JP4235168B2 - Bonding structure and bonding method of bus bar for electronic device and connection terminal - Google Patents

Description

The present invention relates to a bonding structure between a bus bar for an electronic device and a connection terminal, and a method for bonding the connection terminal to the bus bar for an electronic device. The present invention also relates to a method of joining a connection terminal to the bus bar for electronic equipment.

  In recent years, the advancement of electronics has been remarkable. For example, in the case of car electronics, the number of electronic devices and CPUs mounted in automobiles has increased dramatically. For this reason, when the automobile wire harness is branched and connected to various electrical components, an electrical connection box (junction block) is employed in order to concentrate the branch connection portions and perform wiring rationally and economically. .

  Conventionally, a desired connection is made by joining connection terminals (tab terminals) of electronic components that are separately manufactured to bus bars that are stamped into various shapes by pressing or the like and have various circuit patterns formed thereon. There is known an electric junction box that is configured to be smaller and higher in density by configuring the above circuit.

  In such an electrical junction box, if soldering is used when joining the bus bar and the connection terminal, cracks may occur in the joint and the mechanical strength may be reduced. A technique of welding using a heat source having a high energy density is known. However, the material of the bus bar is copper or a copper alloy, and its thermal conductivity is high. For this reason, for example, laser welding requires high-power laser irradiation, which may lead to problems such as an increase in equipment costs and a decrease in welding quality due to a large amount of spatter.

  Therefore, while providing a rod-shaped protrusion having a small cross-sectional area on the connection terminal, a through hole is formed in the bus bar through which the rod-shaped protrusion can be inserted, and the rod-shaped protrusion of the rod-shaped protrusion is inserted in the through hole. A technique is known in which a bus bar and a connection terminal are joined by irradiating a laser beam toward the distal end portion to melt the distal end portion of the rod-shaped protrusion (see, for example, Patent Document 1).

  According to this technique, since the laser beam is irradiated to the low heat capacity shaped rod-shaped protrusion provided on the connection terminal, even if the material is copper or copper alloy having high thermal conductivity, the melting point or more is exceeded. Can be easily heated to melt the tip of the rod-like protrusion, so that welding by low-power laser irradiation becomes possible.

  Also, using a burring process, a burring portion protruding in a tapered cylindrical shape with the through hole as a central hole is provided, and a bar-like protrusion portion of a connection terminal is inserted into the through-hole to burring the tip end portion of the rod-like protrusion portion. There is also known a technique for joining the bus bar and the connection terminal by irradiating the tip of the rod-like projection with laser light in a state of protruding from the protruding tip of the part to melt the tip. For example, see Patent Document 2).

According to this technique, the burring portion protruding in a tapered cylindrical shape serves as a guide when the rod-shaped protrusion of the connection terminal is inserted into the through hole of the bus bar, so that the insertion operation can be performed smoothly and easily. .
JP 2002-25639 A Japanese Patent Laid-Open No. 7-241020

  However, in the above-described prior art, it is necessary to separately provide a bar-shaped protrusion only for joining to the burring portion on the connection terminal, which causes a problem that the number of processes is increased and the cost is increased.

  On the other hand, when the connecting rod-shaped protrusions are not provided on the connection terminals, there are the following problems. That is, since the diameter and material of the connection terminal are different depending on the type of electronic component to be joined to the bus bar, the heat input conditions for the connection terminal are also greatly different for each terminal. For this reason, in the technique of joining the burring portion and the connection terminal by heating and melting the connection terminal as in the above-described conventional technique, the joining method must be changed for each connection terminal of each electronic component as shown below. Don't be. Therefore, it is necessary to prepare different welding machines for each joining method, resulting in high cost of electronic equipment and complicated manufacturing processes.

  For example, when the connection terminal is made of a copper-based material, the copper-based material has a high thermal conductivity and a high reflectance of the laser beam, so that the copper-based connection terminal having a particularly large wire diameter will be melted by irradiation with the laser beam. If so, a considerable amount of power is required and the efficiency becomes extremely low. Moreover, even if it is going to join a copper-type connection terminal to a bus bar which consists of copper-type materials by resistance welding, since the difference of the resistance value between both members is small, it cannot join favorably. For this reason, copper-based connecting terminals having a wire diameter of φ2 mm or more are joined to a bus bar made of a copper-based material by plasma welding, and copper-based connecting terminals having a wire diameter of less than φ2 mm are joined by TIG welding. On the other hand, when the connection terminal is made of an iron-based material, when the wire diameter is 2 mm or more, laser welding or plasma welding is performed (if the wire diameter is 2 mm or more, it becomes difficult to generate Joule heat by resistance welding. ), If the wire diameter is less than 2 mm, it was joined to a bus bar made of a copper-based material by resistance welding.

  On the other hand, for an electronic device including a bus bar to which a connection terminal of an electronic component is bonded, for example, when performing a vibration test, the bonding strength at the bonding portion between the connection terminal and the bus bar is higher than the base material strength of the connection terminal. Needed. For this reason, if the wire diameter of the connection terminal is increased, the bonding strength between the connection terminal and the bus bar is required to be higher than the bonding strength between the connection terminal having a thin wire diameter and the bus bar. Therefore, it is necessary to employ a welding method that can secure high joint strength for joining the connection terminal having a large wire diameter and the bus bar.

  Furthermore, in the above prior art, in the state where the tip of the rod-like projection inserted through the through-hole of the burring portion or the like is protruded from the through-hole, the laser beam is irradiated toward the tip of the rod-like projection. The tip of the rod-shaped protrusion was melted. For this reason, when setting the connection terminal on the bus bar, if the amount of protrusion of the tip portion is not managed with high accuracy, there is a problem in that bonding failure occurs.

  That is, for example, if the tip of the rod-like protrusion is set in a state where the amount of protrusion that protrudes from the protruding tip of the burring portion is insufficient, the amount of molten metal that contributes to welding due to heating and melting of the tip is insufficient. This results in poor bonding. Also, if the tip of the connection terminal is set in the through hole without jumping out from the protruding tip of the burring part, the connection terminal will not be melted by laser light irradiation, or the burring part may Even when heated and melted by irradiation with light, the contact area between the molten metal and the connection terminal is insufficient, so that joint failure occurs in the same manner.

  Therefore, in the above prior art, in order to obtain a good joined state, it is necessary to manage the protruding amount of the tip portion with high accuracy when setting the connection terminal on the bus bar, and the setting process work is troublesome. There was a problem that there was.

  In addition, if the rod-shaped protrusions of the connection terminals are made of an iron-based material, the low-boiling additive components and impurities contained in the iron-based material will boil when the rod-shaped protrusions are heated and melted by laser light irradiation. As a result, there is a problem that a large amount of spatter is generated.

The present invention has been made in view of the above circumstances, and even when a connection terminal having a different material or wire diameter is welded to the bus bar, a bar-like protrusion or the like only for joining is separately provided on the connection terminal. Without having to change the welding method (welding machine) for each connection terminal, the connection structure of the bus bar for electronic equipment and the connection terminal and the connection terminal to the bus bar for electronic equipment can be well welded. It is a first object to provide a bonding method.

Further, the present invention may set the connection terminals easily while accurately perform positioning in the height direction relative to the bus bar, well bonded structure and an electronic welding busbar electronics which may be a connecting terminal It is a second object to provide a method for joining a connection terminal to a bus bar for equipment.

Furthermore, the present invention provides a bonding structure of an electronic device bus bar and a connection terminal capable of effectively suppressing the occurrence of spatter even when welding a connection terminal made of an iron-based material, and an electronic device bus bar. It is a third object to provide a method for joining connection terminals.

Joint structure connected to claim 1 electronic device busbar according pin main body and the projecting distal end with projecting tubular shape raised integrally from the body portion to have an insertion hole made of copper-based material And a cylindrical protrusion having a tip side melted portion, and the tip side melted portion is melted by a high energy density heating source in a state where the connection terminal is inserted into the insertion hole. A connection structure of a bus bar for an electronic device and a connection terminal to which the protrusion and the connection terminal are welded, wherein the cylindrical protrusion is spaced in the circumferential direction along the protrusion direction of the cylindrical protrusion. Each of the divided bodies is provided integrally with the tip-side melted portion that is melted by the heating source and the tip-side melted portion, and is connected to the connection. By inserting the terminal into the insertion hole Through the elastic force generated by the divided body is elastically deformed in the centrifugal direction, inserted into the insertion hole even in a state where the connecting terminals possible and the tip-side molten bond holding the inserted into said insertion hole is melted Each of them has a base end side holding portion capable of holding the connecting terminal.
Here, the front end side melted portion refers to a portion on the projecting front end side of the cylindrical projection, which is heated and melted by a high energy density heating source to become a molten metal.

In the joining structure of the bus bar for an electronic device and the connection terminal, the molten portion in which the tip side molten portion of the cylindrical protrusion is heated and melted preferentially by a high energy density heating source is melted. It is buried and solidified in the gap between the cylindrical projection and the connection terminal inserted into the insertion hole. (If the connection terminal is a different material with a melting point higher than that of the bus bar, By being brazed with a copper-based metal, the cylindrical projection and the connection terminal are joined. That is, the molten metal obtained by heating and melting the tip-side molten portion of the cylindrical projection portion mainly contributes to welding of the cylindrical projection portion and the connection terminal . Here, the larger the amount of melting (the amount of molten metal) of the cylindrical protrusion heated and melted by the heat source, the larger the joining area and the higher the joining strength at the joining portion. Therefore, if the protrusion height of the cylindrical protrusion is adjusted in advance according to the material and wire diameter of the connection terminal to be joined and the length of the distal end side melted part is adjusted appropriately, the distal end side will remain. By reliably heating and melting the melted portion, it is possible to secure a suitable joint area according to the connection terminal joined to the cylindrical projection and obtain a desired joint strength. Therefore, a high energy density heating source capable of reliably heating and melting the tip side melted portion of the cylindrical projection without adopting different welding methods (welders) depending on the connection terminals to be joined. Only by adopting a single welding method (welding machine) to be used, the cylindrical projection and the connection terminal can be satisfactorily joined.

Moreover, since each cylindrical projection part and each connection terminal can be favorably joined by heating and melting each tip side melting part of each cylindrical projection part , the joining property is ensured on the joining terminal side. additionally necessary to provide the conventional bar-like projections or the like for is not Na. Therefore, it is possible to avoid an increase in the number of processes and an increase in cost due to the provision of the bar-shaped protrusions separately on the connection terminals .

Further, when the connection terminal is inserted into the insertion hole of the cylindrical protrusion, each divided body is elastically deformed in the centrifugal direction along with the insertion of the connection terminal, thereby generating an elastic force, and the connection inserted into the insertion hole. A terminal is hold | maintained in each base end type | mold holding | maintenance part via this elastic force, and the further insertion of a connection terminal is controlled by this. That is, the connection terminal inserted into the insertion hole is held by each proximal end holding portion through the elastic force of each divided body constituting the cylindrical projection, thereby making the height of the connection terminal with respect to the cylindrical projection Positioning in the direction is performed accurately. In addition, since the connection terminal is held by the base end side holding portion of each divided body through the elastic force in this way, the connection terminal is accurately positioned in the lateral direction with respect to the cylindrical protrusion. Therefore, the electronic device can be obtained by an extremely simple method of simply inserting the connection terminal into the insertion hole of the cylindrical projection and performing the insertion operation until the connection terminal is held by each proximal end holding portion of each divided body. It is possible to easily set the connection terminal while accurately positioning in the height direction and the lateral direction with respect to the cylindrical protrusion of the bus bar.

  If the connection terminal is set by being accurately positioned in the height direction with respect to the cylindrical protrusion, the relative positional relationship in the height direction between the cylindrical protrusion and the connection terminal is stabilized. For this reason, the molten metal which contributes to welding by heating and melting the tip side melt portion of the cylindrical projection is stably supplied to the gap between the cylindrical projection and the connection terminal. Therefore, the amount of molten metal contributing to welding is not insufficient, or the contact area between the molten metal and the connection terminal is not insufficient, and the cylindrical protrusion and the connection terminal are connected through the solidification of the molten metal. It becomes possible to weld well.

  Further, if the connection terminal is set by being accurately positioned in the lateral direction with respect to the cylindrical protrusion, the relative positional relationship in the horizontal direction between the cylindrical protrusion and the connection terminal is stabilized. For this reason, the connection terminal is not set in a state of being biased with respect to the center of the insertion hole of the cylindrical protrusion. Therefore, since the molten metal is supplied evenly in the circumferential direction to the gap between the cylindrical projection and the connection terminal, the cylindrical projection and the connection terminal should be welded equally well in the circumferential direction. Is possible.

Furthermore, each proximal end holding portion of each divided body constituting the cylindrical protrusion can hold the connection terminal inserted into the insertion hole even when each distal end melting portion is melted. The cylindrical projection and the connection terminal can be welded while being accurately positioned in the height direction and the lateral direction with respect to the projection, and better welding is possible.

Further, when the connection terminal is inserted into the insertion hole of the cylindrical protrusion, each divided body is elastically deformed in the centrifugal direction, so that the insertion operation is facilitated. And if each divided body is elastically deformed in the centrifugal direction with the insertion of the connection terminal into the insertion hole, it can be confirmed with a camera, vision or sensor, etc., so the elasticity of each divided body in the centrifugal direction can be confirmed. The insertion state of the connection terminal into the insertion hole can be surely grasped by the deformation amount. For this reason, when heating and melting the tip side melting portion with a heating source, it is possible to set the heating condition according to the insertion state of the connection terminal. Therefore, the amount of molten metal that contributes to welding can be reliably ensured, and the cylindrical projection and the connection terminal can be more favorably welded. In addition, since it can be confirmed in advance that the connection terminal is not normally inserted into the insertion hole, it is possible to prevent the occurrence of poor bonding by re-setting the connection terminal. . In the state where the connection terminal is inserted into the insertion hole, a gap is formed between the protruding tips of the respective divided bodies, and therefore the insertion state of the connection terminal into the insertion hole may be confirmed through this gap. .

The joint structure according to claim 2 connected to the electronic equipment busbar according terminals, in the bonding structure of the connection between claim 1 electronic device busbar according terminals, each of said divided body, so as to close a portion of the insertion hole Each of the divided members has a flange portion that is integrally extended in the centripetal direction from the projecting tip of the divided body and constitutes a part of the tip side melted portion.

In the joining structure of the bus bar for electronic equipment and the connection terminal, the opening of the insertion hole on the projecting tip side of the cylindrical projection is formed by the flanges integrally extending from the projecting tip of each divided body in the centripetal direction. Partially occluded. For this reason, the connection terminal inserted into the insertion hole of the cylindrical projection is restricted from being further inserted when the distal end surface abuts on each flange. That is, when the distal end surface of the connection terminal is in contact with each flange portion of each divided body, the connection terminal is accurately positioned in the height direction with respect to the cylindrical protrusion. Therefore, the electronic device is simply inserted by inserting the connection terminal into the insertion hole of the cylindrical protrusion and performing the insertion work until the tip end surface of the connection terminal comes into contact with each flange of each divided body. It is possible to easily set the connection terminal while accurately positioning the bus bar in the height direction with respect to the cylindrical protrusion. Therefore, it is possible to favorably weld the cylindrical protrusion and the connection terminal.

  In addition, since each flange portion of each divided body partially closes the insertion hole, it is inserted into the insertion hole when the tip side melted portion of the cylindrical projection is heated and melted by the heating source. The flange portion restricts that the connection terminal is directly heated by the heating source. For this reason, even when the connection terminal is made of an iron-based material, the occurrence of spatter can be effectively suppressed.

The method of joining a connection terminal to a bus bar for electronic equipment according to claim 3 includes: a main body portion made of a copper-based material; and a protrusion protruding from the main body portion so as to have an insertion hole; A cylindrical projection having a tip-side melted portion on the side, and the tip-side melted portion is melted by a high energy density heating source in a state where the connection terminal is inserted into the insertion hole. A connecting terminal to a bus bar for electronic equipment in which the protruding portion and the connecting terminal are welded , wherein the cylindrical protruding portion is spaced in the circumferential direction in the protruding direction of the cylindrical protruding portion. Each of the divided bodies is provided integrally with the tip-side melted portion melted by the heating source and the tip-side melted portion. respectively a proximal-side holding portion has, Through the elastic force generated by causing by inserting the connection terminals into the insertion hole of the serial tubular projecting portion of each of the divided bodies are respectively elastically in the centrifugal direction deformation, each said connection terminal is inserted into said insertion hole A setting step of holding the distal end side of the connection terminal in the vicinity of the distal end side melted portion of each divided body while holding the proximal end side holding portion, and dividing the laser beam as the heating source into each of the divided portions by irradiating toward each said front-end-side molten bond of the body, the while held via the elastic force of the connection terminal to each of said base end side holding portion of each of the divided body, each distal-end-side molten bond It comprises a joining step for melting and joining the cylindrical projection and the connection terminal.

In this method of joining the connection terminal to the bus bar for electronic equipment, the tip side melted portion of the cylindrical projection is heated and melted preferentially over the connection terminal by using laser light as a high energy density heating source. In the setting step of this joining method, the connection terminal inserted into the insertion hole is held by the proximal end holding portion of the cylindrical projection, and the distal end surface of the connection terminal is in the vicinity of the distal end fusion portion of the cylindrical projection To be located. And a laser beam is irradiated toward the front end side fusion | melting part of a cylindrical projection part at a joining process. If the tip side melted part is heated and melted by laser light irradiation, the molten metal melted by the tip side melted part is buried in the gap between the cylindrical protrusion and the connection terminal inserted in the insertion hole, When it solidifies, each cylindrical projection and each connection terminal are joined. Therefore, without employing different welding methods in accordance with the connection terminals to be joined (welder), the laser light is capable of irradiation conditions be surely heated and melted front-end-side molten bond of the cylindrical protrusion portion Only by adopting laser welding that irradiates each of the tip-side melted portions, it becomes possible to satisfactorily join the cylindrical protrusion and the connection terminal.

Further, in this method of joining the connection terminal to the bus bar for electronic equipment, an elastic force is generated by elastically deforming each divided body in the centrifugal direction as the connection terminal is inserted into the insertion hole in the setting step. The connection terminals inserted into the insertion holes are held by the base end type holding portions through this elastic force. Thereby, further insertion of the connection terminal is restricted, and the connection terminal is accurately positioned in the height direction and the lateral direction with respect to the cylindrical protrusion. Therefore, by simply inserting the connection terminal into the insertion hole and holding the insertion terminal on each proximal end holding portion of each divided body, the height direction and The connecting terminals can be easily set while accurately positioning in the lateral direction. In the joining process, the molten metal that contributes to welding by heating and melting the tip side molten portion of the cylindrical projection is positioned in the height direction and the lateral direction with respect to the cylindrical projection and the cylindrical projection. Since it can be stably supplied to the gap between the connected terminal and the like, the amount of molten metal contributing to welding may be insufficient, or the contact area between the molten metal and the connecting terminal may be insufficient. In addition, the cylindrical protrusion and the connection terminal can be favorably welded through solidification of the molten metal .

In addition, when the connection terminal is inserted into the insertion hole of the cylindrical protrusion in the setting step, each divided body is elastically deformed in the centrifugal direction, so that the insertion operation is facilitated. And in the confirmation process, the elastic deformation in the centrifugal direction of each divided body accompanying the insertion of the connection terminal into the insertion hole can be confirmed with a camera, vision or sensor, etc., so that the connection terminal is inserted into the insertion hole. Can be reliably grasped. For this reason, it is possible to set the heating condition according to the insertion state of the connection terminal when the tip side melted portion is heated and melted by the heating source in the joining step . Therefore , the amount of molten metal that contributes to welding can be reliably ensured, and the cylindrical projection and the connection terminal can be more favorably welded. In addition, since it is possible to confirm in advance the insertion abnormality of the connection terminal in the confirmation step, it is possible to prevent the occurrence of poor bonding by re-setting the connection terminal.

  Further, in the joining step, each of the distal ends is accurately positioned in the height direction and the lateral direction with respect to the cylindrical protrusion by securely holding the connection terminal at each proximal end holding portion. Since the side melting portion can be heated and melted, better welding is possible.

A method for joining a connection terminal to a bus bar for electronic equipment according to claim 4 is a method for joining a connection terminal to a bus bar for electronic equipment according to claim 3 , wherein each of the divided bodies is one of the insertion holes. Each of which has a flange portion integrally extending in the centripetal direction from the projecting tip of the divided body so as to close the portion, and constituting a part of the tip-side melted portion. The front end surface of each of the divided members is brought into contact with each flange portion of each of the divided bodies.

  In this method of joining the connection terminal to the bus bar for electronic equipment, the connecting terminal is brought into contact with each flange portion of each divided body in the setting process, so that the connection terminal is simply moved until the tip surface comes into contact with the flange portion. The connection terminal can be set by a very simple method of inserting into the insertion hole.

  Further, in this joining method, when the tip side melted portion of the cylindrical projection is heated and melted by the heating source in the joining process, the connection terminal inserted in the insertion hole is directly heated by the heating source. Therefore, even when the connection terminal is made of an iron-based material, the generation of spatter can be effectively suppressed.

The method for joining the connection terminal to the bus bar for electronic equipment according to claim 5 is the method for joining the connection terminal to the bus bar for electronic equipment according to claim 3 or 4 , in the joining step, wherein The laser beam is irradiated perpendicularly along the protruding direction of the cylindrical projection toward the distal end side melted portion.

  In this method of joining the connection terminal to the bus bar for electronic equipment, the laser beam is irradiated vertically along the protruding direction of the cylindrical projection in the joining process, so that the laser beam is stably and efficiently applied. The tip side melting portion can be heated and melted. Even if spatter is generated from the connection terminal, the spatter can be evaporated by the heat of the laser beam irradiated vertically.

Therefore, according to the joining structure of the bus bar for electronic equipment and the connection terminal and the joining method of the connection terminal to the bus bar for electronic equipment according to the present invention, the connection terminal having a different material and wire diameter is welded to the bus bar. However, the cylindrical protrusion and the connection terminal are well welded without separately providing a rod-shaped protrusion or the like only for joining on the connection terminal, and without changing the welding method or welding machine for each connection terminal. It becomes possible.

  In addition, since the connection terminal can be easily set while accurately positioning the bus bar in the height direction, the cylindrical protrusion and the connection terminal can be favorably welded.

Furthermore, when the cylindrical protrusion has a flange portion or when the laser beam is vertically irradiated, the generation of spatter from the connection terminal made of an iron-based material can be effectively suppressed.

The bus bar for electronic equipment according to the joint structure of the bus bar for electronic equipment and the connection terminal of the present invention protrudes integrally from the main body so as to have a main body made of a copper-based material and an insertion hole, and protrudes into a cylindrical shape. In addition, it has a cylindrical protrusion having a tip-side melted portion on the protruding tip side. The number of the cylindrical protrusions is not particularly limited, and may be single or plural, and is appropriately set according to the number of connection terminals to be welded.

  In this bus bar for electronic equipment, a main body part and one or a plurality of cylindrical projection parts are integrally formed from a copper-based material such as a flat plate shape by press working or the like. The copper-based material is not particularly limited, and a copper alloy such as copper or brass can be used.

  In this electronic device bus bar, each connection terminal of one or a plurality of electronic components is joined to each cylindrical projection. The type of the electronic component, the material of the connection terminal, and the wire diameter are not particularly limited, and a connection terminal made of a copper-based material or an iron-based material can be joined.

  The cylindrical protruding portion is integrally raised so as to have an insertion hole from a predetermined position of the main body portion, and protrudes into a cylindrical shape having a predetermined protruding height and thickness. As described above, in the bus bar for electronic equipment according to the present invention having one or a plurality of cylindrical protrusions, the front-side melted part of the cylindrical protrusions in a state where the connection terminals of the single or a plurality of electronic components are inserted into the insertion holes. Is melted by a high energy density heating source to weld the cylindrical projection and the connection terminal.

  The insertion hole of the cylindrical protrusion has a predetermined gap between the inner peripheral surface of the cylindrical protrusion and the outer peripheral surface of the connection terminal according to the wire diameter of the connection terminal that is inserted into the insertion hole and joined. It is formed with a predetermined hole diameter so that it can be formed. That is, the insertion hole is made of a molten metal having a hole diameter larger than the wire diameter of the connection terminal by a predetermined amount so that the connection terminal can be easily inserted, and a molten portion in which the molten portion at the tip side of the cylindrical projection is heated and melted. The hole diameter is set such that the gap can be appropriately filled and desired bonding strength can be exhibited. In addition, if the gap is relatively large with respect to the amount of molten metal heated and melted by the molten portion at the distal end side of the cylindrical protrusion, the gap cannot be filled with molten metal, so that the desired bonding strength can be obtained. Can't get.

  Here, the cylindrical projection has a minimum gap between the cylindrical projection and the connection terminal after the connection terminal is inserted into the insertion hole and before the tip melting portion is melted. It is preferable that the minimum gap at the position is set to be 0.05 to 0.4 mm, and more preferable to be set to be 0.05 to 0.2 mm. The gap between the cylindrical projection and the connection terminal is a gap on one side between the cylindrical projection and the connection terminal when the connection terminal is inserted in the center of the insertion hole of the cylindrical projection. Means. If the minimum gap between the cylindrical projection and the connection terminal inserted into the insertion hole is set within the predetermined range, the gap between the cylindrical projection and the connection terminal is set to the same cylindrical projection. It is possible to reliably obtain the desired bonding strength by appropriately filling the molten portion of the tip side with the molten metal heated and melted. Further, if the minimum gap between the cylindrical projection and the connection terminal is set within the predetermined range, the gap between the cylindrical projection and the connection terminal is caused by the molten metal that is heated and melted at the distal end side melting portion. As a result, the appropriate range of the amount of heat input from the heating source suitable for obtaining the desired bonding strength to the front end side melted portion is expanded, and the productivity is improved. If the gap between the cylindrical projection and the connection terminal is too large, molten metal may be burned out due to the connection terminal being biased in the insertion hole, or the gap may be filled appropriately due to insufficient molten metal. This makes it difficult to generate a bonding failure. On the other hand, if the gap between the cylindrical projection and the connection terminal is too small, the insertion property of the connection terminal into the insertion hole of the cylindrical projection will be lowered, and the molten metal will flow down in the gap due to capillary action. There is a tendency to cause poor bonding.

In the bus bar for electronic equipment according to the joining structure of the bus bar for electronic equipment and the connection terminal of the present invention, the material of the connection terminal is such that the joint strength between the cylindrical projection and the connection terminal to be welded is not less than a predetermined value. And the length of a front end side fusion | melting part is each adjusted by respectively adjusting protrusion height according to a wire diameter. If the wire diameter of the connection terminal joined to the cylindrical protrusion increases, the joint strength required for the joint also increases accordingly. For this reason, if the wire diameter of the connecting terminal to be joined is increased, the protruding height of the cylindrical protrusion is set higher accordingly, and the length of the distal end side melted portion is set longer. Moreover, when the material of the connection terminal to be joined and the material of the bus bar for electronic equipment are different, it is difficult to weld compared to the case of the same type. For this reason, when the material of the connection terminal to be joined and the material of the bus bar for electronic equipment are different, the protruding height of the cylindrical protrusion is set higher than that of the same type, and the tip side melts. The length of the part is set longer.

  Here, if the thickness of the cylindrical projection is too thick, it becomes difficult to heat and melt the molten portion on the tip side of this cylindrical projection, while if it is too thin, it is inserted into the insertion hole of this cylindrical projection. It becomes difficult to obtain a desired joint strength by appropriately filling the gap between the formed connection terminal and the cylindrical projection with the molten metal melted by the melted portion on the tip side. For this reason, the thickness of the cylindrical projection is such that the gap between the cylindrical projection and the connection terminal inserted into the insertion hole is caused by the molten metal melted by the molten portion at the distal end side of the cylindrical projection. It is adjusted so that it can be appropriately filled to obtain a desired bonding strength, and the distal end side melted portion can be reliably heated and melted. At this time, the larger the amount of melting (amount of molten metal) of the cylindrical projection heated / melted by the heating source, in other words, the longer the length of the tip-side molten portion heated / melted by the heating source, the larger the bonding area. If it is large, the joint strength at the joint becomes high. For this reason, if the length of the front end side melted part is adjusted appropriately, an appropriate joint area can be secured at the joint part between the cylindrical projection and the front end side melted part, and therefore a desired joint strength can be obtained. Can be obtained.

The electronic device bus bar according to the present invention constructed as described above has a connection terminal inserted into the insertion hole of the cylindrical protrusion, and the electronic device bus bar has a connection structure with the connection terminal. The cylindrical protrusion and the connection terminal are welded by preferentially heating and melting the front end side melting portion of the cylindrical protrusion. At this time, as a heating source for heating and melting the tip side melting portion of the cylindrical projection, a high energy density heating source capable of reliably heating and melting each tip side melting portion of each cylindrical projection is used. There is no particular limitation as long as it is present, and laser, plasma, or TIG can be used. However, it is preferable to use laser irradiation from the viewpoint of improving productivity and downsizing of equipment.

  When heating and melting the tip-side melted portion of the cylindrical projection using laser irradiation, the tip-side melted portion of the cylindrical projection can be reliably heated and melted by laser irradiation without excess or deficiency. As described above, the irradiation condition of the laser beam is set appropriately in advance according to the length and thickness of each tip side melted portion of each cylindrical projection. It should be noted that excessive melting of the front end side melted portion by laser light irradiation is allowed within a range in which a desired bonding strength can be obtained.

  In addition, it is preferable that the laser beam is vertically irradiated along the protruding direction of the cylindrical projecting portion toward the tip side melted portion of the cylindrical projecting portion. This is because the energy density of the laser beam can be effectively used for heating and melting the tip side melted portion, and spattering of the connection terminal made of an iron-based material can be suppressed.

In the bus bar for electronic equipment according to the joint structure of the bus bar for electronic equipment and the connection terminal of the present invention , the cylindrical protrusion is provided integrally with the tip-side melted part melted by the heating source, and the tip-side melted part, A proximal end holding portion capable of holding the connection terminal inserted into the insertion hole and capable of holding the connection terminal inserted into the insertion hole even when the distal end side melted portion is melted. . When setting the connection terminal to the bus bar for electronic equipment, the connection terminal is inserted into the insertion hole of the cylindrical projection, and the connection terminal is held by the proximal end holding portion of the cylindrical projection, and the The front end surface of the connection terminal is positioned in the vicinity of the front end side melted portion of the cylindrical projection. At this time, it is preferable that the front end surface of the connection terminal does not protrude beyond the projecting front end surface of the cylindrical projection (projection front end surface of the front end side melted portion), and the front end surface of the connection terminal is the projecting front end surface of the cylindrical projection. More preferably, it is set at a lower position. If it carries out like this, it will become easy to preferentially heat and fuse the tip side fusion part of a cylindrical projection part rather than a connection terminal by irradiation of a laser beam in a joining process. In addition, since it becomes difficult to irradiate the distal end surface of the connection terminal with the laser beam irradiated toward the distal end side melting portion, the energy of the laser beam irradiated for heating and melting the distal end side melting portion is changed to the distal end side. It can be used efficiently for heating and melting the melting portion, and it is possible to suppress the occurrence of spatter when the connection terminal is made of an iron-based material. Therefore, when the connection terminal is an iron-based material, in order to suppress the occurrence of spatter, in the setting process, the front end surface of the connection terminal is more than the projecting front end surface of the cylindrical projection (the projecting front end surface of the front end side melting portion). It is preferable that it does not protrude, and it is more preferable that the front end surface of the connection terminal is set at a position lower than the protruding front end surface of the cylindrical protrusion.

As the cylindrical protrusion having such a base end side holding part, a divided body divided into at least two parts by at least two slits extending along the protruding direction of the cylindrical protrusion with a spacing in the circumferential direction. Each of the divided bodies is provided integrally with the front end side melted portion melted by the heating source and the front end side melted portion, and the connection terminal is inserted into the insertion hole to thereby each divided body. There through the elastic force generated by the elastic deformation in the centrifugal direction, it is assumed that the insertion hole in the inserted and the connection terminal capable of holding the proximal-side holding section respectively have. The number of dividing the cylindrical protrusion (number of divided bodies) is not particularly limited, and can be divided into two, three, four,. Each of the divided bodies has a flange portion that is integrally extended in the centripetal direction from the projecting tip of the divided body so as to block a part of the insertion hole and constitutes a part of the distal end side melted portion. It is preferable. This flange can contact the tip of the connection terminal inserted into the insertion hole, and the contact with the tip of the connection terminal inserted into the insertion hole restricts further insertion of the connection terminal. To do.

Hereinafter, specific examples and reference examples of the joining structure of a bus bar for electrical equipment and a connection terminal and a joining method of the connection terminal to the bus bar for electrical equipment according to the present invention will be described with reference to the drawings.

( Reference Example 1 )
This reference example is a form that serves as a reference for the present invention .

  As shown in FIGS. 1 and 2, the electronic device bus bar 1 has a main body 2 made of copper and first to third insertion holes 3A to 3C (only 3A is shown in FIG. 2). The six first parts which protrude integrally from the main body part 2 and protrude in a tapered cylindrical shape and have first to third front end side melting parts 4A to 4C (only 4A shown in FIG. 2) are provided on the front end side of each protrusion. 1st-3rd cylindrical projection part 5A-5C. This bus bar 1 for electronic devices is formed by integrally forming a main body 2 and six first to third cylindrical protrusions 5A to 5C by drawing a copper plate.

The basic shapes of the six first to third cylindrical protrusions 5A to 5C are all the same, and each cylindrical protrusion 5A to 5C closes the first to third insertion holes 3A to 3C. The first to third top portions 10A that are integrally provided at the projecting tips of the first to third cylindrical projections 5A to 5C and constitute a part of the first to third tip-side melted portions 4A to 4C. 10C. The first to third top portions 10A to 10C can be brought into contact with distal end surfaces of first to third connection terminals, which will be described later, inserted into the first to third insertion holes 3A to 3C.

  The six first to third cylindrical protrusions 5A to 5C are two, and there are three pairs, and the first cylindrical protrusions 5A and 5A forming the first set form the second set. The second cylindrical projecting portions 5B and 5B and the third set of third cylindrical projecting portions 5C and 5C are provided. In addition, a pair of cylindrical projection part which comprises each group has the same shape and magnitude | size (a hole diameter, a protrusion height, thickness, etc. of an insertion hole), respectively. A pair of first connection terminals 7A and 7A extending from the first electronic component (diode) A are joined to the first cylindrical protrusions 5A and 5A forming the first set, respectively. A pair of second connection terminals 7B and 7B extending from the second electronic component (capacitor) B are joined to the second cylindrical protrusions 5B and 5B forming the second set, respectively. A pair of third connection terminals 7C and 7C extending from the third electronic component (coil) C are joined to the third cylindrical protrusions 5C and 5C forming the third set, respectively.

  Here, the first connection terminals 7A and 7A are made of copper and have a wire diameter of φ1.2 mm. The first cylindrical protrusions 5A and 5A to which the first connection terminals 7A and 7A are respectively joined have a minimum hole diameter (hole diameter at the upper end position of the first insertion hole 3A) of the first insertion holes 3A and 3A. The diameter is φ1.4 mm, which is a predetermined amount larger than the wire diameter of the first connection terminal 7A. That is, the minimum gap (the upper end position of the first insertion hole 3A) between the first cylindrical protrusion 5A and the first connection terminal 7A in a state where the first connection terminal 7A is inserted in the center of the first insertion hole 3A. (One-side clearance at the protruding tip position of the first cylindrical protrusion 5A) is 0.1 mm. The protruding heights of the first cylindrical protrusions 5A and 5A are 2 mm, and the lengths of the first tip side melted parts 4A and 4A of the first cylindrical protrusions 5A and 5A are 2 mm. Yes. The thickness of the first cylindrical projections 5A and 5A is such that the first cylindrical projections 5A and the first insertion holes are made of molten metal obtained by melting the first tip side melted part 4A of the first cylindrical projections 5A. The gap between the first connecting terminal 7A inserted in 3A can be appropriately filled to obtain a desired bonding strength, and the first tip side melted portion 4A can be reliably heated and bonded in a bonding process described later. It is adjusted so that it can be melted.

  The second connection terminals 7B and 7B are made of soft iron and have a wire diameter of φ0.8 mm. The second cylindrical projections 5B and 5B to which the second connection terminals 7B and 7B are respectively joined have a minimum hole diameter (hole diameter at the upper end position of the second insertion hole 3B) of the second insertion holes 3B and 3B. It is set to φ1.0 mm which is a predetermined amount larger than the wire diameter of the second connection terminal 7B. That is, the minimum gap between the second cylindrical projection 5B and the second connection terminal 7B in the state where the second connection terminal 7B is inserted at the center of the second insertion hole 3B (the upper end position of the second insertion hole 3B). (One-side clearance at the protruding tip position of the second cylindrical protrusion 5B) is 0.1 mm. The thickness of the second cylindrical projections 5B and 5B is such that the second cylindrical projection 5B and the second insertion hole are made of molten metal melted by the second tip side molten portion 4B of the second cylindrical projection 5B. The gap between the second connection terminal 7B inserted into the 3B and the second connection terminal 7B can be appropriately filled to obtain a desired bonding strength, and the second tip side melted portion 4B can be reliably heated and bonded in the bonding process described later. It is adjusted so that it can be melted.

  The third connection terminals 7C and 7C are made of copper and have a wire diameter of φ2.4 mm. The third cylindrical projections 5C and 5C to which the third connection terminals 7C and 7C are joined respectively have the minimum hole diameters (hole diameters at the upper end position of the third insertion hole 3) of the third insertion holes 3C and 3C. The diameter is 2.6 mm, which is a predetermined amount larger than the wire diameter of the third connection terminal 7C. That is, the minimum gap (the upper end position of the third insertion hole 3C) between the third cylindrical protrusion 5C and the third connection terminal 7C in a state where the third connection terminal 7C is inserted into the center of the third insertion hole 3C. (One-side clearance at the protruding tip position of the third cylindrical protrusion 5C) is 0.1 mm. The thickness of the third cylindrical protrusions 5C and 5C is such that the third cylindrical protrusion 5C and the third insertion hole are formed by the molten metal melted by the third distal end side molten part 4C of the third cylindrical protrusion 5C. A gap between the third connection terminal 7C inserted in the 3C and the third connection terminal 7C can be appropriately filled to obtain a desired bonding strength, and the third tip side melted portion 4C can be reliably heated and bonded in a bonding process described later. It is adjusted so that it can be melted.

  The first to third connection terminals 7A to 7C of the first to third electronic components A to C are joined to the electronic device bus bar 1 having the above-described configuration using laser welding as follows. .

<Set process>
First, the first to third electronic components A to C are held by holding the first to third electronic components A to C on a component holding jig (not shown) with the first to third connection terminals 7A to 7C facing upward. Was arranged at a predetermined position (see FIG. 1). Then, by lowering the electronic device bus bar 1 from above the first to third electronic components A to C, the first to third insertion holes 3A to 3C of the first to third cylindrical protrusions 5A to 5C are changed to the first. The first to third top terminals 10A of the first to third cylindrical protrusions 5A to 5C are inserted into the first to third connection terminals 7A to 7C, respectively, and the tip surfaces of the first to third connection terminals 7A to 7C are inserted. -10C (see FIG. 2).

  In this setting step, since the introduction guide portions 6 are provided on the first to third cylindrical protrusions 5A to 5C, the first to third connection terminals 7A to 7C are provided along the introduction guide portion 6. Since it is guided and inserted into the first to third insertion holes 3A to 3C, the insertion operation becomes easy.

<Joint process>
Then, using a laser irradiation device (not shown), the laser beam 8 is directed toward the first top portion 10A constituting the first tip side melting portion 4A of one first cylindrical projection portion 5A. Vertical irradiation was performed along the protruding direction of 5A (see FIG. 2). By vertically irradiating the first top portion 10A with the laser beam 8, the entire first tip side melting portion 4A is melted, and the tip surface of the first connection terminal 7A is made of molten metal obtained by melting the first tip side melting portion 4A. And the gap between the first cylindrical projection 5A and the first connection terminal 7A is filled, and in this state, the molten metal is solidified to form the brazing portion 9, and the first cylindrical projection 5A The first connection terminal 7A was integrally joined (see FIG. 3). Note that the vertical irradiation of the laser beam 8 did not directly irradiate the tip surface of the first connection terminal 7A. Next, similarly, the other second cylindrical projection 5A and the second connection terminal 7A were integrally joined.

  Similarly, the second cylindrical protrusions 5B and 5B and the second connection terminals 7B and 7B were integrally joined by laser welding. Further, similarly, the third cylindrical protrusions 5C and 5C and the third connection terminals 7C and 7C are integrally joined.

  The laser irradiation device is disposed on the optical axis of the laser oscillator and the laser beam emitted from the laser oscillator, and the focal position, irradiation direction (irradiation angle), irradiation position, etc. of the laser beam can be arbitrarily controlled. A predetermined optical system element is provided with a mirror scanning device.

  Further, the irradiation conditions such as the laser output and the irradiation time during laser welding are such that the entire first tip side melting portions 4A to 4C of the first to third cylindrical projections 5A to 5C are heated and melted without excess or deficiency. It was set beforehand for every 1st-3rd cylindrical projection part 5A-5C so that it could be made.

As described above, in the present reference example , the first to third cylindrical protrusions 5A to 5C are adjusted by adjusting the protruding heights of the first to third connection terminals 7A to 7C in accordance with the material and the wire diameter. -The length of 3rd front end side fusion | melting part 4A-4C is each adjusted. And the 1st-3rd front end side fusion | melting part 4A-4C is reliably preferentially heated and fuse | melted by perpendicular irradiation with respect to the 1st-3rd top part 10A-10C of the laser beam 8. FIG. For this reason, it is possible to ensure appropriate joining areas corresponding to the first to third connection terminals 7A to 7C joined to the first to third cylindrical protrusions 5A to 5C, respectively, and the first to third cylinders. It becomes possible to join the projections 5A to 5C and the first to third connection terminals 7A to 7C with a desired joining strength.

Therefore, according to this reference example , in order to ensure the joining property on the joining terminal side without employing different welding methods (welding machines) depending on the first to third connection terminals 7A to 7C to be joined. The first to third connection terminals 7A to 7C and the first to third cylindrical protrusions 5A to 5C having different wire diameters and materials can be satisfactorily joined without separately providing the conventional rod-like protrusions. Can do.

Moreover, in this reference example , since the 1st-3rd cylindrical projection parts 5A-5C have the 1st-3rd top parts 10A-10C, respectively, it is only a 1st-3rd insertion hole by a setting process. The first to third connection terminals 7A to 7C are inserted into 3A to 3C, and the insertion operation is performed until the tip surfaces of the first to third connection terminals 7A to 7C abut on the first to third top portions 10A to 10C. The first to third connection terminals 7A to 7C are accurately positioned in the height direction with respect to the first to third cylindrical protrusions 5A to 5C of the bus bar 1 for electronic devices by an extremely simple method. Easy to set. Therefore, in the joining step, the molten metals that contribute to welding by heating and melting the first to third tip side melting portions 4A to 4C of the first to third cylindrical protrusions 5A to 5C are the first to third. Since it is stably supplied to the gap between the cylindrical projections 5A to 5C and the first to third connection terminals 7A to 7C, the first to third cylindrical projections 5A to 5C and the first to third The connection terminals 7A to 7C can be well welded through solidification of the molten metal.

  Further, when the first to third tip side melting portions 4A to 4C of the first to third cylindrical projections 5A to 5C are heated and melted by the laser beam 8 in the joining step, the first to third connections are performed. The first to third apexes 10A to 10C block the direct irradiation of the laser light 8 onto the terminals 7A to 7C. Therefore, it is not directly heated by the heating source. Therefore, the first to third tip side melting portions 4A to 4C can be heated and melted while efficiently using the energy of the laser beam 8, and the first to third connection terminals 7A to 7C are made of iron. It is possible to effectively suppress the occurrence of spatter when the material is used.

In addition, in this reference example , since the minimum gap between the first to third cylindrical protrusions 5A to 5C and the first to third connection terminals 7A to 7C is set within a predetermined range, the first ~ The gap between the first to third cylindrical projections 5A to 5C and the first to third connection terminals 7A to 7C is appropriately made of molten metal in which the third tip side melting parts 4A to 4C are heated and melted. The desired bonding strength can be reliably obtained by filling.

( Reference Example 2 )
This reference example is another embodiment that is a reference of the present invention .

In this reference example , as shown in FIG. 4, first to first described later in a state of being inserted into the first to third insertion holes 3 </ b> A to 3 </ b> C at the center of the first to third top portions 10 </ b> A to 10 </ b> C. First to third confirmation holes 11 </ b> A to 11 </ b> C (only 11 </ b> A are shown in FIG. 4) through which the front end surfaces of the three connection terminals can be confirmed are penetrated.

In this reference example , in the setting step, the first to third connection terminals 7A to 7C are inserted into the first to third insertion holes 3A to 3C of the first to third cylindrical protrusions 5A to 5C, respectively. After the respective front end surfaces of the first to third connection terminals 7A to 7C are brought into contact with the first to third top portions 10A to 10C of the first to third cylindrical projections 5A to 5C, respectively, the following confirmation process Carried out.

<Confirmation process>
The first to third top portions with the first to third connection terminals 7A to 7C inserted and set in the first to third insertion holes 3A to 3C of the first to third cylindrical protrusions 5A to 5C. Through the first to third confirmation holes 11A to 11C provided in 10A to 10C, the front end surfaces of the first to third connection terminals 7A to 7C were confirmed with a CCD camera or a laser sensor.

Therefore, in this reference example , the insertion state of the first to third connection terminals 7A to 7C with respect to the first to third insertion holes 3A to 3C can be surely grasped after the setting step. When the first to third distal end side melting portions 4A to 4C are heated and melted by the laser light 8, the irradiation conditions can be set according to the insertion states of the first to third connection terminals 7A to 7C. Therefore, the amount of molten metal contributing to welding can be reliably ensured, and the first to third cylindrical protrusions 5A to 5C and the first to third connection terminals 7A to 7C can be welded more favorably. It becomes possible. Further, since the insertion abnormality of the first to third connection terminals 7A to 7C with respect to the first to third insertion holes 3A to 3C can be confirmed in advance, the first to third connection terminals 7A to 7C can be set again. Thus, it is possible to prevent the occurrence of poor bonding in advance.

Other configurations and operational effects are the same as those in Reference Example 1 .

( Example 1 )
This embodiment embodies the invention according to claim 1, 3 or 5 .

  That is, in this embodiment, as shown in FIG. 5, the first cylindrical protrusion 5A extends along the protruding direction of the first cylindrical protrusion 5A at equal intervals of 180 ° in the circumferential direction. The first divided body 12a and the second divided body 12b divided into two by the slits of the first and second divided bodies 12a and 12b are respectively connected to the front end side melting portions 13a and 13b heated and melted by the laser beam 8. The first and second divided bodies 12a and 12b are elastically deformed in the centrifugal direction by being provided integrally with the distal end side melting portions 13a and 13b and the first connection terminal 7A being inserted into the first insertion hole 3A. Each has a base end side holding portion 14a and 14b capable of holding the first connection terminal 7A inserted into the first insertion hole 3A via the elastic force generated by the above.

  The first cylindrical protrusion 5A composed of the first and second divided bodies 12a and 12b is provided with two slits arranged in series on the copper plate at a predetermined interval, and a rod-like object is aimed at the center of each slit. It was manufactured by pushing up from the bottom to make it bulge into a predetermined shape, and finally punching the center head with a press to penetrate.

  The second and third cylindrical projections 5B and 5C also have the same basic configuration as the first cylindrical projection 5A, and have the same operational effects as the first cylindrical projection 5A.

Therefore, in this embodiment, when the first connection terminal 7A is inserted into the first insertion hole 3A of the first cylindrical protrusion 5A in the setting step, the first and the first connection terminals 7A are inserted along with the insertion of the first connection terminal 7A. The two split bodies 12a and 12b are elastically deformed in the centrifugal direction, respectively, and an elastic force is generated. The first connection terminals 7A inserted into the first insertion holes 3A are connected to the base end side holding portions 14a and 14a via the elastic force. 14b is held in a tensioned state, thereby restricting further insertion of the first connection terminal 7A (see FIG. 6). That is, the first connection terminal 7A inserted into the first insertion hole 3A has an elastic force on the base end side holding portions 14a and 14b of the first and second divided bodies 12a and 12b constituting the first cylindrical protrusion 5A. The first connecting terminal 7A is accurately positioned in the height direction and the lateral direction with respect to the first cylindrical protrusion 5A. Therefore, the first connection terminal 7A is simply inserted into the first insertion hole 3A of the first cylindrical protrusion 5A, and the insertion operation is performed by the first connection terminal 7A at the base ends of the first and second divided bodies 12a and 12b. The first cylindrical protrusion 5A of the electronic device bus bar 1 is accurately positioned in the height direction and the lateral direction by a very simple method of performing until it is held by the side holding portions 14a and 14b. One connection terminal 7A can be easily set. Therefore, it becomes possible to favorably weld the first cylindrical protrusion 5A and the first connection terminal 7A in the joining step.

  Further, when the first connection terminal 7A is inserted into the first insertion hole 3A of the first cylindrical protrusion 5A, the first and second divided bodies 12a and 12b are elastically deformed in the centrifugal direction, so that the insertion work is performed. It becomes easy. If the first and second divided bodies 12a and 12b are elastically deformed in the centrifugal direction as the first connection terminal 7A is inserted into the first insertion hole 3A, it is confirmed by a CCD camera or a laser sensor. Therefore, it is possible to reliably grasp the insertion state of the first connection terminal 7A into the first insertion hole 3A by the amount of elastic deformation in the centrifugal direction of the first and second divided bodies 12a and 12b. In the state where the first connection terminal 7A is inserted into the first insertion hole 3A, a confirmation gap 15 is formed between the protruding tip of the first divided body 12a and the protruding tip of the second divided body 12b. Therefore, the insertion state of the first connection terminal 7A into the first insertion hole 3A may be confirmed through the confirmation gap 15.

  For this reason, when the front end side melting portions 13a and 13b are heated and melted by the laser beam 8, it is possible to set the irradiation condition according to the insertion state of the first connection terminal 7A. Therefore, the amount of molten metal that contributes to welding can be reliably ensured, and the first cylindrical protrusion 5A and the first connection terminal 7A can be welded better. In addition, since it is possible to confirm in advance the search abnormality of the first connection terminal 7A with respect to the first insertion hole 3A, it is possible to prevent the occurrence of poor bonding by re-setting the first connection terminal 7A. It becomes possible.

  Furthermore, the base end side holding portions 14a and 14b of the first and second divided bodies 12a and 12b constituting the first cylindrical projection portion 5A are first in the state where the tip end side melting portions 13a and 13b are melted. Since the first connection terminal 7A inserted into the insertion hole 3A can be held, the first connection terminal 7A is accurately positioned in the height direction and the lateral direction with respect to the first cylindrical protrusion 5A. One cylindrical projection 5A and the first connection terminal 7A can be welded, and better welding is possible.

Other configurations and operational effects are the same as those in Reference Example 1 .

( Example 2 )
The present embodiment embodies the invention according to claim 2, 4 or 5 .

That is, in the present embodiment, as shown in FIG. 7, in the first cylindrical protrusion 5A, the first and second divided bodies 12a and 12b are formed so as to block a part of the first insertion hole 3A. The first and second divided bodies 12a and 12b respectively have flange portions 16a and 16b that extend integrally from the projecting tips of the first and second divided bodies 12a and 12b in the centripetal direction and constitute part of the tip-side melted portions 13a and 13b. . Each flange part 16a and 16b was formed by bending the protrusion front end side of 5 A of 1st cylindrical projection parts of the said Example 1 inside.

Before the first connection terminal 7A is inserted into the first insertion hole 3A, the gap between the flange portions 16a and 16b is almost equal to zero, and the inner (centripetal side) end face of the flange portion 16a and the flange It has become almost a contact state and the inner (centripetal side) end surface of the part 16b. And the clearance gap 15 for a confirmation is formed between the inner side end surface of the flange part 16a, and the inner side end surface of the flange part 16b in the state after the 1st connecting terminal 7A was inserted in 3A of 1st insertion holes.

  The second and third cylindrical projections 5B and 5C also have the same basic configuration as the first cylindrical projection 5A, and have the same operational effects as the first cylindrical projection 5A.

  In this bus bar 1 for electronic equipment, the projecting tip side of the first cylindrical projecting portion 5A is provided by the flange portions 16a and 16b integrally extending in the centripetal direction from the projecting tips of the first and second divided bodies 12a and 12b. The opening of the first insertion hole 3A is partially blocked. For this reason, the first connection terminal 7A inserted into the first insertion hole 3A of the first cylindrical protrusion 5A is restricted from being inserted further by the front end surface contacting the flange portions 16a and 16b. The That is, the height of the first connection terminal 7A with respect to the first cylindrical protrusion 5A by the front end surface of the first connection terminal 7A coming into contact with the flange portions 16a and 16b of the first and second divided bodies 12a and 12b. Positioning in the direction is performed accurately. Therefore, the first connection terminal 7A is simply inserted into the first insertion hole 3A of the first cylindrical protrusion 5A, and the insertion operation is performed with the tip surface of the first connection terminal 7A being the first and second divided bodies 12a and 12b. The first connecting terminal 7A is accurately positioned in the height direction with respect to the first cylindrical projection 5A of the bus bar 1 for electronic equipment by a very simple method of performing until the flanges 16a and 16b come into contact with each other. Can be set easily. Therefore, the first cylindrical protrusion 5A and the first connection terminal 7A can be favorably welded.

  Moreover, since each flange part 16a and 16b of the 1st and 2nd division bodies 12a and 12b partially block | closes the 1st insertion hole 3A, each front end side fusion | melting part of the 1st and 2nd division bodies 12a and 12b When the 13a and 13b are heated and melted by the laser beam 8, the first connecting terminal 7A inserted into the first insertion hole 3A is directly heated by the laser beam 8 by the flange portions 16a and 156. Limited. For this reason, even when the first connection terminal 7A is made of an iron-based material, the occurrence of sputtering can be effectively suppressed.

Other configurations and operational effects are the same as those of the first embodiment .

It is explanatory drawing which relates to the reference example 1, and demonstrates typically a mode that the connection terminal of an electronic component is set to the cylindrical projection part of the bus bar for electronic devices, and laser welding is performed. It is a fragmentary sectional view which shows typically a mode that it concerns on the reference example 1 , and is performing laser welding at a joining process. It is a fragmentary sectional view which shows typically the mode after performing laser welding by the joining process concerning the reference example 1. FIG. It is a fragmentary sectional view which shows typically a mode that it concerns on the reference example 2 , and is performing laser welding at a joining process. FIG. 6 is a partial cross-sectional view schematically showing a state before the connection terminal is inserted into the insertion hole of the cylindrical protrusion in the setting step according to the first embodiment of the present invention. FIG. 6 is a partial cross-sectional view schematically showing a state after the connection terminal is inserted into the insertion hole of the cylindrical protrusion in the setting step according to the first embodiment of the present invention. FIG. 10 is a partial cross-sectional view schematically showing a state after the connection terminal is inserted into the insertion hole of the cylindrical protrusion in the setting step according to the second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic equipment bus bar 2 ... Main-body part 3A-3C ... 1st-3rd insertion hole 4A-4C ... 1st-3rd front end side fusion | melting part 5A-5C ... 1st-3rd cylindrical projection part 7A-7C ... 1st-3rd connection terminal AC ... 1st-3rd electronic component 8 ... Laser beam 10A-10C ... 1st-3rd top part 11A-11C ... 1st-3rd confirmation hole 12a, 12b ... 1st DESCRIPTION OF SYMBOLS 1, 2nd division body 13a, 13b ... Front end side fusion | melting part 14a, 14b ... Base end side holding part 15 ... Clearance gap 16a, 16b ... Flange part

Claims (5)

It has a main body made of a copper-based material and a cylindrical protrusion having a protruding portion that protrudes integrally from the main body so as to have an insertion hole, and has a front end-side melted portion on the protruding tip side. in a state in which the terminal is inserted into said insertion hole, connected to the electronic equipment bus bar distal-end-side molten bond and a cylindrical protrusion by being melted and the connection terminals are welded by the heat source of the high energy density A junction structure of terminals ,
The cylindrical protrusion is composed of a divided body divided into at least two parts by at least two slits extending along the protruding direction of the cylindrical protrusion with an interval in the circumferential direction.
Each of the divided bodies is provided integrally with the distal end side melting portion melted by the heating source and the distal end side melting portion, and each of the divided bodies is centrifuged by inserting the connection terminal into the insertion hole. The connection terminal inserted in the insertion hole can be held through the elastic force generated by elastic deformation in the direction and the connection terminal inserted into the insertion hole can be held and the tip side melted portion is melted. A joining structure of a bus bar for electronic equipment and a connection terminal, each having a base end side holding portion capable of holding a terminal . Each of the divided bodies has a flange portion that is integrally extended in the centripetal direction from the protruding tip of the divided body so as to block a part of the insertion hole and constitutes a part of the tip-side melted portion. The joint structure of the bus bar for electronic devices and a connection terminal of Claim 1 characterized by the above-mentioned. It has a main body made of a copper-based material and a cylindrical protrusion having a protruding portion that protrudes integrally from the main body so as to have an insertion hole, and has a front end-side melted portion on the protruding tip side. in a state where the terminal is inserted into the insertion hole, the tip-side molten bond is to electronics bus bars and the said connection terminal tubular projections are welded by being melted by the heat source of the high energy density A connection terminal joining method ,
The cylindrical protrusion is composed of a divided body divided into at least two parts by at least two slits extending along the protruding direction of the cylindrical protrusion with an interval in the circumferential direction.
Each of the divided bodies has the distal end side melted portion melted by the heating source and a proximal end side holding portion provided integrally with the distal end side melted portion,
The connection terminals inserted into the insertion holes are inserted into the insertion holes of the cylindrical protrusions through elastic forces generated by elastically deforming the divided bodies in the centrifugal direction by inserting the connection terminals into the insertion holes. A holding step of holding the base end side holding portion, and setting the tip end surface of the connection terminal in the vicinity of the tip end side melting portion of each of the divided bodies,
By irradiating a laser beam as the heating source toward each distal end side fusion portion of each divided body, the connection terminal is applied to each proximal end holding portion of each divided body via the elastic force. A method of joining a connection terminal to a bus bar for electronic equipment, comprising: a joining step of joining each of the cylindrical projections and the connection terminal by melting each tip side melted part while holding . Each of the divided bodies has a flange portion that is integrally extended in the centripetal direction from the protruding tip of the divided body so as to block a part of the insertion hole and constitutes a part of the tip-side melted portion. And
Wherein in the setting step, a joining method for connecting terminals of said front end surface of the connection terminal to the electronic device for busbar according to claim 3, wherein Rukoto brought into contact with each said flange portion of each said divided body. In the joining step, toward the front-end-side molten bond of the tubular projections, according to claim 3 or 4, wherein that you vertically irradiated along the laser beam in a protruding direction of the tubular projecting portion Method of connecting terminal to bus bar for electronic equipment.

Images