrode active material mixture which is provided on both sides of the long metal foil 34 and forms the negative electrode coated portion 26.
  • the negative electrode active material mixture is in the form of a paste in which a negative electrode active material, a conductive agent, and a binder are mixed.
  • the negative electrode active material mixture is not applied to both ends of the long metal foil 34 in the short direction.
  • the dimension of the electrode material 33 in the short direction is twice the dimension of the negative electrode 24 from the tip of the negative electrode tab 32 to the second negative electrode edge 25 c.
  • the two negative electrodes 24 can be punched from the electrode material 33 in a state where the height direction of the negative electrode 24 is aligned with the short direction of the electrode material 33.
  • the electrode material 33 may have a portion to which the negative electrode active material mixture is not applied only on one end side in the short direction. Then, the negative electrode coated portion 26 is formed from the coated portion 35, and the negative electrode tab 32 and the negative electrode uncoated portion N are formed from the portion of the long metal foil 34 where the coated portion 35 does not exist.
  • the negative electrode coating portion 26 has a second negative electrode coating edge 26b on the opposite side of the first negative electrode coating edge 26a, and the second negative electrode coating edge 26b is a second negative electrode edge of the negative electrode main portion 25a. It is provided along the part 25c.
  • the negative electrode coating portion 26 has a third negative electrode coating edge portion 26c at a pair of end edges connecting the first negative electrode coating edge portion 26a and the second negative electrode coating edge portion 26b.
  • the processing edge portion 26c is provided along the third negative electrode edge portion 25d of the negative electrode main portion 25a. Therefore, in the negative electrode 24, there is no uncoated portion where the negative electrode body 25a is exposed along the second negative electrode edge 25c and the third negative electrode edge 25d, and all four sides of the negative electrode body 25a are uncoated. There is no work department.
  • the electrode assembly 14 has the positive electrode 21 and the negative electrode 24 stacked in the front-rear direction (thickness direction) with the separator 27 sandwiched between the positive electrode 21 and the negative electrode 24. It is formed.
  • the positive electrodes 21 are stacked such that the positive tabs 31 are arranged in a row along the stacking direction.
  • Each positive electrode tab 31 in the stacked state is bent from the base end side near the first positive electrode edge 22 b, and the direction from the bent portion toward the tip is the stacking direction.
  • the negative electrodes 24 are stacked such that the negative tabs 32 are arranged in a row along the stacking direction so as not to overlap with the positive tabs 31.
  • the respective negative electrode tabs 32 in the laminated state are bent from the base end side closer to the first negative electrode edge 25b, and the direction from the bent portion toward the tip is the laminating direction.
  • the positive electrode tab 31 and the negative electrode tab 32 project in the same direction from the same end face of the electrode assembly 14 in the positive electrode 21 and the negative electrode 24. And the positive electrode tab 31 of each positive electrode 21 is electrically connected with the positive electrode terminal 15, as shown in FIG. Similarly, as shown in FIG. 1, the negative electrode tab 32 of each negative electrode 24 is electrically connected to the negative electrode terminal 16.
  • the electrode assembly 14 needs to be stacked on the entire surface of the positive electrode coating unit 23 so that the negative electrode coating unit 26 faces the separator 27. For this reason, the coated portion height H2 in the negative electrode coated portion 26 is set larger than the height H1 of the positive electrode coated portion 23.
  • the positive electrode 21 and the negative electrode 24 are stacked such that the first negative electrode coating edge 26 a is positioned above the first positive electrode coating edge 23 a in the height direction. That is, the first negative electrode coating edge portion 26a is located beyond the first positive electrode coating edge portion 23a along the direction in which the negative electrode tab 32 protrudes from the first negative electrode edge portion 25b.
  • the positive electrode 21 and the negative electrode 24 are stacked such that the first negative electrode edge 25 b is positioned above the first positive electrode edge 22 b. That is, the first negative electrode edge 25 b is located beyond the first positive electrode edge 22 b in the direction in which the negative electrode tab 32 protrudes from the first negative electrode edge 25 b.
  • the positive electrode 21 and the negative electrode 24 are stacked such that the second negative electrode coating edge 26b is positioned lower than the second positive electrode coating edge 23b in the height direction.
  • the positive electrode 21 and the negative electrode 24 are stacked such that the second negative electrode edge 25 c is positioned below the second positive electrode edge 22 c.
  • the height Hm of the positive electrode uncoated portion M is set to be larger than the assumed tolerance x, and set to be larger than the tolerance x in a range of 1 mm or less. Therefore, for example, as shown by the two-dot chain line in FIG. 3, even if the position of the first positive electrode coating edge 23a is shifted toward the first positive electrode edge 22b by the tolerance x, the first positive electrode coating edge 23a is located at a position indicated by a two-dot chain line T1, the positive electrode uncoated portion M is secured, and the positive electrode 21 provided with the positive electrode uncoated portion M can be provided without the influence of the tolerance x.
  • the positive electrode 21 when manufacturing the positive electrode 21 by cutting the electrode material 33, only the long metal foil 34 (positive metal foil 22) is cut along the first positive electrode edge 22b.
  • the long metal foil 34 is cut at a location along the first positive electrode edge 22b, or the coated portion 35 (the positive electrode coated portion 23) is long.
  • the positive electrode 21 can be manufactured under the same cutting conditions, and the variation in quality of the positive electrode 21 can be suppressed.
  • the positive electrode uncoated portion M can be secured to the positive electrode 21 and a shift occurs during application of the positive electrode active material mixture, the positive electrode active material mixture is coated on the positive electrode uncoated portion M, and the positive electrode tab 31 The formation of the positive electrode coating portion 23 can be avoided, and the generation of an active material that does not contribute to the battery capacity can be eliminated.
  • the height Hm of the positive electrode uncoated portion M is preferably set to 0.5 to 2.0 mm, and more preferably set to 0.8 to 1.2 mm. If comprised in this way, height Hm of the positive electrode uncoated part M can be made close to tolerance 1.0 mm, ensuring the positive electrode uncoated part M.
  • the height d of the tab side coating portion 29 of the negative electrode 24 is set to be larger than the assumed tolerance y, and set to be larger than the tolerance y in a range of 1 mm or less. Therefore, for example, as shown by a two-dot chain line in FIG. 3, even if the position of the negative electrode tab coating edge 26t is shifted toward the first negative electrode coating edge 26a by the tolerance y, the negative electrode tab coating edge 26t is located at a position indicated by a two-dot chain line T2, the tab side coating portion 29 is secured, and the negative electrode in which the first negative electrode coating edge 26a is positioned on the first negative electrode edge 25b without the influence of the tolerance y.
  • An electrode 24 can be provided.
  • the long metal foil 34 (the negative metal foil 25) and the coated portion 35 (the negative coated portion 26) are provided along the first negative electrode edge 25b. ) Cutting.
  • the negative electrode 24 can be manufactured under the same cutting conditions, and variations in the quality of the negative electrode 24 can be suppressed.
  • the height d of the tab side coating portion 29 is preferably set to 0.5 to 2.0 mm, and more preferably set to 0.8 to 1.2 mm. With this configuration, the height d of the tab side coating portion 29 can be made close to the tolerance 1.0 mm while securing the tab side coating portion 29.
  • the first negative electrode edge 25b is located above the first positive electrode edge 22b in the height direction, and the negative electrode tab coating edge 26t is located higher than the first positive electrode coating edge 23a in the height direction. For this reason, in the electrode assembly 14, even if a shift occurs in the height direction, the state in which the negative electrode coated portion 26 is opposed to the entire surface of the positive electrode coated portion 23 can be maintained.
  • the positive electrode tab 31 is bent from the base end side near the first positive electrode edge 22 b.
  • the upper limit is defined while the height Hm of the positive electrode uncoated portion M is larger than the tolerance x. For this reason, it is suppressed that the height Hm of the positive electrode uncoated portion M becomes too large, and the shortening of the protrusion length of the positive electrode tab 31 from the first positive electrode edge portion 22b is suppressed.
  • the protrusion length of the positive electrode tab 31 from the first positive electrode edge 22b becoming short, the stress generated at the bent portion of the positive electrode tab 31 is suppressed, and a crack or the like is generated at the bent portion of the positive electrode tab 31 Makes it easier to
  • the negative electrode tab 32 is bent from the base end side near the first negative electrode edge 25 b.
  • the upper limit of the height d of the tab-side coating portion 29 on the negative electrode tab 32 is defined while being larger than the tolerance y. Therefore, the height d of the tab-side coating portion 29 is prevented from becoming too large, the tab-side coating portion 29 on the negative electrode tab 32 is reduced, and the stress generated in the bent portion is suppressed. It becomes easy to control the falling off of the active material from the upper tab side coating portion 29.
  • the present embodiment may be modified as follows.
  • the tab-side coating portion 29 may not be provided, and in this case, the first negative electrode coating edge 26a may be located on the first negative electrode edge 25b. You may be located near the 2nd negative electrode edge 25c rather than the negative electrode edge 25b.
  • the positive electrode uncoated portion M may not be present, and in this case, the first positive electrode coated edge 23a may be located on the first positive electrode edge 22b, or the positive electrode tab It may be located on 31.
  • the secondary battery 10 is a lithium ion secondary battery, but is not limited to this, and may be another secondary battery. In short, it is sufficient that the ions move between the positive electrode active material and the negative electrode active material and transfer and receive electric charges.
  • the positive electrode current collector is embodied in the positive electrode metal foil 22 and the negative electrode current collector is embodied in the negative electrode metal foil 25, the current collector may be a sheet other than the metal foil as long as the coated portion can be held. .
  • the present invention may be embodied in a storage device such as an electric double layer capacitor.

Abstract

An energy storage device includes an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked with each insulated from one another. The positive electrode has a positive-electrode coated area formed by applying a positive-electrode active material to the surface of a positive electrode body, and a positive-electrode uncoated area to which the positive-electrode active material is not applied with the positive electrode body exposed. The height Hm of the positive-electrode uncoated area in the positive electrode is greater than a tolerance x for the positive-electrode uncoated area and the range where the height Hm is greater than the tolerance x is 1.0 mm or less.

Description

蓄電装置Power storage device
　本発明は、蓄電装置に関する。 The present invention relates to a power storage device.
　従来から、蓄電装置の一種である二次電池としては、リチウムイオン二次電池や、ニッケル水素二次電池などが知られている。例えば、リチウムイオン二次電池では、シート状の正極電極及び負極電極を積層した電極組立体を備える。 BACKGROUND ART Conventionally, lithium ion secondary batteries, nickel hydrogen secondary batteries and the like have been known as secondary batteries that are a type of power storage device. For example, a lithium ion secondary battery includes an electrode assembly in which a sheet-like positive electrode and a negative electrode are stacked.
　例えば特許文献１に記載されるように、正極電極は、矩形シート状の正極金属箔と、正極金属箔の両面に存在する正極塗工部とを備える。また、正極電極は、正極金属箔のうち正極塗工部の存在しない箇所に、金属箔の露出した未塗工部を備える。負極電極は、矩形シート状の負極金属箔と、負極金属箔の両面全面及び負極タブの根本両面にも存在する負極塗工部とを備える。 For example, as described in Patent Document 1, the positive electrode includes a rectangular sheet-like positive metal foil and a positive electrode coated portion present on both sides of the positive metal foil. In addition, the positive electrode is provided with an exposed uncoated portion of the metal foil at a portion where the positive electrode coated portion does not exist in the positive electrode metal foil. The negative electrode includes a rectangular sheet-like negative electrode metal foil, and a negative electrode coated portion which is also present on both surfaces of the negative electrode metal foil and on both sides of the base of the negative electrode tab.
　正極電極及び負極電極は、活物質粒子、導電剤、及びバインダを混合したペースト状の活物質合剤を予め打ち抜き加工した金属箔の表面に塗布して製造される、又は帯状をなす金属箔の表面に活物質合剤を塗布して電極用の材料を製造した後、その材料を正極電極又は負極電極の形状に打ち抜き加工して製造される。 The positive electrode and the negative electrode are manufactured by applying a paste-like active material mixture, which is a mixture of active material particles, a conductive agent, and a binder, onto a surface of a metal foil previously punched out, or in the form of a strip. After the active material mixture is applied to the surface to produce a material for an electrode, the material is punched into the shape of a positive electrode or a negative electrode to produce a material.
　ところで、活物質合剤を金属箔に塗布した際、活物質合剤の塗工部を常に一定の範囲で形成することが困難であり、塗工部の高さ方向への寸法にずれが生じることが通常である。そこで、特許文献１では、正極電極において、活物質合剤を塗布する際のずれが生じたとしても、未塗工部へ活物質合剤がはみ出すことにより、活物質合剤が無駄になることを抑制している。また、負極電極においては、負極塗工部を正極タブに積層方向に対向させる必要をなくしつつ、正極塗工部に負極塗工部を対向させるために、負極タブの根本まで負極塗工部を形成することで、負極金属箔における負極タブの突出した縁まで負極塗工部が形成されるようにしている。 By the way, when the active material mixture is applied to a metal foil, it is difficult to always form the coated portion of the active material mixture in a certain range, and the dimension in the height direction of the coated portion is deviated That is normal. Therefore, in Patent Document 1, even if a deviation occurs when applying the active material mixture in the positive electrode, the active material mixture is wasted due to the active material mixture protruding to the uncoated portion. To suppress. In addition, in the negative electrode, the negative electrode coated portion is extended to the root of the negative electrode tab so that the negative electrode coated portion is opposed to the positive electrode coated portion while eliminating the need for the negative electrode coated portion to face the positive electrode tab in the laminating direction. By forming, the negative electrode coated portion is formed up to the protruding edge of the negative electrode tab in the negative electrode metal foil.
特開２０１３－１７５４０７号公報JP, 2013-175407, A
　ところが、帯状をなす金属箔の表面に活物質合剤を塗布して電極用の材料を形成した後、その材料を打ち抜き加工して正極電極又は負極電極を製造する場合において、活物質合剤の塗布時のずれ等を原因として、正極電極に未塗工部が形成できなかったり、負極タブの根本にまで負極塗工部を形成できない虞がある。すると、正極電極の製造のための打ち抜き加工時には、未塗工部の形成された材料を打ち抜いたり、未塗工部の形成されていない材料を打ち抜いたりすることとなり、同条件での材料の打ち抜きが行えなくなり、正極電極の品質がばらつく虞がある。同様に、負極電極の打ち抜き加工時には、負極タブとなる位置まで活物質合剤の塗布された材料を打ち抜いたり、負極タブとなる位置まで活物質合剤の塗布されていない材料を打ち抜いたりすることとなり、同条件での材料の打ち抜きが行えなくなり、負極電極の品質がばらつく虞がある。 However, when an active material mixture is applied to the surface of a strip-shaped metal foil to form a material for an electrode, the material is punched out to produce a positive electrode or a negative electrode. There is a possibility that an uncoated portion can not be formed on the positive electrode or that the negative electrode coated portion can not be formed even at the root of the negative electrode tab due to a deviation at the time of application or the like. Then, at the time of punching for manufacturing the positive electrode, the material with the uncoated portion formed is punched out, or the material without the uncoated portion formed is punched out, and the material punching under the same conditions is performed. There is a risk that the quality of the positive electrode may vary. Similarly, at the time of punching out the negative electrode, the material to which the active material mixture is applied is punched to the position to become the negative electrode tab, or the material to which the active material mixture is not applied is punched to the position to become the negative electrode tab. Therefore, the material can not be punched out under the same conditions, and the quality of the negative electrode may vary.
　本発明の目的は、品質のばらつきを抑制できる蓄電装置を提供することにある。 An object of the present invention is to provide a power storage device capable of suppressing variation in quality.
　上記問題点を解決するための蓄電装置は、複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部と、前記第１正極縁部に沿って正極活物質合剤が塗布されず前記正極本体部の露出した正極未塗工部とを備え、前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とした場合、前記高さ方向への前記正極塗工縁部から前記第１正極縁部までの寸法である前記正極未塗工部の高さは、前記正極未塗工部の高さに設定された公差より大きく、当該公差より大きくする範囲は１．０ｍｍ以下であり、前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、前記負極塗工縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあることを要旨とする。 A storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is The positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coating portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, the surface of the positive electrode main body portion being coated with a positive electrode active material mixture; The positive electrode uncoated portion where the positive electrode active material mixture is not applied along the positive electrode edge and the exposed positive electrode main body is exposed, and the first positive electrode edge and the second positive electrode edge for the positive electrode Height direction of the positive electrode coated portion, where the extending direction of the straight line connecting the When the edge located at one end and on the side of the first positive electrode edge is a positive electrode coating edge, the dimension from the positive electrode coating edge to the first positive electrode edge in the height direction The height of the positive electrode uncoated portion is larger than the tolerance set to the height of the positive electrode uncoated portion, the range of larger than the tolerance is 1.0 mm or less, and the negative electrode is a negative electrode current collector Body, the negative electrode current collector includes a rectangular negative electrode main body, and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body, and the negative electrode main body A negative electrode coated portion having a second negative electrode edge portion opposite to the first negative electrode edge portion, and formed by applying a negative electrode active material mixture on the surface of the negative electrode main body, When the extending direction of the straight line connecting the first negative electrode edge and the second negative electrode edge at the shortest distance is the height direction When the edge portion on the first negative electrode edge portion side is located at one end in the height direction of the negative electrode coating portion and is the negative electrode coating edge portion, the negative electrode coating edge portion extends along the height direction. The gist is that the negative electrode tab is located beyond the positive electrode coating edge along a direction in which the negative electrode tab protrudes from the first negative electrode edge.
　これによれば、正極電極の製造時、正極金属箔に活物質合剤を塗布した際、正極未塗工部となる部位に活物質合剤がはみ出して、正極未塗工部の高さが公差だけずれたとしても、正極金属箔には活物質合剤の塗布されていない領域が確保され、正極未塗工部が形成される。よって、活物質合剤の塗布された正極金属箔を切断して正極電極を製造する際、第１正極縁部に沿う箇所については正極金属箔のみの切断となる。その結果、例えば、正極電極を製造する際、第１正極縁部に沿う箇所について、正極金属箔のみの切断があったり、正極塗工部と正極金属箔の積層構造の切断があったりというように、切断条件がばらつくことを無くし、同じ切断条件で正極電極の製造を行うことを可能にして、正極電極の品質のバラツキを抑制できる。 According to this, at the time of manufacturing the positive electrode, when the active material mixture is applied to the positive electrode metal foil, the active material mixture protrudes to the part to be the positive electrode uncoated portion, and the height of the positive electrode uncoated portion is Even if the tolerance is deviated, a region to which the active material mixture is not applied is secured in the positive electrode metal foil, and a positive electrode uncoated portion is formed. Therefore, when manufacturing the positive electrode by cutting the positive electrode metal foil coated with the active material mixture, only the positive electrode metal foil is cut at a location along the first positive electrode edge. As a result, for example, when manufacturing the positive electrode, there is cutting of only the positive electrode metal foil at a location along the first positive electrode edge, or cutting of a laminated structure of the positive electrode coated portion and the positive electrode metal foil In addition, it is possible to eliminate variations in cutting conditions and to manufacture the positive electrode under the same cutting conditions, and to suppress variations in quality of the positive electrode.
　上記問題点を解決するための蓄電装置は、複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部と、前記第１正極縁部に沿って正極活物質合剤が塗布されず前記正極本体部の露出した正極未塗工部とを備え、前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とした場合、前記高さ方向への前記正極塗工縁部から前記第１正極縁部までの寸法である前記正極未塗工部の高さは０．５～２．０ｍｍであり、前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、前記負極塗工縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあることを要旨とする。 A storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is The positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coating portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, the surface of the positive electrode main body portion being coated with a positive electrode active material mixture; The positive electrode uncoated portion where the positive electrode active material mixture is not applied along the positive electrode edge and the exposed positive electrode main body is exposed, and the first positive electrode edge and the second positive electrode edge for the positive electrode Height direction of the positive electrode coated portion, where the extending direction of the straight line connecting the When the edge located at one end and on the side of the first positive electrode edge is a positive electrode coating edge, the dimension from the positive electrode coating edge to the first positive electrode edge in the height direction The height of the uncoated portion of the positive electrode is 0.5 to 2.0 mm, and the negative electrode includes a negative electrode current collector, and the negative electrode current collector has a rectangular negative electrode main body, and the negative electrode main body A negative electrode tab having a shape protruding from a part of the first negative electrode edge of the part, and having a second negative electrode edge which is opposite to the first negative electrode edge of the negative electrode body, A negative electrode coated portion formed by applying a negative electrode active material mixture on the surface of the portion, and for the negative electrode, a straight line connecting the first negative electrode edge portion and the second negative electrode edge portion at the shortest distance When the direction is a height direction, the negative electrode coating portion is located at one end in the height direction of the negative electrode coating portion, and the edge portion on the first negative electrode edge portion side is coated In the case of the edge portion, the negative electrode coating edge is located beyond the positive electrode coating edge along the direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction. Make it a gist.
　これによれば、正極電極の製造時、正極金属箔に活物質合剤を塗布した際、正極未塗工部となる部位に活物質合剤がはみ出して、正極未塗工部の高さが公差だけずれたとしても、正極金属箔には活物質合剤の塗布されていない領域が確保され、正極未塗工部が形成される。よって、活物質合剤の塗布された正極金属箔を切断して正極電極を製造する際、第１正極縁部に沿う箇所については正極金属箔のみの切断となる。その結果、例えば、正極電極を製造する際、第１正極縁部に沿う箇所について、正極金属箔のみの切断があったり、正極塗工部と正極金属箔の積層構造の切断であったりというように、切断条件がばらつくことを無くし、同じ切断条件で正極電極の製造を行うことを可能にして、正極電極の品質のバラツキを抑制できる。 According to this, at the time of manufacturing the positive electrode, when the active material mixture is applied to the positive electrode metal foil, the active material mixture protrudes to the part to be the positive electrode uncoated portion, and the height of the positive electrode uncoated portion is Even if the tolerance is deviated, a region to which the active material mixture is not applied is secured in the positive electrode metal foil, and a positive electrode uncoated portion is formed. Therefore, when manufacturing the positive electrode by cutting the positive electrode metal foil coated with the active material mixture, only the positive electrode metal foil is cut at a location along the first positive electrode edge. As a result, for example, when manufacturing the positive electrode, only the positive electrode metal foil is cut at a location along the first positive electrode edge, or the laminated structure of the positive electrode coated portion and the positive electrode metal foil is cut. In addition, it is possible to eliminate variations in cutting conditions and to manufacture the positive electrode under the same cutting conditions, and to suppress variations in quality of the positive electrode.
　また、蓄電装置について、前記正極タブは、前記第１正極縁部寄りの基端側から折り曲げられている。
　これによれば、正極未塗工部の高さについて、公差より大きくしつつも上限を規定している。このため、正極未塗工部の高さが大きくなりすぎることを抑制し、第１正極縁部からの正極タブの突出長さが短くなることを抑制している。その結果、第１正極縁部からの正極タブの突出長さが短くなることで折り曲げ部に発生する応力が大きくなることを抑止して、正極タブの折り曲げ部に亀裂等が入ることを抑制しやすくなる。 Further, in the power storage device, the positive electrode tab is bent from the base end side closer to the first positive electrode edge portion.
According to this, with respect to the height of the uncoated portion of the positive electrode, the upper limit is defined while being larger than the tolerance. For this reason, it is suppressed that the height of a positive electrode uncoated part becomes large too much, and it is suppressing that the protrusion length of the positive electrode tab from a 1st positive electrode edge part becomes short. As a result, by shortening the protrusion length of the positive electrode tab from the first positive electrode edge, it is suppressed that the stress generated in the bent portion becomes large, and it is suppressed that a crack or the like is formed in the bent portion of the positive electrode tab. It will be easier.
　上記問題点を解決するための蓄電装置は、複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部を備え、前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とし、前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、前記負極塗工縁部は、前記負極タブ上にあり、かつ前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあり、前記高さ方向への前記第１負極縁部から前記負極塗工縁部までの高さは、当該高さに設定された公差より大きく、当該公差より大きくする範囲は１．０ｍｍ以下であることを要旨とする。 A storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is The positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coated portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, and having a surface of the positive electrode main body portion coated with a positive electrode active material mixture, When the direction in which the straight line connecting the first positive electrode edge and the second positive electrode edge is the shortest distance is the height direction, the electrode is located at one end in the height direction of the positive electrode coated portion, and The edge portion on the first positive electrode edge portion side is a positive electrode coated edge portion, and the negative electrode is a negative electrode current collector. The negative electrode current collector includes a rectangular negative electrode main body and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body, and 1 A negative electrode coated portion having a second negative electrode edge portion opposite to the negative electrode edge portion, and formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion; (1) When the extending direction of the straight line connecting the negative electrode edge and the second negative electrode edge at the shortest distance is the height direction, the first negative electrode edge is located at one end in the height direction of the negative electrode coated portion When the side edge is a negative electrode coating edge, the negative electrode coating edge is on the negative electrode tab, and the negative electrode tab protrudes from the first negative electrode edge along the height direction. From the first negative electrode edge in the height direction, the negative electrode being located along the direction beyond the positive electrode coating edge Height to coating edge is greater than the set at a height tolerance range greater than the tolerance shall be summarized in that it is 1.0mm or less.
　これによれば、負極電極の製造時、負極金属箔に活物質合剤を塗布した際、負極タブ上において、公差だけ負極塗工縁部の位置が第１負極塗工縁部側にずれたとしても、負極塗工縁部は負極タブ上に位置するため、負極塗工部を第１負極縁部上に位置させることができる。よって、活物質合剤の塗布された負極金属箔を切断して負極電極を製造する際、第１負極縁部に沿う箇所については負極金属箔と負極塗工部の積層構造の切断となる。その結果、例えば、負極電極を製造する際、第１負極縁部に沿う箇所について、負極金属箔のみの切断があったり、負極塗工部と負極金属箔の積層構造の切断があったりというように、切断条件がばらつくことを無くし、同じ切断条件で負極電極の製造を行うことを可能にして、負極電極の品質のバラツキを抑制できる。また、正極塗工部の全面を負極塗工部に対向させることができる。 According to this, at the time of manufacturing the negative electrode, when the active material mixture is applied to the negative electrode metal foil, the position of the negative electrode coating edge is shifted to the first negative electrode coating edge side by the tolerance on the negative electrode tab Also, since the negative electrode coating edge is located on the negative electrode tab, the negative electrode coating portion can be located on the first negative electrode edge. Therefore, when manufacturing the negative electrode by cutting the negative electrode metal foil to which the active material mixture is applied, the laminated structure of the negative electrode metal foil and the negative electrode coated portion is cut along the first negative electrode edge. As a result, for example, when manufacturing the negative electrode, there is cutting of only the negative metal foil at a location along the first negative electrode edge, or cutting of the laminated structure of the negative electrode coated portion and the negative metal foil. In addition, variations in cutting conditions are eliminated, and manufacturing of the negative electrode can be performed under the same cutting conditions, so that variations in quality of the negative electrode can be suppressed. Moreover, the whole surface of a positive electrode coating part can be made to oppose a negative electrode coating part.
　上記問題点を解決するための蓄電装置は、複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部を備え、前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とし、前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、前記負極塗工縁部は、前記負極タブ上にあり、かつ前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあり、前記高さ方向への前記第１負極縁部から前記負極塗工縁部までの高さは０．５～２．０ｍｍであることを要旨とする。 A storage device for solving the above problems is a storage device having an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being mutually insulated, and the positive electrode is The positive electrode current collector includes a rectangular positive electrode main body and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body, and the positive electrode A positive electrode coated portion having a second positive electrode edge portion opposite to the first positive electrode edge portion of the main body portion, and having a surface of the positive electrode main body portion coated with a positive electrode active material mixture, When the direction in which the straight line connecting the first positive electrode edge and the second positive electrode edge is the shortest distance is the height direction, the electrode is located at one end in the height direction of the positive electrode coated portion, and The edge portion on the first positive electrode edge portion side is a positive electrode coated edge portion, and the negative electrode is a negative electrode current collector. The negative electrode current collector includes a rectangular negative electrode main body and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body, and 1 A negative electrode coated portion having a second negative electrode edge portion opposite to the negative electrode edge portion, and formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion; (1) When the extending direction of the straight line connecting the negative electrode edge and the second negative electrode edge at the shortest distance is the height direction, the first negative electrode edge is located at one end in the height direction of the negative electrode coated portion When the side edge is a negative electrode coating edge, the negative electrode coating edge is on the negative electrode tab, and the negative electrode tab protrudes from the first negative electrode edge along the height direction. From the first negative electrode edge in the height direction, the negative electrode being located along the direction beyond the positive electrode coating edge Height to coating edge is summarized in that a 0.5 ~ 2.0 mm.
　これによれば、負極金属箔に活物質合剤を塗布した際、負極タブ上において、公差だけ負極塗工縁部の位置が第１負極塗工縁部側にずれたとしても、負極塗工縁部は負極タブ上に位置するため、公差の影響なく、負極塗工部を第１負極縁部上に位置させることができる。よって、活物質合剤の塗布された負極金属箔を切断して負極電極を製造する際、第１負極縁部に沿う箇所については負極金属箔と負極塗工部の切断となる。その結果、例えば、負極電極を製造する際、第１負極縁部に沿う箇所について、負極金属箔のみの切断があったり、負極塗工部と負正極金属箔の積層構造の切断があったりするというように切断条件がばらつくことを無くし、同じ切断条件で負極電極の製造を行うことを可能にして、負極電極の品質のバラツキを抑制できる。また、正極塗工部の全面を負極塗工部に対向させることができる。 According to this, when the active material mixture is applied to the negative electrode metal foil, even if the position of the negative electrode coating edge deviates to the first negative electrode coating edge side by the tolerance on the negative electrode tab, the negative electrode coating Since the edge is located on the negative electrode tab, the negative electrode coated portion can be located on the first negative electrode edge without the effect of tolerance. Therefore, when manufacturing the negative electrode by cutting the negative electrode metal foil to which the active material mixture is applied, the negative electrode metal foil and the negative electrode coated portion are cut along the first negative electrode edge. As a result, for example, when manufacturing the negative electrode, there is cutting of only the negative metal foil at a location along the first negative electrode edge, or cutting of the laminated structure of the negative electrode coated portion and the negative positive metal foil. Thus, variations in cutting conditions are eliminated, and manufacturing of the negative electrode can be performed under the same cutting conditions, so that variations in quality of the negative electrode can be suppressed. Moreover, the whole surface of a positive electrode coating part can be made to oppose a negative electrode coating part.
　また、蓄電装置について、前記負極タブは、前記第１負極縁部寄りの基端側から折り曲げられている。
　これによれば、負極タブ上での負極塗工縁部の高さについて、公差より大きくしつつも上限を規定している。このため、負極塗工縁部の高さが大きくなりすぎることを抑制し、負極タブ上に存在する負極塗工部を少なくし、折り曲げ部に発生する応力を抑え、負極タブ上の負極塗工部からの活物質の脱落を抑制しやすくなる。 In addition, in the power storage device, the negative electrode tab is bent from a base end side closer to the first negative electrode edge portion.
According to this, with respect to the height of the negative electrode coated edge on the negative electrode tab, the upper limit is defined while making it larger than the tolerance. For this reason, the height of the negative electrode coating edge is prevented from becoming too large, the negative electrode coated portion existing on the negative electrode tab is reduced, the stress generated in the bent portion is suppressed, and the negative electrode coating on the negative electrode tab It becomes easy to control the falling off of the active material from the department.
　また、蓄電装置について、前記正極電極は、前記第１正極縁部に沿って正極活物質合剤が塗布されず前記正極本体部の露出した正極未塗工部を備えるとともに、前記負極電極は、前記負極塗工縁部を前記負極タブ上に備え、前記電極組立体において前記負極塗工縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあり、前記第１負極縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記第１正極縁部を越えた位置にある。 In the power storage device, the positive electrode includes a positive uncoated portion in which the positive electrode active material mixture is not applied along the first positive electrode edge and the positive electrode main body is exposed, and the negative electrode is The negative electrode coating edge is provided on the negative electrode tab, and in the electrode assembly, the negative electrode coating edge is along the direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction. Of the first negative electrode edge portion along the height direction, the first negative electrode edge portion extending along the direction in which the negative electrode tab protrudes from the first negative electrode edge portion. It is located beyond the edge.
　これによれば、電極組立体において、高さ方向にずれが生じたとしても、正極塗工部の全面に負極塗工部を対向させた状態を維持できる。
　前記蓄電装置は二次電池である。 According to this, even if a shift occurs in the height direction in the electrode assembly, it is possible to maintain the state in which the negative electrode coated portion is opposed to the entire surface of the positive electrode coated portion.
The power storage device is a secondary battery.
　本発明によれば、品質のばらつきを抑制できる。 According to the present invention, variations in quality can be suppressed.
実施形態の二次電池を示す分解斜視図。BRIEF DESCRIPTION OF THE DRAWINGS The disassembled perspective view which shows the secondary battery of embodiment. 電極組立体の構成要素を示す分解斜視図。The disassembled perspective view which shows the component of an electrode assembly. 実施形態の正極電極と負極電極を示す平面図。BRIEF DESCRIPTION OF THE DRAWINGS The top view which shows the positive electrode of embodiment, and a negative electrode. （ａ）は正極電極の電極材料を切断する状態を示す平面図、（ｂ）は負極電極の電極材料を切断する状態を示す平面図。(A) is a top view which shows the state which cut | disconnects the electrode material of a positive electrode, (b) is a top view which shows the state which cuts the electrode material of a negative electrode. 実施形態の正極電極と負極電極を示す側面図。BRIEF DESCRIPTION OF THE DRAWINGS The side view which shows the positive electrode of embodiment, and a negative electrode.
　以下、蓄電装置を二次電池に具体化した一実施形態を図１～図５にしたがって説明する。
　図１に示すように、二次電池１０は、外郭を構成する金属製のケース１１を備えている。ケース１１は、一面に開口部１２ａを備える有底直方体状のケース本体１２と、開口部１２ａを塞ぐ蓋体１３とを備えている。ケース１１には、電極組立体１４及び電解質としての電解液（図示略）が収容されている。二次電池１０はリチウムイオン電池である。 Hereinafter, an embodiment in which the power storage device is embodied in a secondary battery will be described according to FIGS. 1 to 5.
As shown in FIG. 1, the secondary battery 10 is provided with a metal case 11 forming an outer shell. The case 11 includes a bottomed rectangular parallelepiped case main body 12 having an opening 12a on one side, and a lid 13 for closing the opening 12a. The case 11 accommodates the electrode assembly 14 and an electrolytic solution (not shown) as an electrolyte. The secondary battery 10 is a lithium ion battery.
　図１又は図２に示すように、電極組立体１４は、複数の正極電極２１と、複数の負極電極２４とが、両者の間に樹脂製のセパレータ２７が介在する状態で交互に積層された積層型の構成である。正極電極２１は、正極集電体としての正極金属箔（本実施形態ではアルミニウム箔）２２を備える。積層方向から見て、正極金属箔２２は矩形状の正極本体部２２ａと、正極本体部２２ａの一対の長辺に沿う端縁のうちの一方の端縁となる第１正極縁部２２ｂの一部から突出した形状の正極タブ３１と、を備える。 As shown in FIG. 1 or 2, in the electrode assembly 14, a plurality of positive electrodes 21 and a plurality of negative electrodes 24 are alternately stacked in a state in which a resin separator 27 is interposed therebetween. It has a stacked structure. The positive electrode 21 includes a positive electrode metal foil (in the present embodiment, an aluminum foil) 22 as a positive electrode current collector. When viewed from the stacking direction, the positive metal foil 22 has one of a positive electrode main body 22a having a rectangular shape and one of the first positive electrode edge 22b which is one of the end edges along the pair of long sides of the positive electrode main body 22a. And a positive electrode tab 31 having a shape protruding from the portion.
　正極電極２１は、正極本体部２２ａの第１正極縁部２２ｂに沿って正極未塗工部Ｍを備える。正極未塗工部Ｍは、第１正極縁部２２ｂの延びる方向に沿って一定幅を有する。正極電極２１は、正極本体部２２ａの両面に存在する正極塗工部２３を有する。正極塗工部２３は、正極活物質合剤を正極本体部２２ａに塗布して形成されている。正極未塗工部Ｍは、正極本体部２２ａにおいて、正極塗工部２３の存在しない部分に存在する。正極未塗工部Ｍは、第１正極縁部２２ｂに沿って正極活物質合剤が塗布されず正極本体部２２ａの露出した部分である。 The positive electrode 21 includes a positive electrode uncoated portion M along the first positive electrode edge 22 b of the positive electrode main portion 22 a. The positive electrode uncoated portion M has a constant width along the direction in which the first positive electrode edge 22 b extends. The positive electrode 21 has a positive electrode coated portion 23 present on both sides of the positive electrode main portion 22 a. The positive electrode coating portion 23 is formed by applying a positive electrode active material mixture to the positive electrode main portion 22 a. The positive electrode uncoated portion M is present in a portion where the positive electrode coated portion 23 does not exist in the positive electrode main portion 22 a. The positive electrode uncoated portion M is a portion where the positive electrode active material mixture is not applied along the first positive electrode edge 22 b and the positive electrode main portion 22 a is exposed.
　正極電極２１において、正極本体部２２ａは、第１正極縁部２２ｂの対辺となる他方の長辺に沿う端縁に第２正極縁部２２ｃを有し、第１正極縁部２２ｂと第２正極縁部２２ｃを繋ぐ一対の短辺に沿う端縁に第３正極縁部２２ｄを有する。 In the positive electrode 21, the positive electrode main body 22a has a second positive electrode edge 22c at an edge along the other long side which is the opposite side of the first positive electrode edge 22b, and the first positive electrode edge 22b and the second positive electrode A third positive electrode edge 22d is provided at an edge along a pair of short sides connecting the edge 22c.
　図３に示すように、積層方向から正極電極２１を見て、正極電極２１の面方向に沿って第１正極縁部２２ｂと第２正極縁部２２ｃとを最短距離で繋ぐ直線Ｌ１の延びる方向を高さ方向とする。また、第１正極縁部２２ｂ及び第２正極縁部２２ｃの延びる方向を幅方向とする。 As shown in FIG. 3, the direction of extension of a straight line L1 connecting the first positive electrode edge 22b and the second positive electrode edge 22c at the shortest distance along the surface direction of the positive electrode 21 as seen from the lamination direction. Is the height direction. In addition, the direction in which the first positive electrode edge 22 b and the second positive electrode edge 22 c extend is taken as the width direction.
　正極塗工部２３は、高さ方向において最も正極未塗工部Ｍに近い縁部に第１正極塗工縁部２３ａを有する。また、正極塗工部２３は、第１正極塗工縁部２３ａの対辺に第２正極塗工縁部２３ｂを有し、第２正極塗工縁部２３ｂは、正極本体部２２ａの第２正極縁部２２ｃに沿い、第２正極塗工縁部２３ｂと第２正極縁部２２ｃは面一である。 The positive electrode coated portion 23 has a first positive electrode coated edge portion 23 a at the edge closest to the positive electrode uncoated portion M in the height direction. The positive electrode coating portion 23 has a second positive electrode coating edge 23b on the opposite side of the first positive electrode coating edge 23a, and the second positive electrode coating edge 23b is a second positive electrode of the positive electrode main portion 22a. Along the edge 22c, the second positive electrode coating edge 23b and the second positive electrode edge 22c are flush.
　正極塗工部２３は、第１正極塗工縁部２３ａと第２正極塗工縁部２３ｂを繋ぐ一対の端縁に第３正極塗工縁部２３ｃを有する。各第３正極塗工縁部２３ｃは正極本体部２２ａの第３正極縁部２２ｄに沿い、第３正極塗工縁部２３ｃと第３正極縁部２２ｄは面一である。 The positive electrode coating portion 23 has a third positive electrode coating edge portion 23c at a pair of edges connecting the first positive electrode coating edge portion 23a and the second positive electrode coating edge portion 23b. Each third positive electrode coating edge 23c is along the third positive electrode edge 22d of the positive electrode main body 22a, and the third positive electrode coating edge 23c and the third positive electrode edge 22d are flush.
　第１正極塗工縁部２３ａは、正極本体部２２ａの第１正極縁部２２ｂよりも第２正極縁部２２ｃ寄りに位置する。このため、正極電極２１は、第１正極縁部２２ｂに沿って正極本体部２２ａが露出した部分に正極未塗工部Ｍを備える。 The first positive electrode coating edge 23a is positioned closer to the second positive electrode edge 22c than the first positive electrode edge 22b of the positive electrode main body 22a. For this reason, the positive electrode 21 includes the positive electrode uncoated portion M in a portion where the positive electrode main portion 22a is exposed along the first positive electrode edge 22b.
　正極電極２１において、高さ方向に沿う第１正極塗工縁部２３ａから第２正極塗工縁部２３ｂまでの寸法を正極塗工部２３の高さＨ１とする。また、正極電極２１において、高さ方向に沿う第１正極塗工縁部２３ａから第１正極縁部２２ｂまでの寸法を正極未塗工部Ｍの高さＨｍとする。 In the positive electrode 21, the dimension from the first positive electrode coating edge 23a to the second positive electrode coating edge 23b along the height direction is taken as the height H1 of the positive electrode coating portion 23. Further, in the positive electrode 21, the dimension from the first positive electrode coated edge 23a to the first positive electrode edge 22b along the height direction is taken as the height Hm of the positive electrode uncoated portion M.
　通常、正極電極２１において、正極未塗工部Ｍは、高さＨｍについて設計時に設定された値を狙って製造される。しかし、様々な要因により、高さＨｍの実寸が、設定された値からずれる場合がある。要因は、正極電極２１の製造に基づくものが多く、例えば活物質合剤の塗工時のずれ、活物質合剤が長尺金属箔３４に対し片面ずつ別々に塗布されることを原因としたずれ等がある。本実施形態では、これらのずれが生じたとしても、正極未塗工部Ｍが形成されるように、正極未塗工部Ｍの高さＨｍは、高さＨｍに対し想定される公差ｘよりも大きく設定されている（公差ｘ＋α）。様々なずれが複合して生じた場合に想定される公差ｘの最大値は１．０ｍｍの場合が多い。このため、本実施形態では、公差ｘは最大１．０ｍｍに設定されている。 Usually, in the positive electrode 21, the positive electrode uncoated portion M is manufactured aiming at a value set at design for the height Hm. However, due to various factors, the actual size of the height Hm may deviate from the set value. Many factors are based on the manufacture of the positive electrode 21, for example, a shift in coating of the active material mixture, and the cause of the active material mixture being separately coated on each side of the long metal foil 34. There is a gap, etc. In the present embodiment, the height Hm of the positive electrode uncoated portion M is based on the assumed tolerance x with respect to the height Hm so that the positive electrode uncoated portion M is formed even if these deviations occur. Is also set large (tolerance x + α). The maximum value of the tolerance x assumed when various deviations occur in combination is often 1.0 mm. For this reason, in the present embodiment, the tolerance x is set to a maximum of 1.0 mm.
　設定した公差ｘがプラス側に大きいほど、第１正極縁部２２ｂと第１正極塗工縁部２３ａとが離れ、正極未塗工部Ｍの高さＨｍの値は大きくなり、正極未塗工部Ｍは高くなる。一方、設定した公差ｘがマイナス側に大きいほど、第１正極縁部２２ｂと第１正極塗工縁部２３ａとが近付き、正極未塗工部Ｍの高さＨｍの値は小さくなり、正極未塗工部Ｍは低くなる。 As the set tolerance x is larger on the positive side, the first positive electrode edge 22b and the first positive electrode coated edge 23a are separated, and the value of the height Hm of the positive electrode uncoated portion M becomes larger, and the positive electrode uncoated Part M goes high. On the other hand, as the set tolerance x is larger on the negative side, the first positive electrode edge 22b and the first positive electrode coated edge 23a are closer, and the value of the height Hm of the positive electrode uncoated portion M is smaller. The coated part M is lowered.
　このように公差ｘが変動しても正極未塗工部Ｍが確保できるように、正極未塗工部Ｍの高さＨｍは、公差ｘよりも大きく設定され、公差ｘより大きく設定する値は１ｍｍ以下の範囲に設定されている。そして、このように設定される正極未塗工部Ｍの高さＨｍは、公差ｘの大きさに依存するが具体的には０．５～２．０ｍｍに設定されるのが好ましく、０．８～１．２ｍｍに設定されるのがより好ましい。例えば、正極未塗工部Ｍの高さＨｍが１．２ｍｍであれば、公差ｘが最大１．０ｍｍであったとしても、正極未塗工部Ｍを確保できる。また、正極未塗工部Ｍの高さＨｍが０．８～１．２ｍｍであると、正極未塗工部Ｍの高さＨｍを公差１．０ｍｍに近付けることができる。本実施形態では、正極電極２１において、正極未塗工部Ｍの高さＨｍは、１．２ｍｍに設定されている。そして、正極未塗工部Ｍの高さＨｍを、公差ｘよりも１ｍｍ以下の範囲で大きくなるように設定することで、正極未塗工部Ｍを確保できるようにしている。 Thus, the height Hm of the positive electrode uncoated portion M is set larger than the tolerance x and the value set larger than the tolerance x so that the positive electrode uncoated portion M can be secured even if the tolerance x changes. It is set in the range of 1 mm or less. And, the height Hm of the positive electrode uncoated portion M set in this way depends on the size of the tolerance x, but specifically, it is preferable to be set to 0.5 to 2.0 mm. More preferably, it is set to 8 to 1.2 mm. For example, when the height Hm of the positive electrode uncoated portion M is 1.2 mm, the positive electrode uncoated portion M can be secured even if the tolerance x is 1.0 mm at the maximum. Further, when the height Hm of the positive electrode uncoated portion M is 0.8 to 1.2 mm, the height Hm of the positive electrode uncoated portion M can be made close to the tolerance 1.0 mm. In the present embodiment, in the positive electrode 21, the height Hm of the positive electrode uncoated portion M is set to 1.2 mm. The positive electrode uncoated portion M can be secured by setting the height Hm of the positive electrode uncoated portion M to be larger than the tolerance x in the range of 1 mm or less.
　図４（ａ）に示すように、正極電極２１は、長尺帯状の電極材料３３を切断装置としての打ち抜き型３６により打ち抜いて（切断して）製造される。なお、切断装置としては、レーザ加工装置等、別の切断装置であってもよい。電極材料３３は、正極電極２１の正極金属箔２２を形成する長尺金属箔３４と、長尺金属箔３４の両面に設けられ、正極塗工部２３を形成する正極活物質合剤の塗工部３５とを備える。正極活物質合剤は、正極活物質、導電剤、及びバインダを混合したペースト状である。 As shown in FIG. 4A, the positive electrode 21 is manufactured by punching (cutting) a long strip-shaped electrode material 33 with a punching die 36 as a cutting device. The cutting device may be another cutting device such as a laser processing device. The electrode material 33 is provided on both surfaces of the long metal foil 34 forming the positive electrode metal foil 22 of the positive electrode 21 and the long metal foil 34, and is coated with a positive electrode active material mixture forming the positive electrode coating portion 23. And a unit 35. The positive electrode active material mixture is in the form of a paste in which a positive electrode active material, a conductive agent, and a binder are mixed.
　正極活物質合剤は、長尺金属箔３４の短手方向両端には塗布されない。電極材料３３の短手方向への寸法は、正極タブ３１の先端から第２正極縁部２２ｃまでの正極電極２１の寸法の２倍である。電極材料３３の短手方向に正極電極２１の高さ方向が沿う状態で、２つの正極電極２１が電極材料３３から打ち抜き可能である。なお、電極材料３３から１つの正極電極２１を形成するように、電極材料３３は、短手方向の一端側のみに正極活物質合剤の塗布されていない部分が形成されていてもよい。そして、塗工部３５から正極塗工部２３が形成され、塗工部３５の存在しない長尺金属箔３４の部分から正極タブ３１及び正極未塗工部Ｍが形成される。 The positive electrode active material mixture is not applied to both ends in the short direction of the long metal foil 34. The dimension of the electrode material 33 in the short direction is twice the dimension of the positive electrode 21 from the tip of the positive electrode tab 31 to the second positive electrode edge 22 c. The two positive electrodes 21 can be punched from the electrode material 33 in a state in which the height direction of the positive electrode 21 extends in the short direction of the electrode material 33. In order to form one positive electrode 21 from the electrode material 33, the electrode material 33 may have a portion to which a positive electrode active material mixture is not applied only on one end side in the short direction. Then, the positive electrode coated portion 23 is formed from the coated portion 35, and the positive electrode tab 31 and the positive electrode uncoated portion M are formed from the portion of the long metal foil 34 where the coated portion 35 does not exist.
　正極未塗工部Ｍを備えた正極電極２１は、その製造時、正極活物質合剤の塗工ずれ等が発生し、正極塗工部２３の高さＨ１が公差ｘ分、ずれても正極活物質合剤は正極本体部２２ａに塗布されつつ、正極未塗工部Ｍが形成される。よって、正極電極２１の製造時、正極活物質合剤が正極タブ３１となる位置に塗布されてしまうことを回避し、電池容量に寄与しない活物質が発生することを無くしている。また、公差ｘより大きくする範囲を１ｍｍ以下に設定することで、正極未塗工部Ｍが必要以上に大きくなることを規制している。 In the positive electrode 21 provided with the positive electrode uncoated portion M, a coating deviation or the like of the positive electrode active material mixture occurs at the time of its manufacture, and the positive electrode 21 is separated The positive electrode uncoated portion M is formed while the active material mixture is applied to the positive electrode main portion 22a. Accordingly, when the positive electrode 21 is manufactured, the positive electrode active material mixture is prevented from being applied to the position to be the positive electrode tab 31, and the generation of the active material which does not contribute to the battery capacity is eliminated. Further, by setting the range to be larger than the tolerance x to 1 mm or less, it is regulated that the positive electrode uncoated portion M becomes larger than necessary.
　次に、負極電極２４について説明する。
　図２に示すように、負極電極２４は、負極集電体としてのシート状の負極金属箔（本実施形態では銅箔）２５を備える。負極金属箔２５は矩形状の負極本体部２５ａと、負極本体部２５ａの長辺に沿う第１負極縁部２５ｂの一部から突出した形状の負極タブ３２と、を備える。 Next, the negative electrode 24 will be described.
As shown in FIG. 2, the negative electrode 24 includes a sheet-like negative metal foil (in the present embodiment, copper foil) 25 as a negative electrode current collector. The negative metal foil 25 includes a rectangular negative electrode main portion 25a and a negative electrode tab 32 having a shape protruding from a part of the first negative electrode edge 25b along the long side of the negative electrode main portion 25a.
　また、負極電極２４は、負極本体部２５ａの両面及び負極タブ３２における第１負極縁部２５ｂ寄りの一部（根本）に設けられた負極塗工部２６を有する。負極本体部２５ａ及び負極タブ３２の両面の負極塗工部２６は、同じ平面形状及び同じ厚みである。 Further, the negative electrode 24 has a negative electrode coated portion 26 provided on both surfaces of the negative electrode main portion 25 a and a part (root) near the first negative electrode edge 25 b of the negative electrode tab 32. The negative electrode coated portions 26 on both surfaces of the negative electrode main portion 25 a and the negative electrode tab 32 have the same planar shape and the same thickness.
　負極本体部２５ａは、第１負極縁部２５ｂの対辺となる長辺に沿う第２負極縁部２５ｃを有し、第１負極縁部２５ｂと第２負極縁部２５ｃを繋ぐ一対の短辺に沿う第３負極縁部２５ｄを有する。負極塗工部２６は、負極タブ３２の根本に存在する部分にタブ側塗工部２９を備える。負極塗工部２６は、負極タブ塗工縁部２６ｔを有する。負極タブ塗工縁部２６ｔは、負極タブ３２の幅方向に延びる端縁であり、負極タブ３２の先端寄りの端縁である。そして、負極タブ塗工縁部２６ｔは、負極塗工部２６の高さ方向一端に位置し、第１負極縁部２５ｂ側に位置する。よって、本実施形態では、負極タブ塗工縁部２６ｔが負極塗工縁部に相当する。なお、タブ側塗工部２９は、負極塗工部２６の平面視において、負極タブ塗工縁部２６ｔと第１負極縁部２５ｂに挟まれた領域に存在する部分である。 The negative electrode body 25a has a second negative electrode edge 25c along the long side opposite to the first negative electrode edge 25b, and a pair of short sides connecting the first negative electrode edge 25b and the second negative electrode edge 25c. It has a third negative electrode edge 25d along. The negative electrode coating portion 26 is provided with a tab side coating portion 29 in a portion existing at the root of the negative electrode tab 32. The negative electrode coating portion 26 has a negative electrode tab coating edge portion 26 t. The negative electrode tab coating edge 26 t is an edge extending in the width direction of the negative electrode tab 32, and is an edge near the tip of the negative electrode tab 32. The negative electrode tab coating edge portion 26 t is located at one end in the height direction of the negative electrode coating portion 26 and is located on the first negative electrode edge portion 25 b side. Thus, in the present embodiment, the negative electrode tab coating edge portion 26t corresponds to the negative electrode coating edge portion. In addition, the tab side coating part 29 is a part which exists in the area | region pinched | interposed into the negative electrode tab coating edge part 26t and the 1st negative electrode edge part 25b in planar view of the negative electrode coating part 26. FIG.
　また、負極電極２４は、負極タブ３２における負極タブ塗工縁部２６ｔより先端側に負極未塗工部Ｎを備える。負極未塗工部Ｎは、負極タブ３２において、負極塗工部２６の存在しない部分に存在する。負極未塗工部Ｎは、負極タブ塗工縁部２６ｔに沿って負極活物質合剤が塗布されず負極金属箔２５の露出した部分である。 Further, the negative electrode 24 is provided with the negative electrode uncoated portion N on the tip side of the negative electrode tab coated edge portion 26 t of the negative electrode tab 32. The negative electrode uncoated portion N is present in the negative electrode tab 32 in a portion where the negative electrode coated portion 26 does not exist. The negative electrode uncoated portion N is a portion where the negative electrode active material mixture is not applied along the negative electrode tab coating edge portion 26 t and the negative electrode metal foil 25 is exposed.
　図３に示すように、負極電極２４において、第１負極縁部２５ｂと第２負極縁部２５ｃとを最短距離で繋ぐ直線Ｌ２の延びる方向を高さ方向とする。高さ方向へのタブ側塗工部２９の寸法、すなわち高さ方向への第１負極縁部２５ｂから負極タブ塗工縁部２６ｔまでの寸法を高さｄとする。 As shown in FIG. 3, in the negative electrode 24, a direction in which a straight line L2 connecting the first negative electrode edge 25b and the second negative electrode edge 25c at the shortest distance is taken as the height direction. The dimension of the tab side coating portion 29 in the height direction, that is, the dimension from the first negative electrode edge 25 b in the height direction to the negative electrode tab coating edge 26 t is a height d.
　負極電極２４において、負極未塗工部Ｎを形成することとなる負極塗工部２６は、通常、高さｄについて設計時に設定された値を狙って製造される。しかし、様々な要因により、高さｄの実寸が、設定された値からずれる場合がある。要因は、負極電極２４の製造に基づくものが多く、例えば活物質合剤の塗工時のずれ、活物質合剤が負極金属箔２５に対し片面ずつ別々に塗布されることを原因としたずれ等がある。本実施形態では、これらのずれが生じたとしても、タブ側塗工部２９が形成されるように、タブ側塗工部２９の高さｄは、想定される公差ｙよりも大きく設定されている（公差ｙ＋α）。 In the negative electrode 24, the negative electrode coated portion 26, which is to form the negative electrode uncoated portion N, is usually manufactured aiming at a value set at the design for the height d. However, due to various factors, the actual size of the height d may deviate from the set value. Many factors are based on the manufacture of the negative electrode 24, for example, a shift during coating of the active material mixture, a shift due to the active material mixture being separately applied to the negative electrode metal foil 25 on one side Etc. In the present embodiment, even if these deviations occur, the height d of the tab side coating portion 29 is set larger than the assumed tolerance y so that the tab side coating portion 29 is formed. (Tolerance y + α).
　設定した公差ｙがプラス側に大きいほど、負極タブ塗工縁部２６ｔと第１負極塗工縁部２６ａとが離れ、タブ側塗工部２９の高さｄの値は大きくなり、タブ側塗工部２９は高くなる。一方、設定した公差ｙがマイナス側に大きいほど、負極タブ塗工縁部２６ｔと第１負極塗工縁部２６ａとが近付き、タブ側塗工部２９の高さｄの値は小さくなり、タブ側塗工部２９は低くなる。 As the set tolerance y is larger on the positive side, the negative electrode tab coating edge portion 26 t and the first negative electrode coating edge portion 26 a are separated, and the value of the height d of the tab side coating portion 29 becomes larger. The work section 29 becomes higher. On the other hand, as the set tolerance y is larger on the negative side, the negative electrode tab coating edge portion 26 t and the first negative electrode coating edge portion 26 a are closer, and the value of the height d of the tab side coating portion 29 becomes smaller. The side coating portion 29 is lowered.
　このように公差ｙが変動してもタブ側塗工部２９が確保できるように、すなわち、第１負極塗工縁部２６ａが第１負極縁部２５ｂ上に位置するように、タブ側塗工部２９の高さｄは、公差ｙよりも大きく設定され、公差ｙより大きく設定する値は１ｍｍ以下の範囲に設定されている。そして、このように設定されるタブ側塗工部２９の高さｄは、公差ｙの大きさに依存するが具体的には０．５～２．０ｍｍに設定されるのが好ましく、０．８～１．２ｍｍに設定されるのがより好ましい。例えば、タブ側塗工部２９の高さｄが１．２ｍｍであれば、公差ｙが最大１．０ｍｍであったとしてもタブ側塗工部２９を確保でき、第１負極塗工縁部２６ａが第１負極縁部２５ｂ上に位置するようになる。また、タブ側塗工部２９の高さｄが０．８～１．２ｍｍであると、タブ側塗工部２９の高さｄを公差１．０ｍｍに近付けることができる。本実施形態では、タブ側塗工部２９の高さｄは、１．２ｍｍに設定されている。そして、タブ側塗工部２９の高さｄを、公差ｙよりも１ｍｍ以下の範囲で大きくなるように設定することで、タブ側塗工部２９を確保できるようにしている。 Thus, the tab side coating is performed so that the tab side coating portion 29 can be secured even if the tolerance y changes, that is, the first negative electrode coating edge portion 26a is positioned on the first negative electrode edge portion 25b. The height d of the portion 29 is set larger than the tolerance y, and the value set larger than the tolerance y is set in the range of 1 mm or less. The height d of the tab-side coating portion 29 set in this way depends on the size of the tolerance y, but specifically, it is preferably set to 0.5 to 2.0 mm. More preferably, it is set to 8 to 1.2 mm. For example, if the height d of the tab side coating portion 29 is 1.2 mm, the tab side coating portion 29 can be secured even if the tolerance y is 1.0 mm at the maximum, and the first negative electrode coating edge portion 26 a Is located on the first negative electrode edge 25b. In addition, when the height d of the tab-side coating portion 29 is 0.8 to 1.2 mm, the height d of the tab-side coating portion 29 can be made close to the tolerance 1.0 mm. In the present embodiment, the height d of the tab-side coating portion 29 is set to 1.2 mm. The tab-side coating portion 29 can be secured by setting the height d of the tab-side coating portion 29 to be larger than the tolerance y within a range of 1 mm or less.
　図４（ｂ）に示すように、負極電極２４は、長尺帯状の電極材料３３を切断装置としての打ち抜き型３６により打ち抜いて（切断して）製造される。なお、切断装置としては、レーザ加工装置等、別の切断装置であってもよい。電極材料３３は、負極電極２４の負極金属箔２５を形成する長尺金属箔３４と、長尺金属箔３４の両面に設けられ、負極塗工部２６を形成する負極活物質合剤の塗工部３５とを備える。負極活物質合剤は、負極活物質、導電剤、及びバインダを混合したペースト状である。 As shown in FIG. 4B, the negative electrode 24 is manufactured by punching (cutting) a long strip-shaped electrode material 33 with a punching die 36 as a cutting device. The cutting device may be another cutting device such as a laser processing device. The electrode material 33 is provided on both sides of the long metal foil 34 forming the negative electrode metal foil 25 of the negative electrode 24, and the negative electrode active material mixture which is provided on both sides of the long metal foil 34 and forms the negative electrode coated portion 26. And a unit 35. The negative electrode active material mixture is in the form of a paste in which a negative electrode active material, a conductive agent, and a binder are mixed.
　負極活物質合剤は、長尺金属箔３４の短手方向両端には塗布されない。電極材料３３の短手方向への寸法は、負極タブ３２の先端から第２負極縁部２５ｃまでの負極電極２４の寸法の２倍である。電極材料３３の短手方向に負極電極２４の高さ方向が沿う状態で、２つの負極電極２４が電極材料３３から打ち抜き可能である。なお、電極材料３３から１つの負極電極２４を形成するように、電極材料３３は、短手方向の一端側のみに負極活物質合剤の塗布されていない部分が形成されていてもよい。そして、塗工部３５から負極塗工部２６が形成され、塗工部３５の存在しない長尺金属箔３４の部分から負極タブ３２及び負極未塗工部Ｎが形成される。 The negative electrode active material mixture is not applied to both ends of the long metal foil 34 in the short direction. The dimension of the electrode material 33 in the short direction is twice the dimension of the negative electrode 24 from the tip of the negative electrode tab 32 to the second negative electrode edge 25 c. The two negative electrodes 24 can be punched from the electrode material 33 in a state where the height direction of the negative electrode 24 is aligned with the short direction of the electrode material 33. In order to form one negative electrode 24 from the electrode material 33, the electrode material 33 may have a portion to which the negative electrode active material mixture is not applied only on one end side in the short direction. Then, the negative electrode coated portion 26 is formed from the coated portion 35, and the negative electrode tab 32 and the negative electrode uncoated portion N are formed from the portion of the long metal foil 34 where the coated portion 35 does not exist.
　タブ側塗工部２９を備えた負極電極２４は、その製造時、負極活物質合剤の塗工ずれ等が発生し、タブ側塗工部２９の高さｄが公差ｙ分、ずれても負極活物質合剤は負極タブ３２に塗布されつつ、タブ側塗工部２９が形成されるとともに、負極未塗工部Ｎが形成される。 At the time of manufacture of the negative electrode 24 provided with the tab side coating portion 29, coating deviation or the like of the negative electrode active material mixture occurs, and even if the height d of the tab side coating portion 29 deviates by the tolerance y. While the negative electrode active material mixture is applied to the negative electrode tab 32, the tab-side coated portion 29 is formed, and the negative electrode uncoated portion N is formed.
　また、負極塗工部２６は、第１負極塗工縁部２６ａの対辺に第２負極塗工縁部２６ｂを有し、第２負極塗工縁部２６ｂは負極本体部２５ａの第２負極縁部２５ｃに沿って設けられている。同様に、負極塗工部２６は、第１負極塗工縁部２６ａと第２負極塗工縁部２６ｂを繋ぐ一対の端縁に第３負極塗工縁部２６ｃを有し、第３負極塗工縁部２６ｃは負極本体部２５ａの第３負極縁部２５ｄに沿って設けられている。したがって、負極電極２４について、第２負極縁部２５ｃ、及び第３負極縁部２５ｄに沿って負極本体部２５ａが露出した未塗工部は存在せず、負極本体部２５ａの四辺全てに未塗工部は存在しない。 Further, the negative electrode coating portion 26 has a second negative electrode coating edge 26b on the opposite side of the first negative electrode coating edge 26a, and the second negative electrode coating edge 26b is a second negative electrode edge of the negative electrode main portion 25a. It is provided along the part 25c. Similarly, the negative electrode coating portion 26 has a third negative electrode coating edge portion 26c at a pair of end edges connecting the first negative electrode coating edge portion 26a and the second negative electrode coating edge portion 26b. The processing edge portion 26c is provided along the third negative electrode edge portion 25d of the negative electrode main portion 25a. Therefore, in the negative electrode 24, there is no uncoated portion where the negative electrode body 25a is exposed along the second negative electrode edge 25c and the third negative electrode edge 25d, and all four sides of the negative electrode body 25a are uncoated. There is no work department.
　そして、図２に示すように、電極組立体１４は、正極電極２１及び負極電極２４の間にセパレータ２７を挟んだ状態で、正極電極２１及び負極電極２４を前後方向（厚さ方向）に積層して形成されている。 Then, as shown in FIG. 2, the electrode assembly 14 has the positive electrode 21 and the negative electrode 24 stacked in the front-rear direction (thickness direction) with the separator 27 sandwiched between the positive electrode 21 and the negative electrode 24. It is formed.
　図１に示すように、各正極電極２１は、それぞれの正極タブ３１が積層方向に沿って列状に配置されるように積層される。積層された状態の各正極タブ３１は、第１正極縁部２２ｂ寄りの基端側から折り曲げられるとともに、折り曲げ部から先端に向かう方向が積層方向である。同様に、各負極電極２４は、それぞれの負極タブ３２が、正極タブ３１と重ならないように積層方向に沿って列状に配置されるように積層される。積層された状態の各負極タブ３２は、第１負極縁部２５ｂ寄りの基端側から折り曲げられるとともに、折り曲げ部から先端に向かう方向が積層方向である。正極電極２１と負極電極２４は、正極タブ３１と負極タブ３２とが電極組立体１４の同じ端面から同じ方向に突出している。そして、各正極電極２１の正極タブ３１は、図１に示すように、正極端子１５と電気的に接続される。また、各負極電極２４の負極タブ３２も同様に、図１に示すように、負極端子１６と電気的に接続される。 As shown in FIG. 1, the positive electrodes 21 are stacked such that the positive tabs 31 are arranged in a row along the stacking direction. Each positive electrode tab 31 in the stacked state is bent from the base end side near the first positive electrode edge 22 b, and the direction from the bent portion toward the tip is the stacking direction. Similarly, the negative electrodes 24 are stacked such that the negative tabs 32 are arranged in a row along the stacking direction so as not to overlap with the positive tabs 31. The respective negative electrode tabs 32 in the laminated state are bent from the base end side closer to the first negative electrode edge 25b, and the direction from the bent portion toward the tip is the laminating direction. The positive electrode tab 31 and the negative electrode tab 32 project in the same direction from the same end face of the electrode assembly 14 in the positive electrode 21 and the negative electrode 24. And the positive electrode tab 31 of each positive electrode 21 is electrically connected with the positive electrode terminal 15, as shown in FIG. Similarly, as shown in FIG. 1, the negative electrode tab 32 of each negative electrode 24 is electrically connected to the negative electrode terminal 16.
　次に、正極電極２１及び負極電極２４について詳細に説明する。
　図５に示すように、電極組立体１４は、正極塗工部２３の全面に対し、セパレータ２７を介して負極塗工部２６が対向するように積層される必要がある。このため、負極塗工部２６における塗工部高さＨ２は、正極塗工部２３の高さＨ１より大きく設定されている。また、電極組立体１４について、正極電極２１及び負極電極２４は、第１負極塗工縁部２６ａが、第１正極塗工縁部２３ａよりも高さ方向上側に位置するように積層される。すなわち、第１負極塗工縁部２６ａは、第１負極縁部２５ｂからの負極タブ３２の突出方向に沿って、第１正極塗工縁部２３ａを越えた位置にある。また、正極電極２１及び負極電極２４は、第１負極縁部２５ｂが、第１正極縁部２２ｂの上側に位置するように積層される。すなわち、第１負極縁部２５ｂは、第１負極縁部２５ｂからの負極タブ３２の突出方向に沿って、第１正極縁部２２ｂを越えた位置にある。 Next, the positive electrode 21 and the negative electrode 24 will be described in detail.
As shown in FIG. 5, the electrode assembly 14 needs to be stacked on the entire surface of the positive electrode coating unit 23 so that the negative electrode coating unit 26 faces the separator 27. For this reason, the coated portion height H2 in the negative electrode coated portion 26 is set larger than the height H1 of the positive electrode coated portion 23. In the electrode assembly 14, the positive electrode 21 and the negative electrode 24 are stacked such that the first negative electrode coating edge 26 a is positioned above the first positive electrode coating edge 23 a in the height direction. That is, the first negative electrode coating edge portion 26a is located beyond the first positive electrode coating edge portion 23a along the direction in which the negative electrode tab 32 protrudes from the first negative electrode edge portion 25b. In addition, the positive electrode 21 and the negative electrode 24 are stacked such that the first negative electrode edge 25 b is positioned above the first positive electrode edge 22 b. That is, the first negative electrode edge 25 b is located beyond the first positive electrode edge 22 b in the direction in which the negative electrode tab 32 protrudes from the first negative electrode edge 25 b.
　電極組立体１４の底側では、正極電極２１及び負極電極２４は、第２負極塗工縁部２６ｂが第２正極塗工縁部２３ｂよりも高さ方向下側に位置するように積層される。言い換えると、正極電極２１及び負極電極２４は、第２負極縁部２５ｃが第２正極縁部２２ｃより下側に位置するように積層される。 On the bottom side of the electrode assembly 14, the positive electrode 21 and the negative electrode 24 are stacked such that the second negative electrode coating edge 26b is positioned lower than the second positive electrode coating edge 23b in the height direction. . In other words, the positive electrode 21 and the negative electrode 24 are stacked such that the second negative electrode edge 25 c is positioned below the second positive electrode edge 22 c.
　次に、二次電池１０の作用効果を記載する。
　（１）正極未塗工部Ｍの高さＨｍは、想定される公差ｘよりも大きく設定され、公差ｘよりも１ｍｍ以下の範囲で大きくなるように設定されている。このため、例えば、図３の２点鎖線に示すように、公差ｘだけ第１正極塗工縁部２３ａの位置が第１正極縁部２２ｂ側にずれたとしても、第１正極塗工縁部２３ａは２点鎖線Ｔ１に示す場所に位置し、正極未塗工部Ｍは確保され、公差ｘによる影響なく、正極未塗工部Ｍを備えた正極電極２１を提供できる。したがって、電極材料３３を切断して正極電極２１を製造する際、第１正極縁部２２ｂに沿う箇所については長尺金属箔３４（正極金属箔２２）のみの切断となる。その結果、例えば、正極電極２１を製造する際、第１正極縁部２２ｂに沿う箇所については長尺金属箔３４のみの切断があったり、塗工部３５（正極塗工部２３）と長尺金属箔３４（正極金属箔２２）の積層構造の切断があったりする場合と異なり、同じ切断条件で正極電極２１の製造を行うことができ、正極電極２１の品質のバラツキを抑制できる。また、正極電極２１に正極未塗工部Ｍを確保でき、正極活物質合剤の塗布時にずれが生じても、正極活物質合剤は正極未塗工部Ｍに塗工され、正極タブ３１に正極塗工部２３が形成されることを回避し、電池容量に寄与しない活物質が発生することを無くすことができる。 Next, the effects of the secondary battery 10 will be described.
(1) The height Hm of the positive electrode uncoated portion M is set to be larger than the assumed tolerance x, and set to be larger than the tolerance x in a range of 1 mm or less. Therefore, for example, as shown by the two-dot chain line in FIG. 3, even if the position of the first positive electrode coating edge 23a is shifted toward the first positive electrode edge 22b by the tolerance x, the first positive electrode coating edge 23a is located at a position indicated by a two-dot chain line T1, the positive electrode uncoated portion M is secured, and the positive electrode 21 provided with the positive electrode uncoated portion M can be provided without the influence of the tolerance x. Therefore, when manufacturing the positive electrode 21 by cutting the electrode material 33, only the long metal foil 34 (positive metal foil 22) is cut along the first positive electrode edge 22b. As a result, for example, when manufacturing the positive electrode 21, only the long metal foil 34 is cut at a location along the first positive electrode edge 22b, or the coated portion 35 (the positive electrode coated portion 23) is long. Unlike the case where the laminated structure of the metal foil 34 (positive electrode metal foil 22) is cut, the positive electrode 21 can be manufactured under the same cutting conditions, and the variation in quality of the positive electrode 21 can be suppressed. In addition, even if the positive electrode uncoated portion M can be secured to the positive electrode 21 and a shift occurs during application of the positive electrode active material mixture, the positive electrode active material mixture is coated on the positive electrode uncoated portion M, and the positive electrode tab 31 The formation of the positive electrode coating portion 23 can be avoided, and the generation of an active material that does not contribute to the battery capacity can be eliminated.
　（２）正極未塗工部Ｍの高さＨｍは、０．５～２．０ｍｍに設定されるのが好ましく、０．８～１．２ｍｍに設定されるのがより好ましい。このように構成すると正極未塗工部Ｍを確保しつつ、正極未塗工部Ｍの高さＨｍを公差１．０ｍｍに近付けることができる。 (2) The height Hm of the positive electrode uncoated portion M is preferably set to 0.5 to 2.0 mm, and more preferably set to 0.8 to 1.2 mm. If comprised in this way, height Hm of the positive electrode uncoated part M can be made close to tolerance 1.0 mm, ensuring the positive electrode uncoated part M.
　（３）負極電極２４のタブ側塗工部２９の高さｄは、想定される公差ｙよりも大きく設定され、公差ｙよりも１ｍｍ以下の範囲で大きくなるように設定されている。このため、例えば、図３の２点鎖線に示すように、公差ｙだけ負極タブ塗工縁部２６ｔの位置が第１負極塗工縁部２６ａ側にずれたとしても、負極タブ塗工縁部２６ｔは２点鎖線Ｔ２に示す場所に位置し、タブ側塗工部２９は確保され、公差ｙの影響なく、第１負極塗工縁部２６ａを第１負極縁部２５ｂ上に位置させた負極電極２４を提供できる。よって、電極材料３３を切断して負極電極２４を製造する際、第１負極縁部２５ｂに沿う箇所については長尺金属箔３４（負極金属箔２５）と塗工部３５（負極塗工部２６）の切断となる。その結果、例えば、負極電極２４を製造する際、第１負極縁部２５ｂに沿う箇所については長尺金属箔３４のみの切断があったり、塗工部３５（負極塗工部２６）と長尺金属箔３４（負極金属箔２５）の積層構造の切断があったりする場合と異なり、同じ切断条件で負極電極２４の製造を行うことができ、負極電極２４の品質のバラツキを抑制できる。また、負極電極２４の負極本体部２５ａに未塗工部が形成されることを抑制でき、正極塗工部２３の第１正極塗工縁部２３ａの一部に負極塗工部２６を対向させ、短絡や、リチウム析出を抑制できる。また、負極未塗工部Ｎが正極塗工部２３に接触することを抑制できる。 (3) The height d of the tab side coating portion 29 of the negative electrode 24 is set to be larger than the assumed tolerance y, and set to be larger than the tolerance y in a range of 1 mm or less. Therefore, for example, as shown by a two-dot chain line in FIG. 3, even if the position of the negative electrode tab coating edge 26t is shifted toward the first negative electrode coating edge 26a by the tolerance y, the negative electrode tab coating edge 26t is located at a position indicated by a two-dot chain line T2, the tab side coating portion 29 is secured, and the negative electrode in which the first negative electrode coating edge 26a is positioned on the first negative electrode edge 25b without the influence of the tolerance y. An electrode 24 can be provided. Therefore, when manufacturing the negative electrode 24 by cutting the electrode material 33, the long metal foil 34 (the negative metal foil 25) and the coated portion 35 (the negative coated portion 26) are provided along the first negative electrode edge 25b. ) Cutting. As a result, for example, when manufacturing the negative electrode 24, only the long metal foil 34 is cut at a location along the first negative electrode edge 25b, or the coated portion 35 (negative electrode coated portion 26) and the long Unlike the case where the laminated structure of the metal foil 34 (negative electrode metal foil 25) is cut, the negative electrode 24 can be manufactured under the same cutting conditions, and variations in the quality of the negative electrode 24 can be suppressed. Moreover, it can suppress that an uncoated part is formed in the negative electrode main-body part 25a of the negative electrode 24, and makes the negative electrode coating part 26 be opposite to a part of 1st positive electrode coating edge part 23a of the positive electrode coating part 23. Short circuit and lithium deposition can be suppressed. Moreover, it can suppress that the negative electrode uncoated part N contacts the positive electrode coating part 23. FIG.
　（４）タブ側塗工部２９の高さｄは、０．５～２．０ｍｍに設定されるのが好ましく、０．８～１．２ｍｍに設定されるのがより好ましい。このように構成するとタブ側塗工部２９を確保しつつ、タブ側塗工部２９の高さｄを公差１．０ｍｍに近付けることができる。 (4) The height d of the tab side coating portion 29 is preferably set to 0.5 to 2.0 mm, and more preferably set to 0.8 to 1.2 mm. With this configuration, the height d of the tab side coating portion 29 can be made close to the tolerance 1.0 mm while securing the tab side coating portion 29.
　（５）第１負極縁部２５ｂは第１正極縁部２２ｂより高さ方向上側にあり、負極タブ塗工縁部２６ｔは第１正極塗工縁部２３ａよりも高さ方向上側にある。このため、電極組立体１４において、高さ方向にずれが生じたとしても、正極塗工部２３の全面に負極塗工部２６を対向させた状態を維持できる。 (5) The first negative electrode edge 25b is located above the first positive electrode edge 22b in the height direction, and the negative electrode tab coating edge 26t is located higher than the first positive electrode coating edge 23a in the height direction. For this reason, in the electrode assembly 14, even if a shift occurs in the height direction, the state in which the negative electrode coated portion 26 is opposed to the entire surface of the positive electrode coated portion 23 can be maintained.
　（６）正極タブ３１は、第１正極縁部２２ｂ寄りの基端側から折り曲げられている。正極電極２１では、正極未塗工部Ｍの高さＨｍを公差ｘより大きくしつつも上限を規定している。このため、正極未塗工部Ｍの高さＨｍが大きくなりすぎることを抑制し、第１正極縁部２２ｂからの正極タブ３１の突出長さが短くなることを抑制している。その結果、第１正極縁部２２ｂからの正極タブ３１の突出長さが短くなることを原因として、正極タブ３１の折り曲げ部に発生する応力を抑え、正極タブ３１の折り曲げ部に亀裂等が入ることを抑制しやすくなる。 (6) The positive electrode tab 31 is bent from the base end side near the first positive electrode edge 22 b. In the positive electrode 21, the upper limit is defined while the height Hm of the positive electrode uncoated portion M is larger than the tolerance x. For this reason, it is suppressed that the height Hm of the positive electrode uncoated portion M becomes too large, and the shortening of the protrusion length of the positive electrode tab 31 from the first positive electrode edge portion 22b is suppressed. As a result, due to the protrusion length of the positive electrode tab 31 from the first positive electrode edge 22b becoming short, the stress generated at the bent portion of the positive electrode tab 31 is suppressed, and a crack or the like is generated at the bent portion of the positive electrode tab 31 Makes it easier to
　（７）負極タブ３２は、第１負極縁部２５ｂ寄りの基端側から折り曲げられている。負極タブ３２上でのタブ側塗工部２９の高さｄについて、公差ｙより大きくしつつも上限を規定している。このため、タブ側塗工部２９の高さｄが大きくなりすぎることを抑制し、負極タブ３２上でのタブ側塗工部２９を少なくし、折り曲げ部に発生する応力を抑え、負極タブ３２上のタブ側塗工部２９からの活物質の脱落を抑制しやすくなる。 (7) The negative electrode tab 32 is bent from the base end side near the first negative electrode edge 25 b. The upper limit of the height d of the tab-side coating portion 29 on the negative electrode tab 32 is defined while being larger than the tolerance y. Therefore, the height d of the tab-side coating portion 29 is prevented from becoming too large, the tab-side coating portion 29 on the negative electrode tab 32 is reduced, and the stress generated in the bent portion is suppressed. It becomes easy to control the falling off of the active material from the upper tab side coating portion 29.
　なお、本実施形態は以下のように変更してもよい。
　○　実施形態の負極電極２４について、タブ側塗工部２９は無くてもよく、この場合、第１負極塗工縁部２６ａは第１負極縁部２５ｂ上に位置してもよいし、第１負極縁部２５ｂよりも第２負極縁部２５ｃ寄りに位置してもよい。 The present embodiment may be modified as follows.
In the negative electrode 24 of the embodiment, the tab-side coating portion 29 may not be provided, and in this case, the first negative electrode coating edge 26a may be located on the first negative electrode edge 25b. You may be located near the 2nd negative electrode edge 25c rather than the negative electrode edge 25b.
　○　実施形態の正極電極２１について、正極未塗工部Ｍは無くてもよく、この場合、第１正極塗工縁部２３ａは第１正極縁部２２ｂ上に位置してもよいし、正極タブ３１上に位置していてもよい。 In the positive electrode 21 of the embodiment, the positive electrode uncoated portion M may not be present, and in this case, the first positive electrode coated edge 23a may be located on the first positive electrode edge 22b, or the positive electrode tab It may be located on 31.
　○　上記構成を有する正極電極２１と負極電極２４であれば、正極タブ３１の突出する向きと、負極タブ３２が突出する向きが異なるように積層されていても、実施形態と同様の作用効果を奏する。 If it is positive electrode 21 and negative electrode 24 which have the above-mentioned composition, even if it is laminated so that the direction in which the positive electrode tab 31 protrudes and the direction in which the negative electrode tab 32 protrudes differ, the same operation effect as an embodiment Play.
　○　二次電池１０は、リチウムイオン二次電池であったが、これに限らず、他の二次電池であってもよい。要するに、正極活物質と負極活物質との間をイオンが移動するとともに電荷の授受を行うものであればよい。 The secondary battery 10 is a lithium ion secondary battery, but is not limited to this, and may be another secondary battery. In short, it is sufficient that the ions move between the positive electrode active material and the negative electrode active material and transfer and receive electric charges.
　○　正極集電体として正極金属箔２２に具体化し、負極集電体として負極金属箔２５に具体化したが、塗工部を保持できれば集電体は金属箔以外のシート体であってもよい。
　○　電気二重層キャパシタ等の蓄電装置に具体化してもよい。 ○ Although the positive electrode current collector is embodied in the positive electrode metal foil 22 and the negative electrode current collector is embodied in the negative electrode metal foil 25, the current collector may be a sheet other than the metal foil as long as the coated portion can be held. .
The present invention may be embodied in a storage device such as an electric double layer capacitor.
　Ｈｍ…高さ、Ｍ…正極未塗工部、１０…蓄電装置としての二次電池、１４…電極組立体、２１…正極電極、２２…正極集電体としての正極金属箔、２２ａ…正極本体部、２２ｂ…第１正極縁部、２２ｃ…第２正極縁部、２３…正極塗工部、２３ａ…第１正極塗工縁部、２４…負極電極、２５…負極集電体としての負極金属箔、２５ａ…負極本体部、２５ｂ…第１負極縁部、２５ｃ…第２負極縁部、２６…負極塗工部、２６ｔ…負極塗工縁部としての負極タブ塗工縁部、３１…正極タブ、３２…負極タブ。 Hm Height, M: Positive electrode uncoated portion, 10: Secondary battery as a storage device, 14: Electrode assembly, 21: Positive electrode, 22: Positive metal foil as positive current collector, 22a: Positive body Part 22b: first positive electrode edge 22c: second positive electrode edge 23: positive electrode coating portion 23a: first positive electrode coating edge 24: negative electrode 25: negative electrode metal as negative electrode current collector Foil 25a: negative electrode body portion 25b: first negative electrode edge portion 25c: second negative electrode edge portion 26: negative electrode coating portion 26t: negative electrode tab coating edge portion as negative electrode coating edge portion 31: positive electrode Tab, 32 ... negative electrode tab.

Claims (8)

  1. 　複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、
    　前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、
    　前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部と、前記第１正極縁部に沿って正極活物質合剤が塗布されず前記正極本体部の露出した正極未塗工部とを備え、
    　前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とした場合、前記高さ方向への前記正極塗工縁部から前記第１正極縁部までの寸法である前記正極未塗工部の高さは、前記正極未塗工部の高さに設定された公差より大きく、当該公差より大きくする範囲は１．０ｍｍ以下であり、
    　前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、
    　前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、
    　前記負極塗工縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあることを特徴とする蓄電装置。     A power storage device comprising an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being insulated from each other,
    The positive electrode includes a positive electrode current collector, and the positive electrode current collector includes a rectangular positive electrode main body, and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body. And having a second positive electrode edge which is opposite to the first positive electrode edge of the positive electrode body,
    The positive electrode coating portion formed by applying the positive electrode active material mixture on the surface of the positive electrode body portion and the positive electrode active material mixture not being applied along the first positive electrode edge portion exposed the positive electrode body portion And a positive electrode uncoated portion,
    When the direction in which a straight line connecting the first positive electrode edge portion and the second positive electrode edge portion is the shortest distance in the positive electrode electrode extends in the height direction, the positive electrode coating portion is located at one end in the height direction of the positive electrode coating portion; When the edge on the first positive electrode edge side is a positive electrode coated edge, the positive electrode uncoated in a dimension from the positive electrode coated edge in the height direction to the first positive electrode edge The height of the part is greater than the tolerance set to the height of the uncoated part of the positive electrode, and the range of larger than the tolerance is 1.0 mm or less,
    The negative electrode includes a negative electrode current collector, and the negative electrode current collector includes a rectangular negative electrode main body, and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body. And a second negative electrode edge portion opposite to the first negative electrode edge portion of the negative electrode main body portion, and a negative electrode coating portion formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion. Equipped with
    In the negative electrode, when the direction in which the straight line connecting the first negative electrode edge and the second negative electrode edge extends in the shortest distance is the height direction, it is located at one end in the height direction of the negative electrode coated portion When the edge on the side of the first negative electrode edge is a negative electrode coated edge,
    The negative electrode coating edge portion is located at a position where the negative electrode tab extends beyond the positive electrode coating edge portion along a direction in which the negative electrode tab protrudes from the first negative electrode edge portion along the height direction. apparatus.
  2. 　複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、
    　前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、
    　前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部と、前記第１正極縁部に沿って正極活物質合剤が塗布されず前記正極本体部の露出した正極未塗工部とを備え、
    　前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とした場合、前記高さ方向への前記正極塗工縁部から前記第１正極縁部までの寸法である前記正極未塗工部の高さは０．５～２．０ｍｍであり、
    　前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、
    　前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、
    　前記負極塗工縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあることを特徴とする蓄電装置。     A power storage device comprising an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being insulated from each other,
    The positive electrode includes a positive electrode current collector, and the positive electrode current collector includes a rectangular positive electrode main body, and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body. And having a second positive electrode edge which is opposite to the first positive electrode edge of the positive electrode body,
    The positive electrode coating portion formed by applying the positive electrode active material mixture on the surface of the positive electrode body portion and the positive electrode active material mixture not being applied along the first positive electrode edge portion exposed the positive electrode body portion And a positive electrode uncoated portion,
    When the direction in which a straight line connecting the first positive electrode edge portion and the second positive electrode edge portion is the shortest distance in the positive electrode electrode extends in the height direction, the positive electrode coating portion is located at one end in the height direction of the positive electrode coating portion; When the edge on the first positive electrode edge side is a positive electrode coated edge, the positive electrode uncoated in a dimension from the positive electrode coated edge in the height direction to the first positive electrode edge The height of the part is 0.5 to 2.0 mm,
    The negative electrode includes a negative electrode current collector, and the negative electrode current collector includes a rectangular negative electrode main body, and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body. And a second negative electrode edge portion opposite to the first negative electrode edge portion of the negative electrode main body portion, and a negative electrode coating portion formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion. Equipped with
    In the negative electrode, when the direction in which the straight line connecting the first negative electrode edge and the second negative electrode edge extends in the shortest distance is the height direction, it is located at one end in the height direction of the negative electrode coated portion When the edge on the side of the first negative electrode edge is a negative electrode coated edge,
    The negative electrode coating edge portion is located at a position where the negative electrode tab extends beyond the positive electrode coating edge portion along a direction in which the negative electrode tab protrudes from the first negative electrode edge portion along the height direction. apparatus.
  3. 　前記正極タブは、前記第１正極縁部寄りの基端側から折り曲げられている請求項１又は請求項２に記載の蓄電装置。 The power storage device according to claim 1, wherein the positive electrode tab is bent from a base end side closer to the first positive electrode edge.
  4. 　複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、
    　前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、
    　前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部を備え、
    　前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とし、
    　前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、
    　前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、
    　前記負極塗工縁部は、前記負極タブ上にあり、かつ前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあり、
    　前記高さ方向への前記第１負極縁部から前記負極塗工縁部までの高さは、当該高さに設定された公差より大きく、当該公差より大きくする範囲は１．０ｍｍ以下であることを特徴とする蓄電装置。     A power storage device comprising an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being insulated from each other,
    The positive electrode includes a positive electrode current collector, and the positive electrode current collector includes a rectangular positive electrode main body, and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body. And having a second positive electrode edge which is opposite to the first positive electrode edge of the positive electrode body,
    And a positive electrode coating portion formed by applying a positive electrode active material mixture on the surface of the positive electrode main body,
    When the direction in which a straight line connecting the first positive electrode edge portion and the second positive electrode edge portion is the shortest distance in the positive electrode electrode extends in the height direction, the positive electrode coating portion is located at one end in the height direction of the positive electrode coating portion; And the edge on the first positive electrode edge side is a positive electrode coated edge,
    The negative electrode includes a negative electrode current collector, and the negative electrode current collector includes a rectangular negative electrode main body, and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body. And a second negative electrode edge portion opposite to the first negative electrode edge portion of the negative electrode main body portion, and a negative electrode coating portion formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion. Equipped with
    In the negative electrode, when the direction in which the straight line connecting the first negative electrode edge and the second negative electrode edge extends in the shortest distance is the height direction, it is located at one end in the height direction of the negative electrode coated portion When the edge on the side of the first negative electrode edge is a negative electrode coated edge,
    The negative electrode coating edge is on the negative electrode tab, and the position where the negative electrode tab extends beyond the positive electrode coating edge along the direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction In
    The height from the first negative electrode edge to the negative electrode coating edge in the height direction is larger than the tolerance set to the height, and the range to be larger than the tolerance is 1.0 mm or less A power storage device characterized by
  5. 　複数の正極電極と複数の負極電極とが互いに絶縁された状態で交互に積層された電極組立体を有する蓄電装置であって、
    　前記正極電極は、正極集電体を備えるとともに、該正極集電体は矩形状の正極本体部と、該正極本体部の第１正極縁部の一部から突出した形状の正極タブと、を備え、かつ前記正極本体部の前記第１正極縁部の対辺となる第２正極縁部を有し、
    　前記正極本体部の表面に正極活物質合剤を塗布して形成された正極塗工部を備え、
    　前記正極電極について、前記第１正極縁部と前記第２正極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記正極塗工部の高さ方向一端に位置し、かつ前記第１正極縁部側の縁部を正極塗工縁部とし、
    　前記負極電極は、負極集電体を備えるとともに、該負極集電体は矩形状の負極本体部と、該負極本体部の第１負極縁部の一部から突出した形状の負極タブと、を備え、かつ前記負極本体部の前記第１負極縁部の対辺となる第２負極縁部を有し、前記負極本体部の表面に負極活物質合剤を塗布して形成された負極塗工部を備え、
    　前記負極電極について、前記第１負極縁部と前記第２負極縁部とを最短距離で結ぶ直線の延びる方向を高さ方向とした場合、前記負極塗工部の高さ方向一端に位置し、かつ前記第１負極縁部側の縁部を負極塗工縁部とした場合、
    　前記負極塗工縁部は、前記負極タブ上にあり、かつ前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあり、
    　前記高さ方向への前記第１負極縁部から前記負極塗工縁部までの高さは０．５～２．０ｍｍであることを特徴とする蓄電装置。     A power storage device comprising an electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked in a state of being insulated from each other,
    The positive electrode includes a positive electrode current collector, and the positive electrode current collector includes a rectangular positive electrode main body, and a positive electrode tab having a shape protruding from a part of the first positive electrode edge of the positive electrode main body. And having a second positive electrode edge which is opposite to the first positive electrode edge of the positive electrode body,
    And a positive electrode coating portion formed by applying a positive electrode active material mixture on the surface of the positive electrode main body,
    When the direction in which a straight line connecting the first positive electrode edge portion and the second positive electrode edge portion is the shortest distance in the positive electrode electrode extends in the height direction, the positive electrode coating portion is located at one end in the height direction of the positive electrode coating portion; And the edge on the first positive electrode edge side is a positive electrode coated edge,
    The negative electrode includes a negative electrode current collector, and the negative electrode current collector includes a rectangular negative electrode main body, and a negative electrode tab having a shape protruding from a part of the first negative electrode edge of the negative electrode main body. And a second negative electrode edge portion opposite to the first negative electrode edge portion of the negative electrode main body portion, and a negative electrode coating portion formed by applying a negative electrode active material mixture on the surface of the negative electrode main body portion. Equipped with
    In the negative electrode, when the direction in which the straight line connecting the first negative electrode edge and the second negative electrode edge extends in the shortest distance is the height direction, it is located at one end in the height direction of the negative electrode coated portion When the edge on the side of the first negative electrode edge is a negative electrode coated edge,
    The negative electrode coating edge is on the negative electrode tab, and the position where the negative electrode tab extends beyond the positive electrode coating edge along the direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction In
    A power storage device characterized in that the height from the first negative electrode edge to the negative electrode coating edge in the height direction is 0.5 to 2.0 mm.
  6. 　前記負極タブは、前記第１負極縁部寄りの基端側から折り曲げられている請求項４又は請求項５に記載の蓄電装置。 The power storage device according to claim 4, wherein the negative electrode tab is bent from a base end side closer to the first negative electrode edge portion.
  7. 　前記正極電極は、前記第１正極縁部に沿って正極活物質合剤が塗布されず前記正極本体部の露出した正極未塗工部を備えるとともに、前記負極電極は、前記負極塗工縁部を前記負極タブ上に備え、前記電極組立体において前記負極塗工縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記正極塗工縁部を越えた位置にあり、前記第１負極縁部は、前記高さ方向に沿って前記負極タブが前記第１負極縁部から突出した方向に沿って前記第１正極縁部を越えた位置にある請求項１～請求項６のうちいずれか一項に記載の蓄電装置。 The positive electrode includes a positive electrode uncoated portion in which the positive electrode active material mixture is not applied along the first positive electrode edge and the exposed positive electrode main body is exposed, and the negative electrode is the negative electrode coated edge Is disposed on the negative electrode tab, and in the electrode assembly, the negative electrode coating edge is formed along the direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction. And the first negative electrode edge portion is a position where the negative electrode tab extends beyond the first positive electrode edge along a direction in which the negative electrode tab protrudes from the first negative electrode edge along the height direction. The power storage device according to any one of claims 1 to 6, wherein
  8. 　前記蓄電装置は二次電池である請求項１～請求項７のうちいずれか一項に記載の蓄電装置。 The power storage device according to any one of claims 1 to 7, wherein the power storage device is a secondary battery.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013175407A (en) * 2012-02-27 2013-09-05 Toyota Industries Corp Power storage device, vehicle
JP2015060796A (en) * 2013-09-20 2015-03-30 株式会社豊田自動織機 Method for manufacturing power storage device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013175407A (en) * 2012-02-27 2013-09-05 Toyota Industries Corp Power storage device, vehicle
JP2015060796A (en) * 2013-09-20 2015-03-30 株式会社豊田自動織機 Method for manufacturing power storage device

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