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WO2015001424A1 - Batterie rechargeable à électrolyte non aqueux et procédé de fabrication de cette dernière - Google Patents

Batterie rechargeable à électrolyte non aqueux et procédé de fabrication de cette dernière Download PDF

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Publication number
WO2015001424A1
WO2015001424A1 PCT/IB2014/001641 IB2014001641W WO2015001424A1 WO 2015001424 A1 WO2015001424 A1 WO 2015001424A1 IB 2014001641 W IB2014001641 W IB 2014001641W WO 2015001424 A1 WO2015001424 A1 WO 2015001424A1
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WO
WIPO (PCT)
Prior art keywords
section
electrode body
wound electrode
outer peripheral
peripheral surface
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2014/001641
Other languages
English (en)
Inventor
Fumitaka SHIMODATE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Primearth EV Energy Co Ltd
Original Assignee
Toyota Motor Corp
Primearth EV Energy Co Ltd
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 Toyota Motor Corp, Primearth EV Energy Co Ltd filed Critical Toyota Motor Corp
Publication of WO2015001424A1 publication Critical patent/WO2015001424A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/0468—Compression means for stacks of electrodes and separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a nonaqueous electrolyte secondary battery and a manufacturing method thereof.
  • a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery typically includes: a wound electrode body in which a long positive electrode sheet, a long negative electrode sheet, and a long separator sheet are superimposed and wound in a longitudinal direction; and a battery case for housing the wound electrode body.
  • the wound electrode body In a case where the rectangular parallelepiped battery case houses the wound electrode body, the wound electrode body is pressed to be flat, and the flat wound electrode body is housed in the battery case.
  • JP 10-302827 A discloses a square battery for which the flat wound electrode body is subjected to high-temperature compression molding before being inserted in the battery case, and in which the wound electrode body after the high-temperature compression molding is inserted in the battery case.
  • the wound electrode body is compressed (pressed) to be flat, a restoring force is generated by which the wound electrode body tries to return to its original shape.
  • the restoring force is too large, the positive and negative electrode sheets may partially be damaged.
  • JP 2002-245998 A discloses a technique to cover at least a portion of an outermost periphery of the flat wound electrode body with a resin tube. According to such a technique, a flat shape of the wound electrode body can be retained.
  • the present invention provides a nonaqueous electrolyte secondary battery in which a shape of a flat wound electrode body is retained and stress applied to the wound electrode body during the charging and discharging can be released, and a manufacturing method therefor.
  • a nonaqueous electrolyte secondary battery includes a flat wound electrode body and a retaining member.
  • the flat wound electrode body has a positive electrode sheet, a negative electrode sheet, and a separator sheet that are superimposed and wound in a longitudinal direction, and has a flat shape.
  • An outer peripheral surface of the. flat wound electrode hody in a winding direction includes a first straight section, a second straight section, a first rounded section, and a second rounded section.
  • the second straight section is opposed to the first straight section.
  • the first rounded section connects one end of the first straight section and one end of the second straight section.
  • the second rounded section is opposed to the first rounded section and connects another end of the first straight section and another end of the second straight section.
  • the retaining member is attached to the flat wound electrode body, so as to cover a rounded section outer peripheral surface of either one of the first rounded section and the second rounded section, a portion of an outer peripheral surface of the first straight section that is continuous with the rounded section outer peripheral surface, and a portion of an outer- .peripheraLsurface .of .the .second.. straight section that is continuous with the rounded section outer peripheral surface in the flat wound electrode body.
  • the retaining member has a U-shaped cross section and an insulating property.
  • the flat wound elec:rode body has an exposed region provided in the outer peripheral surface of the first straight section and the outer peripheral surface of the second straight section. The exposed region is a region uncovered with the retaining member.
  • nonaqueous electrolyte secondary battery refers to a battery that includes a nonaqueous electrolyte (typically, an electrolyte containing a supporting salt (supporting ectrolyte) in a nonaqueous solvent (organic solvent)).
  • a “secondary battery” refers to a general battery that can repeatedly be charged and discharged, and refers to a term that includes a so-called chemical battery such as a lithium ion secondary battery and a physical battery such as an electric double layer capacitor.
  • the retaining member which has the insulating property and covers the rounded section outer peripheral surface of either one of the first rounded section and the second rounded section in the flat wound electrode body, covers the portions of the outer peripheral surfaces of the first and second straight sections that are continuous with the rounded section outer peripheral surface. Accordingly, even when a restoring force that urges returning to an original shape is generated in the flat wound electrode body (the first rounded section and the second rounded section, for example), a shape of the flat wound electrode body is retained by the retaining member. Consequently, it is possible to prevent occurrence of failure such as cutting or the like of the positive and negative electrode sheets in the flat wound electrode body.
  • the exposed region that is not covered with the retaining member is formed in the outer peripheral surface of the first straight section and the outer peripheral surface of the second straight section.
  • the flat wound electrode body satisfies a following relationship 0.2 ⁇ b/c ⁇ 0.7.
  • c is a length of a whole periphery of the flat wound electrode body in the winding direction
  • b is a total length of the exposed region, which is not covered with the retaining member, of flat wound electrode body in the winding direction.
  • the stress can sufficiently be released from the portion that is not covered with the retaining member. Consequently, it is possible to suppress the generation of the wrinkle in the positive electrode sheet and the negative electrode sheet of the flat wound electrode body.
  • the retaining member may include a first retaining member, and second retaining member.
  • the first retaining member is attached to the flat wound electrode body.
  • the second retaining member is different from the first retaining member.
  • the second retaining member is attached to the flat wound electrode body.
  • the first retaining member may cover the rounded section outer peripheral surface of the first rounded section.
  • the second retaining member may cover the' rounded section outer peripheral surface of the second rounded section.
  • the exposed region may be provided in central regions in the outer peripheral surface of the first straight section and the outer peripheral surface of the second straight section, as seen along a winding axis direction of the flat wound electrode body, and the exposed region may be a region uncovered with the firsi: retaining member and the second retaining member. According to this configuration, the shape of the flat wound electrode body is retained by the retaining member, and the generation of the wrinkle in the positive electrode sheet and the negative electrode sheet of the flat wound electrode body is suppressed.
  • the flat wound electrode body may have a laminated section, in which the positive -electrode sheet,- the .negativje- electrGde_sheet,-and-lhe_ - - separator sheet are laminated and wound in a central section in a winding axis direction.
  • the flat wound electrode body may have a positive electrode side protruding section, in which a portion of the positive electrode sheet protrudes from the laminated section and is wound, at one end thereof in the winding axis direction.
  • the flat wound electrode body may have a negative electrode side protruding section, in which a portion of the negative electrode sheet protrudes from the laminated section and is wound, at another end thereof in the winding axis direction.
  • the retaining member is attached to the laminated section but is not attached to the positive electrode side protruding section and the negative electrode side protruding section. Most of the restoring force that is generated in the flat wound electrode body is generated in the laminated section. According to this configuration, since the retaining member is attached only to the laminated section, the shape of the flat wound electrode body is retained, and lightweight of the whole battery can be realized.
  • the retaining member may be attached to the entire laminated section in the winding axis direction. According to this configuration, the shape of the flat wound electrode body can be retained further stably.
  • the retaining member may be configured by a thermosetting resin. Since the thermosetting resin has a superior heat resistance property and a superior chemical resistance property, it is possible to exhibit the above effects while retaining performance of the nonaqueous electrolyte secondary battery.
  • a manufacturing method of a nonaqueous electrolyte secondary battery includes: producing a wound electrode body by superimposing and winding a positive electrode sheet, a negative electrode sheet, and a separator sheet in a longitudinal direction; pressing the wound electrode body in a perpendicular direction to a winding axis direction of the wound electrode body to produce a flat wound electrode body that has a first straight section, a second straight section, a first rounded section, and a second rounded section in an outer peripheral surface in a winding direction, the second straight section being opposed to the first straight section, the first rounded section connecting one end of the first straight section and one end of the second straight section, and the second rounded section being opposed to the first rounded section and the second rounded section connecting another end of the first straight section and another end of the second straight section; forming an exposed region in the outer peripheral surface of the first straight section and the outer peripheral surface of the second straight section that are not covered with a thermosetting resin by covering
  • thermosetting resin for covering the rounded section outer peripheral surface of either one of the first rounded section and the second rounded section and the portions of the outer peripheral surfaces of the first and second straight sections that are continuous with the rounded section outer peripheral surface in the flat wound electrode body, which is obtained by pressing the wound electrode body is heated to cure the thermosetting resin. Accordingly, even when the restoring force is generated in the flat wound electrode body, which is obtained by pressing the wound electrode body, the shape of the flat wound electrode body is retained by the cured thermosetting resin.
  • the restoring force that is generated in the flat wound electrode body is removed by pressing the wound electrode body for a long time or the like, and the shape of the wound electrode body is thereby retained.
  • the shape of the flat wound electrode body is retained by the thermosetting resin, which is attached to the flat wound electrode body, it is possible to reduce a time for pressing the wound electrode body.
  • a manufacturing method of a nonaqueous electrolyte secondary battery includes: producing a wound electrode body by superimposing and winding a positive electrode sheet, a negative electrode sheet, and a separator sheet in a longitudinal direction; covering a portion of an outer peripheral surface of the wound electrode body with a thermosetting resin; pressing the wound electrode body, which is covered with the thermosetting resin, in a perpendicular direction to a winding axis direction of the wound electrode body to produce a flat wound electrode body that has a first straight sectionra second straight section, a first rounded section, and a second rounded section in the outer peripheral surface in the winding direction, the second straight section being opposed to the first straight section, the first rounded section connecting one end of the first straight section and one end of the second straight section, the second rounded section being opposed to the first rounded section and the second rounded section connecting another end of-the-first straight section.
  • thermosetting resin having a U-shaped cross section, and the outer peripheral surface of the first straight section and the outer peripheral surface of the second straight section being each formed with an exposed region that is not covered with the thermosetting resin; and heating the thermosetting resin to cure the thermosetting resin.
  • the shape of the flat wound electrode body is retained by the cured thermosetting resin.
  • the shape of the flat wound electrode body is retained by the thermosetting resin, which is attached to the flat wound electrode body, it is possible to reduce a time for pressing the wound electrode body.
  • the flat wound electrode body satisfies a following relationship 0.2 ⁇ b/c ⁇ 0.7.
  • c is a length of a whole periphery of the flat wound electrode body in the winding direction
  • b is a total length of the exposed region of the flat wound electrode body in the winding direction that is not covered with the retaining member.
  • the stress can sufficiently be released from the portion that is not covered with the retaining member. Consequently, it is possible to obtain the nonaqueous electrolyte secondary battery in which generation of a wrinkle in the positive electrode sheet and the negative electrode sheet of the flat wound electrode body is suppressed.
  • FIG 1 is a perspective view for showing an outer shape of a nonaqueous electrolyte secondary battery according to one embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 ;
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2, and is a cross-sectional view for showing a structure of a flat wound electrode body according to the embodiment of the present invention
  • FIG. 4 is a schematic diagram for showing the structure of the wound electrode body according to the embodiment of the present invention.
  • FIG. 5 is a flowchart for illustrating a manufacturing method of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention
  • FIG. 6 is a flowchart for illustrating the manufacturing method of the nonaqueous electrolyte secondary battery according to another embodiment of the present invention.
  • FIG. 7 is a cross-sectional view for showing a structure of the flat wound electrode body with retaining members according to a first example
  • FIG. 8 is a cross-sectional view for showing the structure of the flat wound electrode body with the retaining member according to a second example
  • FIG. 9 is a cross-sectional view for showing the structure of the flat wound electrode body with the retaining members according to a third example
  • FIG. 10 is a cross-sectional view for showing the structure of the flat wound electrode body with the retaining member according to a fourth example
  • FIG. 11 is a cross-sectional view for showing the structure of the flat wound electrode body with the retaining member according to a fifth example.
  • FIG. 12 is a cross-sectional view for showing the structure of the flat wound electrode body without the retaining member according to a sixth example.
  • a manufacturing method of the lithium ion secondary battery (a nonaqueous electrolyte secondary battery) according to a first embodiment of the present invention includes a wound electrode body producing step (S10), a pressing step (S20), a covering step (S30), and a curing step (S40).
  • a long positive electrode sheet, a long negative electrode sheet, and a long separator sheet are superimposed and wound in a longitudinal direction to produce a wound electrode body.
  • the long positive electrode sheet of the lithium ion secondary battery according to the first embodiment has a long positive electrode collector and a positive electrode mixture layer formed on the positive electrode collector.
  • the positive electrode mixture layer includes a positive electrode active material, a conductive material, a binder, and the like.
  • a conductive member that is formed by a metal having favorable conductivity (aluminum, for example) can preferably be adopted.
  • a lithium composite metal oxide of a layered system, a spinel system, and (LiNiC% L1C0O2, LiFe0 2 , LiMn 2 0 4 , LiNii/3Coi 3Mn[/30 2 , LiNio.5Mn1.5O4, LiCrMnC ⁇ 4, LiFeP0 4 , and the like, for example) can preferably be adopted.
  • a carbon material such as carbon black (acetylene black and etjenblack, for example) can be adopted.
  • the binder various types of a polymer material such as polyvinylidene fluoride (PVDF) and polyethylene oxide (PEO) can be adopted.
  • the long negative electrode sheet of the lithium ion secondary battery according to the first embodiment has a long negative electrode collector and a negative electrode mixture layer formed on the negative electrode collector.
  • the negative electrode mixture layer includes a negative electrode active material, a binder, a thickener, and the like.
  • a conductive material that is formed by a metal having favorable conductivity (copper, for example) can preferably be adopted.
  • As the negative electrode active material a carbon material such as graphite, hardly graphitized carbon (hard carbon), and easily graphitized carbon (soft carbon) can be used, and of all, graphite can preferably be adopted.
  • As the binder various types of the polymer material such as styrene-butadiene rubber (SBR) can be adopted.
  • SBR styrene-butadiene rubber
  • the thickener various types of the polymer material such as carboxymethyl cellulose (CMC) can be adopted.
  • a conventionally known separator sheet can be used for the long separator sheet according to the first embodiment without any limitation.
  • a porous sheet formed of a resin fine porous resin sheet
  • a porous polyolefin resin sheet such as polyethylene (PE) and polypropylene (PP) is preferred.
  • PE polyethylene
  • PP polypropylene
  • a single layer PE sheet, a single layer PP sheet, a two-layer structure (PE PP structure) sheet in which a PE layer and a PP layer are laminated, a three-layer structure (PP/PE PP structure) sheet in which the PP layers are laminated on both sides of the PE layer, and the like can preferably be used.
  • FIG. 4 shows a wound electrode body 50 according to the first embodiment.
  • the wound electrode body 50 is produced by being wounded in the longitudinal direction in a state that a long positive electrode sheet 64 and a long negative electrode sheet 84- ⁇ re laminated with two long- separator sheets. 0 being interposed therebetween.
  • the positive electrode sheet 64 and the negative electrode sheet 84 are superimposed while being slightly displaced from each other in a width direction, so that a portion of the positive electrode sheet 64, in which the positive electrode mixture layer is not formed (that is, a portion in which a positive electrode mixture layer 66 is not formed and a positive electrode collector 62 is exposed), and a portion of the negative electrode sheet 84, in which the negative electrode mixture layer is not formed (that is, a portion in which a negative electrode mixture layer 86 is not formed and a negative electrode collector 82 is exposed), protrude from both sides of the each separator sheet 90 in the width direction.
  • the positive electrode sheet 64, the negative electrode sheet 84, and the separator sheets 90 are laminated to form a wound laminated section 52 in a central section of the wound electrode body 50 in a winding axis direction.
  • a portion of the positive electrode sheet 64 that is, a portion of the positive electrode collector 62 protrudes outward from the laminated section 52 and is wound to form a positive electrode side protruding section 63.
  • a portion of the negative electrode sheet 84 protrudes outward from the laminated section 52 and is wound to form a negative electrode side protruding section 83.
  • the wound electrode body 50 which is produced as above, is pressed and crushed in a lateral direction of the wound electrode body 50 (a perpendicular direction to the winding axis direction) to produce a flat wound electrode body 100 (see FIG. 3).
  • a time for pressing the thus-produced wound electrode body 50 differs according to a shape or the like of a thermosetting resin or the like- that covers- the flat wound electrode body 100, and is approximately 30 minutes to 250 minutes (preferably, 30 minutes to 50 minutes), for example.
  • FIG. 3 is a cross-sectional view that is perpendicular to the winding axis direction of the flat wound electrode body 100 (a perpendicular direction to the sheet of FIG. 3).
  • an outer peripheral surface 101 in a winding direction of the flat wound electrode body 100 has a first straight section 102, a second straight section 104, a first rounded section 106, and a second rounded section 108.
  • the flat wound electrode body 100 has the first straight section 102, the second straight section 104, the first rounded section 106, and the second rounded section 108 in the outer peripheral surface 101 in the winding direction of the flat wound electrode body 100.
  • the first straight section 102 is opposed to the second straight section 104.
  • the first rounded section 106 connects one end of the first straight section 102 and one end of the second straight section 104.
  • the second rounded section 108 is opposed to the first rounded section 106.
  • the second rounded section 108 conriects the other end of the first straight section 102 and the other end of the second straight section 104.
  • thermosetting resin a portion of the outer peripheral surface of the flat wound electrode body 100, which is produced as above, is covered with the thermosetting resin.
  • a conventionally known thermosetting resin can be used for the thermosetting resin according to this embodiment without any limitation.
  • a phenol resin, a melamine resin, an epoxy resin, cellulose, polyimide, or the like can preferably be used. From a perspective of moldability and acid resistance, polyimide-is preferably used.
  • a first thermosetting resin 110 having a U-shaped cross section covers a rounded section outer peripheral surface 107 of the first rounded section 106, a portion of an outer peripheral surface 103 of the first straight section 102, which is continuous with the rounded section outer peripheral surface 107, and a portion of an outer peripheral surface 105 of the second straight section 104, which is continuous with the rounded section outer peripheral surface 107.
  • a second thermosetting resin 112 having a U-shaped cross section covers a rounded section outer peripheral surface 109 of the- second rounded - section 108, -a -portion of- the outer peripheral surface 103 of the first straight section 102, which is continuous with the rounded section outer peripheral surface 109, and a portion of the outer peripheral surface 105 of the second straight section 104, which is continuous with the rounded section outer peripheral surface 109. Consequently, the outer peripheral surface 103 of the. first straight section 102 is formed with a first exposed region 103R that is not covered with the first thermosetting resin 110 or the second thermosetting resin 112.
  • the outer peripheral surface 105 of the second straight section 104 is formed with a second exposed region 105R that is not covered with the first thermosetting resin 110 or the second thermosetting resin 112.
  • the first exposed region 103R is formed in a central region of the outer peripheral surface 103 of the first straight section 102 when seen in the winding axis direction of the flat wound electrode body 100.
  • the second exposed region 105R is formed in a central region of the outer peripheral surface 105 of the second straight section 104 when seen in the winding axis direction of the flat wound electrode body 100.
  • the first thermosetting resin 110 and the second thermosetting resin 112 cover the laminated section 52 of the flat wound electrode body 100 (that is, are attached to the laminated section 52).
  • the first thermosetting resin 110 and the second thermosetting resin 112 are not attached to the positive electrode side protruding section 63 or the negative electrode side protruding section 83 in the flat wound electrode body 100. It is preferred that the first thermosetting resin 1 10 and the second thermosetting resin 112 are attached to the entire laminated section 52 in the winding axis direction (perpendicular direction to the sheet of FIG. 3).
  • portions covered with the first thermosetting resin 110 or the second thermosetting resin 112 are preferably adjusted such that b/c is 0.2 to 0.7 (for example, 0.25 ⁇ b/c ⁇ 0.625, and preferably, 0.25 ⁇ b/c ⁇ 0.375).
  • the rounded section outer peripheral surface 107 of the first rounded section 106 and the rounded section outer peripheral surface 109 of the second rounded section 108 are respectively covered with the first thermosetting resin 11 and the second thermosetting resin 112; however, the present invention is not limited to this embodiment.
  • a rounded section outer peripheral surface of either one of the rounded section outer peripheral surface 107 of the first rounded section 106 and the rounded section outer peripheral surface 109 of the second rounded section 108, a portion of the outer peripheral surface 103 of the first straight section 102, which is continuous with the rounded section outer peripheral surface, and a portion of the outer peripheral surface 105 of the second straight section 104, which is continuous with the rounded section outer peripheral surface, may be covered with the thermosetting resin having the U-shaped cross section.
  • thermosetting resin is preferably formed in a length to cover the central regions in the outer peripheral surface 103 of the first straight section 102 and the outer peripheral surface 105 of the second straight section 104 when the central regions are seen in the winding axis direction of the flat wound electrode body 100.
  • the curing step (S40) will be described.
  • the first thermosetting resin 1 10 and the second thermosetting resin 112 are heated to cure the first thermosetting resin 110 and the second thermosetting resin 1 12.
  • the curing step is carried out, for example, by fitting the flat wound electrode body 100, to which the first thermosetting resin 110 and the second thermosetting resin 112 are attached, in a heatable mold having a specified shape and by applying the heat to the first thermosetting resin 110 and the second thermosetting resin 112.
  • the curing step is carried out for approximately 30 minutes to 250 minutes (40 minutes, for example) under a temperature condition of 100°C to 150°C (120°C, for example).
  • the rounded section outer peripheral surface 107 of the first rounded section 106, the portion of the outer peripheral surface 103 of the first straight section 102, and the portion of the outer peripheral surface 105 of the second straight section 104 are covered with a first retaining member 111 that is configured by the first thermosetting resin 110, and the rounded section outer peripheral surface 109 of the second rounded section 108, the portion of the outer peripheral surface 103 of the first straight section 102, the portion of the outer peripheral surface 105 of the second straight section 104 are covered with a second retaining member 113 that is configured by the second thermosetting resin 112.
  • a positive electrode terminal 60 (made of aluminum, for example) is joined to the positive electrode side protruding section 63 of such a flat wound electrode body 100 through a positive electrode collector plate 61, so as to electrically connect the positive electrode sheet 64 of the above-mentioned flat wound electrode body 100 and the positive electrode terminal 60.
  • a negative electrode terminal 80 (made of nickel, for example) is joined to the negative electrode side protruding section 83 through a negative electrode collector plate 81, so as to electrically connect the negative electrode sheet 84 and the negative electrode terminal 80.
  • the positive and negative electrode terminals 60, 80 and the positive and negative electrode side protruding sections 63, 83 can respectively be joined to each other by ultrasonic welding, resistance welding, or the like, for example.
  • a battery case 15 of this embodiment is a metallic battery case (made of aluminum, for example) and includes a case body (outer case) 30 in a bottomed flat box shape (typically in a rectangular parallelepiped shape) with an opened upper end and a lid body 25 for closing an opening 20 of the case body 30.
  • An upper surface of the battery case 15 (that is, the lid body 25) is provided with the positive electrode terminal 60, which is electrically connected to the positive electrode sheet 64 of the flat wound electrode body 100, and the negative electrode terminal 80, which is electrically connected to the negative electrode sheet 84 of the flat wound electrode body 100.
  • the lid body 25 is formed with an injection port (not shown) through which a nonaqueous electrolyte, which will be described below, is injected into the case body 30 (battery case 15) that houses the flat wound electrode body 100.
  • the injection port is sealed by a sealing plug 48 after the nonaqueous electrolyte is injected.
  • the lid body 25 is provided with a safety valve 40 for discharging gas that is produced in the battery case 15 upon occurrence of abnormality in the battery to the outside of the battery case 15.
  • the flat wound electrode body 100 is housed in the case body 30 in such a posture that the winding axis of the flat wound electrode body 100 is set sideways (that is, the opening 20 is formed in a normal direction of the winding axis of the flat wound electrode body 100). Then, a lithium ion secondary battery (nonaqueous electrolyte secondary battery) 10 is produced by sealing the opening 20 of the case body 30 with the lid body 25. The lid body 25 and the case body 30 are joined by welding or the like.
  • an organic solvent that contains a supporting salt
  • a lithium salt, a sodium salt, or the like can be used, and particularly, the lithium salt such as LiPF 6 or L1BF4 can preferably be adopted.
  • an aprotic solvent of carbonates, esters, ethers, or the like can be used. Of them, carbonates, such as ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), or ethyl methyl carbonate (EMC) can preferably be adopted.
  • EC ethylene carbonate
  • DEC diethyl carbonate
  • DMC dimethyl carbonate
  • EMC ethyl methyl carbonate
  • the first retaining member 1 1 1 for covering the rounded section outer peripheral surface 107 of the first rounded section 106 in the flat wound electrode body 100 covers the portion of the outer peripheral surface 103 of the first straight section 102 and the portion of the outer peripheral surface 105 of the second straight section 104, both of which are continuous with the rounded section outer peripheral surface 107.
  • the first and second exposed regions 103R, 105R that are not covered with the first and second retaining members 111, 1 13 are respectively formed in the outer peripheral surface 103 of the first straight section 102 and the outer peripheral surface 105 of the second straight section 104.
  • the flat wound electrode body 100 when the flat wound electrode body 100 is repeatedly compressed and expanded by the charging and discharging of the lithium ion secondary battery 10, stress generated in the flat wound electrode body 100 is sufficiently released from the first and second exposed regions 103R, 105R. Consequently, generation of a wrinkle in the positive electrode sheet 64 and the negative electrode sheet 84 of the flat wound electrode body 100 is suppressed, and deposition of metallic lithium that is associated with increased resistance in the wrinkled portion is suppressed. Therefore, the lithium ion secondary battery 10 according to the first embodiment becomes highly reliable.
  • first and second retaining members 111, 1 13 are each configured by the thermosetting resin
  • another resin material that is moldable and has an insulating property may be used.
  • the photocurable resin is irradiated with light having a specified wavelength (typically, ultraviolet light) instead of heating in the curing step to form the retaining member in a specified shape.
  • first and second retaining members 1 11, 1 13 can be adopted as long as they are formed of a material having the insulating property, and they may be formed of, for example, ceramic, a thermoplastic resin with a relatively high melting point (a resin with a melting point of 150°C or above, for example), or the like.
  • the retaining members configured by any of these materials are used, the retaining members, each having the U-shaped cross section, are prepared in advance, and the first rounded section 106 and the second rounded- seetion 108 of the flat wound electrode body - 100 are fitted in the retaining members. Accordingly, the shape of the flat wound electrode body 100 is retained.
  • the manufacturing method of the lithium ion secondary battery (nonaqueous electrolyte secondary battery) according to a second embodiment includes a wound electrode body producing step (S50), a covering step (S60), a pressing step (S70), and a curing step (S80).
  • the wound electrode body producing step (S50) is same as the wound electrode body producing step (S10) according to the first embodiment
  • the curing step (S80) is same as the curing step (S40) according to the first embodiment. Thus, the description thereof will not be repeated.
  • thermosetting resin is attached to the portion of the outer peripheral surface of the wound electrode body 50 before the wound electrode body 50 is pressed
  • the pressing step (S70) will be described.
  • the wound electrode b3 ⁇ 4dy 50 covered with the thermosetting resin is pressed and crushed in the lateral direction (the perpendicular direction to the winding axis direction) to produce the flat wound electrode body 100 (see FIG. 3). More specifically, the wound electrode body 50 covered with the thermosetting resin is pressed in the perpendicular direction to the winding axis direction, so as to produce the flat wound electrode body 100 having the first straight section 102, the second straight section 104, the first rounded section 106, and the second rounded section 108 in the outer peripheral surface in the winding direction.
  • the wound electrode body 50 covered with the thermosetting resin is pressed such that the rounded section outer peripheral surface of either one of the first rounded section 106 and the second rounded section 108, the portion of the outer peripheral surface 103 of the first straight section 102 that is continuous with the rounded section outer peripheral surface, and the portion of the outer peripheral surface 105 of the second straight section 104 that is continuous with the rounded section outer peripheral surface are covered with the thermosetting resin having the U-shaped cross section, and that the first exposed region 103R and the second exposed region 105R that are not covered with the thermosetting resin are respectively formed in the outer peripheral surface 103 of the first straight section 102 and the outer peripheral surface 105 of the second straight section 104.
  • the lithium ion secondary battery that includes the thus-produced flat wound electrode body 100 exhibits the same effects as those of the lithium ion secondary battery 10 in the first embodiment.
  • a description will hereinafter be made on examples of the present invention; however, it is not intended that the-present invention is .limited .to .such. _ __ examples.
  • acetylene black (AB) as the conductive material, and PVDF as the binder were weighed such that a mass ratio thereof was 90:8:2, and these materials were dispersed in N-methyl-2-pyrrolidone (NMP) to prepare a paste-like composition for forming a positive electrode mixture layer.
  • NMP N-methyl-2-pyrrolidone
  • Natural graphite, SBR as the binder, and CMC as the thickener were weighed such that a mass ratio thereof was 98:1 :1, and these materials were dispersed in ion exchange water to prepare a paste-like composition for forming a negative electrode mixture layer.
  • the composition was applied onto the negative electrode collector (copper foil) of 10 ⁇ in thickness and dried, the pressing process was carried out to produce a negative electrode sheet A in which the negative electrode mixture layer whose density was 1.23 g/cm 3 was formed on the negative electrode collector.
  • a separator sheet A of a three-layer structure (three-layer structure of PP PE/PP) of 20 um in thickness, in which polypropylene layers were formed on both surfaces of a polyethylene layer, was prepared.
  • the thus-produced wound electrode body A was pressed and crushed in the lateral direction for a specified time, and the flat wound electrode body 100 was thereby produced (the pressing step).
  • the length c of the whole periphery (that is, the outermost periphery) in the winding direction of the flat wound electrode body 1 0 was 16 cm.
  • a flat wound electrode body 100A with retaining members in which retaining members 111 A, 113 A, each configured by the thermosetting resin, were attached to the above-mentioned flat wound electrode body 100 was produced. More specifically, a whole periphery of a rounded section outer peripheral surface 107A of a first rounded section 106A, a portion of an outer peripheral surface 103 A of a first straight section 102 A, and a portion of an outer peripheral surface 105 A of a second straight section 104A in the flat wound electrode body 100 were covered with a first thermosetting resin 110A having a U-shaped cross section. A length of 6 cm of the flat wound electrode body 100 in the winding direction was covered with the first thermosetting resin 11 OA.
  • thermosetting resin 112A having a U-shaped cross section. A length of 6 cm of the flat wound electrode body 100 in the winding direction was covered with the second thermosetting resin 112A.
  • the first straight section 102A had a gap of 2 cm between the first thermosetting resin 1 10A and the second thermosetting resin 112 A
  • the second straight section 104A had a gap of 2 cm between the first thermosetting resin 1 10A and the second thermosetting resin 112A.
  • b/c was 0.25.
  • Polyimide was used for the thermosetting resins.
  • the thermosetting resins were cured by heating the first and second thermosetting resins 110A, 112A at 120°C for 40 minutes to form retaining members 111A, 113 A.
  • the flat wound electrode body 100A with the retaining members after the heating was placed on a flat base to measure a thickness of a central section of the flat wound electrode body 100A in the longitudinal direction with the retaining members (a thickness after heating). Then, the flat wound electrode body 100A with the retaining members was left for 60 minutes, and the thickness of the central section of the flat wound electrode body 100A in the longitudinal direction with the retaining members after leaving (a thickness after leaving) was measured.
  • a return amount (%) is set as ⁇ (thickness after leaving) / (thickness after heating) ⁇ x 100, and a time for pressing the wound electrode body A in the pressing step was adjusted such that the return amount became 130% or less.
  • the return amount of the flat wound electrode body 100A with the retaining members was 130% or less when the wound electrode body A was pressed for 35 minutes in the pressing step.
  • Such a flat wound electrode body 100A with the retaining members was adopted for the flat wound electrode body with the retaining members according to the first example.
  • a flat wound electrode body 100B with a retaining member in which a retaining - member 1 1 IB configured by the thermosetting resin was attached to the above-mentioned flat wound electrode body 100 was produced. More specifically, the whole periphery of the rounded section outer peripheral surface 107A of the first rounded section 106 A, a portion of the outer peripheral surface 103 A of the first straight section 102A, and a portion of the outer peripheral surface 105 A of the second straight section 04A in the flat wound electrode body 100 were covered with a first thermosetting resin 110B having a U-shaped cross section.
  • a length of 10 cm of the flat wound electrode body 100 in the winding direction was covered with the first thermosetting resin 1 10B.
  • the total length b of a portion of the flat wound electrode body 100 that was not covered with the first thermosetting resin 110B in the winding direction of the flat wound electrode body 100 was 6 cm.
  • b/c was 0.375. It was confirmed that the return amount of the flat wound electrode body 100B with the retaining member was 130% or less when the wound electrode body A was pressed for 60 minutes in the pressing step.
  • Such a flat wound electrode body 100B with the retaining member was -adopted for the flat wound electrode body with the retaining member according to the second example.
  • a flat wound electrode body lOOC with retaining members was produced in which retaining members 111C, 113C, each configured by the thermosetting resin, were attached to the above-mentioned flat wound electrode body 100. More specifically, the flat wound electrode body lOOC with the retaining members was produced in the same manner as the flat wound electrode body 100A with the retaining members except that a length of 3 cm of the flat wound electrode body 100 in the winding direction was covered with a first thermosetting resin 110C, and that another length of 3 cm of the flat wound electrode body 100 in the winding direction was covered with a second thermosetting resin 112C.
  • the first straight section 102A had a gap of 5 cm between the first thermosetting resin 1 IOC and the second thermosetting resin 112C
  • the second straight section 104A had a gap of 5 cm between the first thermosetting resin HOC and the second thermosetting resin 1 12C.
  • b/c was 0.625.
  • the return amount of the flat wound electrode body lOOC with the retaining members was 130% or less when the wound electrode body A was pressed for 200 minutes in the pressing step.
  • Such a flat wound electrode body lOOC with the retaining members was adopted for the flat wound electrode body with the retaining members according to the third example.
  • a flat wound electrode body lOOD with a retaining member was produced in which a retaining member H ID configured by the thermosetting resin was attached to the above-mentioned flat wound electrode body 100. More specifically, the whole periphery of the rounded section outer peripheral surface 107A of the first rounded section 106A, the whole periphery of the outer peripheral surface 103 A of the first straight section 102A, the whole periphery of the rounded section outer peripheral surface 109A of the second rounded section 108A, and a portion of the outer peripheral surface 105 A of the second straight section 104 A in the flat wound electrode body 100 were covered with a first thermosetting resin HOD.
  • a length of 14 cm of the flat wound electrode body 100 in the winding direction was covered with the first thermosetting resin 110D.
  • the total length b of a portion of the flat wound electrode body 100 that was not covered with the first thermosetting resin HOD in the winding direction of the flat wound electrode body 100 was 2 cm.
  • the second straight section 104 A had a gap of 2 cm between one end and the other end of the first thermosetting resin 110D.
  • b/c was 0.125. It was confirmed that the return amount of the flat wound electrode body 100D with the retaining member was 130% or less when the wound electrode body A was pressed for 35 minutes in the pressing step.
  • Such a flat wound electrode body 100D with the retaining member was adopted for the flat wound electrode body with the retaining member according to the fourth example.
  • a flat wound electrode body 100E with a retaining member was produced in which a retaining member 11 IE configured by the thermosetting resin was attached to the above-mentioned - flat wound electrode body 100. More specifically, the whole periphery of the flat wound electrode body 100 was covered with a first thermosetting resin 110E. A length of 16 cm of the flat wound electrode body 100 in the winding direction was covered with the first thermosetting resin 11 OE. Here, b/c was 0. It was confirmed that the return amount of the flat wound electrode body 100E with the retaining member was 130% or less when the wound electrode body A was pressed for 35 minutes in the pressing step. Such a flat wound electrode body 100E with the retaining member was adopted for the flat wound electrode body with the retaining member according to the fifth example.
  • the flat wound electrode body in which the retaining member configured by the thermosetting resin was not attached to the flat wound electrode body 100 was adopted for the flat wound electrode body according to the sixth example.
  • b/c was 1. It was confirmed that the return amount of the flat wound electrode body 100 was 130% or less when the wound electrode body A was pressed for 420 minutes in the pressing step.
  • Such a flat wound electrode body 100 was adopted for the flat wound electrode body according to the sixth example.
  • the electrode terminal was joined to the end of each of the positive and negative electrode collectors in the flat wound electrode body with the retaining members according to the first example, which was produced as described above, and the flat wound electrode body and the nonaqueous electrolyte were housed in the battery case that was made of aluminum and had a height of 75 mm, a width of 120 mm, a depth of 15 mm, and a thickness of 1 mm, so as to produce a square-shaped lithium ion secondary battery according to the first example.
  • the nonaqueous electrolyte a mixed solvent of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) whose volume ratio was 3:4:3 and in which LiPF6 as the supporting salt was dissolved was used.
  • the concentration of LiPF 6 in the nonaqueous electrolyte was 1.1 moll/L.
  • the lithium ion secondary batteries according to the second example to the sixth example were produced in the same manner as the lithium ion secondary battery according to the first example except that the flat wound electrode bodies with the retaining member according to the second example to the fifth example and the flat wound electrode body according to the sixth example, which were produced as described above, were used.
  • the wrinkle wasjiot formedin the-flat-wound_ electrode body during the charging and discharging of the lithium ion secondary battery when the first exposed region, which was not covered with the retaining member, was formed on the outer peripheral surface of the first straight section, and the second exposed region, which was not covered with the retaining member, was formed on the outer peripheral surface of the second straight section in the flat wound electrode body.
  • the length of the whole periphery in the winding direction of the flat wound electrode body was set to c, and the total length of the portion of the flat wound electrode body in the winding direction that was not covered with the thermosetting resin (retaining member) was set to b. It was confirmed that the time for pressing the wound electrode body in the pressing step was reduced when b/c was 0.2 to 0.7 (for example, 0.25 to 0.625, and preferably, 0.25 to 0.375).

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  • Electric Double-Layer Capacitors Or The Like (AREA)
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Abstract

La présente invention se rapporte à une batterie rechargeable à électrolyte non aqueux qui comprend un corps d'électrode enroulé plat et un élément de retenue. L'élément de retenue est fixé au corps d'électrode enroulé plat de sorte à recouvrir une surface périphérique externe de section enroulée soit d'une première section enroulée, soit d'une seconde section enroulée, une partie d'une surface périphérique externe d'une première section droite qui est continue à la surface périphérique externe de section enroulée, et une partie d'une surface périphérique externe d'une seconde section droite qui est continue à la surface périphérique externe de section enroulée dans le corps d'électrode enroulé plat. Le corps d'électrode enroulé plat comprend une région exposée agencée dans la surface périphérique externe de la première section droite et la surface périphérique externe de la seconde section droite. La région exposée est une région non recouverte avec l'élément de retenue.
PCT/IB2014/001641 2013-07-03 2014-07-01 Batterie rechargeable à électrolyte non aqueux et procédé de fabrication de cette dernière Ceased WO2015001424A1 (fr)

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JP2013139870A JP2015015092A (ja) 2013-07-03 2013-07-03 非水電解液二次電池及びその製造方法

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JP7695638B2 (ja) * 2021-02-09 2025-06-19 株式会社Ｇｓユアサ 電極体、及び蓄電素子
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10302827A (ja) 1997-04-24 1998-11-13 Nec Corp 角型電池の電極群の製造方法
JP2002245998A (ja) 2001-02-13 2002-08-30 Toshiba Corp 電池パック及び電池
US20060099504A1 (en) * 2004-09-24 2006-05-11 Kim Kwang C Secondary battery
WO2008035165A2 (fr) * 2006-09-22 2008-03-27 Toyota Jidosha Kabushiki Kaisha Module de batterie, procédé de fabrication correspondant et véhicule équipé d'un tel module de batterie
JP2010097785A (ja) * 2008-10-16 2010-04-30 Nec Tokin Corp 密閉型電池
US20110287302A1 (en) * 2010-05-20 2011-11-24 Samsung Sdi Co., Ltd. Secondary battery

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10302827A (ja) 1997-04-24 1998-11-13 Nec Corp 角型電池の電極群の製造方法
JP2002245998A (ja) 2001-02-13 2002-08-30 Toshiba Corp 電池パック及び電池
US20060099504A1 (en) * 2004-09-24 2006-05-11 Kim Kwang C Secondary battery
WO2008035165A2 (fr) * 2006-09-22 2008-03-27 Toyota Jidosha Kabushiki Kaisha Module de batterie, procédé de fabrication correspondant et véhicule équipé d'un tel module de batterie
JP2010097785A (ja) * 2008-10-16 2010-04-30 Nec Tokin Corp 密閉型電池
US20110287302A1 (en) * 2010-05-20 2011-11-24 Samsung Sdi Co., Ltd. Secondary battery

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