WO2017158705A1 - Power storage device - Google Patents

Power storage device 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
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PCT/JP2016/058041
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French (fr)
Japanese (ja)
Inventor
英高 柴田
Original Assignee
株式会社村田製作所
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Priority to PCT/JP2016/058041 priority Critical patent/WO2017158705A1/en
Publication of WO2017158705A1 publication Critical patent/WO2017158705A1/en

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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
    • 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

Provided is a thin power storage device having an excellent impact resistance. A first connection member 61 connects a first electrode terminal 41 to first lead-out parts 31b of a plurality of first electrodes 31. The first connection member 61 is elastic in one direction L. A second connection member 62 connects a second electrode terminal 42 to second lead-out parts 32b of a plurality of second electrodes 32. The second connection member 62 is elastic in one direction L.

Description

蓄電デバイスPower storage device
　本発明は、蓄電デバイスに関する。 The present invention relates to a power storage device.
　従来、種々の電子機器の電源として、蓄電デバイスが用いられている。例えば、特許文献１には、正極、セパレータ及び負極が積層されて巻回された電極体を有する電池が記載されている。 Conventionally, power storage devices have been used as power sources for various electronic devices. For example, 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.
特開２００４－６２２６号公報JP 2004-6226 A
　巻回型の電極体を有する蓄電デバイスは、薄型化が困難であるという問題がある。薄型な蓄電デバイスを得る観点からは、シート状の正極と、シート状のセパレータと、シート状の負極とを積層して電極体を構成することが好ましい。また、積層型の電極体を有する蓄電デバイスでは、電極体の抵抗が低いため、大電流が取り出せる、長寿命である等のメリットも得られる。 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.
　ところで、蓄電デバイスには、耐衝撃性を向上したいという要望がある。 Incidentally, there is a demand for an electricity storage device to improve the impact resistance.
　本発明の主な目的は、薄型で、耐衝撃性に優れた蓄電デバイスを提供することにある。 The main object of the present invention is to provide a power storage device that is thin and excellent in impact resistance.
　本発明に係る蓄電デバイスは、直方体状のケースと、電極体と、電解質と、第１の電極端子と、第２の電極端子とを備える。電極体は、ケース内に配されている。電極体は、第１の電極と、第２の電極と、セパレータとを有する。セパレータは、第１の電極と第２の電極との間に配されている。電解質は、ケース内に充填されている。第１の電極端子は、ケースの一の方向の一方側に位置する端面に設けられている。第１の電極端子は、第１の電極と電気的に接続されている。第２の電極端子は、ケースの一の方向の一方側に位置する端面に設けられている。第２の電極端子は、第２の電極と電気的に接続されている。第１の電極は、矩形状の第１の電極本体と、第１の引き出し部とを有する。第１の引き出し部は、第１の電極本体から引き出されている。第２の電極は、矩形状の第２の電極本体と、第２の引き出し部とを有する。第２の引き出し部は、第２の電極本体から引き出されている。第１の接続部材は、複数の第１の電極の第１の引き出し部と、第１の電極端子とを接続している。第１の接続部材は、一の方向に弾性を有する。第２の接続部材は、複数の第２の電極の第２の引き出し部と、第２の電極端子とを接続している。第２の接続部材は、一の方向に弾性を有する。 The electricity storage device according to the present invention 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.
　本発明に係る蓄電デバイスでは、電極体が、第１の電極と、第２の電極と、前記第１の電極と前記第２の電極との間に配されたセパレータとを有する積層型である。従って、本発明に係る蓄電デバイスは、薄型である。 In the electricity storage device according to the present invention, 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.
　本発明に係る蓄電デバイスでは、一の方向に弾性を有する第１及び第２の接続部材により第１及び第２の電極端子と第１及び第２の引き出し部とが接続されている。このため、本発明に係る蓄電デバイスに応力や衝撃、振動が加わった際に、その応力等が電極体に伝わることが、一の方向に弾性を有する第１及び第２の接続部材により緩衝される。このため、本発明に係る蓄電デバイスは、耐衝撃性に優れている。 In the electricity storage device according to the present invention, 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.
　本発明に係る蓄電デバイスは、以下の構成を有することが好ましい。第１の接続部材は、第１の部分と、第２の部分と、第１の屈曲部とを有する板状部材により構成されている。第１の部分は、第１の引き出し部に接続されている。第２の部分は、第１の接続部材に接続されている。第１の屈曲部は、第１の部分と、第２の部分とを接続している。第２の接続部材は、第３の部分と、第４の部分と、第２の屈曲部とを有する板状部材により構成されている。第３の部分は、第２の引き出し部に接続されている。第４の部分は、第２の接続部材に接続されている。第２の屈曲部は、第３の部分と、第４の部分とを接続している。 The electricity storage device according to the present invention 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.
　本発明に係る蓄電デバイスでは、電極体は、第１の電極、第２の電極及びセパレータとが一体化されており、電極体とケースとが接合されていることが好ましい。 In the electricity storage device according to the present invention, it is preferable that 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.
　本発明に係る蓄電デバイスは、電極体とケースとを接着している接着層をさらに備えることが好ましい。 It is preferable that the electricity storage device according to the present invention further includes an adhesive layer that adheres the electrode body and the case.
　本発明に係る蓄電デバイスでは、第１及び第２の電極端子の一方がケースにより構成されていてもよい。
前記前記る In the electricity storage device according to the present invention, one of the first and second electrode terminals may be constituted by a case.
Said
　本発明によれば、薄型で、耐衝撃性に優れた蓄電デバイスを提供することができる。 According to the present invention, it is possible to provide a power storage device that is thin and excellent in impact resistance.
図１は、第１の実施形態に係る蓄電デバイスの模式的斜視図である。FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment. 図２は、第１の実施形態に係る蓄電デバイスの模式的平面図である。FIG. 2 is a schematic plan view of the electricity storage device according to the first embodiment. 図３は、図１の線ＩＩＩ－ＩＩＩにおける模式的断面図である。3 is a schematic cross-sectional view taken along line III-III in FIG. 図４は、図１の線ＩＶ－ＩＶにおける模式的断面図である。4 is a schematic cross-sectional view taken along line IV-IV in FIG. 図５は、図１の線Ｖ－Ｖにおける模式的断面図である。FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 図６は、図１の線ＶＩ－ＶＩにおける模式的断面図である。6 is a schematic cross-sectional view taken along line VI-VI in FIG. 図７は、第２の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 7 is a schematic cross-sectional view of the electricity storage device according to the second embodiment. 図８は、第３の実施形態に係る蓄電デバイスの模式的断面図である。FIG. 8 is a schematic cross-sectional view of the electricity storage device according to the third embodiment. 図９は、第４の実施形態に係る蓄電デバイスの一部分の模式的断面図である。FIG. 9 is a schematic cross-sectional view of a part of the electricity storage device according to the fourth embodiment. 図１０は、第４の実施形態に係る蓄電デバイスの一部分の模式的断面図である。FIG. 10 is a schematic cross-sectional view of a part of the electricity storage device according to the fourth embodiment.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものである。図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.
　（第１の実施形態）
　図１は、本実施形態に係る蓄電デバイスの模式的斜視図である。図２は、本実施形態に係る蓄電デバイスの模式的平面図である。図３は、図１の線ＩＩＩ－ＩＩＩにおける模式的断面図である。図４は、図１の線ＩＶ－ＩＶにおける模式的断面図である。図５は、図１の線Ｖ－Ｖにおける模式的断面図である。図６は、図１の線ＶＩ－ＶＩにおける模式的断面図である。 (First 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.
　図１～図４に示す蓄電デバイス１は、電解液等の電解質４を備える蓄電デバイスである。具体的には、蓄電デバイス１は、例えば、二次電池等の電池、電気二重層コンデンサ等のコンデンサ等であってもよい。 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. Specifically, 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.
　図１～図３に示すように、蓄電デバイス１は、直方体状のケース２を備えている。なお、本発明において、「直方体状」には、平面視において、角部が丸められた形状を有する直方体状が含まれるものとする。 As shown in FIGS. 1 to 3, the power storage device 1 includes a rectangular parallelepiped case 2. In the present invention, the “cuboid shape” includes a rectangular parallelepiped shape having a shape with rounded corners in plan view.
　ケース２は、導電体により構成されていても良いし、絶縁体により構成されていても良い。ケース２は、例えば、アルミニウム、ステンレス、銅等の金属や、樹脂等により構成することができる。 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.
　図３に示すように、ケース２の内部には、電極体３が配されている。電極体３は、正極３１と、負極３２と、セパレータ３３とを有する。正極３１と負極３２とは、セパレータ３３を介して積層方向Ｔにおいて対向している。積層方向Ｔにおいて、正極３１と負極３２との間には、セパレータ３３が配されている。このセパレータ３３により、正極３１と負極３２とが絶縁されている。本実施形態では、具体的には、正極３１を介して隣り合うセパレータ３３の端辺同士が接続されている。それら隣り合う２枚のセパレータ３３によって、袋状のセパレータ３３ａが構成されている。正極３１は、この袋状セパレータ３３ａ内に配されている。もっとも、本発明において、積層方向Ｔにおいて隣り合うセパレータが接合されて袋状にされていなくてもよい。本発明においては、シート状のセパレータが正極と負極との間に設けられていてもよい。 As shown in FIG. 3, 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. In the present embodiment, specifically, 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. In the present invention, a sheet-like separator may be provided between the positive electrode and the negative electrode.
　なお、本実施形態では、正極３１が「第１の電極」を構成しており、負極３２が「第２の電極」を構成している。 In the present embodiment, the positive electrode 31 constitutes a “first electrode” and the negative electrode 32 constitutes a “second electrode”.
　正極３１の構成は、蓄電デバイス１の種類によって適宜決定することができる。例えば、蓄電デバイス１が二次電池である場合は、正極３１は、正極集電体と、正極集電体の少なくとも一方面の上に設けられた活物質層とにより構成することができる。例えば、蓄電デバイス１が、電気二重層コンデンサである場合は、正極３１は、正極集電体と、正極集電体の少なくとも一方面の上に設けられた分極性電極層とにより構成することができる。 The configuration of the positive electrode 31 can be appropriately determined depending on the type of the electricity storage device 1. For example, when the electricity storage device 1 is a secondary battery, 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. For example, when the electricity storage device 1 is an electric double layer capacitor, 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.
　負極３２の構成は、蓄電デバイス１の種類によって適宜決定することができる。例えば、蓄電デバイス１が二次電池である場合は、負極３２は、負極集電体と、負極集電体の少なくとも一方面の上に設けられた活物質層とにより構成することができる。例えば、蓄電デバイス１が、電気二重層コンデンサである場合は、負極３２は、負極集電体と、負極集電体の少なくとも一方面の上に設けられた分極性電極層とにより構成することができる。 The configuration of the negative electrode 32 can be appropriately determined depending on the type of the electricity storage device 1. For example, 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. For example, 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.
　セパレータ３３は、例えば、電解質中のイオンが移動可能な連続気泡を有する多孔質シートにより構成することができる。セパレータ３３は、例えば、ポリプロピレン、ポリエチレン、ポリイミド、セルロース、アラミド、ポリフッ化ビニリデン、テフロン（登録商標）等により構成されていてもよい。また、セパレータ３３の表面がセラミックコート層や接着層等により覆われていてもよい。セパレータ３３の表面が接着性を有していてもよい。また、セパレータ３３は１種の材料からなる単層膜であってもよく、１種または２種類以上の材料からなる複合膜または多層膜であってもよい。 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.
　また、セパレータ３３を設けない代わりに、若しくは、セパレータ３３を設けると共に、正極３１，負極３２の表面の上にセラミックコート層等の絶縁層を設けてもよい。 Further, instead of providing the separator 33, or in addition to the separator 33, 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.
　なお、正極３１，負極３２の集電体と活物質層との間にカーボン等を含むアンダーコート層を設けてもよい。 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.
　蓄電デバイス１では、正極３１、セパレータ３３及び負極３２が、この順番で複数回積層されている。この複数の正極３１、複数のセパレータ３３及び複数の負極３２の積層体７０及び絶縁性テープ５により、一体の電極体３が構成されている。すなわち、電極体３は、絶縁性テープ５により一体化されている。詳細には、絶縁性テープ５は、正極３１、負極３２及びセパレータ３３の積層体７０の側面を覆うように設けられており、積層体７０を一体化している。具体的には、本実施形態では、絶縁性テープ５は、第１の絶縁性テープ５１と、第２の絶縁性テープ５２とを有する。第１の絶縁性テープ５１は、積層体７０のＷ１側に設けられている。第１の絶縁性テープ５１は、積層体７０の幅方向Ｗにおける一方側（Ｗ１側）側面を経由して、積層体７０の第１の主面７０ａと、第２の主面７０ｂとに跨がって設けられている。第１の絶縁性テープ５１と第１の主面７０ａとが接合されており、かつ、第１の絶縁性テープ５１と第２の主面７０ｂとが接合されていることにより、第１の端部３３ｅ１の少なくとも先端部が積層方向Ｔの一方側（Ｔ１側）に向かって屈曲した状態となるように、第１の端部３３ｅ１の少なくとも先端部を保持している。 In the electricity storage device 1, 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. Specifically, 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. Specifically, in the present embodiment, 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.
　第２の絶縁性テープ５２は、積層体７０のＷ２側に設けられている。第２の絶縁性テープ５２は、積層体７０の幅方向Ｗにおける他方側（Ｗ２側）側面を経由して、積層体７０の第１の主面７０ａと、第２の主面７０ｂとに跨がって設けられている。第２の絶縁性テープ５２と第１の主面７０ａとが接合されており、かつ、第２の絶縁性テープ５２と第２の主面７０ｂとが接合されていることにより、第２の端部３３ｅ２の少なくとも先端部が積層方向Ｔの一方側（Ｔ１側）に向かって屈曲した状態となるように、第２の端部３３ｅ２の少なくとも先端部を保持している。 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.
　なお、絶縁性テープ５１，５２と積層体７０との接合方法は、特に限定されない。例えば、絶縁性テープ５１，５２と積層体７０とを直接接合してもよいし、粘接着剤をもちいて粘接着させることにより接合してもよい。絶縁性テープ５１，５２を粘接着テープにより構成して、絶縁性テープ５１，５２を積層体７０に接着してもよい。絶縁性テープ５１，５２を両面粘接着テープにより構成して、絶縁性テープ５１，５２を積層体７０に接着すると共に、絶縁性テープ５１，５２により積層体７０とケース２とを接着することにより固定してもよい。そうすることにより、ケース２内において積層体７０が変位することが効果的に抑制される。また、絶縁性テープ５１，５２と積層体７０とを、絶縁性テープ５１，５２とは別の粘接着テープを用いて固定してもよい。 In addition, the joining method of the insulating tapes 51 and 52 and the laminated body 70 is not specifically limited. For example, 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. Moreover, you may fix the insulating tapes 51 and 52 and the laminated body 70 using the adhesive tape different from the insulating tapes 51 and 52. FIG.
　ここで、「粘接着」には、「粘着」と「接着」とが含まれるものとする。従って、粘接着剤には、粘着材と、接着剤が含まれる。粘接着テープには、粘着テープと接着テープとが含まれる。 Here, “adhesion” includes “adhesion” and “adhesion”. Accordingly, the adhesive includes an adhesive and an adhesive. The adhesive tape includes an adhesive tape and an adhesive tape.
　なお、絶縁性テープ５は、例えば、ポリイミド、ポリプロピレン、アクリル等の樹脂テープ、アルミ箔、銅箔、ステンレス箔、ニッケル箔等の金属箔の表面を絶縁層によりコーティングしたもの等により構成することができる。 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.
　電極体３とケース２とは、接合されている。具体的には、電極体３は、接着層６によりケース２の内面に接着されて固定されている。なお、図３において、電極体３はケース２に対して、図の上方側（Ｔ１側）に接合されているが、図の下方側に接合するようにしてもよい。 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.
　図４に示すように、正極３１は、矩形状の正極本体３１ａと、正極本体３１ａから長さ方向Ｌに引き出された第１の引き出し部３１ｂとを有する。負極３２は、矩形状の負極本体３２ａと、負極本体３２ａから長さ方向Ｌに引き出された第２の引き出し部３２ｂとを有する。もっとも、本発明において、第１及び第２の引き出し部は、それぞれ長さ方向Ｌ以外の方向に引き出されていてもよい。 As shown in FIG. 4, 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. But in this invention, the 1st and 2nd drawer | drawing-out part may be pulled out in directions other than the length direction L, respectively.
　図１、図２、図４及び図５に示すように、ケース２の長さ方向Ｌの一方側に位置する端面２ａには、正極端子（第１の端子）４１が設けられている。この正極端子４１と、第１の引き出し部３１ｂとが電気的に接続されている。具体的には、図５に示すように、複数の第１の引き出し部３１ｂは、纏められて、厚み方向ＴのＴ１側に向かって突出するように折り曲げられている。複数の第１の引き出し部３１ｂの先端部３１ｂ１は、積層方向Ｔに沿ってＴ１側に延びている。この先端部３１ｂ１と正極端子４１とが、第１の接続部材６１により接続されている。 As shown in FIGS. 1, 2, 4, and 5, 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. Specifically, as shown in FIG. 5, 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.
　第１の接続部材６１は、第１の引き出し部３１ｂ１に接続された第１の部分６１ａと、正極端子４１に接続された第２の部分６１ｂと、第１の部分６１ａと第２の部分６１ｂとを接続しており、Ｔ１側に突出している第１の屈曲部６１ｃとを有する。第１の接続部材６１は、金属等の弾性部材により構成されている。従って、第１の接続部材６１は、長さ方向Ｌに弾性を有する。 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.
　図１、図２、図４及び図６に示すように、ケース２の長さ方向Ｌの一方側に位置する端面２ａには、負極端子（第２の端子）４２が設けられている。この負極端子４２と、第２の引き出し部３２ｂとが電気的に接続されている。具体的には、図６に示すように、複数の第２の引き出し部３２ｂは、纏められて、厚み方向ＴのＴ１側に向かって突出するように折り曲げられている。複数の第２の引き出し部３２ｂの先端部３２ｂ１は、積層方向Ｔに沿ってＴ１側に延びている。この先端部３２ｂ１と負極端子４２とが、第２の接続部材６２により接続されている。 As shown in FIGS. 1, 2, 4, and 6, 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. Specifically, as shown in FIG. 6, 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.
　第２の接続部材６２は、第２の引き出し部３２ｂに接続された第３の部分６２ａと、負極端子４２に接続された第４の部分６２ｂと、第３の部分６２ａと第４の部分６２ｂとを接続しており、Ｔ１側に突出している第２の屈曲部６２ｃとを有する。第２の接続部材６２は、は、金属等の弾性部材により構成されている。従って、第２の接続部材６２は、長さ方向Ｌに弾性を有する。 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.
　蓄電デバイス１では、長さ方向Ｌに弾性を有する第１及び第２の接続部材６１，６２が設けられている。このため、例えば、蓄電デバイス１に応力や衝撃、振動が加わった際に、その応力等が電極体３に伝わることが、第１及び第２の第１及び第２の接続部材６１，６２により緩衝される。このため、蓄電デバイス１は、耐衝撃性に優れている。また、上述のように、蓄電デバイス１の電極体３は、シート状の正極３１と、シート状のセパレータ３３と、シート状の負極３２とが積層された積層型である。従って、蓄電デバイス１は、薄型である。すなわち、蓄電デバイス１は、薄型でありつつ、優れた耐衝撃性を有する。 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.
　さらに、蓄電デバイス１では、電極体３とケース２とが接合されている。従って、電極体３がケース２に対して相対的に変位し、電極体３がケース２と衝突することが抑制されている。従って、蓄電デバイス１は、より優れた耐衝撃性を有する。特に、蓄電デバイス１では、電極体３とケース２とが接着層６により接着されている。このため、ケース２に加わった衝撃が電極体３に伝わることが接着層６により緩衝されている。従って、蓄電デバイス１は、さらに優れた耐衝撃性を有する。 Furthermore, in the electricity storage device 1, 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. In particular, in the electricity storage device 1, 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.
　さらに優れた耐衝撃性を実現する観点からは、接着層６が弾性、粘性又は粘弾性を有することが好ましい。 Further, from the viewpoint of realizing excellent impact resistance, the adhesive layer 6 preferably has elasticity, viscosity, or viscoelasticity.
　なお、例えば、第１及び第２の接続部材に複数の屈曲部を設けることも考えられる。しかしながら、その場合は、第１及び第２の接続部材が大型化する傾向にある。蓄電デバイス１では、第１の接続部材６１にひとつの第１の屈曲部６１ｃが設けられており、第２の接続部材６２にひとつの第２の屈曲部６２ｃが設けられている。このため、第１及び第２の接続部材６１，６２は小型である。従って、蓄電デバイス１の小型化を図ることができる。 Note that, for example, a plurality of bent portions may be provided on the first and second connection members. However, in that case, the first and second connecting members tend to increase in size. In the electricity storage device 1, the first connecting member 61 is provided with one first bent portion 61 c, and the second connecting member 62 is provided with one second bent portion 62 c. For this reason, the 1st and 2nd connection members 61 and 62 are small. Accordingly, the power storage device 1 can be reduced in size.
　なお、本実施形態では、第１及び第２の電極端子が、それぞれケースとは別体に設けられている例について説明した。但し、本発明は、この構成に限定されない。例えば、第１及び第２の電極端子の一方がケースにより構成されていてもよい。 In the present embodiment, the example in which the first and second electrode terminals are provided separately from the case has been described. However, the present invention is not limited to this configuration. For example, one of the first and second electrode terminals may be constituted by a case.
　また、本実施形態では、テープ５により電極体３が一体化されている例について説明した。但し、本発明は、この構成に限定されない。例えば、電極体は、正極、負極、セパレータが接着されることにより一体化されていてもよい。 In the present embodiment, the example in which the electrode body 3 is integrated by the tape 5 has been described. However, the present invention is not limited to this configuration. For example, the electrode body may be integrated by bonding a positive electrode, a negative electrode, and a separator.
　本発明において、セパレータは、正極と負極とを絶縁できるものであれば、特に限定されない。セパレータは、例えば、九十九折り状に設けられていてもよい。 In the present invention, the separator is not particularly limited as long as it can insulate the positive electrode and the negative electrode. For example, the separator may be provided in a 99-fold shape.
　（第２の実施形態）
　図７は、第２の実施形態に係る蓄電デバイス１ａの模式的断面図である。 (Second Embodiment)
FIG. 7 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment.
　第１の実施形態では、絶縁性テープ５が第１の絶縁性テープ５１と第２の絶縁性テープ５２との複数のテープにより構成されている例について説明した。但し、本発明は、この構成に限定されない。本発明において、テープは、一体に設けられていてもよい。例えば、第１の絶縁性テープ５１と第２の絶縁性テープ５２とが接続されて一枚のテープを構成していてもよい。この場合、蓄電デバイス１ａを構成する部品点数を少なくすることができる。 In the first embodiment, the example in which the insulating tape 5 is composed of a plurality of tapes of the first insulating tape 51 and the second insulating tape 52 has been described. However, the present invention is not limited to this configuration. In the present invention, the tape may be provided integrally. For example, 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.
　（第３の実施形態）
　図８は、第３の実施形態に係る蓄電デバイス１ｂの模式的断面図である。 (Third embodiment)
FIG. 8 is a schematic cross-sectional view of an electricity storage device 1b according to the third embodiment.
　図８に示すように、本発明においては、絶縁性テープ５が、積層体７０を巻回していてもよい。 As shown in FIG. 8, in this invention, the insulating tape 5 may wind the laminated body 70 around.
　（第４の実施形態）
　図９は、第４の実施形態に係る蓄電デバイスの一部分の模式的断面図である。図１０は、第４の実施形態に係る蓄電デバイスの一部分の模式的断面図である。 (Fourth 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.
　図９及び図１０に示すように、第１の接続部材６１が第１の引き出し部３１ｂの先端部３１ｂ１の、長さ方向Ｌにおいて正極端子４１とは反対側に接続されており、第２の接続部材６２が第２の引き出し部３２ｂの先端部３２ｂ１の、長さ方向Ｌにおいて負極端子４２とは反対側に接続されていてもよい。 As shown in FIGS. 9 and 10, 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.
１，１ａ，１ｂ　蓄電デバイス
２　ケース
２ａ　ケースの端面
３　電極体
４　電解質
５　絶縁性テープ
６　接着層
３１　正極
３１ａ　正極本体
３１ｂ　第１の引き出し部
３１ｂ１　第１の引き出し部の先端部
３２　負極
３２ａ　負極本体
３２ｂ　第２の引き出し部
３２ｂ１　第２の引き出し部の先端部
３３　セパレータ
３３ａ　袋状セパレータ
３３ｅ１　第１の端部
３３ｅ２　第２の端部
４１　正極端子
４２　負極端子
５１　第１の絶縁性テープ
５２　第２の絶縁性テープ
６１　第１の接続部材
６１ａ　第１の部分
６１ｂ　第２の部分
６１ｃ　第１の屈曲部
６２　第２の接続部材
６２ａ　第３の部分
６２ｂ　第４の部分
６２ｃ　第２の屈曲部
７０　積層体
７０ａ　第１の主面
７０ｂ　第２の主面 1, 1a, 1b Power storage device 2 Case 2a Case end surface 3 Electrode body 4 Electrolyte 5 Insulating tape 6 Adhesive layer 31 Positive electrode 31a Positive electrode body 31b First lead portion 31b1 First lead portion 32 Negative electrode 32a Negative electrode body 32b Second lead portion 32b1 Second lead portion tip 33 Separator 33a Bag-like separator 33e1 First end portion 33e2 Second end portion 41 Positive electrode terminal 42 Negative electrode terminal 51 First insulating tape 52 Second Insulating tape 61 1st connection member 61a 1st part 61b 2nd part 61c 1st bending part 62 2nd connection member 62a 3rd part 62b 4th part 62c 2nd bending part 70 Laminated body 70a 1st main surface 70b 2nd main surface

Claims (5)

  1. 　直方体状のケースと、
    　前記ケース内に配されており、第１の電極と、第２の電極と、前記第１の電極と前記第２の電極との間に配されたセパレータとを有する電極体と、
    　前記ケース内に充填された電解質と、
    　前記ケースの一の方向の一方側に位置する端面に設けられており、前記第１の電極と電気的に接続された第１の電極端子と、
    　前記ケースの一の方向の一方側に位置する端面に設けられており、前記第２の電極と電気的に接続された第２の電極端子と、
    　を備え、
    　前記第１の電極は、
    　矩形状の第１の電極本体と、
    　前記第１の電極本体から引き出された第１の引き出し部と、
    　を有し、
    　前記第２の電極は、
    　矩形状の第２の電極本体と、
    　前記第２の電極本体から引き出された第２の引き出し部と、
    　を有し、
    　前記複数の第１の電極の第１の引き出し部と、前記第１の電極端子とを接続しており、一の方向に弾性を有する第１の接続部材と、
    　前記複数の第２の電極の第２の引き出し部と、前記第２の電極端子とを接続しており、一の方向に弾性を有する第２の接続部材と、
    　をさらに備える、蓄電デバイス。     A rectangular parallelepiped case,
    An electrode body that is disposed in the case and includes a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode;
    An electrolyte filled in the case;
    A first electrode terminal provided on an end surface located on one side in one direction of the case, and electrically connected to the first electrode;
    A second electrode terminal provided on an end face located on one side in one direction of the case, and electrically connected to the second electrode;
    With
    The first electrode is
    A first electrode body having a rectangular shape;
    A first lead portion drawn from the first electrode body;
    Have
    The second electrode is
    A rectangular second electrode body;
    A second lead portion drawn from the second electrode body;
    Have
    A first connecting member connecting the first lead portion of the plurality of first electrodes and the first electrode terminal, and having elasticity in one direction;
    A second connecting member connecting the second lead portion of the plurality of second electrodes and the second electrode terminal, and having elasticity in one direction;
    An electricity storage device further comprising:
  2. 　前記第１の接続部材は、
    　前記第１の引き出し部に接続された第１の部分と、
    　前記第１の接続部材に接続された第２の部分と、
    　前記第１の部分と、前記第２の部分とを接続している第１の屈曲部と、
    　を有する板状部材により構成されており、
    　前記第２の接続部材は、
    　前記第２の引き出し部に接続された第３の部分と、
    　前記第２の接続部材に接続された第４の部分と、
    　前記第３の部分と、前記第４の部分とを接続している第２の屈曲部と、
    　を有する板状部材により構成されている、請求項１に記載の蓄電デバイス。     The first connecting member is
    A first portion connected to the first drawer portion;
    A second portion connected to the first connecting member;
    A first bent portion connecting the first portion and the second portion;
    It is constituted by a plate-shaped member having
    The second connecting member is
    A third portion connected to the second drawer portion;
    A fourth portion connected to the second connecting member;
    A second bent portion connecting the third portion and the fourth portion;
    The electricity storage device according to claim 1, comprising a plate-like member having
  3. 　前記電極体は、前記第１の電極、前記第２の電極及び前記セパレータとが一体化されており、
    　前記電極体と前記ケースとが接合されている、請求項１又は２に記載の蓄電デバイス。     In the electrode body, the first electrode, the second electrode, and the separator are integrated,
    The electrical storage device of Claim 1 or 2 with which the said electrode body and the said case are joined.
  4. 　前記電極体と前記ケースとを接着している接着層をさらに備える、請求項３に記載の蓄電デバイス。 The electricity storage device according to claim 3, further comprising an adhesive layer that adheres the electrode body and the case.
  5. 　前記第１及び第２の電極端子の一方が前記ケースにより構成されている、請求項１～４に記載の蓄電デバイス。 The electricity storage device according to any one of claims 1 to 4, wherein one of the first and second electrode terminals is constituted by the case.
PCT/JP2016/058041 2016-03-14 2016-03-14 Power storage device WO2017158705A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009211936A (en) * 2008-03-04 2009-09-17 Toshiba Corp Nonaqueous electrolyte secondary battery and battery pack
JP2013191365A (en) * 2012-03-13 2013-09-26 Toyota Industries Corp Power storage device and vehicle
JP2015130253A (en) * 2014-01-06 2015-07-16 株式会社東芝 Buttery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009211936A (en) * 2008-03-04 2009-09-17 Toshiba Corp Nonaqueous electrolyte secondary battery and battery pack
JP2013191365A (en) * 2012-03-13 2013-09-26 Toyota Industries Corp Power storage device and vehicle
JP2015130253A (en) * 2014-01-06 2015-07-16 株式会社東芝 Buttery

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