WO2017057200A1 - Élément de stockage d'électricité et procédé de fabrication d'élément de stockage d'électricité - Google Patents

Élément de stockage d'électricité et procédé de fabrication d'élément de stockage d'électricité Download PDF

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Publication number
WO2017057200A1
WO2017057200A1 PCT/JP2016/078099 JP2016078099W WO2017057200A1 WO 2017057200 A1 WO2017057200 A1 WO 2017057200A1 JP 2016078099 W JP2016078099 W JP 2016078099W WO 2017057200 A1 WO2017057200 A1 WO 2017057200A1
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WIPO (PCT)
Prior art keywords
electrode body
joining
current collector
recesses
recess
Prior art date
Application number
PCT/JP2016/078099
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English (en)
Japanese (ja)
Inventor
好浩 山本
Original Assignee
株式会社Ｇｓユアサ
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Application filed by 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Priority to JP2017543217A priority Critical patent/JP6856024B2/ja
Publication of WO2017057200A1 publication Critical patent/WO2017057200A1/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
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H01G11/76—Terminals, e.g. extensions of 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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 including an electrode body and a current collector connected to the electrode body, and a method for manufacturing the same.
  • a power storage element such as a lithium ion secondary battery has an electrode body in which, for example, a positive electrode plate and a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate are stacked.
  • the electrode body has an end portion (for example, a converging portion) on which metal foil portions not coated with an active material are laminated, and a metal member called a current collector is connected to the converging portion, for example. Is done.
  • welding using vibration may be used.
  • a technique called ultrasonic bonding in which a vibration by an ultrasonic wave is applied in a state where the focusing portion and the current collector are overlapped to join the focusing portion and the current collector.
  • the uneven surface is provided on the joint surface of the current collecting member to the current collector foil laminated portion, and the current collector foil of the current collector foil laminated portion is provided in the concave portion of the uneven region.
  • the current collecting member and the current collector foil laminated portion are joined by ultrasonic joining.
  • Patent Document 1 describes that the above configuration can sufficiently obtain the bonding strength of the bonding portion between the electrode plate of the electrode laminate and the current collecting terminal that extracts current from the electrode plate.
  • the converging part of the electrode body and the current collector are joined using a joining technique involving vibration such as ultrasonic joining, the surface of the metal foil that forms the converging part is scraped off, so that a small metal piece May occur.
  • the metal piece generated in this way moves to the inside of the electrode body, for example, there is a risk of causing problems such as the occurrence of a fine short circuit inside the electrode body.
  • the present invention provides a power storage element in which an electrode body and a current collector are joined using a joining technique involving vibration, and a highly reliable power storage element and a method for manufacturing the same.
  • the purpose is to do.
  • a method for manufacturing a power storage element includes an electrode body formed by stacking electrode plates, and a current collector electrically connected to the electrode body And a current collector using a joining tool having a plurality of protrusions, and an end portion of the electrode body in a first direction intersecting with the stacking direction of the electrode plates, and the current collector
  • the joining step the overlapping portion of the end portion of the electrode body and the current collector is vibrated by the joining tool in the joining step so that the first recess And a second recess deeper than the first recess.
  • the power storage device is a power storage device including an electrode body formed by laminating electrode plates, and a current collector electrically connected to the electrode body,
  • the electrode body has a joining portion that is a portion where the end portion in the first direction intersecting the laminating direction of the electrode plate and the current collector is joined, and the joining portion is viewed from the laminating direction.
  • a plurality of recesses are formed side by side in the joining region, which is a region in the case where the plurality of recesses include a first recess and a second recess deeper than the first recess.
  • the second recess is formed at a position closer to the center of the electrode body than the first recess in the first direction.
  • the present invention it is possible to provide a power storage element in which an electrode body and a current collector are bonded using a bonding technique involving vibration, and a highly reliable power storage element and a method for manufacturing the power storage element.
  • FIG. 1 is a perspective view showing an outline of the internal structure of the energy storage device according to the embodiment.
  • FIG. 2 is a diagram showing a connection mode between the current collector and the negative electrode terminal according to the embodiment.
  • FIG. 3 is a perspective view illustrating a schematic configuration of the electrode body according to the embodiment.
  • FIG. 4 is a diagram illustrating an arrangement example of joint portions according to the embodiment.
  • FIG. 5 is a cross-sectional view showing an outline of a VV cross section in FIG.
  • FIG. 6 is a sectional view showing an outline of a VI-VI section in FIG.
  • FIG. 7 is a diagram illustrating an arrangement example of a plurality of concave portions formed in the joint portion according to the embodiment.
  • FIG. 8 is a perspective view showing a schematic configuration of a bonding tip used for bonding the electrode body and the current collector according to the embodiment.
  • FIG. 9A is a first diagram illustrating a part of the manufacturing process of the energy storage device according to the embodiment.
  • FIG. 9B is a second diagram illustrating a part of the manufacturing process of the energy storage device according to the embodiment.
  • FIG. 9C is a third diagram illustrating a part of the manufacturing process of the energy storage device according to the embodiment.
  • FIG. 10 is a diagram illustrating an arrangement example of a plurality of concave portions formed in the joint portion according to the first modification of the embodiment.
  • FIG. 11 is a diagram illustrating an arrangement example of a plurality of concave portions formed in the joint portion according to the second modification of the embodiment.
  • FIG. 12 is a perspective view showing an outline of the internal structure of a power storage element that does not include a clip.
  • a method for manufacturing a power storage element includes an electrode body formed by stacking electrode plates, and a current collector electrically connected to the electrode body And a current collector using a joining tool having a plurality of protrusions, and an end portion of the electrode body in a first direction intersecting with the stacking direction of the electrode plates, and the current collector
  • the joining step the overlapping portion of the end portion of the electrode body and the current collector is vibrated by the joining tool in the joining step so that the first recess And a second recess deeper than the first recess.
  • the end of the electrode body and the current collector are joined by vibration by a joining tool having a plurality of protrusions.
  • a relatively shallow first recess and a relatively deep second recess are formed in the overlapping portion between the end of the electrode body and the current collector. Therefore, even when a minute metal piece (hereinafter also referred to as “foreign matter”) is generated when the first recess is formed, the movement of the foreign matter is regulated by the second recess formed deeper. .
  • the method for manufacturing a power storage element according to this aspect is a manufacturing method including a bonding step of bonding an electrode body and a current collector using a bonding technique involving vibration. According to this manufacturing method, it is possible to manufacture a power storage element having a structure that suppresses the movement of foreign matter generated in the joining process. Therefore, according to the manufacturing method according to this aspect, a highly reliable power storage element can be manufactured.
  • the joining step includes an overlapping portion of the end portion of the electrode body and the current collector by one or more of the plurality of protrusions.
  • the electrode body is formed by a first step of forming one or more of the second recesses by vibrating, and one or more other projections of the plurality of projections after the first step is started. It is good also as including the 2nd process of forming one or more above-mentioned 1st crevices by oscillating the overlap part of the above-mentioned end and the above-mentioned current collector.
  • the vibration by the one or more protrusions is started before the vibration by the one or more other protrusions (second process). Therefore, the foreign matter generated in the second step is regulated by the portion joined by the first step already started or the portion being joined. That is, the movement of the foreign matter generated in the joining process is suppressed.
  • the plurality of protrusions include a first protrusion and a second protrusion, and the protrusion disposition surface of the second protrusion on which the plurality of protrusions are disposed.
  • the height of the first projection is higher than the height of the first projection from the projection arrangement surface.
  • the joining tool is formed by overlapping the end portion of the electrode body and the current collector.
  • the second step by the first protrusion may be started after the start of the first step by the second protrusion.
  • the first step and the second step can be started in this order.
  • a welding tool that vibrates in the horizontal direction is moved vertically with respect to a portion where the end of the electrode body and the current collector are overlapped, thereby providing a single piece having a plurality of portions with different joining timings.
  • a junction can be formed.
  • the portion where the joining is started first functions as an element that hinders the movement of the foreign matter caused by the joining started later, and as a result, the reliability of the storage element is improved.
  • the power storage device is a power storage device including an electrode body formed by laminating electrode plates, and a current collector electrically connected to the electrode body,
  • the electrode body has a joining portion that is a portion where the end portion in the first direction intersecting the laminating direction of the electrode plate and the current collector is joined, and the joining portion is viewed from the laminating direction.
  • a plurality of recesses are formed side by side in the joining region, which is a region in the case where the plurality of recesses include a first recess and a second recess deeper than the first recess.
  • the second recess is formed at a position closer to the center of the electrode body than the first recess in the first direction.
  • the first concave portion and the second concave portion deeper than the first concave portion are formed in the joint portion, which is a portion where the end portion of the electrode body and the current collector are joined.
  • the joint having this structure is formed, for example, by vibration with a tool having at least two protrusions having different heights. That is, even when a foreign matter is generated when the portion corresponding to the first recess formed relatively shallowly, the movement of the foreign matter is a portion corresponding to the second recess formed relatively deep.
  • the one or more second recesses are arranged at a position closer to the center of the electrode body than the first recess, the center of the electrode body of the foreign matter generated in the joining of the portions corresponding to the first recesses Directional movement can be suppressed. That is, the possibility that foreign matter generated during the formation of the joint portion reaches the inside of the electrode body is further reduced.
  • the power storage device is a power storage device including the joined electrode body and the current collector, and movement of the foreign matter is suppressed even when foreign matter is generated in the joining process. It is an electrical storage element which has a structure. Therefore, the power storage element according to this embodiment is a highly reliable power storage element.
  • the plurality of recesses are arranged in a dispersed manner in the joining region, and the second recesses are provided along at least a part of the outer periphery of the joining region. It may be arranged.
  • the portion of the foreign matter generated inside the joining region having a two-dimensional extension is moved relatively deeply outside the joining region and is recessed along the outer periphery of the joining region. (Parts corresponding to the plurality of second recesses) can be efficiently suppressed.
  • a plurality of the second recesses may be arranged along the outer periphery so as to surround one or more of the first recesses.
  • the joint includes a portion of the pad disposed along the end of the electrode body and joined to the end, and the plurality of recesses May be formed on the pad.
  • each of the embodiments and modifications thereof described below shows one specific example of the present invention.
  • the shapes, materials, constituent elements, arrangement positions and connecting forms of constituent elements, order of manufacturing steps, and the like shown in the following embodiments and modifications thereof are merely examples, and are not intended to limit the present invention.
  • constituent elements that are not described in the independent claims indicating the highest concept are described as arbitrary constituent elements.
  • FIG. 1 is a perspective view showing an outline of the internal structure of a power storage device 10 according to the embodiment.
  • FIG. 1 is a diagram in which a part of a battery container 100 described later is omitted in order to illustrate the internal structure of the electricity storage element 10.
  • FIG. 2 is a diagram illustrating a connection mode between the current collector 140 and the negative electrode terminal 300 according to the embodiment.
  • the electricity storage element 10 is a secondary battery that can charge and discharge electricity, for example, a non-aqueous electrolyte secondary battery.
  • a non-aqueous electrolyte secondary battery examples include a lithium ion secondary battery in which the positive electrode active material is a lithium transition metal oxide such as lithium cobaltate and the negative electrode active material is a carbon material.
  • the kind of electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a primary battery may be sufficient.
  • the power storage element 10 may be a capacitor such as a lithium ion capacitor. Further, the power storage element 10 may be a primary battery that can use the stored electricity without being charged by the user.
  • the power storage device 10 includes a battery container 100, a positive electrode terminal 200, and a negative electrode terminal 300.
  • the battery container 100 includes a main body 101 having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid plate 110 that closes an opening of the main body 101.
  • the battery container 100 has a structure in which after the electrode body 120 and the like are accommodated therein, the lid plate 110 and the main body 101 are welded to seal the inside.
  • the positive electrode terminal 200 is attached to the lid plate 110 of the battery container 100 via a gasket 230 for maintaining the airtightness of the battery container 100.
  • the negative electrode terminal 300 is also attached to the lid plate 110 of the battery container 100 via the gasket 330.
  • Each of the gaskets 230 and 330 is formed of, for example, an insulating resin, and an electrical connection between the metal positive electrode terminal 200 and the negative electrode terminal 300 and the metal battery container 100 (cover plate 110). It also has a role of proper insulation.
  • an electrode body 120 is accommodated inside the battery container 100, and a positive current collector 130 and a negative current collector 140 are disposed. Yes.
  • a liquid such as an electrolytic solution is sealed in the battery container 100 of the power storage element 10, but the liquid is not shown.
  • the current collector 130, the current collector 140, and the lid plate 110 are also interposed between the current collector 130 and the current collector 140 and the lid plate 110.
  • An insulating gasket (lower gasket) is arranged.
  • the electrode body 120 includes a positive electrode plate, a negative electrode plate, and a separator, and is a member that can store electricity, and is formed to have an oval shape as a whole. Details of the electrode body 120 will be described later with reference to FIG.
  • the current collector 130 is a metal member connected to the positive electrode terminal 200 and the electrode body 120.
  • As the material of the current collector 130 for example, aluminum or an aluminum alloy that is the same material as the positive electrode of the electrode body 120 is employed.
  • the current collector 130 has a pair of long connection plate portions 132 connected to the electrode body 120.
  • the current collector 140 is a metal member connected to the negative electrode terminal 300 and the electrode body 120.
  • As the material of the current collector 140 for example, copper or a copper alloy that is the same material as the negative electrode of the electrode body 120 is employed.
  • the current collector 140 has a pair of long connection plate portions 142 connected to the electrode body 120.
  • the positive electrode terminal 200 and the current collector 130 are connected by caulking in the present embodiment.
  • the negative electrode terminal 300 and the current collector 140 are connected by caulking.
  • the negative electrode terminal 300 has a rivet portion 305.
  • the rivet portion 305 passes through the gasket 330, the cover plate 110 (see FIG. 1), and a lower gasket (not shown), and is inserted into a through hole 141a provided in the terminal connection portion 141 of the current collector 140.
  • the tip of the rivet portion 305 is caulked.
  • the negative electrode terminal 300 and the current collector 140 are connected.
  • the positive electrode terminal 200 is connected to the current collector 130 by caulking the rivet portion of the positive electrode terminal 200.
  • each of current collector 130 and current collector 140 and electrode body 120 are connected by ultrasonic bonding, which is an example of a bonding technique involving excitation, in the present embodiment. Has been.
  • Electrode body 120 has a converging portion in which an uncoated portion, which is a portion where no active material is coated on the electrode plate, is laminated on an end portion in the winding axis direction (X-axis direction in the present embodiment).
  • the electrode body 120 includes a converging part 136 in which an uncoated part 122 a of a positive electrode plate is laminated and a converging part 126 in which an uncoated part 123 a of a negative electrode plate is laminated. And have.
  • Each of the converging part 136 and the converging part 126 is an example of an end of the electrode body 120 in the first direction (in the present embodiment, the X-axis direction) intersecting with the electrode plate stacking direction.
  • the electrode body 120 is a wound electrode body, and on the positive electrode side, two converging portions 136 are arranged in the thickness direction (Y-axis direction in the present embodiment) across the winding shaft. Is formed. Similarly, on the negative electrode side of the electrode body 120, two converging portions 126 are formed in the thickness direction with the winding axis interposed therebetween.
  • connection plate portion 132 of the current collector 130 is joined to each of the two converging portions 136, and the connection plate portion 142 of the current collector 140 is joined to each of the two converging portions 126.
  • the current collector 140 will be described by focusing on the current collector 140.
  • the current collector 140 is disposed so that the pair of connection plate portions 142 sandwich the end portion of the electrode body 120 on the negative electrode side. In this state, each of the pair of connection plate portions 142 and the converging portion 126 are joined by ultrasonic joining.
  • connection plate part 142 At the time of this connection, the plurality of uncoated parts 123a constituting the converging part 126 joined to the connection plate part 142 are gathered near the center in the stacking direction, for example, and connected and pressed while being vibrated. 142.
  • the electrical storage element 10 has a joined portion that is a portion where the ends (the converging portions 136 and 126) of the electrode body 120 and the current collectors (130 and 140) are vibrated and joined. 160 is formed.
  • the joint 160 is formed with a plurality of recesses 170, and at least one of the plurality of recesses 170 is formed deeper than one or more other recesses 170.
  • the junction 160 included in the power storage element 10 according to the present embodiment will be described later with reference to FIGS. 4 to 9C.
  • the end portions (the converging portions 136 and 126) of the electrode body 120 and the current collectors 130 and 140 are joined by using a clip which is an example of a patch.
  • a clip which is an example of a patch.
  • one clip 150 is disposed on each of the pair of connection plate portions 132 of the current collector 130 and the pair of connection plate portions 142 of the current collector 140.
  • connection plate 142 Referring to one connection plate 142, the description will be made with one clip 150 arranged so as to sandwich the converging portion 126 and the connection plate 142 of the electrode body 120. That is, the connection plate portion 142 and the converging portion 126 are joined to each other by applying ultrasonic vibration while being pressed while the connection plate portion 142 and the converging portion 126 are sandwiched between the clips 150.
  • the clip 150 is a metal member that is used as an auxiliary so that the converging part 136 (126) formed by stacking the metal foils is not damaged by vibration caused by ultrasonic waves.
  • the clip 150 also has a role as a member that collects these elements to be joined when the converging part 136 (126) and the connecting plate part 132 (142) are joined.
  • the clip 150 attached to the current collector 130 on the positive electrode side for example, aluminum that is the same material as the positive electrode of the electrode body 120 or an aluminum alloy is employed.
  • a material of the clip 150 attached to the negative electrode side current collector 140 for example, copper or a copper alloy which is the same material as the negative electrode of the electrode body 120 is employed.
  • the clip 150 is a member used auxiliary as described above, and is not essential for joining the electrode body 120 and the current collectors 130 and 140.
  • the converging part 126 and the connecting plate part 142 are vibrated while directly applying a bonding chip (described later) to either the converging part 126 of the electrode body 120 or the connecting plate part 142 of the current collector 140. It may be joined.
  • FIG. 3 is a perspective view showing a schematic configuration of the electrode body 120 according to the embodiment.
  • the electrode body 120 is an example of an electrode body formed by winding an electrode plate.
  • the electrode body 120 is formed by alternately stacking and winding the positive electrode plate 122 and the negative electrode plate 123 and the two separators 124 and 125. Yes.
  • the electrode body 120 is formed by laminating the positive electrode plate 122, the separator 124, the negative electrode plate 123, and the separator 125 in this order and winding the cross section into an oval shape. Yes.
  • the electrode body 120 has a flat shape having a curved portion and a straight portion as shown in FIG. Specifically, the electrode body 120 includes a linear portion (pole) between the upper and lower curved portions in FIG. 3 (the portions where the electrode plates are turned on the positive and negative sides in the Z-axis direction) and the upper and lower curved portions. The plate is parallel to the Z-axis direction).
  • the positive electrode plate 122 is obtained by forming a mixture layer containing a positive electrode active material on the surface of a long metal foil made of aluminum.
  • a positive electrode active material contained in the mixture layer of the positive electrode plate 122 for example, LiMPO 4 , LiMSiO 4 , LiMBO 3 (M is one or more selected from Fe, Ni, Mn, Co, etc.) Polyanion compounds such as transition metal elements), spinel compounds such as lithium titanate and lithium manganate, LiMO 2 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), etc. Lithium transition metal oxide or the like can be used.
  • the negative electrode plate 123 is obtained by forming a mixture layer including a negative electrode active material layer on the surface of an elongated metal foil made of copper.
  • a known material can be used as appropriate as long as it is a negative electrode active material capable of occluding and releasing lithium ions.
  • lithium metal lithium metal, lithium alloys (lithium metal-containing alloys such as lithium-aluminum, lithium-silicon, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloys), as well as occlusion of lithium ⁇ Releasable alloys, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), metal oxides, lithium metal oxides (Li 4 Ti 6 O 12 etc.) And polyphosphoric acid compounds.
  • lithium metal lithium alloys
  • lithium metal-containing alloys such as lithium-aluminum, lithium-silicon, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloys
  • carbon materials eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon
  • the positive electrode plate 122 and the negative electrode plate 123 are wound while being shifted from each other in the winding axis direction via the separators 124 and 125.
  • the positive electrode plate 122 and the negative electrode plate 123 have the uncoated part which is a part in which the active material is not coated in the edge part of each shifted direction.
  • the uncoated part is also called, for example, “mixture layer non-formed part”.
  • the positive electrode plate 122 has the converging part 136 in which the uncoated part 122a not coated with the positive electrode active material is laminated at one end in the winding axis direction.
  • the negative electrode plate 123 has the converging portion 126 in which the uncoated portion 123a not coated with the negative electrode active material is laminated on the other end in the winding axis direction.
  • the power storage element 10 having the above-described configuration has a feature in the joint portion 160 that is a joint portion between the electrode body 120 and the current collectors 130 and 140. Further, in the present embodiment, the shape and attachment of negative side members (negative electrode terminal 300, current collector 140, clip 150, etc.) and positive side members (positive electrode terminal 200, current collector 130, clip 150, etc.) The structure and the like are substantially the same. Therefore, paying attention to the joint 160, which is a part where the electrode body 120 and the current collector 140 are joined, the characteristics of the structure and the like will be described with reference to FIGS. 4 to 9C.
  • FIG. 4 is a diagram illustrating an arrangement example of the joint 160 according to the embodiment.
  • the clip 150 and the like are not shown.
  • FIG. 5 is a cross-sectional view showing an outline of a VV cross section in FIG.
  • FIG. 6 is a sectional view showing an outline of a VI-VI section in FIG.
  • FIG. 7 is a diagram illustrating an arrangement example of the plurality of concave portions 170 formed in the joint portion 160 according to the embodiment.
  • a circular region with a thin dot represents the first concave portion 170a
  • a circular region with a dark dot represents the second concave portion 170b. This also applies to FIGS. 10 and 11 described later.
  • the electricity storage device 10 includes a joint portion 160 that is a portion where the converging portion 126 that is an end portion of the electrode body 120 and the current collector 140 are joined by vibration.
  • a joint portion 160 that is a portion where the converging portion 126 that is an end portion of the electrode body 120 and the current collector 140 are joined by vibration.
  • two portions in the longitudinal direction of the connection plate portion 142 that is long in the Z-axis direction are joined to the converging portion 126 of the electrode body 120.
  • two connecting portions 160 are formed per one connecting plate portion 142.
  • the number of the joint portions 160 is not particularly limited, and one or three or more joint portions 160 may be formed for one connection plate portion 142.
  • a plurality of recesses 170 are formed in the bonding region 165, which is a region when the bonding portion 160 is viewed from the electrode stacking direction (Y-axis direction in the present embodiment). Are formed side by side. More specifically, in the present embodiment, the converging portion 126 is vibrated by a joining tip (described later with reference to FIG. 8) via the clip 150. Therefore, a plurality of concave portions 170 are formed side by side in the bonding region 165 that is a region when the bonding portion 160 is viewed from the converging portion 126 side (Y-axis direction plus side). In addition, the joining area
  • the plurality of recesses 170 formed in the joint 160 include a first recess 170a and a second recess 170b deeper than the first recess 170a. That is, when the depth of the first recess 170a is D1, and the depth of the second recess 170b is D2, D2> D1. Moreover, D2: D1 is about 5: 4, for example.
  • the joint 160 having this structure is formed by vibration with a joining tip having at least two protrusions having different heights. That is, for example, the joining of the part corresponding to the second recessed part 170b is started before the joining of the part corresponding to the first recessed part 170a. Therefore, when a minute metal piece (hereinafter also referred to as “foreign matter”) is generated at the time of joining the portion corresponding to the first concave portion 170a, the movement of the foreign matter is restricted by the portion corresponding to the second concave portion 170b. receive. Further, for example, even when the vibration is started in a state where the joining tip is pressed against the overlapping portion of the converging portion 126 and the current collector 140, the second portion formed relatively deeply.
  • the concave portion 170b and the portion immediately below the concave portion 170b exist as a wall that suppresses the movement of the foreign matter generated when the first concave portion 170a is formed.
  • the metal may be ionized when a minute metal piece that is a foreign substance comes into contact with the positive electrode plate 122 of the electrode body 120.
  • the metal precipitates to form dendrite, and this dendrite penetrates the separator 125 to form a fine particle between the positive electrode plate 122 and the negative electrode plate 123. May cause a short circuit.
  • the movement of the foreign matter generated in the process of forming the joint 160 is suppressed by a part of the joint 160. Therefore, the possibility of occurrence of problems such as the fine short circuit is reduced.
  • the power storage element 10 according to the present embodiment is a power storage element 10 having a structure in which the movement of the foreign matter is suppressed even when the foreign matter is generated in the joining process. Therefore, the power storage element according to this aspect is a highly reliable power storage element 10.
  • the joint 160 has 15 recesses 170 arranged in a dispersed manner in the joint region 165.
  • a plurality (12 in this embodiment) of second recesses 170b are arranged along the outer periphery of the joining region 165 so as to surround one or more (three in this embodiment) first recesses 170a. ing.
  • the second recess 170b is located on the outermost side in the joining region 165
  • the first recess 170a is located on the inner side of the second recess 170b in the joining region 165.
  • the joint 160 when the joint 160 is viewed from the stacking direction (Y-axis direction), the second recess 170b deeper than the first recess 170a formed inside is formed at the end of the joint region 165. Progress of foreign matter generated inside the region 165 to the outside of the joining region 165 is suppressed.
  • a plurality of second recesses 170b are arranged along the outer periphery of the joining region 165 so as to surround one or more (three in the present embodiment) first recesses 170a. According to this configuration, it is possible to suppress progression of almost all foreign matters generated inside the joining region 165 to the outside of the joining region 165.
  • the one or more second recesses 170b are arranged in the first direction (X-axis direction).
  • the first recessed portion 170a is formed closer to the center of the electrode body 120.
  • the joint 160 configured in this way is formed by performing the manufacturing process shown in FIGS. 9A to 9C using, for example, the joining chip 520 shown in FIG.
  • FIG. 8 is a perspective view showing a configuration outline of a bonding tip 520 used for bonding the electrode body 120 and the current collector 140 according to the embodiment.
  • FIG. 9A is a first diagram illustrating a part of the manufacturing process of the electricity storage device 10 according to the embodiment
  • FIG. 9B is a second diagram illustrating a part of the manufacturing process
  • FIG. It is a 3rd figure which shows a part of the said manufacturing process.
  • the joining chip 520 shows the IX-IX cross section shown in FIG. 8, and the converging part 126, the connecting plate part 142, and the clip 150 correspond to the IX-IX cross section.
  • a cross section of the position is shown.
  • the dot area shown below the protrusion 530 represents a main area in which interface bonding by the vibration by the protrusion 530 is in progress or has been completed. .
  • the joining tip 520 used for joining the electrode body 120 and the current collector 140 is an example of a joining tool. As shown in FIGS. 8 and 9A, the first protrusion 530a and the second protrusion 530a having different heights are used. A projection arrangement surface 521 on which a plurality of projections 530 including the projection 530b are arranged is provided.
  • 15 protrusions 530 are arranged in a rectangular arrangement region 525 on the protrusion arrangement surface 521.
  • the twelve second protrusions 530b arranged along the outer periphery of the arrangement area 525 so as to surround the first protrusions 530a rather than the three first protrusions 530a arranged inside the arrangement area 525. high. That is, when the height of the first protrusion 530a is H1, and the height of the second protrusion 530b is H2, H2> H1.
  • H2: H1 is about 5: 4, for example.
  • the reference for the height of the protrusion 530 is the protrusion arrangement surface 521.
  • the method for manufacturing power storage element 10 includes a bonding step of bonding focusing portion 126 of electrode body 120 and current collector 140 using bonding chip 520 having a plurality of protrusions 530. .
  • the overlapping portion of the end portion (the converging portion 126) of the electrode body 120 and the current collector 140 is vibrated by the bonding tip 520, so that the first recess 170a and the first A second recess 170b deeper than the recess 170a is formed.
  • a relatively shallow first concave portion 170a and a relatively deep second concave portion 170b are formed in the overlapping portion of the converging portion 126 and the current collector 140. Therefore, even when a foreign substance is generated when the first concave portion 170a is formed, the movement of the foreign substance is restricted by the second concave portion formed deeper and a portion immediately below the second concave portion. Therefore, for example, the occurrence of problems such as a fine short circuit caused by the movement of foreign matter into the electrode body 120 is suppressed.
  • power storage device 10 having a structure in which the movement of the foreign material can be suppressed even when a foreign material is generated in the joining process. it can. Therefore, according to the method for manufacturing power storage element 10 according to the present embodiment, highly reliable power storage element 10 can be manufactured.
  • the bonding step according to the present embodiment is performed by exciting the overlapping portion of the converging portion 126 and the current collector 140 by one or more of the plurality of protrusions 530.
  • the bonding tip 520 is attached to the tip of a horn 510 provided in the ultrasonic bonding machine. Further, the overlapping portion of the converging portion 126 of the electrode body 120 and the connecting plate portion 142 of the current collector 140 is disposed on an anvil (not shown). In the present embodiment, as shown in FIG. 9A, the overlapped portion is arranged in a state of being covered by the clip 150.
  • the bonding tip 520 approaches the bonding target including the overlapping portion.
  • the second protrusion 530b having a higher height is to be joined (directly) before the first protrusion 530a.
  • the joining of the part corresponding to the second protrusion 530b is started before the joining of the part corresponding to the first protrusion 530a.
  • the first protrusion 530a reaches the object to be joined, and the joining of the portion corresponding to the first protrusion 530a to be joined is started, and the joining process for the object to be joined is completed as shown in FIG. 9C. That is, the joint 160, which is a portion where the converging portion 126 of the electrode body 120 and the current collector 140 are joined by vibration, is formed.
  • the plurality of protrusions 530 included in the bonding chip 520 include the first protrusion 530a and the second protrusion 530b, and the height of the second protrusion 530b from the protrusion arrangement surface 521 is The height of the first protrusion 530a from the protrusion arrangement surface 521 is higher.
  • the joining tip 520 is moved toward the overlapping portion of the converging portion 126 of the electrode body 120 and the current collector 140, so that the first step by the second protrusion 530b is started.
  • the second step by the one protrusion 530a is started.
  • One joint 160 having the same can be formed. Thereby, in one joint part 160, the part where joining was started first functions as an element which inhibits the movement of the foreign material produced by joining started later.
  • one bonding portion 160 having a structure that suppresses the movement of foreign matter can be formed by the vertical movement of one bonding chip 520 that vibrates by ultrasonic energy. Thereby, the highly reliable electrical storage element 10 can be manufactured efficiently.
  • a minute metal piece that is a foreign object is generated by rubbing adjacent metal foils of the converging portion 126 included in a region immediately below the first protrusion 530a.
  • the adjacent metal foils of the converging portion 126 immediately below the second protrusion 530b are already joined or being joined by the vibration by the second protrusion 530b. Therefore, the foreign matter generated in the region immediately below the first protrusion 530a is unlikely to move beyond the region immediately below the second protrusion 530b.
  • the vibration may be started in a state where the bonding tip 520 is pressed against the overlapping portion of the converging unit 126 and the current collector 140. That is, the joining of the portion corresponding to the first recess 170a by the first protrusion 530a and the joining of the portion corresponding to the second recess 170b by the second protrusion 530b may be started simultaneously or substantially simultaneously. Even in this case, it is difficult for the foreign matter generated during the formation of the relatively shallow first recess 170a to move beyond the second recess 170b that is formed relatively deep and directly below the second recess 170b.
  • the power storage device 10 manufactured by the above manufacturing method corresponds to the first recess 170a corresponding to the first protrusion 530a and the second protrusion 530b in the joint 160.
  • a plurality of recesses 170 including the second recesses 170b are formed.
  • the power storage element 10 having the joint 160 in which the plurality of recesses 170 are formed suppresses the movement of the foreign matter generated in the joining process to the outside of the joint 160 in the manufacturing process. ing. Further, even when the power storage element 10 is used after manufacturing, the movement of foreign matter remaining inside the joint 160 to the outside of the joint 160 is suppressed.
  • the joint 160 included in the power storage element 10 has a structure that allows foreign matters that may cause a problem to remain inside the joint 160 during and after the manufacture of the power storage element 10. Thereby, the highly reliable power storage element 10 is realized.
  • the joint 160 includes a portion of the pad (clip 150) disposed along the converging part 126 of the electrode body 120 and joined to the converging part 126, and the plurality of recesses 170 includes The clip 150 is formed.
  • the converging part that is formed by laminating the metal foil by exciting the converging part 126 via the clip 150 and that is easily damaged such as peeling or cracking. 126 can be protected. Specifically, since direct contact between the bonding tip 520 and the converging portion 126 of the electrode body is prevented, for example, the number of foreign matters generated in the bonding process for forming the bonding portion 160 is suppressed. In addition, it is possible to obtain an effect of improving the joint strength at the joint 160.
  • the power storage element 10 may include a joint 160 having a shape or structure different from that of the joint 160 illustrated in FIGS. Therefore, in the following, various modified examples related to the joint portion 160 according to the embodiment will be described focusing on differences from the above embodiment.
  • FIG. 10 is a diagram illustrating an arrangement example of the plurality of concave portions 170 formed in the joint portion 160a according to the first modification of the embodiment.
  • a plurality of recesses 170 are formed in a substantially rectangular joint region 165, and the plurality of recesses 170 are a first recess 170a and a second deeper than the first recess 170a.
  • a recess 170b is provided. About these points, it is common with the junction part 160 which concerns on the said embodiment.
  • joint portion 160a a plurality of the second concave portions 170b are arranged along only a part of the outer periphery of the joint region 165, and in this respect, the joint according to the above embodiment is provided. Different from the unit 160.
  • five second concave portions 170b are formed along a side on the minus side in the X-axis direction (see, for example, FIG. 10) that is a side on the center side of the electrode body 120.
  • the remaining ten concave portions 170 are all the first concave portions 170a.
  • the power storage element 10 can suppress the movement of the foreign matter generated in the bonding process even when the power storage element 10 has the bonding portion 160a according to the present modification, thereby obtaining high reliability.
  • a plurality of second recesses 170b may be arranged along only other sides in the bonding region 165.
  • the power storage element 10 is in the posture shown in FIG. 10, that is, when the longitudinal direction of the connection plate 142 (see FIG. 1) of the current collector 140 coincides with the Z-axis direction.
  • only the three second recesses 170b may be arranged along the lower side of the bonding region 165 in FIG. Thereby, it is suppressed that the foreign material which generate
  • the second recesses 170b may be arranged along at least a part of the outer periphery of the bonding region 165.
  • the movement of the foreign matter generated in the bonding process to the outside of the bonding portion 160a is disposed along the outer periphery of the bonding region 165 and is relatively deeply depressed (corresponding to the plurality of second concave portions 170b). Can be efficiently suppressed.
  • FIG. 11 is a diagram illustrating an arrangement example of the plurality of concave portions 170 formed in the joint portion 160b according to the second modification of the embodiment.
  • the plurality of recesses 170 are arranged in a distributed manner, and the plurality of second recesses 170b are arranged along the outer periphery of the joint region 165a so as to surround one or more first recesses 170a. Has been. About these points, it is common with the junction part 160 which concerns on the said embodiment.
  • the joint region 165a is elliptical, and the plurality of second recesses 170b are arranged along the outer periphery of the ellipse, so that a plurality (10 in the present embodiment). ) First recesses 170a. This is different from the joint 160 according to the above-described embodiment.
  • the plurality of recesses 170 formed in the joint 160b do not have to be arranged in a matrix as shown in FIG. 7 or FIG. 10, and each of the plurality of recesses 170 is within a predetermined plane area. You may arrange
  • the bonding portion 160b is formed with the plurality of second recesses 170b so as to surround the plurality of first recesses 170a inside the bonding region 165a, whereby the bonding according to the first embodiment is performed.
  • the same effect as the part 160 is produced. In other words, almost all foreign matters generated inside the joining region 165a can be prevented from proceeding to the outside of the joining region 165a (that is, movement of foreign matter from the inside of the joining portion 160b).
  • the plurality of second recesses 170b need not be arranged along the entire outer periphery of the bonding region 165a, and the plurality of second recesses 170b are arranged along only a part of the outer periphery of the bonding region 165a. May be.
  • the joint 160 may have a larger number of first recesses 170a than the second recesses 170b.
  • the movement of the foreign material generated in the formation of each of the relatively large number of first recesses 170a is suppressed by the one or more second recesses 170b and the portion immediately below the second recesses 170b. This is the same when the ratio of the one or more first recesses 170a is larger than the ratio of the one or more second recesses 170b in the plan view of the bonding region 165 (see FIG. 7).
  • FIG. 12 is a perspective view showing an outline of the internal structure of the energy storage device 10 a that does not include the clip 150.
  • the power storage element 10a shown in FIG. 12 is common to the power storage element 10 according to the above-described embodiment except that the clip 150 is not provided, and a detailed description thereof is omitted.
  • the joining chip 520 When a contact material such as the clip 150 is not used for joining the converging part 126 of the electrode body 120 and the connecting plate part 142 of the current collector 140, the joining chip 520 includes either the converging part 126 or the connecting plate part 142. (In the electric storage element 10a shown in FIG. 12, the bonding tip 520 is pressed against the converging portion 126). In this case, a joining region 165 in which a plurality of recesses 170 are arranged is formed on the one side, and the plurality of recesses 170 includes a plurality of first recesses 170a and a plurality of second recesses 170b (for example, FIG. 5). (See FIG. 7). Even in this case, for example, the movement of the foreign matter generated in the portion corresponding to the first recess 170a of the converging portion 126 is suppressed by the portion corresponding to the second recess 170b.
  • the electrode body included in the electricity storage element 10 does not have to be a wound type.
  • the power storage element 10 may include a stacked electrode body in which, for example, flat plate plates are stacked.
  • the electrical storage element 10 may be provided with the electrode body which has a structure which laminated
  • a converging portion formed by laminating an active material uncoated portion of the positive electrode plate or the negative electrode plate is formed at the end portion of the electrode body.
  • the joining portion 160 for example, the joining portion 160 according to the above-described embodiment is formed, so that the effect of suppressing movement of foreign matter generated in the joining step can be obtained.
  • first recess 170a and one second recess 170b may be formed in the joint 160.
  • the first recess 170a and the second recess 170b are arranged in the X-axis direction, and the second recess 170b is closer to the center of the electrode body 120 than the first recess 170a (for example, in FIG. 7).
  • the plurality of protrusions 530 included in the bonding tip 520 used for forming the bonding portion 160 may have different heights in three or more stages.
  • the bonding tip 520 may have a third protrusion that is taller than the second protrusion 530 b as at least one protrusion 530 of the plurality of protrusions 530.
  • the bonding tip 520 that vibrates in the horizontal direction is moved vertically with respect to the overlapping portion of the converging portion 126 and the current collector 140 of the electrode body 120, so that three portions having different bonding timings can be obtained.
  • a single joint 160 having the following can be formed.
  • the joining part 160 may have a third recessed part deeper than the second recessed part 170 b as at least one recessed part 170 among the plurality of recessed parts 170.
  • the part where the joining is started first in time series is the part where the joining is started later (following joining part). It can exist as a wall against the generated foreign matter. That is, there is an effect of suppressing movement of the foreign matter generated in the joining process.
  • the bonding tip 520 may have a plurality of protrusions 530 having a uniform height.
  • the bonding tip 520 is placed in a position where the protrusion arrangement surface 521 of the bonding tip 520 is inclined with respect to the overlapping portion of the converging portion 126 of the electrode body 120 and the current collector 140. Press against the part.
  • one or more protrusions of the plurality of protrusions 530 can be pressed against the overlapped portion before the other one or more protrusions. That is, in the joint portion 160, a plurality of portions having different joining timings can be formed.
  • one or more second recesses 170b are first formed using the bonding chip 520, and then the bonding chip 520 is formed. May be moved (or the overlapping portion of the converging portion 126 and the current collector 140 may be moved) to form one or more first recesses 170a. That is, two types of concave portions 170 (first concave portion 170a and second concave portion 170b) having different depths may be formed by performing the bonding operation twice using one bonding chip 520.
  • each of the 2nd recessed part 170b and the 1st recessed part 170a may be formed with another chip
  • the shape of the bonding region does not need to be rectangular (for example, the bonding region 165 (see FIG. 7)) or elliptical (for example, the bonding region 165a (see FIG. 11)), and the plurality of concave portions 170 are arranged side by side. As long as it is a region to be processed, it can take any shape as appropriate.
  • the current collector 140 may have at least one connection plate portion 142.
  • two converging portions 126 that exist in the thickness direction across the winding axis on the negative electrode side of the electrode body 120 may be collectively bonded to one connection plate portion. That is, the “two converging units 126” may be physically handled as one converging unit 126.
  • the present invention can be applied to power storage elements such as lithium ion secondary batteries.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un élément de stockage d'électricité (10) qui comprend un corps à électrodes (120) qui est obtenu par stratification d'une plaque d'électrode positive (122) et d'une plaque d'électrode négative (123), et un collecteur (140) qui est connecté électriquement au corps à électrodes (120). Ce procédé de fabrication d'un élément de stockage d'électricité (10) comprend une étape de soudage à laquelle le collecteur (140) et une partie d'extrémité du corps à électrodes (120) dans une première direction qui croise la direction de stratification de la plaque d'électrode positive (122) et de la plaque d'électrode négative (123) sont soudés l'un à l'autre au moyen d'une tête de soudage (520) qui présente une pluralité de saillies (530). À l'étape de soudage, un premier évidement (170a) et un second évidement (170b) qui est plus profond que le premier évidement (170a) sont formés dans une partie de chevauchement dans laquelle le collecteur (140) chevauche une partie de convergence (126), qui est la partie d'extrémité du corps à électrodes (120), par vibration de la partie de chevauchement au moyen de la tête de soudage (520).
PCT/JP2016/078099 2015-09-29 2016-09-23 Élément de stockage d'électricité et procédé de fabrication d'élément de stockage d'électricité WO2017057200A1 (fr)

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JP2019139954A (ja) * 2018-02-09 2019-08-22 トヨタ自動車株式会社 蓄電装置の製造方法
CN111554960A (zh) * 2019-02-08 2020-08-18 三洋电机株式会社 蓄电元件的制造方法、蓄电元件、接合方法以及接合体
JP2023014838A (ja) * 2021-07-19 2023-01-31 プライムプラネットエナジー＆ソリューションズ株式会社 ホーン、端子部品および二次電池
WO2023189626A1 (fr) * 2022-03-29 2023-10-05 株式会社村田製作所 Batterie secondaire

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JP6975917B2 (ja) * 2018-10-11 2021-12-01 パナソニックＩｐマネジメント株式会社 接合構造体

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WO2023189626A1 (fr) * 2022-03-29 2023-10-05 株式会社村田製作所 Batterie secondaire

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