WO2017158705A1 - Dispositif de stockage d'électricité - Google Patents

Dispositif de stockage d'électricité Download PDF

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Publication number
WO2017158705A1
WO2017158705A1 PCT/JP2016/058041 JP2016058041W WO2017158705A1 WO 2017158705 A1 WO2017158705 A1 WO 2017158705A1 JP 2016058041 W JP2016058041 W JP 2016058041W WO 2017158705 A1 WO2017158705 A1 WO 2017158705A1
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WO
WIPO (PCT)
Prior art keywords
electrode
storage device
case
electricity storage
separator
Prior art date
Application number
PCT/JP2016/058041
Other languages
English (en)
Japanese (ja)
Inventor
英高 柴田
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to PCT/JP2016/058041 priority Critical patent/WO2017158705A1/fr
Publication of WO2017158705A1 publication Critical patent/WO2017158705A1/fr

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a power storage device.
  • Patent Document 1 describes a battery having an electrode body in which a positive electrode, a separator, and a negative electrode are stacked and wound.
  • a power storage device having a wound electrode body has a problem that it is difficult to reduce the thickness. From the viewpoint of obtaining a thin electricity storage device, it is preferable to form an electrode body by laminating a sheet-like positive electrode, a sheet-like separator, and a sheet-like negative electrode. Further, in an electricity storage device having a stacked electrode body, since the resistance of the electrode body is low, advantages such as a large current can be taken out and a long life can be obtained.
  • the main object of the present invention is to provide a power storage device that is thin and excellent in impact resistance.
  • the electricity storage device includes a rectangular parallelepiped case, an electrode body, an electrolyte, a first electrode terminal, and a second electrode terminal.
  • the electrode body is arranged in the case.
  • the electrode body includes a first electrode, a second electrode, and a separator.
  • the separator is disposed between the first electrode and the second electrode.
  • the electrolyte is filled in the case.
  • the first electrode terminal is provided on an end face located on one side of the case in one direction.
  • the first electrode terminal is electrically connected to the first electrode.
  • the second electrode terminal is provided on an end face located on one side of the case in one direction.
  • the second electrode terminal is electrically connected to the second electrode.
  • the first electrode includes a rectangular first electrode body and a first lead portion.
  • the first lead portion is drawn from the first electrode body.
  • the second electrode has a rectangular second electrode body and a second lead portion.
  • the second lead portion is drawn from the second electrode body.
  • the first connecting member connects the first lead portions of the plurality of first electrodes and the first electrode terminal.
  • the first connecting member has elasticity in one direction.
  • the second connection member connects the second lead portion of the plurality of second electrodes and the second electrode terminal.
  • the second connecting member has elasticity in one direction.
  • the electrode body is a laminated type having a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode. . Therefore, the electricity storage device according to the present invention is thin.
  • the first and second electrode terminals and the first and second lead portions are connected by the first and second connection members having elasticity in one direction. For this reason, when stress, impact, or vibration is applied to the electricity storage device according to the present invention, transmission of the stress or the like to the electrode body is buffered by the first and second connection members having elasticity in one direction. The For this reason, the electricity storage device according to the present invention is excellent in impact resistance.
  • the electricity storage device preferably has the following configuration.
  • the 1st connection member is comprised by the plate-shaped member which has a 1st part, a 2nd part, and a 1st bending part.
  • the first portion is connected to the first lead portion.
  • the second part is connected to the first connecting member.
  • the first bent portion connects the first portion and the second portion.
  • the 2nd connection member is comprised by the plate-shaped member which has a 3rd part, a 4th part, and a 2nd bending part.
  • the third portion is connected to the second lead portion.
  • the fourth portion is connected to the second connection member.
  • the second bent portion connects the third portion and the fourth portion.
  • the electrode body is formed by integrating the first electrode, the second electrode, and the separator, and the electrode body and the case are joined.
  • the electricity storage device according to the present invention further includes an adhesive layer that adheres the electrode body and the case.
  • one of the first and second electrode terminals may be constituted by a case. Said
  • FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment.
  • FIG. 2 is a schematic plan view of the electricity storage device according to the first embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.
  • FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG.
  • FIG. 7 is a schematic cross-sectional view of the electricity storage device according to the second embodiment.
  • FIG. 8 is a schematic cross-sectional view of the electricity storage device according to the third embodiment.
  • FIG. 9 is a schematic cross-sectional view of a part of the electricity storage device according to the fourth embodiment.
  • FIG. 10 is a schematic cross-sectional view of a part of the electricity storage device according to the fourth embodiment.
  • FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment.
  • FIG. 2 is a schematic plan view of the electricity storage device according to this embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.
  • FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG.
  • a power storage device 1 shown in FIGS. 1 to 4 is a power storage device including an electrolyte 4 such as an electrolytic solution.
  • the electricity storage device 1 may be, for example, a battery such as a secondary battery or a capacitor such as an electric double layer capacitor.
  • the power storage device 1 includes a rectangular parallelepiped case 2.
  • the “cuboid shape” includes a rectangular parallelepiped shape having a shape with rounded corners in plan view.
  • Case 2 may be made of a conductor or may be made of an insulator.
  • the case 2 can be made of, for example, a metal such as aluminum, stainless steel, or copper, or a resin.
  • an electrode body 3 is arranged inside the case 2.
  • the electrode body 3 includes a positive electrode 31, a negative electrode 32, and a separator 33.
  • the positive electrode 31 and the negative electrode 32 face each other in the stacking direction T with the separator 33 interposed therebetween.
  • a separator 33 is disposed between the positive electrode 31 and the negative electrode 32 in the stacking direction T.
  • the separator 33 insulates the positive electrode 31 and the negative electrode 32 from each other.
  • the end sides of the separators 33 adjacent to each other are connected via the positive electrode 31.
  • the two separators 33 adjacent to each other constitute a bag-shaped separator 33a.
  • the positive electrode 31 is disposed in the bag-shaped separator 33a. But in this invention, the separator which adjoins in the lamination direction T does not need to be joined and made into the bag shape.
  • a sheet-like separator may be provided between the positive electrode and the negative electrode.
  • the positive electrode 31 constitutes a “first electrode” and the negative electrode 32 constitutes a “second electrode”.
  • the configuration of the positive electrode 31 can be appropriately determined depending on the type of the electricity storage device 1.
  • the positive electrode 31 can be configured by a positive electrode current collector and an active material layer provided on at least one surface of the positive electrode current collector.
  • the positive electrode 31 can be constituted by a positive electrode current collector and a polarizable electrode layer provided on at least one surface of the positive electrode current collector. it can.
  • the configuration of the negative electrode 32 can be appropriately determined depending on the type of the electricity storage device 1.
  • the negative electrode 32 when the electricity storage device 1 is a secondary battery, the negative electrode 32 can be constituted by a negative electrode current collector and an active material layer provided on at least one surface of the negative electrode current collector.
  • the negative electrode 32 when the electricity storage device 1 is an electric double layer capacitor, the negative electrode 32 can be constituted by a negative electrode current collector and a polarizable electrode layer provided on at least one surface of the negative electrode current collector. it can.
  • the separator 33 can be constituted by, for example, a porous sheet having open cells to which ions in the electrolyte can move.
  • the separator 33 may be made of, for example, polypropylene, polyethylene, polyimide, cellulose, aramid, polyvinylidene fluoride, Teflon (registered trademark), or the like.
  • the surface of the separator 33 may be covered with a ceramic coat layer, an adhesive layer, or the like.
  • the surface of the separator 33 may have adhesiveness.
  • the separator 33 may be a single layer film made of one material, or a composite film or a multilayer film made of one kind or two or more kinds of materials.
  • an insulating layer such as a ceramic coat layer may be provided on the surfaces of the positive electrode 31 and the negative electrode 32.
  • An undercoat layer containing carbon or the like may be provided between the current collectors of the positive electrode 31 and the negative electrode 32 and the active material layer.
  • the positive electrode 31, the separator 33, and the negative electrode 32 are stacked a plurality of times in this order.
  • the laminated body 70 of the plurality of positive electrodes 31, the plurality of separators 33 and the plurality of negative electrodes 32, and the insulating tape 5 constitute an integral electrode body 3. That is, the electrode body 3 is integrated by the insulating tape 5.
  • the insulating tape 5 is provided so as to cover the side surface of the laminate 70 of the positive electrode 31, the negative electrode 32, and the separator 33, and the laminate 70 is integrated.
  • the insulating tape 5 includes a first insulating tape 51 and a second insulating tape 52.
  • the first insulating tape 51 is provided on the W1 side of the laminated body 70.
  • the first insulating tape 51 straddles the first main surface 70a and the second main surface 70b of the multilayer body 70 via one side (W1 side) side surface in the width direction W of the multilayer body 70. It is provided.
  • the first insulating tape 51 and the first main surface 70a are joined, and the first insulating tape 51 and the second main surface 70b are joined, so that the first end is obtained.
  • At least the distal end portion of the first end portion 33e1 is held so that at least the distal end portion of the portion 33e1 is bent toward one side (T1 side) in the stacking direction T.
  • the second insulating tape 52 is provided on the W2 side of the laminated body 70.
  • the second insulating tape 52 straddles the first main surface 70a and the second main surface 70b of the multilayer body 70 via the other side (W2 side) side surface in the width direction W of the multilayer body 70. It is provided. Since the second insulating tape 52 and the first main surface 70a are joined, and the second insulating tape 52 and the second main surface 70b are joined, the second end is obtained. At least the distal end portion of the second end portion 33e2 is held so that at least the distal end portion of the portion 33e2 is bent toward one side (T1 side) in the stacking direction T.
  • the joining method of the insulating tapes 51 and 52 and the laminated body 70 is not specifically limited.
  • the insulating tapes 51 and 52 and the laminated body 70 may be directly bonded, or may be bonded by using an adhesive to be adhesively bonded.
  • the insulating tapes 51 and 52 may be formed of an adhesive tape, and the insulating tapes 51 and 52 may be bonded to the laminate 70.
  • the insulating tapes 51 and 52 are constituted by double-sided adhesive tape, and the insulating tapes 51 and 52 are bonded to the laminate 70, and the laminate 70 and the case 2 are bonded by the insulating tapes 51 and 52. It may be fixed by. By doing so, the displacement of the stacked body 70 in the case 2 is effectively suppressed.
  • the adhesive includes an adhesive and an adhesive.
  • the adhesive tape includes an adhesive tape and an adhesive tape.
  • the insulating tape 5 may be composed of, for example, a resin tape made of polyimide, polypropylene, acrylic, etc., or a metal foil such as aluminum foil, copper foil, stainless steel foil, or nickel foil coated with an insulating layer. it can.
  • the electrode body 3 and the case 2 are joined. Specifically, the electrode body 3 is bonded and fixed to the inner surface of the case 2 with an adhesive layer 6. In FIG. 3, the electrode body 3 is bonded to the case 2 on the upper side (T1 side) in the figure, but may be bonded to the lower side in the figure.
  • the positive electrode 31 has a rectangular positive electrode main body 31a and a first lead portion 31b drawn from the positive electrode main body 31a in the length direction L.
  • the negative electrode 32 has a rectangular negative electrode main body 32a and a second lead portion 32b drawn in the length direction L from the negative electrode main body 32a.
  • drawing-out part may be pulled out in directions other than the length direction L, respectively.
  • a positive terminal (first terminal) 41 is provided on the end surface 2 a located on one side in the length direction L of the case 2.
  • the positive terminal 41 and the first lead portion 31b are electrically connected.
  • the plurality of first lead portions 31b are collected and bent so as to protrude toward the T1 side in the thickness direction T.
  • the tip portions 31b1 of the plurality of first lead portions 31b extend along the stacking direction T toward the T1 side.
  • the distal end portion 31 b 1 and the positive electrode terminal 41 are connected by a first connection member 61.
  • the first connecting member 61 includes a first portion 61a connected to the first lead portion 31b1, a second portion 61b connected to the positive electrode terminal 41, a first portion 61a and a second portion 61b. And a first bent portion 61c protruding to the T1 side.
  • the first connecting member 61 is made of an elastic member such as metal. Accordingly, the first connecting member 61 has elasticity in the length direction L.
  • a negative electrode terminal (second terminal) 42 is provided on the end surface 2 a located on one side in the length direction L of the case 2.
  • the negative terminal 42 and the second lead portion 32b are electrically connected.
  • the plurality of second lead portions 32b are gathered and bent so as to protrude toward the T1 side in the thickness direction T.
  • the tip portions 32b1 of the plurality of second lead portions 32b extend along the stacking direction T toward the T1 side.
  • the distal end portion 32 b 1 and the negative electrode terminal 42 are connected by a second connection member 62.
  • the second connection member 62 includes a third portion 62a connected to the second lead portion 32b, a fourth portion 62b connected to the negative electrode terminal 42, a third portion 62a, and a fourth portion 62b. And a second bent portion 62c protruding to the T1 side.
  • the second connection member 62 is made of an elastic member such as metal. Accordingly, the second connection member 62 has elasticity in the length direction L.
  • the power storage device 1 is provided with first and second connection members 61 and 62 having elasticity in the length direction L. For this reason, for example, when stress, impact, or vibration is applied to the electricity storage device 1, the stress and the like are transmitted to the electrode body 3 by the first and second first and second connection members 61 and 62. Buffered. For this reason, the electrical storage device 1 is excellent in impact resistance. Further, as described above, the electrode body 3 of the electricity storage device 1 is a laminated type in which the sheet-like positive electrode 31, the sheet-like separator 33, and the sheet-like negative electrode 32 are laminated. Therefore, the electricity storage device 1 is thin. That is, the electricity storage device 1 has excellent impact resistance while being thin.
  • the electrode body 3 and the case 2 are joined. Therefore, the electrode body 3 is relatively displaced with respect to the case 2, and the electrode body 3 is prevented from colliding with the case 2. Therefore, the electricity storage device 1 has more excellent impact resistance.
  • the electrode body 3 and the case 2 are bonded by the adhesive layer 6. For this reason, it is buffered by the adhesive layer 6 that an impact applied to the case 2 is transmitted to the electrode body 3. Therefore, the electricity storage device 1 has further excellent impact resistance.
  • the adhesive layer 6 preferably has elasticity, viscosity, or viscoelasticity.
  • first and second connection members may be provided on the first and second connection members.
  • the first and second connecting members tend to increase in size.
  • the first connecting member 61 is provided with one first bent portion 61 c
  • the second connecting member 62 is provided with one second bent portion 62 c.
  • the 1st and 2nd connection members 61 and 62 are small. Accordingly, the power storage device 1 can be reduced in size.
  • first and second electrode terminals are provided separately from the case.
  • the present invention is not limited to this configuration.
  • one of the first and second electrode terminals may be constituted by a case.
  • the electrode body 3 is integrated by the tape 5 .
  • the present invention is not limited to this configuration.
  • the electrode body may be integrated by bonding a positive electrode, a negative electrode, and a separator.
  • the separator is not particularly limited as long as it can insulate the positive electrode and the negative electrode.
  • the separator may be provided in a 99-fold shape.
  • FIG. 7 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment.
  • the insulating tape 5 is composed of a plurality of tapes of the first insulating tape 51 and the second insulating tape 52 .
  • the present invention is not limited to this configuration.
  • the tape may be provided integrally.
  • the first insulating tape 51 and the second insulating tape 52 may be connected to form a single tape. In this case, the number of parts constituting the electricity storage device 1a can be reduced.
  • FIG. 8 is a schematic cross-sectional view of an electricity storage device 1b according to the third embodiment.
  • the insulating tape 5 may wind the laminated body 70 around.
  • FIG. 9 is a schematic cross-sectional view of a part of the electricity storage device according to the fourth embodiment.
  • FIG. 10 is a schematic cross-sectional view of a part of the electricity storage device according to the fourth embodiment.
  • the first connecting member 61 is connected to the opposite side of the positive electrode terminal 41 in the length direction L of the tip portion 31 b 1 of the first lead portion 31 b,
  • the connecting member 62 may be connected to the side opposite to the negative electrode terminal 42 in the length direction L of the distal end portion 32b1 of the second lead portion 32b.

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

Abstract

L'invention concerne un dispositif de stockage d'électricité mince présentant une excellente résistance aux chocs. Un premier élément de connexion (61) connecte une première borne d'électrode (41) à des premières parties de sortie d'une pluralité de premières électrodes (31). Le premier élément de connexion (61) est élastique dans une direction L. Un second élément de connexion (62) connecte une seconde borne d'électrode (42) à des secondes parties de sortie (32b) d'une pluralité de secondes électrodes (32). Le second élément de connexion (62) est élastique dans une direction L.
PCT/JP2016/058041 2016-03-14 2016-03-14 Dispositif de stockage d'électricité WO2017158705A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/058041 WO2017158705A1 (fr) 2016-03-14 2016-03-14 Dispositif de stockage d'électricité

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/058041 WO2017158705A1 (fr) 2016-03-14 2016-03-14 Dispositif de stockage d'électricité

Publications (1)

Publication Number Publication Date
WO2017158705A1 true WO2017158705A1 (fr) 2017-09-21

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PCT/JP2016/058041 WO2017158705A1 (fr) 2016-03-14 2016-03-14 Dispositif de stockage d'électricité

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WO (1) WO2017158705A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009211936A (ja) * 2008-03-04 2009-09-17 Toshiba Corp 非水電解質二次電池および組電池
JP2013191365A (ja) * 2012-03-13 2013-09-26 Toyota Industries Corp 蓄電装置、車両
JP2015130253A (ja) * 2014-01-06 2015-07-16 株式会社東芝 電池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009211936A (ja) * 2008-03-04 2009-09-17 Toshiba Corp 非水電解質二次電池および組電池
JP2013191365A (ja) * 2012-03-13 2013-09-26 Toyota Industries Corp 蓄電装置、車両
JP2015130253A (ja) * 2014-01-06 2015-07-16 株式会社東芝 電池

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