JP2005183373A - Battery case, manufacturing method thereof and battery, electric double-layer capacitor case and manufacturing method thereof, and electric double-layer capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery case or an electric double-layer capacitor case of which the electrolyte does not leak after a long period of use, and which is unlikely corroded by an electrolyte, and to provide a battery or the electric double-layer capacitor which is easy to be mounted to an external electric circuit board. <P>SOLUTION: The battery case or the electric double-layer capacitor case A comprises a base body 1 composed of ceramic where a cuboid recess 1a is formed at the center of the upper surface, while a first conductor layer C and a second conductor layer D are formed independently on the lower surface; a metallized layer 1b formed on the bottom surface of the recess 1a connected to the first conductor layer C; a metal layer 2a which is connected to the second conductor layer D and formed around the recess 1a on the upper surface of the base body 1; and a lid 3 composed of a ferrous alloy. Outer peripheral sides of the jointing part of the lid 3 and the metal layer 2a are jointed via an aluminum-gold-nickel alloy, while inner peripheral sides are jointed via an aluminum alloy whose main component is aluminum. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a battery case and a battery used for a rechargeable battery and the like, and an electric double layer capacitor case and an electric double layer capacitor, and more specifically, a thin battery case used for a small electronic device such as a mobile phone and the like. The present invention relates to a case for an electric double layer capacitor and an electric double layer capacitor used as a backup power source for batteries and semiconductor memories, a standby power source for small electronic devices, and the like.

  In recent years, portable devices typified by mobile phones, portable computers, camera-integrated video tape recorders, etc. have been remarkably developed, and further miniaturization and weight reduction have been demanded. In addition, the demand for batteries as power sources for these portable devices continues to increase, and research on reducing the size and weight by increasing the energy density of the batteries is actively conducted. In particular, the lithium battery is a battery using lithium with a small atomic weight and a large ionization energy, so that it is possible to obtain a high energy density, to achieve a reduction in size and weight, and to be a battery that can be recharged more actively. It has been researched and has now been used for a wide range of applications including power supplies for portable devices.

  Batteries can be broadly divided into cylindrical and square types. The structure is that the positive and negative electrodes are housed in a metal battery case through a separator made of an insulating sheet, and an electrolyte is injected there. It is a sealed structure.

As a positive electrode of a lithium battery, for example, a metal oxide used as a positive electrode active material and a conductive material added thereto is generally used. For example, lithium cobaltate (LiCoO ₂ ) or lithium manganate (LiMn ₂ O ₄ ) is used as the positive electrode active material, and acetylene black (AB) or graphite is used as the conductive material. As the negative electrode of the battery, a lithium titanium composite oxide such as lithium titanate (Li ₄ Ti ₅ O ₁₂ ) or an active material such as graphite or amorphous carbon solidified with a resin is used.

In the lithium battery, the charge / discharge voltage of the positive electrode active material made of LiCoO ₂ or LiMn ₂ O ₄ is about 4V, while the charge / discharge voltage of the negative electrode active material made of a carbon material or the like is around 0V. For this reason, a high discharge voltage of about 3.5 V is achieved by combining these positive electrode active material, negative electrode active material, and electrolytic solution.

  For the positive electrode of the battery, the conductive material is added to the active material, and a binder such as polytetrafluoroethylene or polyvinylidene fluoride is added and mixed to form a slurry, which is formed into a sheet using a well-known doctor blade method. The sheet is formed and then cut into, for example, a circular shape.

  Also, the negative electrode is added to the above active material, as in the positive electrode, a binder such as polytetrafluoroethylene or polyvinylidene fluoride, mixed to form a slurry, and this is formed into a sheet using a known doctor blade method, Next, this sheet is cut into a circular shape, for example.

  Then, the positive electrode and the negative electrode thus prepared are accommodated in a battery case via a separator made of a polyolefin fiber nonwoven fabric or a polyolefin microporous film having a heat resistant temperature of about 150 ° C. A battery is obtained by injecting the liquid.

  A coin-type battery shown in FIG. 4 has been developed in order to further reduce the size and density of the battery thus manufactured.

  This conventional battery includes a separator 14 in which a positive electrode can 11 made of, for example, stainless steel provided with a disk-shaped positive electrode 11b and a negative electrode can 12 made of, for example, stainless steel, provided with a disk-shaped negative electrode 12b are impregnated with an electrolyte. Next, for example, a battery case structure in which the periphery of the positive electrode can 11 and the periphery of the negative electrode can 12 are caulked together via a gasket 15 made of, for example, an insulating polypropylene resin, is joined. Yes. Charging / discharging in the positive electrode 11b and the negative electrode 12b is performed via an external connection terminal member attached to the positive electrode can 11 and the negative electrode can 12 (see, for example, Patent Documents 1 and 2 below).

  Also, in the electric double layer capacitor, in order to reduce the size and density of the electric double layer capacitor, the first electrode can having the shape shown in FIG. A coin-type electric double layer capacitor formed by crimping 11 and the second electrode can 12 has been developed.

The electric double layer capacitor includes a first electrode can 11 made of, for example, stainless steel provided with a disk-shaped first electrode 11a, and a second electrode can 12 made of, for example, stainless steel provided with a second electrode 12a. With the separator 14 containing the electrolyte sandwiched between the first electrode 11a and the second electrode 12a, the edge of the first electrode can 11 and the edge of the second electrode can 12 are gasketed. It is formed by caulking and joining to each other via 15. Charging / discharging in the first electrode 11a and the second electrode 12a is performed via an external connection terminal member attached to the first electrode can 11 and the second electrode can 12 (for example, Patent Document 3 below) 4).
JP 2000-106195 A (page 6-12, FIG. 1) JP 2002-198019 A (page 3-4, FIG. 1) Japanese Patent Laid-Open No. 2002-50551 JP 2003-100569 A

  However, when the conventional batteries as shown in Patent Documents 1 and 2 are exposed to a temperature cycle test (for example, −40 ° C. to 85 ° C.) having a temperature range of hundreds of degrees over a long period of time, for example, polypropylene Due to the difference in coefficient of thermal expansion between the gasket 15 made of resin, the positive electrode can 11 and the negative electrode can 12, a gap is generated at the joint portion of the battery case can which is caulked around the positive electrode can 11 and the negative electrode can 12 via the gasket 15. There is a case where the liquid leaks, which causes the battery performance of the battery to deteriorate, or the copper (Cu) wiring on the external electric circuit board is corroded and disconnected due to the leaked electrolyte, Or the malfunction that the water | moisture content penetrate | invaded into the inside of a battery from this clearance gap, and battery performance deteriorated occurred.

  Also, in the conventional electric double layer capacitor as shown in Patent Documents 3 and 4, as in the conventional battery, a temperature cycle test (for example, −40 ° C. to 85 ° C.) with a temperature range of hundreds of degrees over a long period of time. When the first electrode can 11 and the second electrode can 11 and the second electrode can 12 through the gasket 15 due to a difference in thermal expansion coefficient between the gasket 15 made of polypropylene resin, the first electrode can 11 and the second electrode can 12, for example. There may be a gap at the joint of the battery case that crimps the periphery of the second electrode can 12, causing the electrolyte to leak out, which may deteriorate the performance of the electric double layer capacitor or cause the electrolyte to leak. The copper (Cu) wiring on the external electric circuit board corrodes and breaks, or moisture penetrates into the electric double layer capacitor from this gap and deteriorates the battery electric double layer capacitor performance. There was a bug.

  Further, in order to charge and discharge the conventional battery and the electric double layer capacitor, the external connection terminal member must be connected to the upper and lower sides, and the external connection terminal member must be connected to the external electric circuit board. The connection to the board is complicated, and the volume of the battery including the external connection terminal member and the electric double layer capacitor is increased. Had.

  Therefore, the present invention has been completed in view of the above-mentioned problems, and the purpose of the present invention is to cause the electrolyte solution to leak due to a gap formed in the joint portion of the battery case can after a long period of use and deteriorate the performance. The external electrolyte circuit board will not be damaged by the leaked electrolyte, and moisture will not enter from the outside due to high airtight reliability, and the case components will elute into the electrolyte. The battery case and the battery, and the electric double layer capacitor case and the electric battery which are not deteriorated due to the deterioration of the liquid and which can be easily connected to the external electric circuit board to improve the mass productivity of the external electric circuit board. It is to provide a double layer capacitor.

  The battery case of the present invention has a rectangular parallelepiped recess formed in the center of the upper surface, and a base made of ceramics having a first conductor layer and a second conductor layer provided independently on the lower surface, and the recess A metallization layer formed on the bottom surface of the substrate, a first wiring conductor formed from the metallization layer to the first conductor layer, a metal layer formed around the recess on the top surface of the base, and the metal layer To the second conductor layer and a lid made of an iron-based alloy, and the lid and the metal layer have an aluminum-gold-nickel alloy on the outer peripheral side. And the inner peripheral side is joined via an aluminum alloy containing aluminum as a main component.

  The battery case manufacturing method of the present invention is the battery case manufacturing method described above, wherein a nickel layer and a gold layer are formed on the surface of the metal layer when the lid and the metal layer are joined. A nickel layer and an aluminum layer are sequentially deposited on the surface to which the lid is bonded, and then the surface on which the metal layer and the lid are bonded The lid body is placed together, and then joined by a resistance welding method in which a current is passed to the outer edge of the lid body and the metal layer.

  Furthermore, the battery according to the present invention includes the battery case, a positive electrode plate placed on and electrically connected to the upper surface of the metallized layer, and an insulating sheet impregnated with an electrolyte on the upper surface of the positive electrode plate. And a negative electrode plate that is placed in close contact with each other and is in electrical contact with the lid.

  The electric double layer capacitor case of the present invention has a base made of ceramics in which a rectangular parallelepiped recess is formed at the center of the upper surface, and the first conductor layer and the second conductor layer are independently provided on the lower surface; A metallization layer formed on the bottom surface of the recess, a first wiring conductor formed from the metallization layer to the first conductor layer, a metal layer formed around the recess on the top surface of the base, A second wiring conductor formed from the metal layer to the second conductor layer; and a lid made of an iron-based alloy. The lid and the metal layer have an aluminum-gold outer peripheral side. -It joins via a nickel alloy, and the inner peripheral side is joined via the aluminum alloy which has aluminum as a main component.

  The method for manufacturing an electric double layer capacitor case of the present invention is the above-described method for manufacturing an electric double layer capacitor case, wherein the lid and the metal layer are bonded to the surface of the metal layer. A nickel layer, a gold layer, and an aluminum layer are sequentially deposited, and a nickel layer and an aluminum layer are sequentially deposited on a surface to which the lid is bonded, and then the metal layer and the lid are formed on the upper surface of the base. The lid is placed together with the surfaces to be joined, and then joined by resistance welding method in which a current is passed to the outer end of the lid and the metal layer.

  Furthermore, the electric double layer capacitor of the present invention includes the above case for the electric double layer capacitor, a first electrode placed on and electrically connected to the upper surface of the metallized layer, and an upper surface of the first electrode. A second electrode that is placed in close contact with a separator impregnated with an electrolyte and is in contact with and electrically connected to the lid. is there.

  The battery case of the present invention has a rectangular parallelepiped recess formed at the center of the upper surface, a base made of ceramics on which the first conductor layer and the second conductor layer are provided independently of each other on the lower surface, A metallization layer formed on the bottom surface, a first wiring conductor formed from the metallization layer to the first conductor layer, a metal layer formed around the recess on the top surface of the substrate, and a second layer formed from the metal layer. A second wiring conductor formed over the conductor layer and a lid made of an iron-based alloy, and the lid and the metal layer are joined to each other on the outer peripheral side via an aluminum-gold-nickel alloy, Since the inner peripheral side is joined via an aluminum alloy mainly composed of aluminum, a base made of ceramic with excellent chemical resistance is used, so that it is difficult to be attacked by an electrolyte containing an organic solvent or acid. And hence the battery Case to electrolyte leaks corrosion, no damaging the external electric circuit board. In addition, almost no components of the battery case are eluted in the electrolyte, and the airtight reliability is high, so it is possible to prevent moisture from entering from outside and maintain the characteristics of the electrolyte over a long period of time. can do. As a result, the battery performance can be maintained well over a long period of time.

  Further, the lid body and the metal layer are bonded to each other on the outer peripheral side through an aluminum-gold-nickel alloy, and on the inner peripheral side through an aluminum alloy containing aluminum as a main component. Are firmly bonded on the outer peripheral side and good airtightness can be maintained, and the inner peripheral side in contact with the electrolytic solution is bonded by an aluminum alloy containing aluminum as a main component. The layer is rarely attacked, so that impurities are not eluted into the electrolytic solution, and corrosion of the joint is prevented, so that the electrolytic solution does not leak to the outside. Therefore, it is possible to provide a battery case in which the lid is bonded to the base body with sufficient strength and is excellent in airtight reliability.

  In addition, since the first conductor layer and the second conductor layer are provided independently from each other on the lower surface of the substrate, the first and second electrodes electrically connected to the positive and negative electrode plates of the battery, respectively. The conductor layer can be easily connected to the wiring conductor on the surface of the external electric circuit board by a surface mounting method without using connection means such as an external connection terminal member, and the mass productivity of the external electric circuit board is improved. be able to.

  Furthermore, since the first and second conductor layers provided on the lower surface of the base are directly connected to the wiring conductor on the surface of the external electric circuit board, the external connection terminal on the negative electrode side, which has been indispensable in conventional batteries. This eliminates the need for a member, thereby reducing the size and improving the mass productivity and reducing the manufacturing cost.

  In the battery case manufacturing method of the present invention, when the lid and the metal layer are joined, the nickel layer, the gold layer, and the aluminum layer are sequentially deposited on the surface of the metal layer, and the lid is joined. Then, a nickel layer and an aluminum layer are sequentially deposited on the surface of the substrate, and then placed on the upper surface of the substrate with the metal layer and the surface to which the lid is bonded together, and then the outer edges of the lid and the metal layer. For example, the lid and the metal layer are joined via an aluminum-gold-nickel alloy on the outer peripheral side and the inner peripheral side is made of aluminum. Joined through an aluminum alloy as a main component. Thereby, a strong and highly reliable joint can be formed.

  The battery according to the present invention includes a battery case having the above-described configuration, and a positive electrode plate, an insulating sheet, a negative electrode plate, and an electrolytic solution are accommodated in the battery case so as to cover a substrate made of ceramics and a recess. Since the lid to be joined is firmly joined by the resistance welding method, the generation of the gap that has occurred in the caulking portion in the battery case of the conventional battery is eliminated and the moisture from the gap is removed. Infiltration is eliminated, so that the life of the electrolyte can be extended, and the components of the battery case are hardly eluted in the electrolyte, so that the characteristics of the electrolyte are not greatly impaired, and the electrolyte leaks. Damage to the external electric circuit board can be eliminated.

  Also, the battery of the present invention connects the lid and the negative electrode plate by bringing the wide surface of the lower main surface of the lid made of an iron-based alloy into contact with the negative electrode plate. Can reduce the resistance between the negative electrode plate and the lid, and can efficiently charge and discharge without generating an electrical loss between the negative electrode plate and the lid. It can be excellent in characteristics.

  The electric double layer capacitor case of the present invention has a base made of ceramics in which a rectangular parallelepiped recess is formed at the center of the upper surface, and the first conductor layer and the second conductor layer are independently provided on the lower surface; The metallization layer formed on the bottom surface of the recess, the first wiring conductor formed from the metallization layer to the first conductor layer, the metal layer formed around the recess on the top surface of the base, and the metal layer A second wiring conductor formed over the two conductor layers and a lid made of an iron-based alloy, and the lid and the metal layer are joined to each other on the outer peripheral side via an aluminum-gold-nickel alloy. Since the inner circumference is joined through an aluminum alloy containing aluminum as a main component, a base made of ceramic with excellent chemical resistance is used, so it is attacked by electrolytes containing organic solvents and acids. It ’s difficult, yo Electric double layer capacitor case corrodes out electrolyte leakage Te, no damaging the external electric circuit board. In addition, almost no components of the case for the electric double layer capacitor are eluted in the electrolyte, and since the airtight reliability is high, it is possible to prevent the intrusion of moisture from the outside, and the characteristics of the electrolyte can be maintained for a long time. Can be held over. As a result, the electric double layer capacitor performance can be maintained well over a long period of time.

  Further, the lid body and the metal layer are bonded to each other on the outer peripheral side through an aluminum-gold-nickel alloy, and on the inner peripheral side through an aluminum alloy containing aluminum as a main component. Are firmly bonded on the outer peripheral side and good airtightness can be maintained, and the inner peripheral side in contact with the electrolytic solution is bonded by an aluminum alloy containing aluminum as a main component. The layer is rarely attacked, so that impurities are not eluted into the electrolytic solution, and corrosion of the joint is prevented, so that the electrolytic solution does not leak to the outside. Therefore, it is possible to provide a case for an electric double layer capacitor in which the lid is bonded to the base body with sufficient strength and is excellent in airtight reliability.

  In addition, since the first conductor layer and the second conductor layer are provided independently from each other on the lower surface of the substrate, they are electrically connected to the first and second electrodes of the electric double layer capacitor, respectively. The first and second conductor layers can be easily connected to the wiring conductor on the surface of the external electric circuit board by a surface mounting method without using connection means such as an external connection terminal member. Can be improved in mass production.

  Furthermore, since the first and second conductor layers provided on the lower surface of the base are directly connected to the wiring conductors on the surface of the external electric circuit board, the external part on the second electrode side, which is indispensable in the conventional battery, is used. A connection terminal member becomes unnecessary, and thereby it is possible to reduce the size, improve mass productivity, and reduce manufacturing costs.

  The method for manufacturing an electric double layer capacitor case according to the present invention is a method for manufacturing the electric double layer capacitor case, wherein a nickel layer is formed on the surface of the metal layer when the lid and the metal layer are joined. The gold layer and the aluminum layer are sequentially deposited, and the nickel layer and the aluminum layer are sequentially deposited on the surface to be joined to the lid, and then the metal layer and the lid to be joined on the upper surface of the substrate. In addition, the lid body and the metal layer are joined together by a resistance welding method in which a current flows while rotating the roller, for example, along the outer edge of the lid body and the metal layer. The outer peripheral side is joined via an aluminum-gold-nickel alloy, and the inner peripheral side is joined via an aluminum alloy containing aluminum as a main component. Thereby, a strong and highly reliable joint can be formed.

  The electric double layer capacitor of the present invention is the above electric double layer capacitor case, a first electrode placed on the upper surface of the metallized layer and electrically connected thereto, and an upper surface of the first electrode impregnated with an electrolyte. And a second electrode that is placed in close contact via the separator and is electrically connected by being in contact with the lid body. The generation of the gap that occurred in the caulking portion of the can is eliminated and the intrusion of moisture from the gap is eliminated, so that the life of the electrolyte can be extended, and the component of the case for the electric double layer capacitor is the electrolyte. Since it hardly elutes into the inside, the characteristics of the electrolytic solution are not greatly impaired, and damage to the external electric circuit board due to leakage of the electrolytic solution can be eliminated.

  In addition, the electric double layer capacitor of the present invention comprises a lid body and a second electrode by bringing a wide surface of the lower main surface of the lid body made of an iron-based alloy into contact with a second electrode. , The resistance between the second electrode and the lid can be reduced, and charging and discharging can be efficiently performed without causing an electrical loss between the second electrode and the lid. Therefore, the electrical characteristics can be improved.

  The battery case and battery of the present invention will be described in detail below. FIG. 1 shows an example of an embodiment of a battery case according to the present invention. (A) is a cross-sectional view of the battery case, (b) is a plan view excluding a lid of the battery case, and FIG. (A) is a principal part enlarged view, FIG. 3 is sectional drawing which shows an example of embodiment of the battery of this invention.

  In these figures, reference numeral 1 denotes a ceramic substrate, 1a denotes a central portion of the upper surface of the substrate 1, a concave portion formed in a columnar shape such as a rectangular parallelepiped shape, a prismatic shape, or a cylindrical shape, and 1b denotes a bottom surface of the concave portion 1a. The formed metallized layer, 1b-A is a first internal wiring formed from the metallized layer 1b to the outer surface of the substrate, 1b-B is formed on the outer surface of the substrate 1, and the first internal wiring 1b-A and A first side conductor for electrically connecting the first conductor layer C, 2 is a side wall around the recess 1a of the substrate 1, 2a is a metal layer formed around the recess 1a on the upper surface of the substrate 1, and 2b is Corner wiring conductors formed vertically at the corners of the side walls 2 of the base 1 are denoted by 2c, second internal wirings formed at the lower ends of the side walls 2 of the bottom of the recesses 1a, and 2d are second internal wirings. 2c to the second conductor layer D provided on the lower surface of the base 1 The second side conductors C and D, which are electrically connected to each other, are respectively a first conductor layer and a second conductor layer which are provided on the lower surface of the base body 1 and are independent from each other. , K is a nickel layer, L is a gold layer, M is an aluminum layer, P is an aluminum-gold-nickel alloy, and Q is an aluminum alloy containing aluminum as a main component. A represents the battery case of the present invention, and B represents the battery of the present invention.

  3, B-1 is a positive electrode plate placed on the upper surface of the metallized layer 1b and electrically connected to the metallized layer 1b, B-3 is an insulating sheet, B-4 is an electrolytic solution, B -2 is placed in close contact with the upper surface of the positive electrode plate B-1 via an insulating sheet B-3 impregnated with the electrolytic solution B-4, and is in contact with and electrically connected to the lid 3. A negative electrode plate is shown. The same code | symbol was attached | subjected to the site | part which shows the same site | part as the case A for other batteries.

  In FIG. 2, the dotted lines indicating the ranges of the aluminum-gold-nickel alloy P and the aluminum alloy Q schematically show the respective regions, and do not limit the range of the regions. In the vicinity of the bonding region of these alloys, in a state where the respective materials are mixed, from the aluminum-gold-nickel alloy P on the outer peripheral side of the joint to the aluminum alloy Q mainly composed of aluminum on the inner peripheral side, It exists so that the density | concentration of each metal component may change continuously. 1 and 3, the nickel layer, the gold layer, and the aluminum layer are not shown.

Such a substrate 1 is made of an alumina (Al ₂ O ₃ ) sintered body, a mullite (3Al ₂ O ₃ .2SiO ₂ ) sintered body, an aluminum nitride (AlN) sintered body, glass ceramics, etc. For example, when the substrate 1 is made of an alumina sintered body, it is manufactured as follows. That is, an appropriate organic binder, solvent, etc. are added to and mixed with raw material powders such as aluminum oxide (Al ₂ O ₃ ), silicon oxide (SiO ₂ ), magnesium oxide (MgO), and calcium oxide (CaO) to form a slurry. This slurry is formed into a ceramic green sheet (hereinafter also referred to as a green sheet) by a doctor blade method or a calender roll method, and cut into a required size. Next, in order to form the recesses 1a, the first and second side conductors 1b-B, 2d, and the corner wiring conductor 2b in a plurality of green sheets selected from them, an appropriate punching process is performed.

  Then, a metal paste containing a metal powder such as tungsten (W) as a main component is printed and applied to these green sheets on predetermined portions, and then the metal layer 2a, metallized layer 1b, first and second internal wirings 1b-A. , 2c, first and second side conductors 1b-B, 2d, corner wiring conductor 2b, first and second conductor layers C, D are formed, and then these metal paste layers are formed. The substrate 1 is manufactured by laminating the green sheets and firing at a temperature of about 1600 ° C.

  In the battery case A, the base body 1 is not easily attacked by the electrolytic solution B-4 containing an organic solvent, an acid, or the like, and impurities dissolved from the base body 1 are mixed in the electrolytic solution B-4 and the electrolytic solution B-4 is mixed. There is no deterioration. For this reason, the battery case A which can maintain battery performance favorably can be obtained. Further, when the substrate 1 is made of an AlN sintered body, heat at the time of operation can be efficiently dissipated to the outside, so that the electrolytic solution hardly deteriorates due to heat and is highly reliable. A battery case A can be obtained.

  The first internal wiring 1b-A and the first side conductor 1b-B are electrically connected from the metallized layer 1b to the first conductor layer C to constitute a first wiring conductor. Further, the corner wiring conductor 2b, the second internal wiring 2c, and the second side conductor 2d are electrically connected from the metal layer 2a to the second conductive layer D to constitute a second wiring conductor. In the present embodiment, the first and second wiring conductors are realized by such a configuration, but are not limited to these, and the metallized layer, the first conductor layer, the metal layer, and As long as the second conductor layer is electrically connected, any configuration may be used. For example, the second wiring conductor is realized by a through conductor penetrating the inside of the base body 1 from the metal layer to the second conductor layer, and the first wiring conductor is similarly formed from the metallized layer 1b to the first conductor layer C. It may be realized by a through conductor penetrating through the inside of 1.

  In the present embodiment, the second internal wiring 2c is formed inside the base body 1 at the extension of the bottom surface of the recess 1a and is formed so as not to appear on the outer surface of the base body 1. This is because when the battery B is joined to the external electric circuit board, if the second internal wiring 2c is exposed on the side surface of the base 1, the second conductor layer D is connected to the external electric circuit board via solder. When soldering, the solder that has gone up through the second side conductor 2d flows laterally through the second internal wiring 2c, and the amount of solder for connecting the second conductor layer D is insufficient. This is to prevent a problem such as that.

  Further, the first side conductor 1b-B is formed on the outer surface of the base 1 from the lower end of the side wall 2 to the lower surface of the base 1, and the second side conductor 2d is similarly extended from the lower end of the side wall 2 to the lower surface of the base 1. By being formed on the outer surface of the substrate 1, the first side conductor 1b-B and the second side conductor 2d are formed to have the same height. As a result, when the battery B is joined on the external electric circuit board, the first and second side conductors 1b-B, 2d are joined with the balance of the solder meniscus, and the battery B is tilted and joined. And a sufficient bonding strength can be obtained.

  Such first side conductor 1b-B and second side conductor 2d do not necessarily have to be arranged at mutually opposing portions of the outer surface of the base 1, and are optimally arranged according to design convenience. However, it is preferable to form the first side conductor 1b-B and the second side conductor 2d on the outer surface of the base 1 facing each other in the following points.

  That is, the height of the first side conductor 1b-B is the same as the height of the second side conductor 2d. For this reason, in addition to the size of the solder meniscus being balanced, Since the one side conductor 1b-B and the second side conductor 2d are formed on the outer surface of the base 1 facing each other, the surface tension of the solder acts across the center of gravity of the base 1, The tombstone phenomenon (a phenomenon in which one side faces down because the surface tension of the solder acting on both sides of the electronic component is not uniform) can be prevented. As a result, workability at the time of mounting can be improved, and good joining reliability can be obtained in the joining of the wiring conductors of the external electric circuit board. Further, this arrangement is preferable because the longest insulation distance can be obtained between the side conductors 1b-B and 2d.

  In the example of FIG. 1, the first side conductor 1b-B and the second side conductor 2d are so-called conductors formed on the inner surfaces of the grooves formed in the vertical direction on the side surfaces on which the first side conductor 1b-B and the second side conductor 2d are arranged. It is a castellation conductor.

  When the first side conductor 1b-B and the second side conductor 2d are castellation conductors, a solder meniscus is formed on the concave surface of the castellation conductor to form a wiring conductor for the battery case A and the external electric circuit board. Can be firmly joined together and the state of solder joining can be visually confirmed, so that highly reliable joining can be achieved.

  In addition, although the battery case A of the present invention is shown as an example of a rectangular parallelepiped shape as shown in FIGS. 1 to 3, it may be a polygonal column shape, a cylindrical shape or the like in the vertical direction. There is no problem, and the shape of the conductor layer or the like can be changed to a desired shape to obtain a desired shape.

  Also, the metallized layer 1b, the metal layer 2a, the corner wiring 2b, the first and second side conductors 1b-B and 2d, the first and second conductors formed on the base 1 thus manufactured. On the surfaces of the layers C and D, a metal having excellent corrosion resistance and excellent wettability with solder, specifically, a nickel (Ni) layer having a thickness of 1 to 12 μm and a gold (Au) layer having a thickness of 0.3 to 5 μm It is preferable to deposit sequentially by a plating method or the like. As a result, these oxidation corrosions can be prevented and solder wettability can be improved during soldering, and a solder meniscus having a required size can be formed.

  Here, if the thickness of the Ni layer is less than 1 μm, it is difficult to prevent oxidative corrosion of each conductor made of metallization, and the conductive performance of these conductor layers is likely to deteriorate. On the other hand, if the thickness of the Ni layer exceeds 12 μm, it takes a long time to form the plating, and the mass productivity tends to decrease.

  If the thickness of the Au layer is less than 0.3 μm, it is difficult to form an Au layer having a uniform thickness, and the Au layer is likely to be very thin or no Au layer is formed. The prevention effect and wettability with solder are likely to be lowered. On the other hand, if the thickness of the Au layer exceeds 5 μm, it takes a long time to form the plating, and the mass productivity tends to decrease.

  Further, on the surfaces of the metallized layer 1b and the metal layer 2a that are in direct contact with the electrolytic solution, an aluminum (Al) layer M is further deposited on the surface of the plating film to a thickness of 1 to 15 μm, for example, by sputtering. Since aluminum has the characteristic that it is difficult to be attacked by the electrolytic solution B-4, W, which is the main metal component of the nickel layer, the gold layer, and the metallized layer 1b, is contained in the electrolytic solution B-4. Elution can be effectively suppressed. Further, since the Ni layer and the Au layer deposited on the first and second conductor layers C and D improve the wettability with the solder, the connection with the wiring conductor on the external electric circuit board (not shown) is possible. Strength becomes stronger.

  The aluminum layer M protects the conductive part from an electrolytic solution B-4 made of, for example, a lithium salt such as lithium tetrafluoroborate or an acid such as hydrochloric acid, sulfuric acid or nitric acid dissolved in an organic solvent such as dimethoxyethane or propylene carbonate. It is possible to prevent them from being corroded by the electrolytic solution B-4. The thickness of the aluminum layer M is preferably 1 to 15 μm, and if it is less than 1 μm, it is difficult to prevent corrosion by the electrolytic solution B-4, and the performance of the electrolytic solution B-4 is likely to deteriorate. In addition, if the thickness exceeds 15 μm, it takes a long time to form the layer, and in addition, it causes an increase in welding temperature when resistance welding such as seam welding is performed on the metal layer 2a. Absent.

  The above sputtering method causes argon atoms to be released from the aluminum surface into the space by colliding argon (Ar) ions or the like with the surface of the pellet-like aluminum that is a target installed in the decompressed space, This is a method using the phenomenon of adhering to the surface of an object placed in the vicinity, and is one of the most suitable methods for forming the aluminum layer M in that a dense film can be formed. In addition to this sputtering method, the aluminum layer M can be formed by vapor deposition, plating, or welding.

  First and second conductor layers C and D are formed on the lower surface of the base 1, and the first and second conductor layers C and D are connected to the wiring conductor on the surface of the external electric circuit board via solder. The battery B of the present invention is connected to an external electric circuit by being joined.

  Thus, since the first and second conductor layers C and D can be directly joined to the wiring conductor on the surface of the external electric circuit board via solder, according to the battery case A of the present invention, the external It is possible to easily connect to the wiring conductor on the surface of the external electric circuit board by surface mounting without using a connection terminal member or the like, and the mass productivity is excellent.

  In the present invention, each of the first and second conductor layers C and D is preferably divided into a plurality of parts. Thereby, the contact area between the first and second conductor layers C and D and the external electric circuit board is reduced, and the heat from the solder melted when the battery case A is soldered to the external electric circuit board, Transmission to the first and second conductor layers C and D can be effectively suppressed. As a result, application of thermal stress to the battery case A can be effectively suppressed, and the airtight reliability of the battery case A can be greatly improved.

  Further, the first and second conductor layers C and D may be formed on the lower surface of the protruding portion provided on the lower surface of the base 1. As a result, even if the external electric circuit board is warped, it can be reliably connected to the electrode on the surface of the external electric circuit board, and the connection reliability is improved. Further, since the side surface of the protruding portion is in contact with the outside air over the entire circumference, the cooling effect is increased, and heat from the solder melted when the battery case A is soldered to the external electric circuit board is transmitted to the battery case A. It is possible to effectively prevent the battery case A from being distorted.

  The lid 3 is made of an iron-based alloy such as iron (Fe) -Ni-cobalt (Co) or Fe-Ni, and a metal plate having a thickness of 0.2 to 0.5 mm is matched to the outer shape of the upper surface of the substrate 1 and cut into a square shape, for example. Then, a nickel layer K having a thickness of 2 to 5 μm and an aluminum layer M having a thickness of 1 to 10 μm are sequentially deposited on at least a lower surface portion by a plating method or the like.

  When the lid 3 and the metal layer 2a of the battery case A of the present invention are joined, the metal layer 2a having a thickness of 10 to 20 μm formed around the recess 1a on the upper surface of the base 1 as described above. A nickel layer K having a thickness of 1 to 12 μm, a gold layer L having a thickness of 0.3 to 5 μm, and an aluminum layer M having a thickness of 1 to 15 μm are sequentially deposited on the surface. A nickel layer K having a thickness of 2 to 5 μm and an aluminum layer M having a thickness of 1 to 10 μm are sequentially deposited on the surface to be joined to the layer 2 a, and then the metal layer 2 a and the lid are formed on the upper surface of the substrate 1. The lid 3 is placed together with the surfaces to be joined, and then joined by a resistance welding method, for example, a seam welding method, in which a current is passed to the outer ends of the lid 3 and the metal layer 2a.

  The seam welding method is a method of forming a welded portion in a linear shape by energizing while rotating the side portion of the conical roller along the parts to be joined. As the resistance welding method, there are a spot welding method, a TIG welding method, and the like in addition to the seam welding method, but the seam welding method is preferable in that it can be welded in a linear shape and airtightness is improved.

  Then, by applying this seam welding to the outer peripheral end of the lid 3, a large current flows near the outside of the joint between the lid 3 and the metal layer 2 a, and the metal layer 2 a and the lid in a very short time. 3, the outer aluminum layer M and the nickel layer K applied to the joint portion 3 are melted and become eutectic at about 800 to 900 ° C., and a small amount of gold in the gold layer K is taken in. An aluminum-gold-nickel alloy P is formed in a frame shape. As a result, a highly reliable and strong bonded state can be realized via the aluminum-gold-nickel alloy P on the outer peripheral side of the bonded portion.

  In addition, since the current flowing away from the part away from the roller, that is, closer to the inner side of the joint portion, the welding temperature becomes slightly higher than the melting point of aluminum (663 ° C.), thereby the metal layer 2a and the lid 3 The aluminum layer M applied to the joint portion can be mainly melted to form an aluminum alloy Q mainly composed of aluminum in a frame shape on the inner peripheral side of the joint portion. As a result, the inner peripheral side of the joined portion can be a joined portion joined by an aluminum alloy Q mainly composed of aluminum that is hardly damaged by the electrolyte B-4 filled in the battery B. The temperature of these joints can be controlled by the magnitude of the current applied to the roller, the rotation speed of the roller, and the pressing pressure of the roller, and the above temperature distribution can be realized.

  Furthermore, according to this manufacturing method, the resistance increases because the current flows from the outer peripheral side of the joint at the joint farthest from the roller (the end on the inner peripheral side of the joint), and as a result, current is applied. Since the current is reduced, a temperature distribution close to the melting temperature of aluminum (663 ° C.) can be created at this joint. Therefore, the aluminum layer M on the lid 3 side and the aluminum layer M on the metal layer 2a side are melted and integrated near the inner side, and a joint portion of the aluminum-gold-nickel alloy P on the outer peripheral side and the unbroken aluminum alloy Q is formed. This makes it possible to achieve a structure that is difficult to be attacked by the electrolytic solution B-4. Thereby, the malfunction that electrolyte solution B-4 penetrate | invades in the inside of a junction part is prevented reliably.

  In an example of the present embodiment, in the seam welding, one end of the welding electrode is connected to the second conductor layer D on the lower surface of the battery case A, and the lid 3 is covered on the upper surface of the base 1 with the recess 1a. The outer peripheral side is moved by moving the seam welding roller at about 10 mm / second while passing a current of about several amperes from the top of the lid 3 to the outer peripheral ends of the lid 3 and the metal layer 2a. A battery case A was obtained which was joined via an aluminum-gold-nickel alloy P and the inner peripheral side was joined via an aluminum alloy Q whose main component was aluminum. As a result, an aluminum-gold-nickel alloy P containing 60 to 70% by mass of aluminum, 1 to 2% by mass of gold, and 28 to 39% by mass of nickel on the outer peripheral side of the joint between the lid 3 and the metal layer 2a. On the inner peripheral side, aluminum alloy Q containing 99% by mass or more of aluminum as a main component was obtained.

  Next, the battery B of the present invention will be described in detail below.

  The battery B of the present invention includes the above-described battery case A, a positive electrode plate B-1 placed on and electrically connected to the upper surface of the metallized layer 1b, and an electrolysis on the upper surface of the positive electrode plate B-1. A negative electrode plate B-2 placed in close contact with the porous insulating sheet B-3 impregnated with the liquid B-4 and electrically connected by contacting the lid 3 doing.

  In addition, if a bonding material mainly composed of carbon is interposed between the metallized layer 1b and the positive electrode plate B-1 and between the negative electrode plate B-2 and the lower main surface of the lid 3, these are used. The electrical connection between the two can be more reliably performed.

  By using the battery case A of the present invention, the battery B becomes a battery B that has a highly reliable airtightness and can repeat stable charging and discharging, and the first and second conductor layers C. , D can be easily connected to the wiring conductor of the external electric circuit board by soldering or the like, and the mass productivity of the external electric circuit board is excellent.

The positive electrode plate B-1 is a plate or sheet having a positive electrode active material such as LiCoO ₂ or LiMn ₂ O ₄ and a conductive material such as acetylene black or graphite, and the negative electrode plate B-2 is It is a plate or sheet containing a negative electrode active material made of a carbon material such as coke or carbon fiber.

  The positive electrode plate B-1 is obtained by adding a binder such as polytetrafluoroethylene or polyvinylidene fluoride to the positive electrode active material added with the conductive material, and mixing it to form a slurry. This is a well-known doctor blade method. For example, the sheet is formed into a sheet shape using, for example, and then cut into a square shape.

  Similarly, the negative electrode plate B-2 is made into a slurry by adding and mixing a binder such as polytetrafluoroethylene or polyvinylidene fluoride to the negative electrode active material, and this is made into a sheet using a known doctor blade method or the like. Then, the sheet is produced by cutting the sheet into, for example, a square shape.

  The insulating sheet B-3 is made of a non-woven fabric made of polyolefin fiber, a microporous membrane made of polyolefin, and the like, impregnated with the electrolytic solution B-4, and between the positive electrode plate B-1 and the negative electrode plate B-2. By being disposed between, the contact between the positive electrode plate B-1 and the negative electrode plate B-2 is prevented, and the movement of lithium ions between the positive electrode plate B-1 and the negative electrode plate B-2 is prevented. Make it possible.

  In producing the battery B, the metallized layer 1b, the positive electrode plate B-1, the insulating sheet B-3, the negative electrode plate B-2, and the lid 3 were energized along the edge of the lid 3 so that they were in close contact with each other. The lid 2 is bonded to the upper surface of the substrate 1 by melting the aluminum layer M, the gold layer L, and the nickel layer K on the surface of the lid 3 and the surface of the metal layer 2a by rotating the roller while pressing lightly. .

  The electrolytic solution B-4 filled in the battery case A is obtained by dissolving a lithium salt such as lithium tetrafluoroborate or an acid such as hydrochloric acid, sulfuric acid or nitric acid in an organic solvent such as dimethoxyethane or propylene carbonate. It is.

  Such an electrolytic solution B-4 is highly corrosive and soluble, but by using the battery B of the present invention, the substrate 1 made of ceramics has excellent chemical resistance, and an organic solvent, acid, etc. In addition, since the impurities dissolved from the battery case A are not mixed in the electrolytic solution B-4, the electrolytic solution B-4 is not deteriorated. For this reason, battery performance can be maintained satisfactorily.

  Further, in a battery case using a conventional battery case made of stainless steel, as shown in FIG. 4, the positive electrode can 11 and the negative electrode can 12 are caulked around a gasket 15 made of polypropylene resin or the like. Since the thickness of the caulked portion is about 2 mm in combination with the positive electrode can 11, the negative electrode can 12 and the separator 14, according to the present invention, there is no caulking portion. The outer shape of the battery B can be reduced, which can greatly contribute to the downsizing and thinning of the portable device.

  Furthermore, according to the battery B of the present invention, electrolysis is performed in the battery case A formed by the lid 3 that is firmly and reliably joined to the metal layer 2a of the base body 1 by a resistance welding method such as a seam welding method. Since the liquid B-4 is accommodated, even when exposed to a temperature cycle test, a gap due to cracks or the like does not occur in the battery case A due to thermal stress, and the electrolyte B-4 does not leak, and the lid 3 does not come off and the electrolytic solution does not leak from the gap between the lid 3 and the substrate 1, so that the battery B can be operated over a long period of time.

  Further, the lid 3 can be brought into electrical contact with the upper surface of the negative electrode plate B-2, and the negative electrode plate B can be electrically connected by connecting the lid 3 and the negative electrode plate B-2 over a wide area. -2 and the lid 3 can be greatly reduced, and can be charged and discharged efficiently, so that the battery B is highly reliable and can be charged and discharged stably over a long period of time. .

  Next, the electric double layer capacitor case A and the electric double layer capacitor B of the present invention have the same configuration and operational effects as the battery case A and battery B described above.

  That is, the electric double layer capacitor case A of the present invention has a rectangular parallelepiped, prismatic, or cylindrical recess 1 a formed at the center of the upper surface of the substrate 1. A metallized layer 1 b is formed on the bottom surface of the recess 1 a, and a metal layer 2 a is formed around the recess 1 a on the top surface of the substrate 1. Further, a first conductor layer C and a second conductor layer D are provided on the outer surface of the base 1, and the first internal wiring 1b-A and the first side conductor 1b-B are formed from the metallized layer 1b. These are electrically connected over the first conductor layer C to form a first wiring conductor. Further, the corner wiring conductor 2b, the second internal wiring 2c, and the second side conductor 2d are electrically connected from the metal layer 2a to the second conductive layer D to constitute a second wiring conductor. The lid 3 made of a flat iron-based alloy is joined to the metal layer 2a via the aluminum-gold-nickel alloy P on the outer peripheral side, and the inner peripheral side of the joint between the lid 3 and the metal layer 2a. And joined through an aluminum alloy Q mainly composed of aluminum.

  The electric double layer capacitor B of the present invention includes the electric double layer capacitor case A described above and a first electrode B− placed on the upper surface of the metallized layer 1b and electrically connected to the metallized layer 1b. 1 and the second electrode 1 placed in close contact with the first electrode B-1 via the separator B-3 impregnated with the electrolyte B-4 and electrically connected to the lid 3 Electrode B-2.

The first electrode B-1 and the second electrode B-2 are obtained by, for example, carbonizing activation of phenol resin fibers (novoloid fibers), and the activation is performed in a high temperature atmosphere of 800 to 1000 ° C. It is carried out by bringing it into contact with an activation gas such as high-temperature steam, and gasifies volatile components or part of carbon atoms in the carbide, mainly developing a fine structure of 1 to 10 nm to increase the internal surface area to 1 × 10 ⁶ m ^2. / Kg or more. The electric double layer capacitor B of the present invention has no polarity in the first and second conductor layers C and D, and the first conductor layer C side can be used as an anode, and the second conductor layer D side can be used as a cathode. The reverse polarity can also be used.

The electrolytic solution B-4 is, for example, a lithium salt such as lithium hexafluorophosphate (LiPF ₆ ) or a quaternary ammonium salt such as tetraethylammonium tetrafluoroborate ((C ₂ H ₅ ) ₄ NBF ₄ ) using propylene carbonate. It is dissolved in a solvent such as (PC) or sulfolane (SLF).

  In addition, for the separator B-3, for example, glass fiber, polyphenylene sulfide, polyethylene terephthalate, polyamide or other heat-resistant resin is used.

  The electric double layer capacitor B is placed on the upper surface of the metallized layer 1b so that the first electrode B-1, the separator B-3, the second electrode B-2, and the lid 3 are in close contact with each other. After injecting the electrolyte B-4, the roller 3 energized along the edge of the upper surface of the lid 3 by seam welding is rotated and moved, and the lid 3 is joined by the generated Joule heat. Alternatively, an electric double layer capacitor B is obtained when the lid 3 is joined to the upper surface of the substrate 1 by melting the metal deposited on the lower surface of the lid 3 and the surface of the metal layer 2a by using an ultrasonic welding method. .

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the battery case or the electric double layer capacitor B using the battery case or the electric double layer capacitor case A having one recess 1a has been described, but the battery case or the electric double layer capacitor case having a plurality of recesses 1a. In this case, the lid 3 may be a single lid 3 that covers all the recesses 1a, or a plurality of lids 3 that cover the respective recesses 1a may be attached. . When the battery case or the electric double layer capacitor case A having a plurality of recesses 1a is used in this way, the battery or the electric double layer capacitor B produced in each of the recesses 1a is connected in parallel so as to increase the capacity. A battery or an electric double layer capacitor B can be used, and a battery B that can supply a high voltage by being connected in series can be used.

  Furthermore, in the present invention, the battery case or the electric double layer capacitor case A and the battery or the electric double layer capacitor B in which the lid body 3 is directly joined to the ceramic base body 1 have been described. A seal ring made of Fe-Ni-Co alloy or the like may be interposed between the metal layer 2a, and after brazing the seal ring with Ag brazing on the upper surface of the metal layer 2a, a nickel layer K, a gold layer L and aluminum are formed on the surface. The layer M may be formed, and then the lid 3 may be joined together with the lid 3 by resistance welding. In this case, even if the base body 1 is deformed, the deformation can be absorbed by the seal ring.

An example of embodiment of the case for batteries and the case for electric double layer capacitors of the present invention is shown, (a) is a sectional view of the case for batteries and the case for electric double layer capacitors, (b) is the case for batteries and the electric double layer. It is a top view except the cover of the multilayer capacitor case. It is a principal part expanded sectional view of Fig.1 (a). It is sectional drawing which shows an example of embodiment of the battery and electric double layer capacitor of this invention. It is sectional drawing which shows the example of the conventional coin type battery.

Explanation of symbols

1: Base 1a: Recess 1b: Metallized layer 2: Side wall 2a: Metal layer 3: Cover A: Battery case, electric double layer capacitor case B: Battery, electric double layer capacitor B-1: Positive electrode plate One electrode B-2: Negative electrode plate, second electrode B-3: Insulating sheet, separator B-4: Electrolytic solution C: First conductor layer D: Second conductor layer K: Nickel layer L: Gold Layer M: Aluminum layer P: Aluminum-gold-nickel alloy Q: Aluminum alloy

Claims (6)

A base made of ceramics in which a recess is formed in the central portion of the upper surface, and a first conductor layer and a second conductor layer are provided independently on the lower surface; a metallization layer formed on the bottom surface of the recess; A first wiring conductor formed from the metallized layer to the first conductor layer, a metal layer formed around the recess on the upper surface of the base, and formed from the metal layer to the second conductor layer A second wiring conductor; and a lid made of an iron-based alloy. The lid and the metal layer are bonded to each other on the outer peripheral side through an aluminum-gold-nickel alloy, and the inner peripheral side is made of aluminum. A battery case characterized by being bonded via an aluminum alloy as a main component. 2. The method for manufacturing a battery case according to claim 1, wherein when the lid and the metal layer are joined, a nickel layer, a gold layer, and an aluminum layer are sequentially deposited on the surface of the metal layer. A nickel layer and an aluminum layer are sequentially deposited on the surface to which the lid is to be joined, and then the lid is placed on the upper surface of the base with the metal layer and the surface to be joined to the lid being joined. Then, the battery case manufacturing method is characterized in that the lid and the metal layer are joined to each other on the outer peripheral side by a resistance welding method in which a current flows. The battery case according to claim 1, a positive electrode plate placed on and electrically connected to the upper surface of the metallized layer, and an upper surface of the positive electrode plate are closely attached via an insulating sheet impregnated with an electrolyte. And a negative electrode plate that is placed and is in contact with and electrically connected to the lid. A base made of ceramics in which a recess is formed in the central portion of the upper surface, and a first conductor layer and a second conductor layer are provided independently on the lower surface; a metallization layer formed on the bottom surface of the recess; A first wiring conductor formed from the metallized layer to the first conductor layer, a metal layer formed around the recess on the upper surface of the base, and formed from the metal layer to the second conductor layer A second wiring conductor; and a lid made of an iron-based alloy. The lid and the metal layer are bonded to each other on the outer peripheral side through an aluminum-gold-nickel alloy, and the inner peripheral side is made of aluminum. A case for an electric double layer capacitor, characterized by being bonded via an aluminum alloy as a main component. 5. The method for manufacturing a case for an electric double layer capacitor according to claim 4, wherein when the lid and the metal layer are joined, a nickel layer, a gold layer, and an aluminum layer are sequentially coated on the surface of the metal layer. And a nickel layer and an aluminum layer are sequentially deposited on the surface to which the lid is to be joined, and then the upper surface of the base is combined with the surface to be joined to the lid and the lid. And then joining the lid and the end of the metal layer on the outer peripheral side by a resistance welding method in which a current is passed. A case for an electric double layer capacitor according to claim 4, a first electrode placed on and electrically connected to the upper surface of the metallized layer, and a separator impregnated with an electrolyte on the upper surface of the first electrode. An electric double layer capacitor comprising: a second electrode placed in close contact with each other and being in contact with and electrically connected to the lid.

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