Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
  • H01G11/80—Gaskets; Sealings
• • 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
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
• • 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
  • H01M50/147—Lids or covers
  • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
  • H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
• • 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
  • H01M50/147—Lids or covers
  • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
  • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
• • 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
  • H01M50/183—Sealing members
  • H01M50/184—Sealing members characterised by their shape or structure
• • 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
  • H01M50/183—Sealing members
  • H01M50/186—Sealing members characterised by the disposition of the sealing members
  • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
• • 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
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
• • 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 an electrochemical cell formed by combining a pair of bowl-shaped metal cases via an annular gasket.
• Small-sized electrochemical cells such as lithium batteries and electric double layer capacitors are widely used as auxiliary power supplies or main power supplies for portable electronic products such as mobile communication devices and notebook computers.
• an electrochemical cell as described in Japanese Patent Application Laid-Open No. 2005-123017, there are two metal cases of a bowl-like metal case comprising a face and a wall extending substantially perpendicularly from the periphery of the face. They are combined through an annular gasket to form a button-like shape as a whole.
• the gasket is formed of an insulating material such as rubber, and by combining a metal case through the gasket, each of the metal cases functions as an electrode terminal of the electrochemical cell.
• the upper metal case is formed to be slightly smaller than the lower metal case.
• a groove is formed in the gasket, and a gasket is attached to the inner periphery of the wall of the lower metal case, and the upper metal case wall is formed in the groove formed in the widthwise center of the upper surface of the gasket. The tip of the unit is inserted. Then, by bending the upper end of the wall of the lower metal case inward, the gasket is prevented from coming off, and the upper metal case is pushed into the lower metal case, and the gasket is inserted into both metal cases. It has become closely adhered to and done.
• a sealing material such as an asphalt primer is applied to the surface of the gasket. Electrolyte leakage was prevented by applying and interposing between the gasket and the metal case. At this time, if the applied thickness of the sealing material is nonuniform, there is a problem that the leakage of the electrolyte is apt to occur due to the heat applied during the aging step or mounting. Generally, in order to apply the sealing material uniformly, it is preferable to add a solvent to the sealing material to lower the viscosity.
• a first metal case and a second metal case provided with a wall portion projecting in a substantially vertical direction from a surface portion and the periphery of the surface portion, and a tip of a wall portion of the first metal case And an annular gasket covered with a bottom surface and an outer surface respectively by the surface and the wall of the second metal case. Is bent at an obtuse angle inside so that the tip portion pushes the gasket toward the second metal case side, and the bottom surface of the gasket covered with the surface portion of the second metal case is concentric with the periphery of the surface portion An electrochemical cell is provided, characterized in that an annular projection is formed.
• a first metal case and a second metal case provided with a wall and a wall protruding substantially perpendicularly from the periphery of the wall and the tip of the wall of the first metal case.
• an annular gasket having a slit for receiving the entire circumference of the part, the bottom surface and the outer surface being covered by the surface and the wall of the second metal case, and the tip of the wall of the first metal case Is bent at an obtuse angle inside so that the tip portion pushes the gasket toward the second metal case side, and the bottom surface of the gasket covered by the surface portion of the second metal case has an edge of the face portion.
• An electrochemical cell is provided, which is characterized in that an annular first groove is formed concentrically with it.
• FIG. 1 is a perspective view of an electric double layer capacitor according to a first embodiment of the present invention.
• FIG. 2 is a cross-sectional view of the electric double layer capacitor of the first embodiment of the present invention.
• FIG. 3A is an enlarged cross-sectional view of the vicinity of the gasket before force and tightening in the first embodiment of the present invention.
• Fig. 3B is an enlarged cross-sectional view of the vicinity of the gasket after performing pressure reduction in the first embodiment of the present invention.
• FIG. 3C is an enlarged cross-sectional view of the vicinity of the gasket before force and tightening in a modified example of the first embodiment of the present invention.
• FIG. 4A is an enlarged cross-sectional view of the vicinity of the gasket before force and tightening in a second embodiment of the present invention.
• FIG. 4B is an enlarged cross-sectional view of the vicinity of the gasket after performing pressure reduction in the second embodiment of the present invention.
• FIG. 5A is an enlarged cross-sectional view of the vicinity of the gasket before force and tightening in the third embodiment of the present invention.
• Fig. 5B is an enlarged cross-sectional view of the vicinity of the gasket after performing tensioning in the third embodiment of the present invention.
• FIG. 1 is a perspective view of an electric double layer capacitor according to a first embodiment of the present invention.
• An electrical double layer capacitor (EDLC) is a type of electrochemical cell that stores electrical energy using an electrical double layer formed at the interface between a solid and an electrolyte.
• the electric double layer capacitor 1 of the first embodiment has a button-like shape as a whole, and the upper and lower surfaces thereof are positive and negative.
• the external shape of the electric double layer capacitor 1 has a shape in which an upper metal case 3 and a lower metal case 4 are combined.
• the upper metal case 3 has a disc portion 3b and a wall portion 3a which protrudes substantially vertically downward from the peripheral edge of the disc portion 3b, and the overall shape of the upper metal case 3 is a downward-pointing hook shape.
• the lower metal case 4 has a disk portion 4b which is one size larger than the disk portion 3b of the upper metal case 3 and a wall portion 4a which protrudes substantially vertically upward from the peripheral edge of the disk portion 4b.
• the entire shape of the lower metal case 4 is in the form of a bowl facing upward.
• FIG. 2 A cross-sectional view of electric double layer capacitor 1 is shown in FIG.
• electrodes, separators and the like are accommodated in the space surrounded by the upper metal case 3 and the lower metal case 4. More specifically, a pair of electrodes 5 and 6 are fixed to the inner surfaces of the disk portions 3b and 4b of the upper metal case 3 and the lower metal case 4, respectively.
• a separator 7 for preventing a short circuit due to contact between the electrodes is disposed between the electrode 5 and the electrode 6.
• the diameter of the lower electrode 6 is formed to be about the same as or slightly smaller than the diameter of the disc portion 3 b of the upper metal case 3.
• the diameter of the wall portion 3a of the upper metal case 3 is configured to increase downward. Therefore, the inner diameter of the wall 3a of the upper metal case 3 is sufficiently larger than the outer diameter of the lower electrode 6 at the height of the upper surface of the lower electrode 6, and the upper metal case 3 and the lower electrode 6 are And do not make contact
• the upper electrode 5 and the lower electrode 6 are each impregnated with an electrolyte.
• an electrolyte When such a pair of electrodes containing an electrolyte face each other via the separator 7, the function as an electric double layer capacitor is realized by the following configuration.
• a gasket 8 is inserted between the upper metal case 3 and the lower metal case 4.
• the gasket 8 is formed of a resin such as polypropylene (PP) or polyethylene (PE).
• PP polypropylene
• PE polyethylene
• the gasket 8 is an annular member, and a slit 8a extending downward from the upper surface of the gasket 8 is formed at the center in the width direction.
• the upper end of the wall portion 4 a of the lower metal case 4 is a disk of the lower metal case 4.
• the case is crimped by bending inward in the radial direction of the part 4b It is done.
• the upper metal case 3 is pushed downward by the wall 4 a of the lower metal case 4.
• the gasket 8 is sandwiched between the end 3c of the wall 3a of the upper metal case 3 and the disk 4b of the lower metal case 4 at the position of the slit 8a, and is in close contact with both.
• electrolyte leakage is prevented.
• the gasket 8 is located at the upper end of the wall 4a of the lower metal case 4 by the wall 8a of the lower metal case 4 and the wall 3a of the upper metal case 3 Squeezed between.
• FIGS. 3A and 3B are enlarged cross-sectional views showing the vicinity of the area where the gasket 8 and the disc portion of the lower metal case 4 contact in the cross-sectional view of FIG. 3A shows the state before caulking the wall 4a of the lower metal case 4, and FIG. 3B shows the state after caulking the wall 4a of the lower metal case 4. .
• two annular projecting portions 8 c formed substantially coaxially with the outer periphery of the gasket 8 are formed. As illustrated, before caulking the wall portion 4a of the lower metal case 4, the tip end of the projection 8c is in a state of being in light contact with the upper surface of the disc portion 4b of the lower metal case 4.
• the wall 3a of the upper metal case 3 is pushed downward through the upper end of the gasket 8 Become.
• the wall 3a is once folded outward at its end.
• the wall 3a is formed with a step 3d whose upper surface is substantially parallel to the disc 4b of the lower metal case 4.
• a flat surface that is substantially parallel to the disk portion 4b of the lower metal case 4 is also formed on the tip 3c of the wall 3a.
• the upper metal case 3 is pushed downward via the step 3 d.
• the wall 3a of the upper metal case 3 and the wall 4a of the lower metal case 4 can be easily engaged via the gasket! /.
• a flat surface substantially parallel to the disc portion 4b of the lower metal case 4 is formed at the tip 3c formed by the folding of the wall portion 3a, so that the force applied to the upper metal case 3 can be
• the force S can be efficiently transmitted as a force that presses the portion of the gasket sandwiched between the portion 4b and the portion 4b.
• the projection 8c is efficiently compressed. Can be added.
• the outer diameter of electric double layer capacitor 1 (the diameter of disc portion 4 b of lower metal case 4) is 4.75 mm, and the height is 1.43 mm. is there. Sealing is most effective when forming two projections 8c with a height of 20 ⁇ m to 200 ⁇ m, especially around 80 ⁇ m, on an electric double layer capacitor of such dimensions. be able to.
• the thickness T of the portion of the gasket 8 sandwiched between the tip 3c of the wall 3a of the upper metal case 3 and the disc 4b of the lower metal case 4 is T and the width is When W is set, it is desirable to make the thickness 75 75% or more of the width W.
• the portion of the gasket sandwiched between the tip 3c and the disc 4b in this way the portion becomes stagnant in response to the pressure from the tip 3c of the upper metal case 3. .
• the pressing force from the tip 3c is transmitted to the projecting portion 8c which is the contact portion with the disc portion 4b of the lower metal case 4 which is not greatly relieved by the stagnation of the portion. Therefore, a larger load is applied to the projection 8c, and high sealing performance can be obtained between the projection 8c and the disk 4b of the lower metal case 4.
• the annular projection 8 c is formed substantially concentrically with the outer periphery of the gasket 8 on the surface of the gasket 8 in contact with the disk portion 4 b of the lower metal case 4.
• the adhesion between the bottom surface 8c of the gasket 8 and the disk 4b is improved.
• the gasket 8 and the upper metal are formed on the surface of the gasket 8 in contact with the tip 3c of the wall 3a of the upper metal case 3 by forming an annular projection 8u substantially concentric with the outer periphery of the gasket 8
• the adhesion to the tip 3 c of the case 3 can also be improved.
• FIG. 3C shows a modified example of the first embodiment in which such a projecting portion 8u is further provided.
• FIG. 3C is an enlarged cross-sectional view corresponding to FIG. 3A, showing a state before a force is applied.
• one annular projection 8 u formed substantially concentric with the outer periphery of the gasket 8 is formed substantially at the center of the bottom surface of the slit 8 a formed in the gasket 8.
• the outer diameter of the electric double layer capacitor 1 (diameter of the disk portion 4b of the lower metal case 4) is 4.75 mm, and the height is 1.43 mm.
• the seal can be most effectively performed when one protrusion 8c having a height of about 110 to about 111, particularly about 80 m, is formed.
• a plurality of small protrusions 8u may be formed.
• a configuration in which one protrusion is formed on the bottom surface of the gasket 8 is also included in the scope of the present invention.
• the second embodiment of the present invention described below is an electric double layer capacitor provided with a gasket of such shape.
• FIGS. 4A and 4B a second embodiment of the present invention will be described with reference to FIGS. 4A and 4B.
• the electric double layer capacitor of the second embodiment differs from that of the first embodiment only in the configuration of the gasket 8. Therefore, in the second embodiment, only the differences from the first embodiment will be described, and the description of the configuration common to the first embodiment will be omitted. Further, in the description of the second embodiment, the same or similar reference symbols are used for configurations common to or corresponding to the first embodiment.
• FIGS. 4A and 4B are enlarged cross-sectional views showing the vicinity of the area where the gasket 8 and the disc portion of the lower metal case 4 abut.
• FIG. 4A shows the condition before the wall 4a of the lower metal case 4 is crimped
• FIG. 4B shows the condition after the wall 4a of the lower metal case 4 is crimped.
• a substantially annular projection 8 d coaxially formed with the outer periphery of the gasket 8 is formed over substantially the entire bottom surface 8 b of the gasket 8.
• the tip of the projection 8d is in a state of being in slight contact with the upper surface of the disk 4b of the lower metal case 4.
• the tip of the protrusion 8 d is located substantially directly below the wall tip 3 c of the upper metal case 3.
• the outer diameter of electric double layer capacitor 1 (the diameter of disc portion 4 b of lower metal case 4) is 4.75 mm, and the height is 1.43 mm. is there.
• the amount of protrusion of the protrusion 8d can be most effectively sealed when the height is set to 20 11 1 to 200 m, particularly about 80 m.
• FIGS. 5A and 5B The electric double layer capacitor of the third embodiment also differs from that of the first embodiment only in the configuration of the gasket 8. Therefore, also in the third embodiment, only the differences from the first embodiment will be described, and the description of the configuration common to the first embodiment will be omitted. Further, in the description of the third embodiment, the same or similar reference symbols are used for configurations common to or corresponding to the first embodiment.
• grooves are formed on the bottom of the gasket 8 and the bottom of the slit 8a. There is. The structure will be described below. FIGS.
• FIG. 5A and 5B are enlarged cross-sectional views showing the area where the gasket 8 and the disc portion of the lower metal case 4 are in contact with each other.
• FIG. 5A shows the state before the wall 4a of the lower metal case 4 is crimped
• FIG. 5B shows the state after the wall 4a of the lower metal case 4 is crimped.
• the bottom surface 8b of the gasket 8 is formed with an annular groove 8e formed substantially concentrically with the outer periphery of the gasket 8. Further, a groove 8f is provided in the vicinity of the widthwise center of the groove 8e. As illustrated, before the wall 4a of the lower metal case 4 is crimped, the edge of the groove 8e is in light contact with the upper surface of the disk 4b of the lower metal case 4.
• annular groove 8 g formed substantially concentrically with the outer periphery of the gasket 8 is also formed in the slit 8 a of the gasket 8. As shown in FIG. 5A, when the wall 3a of the upper metal case 3 is stored in the slit 8a, the groove 8g is configured such that the tip 3c of the wall 3a abuts on the groove 8g. .
• the grooves 8e and 8f function as a suction cup, whereby the gasket 8 is strongly adsorbed to the disc portion 4b of the lower metal case 4. It is like going. Therefore, good sealability can be obtained between the upper metal case 3 and the gasket 8.
• the groove 8e on the bottom 8b side of the gasket 8 has a two-step structure of 8e and 8f because the entire first-stage groove 8e corresponds to the disk portion 4b of the lower metal case 4. And the second groove 8f can function as a suction cup even when it is in close contact.
• the outer diameter of electric double layer capacitor 1 (diameter of disc portion 4b of lower metal case 4) is 4.75 mm and height is 1.43 mm. is there.
• forming a groove 8g with a depth of 20 to 200 111, especially about 80 m, in the slit 8a makes the seal between the gasket 8 and the upper metal case 3 most effective. It can be carried out.
• the total depth of the grooves 8e and 8f provided on the bottom surface 8b of the gasket 8 is 20 to 200 ⁇ 111, and the width is 300 to 500 ⁇ 111, in particular, the groove 8e force depth 50
• a groove 8f with a depth of about 50 ⁇ m is provided approximately at the center of the groove 8g, and the seal between the gasket 8 and the lower metal case 4 is most effectively performed. It can be carried out.
• the gasket 8 is applied to the electric double layer capacitor, but the protrusion of this type is applied to other electrochemical cells of similar form, for example, a primary battery and a secondary battery.
• a gasket having a part or a groove may be employed.
• the protrusion and the groove are formed on the bottom surface 8b of the gasket 8, the same protrusion may be formed in other places, for example, in the slit 8a. It is also good.
• the coin-like one is used as the electrochemical cell (electric double layer capacitor).
• the force is not limited to this shape.
• a gasket with the same protrusion may be employed in the electrochemical cell.
• An electrochemical cell comprises a first and a second metal case provided with a face and a wall projecting in a substantially vertical direction from the periphery of the face, and a wall of the first metal case. And an annular gasket covered with a bottom surface and an outer surface respectively by the surface and the wall of the second metal case.
• the tip of the part is inside, so that the tip pushes the gasket towards the second metal case.
• the bottom of the gasket which is bent at an obtuse angle and covered by the surface of the second metal case, is characterized in that an annular protrusion is formed concentrically with the periphery of the surface.
• At least a part of the force S of the protrusion of the gasket may be disposed between the tip of the wall of the first metal case and the surface of the second metal case. This arrangement reduces the size of the gasket and allows the downward pressure to be efficiently transmitted to the projection, resulting in higher sealing performance.
• a part of the gasket is sandwiched between the tip of the wall of the first metal case and the face of the second metal case, and the height T of the part is 75% or more of the width W. Is preferred. As described above, when the thickness of the portion sandwiched between the tip of the wall of the metal case and the surface of the second metal case is set to a certain level or more, this portion becomes stagnant, and the downward pressure is efficiently Higher sealing performance can be obtained.
• a plurality of protrusions may be formed. With this configuration, it is possible to provide parts with high adhesion in multiple stages, and more reliable seal performance is realized.
• the protrusion of the gasket may be formed over substantially the entire surface of the surface facing the surface of the second metal case of the gasket. This configuration makes it possible to reduce the occurrence of local and significant stress concentration in the gasket and extend the life of the gasket.
• the top of the protrusion of the gasket may be disposed between the tip of the wall of the first metal case and the surface of the second metal case.
• the height of the protrusions is preferably 20 ⁇ m to 200 ⁇ m, and the force S is preferably, and more preferably around 80 ⁇ m. If the height of the projection is set to a value in this range, particularly good sealing performance can be obtained.
• a second protrusion may be formed at the bottom of the slit of the gasket.
• the protrusion force of the gasket may have an arc-shaped cross-sectional shape before assembly. Due to the arc-shaped cross-sectional shape, even if the shape of the gasket is slightly distorted, the contact state between the projection and the surface of the second metal case can not be changed significantly, so the sealing performance is not significantly reduced. Therefore, the dimensional tolerance of the gasket can be increased, and the manufacturing cost of the gasket can be reduced. In addition, even if the gasket is attached in a slightly distorted state at the time of assembly, the sealing performance does not change significantly. Thus, the yield of assembling the electrochemical cell is improved.
• An electrochemical cell according to an embodiment of the present invention has two polarizable electrodes, two polarizable electrodes, which are impregnated with an electrolyte, and which are closely attached or joined to the inner surfaces of the first and second metal cases, respectively. It may further comprise a short prevention separator disposed between the electrodes. This configuration realizes an electric double layer capacitor with excellent sealing performance.
• An electrochemical cell comprises a first and a second metal case provided with a face and a wall projecting substantially perpendicularly from the periphery of the face, and a wall of the first metal case.
• a tip of the wall of the first metal case is provided with an annular gasket having a slit for accommodating the entire circumference of the tip, and the bottom and the outside face of the second metal case are covered by the face and the wall of the second metal case.
• the end portion is bent at an obtuse angle inward so that the tip end portion pushes the gasket toward the second metal case side, and the bottom surface of the gasket covered with the surface portion of the second metal case is the periphery of the surface portion And an annular first groove is formed concentrically with the groove.
• a second groove may be further formed in the center of the first groove.
• the second groove forms a negative pressure space having a relatively large volume that is not in intimate contact with the surface portion of the second metal case. Therefore, even if a slight airtight leak occurs at the contact portion between the gasket and the surface of the second metal case, the suction force by the groove is not completely lost, and the surface of the gasket and the second metal case More stable adhesion is realized.
• a third groove may be formed at the bottom of the slit of the gasket. Since the third groove also functions as a suction cup, the adhesion between the tip of the wall of the first metal case and the bottom of the slit of the gasket is improved, and further excellent sealing characteristics can be obtained.
• the depth of the first, second or third groove is preferably 20 m to 200 m.
• the groove depth is set to a value in this range, particularly good seal performance is obtained.
• the width of the first groove is preferably 300 to 500/111. By setting the groove width to a value in this range, particularly good sealing performance can be obtained.
• An electrochemical cell according to an embodiment of the present invention has two polarizable electrodes, which are impregnated with an electrolyte and adhered or joined to the inner surfaces of the first and second metal cases, respectively, and an electrode between the two electrodes. And an electric double layer capacitor further provided with a short prevention separator disposed in This configuration realizes an electric double layer capacitor with excellent sealing performance.

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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)
• Sealing Battery Cases Or Jackets (AREA)

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Citations (2)

• 2007
  • 2007-11-13 WO PCT/JP2007/072000 patent/WO2008059829A1/ja active Search and Examination
  • 2007-11-13 KR KR1020097010880A patent/KR20090081411A/ko not_active Application Discontinuation
  • 2007-11-15 TW TW096143312A patent/TW200832784A/zh unknown

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