WO2019123588A1 - Dispositif de stockage d'énergie - Google Patents

Dispositif de stockage d'énergie 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
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English (en)
Japanese (ja)
Inventor
雅人 小笠原
厚志 南形
Original Assignee
株式会社 豊田自動織機
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Application filed by 株式会社 豊田自動織機 filed Critical 株式会社 豊田自動織機
Priority to PCT/JP2017/045846 priority Critical patent/WO2019123588A1/fr
Publication of WO2019123588A1 publication Critical patent/WO2019123588A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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, LIGHT-SENSITIVE OR TEMPERATURE-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.

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  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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Abstract

La présente invention concerne un dispositif de stockage d'énergie qui comprend un ensemble électrode dans lequel une pluralité d'électrodes positives et une pluralité d'électrodes négatives sont empilées en alternance et isolées les unes des autres. L'électrode positive comprend une zone revêtue d'électrode positive formée par application d'un matériau actif d'électrode positive sur la surface d'un corps d'électrode positive, et une zone non revêtue d'électrode positive sur laquelle le matériau actif d'électrode positive n'est pas appliqué avec le corps d'électrode positive exposé. La hauteur Hm de la zone non revêtue d'électrode positive dans l'électrode positive est supérieure à une tolérance x de la zone non revêtue d'électrode positive, et la plage où la hauteur Hm est supérieure à la tolérance x est inférieure ou égale à 1,0 mm.
PCT/JP2017/045846 2017-12-21 2017-12-21 Dispositif de stockage d'énergie WO2019123588A1 (fr)

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PCT/JP2017/045846 WO2019123588A1 (fr) 2017-12-21 2017-12-21 Dispositif de stockage d'énergie

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Application Number Priority Date Filing Date Title
PCT/JP2017/045846 WO2019123588A1 (fr) 2017-12-21 2017-12-21 Dispositif de stockage d'énergie

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WO2019123588A1 true WO2019123588A1 (fr) 2019-06-27

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013175407A (ja) * 2012-02-27 2013-09-05 Toyota Industries Corp 蓄電装置、車両
JP2015060796A (ja) * 2013-09-20 2015-03-30 株式会社豊田自動織機 蓄電装置の製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013175407A (ja) * 2012-02-27 2013-09-05 Toyota Industries Corp 蓄電装置、車両
JP2015060796A (ja) * 2013-09-20 2015-03-30 株式会社豊田自動織機 蓄電装置の製造方法

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