JPH02148795A - Connecting method for lead of hybrid module - Google Patents

Abstract

PURPOSE:To desirably connect a lead without junction peeling by a thermal stress, etc. by welding or soldering the lead in a state for mechanically holding it at the connection part of an external connection terminal. CONSTITUTION:The end of an external connection terminal 8 is previously bent in an enclosure 4, and the other end of a lead 6 connected to a hybrid circuit 2 is held and supported. The holding part is held by a pair of welding electrodes 9a, 9b used also as pressers, and welded. Thus, the connection of the terminal 8 to the body can be effectively and stably conducted to improve its reliability and yield.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a lead connection method for a hybrid module, and particularly relates to a lead connection method for a hybrid module, and in particular, a method for connecting leads to an external connection terminal provided in an envelope and The present invention relates to an improvement in a method of connecting a lead wire whose one end is electrically connected to an internal hybrid circuit body.

(Prior art) For example, a required hybrid circuit body is disposed on a base plate, one end of a resin cylindrical body is adhered to the base plate so as to surround the hybrid circuit body, and the required lead connections are made. A C/R grid module is known which has a structure in which the open end of the cylindrical body is sealed with a lid after the cylindrical body is heated.

That is, as shown in perspective in FIG. 4, an IC
While the hybrid circuit main body 2 on which the element 1 and the like are mounted is arranged on the base plate 3, a wall of the cylindrical body 4a forming a part of the envelope 4 arranged so as to surround the hybrid circuit main body 2 is preliminarily installed. The external connection terminal 5 which is inserted through and arranged through the hybrid circuit main body 2 and the lead terminal (lead wire) 6 whose one end is electrically connected to the hybrid circuit main body 2 are integrated and electrically connected, for example, by soldering or welding. After that, a necessary lid (not shown) forming a part of the envelope 4 is provided and sealed, and a hybrid module is put into practical use.

By the way, the connection between the external connection terminal 5 and the lead wire 6 of the hybrid circuit main body 2 in this type of hybrid module is performed as follows. That is, one end is connected to the hybrid circuit main body 2 so that it can come into contact with the surface of the plate-shaped external connection terminal 5 that is inserted through the wall of the cylindrical body 4a that forms a part of the envelope 4. The tip side of the lead wire 6 is bent in advance, the external connection terminal 5 and the tip side of the lead wire 6 are aligned, and the aligned portion is sandwiched between, for example, welding electrodes 7 and subjected to the necessary welding process or They are joined together by soldering and electrically connected. FIG. 5 is a partially cutaway sectional view schematically showing the state of welding the external connection terminal 5 and the lead wire 6. As shown in FIG.

(Problem to be Solved by the Invention) However, when the leads are connected by welding or the like with the tips of the external connection terminal 5 and the lead wire 6 facing each other, the following inconveniences are often observed. It will be done.

That is, a hybrid module constructed using the lead connection method described above can be heated to -50°C and 150°C, for example.
When placed in a temperature cycle environment of low and high temperatures, the solder may deteriorate due to the difference in thermal expansion between the external connection terminal 5 and the lead terminal (lead wire) 6, or the thermal expansion of the resin envelope 4 and the lead wire 6 may occur. The difference causes stress in the solder, which leads to deterioration of the solder and often causes peeling of the joint. On the other hand, in the case of welded joints, the joint surface is relatively small, so the mechanical strength is inferior to that of boat fishing, and the joint is prone to fracture (and sometimes the joint is insufficient, making it even more disadvantageous against thermal stress). This poses a problem in terms of reliability.

[Structure of the Invention] (Means for Solving the Problems) The present invention has been made in view of the above circumstances, and provides a method for connecting the lead wires of the hybrid circuit body internally sealed within the envelope with the lead wires inside the envelope. Therefore, special consideration was given to the structure of the external connection terminal inserted through the wall of the envelope, and the external The connection part of the connection terminal is formed by welding or semi-welding with the lead wire mechanically clamped.
It makes the necessary connections.

(Function) As described above, according to the method of the present invention, the lead wire is mechanically clamped by the external connection terminal, and while being temporarily fixed (connected) by this clamping, the lead wire can be further fixed (connected) as required by welding or soldering. connection is made. In other words, the external connection terminal and the lead wire are doubly connected and integrated by mechanical connection and welding or soldering. Therefore, even if the welded area or solder deteriorates due to thermal stress or the like, the required electrical connection can be maintained without bond peeling or the like.

(Example) The present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 shows an external connection terminal 8 inserted through the wall of a resin envelope 4 forming a part of the hybrid module, and input/output of the hybrid circuit main body 2 disposed inside the envelope 4. This is a perspective view showing a state in which a lead wire 6 whose one end is connected to the terminal 2a is in contact with the terminal 2a. That is, in the method of the present invention, the tip side of the external connection terminal 8 protruding into the envelope 4 is bent to form a structure or shape in which the lead wire 6 is clamped. That is, the tip of the external connection terminal 8 is connected to a lead wire 6 whose one end is electrically connected to the hybrid circuit main body 2 in the envelope 4.
The other end is bent in advance so that it can be supported by pinching. On the other hand, the hybrid circuit main body 2 disposed within the envelope 4
The lead wire 6 to be connected to the external connection terminal 8 is formed by bending or the like as appropriate so that its tip side is held by the lead wire 6 holding part (bending part) of the external connection terminal 8.
It is clamped at the clamping part (bending part). After the lead wire 6 is sandwiched between the external connection terminals 8 in this way, a pair of welding electrodes 9 which also serve as a suppressor are inserted as shown in the top view in FIG.
A and 9b sandwich the sandwiching portion and perform the necessary welding work. In this welding work, instead of using the welding electrodes 9a and 9b as pressing bodies (pressing bodies), a separate suppressing body (pressing body) may be installed.

In the above embodiment, the tip side of the external connection terminal 8 is bent so that the lead wire 6 can be held, but for example, as shown in perspective in FIGS. 3(A) and 3(B), Alternatively, a plurality of cuts may be made on the tip side of the external connection terminal 8 and adjacent sections may be bent alternately so that the lead wire 6 can be held therebetween. Therefore, secondary bonding (connection) after the lead wire 6 is clamped on the tip side of the external connection terminal 8
may be done by soldering instead of welding. Also,
In the method of the present invention, the external connection terminal 8 is, for example, F
The base is made of e, Cu or brass, and the surface is made of Ni, S.
If the lead wire 6 is coated with a plating layer such as solder or solder, the lead wire 6 may be made of Fe or Ni, or may be made of Cu.
It can be applied to any case, such as a case where the substrate is coated with a plating layer as described above.

[Effects of the Invention] As can be seen from the above description, according to the method of the present invention, in the lead connection of a hybrid module, the connection between the external connection terminals and the hybrid circuit body that are connected to each other can be established reliably and stably using the lead wire. The required electrical connections can be made in this state.

In other words, according to the above-mentioned lead connection, thermal stress due to temperature cycles and the like is mostly taken care of by the holding part, and the electrical connection function is reinforced by welding or soldering. The hybrid module configured with the above-mentioned lead connections was tested under temperature cycle conditions between -55°C and 150°C, and the occurrence of breakage or detachment of the lead connections was investigated. It was about 10 times higher than (
In the conventional case, the lead connection part broke or came off after 10,000 to 50,000 cycles). Thus, the method of the present invention can be said to be a swivel connection method that greatly contributes to high stability and reliability in electrical connection of the configured hybrid module, as well as to improvement of yield in mass production.

[Brief explanation of the drawing]

Figures 1 and 3 (^) and (B) are schematic perspective views for explaining the state in which a lead wire, one end of which is connected to the hybrid circuit main body, is clamped and connected at an external connection terminal in the method of the present invention. Figure 2 also shows the method of the present invention,
A top view shows a state in which a lead wire, one end of which connects to the hybrid circuit main body, is clamped and welded by an external connection terminal, Figure 4 is a perspective view showing an example of the internal configuration of a conventional hybrid module, and Figure 5 is a conventional diagram. FIG. 3 is a schematic side view for explaining a lead connection method of the hybrid module. 2... Hybrid circuit body 4... Envelope 6... Lead wire 8... Terminal for external connection Applicant: Toshiba Corporation

Claims (1)

[Scope of Claims] A method for connecting an external connection terminal inserted through an envelope wall and a lead wire whose one end is connected to a hybrid circuit body housed in the envelope, comprising: The tip side of the connection terminal protruding into the envelope is configured to be able to hold the lead terminal, and the other end side of the lead wire, one end of which is connected to the hybrid circuit main body, is held by the tip side of the external connection terminal. A method for connecting leads of a hybrid module, characterized in that the lead terminal clamping portions are electrically connected by welding or soldering.