WO2017094545A1 - Electrochemical device - Google Patents

Electrochemical device Download PDF

Info

Publication number
WO2017094545A1
WO2017094545A1 PCT/JP2016/084446 JP2016084446W WO2017094545A1 WO 2017094545 A1 WO2017094545 A1 WO 2017094545A1 JP 2016084446 W JP2016084446 W JP 2016084446W WO 2017094545 A1 WO2017094545 A1 WO 2017094545A1
Authority
WO
WIPO (PCT)
Prior art keywords
main surface
surface portion
electric double
double layer
layer capacitor
Prior art date
Application number
PCT/JP2016/084446
Other languages
French (fr)
Japanese (ja)
Inventor
景司 堀川
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
Publication of WO2017094545A1 publication Critical patent/WO2017094545A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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 an electrochemical device.
  • capacitors have been widely used in various electronic devices such as mobile phones.
  • an electrochemical device such as an electric double-layer capacitor (EDLC) is known.
  • EDLC electric double-layer capacitor
  • an electric double layer capacitor does not involve a chemical reaction during charging and discharging, and thus has a merit of having a long product life, a merit of being able to charge and discharge in a short time with a large current, and the like. .
  • the main object of the present invention is to provide an electrochemical device that is thin and difficult to swell.
  • the electrochemical device includes an electrochemical element and an exterior body.
  • the electrochemical element has a through hole penetrating in the thickness direction.
  • the exterior body has a first main surface portion and a second main surface portion. The second main surface portion is opposed to the first main surface portion.
  • An electrochemical element is enclosed in the exterior body. In the region where the through hole is provided, the first main surface portion and the second main surface portion are joined.
  • the electrochemical element is provided with a through hole, and the first main surface portion and the second main surface portion are joined in a region where the through hole is provided. For this reason, an exterior body is hard to swell. Moreover, as described in Patent Document 1, the electrochemical device can be made thinner as compared with the case where ribs extending outward are formed on the exterior body.
  • the through hole may reach the side surface of the electrochemical element.
  • a plurality of through holes may be provided.
  • the exterior body is less likely to swell.
  • a plurality of through holes are provided at equal intervals along one direction, and the first main surface portion and the second main surface portion are joined to each other in the plurality of through holes. May be. In this case, the exterior body is less likely to swell.
  • a plurality of through holes are provided in a matrix, and the first main surface portion and the second main surface portion may be joined to each other in the plurality of through holes.
  • the exterior body is less likely to swell.
  • the first main surface portion and the second main surface portion may be directly joined.
  • the electrochemical device according to the present invention may further include a bonding material for bonding the first main surface portion and the second main surface portion.
  • an electrochemical device that is thin and hardly swells can be provided.
  • FIG. 1 is a schematic cross-sectional view of the electric double layer capacitor according to the first embodiment.
  • FIG. 2 is a schematic cross-sectional view of the electric double layer capacitor element according to the first embodiment.
  • FIG. 3 is a schematic plan view of the positive electrode according to the first embodiment.
  • FIG. 4 is a schematic plan view of the negative electrode in the first embodiment.
  • FIG. 5 is a schematic cross-sectional view taken along line VV in FIG.
  • FIG. 6 is a schematic cross-sectional view of a part of the electric double layer capacitor according to the first modification.
  • FIG. 7 is a schematic cross-sectional view of a part of the electric double layer capacitor according to the second modification.
  • FIG. 8 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a third modification.
  • FIG. 9 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a fourth modification.
  • FIG. 10 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a fifth modification.
  • FIG. 11 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a sixth modification.
  • FIG. 12 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a seventh modification.
  • FIG. 13 is a schematic plan view of an electric double layer capacitor according to an eighth modification.
  • FIG. 1 is a schematic cross-sectional view of the electric double layer capacitor according to the first embodiment.
  • An electric double layer capacitor 1 shown in FIG. 1 includes a first electric double layer capacitor element (electrochemical element) 1a enclosed in an exterior body 1c and a second electric double layer capacitor element (electrochemical element) 1b.
  • the first and second electric double layer capacitor elements 1a and 1b each have a rectangular shape whose longitudinal direction is parallel to the x-axis direction (first direction).
  • the first electric double layer capacitor element 1a and the second electric double layer capacitor element 1b are arranged along the x-axis direction.
  • the exterior body 1c is also a rectangular shape whose longitudinal direction is parallel to the x-axis direction.
  • the exterior body 1c has a first main surface portion 1c4 and a second main surface portion 1c5.
  • the first main surface portion 1c4 and the second main surface portion 1c5 are opposed to each other via the electric double layer capacitor elements 1a and 1b.
  • Each of the first main surface portion 1c4 and the second main surface portion 1c5 has flexibility.
  • Each of the first and second main surface portions 1c4 and 1c5 can be constituted by, for example, a laminate sheet. Specific examples of the laminate sheet preferably used include a stainless laminate sheet and an aluminum laminate sheet.
  • the exterior body 1c is provided with a rectangular first cell 1c1 and a rectangular second cell 1c2 adjacent to the first cell 1c1 in the x-axis direction.
  • the first electric double layer capacitor element 1a is enclosed in the first cell 1c1.
  • a second electric double layer capacitor element 1b is enclosed in the second cell 1c2.
  • Each cell 1c1, 1c2 is filled with an electrolytic solution.
  • the electrolytic solution includes a cation, an anion, and a solvent.
  • the cation preferably used include tetraethylammonium salt.
  • the anion preferably used include tetrafluoroborate ion (BF 4 ⁇ ) and bistrifluoromethylsulfonylimide ((CF 3 SO 2 ) 2 N ⁇ ).
  • the solvent preferably used include carbonate compounds such as propylene carbonate, ethylene carbonate, diethyl carbonate, and dimethyl carbonate, nitrile compounds, and aqueous solvents such as water.
  • the electrolytic solution may be, for example, a crosslinkable gel electrolytic solution or an ionic liquid made of an imidazole compound.
  • the first electric double layer capacitor element 1a and the second electric double layer capacitor element 1b are constituted by the same electric double layer capacitor element 2.
  • FIG. 2 shows a schematic cross-sectional view of the electric double layer capacitor element 2.
  • the electric double layer capacitor element 2 includes a negative electrode 11, a positive electrode 12, a separator 13, and an adhesive layer 14.
  • the negative electrode 11 and the positive electrode 12 are opposed to each other through the separator 13. Specifically, a plurality of negative electrodes 11 and a plurality of positive electrodes 12 are alternately stacked via separators 13.
  • the negative electrode 11 includes a negative electrode-side collector electrode 11A.
  • the negative electrode side collecting electrode 11A can be made of, for example, an aluminum foil.
  • the thickness of 11 A of negative electrode side collector electrodes can be about 10 micrometers or more and 30 micrometers or less, for example.
  • a negative electrode side polarizable electrode 11B is provided on the negative electrode side collecting electrode 11A.
  • the negative electrode side polarizable electrode 11B is provided only on the main surface facing the positive electrode 12 out of the main surface of the negative electrode side collector electrode 11A.
  • the thickness of the negative electrode side polarizable electrode 11B can be, for example, about 10 ⁇ m to 30 ⁇ m.
  • the negative electrode side polarizable electrode 11B can be made of, for example, carbon.
  • the negative electrode 11 has a rectangular negative electrode body 11a.
  • the negative electrode main body 11 a faces the positive electrode 12 with the separator 13 interposed therebetween.
  • a rectangular extending portion that extends toward the y1 side from the corner on the y1 side in the x-axis direction (first direction) of the negative electrode body 11a and in the y-axis direction (second direction). 11b is connected.
  • a rectangular extending portion 11c extending toward the y1 side is connected to a corner portion on the x2 side in the x-axis direction of the negative electrode body 11a and on the y1 side in the y-axis direction.
  • the positive electrode 12 shown in FIGS. 2 and 4 includes a positive electrode-side collector electrode 12A.
  • the positive electrode side collector electrode 12A can be made of, for example, an aluminum foil or the like.
  • the thickness of the positive electrode side collector electrode 12A can be, for example, about 10 ⁇ m to 30 ⁇ m.
  • the positive electrode side polarizable electrode 12B is provided on the positive electrode side collecting electrode 12A. Specifically, the positive electrode side polarizable electrode 12B is provided only on the main surface facing the negative electrode 11 in the main surface of the positive electrode side collecting electrode 12A.
  • the thickness of the positive electrode side polarizable electrode 12B can be, for example, about 10 ⁇ m to 30 ⁇ m.
  • the positive electrode side polarizable electrode 12B can be made of, for example, carbon.
  • the positive electrode 12 has a rectangular positive electrode body 12a.
  • the positive electrode main body 12 a faces the negative electrode 11 with the separator 13 interposed therebetween.
  • a rectangular extending portion 12b extending toward the y1 side is connected to the x1 side in the x-axis direction of the positive electrode body 12a and from a corner portion on the y1 side in the y-axis direction.
  • a rectangular extending portion 12c extending toward the y1 side is connected from the corner portion on the x2 side in the x-axis direction of the positive electrode body 12a and on the y1 side in the y-axis direction.
  • the negative electrode 11 and the positive electrode 12 which are adjacent in the z-axis direction (thickness direction) are bonded by an adhesive layer 14.
  • the separator 13 is provided between the adjacent negative electrode 11 and positive electrode 12.
  • the separator 13 has a larger plate shape than the negative electrode 11 and the positive electrode 12.
  • the negative electrode 11 and the positive electrode 12 are isolated by the separator 13.
  • Separator 13 can be constituted by a porous sheet having a plurality of open cells, for example.
  • the separator 13 is impregnated with an electrolytic solution.
  • the first and second cells 1c1 and 1c2 have corner portions 1C1 to 1C4, respectively.
  • the first corner 1C1 is located on the x1 side in the x-axis direction and on the y1 side in the y-axis direction.
  • the second corner portion 1C2 is located on the x2 side in the x-axis direction and on the y1 side in the y-axis direction.
  • the third corner 1C3 is located on the x1 side in the x-axis direction and on the y-axis direction y2 side.
  • the fourth corner 1C4 is x2 in the x-axis direction and is located on the y2 side in the y-axis direction.
  • the extended portion 11b of the negative electrode 11 and the extended portion 12b of the positive electrode 12 are located at the first corner 1C1.
  • the extending portion 12b is located on the outer side (x2 side) in the x-axis direction than the extending portion 11b.
  • the extending portion 11c of the negative electrode 11 and the extending portion 12c of the positive electrode 12 are located at the second corner 1C2.
  • the extending portion 11c is located on the inner side (x1 side) in the x-axis direction than the extending portion 12c.
  • the extended portion 11c of the negative electrode 11 and the extended portion 12c of the positive electrode 12 are located at the second corner 1C2.
  • the extending portion 11c is located on the outer side (x1 side) in the x-axis direction than the extending portion 12c.
  • the extending portion 11b of the negative electrode 11 and the extending portion 12b of the positive electrode 12 are located at the first corner 1C1.
  • the extending portion 12b is located on the inner side (x2 side) in the x-axis direction than the extending portion 11b.
  • the negative electrode terminal 15 of the first electric double layer capacitor element 1a is connected to the extending portion 11b of the negative electrode 11 at the first corner 1C1 of the first cell 1c1.
  • the negative electrode terminal 15 extends from the extending portion 11b toward the y1 side in the y-axis direction.
  • the negative electrode terminal 15 penetrates the sealing portion 1c3 of the exterior body 1c and is drawn to the outside of the first cell 1c1.
  • the positive electrode terminal 16 of the first electric double layer capacitor element 1a is connected to the extending portion 12b of the positive electrode 12 at the first corner 1C1 of the first cell 1c1.
  • the positive electrode terminal 16 extends from the extending portion 12b toward the y1 side in the y-axis direction.
  • the positive electrode terminal 16 penetrates the sealing portion 1c3 of the exterior body 1c and is drawn out to the outside of the first cell 1c1.
  • the positive electrode terminal 17 of the second electric double layer capacitor element 1b is connected to the extending portion 12c of the positive electrode 12 at the second corner 1C2 of the second cell 1c2.
  • the positive terminal 17 extends from the extending portion 12c toward the y1 side in the y-axis direction.
  • the positive electrode terminal 17 penetrates the sealing portion 1c3 of the exterior body 1c and is drawn out to the outside of the first cell 1c1.
  • the positive electrode terminal 17 and the negative electrode terminal 15 are electrically connected by a connecting material 19.
  • the negative electrode terminal 18 of the second electric double layer capacitor element 1b extends from the extending portion 11c of the negative electrode 11 toward the y1 side in the y-axis direction at the second corner 1C2 of the second cell 1c2.
  • the negative electrode terminal 18 passes through the sealing portion 1c3 of the exterior body 1c and is drawn to the outside of the first cell 1c1.
  • the electric double layer capacitor 1 is mounted on an electronic device or the like in a state in which the electric double layer capacitor element 1a and the electric double layer capacitor element 1b overlap each other, for example, at the center in the x-axis direction. May be.
  • the capacitor element 2 is provided with a through hole 2a penetrating in the thickness direction.
  • the first main surface portion 1c4 and the second main surface portion 1c5 of the exterior body 1c are joined.
  • the outer package 1c is unlikely to swell.
  • the internal pressure of the cells 1c1 and 1c2 is likely to increase when the amount of swelling of the exterior body 1c is small.
  • the exterior body 1c When the swelling of the exterior body 1c is suppressed by joining the first main surface portion 1c4 and the second main surface portion 1c5, as described in Patent Document 1, the exterior body extends outward. Since it is not necessary to form a rib, the electric double layer capacitor 1 can be thinned.
  • the 1st main surface part 1c4 and the 2nd main surface part 1c5 can be directly joined by the heat seal method etc., for example.
  • the electric double layer capacitor 1 is provided with a circular through hole 2a.
  • the diameter of the through-hole 2a can be 1 mm or more and 10 mm or less, for example.
  • the separator 13 preferably extends inward from the negative electrode 11 and the positive electrode 12, and more preferably 1 mm or more and extends inward from the negative electrode 11 and the positive electrode 12.
  • one joining portion between the first main surface portion 1c4 and the second main surface portion 1c5 is provided.
  • the joint portion is provided at a central portion in a plan view of the cells 1c1 and 1c2. It is because it can suppress more effectively that the exterior body 1c when gas generate
  • the bending part was provided in both the 1st main surface part 1c4 and the 2nd main surface part 1c5, and the example joined was demonstrated.
  • the present invention is not limited to this configuration.
  • a bent portion may be provided only on one of the first and second main surface portions 1c4, 1c5, and the first and second main surface portions 1c4, 1c5 may be joined.
  • the present invention is not limited to this configuration.
  • the first main surface portion 1 c 4 and the second main surface portion 1 c 5 may be indirectly bonded via the bonding material 20.
  • the present invention is not limited to this configuration.
  • the through hole 2 a may reach the side surface of the capacitor element 2.
  • the through hole 2a may be a slit that penetrates the capacitor element 2 in the thickness direction.
  • a plurality of through holes 2a are provided for each electric double layer capacitor element 2, and the first main surface portion 1c4 and the first main surface portion 1c4 are formed in each of the plurality of through holes 2a. 2 main surface part 1c5 may be joined. In this case, the swelling of the electric double layer capacitor 1 can be more effectively suppressed.
  • the through holes 2 a that open to one side surface are provided at equal intervals along a direction parallel to the extending direction of the one side surface.
  • the through-holes 2 a that open to one side surface and the through-holes 2 a that open to the other side surface opposite to the one side surface alternate along the extending direction of the one side surface and the other side surface. And at equal intervals.
  • FIG.10 and FIG.11 when providing the several through-hole 2a, providing at equal intervals is preferable. By doing so, the swelling of the electric double layer capacitor 1 can be more effectively suppressed.
  • a plurality of through holes 2a are arranged in a matrix along one direction and another direction perpendicular to the one direction.
  • the first main surface portion 1c4 and the second main surface portion 1c5 may be joined. By doing so, the swelling of the electric double layer capacitor 1 can be more effectively suppressed. Also in this case, it is preferable that the plurality of through holes 2a are provided at equal intervals.
  • the number of the through-holes 2a is 2-20, and it is more preferable that it is 6-16.
  • the electric double layer capacitor includes a plurality of electric double layer capacitor elements.
  • the present invention is not limited to this configuration.
  • the electric double layer capacitor may have only one electric double layer capacitor element.
  • a plurality of through holes 2a may be provided.
  • the plurality of through holes 2a may be provided linearly along one direction, or may be provided in a matrix.
  • the through hole 2a may be provided so as to open on the side surface of the electric double layer capacitor element.
  • the electrochemical device according to the present invention is not limited to the electric double layer capacitor.
  • the electrochemical device according to the present invention may be, for example, a battery such as a secondary battery. Even in an electrochemical device other than an electric double layer capacitor such as a battery, a through hole is formed in the electrochemical element, and the first main surface portion and the second main surface portion of the exterior body are formed in the portion where the through hole is formed. By joining, the swelling of the device can be effectively suppressed.

Abstract

Provided is a thin-profile electrochemical device that tends not to bulge. The electrochemical device 1 is provided with an electrochemical element 2 and an outer packaging 1c. The electrochemical element 2 has a through hole 2a piercing through in the thickness direction. The outer packaging 1c has a first main surface part 1c4 and a second main surface part 1c5. The second main surface part 1c5 faces the first main surface part 1c4. The electrochemical element 2 is sealed within the outer packaging 1c. The first main surface part 1c4 and the second main surface part 1c5 are joined in the area in which the through hole 2a is provided.

Description

電気化学デバイスElectrochemical devices
　本発明は、電気化学デバイスに関する。 The present invention relates to an electrochemical device.
　従来、例えば携帯電話機などの種々の電子機器にコンデンサが広く用いられている。コンデンサとしては、電気二重層コンデンサ（Ｅｌｅｃｔｒｉｃ　ｄｏｕｂｌｅ－ｌａｙｅｒ　ｃａｐａｃｉｔｏｒ：ＥＤＬＣ）などの電気化学デバイスが知られている。電気二重層コンデンサは、二次電池とは異なり、充放電に際して化学反応を伴わないため、長い製品寿命を有するというメリット、大電流で短時間のうちに充放電させることができるというメリットなどを有する。 Conventionally, capacitors have been widely used in various electronic devices such as mobile phones. As the capacitor, an electrochemical device such as an electric double-layer capacitor (EDLC) is known. Unlike a secondary battery, an electric double layer capacitor does not involve a chemical reaction during charging and discharging, and thus has a merit of having a long product life, a merit of being able to charge and discharge in a short time with a large current, and the like. .
　電気二重層コンデンサなどの電気化学デバイスにおいて、電気化学デバイスの内圧上昇に伴う膨らみを抑制したいという要望がある。例えば、特許文献１に記載の電気化学デバイスでは、外装材にリブを設けることにより、セルの内圧上昇時の膨らみが抑制されている。 In electrochemical devices such as electric double layer capacitors, there is a desire to suppress swelling caused by an increase in internal pressure of the electrochemical device. For example, in the electrochemical device described in Patent Document 1, the ribs on the exterior material are provided to suppress swelling when the internal pressure of the cell is increased.
特開２０１５－８８４０８号公報Japanese Patent Laid-Open No. 2015-88408
　特許文献１に記載されているような電気化学デバイスでは、外装材にリブが設けられているため、電気化学デバイスの薄型化を図ることが困難である。 In an electrochemical device as described in Patent Document 1, it is difficult to reduce the thickness of the electrochemical device because ribs are provided on the exterior material.
　本発明の主な目的は、薄型で膨らみにくい電気化学デバイスを提供することにある。　 The main object of the present invention is to provide an electrochemical device that is thin and difficult to swell. *
　本発明に係る電気化学デバイスは、電気化学素子と、外装体とを備る。電気化学素子は、厚み方向に貫通する貫通孔を有する。外装体は、第１の主面部と、第２の主面部とを有する。第２の主面部は、第１の主面部と対向している。外装体には、電気化学素子が封入されている。貫通孔が設けられた領域において、第１の主面部と第２の主面部とが接合されている。 The electrochemical device according to the present invention includes an electrochemical element and an exterior body. The electrochemical element has a through hole penetrating in the thickness direction. The exterior body has a first main surface portion and a second main surface portion. The second main surface portion is opposed to the first main surface portion. An electrochemical element is enclosed in the exterior body. In the region where the through hole is provided, the first main surface portion and the second main surface portion are joined.
　本発明に係る電気化学デバイスでは、電気化学素子に貫通孔が設けられており、貫通孔が設けられた領域において第１の主面部と第２の主面部とが接合されている。このため、外装体が膨らみにくい。また、特許文献１に記載のように、外装体に、外方に向かって延びるリブを形成する場合と比較して電気化学デバイスを薄型化することができる。 In the electrochemical device according to the present invention, the electrochemical element is provided with a through hole, and the first main surface portion and the second main surface portion are joined in a region where the through hole is provided. For this reason, an exterior body is hard to swell. Moreover, as described in Patent Document 1, the electrochemical device can be made thinner as compared with the case where ribs extending outward are formed on the exterior body.
　本発明に係る電気化学デバイスでは、貫通孔が、電気化学素子の側面に至っていてもよい。 In the electrochemical device according to the present invention, the through hole may reach the side surface of the electrochemical element.
　本発明に係る電気化学デバイスでは、貫通孔が複数設けられていてもよい。この場合、外装体がより膨らみにくい。 In the electrochemical device according to the present invention, a plurality of through holes may be provided. In this case, the exterior body is less likely to swell.
　本発明に係る電気化学デバイスでは、複数の貫通孔が一の方向に沿って等間隔に設けられており、複数の貫通孔のそれぞれにおいて、第１の主面部と第２の主面部とが接合されていてもよい。この場合、外装体がより膨らみにくい。 In the electrochemical device according to the present invention, a plurality of through holes are provided at equal intervals along one direction, and the first main surface portion and the second main surface portion are joined to each other in the plurality of through holes. May be. In this case, the exterior body is less likely to swell.
　本発明に係る電気化学デバイスでは、複数の貫通孔がマトリクス状に設けられており、複数の貫通孔のそれぞれにおいて、第１の主面部と第２の主面部とが接合されていてもよい。この場合、外装体がより膨らみにくい。 In the electrochemical device according to the present invention, a plurality of through holes are provided in a matrix, and the first main surface portion and the second main surface portion may be joined to each other in the plurality of through holes. In this case, the exterior body is less likely to swell.
　本発明に係る電気化学デバイスでは、第１の主面部と第２の主面部とが直接接合されていてもよい。 In the electrochemical device according to the present invention, the first main surface portion and the second main surface portion may be directly joined.
　本発明に係る電気化学デバイスは、第１の主面部と第２の主面部とを接合している接合材をさらに備えていてもよい。 The electrochemical device according to the present invention may further include a bonding material for bonding the first main surface portion and the second main surface portion.
　本発明によれば、薄型で膨らみにくい電気化学デバイスを提供することができる。 According to the present invention, an electrochemical device that is thin and hardly swells can be provided.
図１は、第１の実施形態に係る電気二重層コンデンサの模式的断面図である。FIG. 1 is a schematic cross-sectional view of the electric double layer capacitor according to the first embodiment. 図２は、第１の実施形態における電気二重層コンデンサ素子の模式的断面図である。FIG. 2 is a schematic cross-sectional view of the electric double layer capacitor element according to the first embodiment. 図３は、第１の実施形態における正極の模式的平面図である。FIG. 3 is a schematic plan view of the positive electrode according to the first embodiment. 図４は、第１の実施形態における負極の模式的平面図である。FIG. 4 is a schematic plan view of the negative electrode in the first embodiment. 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、第１の変形例に係る電気二重層コンデンサの一部分の模式的断面図である。FIG. 6 is a schematic cross-sectional view of a part of the electric double layer capacitor according to the first modification. 図７は、第２の変形例に係る電気二重層コンデンサの一部分の模式的断面図である。FIG. 7 is a schematic cross-sectional view of a part of the electric double layer capacitor according to the second modification. 図８は、第３の変形例に係る電気二重層コンデンサの一部分の模式的断面図である。FIG. 8 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a third modification. 図９は、第４の変形例に係る電気二重層コンデンサ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 an electric double layer capacitor according to a fourth modification. 図１０は、第５の変形例に係る電気二重層コンデンサ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 an electric double layer capacitor according to a fifth modification. 図１１は、第６の変形例に係る電気二重層コンデンサの一部分の模式的断面図である。FIG. 11 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a sixth modification. 図１２は、第７の変形例に係る電気二重層コンデンサの一部分の模式的断面図である。FIG. 12 is a schematic cross-sectional view of a part of an electric double layer capacitor according to a seventh modification. 図１３は、第８の変形例に係る電気二重層コンデンサの模式的平面図である。FIG. 13 is a schematic plan view of an electric double layer capacitor according to an eighth modification.
　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、第１の実施形態に係る電気二重層コンデンサの模式的断面図である。 (First embodiment)
FIG. 1 is a schematic cross-sectional view of the electric double layer capacitor according to the first embodiment.
　図１に示す電気二重層コンデンサ１は、外装体１ｃに封入された第１の電気二重層コンデンサ素子（電気化学素子）１ａと、第２の電気二重層コンデンサ素子（電気化学素子）１ｂとを備えている。第１及び第２の電気二重層コンデンサ素子１ａ、１ｂは、それぞれ、長手方向がｘ軸方向（第１の方向）と平行な矩形状である。第１の電気二重層コンデンサ素子１ａと、第２の電気二重層コンデンサ素子１ｂとは、ｘ軸方向に沿って配されている。このため、外装体１ｃも、長手方向がｘ軸方向と平行な矩形状である。 An electric double layer capacitor 1 shown in FIG. 1 includes a first electric double layer capacitor element (electrochemical element) 1a enclosed in an exterior body 1c and a second electric double layer capacitor element (electrochemical element) 1b. I have. The first and second electric double layer capacitor elements 1a and 1b each have a rectangular shape whose longitudinal direction is parallel to the x-axis direction (first direction). The first electric double layer capacitor element 1a and the second electric double layer capacitor element 1b are arranged along the x-axis direction. For this reason, the exterior body 1c is also a rectangular shape whose longitudinal direction is parallel to the x-axis direction.
　図５に示すように、外装体１ｃは、第１の主面部１ｃ４と、第２の主面部１ｃ５とを有する。第１の主面部１ｃ４と、第２の主面部１ｃ５とは、電気二重層コンデンサ素子１ａ、１ｂを介して対向している。第１の主面部１ｃ４と第２の主面部１ｃ５とは、それぞれ、可撓性を有している。第１及び第２の主面部１ｃ４、１ｃ５は、それぞれ、例えば、ラミネートシートにより構成することができる。好ましく用いられるラミネートシートの具体例としては、例えば、ステンレスラミネートシートや、アルミニウムラミネートシート等が挙げられる。 As shown in FIG. 5, the exterior body 1c has a first main surface portion 1c4 and a second main surface portion 1c5. The first main surface portion 1c4 and the second main surface portion 1c5 are opposed to each other via the electric double layer capacitor elements 1a and 1b. Each of the first main surface portion 1c4 and the second main surface portion 1c5 has flexibility. Each of the first and second main surface portions 1c4 and 1c5 can be constituted by, for example, a laminate sheet. Specific examples of the laminate sheet preferably used include a stainless laminate sheet and an aluminum laminate sheet.
　図１に示すように、外装体１ｃには、矩形状の第１のセル１ｃ１と、ｘ軸方向において第１のセル１ｃ１と隣り合う矩形状の第２のセル１ｃ２とが設けられている。第１のセル１ｃ１に第１の電気二重層コンデンサ素子１ａが封入されている。第２のセル１ｃ２に第２の電気二重層コンデンサ素子１ｂが封入されている。 As shown in FIG. 1, the exterior body 1c is provided with a rectangular first cell 1c1 and a rectangular second cell 1c2 adjacent to the first cell 1c1 in the x-axis direction. The first electric double layer capacitor element 1a is enclosed in the first cell 1c1. A second electric double layer capacitor element 1b is enclosed in the second cell 1c2.
　各セル１ｃ１，１ｃ２には、電解液が充填されている。電解液は、陽イオンと、陰イオンと、溶媒とを含む。好ましく用いられる陽イオンとしては、例えば、テトラエチルアンモニウム塩などが挙げられる。好ましく用いられる陰イオンとしては、例えば、四フッ化ホウ酸イオン（ＢＦ４ －）や、ビストリフルオロメチルスルホニルイミド（（ＣＦ３ＳＯ２）２Ｎ－）などが挙げられる。好ましく用いられる溶媒としては、プロピレンカーボネート、エチレンカーボネート、ジエチルカーボネート、ジメチルカーボネートなどのカーボネート化合物、ニトリル化合物、水などの水系溶媒などが挙げられる。 Each cell 1c1, 1c2 is filled with an electrolytic solution. The electrolytic solution includes a cation, an anion, and a solvent. Examples of the cation preferably used include tetraethylammonium salt. Examples of the anion preferably used include tetrafluoroborate ion (BF 4 − ) and bistrifluoromethylsulfonylimide ((CF 3 SO 2 ) 2 N − ). Examples of the solvent preferably used include carbonate compounds such as propylene carbonate, ethylene carbonate, diethyl carbonate, and dimethyl carbonate, nitrile compounds, and aqueous solvents such as water.
　電解液は、例えば、架橋性のゲル電解液やイミダゾール化合物からなるイオン液体であってもよい。 The electrolytic solution may be, for example, a crosslinkable gel electrolytic solution or an ionic liquid made of an imidazole compound.
　本実施形態では、第１の電気二重層コンデンサ素子１ａと、第２の電気二重層コンデンサ素子１ｂとは、同様の電気二重層コンデンサ素子２により構成されている。図２に電気二重層コンデンサ素子２の模式的断面図を示す。 In the present embodiment, the first electric double layer capacitor element 1a and the second electric double layer capacitor element 1b are constituted by the same electric double layer capacitor element 2. FIG. 2 shows a schematic cross-sectional view of the electric double layer capacitor element 2.
　図２に示すように、電気二重層コンデンサ素子２は、負極１１と、正極１２と、セパレータ１３と、接着層１４とを有する。 As shown in FIG. 2, the electric double layer capacitor element 2 includes a negative electrode 11, a positive electrode 12, a separator 13, and an adhesive layer 14.
　負極１１と正極１２とは、セパレータ１３を介して対向している。具体的には、複数の負極１１と複数の正極１２とが、セパレータ１３を介して交互に積層されている。 The negative electrode 11 and the positive electrode 12 are opposed to each other through the separator 13. Specifically, a plurality of negative electrodes 11 and a plurality of positive electrodes 12 are alternately stacked via separators 13.
　負極１１は、負極側集電極１１Ａを備えている。負極側集電極１１Ａは、例えば、アルミニウム箔等により構成することができる。負極側集電極１１Ａの厚みは、例えば、１０μｍ以上３０μｍ以下程度とすることができる。負極側集電極１１Ａの上には、負極側分極性電極１１Ｂが設けられている。詳細には、負極側集電極１１Ａの主面のうち、正極１２と対向する主面の上にのみ負極側分極性電極１１Ｂが設けられている。負極側分極性電極１１Ｂの厚みは、例えば、１０μｍ以上３０μｍ以下程度とすることができる。負極側分極性電極１１Ｂは、例えば、カーボン等により構成することができる。 The negative electrode 11 includes a negative electrode-side collector electrode 11A. The negative electrode side collecting electrode 11A can be made of, for example, an aluminum foil. The thickness of 11 A of negative electrode side collector electrodes can be about 10 micrometers or more and 30 micrometers or less, for example. On the negative electrode side collecting electrode 11A, a negative electrode side polarizable electrode 11B is provided. Specifically, the negative electrode side polarizable electrode 11B is provided only on the main surface facing the positive electrode 12 out of the main surface of the negative electrode side collector electrode 11A. The thickness of the negative electrode side polarizable electrode 11B can be, for example, about 10 μm to 30 μm. The negative electrode side polarizable electrode 11B can be made of, for example, carbon.
　図３に示すように、負極１１は、矩形状の負極本体１１ａを有する。この負極本体１１ａが正極１２とセパレータ１３を介して対向している。負極本体１１ａのｘ軸方向（第１の方向）におけるｘ１側であって、ｙ軸方向（第２の方向）におけるｙ１側の角部からは、ｙ１側に向かって延びる矩形状の延設部１１ｂが接続されている。一方、負極本体１１ａのｘ軸方向におけるｘ２側であって、ｙ軸方向におけるｙ１側の角部からは、ｙ１側に向かって延びる矩形状の延設部１１ｃが接続されている。 As shown in FIG. 3, the negative electrode 11 has a rectangular negative electrode body 11a. The negative electrode main body 11 a faces the positive electrode 12 with the separator 13 interposed therebetween. A rectangular extending portion that extends toward the y1 side from the corner on the y1 side in the x-axis direction (first direction) of the negative electrode body 11a and in the y-axis direction (second direction). 11b is connected. On the other hand, a rectangular extending portion 11c extending toward the y1 side is connected to a corner portion on the x2 side in the x-axis direction of the negative electrode body 11a and on the y1 side in the y-axis direction.
　図２及び図４に示す正極１２は、正極側集電極１２Ａを備えている。正極側集電極１２Ａは、例えば、アルミニウム箔等により構成することができる。正極側集電極１２Ａの厚みは、例えば、１０μｍ以上３０μｍ以下程度とすることができる。 The positive electrode 12 shown in FIGS. 2 and 4 includes a positive electrode-side collector electrode 12A. The positive electrode side collector electrode 12A can be made of, for example, an aluminum foil or the like. The thickness of the positive electrode side collector electrode 12A can be, for example, about 10 μm to 30 μm.
　正極側集電極１２Ａの上には、正極側分極性電極１２Ｂが設けられている。詳細には、正極側集電極１２Ａの主面のうち、負極１１と対向する主面の上にのみ正極側分極性電極１２Ｂが設けられている。正極側分極性電極１２Ｂの厚みは、例えば、１０μｍ以上３０μｍ以下程度とすることができる。正極側分極性電極１２Ｂは、例えば、カーボン等により構成することができる。 The positive electrode side polarizable electrode 12B is provided on the positive electrode side collecting electrode 12A. Specifically, the positive electrode side polarizable electrode 12B is provided only on the main surface facing the negative electrode 11 in the main surface of the positive electrode side collecting electrode 12A. The thickness of the positive electrode side polarizable electrode 12B can be, for example, about 10 μm to 30 μm. The positive electrode side polarizable electrode 12B can be made of, for example, carbon.
　図４に示すように、正極１２は、矩形状の正極本体１２ａを有する。この正極本体１２ａが負極１１とセパレータ１３を介して対向している。正極本体１２ａのｘ軸方向のｘ１側であって、ｙ軸方向のｙ１側の角部からは、ｙ１側に向かって延びる矩形状の延設部１２ｂが接続されている。一方、正極本体１２ａのｘ軸方向におけるｘ２側であって、ｙ軸方向におけるｙ１側の角部からはｙ１側に向かって延びる矩形状の延設部１２ｃが接続されている。 As shown in FIG. 4, the positive electrode 12 has a rectangular positive electrode body 12a. The positive electrode main body 12 a faces the negative electrode 11 with the separator 13 interposed therebetween. A rectangular extending portion 12b extending toward the y1 side is connected to the x1 side in the x-axis direction of the positive electrode body 12a and from a corner portion on the y1 side in the y-axis direction. On the other hand, a rectangular extending portion 12c extending toward the y1 side is connected from the corner portion on the x2 side in the x-axis direction of the positive electrode body 12a and on the y1 side in the y-axis direction.
　ｚ軸方向（厚み方向）において隣り合う負極１１と正極１２とは、接着層１４により接着されている。 The negative electrode 11 and the positive electrode 12 which are adjacent in the z-axis direction (thickness direction) are bonded by an adhesive layer 14.
　図２に示すように、セパレータ１３は、隣り合う負極１１及び正極１２の間に設けられている。セパレータ１３は、負極１１及び正極１２よりも大きな平板状である。このセパレータ１３により負極１１と正極１２とが隔離されている。セパレータ１３は、例えば、複数の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１３には、電解液が含浸している。 As shown in FIG. 2, the separator 13 is provided between the adjacent negative electrode 11 and positive electrode 12. The separator 13 has a larger plate shape than the negative electrode 11 and the positive electrode 12. The negative electrode 11 and the positive electrode 12 are isolated by the separator 13. Separator 13 can be constituted by a porous sheet having a plurality of open cells, for example. The separator 13 is impregnated with an electrolytic solution.
　第１及び第２のセル１ｃ１，１ｃ２は、それぞれ、角部１Ｃ１～１Ｃ４を有する。第１の角部１Ｃ１は、ｘ軸方向のｘ１側であって、ｙ軸方向のｙ１側に位置している。第２の角部１Ｃ２は、ｘ軸方向のｘ２側であって、ｙ軸方向のｙ１側に位置している。第３の角部１Ｃ３は、ｘ軸方向のｘ１側であって、ｙ軸方向ｙ２側に位置している。第４の角部１Ｃ４は、ｘ軸方向のｘ２であって、ｙ軸方向のｙ２側に位置している。 The first and second cells 1c1 and 1c2 have corner portions 1C1 to 1C4, respectively. The first corner 1C1 is located on the x1 side in the x-axis direction and on the y1 side in the y-axis direction. The second corner portion 1C2 is located on the x2 side in the x-axis direction and on the y1 side in the y-axis direction. The third corner 1C3 is located on the x1 side in the x-axis direction and on the y-axis direction y2 side. The fourth corner 1C4 is x2 in the x-axis direction and is located on the y2 side in the y-axis direction.
　図１に示すように、第１の電気二重層コンデンサ素子１ａでは、負極１１の延設部１１ｂと、正極１２の延設部１２ｂとが第１の角部１Ｃ１に位置している。延設部１２ｂは、延設部１１ｂよりもｘ軸方向の外側（ｘ２側）に位置している。負極１１の延設部１１ｃと、正極１２の延設部１２ｃとが第２の角部１Ｃ２に位置している。延設部１１ｃは、延設部１２ｃよりもｘ軸方向の内側（ｘ１側）に位置している。 As shown in FIG. 1, in the first electric double layer capacitor element 1a, the extended portion 11b of the negative electrode 11 and the extended portion 12b of the positive electrode 12 are located at the first corner 1C1. The extending portion 12b is located on the outer side (x2 side) in the x-axis direction than the extending portion 11b. The extending portion 11c of the negative electrode 11 and the extending portion 12c of the positive electrode 12 are located at the second corner 1C2. The extending portion 11c is located on the inner side (x1 side) in the x-axis direction than the extending portion 12c.
　第２の電気二重層コンデンサ素子１ｂでは、負極１１の延設部１１ｃと、正極１２の延設部１２ｃとが第２の角部１Ｃ２に位置している。延設部１１ｃは、延設部１２ｃよりもｘ軸方向の外側（ｘ１側）に位置している。負極１１の延設部１１ｂと、正極１２の延設部１２ｂとが第１の角部１Ｃ１に位置している。延設部１２ｂは、延設部１１ｂよりもｘ軸方向の内側（ｘ２側）に位置している。 In the second electric double layer capacitor element 1b, the extended portion 11c of the negative electrode 11 and the extended portion 12c of the positive electrode 12 are located at the second corner 1C2. The extending portion 11c is located on the outer side (x1 side) in the x-axis direction than the extending portion 12c. The extending portion 11b of the negative electrode 11 and the extending portion 12b of the positive electrode 12 are located at the first corner 1C1. The extending portion 12b is located on the inner side (x2 side) in the x-axis direction than the extending portion 11b.
　第１の電気二重層コンデンサ素子１ａの負極端子１５は、第１のセル１ｃ１の第１の角部１Ｃ１において、負極１１の延設部１１ｂに接続されている。負極端子１５は、延設部１１ｂからｙ軸方向のｙ１側に向かって延びている。負極端子１５は、外装体１ｃの封止部１ｃ３を貫通して、第１のセル１ｃ１の外側にまで引き出されている。 The negative electrode terminal 15 of the first electric double layer capacitor element 1a is connected to the extending portion 11b of the negative electrode 11 at the first corner 1C1 of the first cell 1c1. The negative electrode terminal 15 extends from the extending portion 11b toward the y1 side in the y-axis direction. The negative electrode terminal 15 penetrates the sealing portion 1c3 of the exterior body 1c and is drawn to the outside of the first cell 1c1.
　第１の電気二重層コンデンサ素子１ａの正極端子１６は、第１のセル１ｃ１の第１の角部１Ｃ１において、正極１２の延設部１２ｂに接続されている。正極端子１６は、延設部１２ｂからｙ軸方向のｙ１側に向かって延びている。正極端子１６は、外装体１ｃの封止部１ｃ３を貫通して、第１のセル１ｃ１の外側にまで引き出されている。 The positive electrode terminal 16 of the first electric double layer capacitor element 1a is connected to the extending portion 12b of the positive electrode 12 at the first corner 1C1 of the first cell 1c1. The positive electrode terminal 16 extends from the extending portion 12b toward the y1 side in the y-axis direction. The positive electrode terminal 16 penetrates the sealing portion 1c3 of the exterior body 1c and is drawn out to the outside of the first cell 1c1.
　第２の電気二重層コンデンサ素子１ｂの正極端子１７は、第２のセル１ｃ２の第２の角部１Ｃ２において、正極１２の延設部１２ｃに接続されている。正極端子１７は、延設部１２ｃからｙ軸方向のｙ１側に向かって延びている。正極端子１７は、外装体１ｃの封止部１ｃ３を貫通して、第１のセル１ｃ１の外側にまで引き出されている。正極端子１７と負極端子１５とは、接続材１９により電気的に接続されている。 The positive electrode terminal 17 of the second electric double layer capacitor element 1b is connected to the extending portion 12c of the positive electrode 12 at the second corner 1C2 of the second cell 1c2. The positive terminal 17 extends from the extending portion 12c toward the y1 side in the y-axis direction. The positive electrode terminal 17 penetrates the sealing portion 1c3 of the exterior body 1c and is drawn out to the outside of the first cell 1c1. The positive electrode terminal 17 and the negative electrode terminal 15 are electrically connected by a connecting material 19.
　第２の電気二重層コンデンサ素子１ｂの負極端子１８は、第２のセル１ｃ２の第２の角部１Ｃ２において、負極１１の延設部１１ｃからｙ軸方向のｙ１側に向かって延びている。負極端子１８は、外装体１ｃの封止部１ｃ３を貫通して、第１のセル１ｃ１の外側にまで引き出されている。 The negative electrode terminal 18 of the second electric double layer capacitor element 1b extends from the extending portion 11c of the negative electrode 11 toward the y1 side in the y-axis direction at the second corner 1C2 of the second cell 1c2. The negative electrode terminal 18 passes through the sealing portion 1c3 of the exterior body 1c and is drawn to the outside of the first cell 1c1.
　尚、電気二重層コンデンサ１は、例えば、ｘ軸方向の中央において折り曲げ、電気二重層コンデンサ素子１ａと電気二重層コンデンサ素子１ｂとが重なるような態様にされた状態で、電子機器等に搭載されてもよい。 The electric double layer capacitor 1 is mounted on an electronic device or the like in a state in which the electric double layer capacitor element 1a and the electric double layer capacitor element 1b overlap each other, for example, at the center in the x-axis direction. May be.
　ところで、電気二重層コンデンサの使用時に、セルの内部でガスが発生する場合がある。セルの内部でガスが発生すると、外装体が膨らむ。ここで、電気二重層コンデンサ１では、図５に示すように、コンデンサ素子２に、厚み方向に貫通する貫通孔２ａが設けられている。貫通孔２ａが設けられた領域において、外装体１ｃの第１の主面部１ｃ４と第２の主面部１ｃ５とが接合されている。このため、セル１ｃ１、１ｃ２の内部でガスが発生した場合に、外装体１ｃが膨らみにくい。また、外装体１ｃの膨らみ量が少ない時点でセル１ｃ１、１ｃ２の内圧が上昇しやすい。 By the way, when an electric double layer capacitor is used, gas may be generated inside the cell. When gas is generated inside the cell, the outer package expands. Here, in the electric double layer capacitor 1, as shown in FIG. 5, the capacitor element 2 is provided with a through hole 2a penetrating in the thickness direction. In the region where the through hole 2a is provided, the first main surface portion 1c4 and the second main surface portion 1c5 of the exterior body 1c are joined. For this reason, when gas is generated inside the cells 1c1, 1c2, the outer package 1c is unlikely to swell. Further, the internal pressure of the cells 1c1 and 1c2 is likely to increase when the amount of swelling of the exterior body 1c is small.
　第１の主面部１ｃ４と第２の主面部１ｃ５とを接合することにより外装体１ｃの膨らみを抑制した場合には、特許文献１に記載のように、外装体に、外方に向かって延びるリブを形成する必要がないため、電気二重層コンデンサ１を薄型化することができる。 When the swelling of the exterior body 1c is suppressed by joining the first main surface portion 1c4 and the second main surface portion 1c5, as described in Patent Document 1, the exterior body extends outward. Since it is not necessary to form a rib, the electric double layer capacitor 1 can be thinned.
　尚、第１の主面部１ｃ４と第２の主面部１ｃ５とは、例えば、ヒートシール法等により直接接合することができる。 In addition, the 1st main surface part 1c4 and the 2nd main surface part 1c5 can be directly joined by the heat seal method etc., for example.
　電気二重層コンデンサ１では、円形の貫通孔２ａが設けられている。円形の貫通孔２ａを設ける場合は、貫通孔２ａの直径は、例えば、１ｍｍ以上１０ｍｍ以下とすることができる。なお、貫通孔２ａにおいては、セパレータ１３が負極１１及び正極１２よりも内側にまで延びていることが好ましく、１ｍｍ以上、負極１１及び正極１２よりも内側にまで延びていることがより好ましい。 The electric double layer capacitor 1 is provided with a circular through hole 2a. When providing the circular through-hole 2a, the diameter of the through-hole 2a can be 1 mm or more and 10 mm or less, for example. In the through hole 2a, the separator 13 preferably extends inward from the negative electrode 11 and the positive electrode 12, and more preferably 1 mm or more and extends inward from the negative electrode 11 and the positive electrode 12.
　尚、本実施形態では、第１の主面部１ｃ４と第２の主面部１ｃ５との接合部が１個設けられている。この場合、接合部は、セル１ｃ１、１ｃ２の平面視における中央部に設けられていることが好ましい。セル１ｃ１、１ｃ２の内部でガスが発生した場合の外装体１ｃが膨らむことをより効果的に抑制することができるためである。 In the present embodiment, one joining portion between the first main surface portion 1c4 and the second main surface portion 1c5 is provided. In this case, it is preferable that the joint portion is provided at a central portion in a plan view of the cells 1c1 and 1c2. It is because it can suppress more effectively that the exterior body 1c when gas generate | occur | produces inside the cell 1c1, 1c2 expands.
　（変形例）
　第１の実施形態では、第１の主面部１ｃ４と第２の主面部１ｃ５との両方に屈曲部を設け、接合す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、図６に示すように、第１及び第２の主面部１ｃ４、１ｃ５のうちの一方にのみ屈曲部を設け、第１及び第２の主面部１ｃ４、１ｃ５を接合してもよい。 (Modification)
In 1st Embodiment, the bending part was provided in both the 1st main surface part 1c4 and the 2nd main surface part 1c5, and the example joined was demonstrated. However, the present invention is not limited to this configuration. For example, as shown in FIG. 6, a bent portion may be provided only on one of the first and second main surface portions 1c4, 1c5, and the first and second main surface portions 1c4, 1c5 may be joined.
　第１の実施形態では、第１の主面部１ｃ４と第２の主面部１ｃ５とが直接接合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、図７及び図８に示すように、接合材２０を介して第１の主面部１ｃ４と第２の主面部１ｃ５とが間接的に接合されていてもよい。 In the first embodiment, the example in which the first main surface portion 1c4 and the second main surface portion 1c5 are directly joined has been described. However, the present invention is not limited to this configuration. For example, as shown in FIGS. 7 and 8, the first main surface portion 1 c 4 and the second main surface portion 1 c 5 may be indirectly bonded via the bonding material 20.
　第１の実施形態では、貫通孔２ａがコンデンサ素子２の側面に至っていない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、図９、図１０及び図１１に示すように、貫通孔２ａは、コンデンサ素子２の側面に至っていてもよい。貫通孔２ａは、コンデンサ素子２を厚み方向に貫通するスリットであってもよい。 In the first embodiment, the example in which the through hole 2a does not reach the side surface of the capacitor element 2 has been described. However, the present invention is not limited to this configuration. For example, as shown in FIGS. 9, 10, and 11, the through hole 2 a may reach the side surface of the capacitor element 2. The through hole 2a may be a slit that penetrates the capacitor element 2 in the thickness direction.
　また、図１０及び図１１に示すように、各電気二重層コンデンサ素子２に対して、貫通孔２ａが複数設けられており、それら複数の貫通孔２ａのそれぞれにおいて第１の主面部１ｃ４と第２の主面部１ｃ５とが接合されていてもよい。この場合、電気二重層コンデンサ１の膨らみをより効果的に抑制することができる。 Also, as shown in FIGS. 10 and 11, a plurality of through holes 2a are provided for each electric double layer capacitor element 2, and the first main surface portion 1c4 and the first main surface portion 1c4 are formed in each of the plurality of through holes 2a. 2 main surface part 1c5 may be joined. In this case, the swelling of the electric double layer capacitor 1 can be more effectively suppressed.
　具体的には、図１０に示す例では、それぞれ一の側面に開口する貫通孔２ａが、一の側面の延びる方向と平行な方向に沿って等間隔に設けられている。図１１に示す例では、一の側面に開口する貫通孔２ａと、一の側面と対向する他の側面に開口する貫通孔２ａとが、一の側面及び他の側面の延びる方向に沿って交互に、且つ、等間隔に設けられている。図１０及び図１１に示すように、複数の貫通孔２ａを設ける場合は、等間隔に設けることが好ましい。そうすることにより、電気二重層コンデンサ１の膨らみをより効果的に抑制することができる。 Specifically, in the example shown in FIG. 10, the through holes 2 a that open to one side surface are provided at equal intervals along a direction parallel to the extending direction of the one side surface. In the example shown in FIG. 11, the through-holes 2 a that open to one side surface and the through-holes 2 a that open to the other side surface opposite to the one side surface alternate along the extending direction of the one side surface and the other side surface. And at equal intervals. As shown in FIG.10 and FIG.11, when providing the several through-hole 2a, providing at equal intervals is preferable. By doing so, the swelling of the electric double layer capacitor 1 can be more effectively suppressed.
　図１２に示すように、複数の貫通孔２ａが一の方向と、一の方向に対して垂直な他の方向とに沿ってマトリクス状に配されており、それら複数の貫通孔２ａのそれぞれにおいて、第１の主面部１ｃ４と第２の主面部１ｃ５とが接合されていてもよい。そうすることにより、電気二重層コンデンサ１の膨らみをより効果的に抑制することができる。この場合においても、複数の貫通孔２ａは、等間隔に設けられていることが好ましい。 As shown in FIG. 12, a plurality of through holes 2a are arranged in a matrix along one direction and another direction perpendicular to the one direction. In each of the plurality of through holes 2a, The first main surface portion 1c4 and the second main surface portion 1c5 may be joined. By doing so, the swelling of the electric double layer capacitor 1 can be more effectively suppressed. Also in this case, it is preferable that the plurality of through holes 2a are provided at equal intervals.
　尚、複数の貫通孔２ａを設ける場合、貫通孔２ａの数は、２以上２０以下であることが好ましく、６以上１６以下であることがより好ましい。 In addition, when providing the several through-hole 2a, it is preferable that the number of the through-holes 2a is 2-20, and it is more preferable that it is 6-16.
　第１の実施形態では、電気二重層コンデンサが複数の電気二重層コンデンサ素子を備え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、図１３に示すように、電気二重層コンデンサは、電気二重層コンデンサ素子を一つのみ有していてもよい。この場合においても、貫通孔２ａが複数設けられていてもよい。複数の貫通孔２ａが一の方向に沿って直線状に設けられていてもよいし、マトリクス状に設けられていてもよい。貫通孔２ａが、電気二重層コンデンサ素子の側面に開口するように設けられていてもよい。 In the first embodiment, the example in which the electric double layer capacitor includes a plurality of electric double layer capacitor elements has been described. However, the present invention is not limited to this configuration. For example, as shown in FIG. 13, the electric double layer capacitor may have only one electric double layer capacitor element. Also in this case, a plurality of through holes 2a may be provided. The plurality of through holes 2a may be provided linearly along one direction, or may be provided in a matrix. The through hole 2a may be provided so as to open on the side surface of the electric double layer capacitor element.
　なお、第１の実施例及び変形例では、電気二重層コンデンサについて説明した。もっとも、本発明に係る電気化学デバイスは、電気二重層コンデンサに限定されない。本発明に係る電気化学デバイスは、例えば、二次電池等の電池であってもよい。電池等の電気二重層コンデンサ以外の電気化学デバイスにおいても、電気化学素子に貫通孔を形成し、その貫通孔が形成された部分において外装体の第１の主面部と第２の主面部とを接合することにより、デバイスの膨らみを効果的に抑制することができる。 In the first embodiment and the modification, the electric double layer capacitor has been described. However, the electrochemical device according to the present invention is not limited to the electric double layer capacitor. The electrochemical device according to the present invention may be, for example, a battery such as a secondary battery. Even in an electrochemical device other than an electric double layer capacitor such as a battery, a through hole is formed in the electrochemical element, and the first main surface portion and the second main surface portion of the exterior body are formed in the portion where the through hole is formed. By joining, the swelling of the device can be effectively suppressed.
　１　電気二重層コンデンサ
１ａ，１ｂ，２　電気二重層コンデンサ素子
１ｃ　外装体
１ｃ１　第１のセル
１ｃ２　第２のセル
１ｃ３　封止部
１ｃ４　第１の主面部
１ｃ５　第１の主面部
２ａ　貫通孔
１１　負極
１１Ａ　負極側集電極
１１Ｂ　負極側分極性電極
１１ａ　負極本体
１２　正極
１２Ａ　正極側集電極
１２Ｂ　正極側分極性電極
１２ａ　正極本体
１１ｂ，１１ｃ，１２ｂ，１２ｃ　延設部
１３　セパレータ
１４　接着層
１５，１８　負極端子
１６，１７　正極端子
１９　接続材
２０　接合材 DESCRIPTION OF SYMBOLS 1 Electric double layer capacitor | condenser 1a, 1b, 2 Electric double layer capacitor | condenser element 1c Exterior body 1c1 1st cell 1c2 2nd cell 1c3 Sealing part 1c4 1st main surface part 1c5 1st main surface part 2a Through-hole 11 Negative electrode 11A Negative electrode side collector electrode 11B Negative electrode side polarizable electrode 11a Negative electrode body 12 Positive electrode 12A Positive electrode side collector electrode 12B Positive electrode side polarizable electrode 12a Positive electrode main body 11b, 11c, 12b, 12c Extension part 13 Separator 14 Adhesive layers 15, 18 , 17 Positive terminal 19 Connecting material 20 Bonding material

Claims (7)

  1. 　厚み方向に貫通する貫通孔を有する電気化学素子と、
    　第１の主面部と、前記第１の主面部と対向する第２の主面部とを有し、前記電気化学素子が封入された外装体と、
    　を備え、
    　前記貫通孔が設けられた領域において、前記第１の主面部と前記第２の主面部とが接合されている、電気化学デバイス。     An electrochemical element having a through-hole penetrating in the thickness direction;
    An exterior body having a first main surface portion and a second main surface portion facing the first main surface portion, and enclosing the electrochemical element;
    With
    An electrochemical device in which the first main surface portion and the second main surface portion are joined in a region where the through hole is provided.
  2. 　前記貫通孔が、前記電気化学素子の側面に至っている、請求項１に記載の電気化学デバイス。 The electrochemical device according to claim 1, wherein the through hole reaches a side surface of the electrochemical element.
  3. 　前記貫通孔が複数設けられている、請求項１又は２に記載の電気化学デバイス。 The electrochemical device according to claim 1 or 2, wherein a plurality of the through holes are provided.
  4. 　前記複数の貫通孔が一の方向に沿って等間隔に設けられており、前記複数の貫通孔のそれぞれにおいて、前記第１の主面部と前記第２の主面部とが接合されている、請求項３に記載の電気化学デバイス。 The plurality of through holes are provided at equal intervals along one direction, and the first main surface portion and the second main surface portion are joined to each other in each of the plurality of through holes. Item 4. The electrochemical device according to Item 3.
  5. 　前記複数の貫通孔がマトリクス状に設けられており、前記複数の貫通孔のそれぞれにおいて、前記第１の主面部と前記第２の主面部とが接合されている、請求項３に記載の電気化学デバイス。 The electricity according to claim 3, wherein the plurality of through holes are provided in a matrix, and the first main surface portion and the second main surface portion are joined to each other in the plurality of through holes. Chemical device.
  6. 　前記第１の主面部と前記第２の主面部とが直接接合されている、請求項１～５のいずれか一項に記載の電気化学デバイス。 The electrochemical device according to any one of claims 1 to 5, wherein the first main surface portion and the second main surface portion are directly joined.
  7. 前記第１の主面部と前記第２の主面部とを接合している接合材をさらに備える、請求項１～５のいずれか一項に記載の電気化学デバイス。 The electrochemical device according to any one of claims 1 to 5, further comprising a bonding material for bonding the first main surface portion and the second main surface portion.
PCT/JP2016/084446 2015-12-04 2016-11-21 Electrochemical device WO2017094545A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-237412 2015-12-04
JP2015237412 2015-12-04

Publications (1)

Publication Number Publication Date
WO2017094545A1 true WO2017094545A1 (en) 2017-06-08

Family

ID=58797210

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/084446 WO2017094545A1 (en) 2015-12-04 2016-11-21 Electrochemical device

Country Status (1)

Country Link
WO (1) WO2017094545A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11830672B2 (en) 2016-11-23 2023-11-28 KYOCERA AVX Components Corporation Ultracapacitor for use in a solder reflow process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000340265A (en) * 1999-05-31 2000-12-08 Mitsubishi Chemicals Corp Planar and laminated secondary battery
JP2007018917A (en) * 2005-07-08 2007-01-25 Nissan Motor Co Ltd Stacked battery, and battery pack
JP2009158440A (en) * 2007-12-28 2009-07-16 Nec Corp Thin battery
JP2014531111A (en) * 2011-09-20 2014-11-20 エルジー ケム． エルティーディ． Porous electrode assembly and secondary battery including the same
JP2015118929A (en) * 2013-11-15 2015-06-25 株式会社半導体エネルギー研究所 Power storage body and electronic device including the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000340265A (en) * 1999-05-31 2000-12-08 Mitsubishi Chemicals Corp Planar and laminated secondary battery
JP2007018917A (en) * 2005-07-08 2007-01-25 Nissan Motor Co Ltd Stacked battery, and battery pack
JP2009158440A (en) * 2007-12-28 2009-07-16 Nec Corp Thin battery
JP2014531111A (en) * 2011-09-20 2014-11-20 エルジー ケム． エルティーディ． Porous electrode assembly and secondary battery including the same
JP2015118929A (en) * 2013-11-15 2015-06-25 株式会社半導体エネルギー研究所 Power storage body and electronic device including the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11830672B2 (en) 2016-11-23 2023-11-28 KYOCERA AVX Components Corporation Ultracapacitor for use in a solder reflow process

Similar Documents

Publication Publication Date Title
JP6414731B2 (en) Power storage element and power storage device
JP6493515B2 (en) Electric double layer capacitor
JP2018133201A (en) Power storage module
US7198654B1 (en) Separator sheet and method for manufacturing electric double layer capacitor using the same
JP6428910B2 (en) Electric double layer capacitor
US20180190440A1 (en) Electric double layer capacitor and manufacturing method therefor
WO2017094545A1 (en) Electrochemical device
US20120050946A1 (en) Supercapacitor module
JP2014203885A (en) Sealing structure of power storage device and electric double layer capacitor
JP2011176141A (en) Electrochemical device
KR101310441B1 (en) Electrochemical capacitor
JP6926509B2 (en) Power storage device
JP2010021183A (en) Electric double layer capacitor
JP2012243839A (en) Electric power storage device cell and electric power storage device cell module
JP2011176140A (en) Electrochemical device
JP5954143B2 (en) Electrochemical devices
JP2012094569A (en) Power storage unit
JP2010003773A (en) Electric double layer capacitor
JP2009117759A (en) Electric double-layer capacitor
KR20170050444A (en) Pouch type secondary battery
JP6576346B2 (en) Capacitor and capacitor module
JP2006049670A (en) Electrochemical element
JP2018190846A (en) Power storage device, and power storage module
JP2014127611A (en) Electrochemical device
JP2014063788A (en) Electric double layer capacitor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16870482

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16870482

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP