73 results about "Flat joint" patented technology

The invention discloses an anti-leakage masonry wall, and aims to solve the problem that a straight-line-shaped flat joint of a traditional masonry wall is prone to leakage. The wall comprises a wall body built by building blocks, the wall body comprises a vertical section and a horizontal section, and a Z-shaped horizontal mortar joint is formed between the upper building block and the lower building block of the vertical section and is meshed through a tongue-and-groove structure; and vertical mortar joints are formed between adjacent building blocks in the horizontal section and are staggered up and down. A plain concrete bearing and blocking structure is further arranged, and a water baffle, a matched fixing edge, a limiting groove, a water swelling rubber strip, a limiting block and the like are arranged on the top of the building block. According to the structure, the water seepage path is prolonged, dynamic sealing is achieved, the masonry precision is guaranteed, the anti-seepage performance is cooperatively improved, and the building safety and durability are guaranteed.

The invention solves problems by providing a pre-manufactured molding corner piece made in an appropriate cross-section to match the molding or doorframe. The precut corners include a novel angled guide system that accurately positions molding strips in correct alignment with each precut corner and holds them there during installation. A “bevel guard” securely centers the molding strips during attachment and then is easily removed to accommodate final finish work. In use, molding is no longer required to be cut to form miter or bevel angles, but rather cut to a flat joint to match the distance in between two pre-manufactured corner pieces and engages the end of the preformed molding corner piece at a butt joint.

The invention discloses an underground diaphragm wall structure and a construction method thereof, and belongs to the technical field of underground diaphragm walls. The joint of the first-order reinforcement cage and the second-order reinforcement cage is improved, so that a formed construction joint between the first-order wall body and the second-order wall body is not a flat joint any more, but is a special-shaped joint formed by compounding multiple types of lines, the length of the joint is greatly prolonged, the moisture permeation difficulty is increased, and the waterproof effect is enhanced. Meanwhile, the first-order reinforcement cage and the second-order reinforcement cage are not in simple lap joint any more, but are combined in a lock catch connection mode and a plug pin connection mode, various stress modes such as pulling, twisting and bending can be borne, the connection strength is good, and stress transmission is continuous. In addition, the width of the reinforcement cage at the joint of the first-order reinforcement cage and the second-order reinforcement cage is not changed, and meanwhile, the structural strength of the joint is enhanced due to the addition of the first plate body, the second plate body and the steel pipe.

The invention discloses a circular cable harness with a flat joint reinforcing structure, and relates to the technical field of circular cables, the circular cable harness comprises a cable, a circular harness head and a connecting assembly, the connecting assembly is used for connecting the cable and the circular harness head, the connecting assembly comprises an upper shell and a lower shell, one side of the upper shell is hinged to one side of the lower shell, and the other side of the upper shell is hinged to the other side of the lower shell. The opposite sides of the upper shell and the lower shell are each provided with a first cable groove and a second cable groove, the cable and the first end of the circular wire harness head are clamped in the first cable groove and the second cable groove respectively, the upper shell and the lower shell in the first cable groove are opened in a mutually rotating mode, and the cable and the end of the circular wire harness head can be conveniently installed in the first cable groove and the second cable groove. The upper shell and the lower shell are closed through rotation inside, so that the upper shell and the lower shell can clamp and limit the cable and the circular wire harness head, the effect of fixing the positions of the cable and the circular wire harness head is achieved, extra stripping, measuring and other work on the outer skin are not needed, and the installation time is shortened.

The utility model discloses an airport concrete pavement dowel bar flat seam template which comprises fixing feet, a supporting frame body, a template body, a dowel bar and a dowel bar fixing piece, a bar piece bracket is welded to the rear side of a reserved through hole in the template, the pre-burying distance of the dowel bar is convenient to control, meanwhile, an easily-demoulded ring piece is arranged on the casting face side of the dowel bar, and the dowel bar fixing piece is fixed to the template body. The template at the dowel bar part can be easily removed, the damage of the concrete at the dowel bar part caused by the removal of the template is prevented, the overall quality of the concrete pavement is improved, and the dowel bar fixing part is arranged on the rear side of the template, so that the displacement of the rod piece caused by the influence of external factors such as mechanical equipment running and concrete vibration is prevented; the stability of the mounting position of the dowel bar in the concrete pouring period is ensured, the dowel bar is located at the position required by a design drawing from beginning to end, the dowel bar is stressed more uniformly in the runway operation period, and the anti-shearing force caused by resisting aircraft collision is enhanced.

The invention relates to a novel transition part for a wind turbine formed from a hollow cylindrical tubular section (1) having a plurality of connected rings (1a, 1b, 1c, 1d, 1e), the upper part of the transition part being a tower flange (11), the upper third comprising platforms (7, 8) and ribs (12), and the bottom part being a radial platform (9) having a bracket. The transition part further comprises three support columns (2), each support column comprising a support connector (4) and a corner connector (5), and six radial columns (3), the radial columns (3) being horizontal tubes narrower than the support columns (2). The support connector (4) is a component connecting the tubular section (1) by means of a female thread joint into the blind hole and connecting the upper portion of the support joint (2) by means of a circular joint. The corner connector (5) is a component having three joints: a first joint connected to the bottom portion of the support joint (2), a second joint connected to the ground or a module completing the lower truss tower, and a third joint connected to two radial joints (3) extending horizontally to the tubular section (1). And all the joints are circular joints. The X-shaped radial connector (6) is a cast iron part having two joints: a joint connecting the tubular section (1) by means of a flat joint and a joint connecting the two radial columns (3) by means of a circular joint.

The utility model relates to the technical field of chamfering tool, disclose double row chip chamfering tool, including handle, handle one end is provided with the body and the head, the head outer wall is provided with two row chip grooves of axis symmetry, the other end fixedly connected with flat joint of handle, the inside of flat joint is provided with connecting assembly, the inside of head is provided with protection assembly, connecting assembly includes hole slot and clamping block, the fixed ring is fixedly connected with the inner wall of screw cap, the inside of fixed ring is provided with the penetration of arc -shaped groove, the inside of screw cap is provided with connecting pipe, the inside of connecting pipe is provided with sliding slot, the outer wall of clamping block is connected in the inner wall of sliding slot with sliding. In the utility model, through rotating screw cap can drive inside clamping block along sliding slot and slide, make it and external equipment interface quick clamping or separate, easy operation, torsional spring provides stable reset force, ensure that self -locking is reliable in the process of connecting, avoid the loosening and falling off when processing, improve the clamping efficiency and security.

The present invention discloses an asymmetric T-shaped support system with few pivot points, including a T-shaped steel member and a parallel connection. The T-shaped steel member is the main load-bearing member of the support system, and is used to transfer the upper load to the lower support pile. The parallel connection is arranged above the T-shaped steel member, and the adjacent T-shaped steel members are connected to form a frame system. The steel column of the T-shaped steel member of the present invention can be reliably connected to the support pile, and is less constrained by the flatness of the ground and the bearing capacity of the foundation. The steel column and the crossbeam are integrally welded, and can be prefabricated in the factory, with good integrity, simple construction process, and short construction period. The adjacent T-shaped steel members are connected as a whole by the parallel connection, which improves the rigidity and stability of the system.

The utility model discloses a cement truck union adapter which comprises a union pipeline, a union female head is arranged on the right side of the union pipeline, a union male head is arranged on the left side of the union pipeline, a flush joint is arranged on the right side of the union pipeline, and a retaining shoulder is arranged on the right side of the surface of the union pipeline. And the union pipeline, the retaining shoulder and the flat joint are integrally cast and formed. The union pipeline, the female union head and the male union head are used in cooperation, two pipelines are in rapid butt joint, the female union head is prevented from sliding off in the installation process through the arrangement of the blocking shoulder, meanwhile, under the action of the limiting assembly, the female union head is prevented from loosening after being installed, the connecting mode of rapid disassembly and assembly is adopted, and the connecting effect is good. The two pipelines are in butt joint and communicated, meanwhile, the anti-retreating structure is arranged, the situation that the butt joint position of the pipelines is loosened due to long-term vibration of a vehicle is avoided, and the purposes of convenient installation and stable and reliable connection can be achieved.

The invention relates to the technical field of building structure engineering, in particular to a beam-column joint structure and a construction method thereof. The structure comprises a concrete column with reinforcing steel bars and a plurality of concrete beams connected to column joints. The concrete beam is composed of a precast beam and a beam post-pouring laminated layer on the upper portion of the precast beam, the end of the precast beam is provided with an arc-shaped beam end joint with a notch facing the column joint, and a connecting part is poured in the joint to form an integrated structure. Through the bionic occlusion design of the arc-shaped grooves in the precast beam ends and the cast-in-place connecting parts, the space conflict limitation of the multi-beam intersection joint steel bars is broken through, the flowing path of post-pouring concrete is optimized, and the pouring compactness of the joint area is remarkably improved. Beam end shearing force transmission is improved through the curved surface guiding characteristic of the arc-shaped joint, the stress concentration phenomenon of a traditional flat joint is eliminated, node shearing stress distribution is more uniform, and the protective layer stripping risk is reduced. The prefabricated beams are integrated with arc-shaped joints and connecting piece structures, self-compacting concrete is directly poured after on-site hoisting, and the workload of node formwork erecting and steel bar adjustment is greatly reduced.

A wine cabinet with a hinge provided with a limit includes a box body with a front opening and a door body. The door body includes a door frame and a door seal. The door frame includes a horizontal frame edge, a vertical frame edge, and a corner connecting member. The door body is hinged to the box body. A fixed cavity with a top opening, a front opening, and a side opening is provided at the front corner of the box body. The corner connecting member includes a right-angled body part, a horizontal joint, a vertical joint, a hinge notch, and a fixed shaft hole provided at the hinge notch. It also includes a hinge seat and a fixed shaft. The hinge seat is provided with a fixed shaft seat plate and a sliding block. The fixed shaft is fixed to the fixed shaft seat plate, and the sliding block is in contact with the fixed shaft. The horizontal joint is inserted into the cavity of the horizontal frame edge, and the vertical joint is inserted into the cavity of the vertical frame edge. The hinge seat is fixed to the fixed cavity, the fixed shaft rotates with the fixed shaft hole and is limited by a positioning device, and the sliding block is in sliding fit with the bottom plate of the hinge notch. The corner connecting member is provided with a fixed shaft hole, and the hinge seat is provided with a fixed shaft. The structure is simple, the assembly is convenient, and the automatic limit is achieved.

The invention relates to an assembly type wallboard butt joint connection structure, and mainly aims to solve the problems that traditional assembly type wallboard butt joint connection is difficult to adjust and low in precision, and joints are prone to water leakage. According to the main technical scheme, the method comprises the steps of butt joint of keels, wall surface leveling and butt joint of wallboards; the butt joint keel comprises a leaning face, a water blocking strip, a joint strip and a wallboard hook which are of an integrated structure, the joint strip protrudes out of the leaning face, the wallboard hook is arranged at the front end of the joint strip and connected with the leaning face through the joint strip, the wallboard hook and the leaning face are in an I shape, the water blocking strip is arranged on the leaning face and protrudes out of the leaning face, an adjusting edge protruding out of the back face is arranged on the back face of the end of the leaning face, and a wall face leveling device is fixed to the back face of the leaning face. The wall surface is leveled and fixed on the structural wall plate, a groove is arranged on the flush joint wall plate, and the groove is sleeved in the wall plate hook. According to the assembly type wall plate butt joint connection structure, the wall plate butt joint connection and adjustment become easier and more accurate when the assembly type wall plate butt joint connection structure is used for building wall plate connection, and joints are not prone to water leakage.

The utility model discloses a wall plate butt joint structure which is applied to bathroom building and comprises a first connecting piece, a second connecting piece, a first wall plate, a second wall plate and a mortise and tenon joint piece, one end of the first connecting piece is connected with the first wall plate, one end of the second connecting piece is connected with a second plate body, and the other end of the second connecting piece is connected with a third plate body. Mortise and tenon joint parts are arranged at the other ends of the first connecting piece and the second connecting piece, one end of the mortise and tenon joint piece is connected with the mortise and tenon joint part of the first connecting piece, and the other end of the mortise and tenon joint piece is connected with the mortise and tenon joint part of the second connecting piece. The connecting structure has the beneficial effects that the first connecting piece and the second connecting piece are both provided with the tenon-and-mortise parts, the first connecting piece and the second connecting piece are connected with the corresponding first wall plate and the second wall plate respectively, one end of the tenon-and-mortise part is inserted into the tenon-and-mortise part arranged on the first connecting piece, and then the other end of the tenon-and-mortise part is inserted into the tenon-and-mortise part arranged on the second connecting piece; by means of the design, the purpose of flush joint of the screw-free bathroom wall plates is achieved, the screw-free bathroom wall plates are not affected by the environment, the structure is simple, and the splicing purpose can be rapidly completed.

This product is intended to be used as a flat joint material to support the ends of eaves ceiling boards, as shown in the reference schematic diagram showing how it is used.

The utility model provides an assembly type steel structure building wallboard fireproof node structure which comprises a first node structure and a second node structure, the first node structure is used for being connected with a flat joint type seam of an enclosure wallboard, and the second node structure is used for being connected with a protruding type seam of an inner partition wallboard. And a fireproof sealing structure is arranged at the electromechanical opening of the inner partition wall board. The utility model has the beneficial effects that the fireproof performance of the whole building is improved, the aesthetic property, the practicability and the heat preservation property are ensured, the occupied space is smaller, the usable area is ensured, the fireproof weak points are reduced, the structure is simple, the operation is convenient and fast, the construction efficiency is improved, and the construction cost is reduced.

The application provides a flat tensile strength simulation analysis method and device of a flat joint, wherein the method comprises the following steps: intercepting part of the flat joint in a buckling state as an analysis model, and respectively modeling the inner tooth, outer tooth and base cloth of the analysis model; setting the contact parameters and material parameters of each part of the analysis model; setting the coordinate system of the analysis model; selecting the loading point and constraint point of the analysis model, adding corresponding constraints to the constraint point, and applying a flat tensile strength load to the loading point to perform simulation calculation; analyzing the simulation output result of the analysis model to determine the flat tensile strength load of the flat joint; measuring the inner tooth and outer tooth closest to the loading point or constraint point, intercepting a cross section at the middle position of the tooth width at the position, and taking the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth buckling area to determine whether the distance between the two is reduced from the initial value to 0; if so, the tensile constraint reaction force at this time is determined as the flat tensile strength load.

The invention belongs to the technical field of foundation pit engineering, and discloses a continuous open caisson sealing and water stopping connecting structure and a construction method.The continuous open caisson sealing and water stopping connecting structure comprises two sealing and water stopping connecting pieces, and each sealing and water stopping connecting piece comprises a groove; a bump; two notches; a reinforcement cage; and the post-pouring concrete body is formed after concrete is poured into the pouring cavity, the formed post-pouring concrete body wraps the steel reinforcement framework, and the post-pouring concrete body and the two adjacent open caissons are anchored into a whole. According to the method, the convex blocks and the grooves are matched for limiting, so that the convex blocks on the sunk well which sinks later can slide in the grooves of the sunk well which sinks first, the positioning effect is achieved, and compared with a flat joint, the connection of the convex blocks and the grooves can prolong the water seepage path, and the water seepage probability of the connecting joint of the two adjacent sunk wells is greatly reduced; the two adjacent open caissons are connected and anchored through the post-poured concrete body, connection is stable, the post-poured concrete body blocks the connecting seam of the protruding block and the groove, and water seepage is further prevented.

The invention relates to the technical field of hot dipping, in particular to continuous hot dipping equipment which comprises a rotating mechanism arranged in the middle of a platform, a clamping mechanism arranged on the rotating mechanism, and a feeding mechanism, a dipping mechanism and a discharging mechanism which are arranged on the platform in the circumferential direction. The clamping mechanism comprises a clamping jaw assembly arranged on the rotating mechanism and used for clamping a cross beam part of the workpiece, an outer supporting assembly arranged on the clamping jaw assembly and used for clamping two butt joint parts of the workpiece, and a covering and sealing assembly arranged on the clamping jaw assembly and used for covering the workpiece. A pure mechanical clamping mode is adopted, electric structure control is not needed, workpieces can be automatically clamped and released, a clamping mechanism cannot be contaminated by metal liquid, the service life is prolonged, continuous hot dipping work can be carried out, and the problems that a traditional electric clamp is prone to being contaminated by the metal liquid, electronic elements on the clamp are damaged, and the production efficiency is high are solved. And normal use of the clamp is influenced.

The application discloses a steel pipe pile underwater flat joint construction device and a construction method. The steel pipe pile underwater flat joint construction device comprises a float, a flat joint assembly and a locking piece. The float has a containing cavity for containing medium. The float is used in sliding fit with the steel pipe pile. The float has a first position and a second position. The float is switched between the first position and the second position. The first position is the position of the float when the float does not contain medium. The second position is the position of the float when the float contains medium with a preset volume. The flat joint assembly is connected to the float. The locking piece has a locking state and an unlocking state. When the locking piece is in the locking state, the locking piece is used for locking and connecting the float in the first position or / and the second position to the steel pipe pile. When the locking piece is in the unlocking state, the float is in sliding fit with the steel pipe pile. The construction difficulty of the underwater flat joint assembly is greatly reduced, large lifting equipment is not needed, and the increase of the steel cost is avoided.

The butt joint connection structure of the seamless plug-in type aluminum honeycomb wallboards comprises a plurality of aluminum honeycomb wallboards which are located on the same installation plane and connected in sequence and fixed connection pieces installed between the adjacent aluminum honeycomb wallboards. The two opposite sides of the aluminum honeycomb wallboard are provided with a concave block material and a convex block material which can be installed in an inserted mode, and a connecting piece installation cavity used for installing and fixing a connecting piece is reserved between the concave block material and the convex block material which are connected in an inserted mode. The concave block material is hung at the bottom of the fixed connecting piece; compared with the prior art, the concave block material and the convex block material on the two sides of the same aluminum honeycomb wallboard are hung, inserted and mounted in sequence through the fixed connecting pieces and the aluminum honeycomb wallboards, so that the aluminum honeycomb wallboards are hung through the fixed connecting pieces while the aluminum honeycomb wallboards are connected in sequence; the whole installation mode is convenient and reliable, and the structure is simple.

The present invention relates to a technology for manufacturing a system for ensuring the safety of a nuclear power plant. A method for manufacturing a cantilever truss for a core meltdown catch device, in which two symmetrical parts of the cantilever truss are formed, each part consisting of an outer, middle and inner half shell, which are connected by radial and parallel bearing ribs, upper and lower semicircular force plates by welding to form parallel and radial sectors. The two symmetrical parts are then connected to each other by welding at two parallel sector parts located on one orthogonal axis, such that an upper horizontal joint connects each upper semicircular force plate, a lower horizontal weld joint connects each lower semicircular force plate, and outer, inner and middle vertical weld joints connect each outer, inner and middle half shell. In this way, the reliability of the core meltdown catch device and the core cooling equipment is improved.

The utility model relates to the technical field of heat dissipation of new energy batteries, in particular to a horizontal joint which comprises a fixing seat, the fixing seat is arranged in a cooling groove of a heat dissipation plate, a mounting groove is formed in the position, located in the cooling groove of the heat dissipation plate, of the fixing seat, a fixing block is clamped in the mounting groove, and the fixing block penetrates through and extends out of the cooling groove of the heat dissipation plate. The fixing block is detachably connected with the machine body, one side of the fixing base is fixedly connected with a check block, the end, away from the fixing base, of the check block is fixedly connected with a connector pipeline, and the connector pipeline is parallel to the heat dissipation plate cooling groove. The situation that the flow speed and flow of cooling liquid are reduced when the cooling liquid passes through the bent position is avoided, the cooling liquid can flow out of the connector pipeline smoothly, the arranged fixing block is clamped with the mounting groove in the fixing base, the fixing base is convenient to mount and dismount, and therefore the connector pipeline is convenient to mount and dismount, and the connector pipeline is replaced more rapidly.

The present invention provides a prefabricated wall system and an installation method thereof. The prefabricated wall system includes wallboard components, inside corner components and outside corner components that can be arbitrarily connected to each other in pairs. A plurality of the wallboard components, inside corner components and outside corner components are provided. The wallboard component includes a main keel and a wallboard fixedly arranged on the main keel. The wallboard components are independent of each other, and adjacent two wallboard components are positioned and connected through a flat joint. The present invention first assembles the components, and then assembles the components. The components are leveled through the flat joint so that the wallboards are on the same reference plane to improve the flatness of the wallboards after assembly.

The utility model discloses a middle-low foaming multiple switchable foam hook pipe device which comprises an inlet pipe weldment, a foam outlet pipe assembly and a switching valve assembly, and the inlet pipe weldment and the foam outlet pipe assembly form a coaxial different-hole structure through the switching valve assembly. The fire-fighting quick-insertion internal thread connector is positioned at the upper end of the inlet pipe weldment; the hook pipe weldment is connected with the foam outlet pipe assembly to form a hook-shaped structure, and the tail end of the hook pipe weldment is fixed with the tail section of the hook pipe through a butterfly bolt; the switching valve assembly comprises a valve shell, a valve plate, a valve gland, a valve handle, an internal thread ball valve and a quick-assembly external thread flat connector, the valve plate is located in a cavity formed by the valve gland and the valve shell, and a plurality of inner through holes and a plurality of outer through holes are formed in the valve plate. According to the utility model, the foam suction area is increased, and a secondary impact pore plate structure with coaxial different holes is designed by utilizing a foam impact secondary foaming principle, so that the problems of low foaming times, unstable foaming and incapability of adjusting the foaming times when a foam hook pipe is used for fire extinguishing of a fire dike oil pool are solved.

The utility model relates to the technical field of three -way joint, specifically disclose a wear -resisting three -way joint, including three -way joint, two horizontal joint's bottom is provided with wear -resisting structure, wear -resisting structure includes integrated mounting panel and wear plate, is set up on wear plate multiple wear -resisting recess, integrated on wear plate multiple wear -resisting convex, multiple wear -resisting recess and multiple wear -resisting convex interval arrangement, through setting wear -resisting structure in the vertical joint's right below, can reduce the impact of water flow buffering and the long -term wear and tear of water flow to the inner wall bottom end of horizontal joint, specifically when water flow flows down from the vertical joint, water flow and multiple wear -resisting recess and multiple wear -resisting convex on wear plate contact, and then through multiple wear -resisting recess and multiple wear -resisting convex can disperse water flow, slow down the impact of water flow, avoid the water that flows down from the vertical joint directly with the inner bottom end of horizontal joint contact to realize the effect of wear -resisting protection to three -way joint.

This invention relates to the field of hot-dip plating technology, specifically to a continuous hot-dip plating equipment. It includes a rotating mechanism positioned in the middle of a platform, a clamping mechanism mounted on the rotating mechanism, and a loading mechanism, a plating mechanism, and a unloading mechanism mounted on the platform along the circumferential direction. The clamping mechanism includes a jaw assembly on the rotating mechanism for clamping workpieces, an outer support assembly on the jaw assembly for clamping workpieces at two flat joints, and a cover assembly on the jaw assembly for covering the workpieces. This invention employs a purely mechanical clamping method, requiring no electrical control structure, and can automatically clamp and release workpieces. The clamping mechanism does not come into contact with molten metal, thus improving its service life. It can perform continuous hot-dip plating operations, solving the technical problem that traditional electrical clamps are easily contaminated with molten metal, leading to damage to electronic components and affecting the normal use of the clamps.

To provide a drive recorder capable of reducing working cost and weight regardless of a configuration in which an angle of a camera body is freely adjusted.SOLUTION: A drive recorder 1 includes: a vehicle joining part 20 in which a joining member 22 joined to a vehicle is attached to a vehicle attachment surface 21a and a flat joining member 23 is attached to a support surface 21b; and a camera body 100 which incorporates an imaging element. A spherical surface joining member 32 is pressed to the flat joining member 23, after an angle of the camera body 100 is adjusted, to maintain an attitude of the camera body 100.SELECTED DRAWING: Figure 1

A double-layer cast busbar T-joint structure includes a double-layer cast busbar, each layer of the double-layer cast busbar is connected to a cast busbar horizontal T-joint below, the other end of the cast busbar horizontal T-joint is connected to the cast busbar vertical elbow, the other end of the cast busbar vertical elbow is connected to a pan head connection device, and the pan head connection device is used for the electrical connection between the double-layer cast busbar and the excitation transformer. The cast busbar horizontal T-joint means that the two interfaces of the joint are in a horizontal state; the cast busbar vertical elbow means that the two interfaces of the joint are in a vertical state. The beneficial effects of the utility model are: it has the following advantages: the device is simple and easy to use, saves materials, and is safe and reliable.

The invention provides a capacitor and a method for manufacturing the capacitor. The capacitor includes a capacitor element, a bus bar, and an exterior body. The bus bar includes a flat-plate-shaped joining terminal portion that is exposed from the exterior body and to which the external terminal is joined. A partial region of the surface of the joint terminal portion is set as a joint portion to be welded when the external terminal is joined. The surface of the joint terminal part is provided with an indicating part indicating the area of the joint part.