Abstract: The invention relates to a fuel cell stack, a fuel cell system, and a vehicle having such a fuel cell system. The fuel cell stack comprises a stack of membrane electrode assemblies and bipolar plates arranged in alternation between two end plates and comprises main supply channels for supplying and discharging operating media for the fuel cell stack which main supply channels extend through the stack in the stacking direction of the stack. It is provided that means for retaining particles be provided in at least one of the main supply channels.

Abstract: The present invention provides a sealing apparatus having a structure in which an application area of pressure and heat is increased by a pair of sealing blocks and a pressurization part extending from the sealing block. In the sealing apparatus according to the present invention based on the structure, when the sealing-planned part is pressurized, heat and pressure may be applied to the sealing-planned part or an insulating film to be extended, and thus an electrode lead and the sealing-planned part adjacent thereto may be firmly bonded.

Abstract: A method for producing at least one electrochemical cell of a solid-state battery, comprising a mixed-conducting anode, a mixed-conducting cathode, and an interposed electrolyte, is characterized in that a mixed-conducting anode and a mixed-conducting cathode are initially produced or provided. The surface of at least one of the two electrodes is modified by way of an additional method step in such a way that the electronic conductivity perpendicular to the cell is reduced to less than 10?8 S/cm in a layer of the electrode near the surface. The anode and cathode are then assembled to form a solid-state battery in such a way that the surface-modified layer of at least one electrode is disposed as an electrolyte layer between the anode and cathode, and the mixed-conducting electrodes are thereby electronically separated.

Abstract: A metal-air battery including: a negative electrode metal layer; a negative electrode electrolyte layer disposed on the negative electrode metal layer; a positive electrode layer disposed on the negative electrode electrolyte layer, the positive electrode layer comprising a positive electrode material which is capable of using oxygen as an active material; and a gas diffusion layer disposed on the positive electrode layer, wherein the negative electrode electrolyte layer is between the negative electrode metal layer and the positive electrode layer; wherein the negative electrode metal layer, the negative electrode electrolyte layer, and the positive electrode layer are disposed on the gas diffusion layer so that the positive electrode layer contacts a lower surface and an opposite upper surface of the gas diffusion layer, and wherein one side surface of the gas diffusion layer is exposed to an outside.

Abstract: A process forms a Li-ion battery cell including an LNMO-based cathode material, an anode material, a separator and an electrolyte. The process successively includes charging the cell until the cell reaches a state of charge of 100%, storing the cell in the state of charge of 100% in an open circuit for a period of time of at least 48 hours, and removing gas generated during the charging and the storage.

Abstract: A current collecting lead is interposed between a sealing body and a positive electrode current collector for connecting the sealing body and the positive electrode current collector, the sealing body including a positive electrode terminal, the positive electrode current collector being attached to an electrode group, the current collecting lead including: a top wall portion positioned on the side of the sealing body; leg portions positioned on the side of the positive electrode current collector and that face the top wall portion; and a pair of side wall portions that extend between side edges of the top wall portion and side edges of the leg portions and that face each other, a first corner portion and a second corner portion formed by the top wall portion and the side wall portions and a third corner portion and a fourth corner portion formed by the leg portions and the side wall portions being rounded corners that are curved.

Abstract: Provided in the present invention is a redox flow battery including a positive electrode, a negative electrode and a separation membrane, wherein a positive electrode electrolyte composed of an aqueous solution containing vanadium ions is supplied into a positive electrode chamber, and a negative electrode electrolyte composed of an aqueous solution containing vanadium ions is supplied into a negative electrode chamber, to carry out charging and discharging of the battery. In the redox flow battery, zirconium or titanium coated with a noble metal or a compound thereof is used as a positive electrode material, and when the positive electrode material is zirconium coated with a noble metal or a compound thereof, the positive electrode electrolyte and the negative electrode electrolyte contain sulfuric acid; and when the positive electrode material is titanium coated with a noble metal or a compound thereof, the positive electrode electrolyte contains nitric acid.

Abstract: A method of manufacturing a short-preventive all-solid-state battery in which a thermosetting insulating resin applied in advance to a pouch-type electrode case provided with an electrode assembly received therein is forced to fill a space between the edges of the electrode assembly during packaging of the electrode assembly to fill vacant spaces between electrodes at the edges of the electrode assembly and may thus prevent physical contact and collision between the electrodes and fundamentally prevent generation of a short circuit caused thereby.

Abstract: A battery container includes a flexible pack including an accommodation region; and at least one reservation region substantially connected to the accommodation region; and a battery set that is bent and disposed within the accommodation region, and that has two ends, at least one end forming a fan-shaped end after bending, and being disposed within one reservation region, and that includes a plurality of battery cells that are stacked and electrically connected; at least one friction-reducing layer disposed on at least one surface of each battery cell; and at least one fixing element that fixes the plurality of battery cells to one another, wherein the two ends have respective shapes that are due to different deformations of each battery cell of the plurality of battery cells as the flexible pack and the battery set are bent. Structural integrity, safety and bending ability of the battery set is greatly improved.

Abstract: Provided is an electricity storage module including an electricity storage element group composed of multiple electricity storage elements having exhaust ports that discharge gas produced therein, and a cover attached to the electricity storage element group, wherein the electricity storage element group has exhaust surfaces on which the exhaust ports are arranged, and the cover is attached so as to cover the exhaust surfaces, guide walls that surround the exhaust ports in the form of loops are formed in the respective electricity storage elements, guide ribs that come into close contact with the guide portions and fit therein are formed on an opposing surface of the cover that opposes the exhaust surfaces, and the cover is provided with a duct that communicates with the exhaust ports and through which gas discharged from the exhaust ports passes.

Abstract: A battery module includes a housing having a wall. The wall includes an opening extending from an inner surface of the wall facing an interior of the housing to an outer surface of the wall opposite to the inner surface. The battery module also includes a connector barrel having a first open end, a second open end, and a body portion extending between the first and second open ends. The body portion is positioned within the opening of the wall, the first open end is positioned within the interior of the housing, and the second open end is positioned external to the housing. A ridge on the body portion is disposed proximate to the outer surface of the wall, and a first circumferential bump on the body portion is disposed proximate to the inner surface of the wall. The battery module also includes a securement component disposed within a space defined by the first circumferential bump of the connector barrel. The wall is sandwiched between the ridge of the connector barrel and the securement component.

Abstract: An energy storage apparatus including: an energy storage device; and an outer housing including a bottom surface, a side wall extending from the bottom surface in a first direction that intersects the bottom surface, and a support member that supports the side wall. An end of the side wall in the first direction is positioned in a first region that is further in the first direction than an end of a case of the energy storage device in the first direction. The support member is connected to the side wall in at least the first region and supports the side wall.

Abstract: Disclosed is a method of packaging a power amplifier module. The method of packaging a power amplifier module includes providing a unified pattern including a ceramic layer and a pattern formed on the ceramic layer, bonding the unified pattern on a metal layer, and depositing a ceramic sidewall, on which at least one external signal connection lead line is formed, on the unified pattern bonded the metal layer.

Abstract: In initial charge and discharge, decomposition products or a gas is generated, degrading a battery. At least one of solvents (e.g., ethylene carbonate) used for an electrolytic solution is brought into contact with a positive electrode and a negative electrode and then charge is performed to some degree, and after that, a different solvent or electrolytic solution (e.g., ethyl methyl carbonate or vinylene carbonate) was added to adjust the electrolytic solution and then charge is performed. Through this process, stable coating films are formed in initial charge and discharge, which stably inhibits a side reaction between the electrolytic solution and an active material.

Abstract: A lithium-ion secondary battery (100) includes a wound electrode body (80), a nonaqueous electrolyte, and a box-shaped case (50). The wound electrode body includes a positive electrode (10), a negative electrode (20), and a separator (40). The box-shaped case contains the wound electrode body and the nonaqueous electrolyte. The wound electrode body includes a starting-end-side negative electrode remainder portion (22) provided in a winding-direction starting end portion (81) of the wound electrode body. The winding-direction starting end portion exists at a winding center side. The starting-end-side negative electrode remainder portion protrudes toward the winding center side along a winding direction beyond the positive electrode. A surplus nonaqueous electrolyte exists in a gap between the wound electrode body and the box-shaped case.

Abstract: A fuel cell stack includes a plurality of cell modules each formed by stacking a plurality of fuel cells, each of the plurality of fuel cells having a membrane electrode assembly having an insulating member at an outer periphery portion thereof and paired separators sandwiching the membrane electrode assembly, and by attaching the insulating members of adjacent fuel cells together, and a seal plate interposed between the stacked cell modules. The seal plate includes a plurality of manifold holes from which two power-generation gases flow separately through the plurality of fuel cells, and a first seal member provided along a peripheral portion of each of the plurality of manifold holes to seal a corresponding one of the two power-generation gases flowing through the manifold hole.

Abstract: A battery including a power generating element, a first sealant, a first holding member holding the first sealant, and an outer case enclosing the power generating element, wherein the first sealant and the first holding member are enclosed in the outer case together with the power generating element, and the first holding member holds the first sealant by enclosing the first sealant in a state in which the first sealant is not in contact with the power generating element.

Abstract: A method for assembling a fuel cell stack for a vehicle is provided wherein the method includes the steps of: (1) providing a batch of fuel cells having varying active area thicknesses among each fuel cell; (2) measuring an active area thickness for each fuel cell in the batch of fuel cells and sorting each fuel cell in the batch of fuel cells into one of a first group, a second group, and a third group based on the active area thickness for each fuel cell; (3) assembling a target number of fuel cells to a target height from at least one of the first, second and third groups onto a first end plate; and (4) affixing a second end plate to the target number of fuel cells and the first end plate thereby creating a fuel cell stack.

Abstract: A taping machine includes: a conveyor to convey the battery cell to a taping part and a finish processing part in this order; a tape supply part configured such that the insulation tape is wound therearound and is moved while being unwound in a direction corresponding to a moving direction of the conveyor; a taping part for attaching the insulation tape to the battery cell, the taping part being configured to cut the insulation tape positioned thereon into a length of 80% to 100% of the length of a to-be-insulated portion and temporality attach the cut insulation tape to the to-be-insulated portion; and a finish processing part for attaching the tape to the battery cell, the finish processing portion pressing the insulation tape in a state in which the battery is received from the taping part so that the insulation tape is attached to the entire to-be-insulated portion.

Abstract: Hearing devices configured to fit within the bony portion of the ear canal and batteries that may be used with same.

Abstract: A hybrid energy storage device includes a positive pole formed by stacking a supercapacitor first electrode and a battery positive electrode, a negative pole formed by stacking a supercapacitor second electrode and a battery negative electrode, and a separator located between the positive pole and the negative pole. The supercapacitor second electrode, the battery negative electrode, the supercapacitor first electrode, the battery positive electrode, and the separator are planar structures. The supercapacitor first electrode, the supercapacitor second electrode, the battery positive electrode, the battery negative electrode, the separator and electrolyte are packaged in a shell.

Abstract: A power storage unit or the like which has flexibility is achieved. An exterior body has projections and depressions. For example, part of the exterior body has projections and depressions in a wave cross-sectional shape. The shape of the projections and depressions is not limited to a shape with a curve and may be a shape with a straight line, such as a rectangle wave shape or a triangle wave shape. The projections and depressions allows the exterior body to be easily shrunk on the inner side of a bend portion and easily stretched on the outer side of the bend portion.

Abstract: Disclosed is a positive electrode mix for secondary batteries including an irreversible additive. More particularly, provided is a positive electrode mix for secondary batteries including an irreversible additive that decreases irreversible efficiency of a positive electrode active material and a positive electrode.

Abstract: A battery cell is formed to efficiently use unoccupied space in an electronic device. The battery cell may be formed by disposing an electrically insulating material on at least a first surface of a circuit board having components to create an electrical barrier and disposing a battery cell on the electrically insulating material. In some embodiments, a portion of the battery cell is configured to be partially disposed between components of the circuit board components, thus utilizing previously unoccupied space in the electronic device to store energy.

Abstract: Provided is a bipolar battery current collector that includes a conductive resin layer formed in such a manner as to, when at least part of the conductive resin layer reaches a predetermined temperature, interrupts a flow of electric current through the at least part of the conductive resin layer in a vertical direction thereof. Also provided is a bipolar battery using the current collector. It is possible by the use of the current collector to suppress local heat generation in the bipolar battery and improve the durability of the bipolar battery.

Abstract: A sub-assembly for an electrochemical stack, such as a PEM fuel cell stack, has a bipolar plate with sealing material extending from its upper face, around the edge of the bipolar plate, and onto its lower face. The bipolar plate is preferably a combination of an anode plate and a cathode plate defining an internal coolant flow field and bonded together by sealing material which also provides a seal around the coolant flow field. All of the sealing material in the sub-assembly may be one contiguous mass. To make the sub-assembly, anode and cathode plates are loaded into a mold. Liquid sealing material is injected into the mold and fills a gap between the edge of the plates, and portions of the outer faces of the plates, and the mold. In a stack, sub-assemblies are separated by MEAs which at least partially overlap the sealing material on their faces.

Abstract: A method for manufacturing an electrochemical energy store, includes: a) providing a temperature control plate, the temperature control plate at least partially including a heat-conducting material, and at least one contact area of the temperature control plate being deformable or transferable into a deformable state with the aid of an energy input; b) if necessary, bringing at least one contact area of the temperature control plate into a deformable state with the aid of an energy input; c) applying at least one cell to at least one contact area; and d) setting at least the at least one contact area of the temperature control plate. Also described is an electrochemical energy store.

Abstract: This invention provides a method of manufacturing a nonaqueous electrolyte secondary batteries which includes placing an electrode assembly in a hermetically sealable battery case, injecting a nonaqueous electrolyte into the battery case after the battery case has been set in a pressure-reduced state, and sealing the battery case under atmospheric pressure conditions. Sealing of the battery case is carried out before a given amount of the injected electrolyte completely impregnates the interior of the electrode assembly. As a result, the remaining nonaqueous electrolyte impregnates the interior of the electrode assembly after sealing, thereby making the pressure of voids within the battery case lower than atmospheric pressure.

Abstract: A method of remanufacturing a liner panel for a gas turbine engine includes removing a bushing from a damaged component; and molding the bushing with a material charge. A liner panel for a gas turbine engine includes a forward fan exit case liner panel with a donor bushing from a damaged forward fan exit case liner panel. A liner panel for a gas turbine engine includes a forward fan exit case liner panel molded from a material charge that includes a multiple of layers. At least one of the multiple of layer includes a discontinuity.

Abstract: A sealing body of a battery includes a positive electrode cap, a safety valve electrically connected to the positive electrode cap, a plurality of protrusions that are disposed annularly and intermittently on the outer peripheral side of a conductive contact part of the safety valve and that are each formed so as to be inclined toward the center of the sealing body, and an insulating member that covers at least top parts of the plurality of protrusions, side surfaces thereof on the center side, and a surface of the safety valve on the center side, that is fitted to the center side of the plurality of protrusions, whose vertical sectional shape is bent in a Z-shape. A terminal plate is fitted and fixed to the center side of the insulating member and is connected by welding to the conductive contact portion through a central opening of the insulating member.

Abstract: A method for producing an electrode-membrane-frame assembly according to the present invention includes arranging a previously molded first molded body on a circumferential region of first catalyst layer close to first gas diffusion layer, arranging a previously molded second molded body on a circumferential region of second catalyst layer close to second gas diffusion layer, and forming a third molded body by injection molding so as to integrally connect the first molded body and the second molded body and not to be directly in contact with an inner side region of second main surface of a polymer electrolyte membrane positioned on an inner side of an outer edge part of the second molded body when viewed from a thickness direction of the polymer electrolyte membrane, whereby a frame having the first, second, and the third molded body is formed. Thus, the polymer electrolyte membrane can be prevented from deteriorating.

Abstract: A method and apparatus for the production of wound elements. The method comprising: providing a plurality of first electrical web elements; disposing at least one of the first electrical web elements upon a conveying element, wherein a first or second face of the disposed first electrical web elements is disposed in a face to face relationship with the conveying element; providing a plurality of second electrical web elements; disposing at least one of the second electrical web elements upon the conveying element at a predetermined spacing from the disposed first electrical web elements and in a face to face relationship with the conveying element, wherein the predetermined spacing is at least as long as the length of the first electrical web element; and disposing an electrically insulating separator web element in a face to face relationship with the disposed electrical web elements.

Abstract: Machine for obtaining cells for electric storage batteries, comprising an apparatus for feeding two continuous strips of dielectric material, a first and a second apparatus for distributing first electrodes of the same polarity and a third apparatus for distributing between the two strips second electrodes with opposite polarity with respect to the first electrodes. The machine further includes a folding head which receives, from the feeding apparatus, the two strips with the second electrode interposed, and is movable between a first position in which it receives a first electrode from the first distribution apparatus, and a second position (B), in which it receives a first electrode from the second distribution apparatus, in order to form a stack of composite layers alternated with the electrodes.

Abstract: This relates to a sinterable composite electrolyte compound, a sintered composite electrolyte, a method for manufacturing a sintered composite electrolyte and the use of the sintered composite electrolyte in a fuel cell, preferably a solid oxide fuel cell, an exhaust gas probe or a high-temperature gas sensor, and a fuel cell, preferably a solid oxide fuel cell, exhaust gas probe or high-temperature gas sensor containing the sintered composite electrolyte.

Abstract: According to one embodiment, a solid electrolyte secondary battery includes a positive electrode containing an active material, a negative electrode containing an active material, and a solid electrolyte layer. The solid electrolyte layer includes a lithium-ion conductive sulfide containing at least one element selected from a group consisting of Al, Si, Fe, Ni, and Zr, the total content of the element in the lithium-ion conductive sulfide is 0.03% by mass or more and 0.3% by mass or less.

Abstract: A rechargeable battery including an electrode assembly including a first electrode and a second electrode; electrode terminals electrically coupled to the electrode assembly; a case in which the electrode assembly is placed; a cap plate in an opening of the case to seal the case, the cap plate including a vent hole; and a fluorescent coating between the cap plate and the opening of the case.

Abstract: Immobilization tapes include first immobilization tapes disposed across an electrode assembly upper edge, second immobilization tapes disposed across the electrode assembly lower edge, and third immobilization tapes disposed across the electrode assembly side edges. The first immobilization tapes are disposed on the outer sides of two protrusion positions from a positive electrode tab and a negative electrode tab within the electrode assembly upper edge. One pair or more each of the first, second and third immobilization tapes are disposed over the electrode assembly. In the length direction of the electrode assembly upper edge, each of the first, second and third immobilization tape pairs is disposed symmetrically, centered around a central line extending in the top-down direction from the midpoint of the electrode assembly upper edge.

Abstract: Provided is a method of manufacturing a secondary battery, in which scattering of an electrolyte is prevented while a degassing process is performed to prevent a product from being contaminated due to the scattering of the electrolyte. The method of manufacturing the secondary battery includes performing a formation process on a battery cell including a dead space to generate a gas within the battery cell, closing a piercing tool of a gas removing device to form a through hole in the dead space, thereby discharging the gas within the battery cell through the piercing tool, closing a sealing tool of the gas removing device after the gas is discharged to thermally bond an inner portion of the dead space that is adjacent to an electrode assembly within the battery cell, opening the piercing tool in the state where the sealing tool is closed, and opening the sealing tool after the piercing tool is opened.

Abstract: A connecting pole for a rechargeable battery is disclosed. The connecting pole (1) has a connecting section (2) in which a pole terminal can be attached to the connecting pole (1). The connecting pole (1) has an attachment section (3) in which the connecting pole (1) can be attached in a housing part (5) of the battery. The attachment section (3) has a labyrinth section (4). The outer wall (6) of the connecting pole (1) has at least one circumferential projection (7, 8) in the labyrinth section (4). The circumference of outer wall (6) of the connecting pole (1) increases in the direction pointing away from the connecting section (2) in a section of the labyrinth section (4) which is not provided with a circumferential projection (7, 8). Also disclosed is a rechargeable battery housing or a part of said rechargeable battery housing having at least one connecting pole.

Abstract: A fuel cell vehicle which a fuel cell stack is mounted on comprises a stack case that is configured to place the fuel cell stack therein; mounts that are configured to fix the stack case to a vehicle body; ribs, each being provided to be extended from a position adjacent to the mount across an upper surface of the stack case; and a damping member that is provided between adjacent ribs on the upper surface of the stack case. The damping member is a material formed by applying an aluminum sheet on butyl rubber. This configuration reduces the noise and damps the vibration.

Abstract: An electrode assembly and a secondary battery having the same are disclosed. In one embodiment, the electrode assembly includes a separator interposed between first and second electrode plates and a first electrode tab electrically connected to the first electrode plate; a second electrode tab electrically connected to the second electrode plate. The electrode assembly may further include an auxiliary tab electrically connected to at least one of the first and second electrode plates, wherein the auxiliary tab is positioned between the first and second electrode tabs.

Abstract: A rechargeable battery includes: an electrode assembly including first electrodes; separators; and second electrodes, wherein the first electrodes, separators, and second electrodes are laminated together and are fixed by a fixing portion at one side; a case, which is flexible, accommodating the electrode assembly, and pressure-adjusted after sealing; a marginal region between a free end of the electrode assembly and an inside surface of the case; and a spacing portion at the marginal region midway along the case, the spacing portion having a space that is narrower than a case thickness, the spacing portion accommodating changes in a length of the free end of the electrode assembly.

Abstract: A direct welding process for joining a current collector to a terminal pin in the construction of electrochemical cells is described. The resistance welding process utilizes increased current combined with an applied force to bond dissimilar metals with a melting temperature differential of preferably more than 500° C. Preferably, the method is used to bond the terminal pin to the cathode current collector. This method of attachment is suitable for either primary or secondary cells, particularly those powering implantable biomedical devices.

Abstract: An electric storage device includes an electrode assembly, a case housing the electrode assembly, a plastic member arranged at an outer surface of the case and including a joining surface facing the outer surface of the case, an external terminal supported by the plastic member and electrically connected to the electrode assembly, a sealing member arranged at the outer surface of the case, the sealing member including a joining surface facing the outer surface of the case, and an auxiliary terminal supported by the sealing member, the auxiliary terminal extending from inside to outside the case, being electrically connected to the electrode assembly, and being electrically connected to the external terminal. The plastic member includes a material having a hardness greater than a hardness of the sealing member.

Abstract: Provided is a technique for suppressing welding faults caused in sealing a case of a sealed battery by laser welding. A step for manufacturing a sealed battery having a case sealed by a sealing plug and a sealing plate, which includes a sealing step for fitting the sealing plug into a pouring hole formed in a recess of a lid portion and inserting the sealing plate into the recess, and a welding step for joining the sealing plate to the recess by laser welding. In the sealing step, a heat-insulating member is provided in a minute space defined by the recess, the sealing plug and the sealing plate so as to block at least a part of the boundary portion between the sealing plate and the recess. In the welding step, welding is completed at a position where the heat-insulating member is present in the boundary portion.

Abstract: A battery module is provided. The battery module includes a plurality of battery cell assemblies configured to electrically communicate with each other. Each battery cell assembly has an electrode stack enclosed by a case. The electrode stack is positioned in the case to form one or more peripheral spaces between the electrode stack and the case. Support members are positioned adjacent to each of the battery cell assemblies to contact a desired portion of the electrode stack. The support members are configured to focus a compressive force on a desired portion of the electrode stack. The compressive force urges gases formed during operation of the electrode stack into the peripheral spaces within the case.

Abstract: An oxidant gas conduit communicating with both an oxidant gas inlet communication hole and an oxidant gas outlet communication hole is formed in a surface of a cathode-side metallic separator which forms a fuel cell. Continuous linear guide ridges which protrude from intermediate height sections to the oxidant gas conduit side and form continuous guide conduits are provided on the cathode-side metallic separator. The linear guide ridges are continuously connected to ends of rectilinear conduit ridges which form rectilinear conduits, are provided with bend portions, and are set to lengths which are different from each other in a step-like manner.

Abstract: A battery pack includes a plurality of bare cells electrically connected to one another and a housing that accommodates the bare cells therein. The housing includes a frame portion and a pair of side portions respectively connected to one end and the other end of the frame portion. The housing includes a guide portion to guide a flow of fluid, the guide portion being located where the one end of the frame portion and one side portion of the pair of side portions are adjacent to each other.

Abstract: A manufacturing method for a square battery includes: a first process in which an outer terminal and an outer side resin member that separates the outer terminal and an outer surface of a lid body are assembled to the lid body; a second process in which a laser beam is irradiated from the outer surface side of the lid body to weld the lid body to the case body by laser after the first process; and a third process in which the outer side resin member is expanded after the second process.

Abstract: The invention provides a plate-integrated gasket which can reduce a width necessary for installing seal members provided in a plurality of plates which are laminated on each other, and can achieve an improvement of productivity. In order to achieve this purpose, in the plate-integrated gasket, one plate and the other plate are laminated on each other, an outer peripheral surface of the one plate is fitted or loosely fitted to a stepped surface which is formed in the other plate, and a seal member made of an elastic material having a rubber-like elasticity is integrally formed astride both of the one plate and the other plate, and has a fixed portion filled in a seal fixing groove which is formed between the one plate and the other plate.